From eb0c8951196c637e44daf3c0617b131b997d5d2c Mon Sep 17 00:00:00 2001
From: Lena <lena@omega>
Date: Thu, 1 Jan 2026 00:00:00 +0000
Subject: scrcpy-android: mirror an Android device over wireless ADB

Native Java app for Android 12+ that mirrors another Android
device over wireless ADB, forwarding video, audio, touch input,
and clipboard. Bundles a pinned scrcpy-server.jar and the
vendored libadb-android stack. Supports h264/h265/av1 video and
raw/opus audio with in-app codec selection. No NDK, no Kotlin.
Includes JVM unit tests and a Docker-based emulator e2e rig.
---
 app/src/debug/res/layout/mirror.xml                |  93 ++++
 app/src/main/AndroidManifest.xml                   |  49 +++
 app/src/main/assets/scrcpy-server.sha256           |   1 +
 app/src/main/assets/scrcpy-server.version          |   1 +
 app/src/main/java/invalid/lena/scrcpy/Adb.java     | 210 +++++++++
 app/src/main/java/invalid/lena/scrcpy/App.java     |  15 +
 .../main/java/invalid/lena/scrcpy/AtomicFiles.java |  40 ++
 .../main/java/invalid/lena/scrcpy/AudioFrames.java |  18 +
 .../main/java/invalid/lena/scrcpy/AudioSink.java   | 215 ++++++++++
 .../main/java/invalid/lena/scrcpy/AudioStream.java |  93 ++++
 .../java/invalid/lena/scrcpy/ControlMessages.java  |  72 ++++
 .../java/invalid/lena/scrcpy/ControlStream.java    | 154 +++++++
 .../main/java/invalid/lena/scrcpy/Controller.java  | 173 ++++++++
 .../main/java/invalid/lena/scrcpy/Crashlog.java    |  48 +++
 app/src/main/java/invalid/lena/scrcpy/Devices.java | 126 ++++++
 app/src/main/java/invalid/lena/scrcpy/Log.java     |  26 ++
 app/src/main/java/invalid/lena/scrcpy/Main.java    | 150 +++++++
 app/src/main/java/invalid/lena/scrcpy/Mirror.java  | 471 +++++++++++++++++++++
 .../main/java/invalid/lena/scrcpy/MuxRecorder.java | 225 ++++++++++
 app/src/main/java/invalid/lena/scrcpy/Server.java  | 304 +++++++++++++
 app/src/main/java/invalid/lena/scrcpy/Session.java | 318 ++++++++++++++
 .../main/java/invalid/lena/scrcpy/Sessions.java    |  75 ++++
 .../main/java/invalid/lena/scrcpy/Settings.java    |  93 ++++
 .../java/invalid/lena/scrcpy/SettingsActivity.java | 110 +++++
 app/src/main/java/invalid/lena/scrcpy/Sync.java    |  78 ++++
 .../main/java/invalid/lena/scrcpy/VideoFrames.java |  17 +
 .../java/invalid/lena/scrcpy/VideoRecorder.java    |  19 +
 .../main/java/invalid/lena/scrcpy/VideoSink.java   | 244 +++++++++++
 .../main/java/invalid/lena/scrcpy/VideoStream.java | 156 +++++++
 app/src/main/java/invalid/lena/scrcpy/Wire.java    |  99 +++++
 app/src/main/res/drawable/bg_card.xml              |   8 +
 app/src/main/res/drawable/bg_field.xml             |  18 +
 app/src/main/res/drawable/bg_status_pill.xml       |   7 +
 app/src/main/res/drawable/btn_primary.xml          |  11 +
 app/src/main/res/drawable/btn_secondary.xml        |  12 +
 app/src/main/res/drawable/ic_device.xml            |  14 +
 .../main/res/drawable/ic_launcher_background.xml   |   7 +
 .../main/res/drawable/ic_launcher_foreground.xml   |  52 +++
 app/src/main/res/drawable/ic_notification.xml      |  21 +
 app/src/main/res/drawable/ic_settings.xml          |  12 +
 app/src/main/res/layout/device_row.xml             |  28 ++
 app/src/main/res/layout/main.xml                   | 181 ++++++++
 app/src/main/res/layout/mirror.xml                 |  67 +++
 app/src/main/res/layout/settings.xml               | 294 +++++++++++++
 app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml |   6 +
 app/src/main/res/values/colors.xml                 |  16 +
 app/src/main/res/values/dimens.xml                 |  17 +
 app/src/main/res/values/ids.xml                    |  10 +
 app/src/main/res/values/strings.xml                |  36 ++
 app/src/main/res/values/styles.xml                 |  73 ++++
 app/src/main/res/values/themes.xml                 |  32 ++
 .../java/invalid/lena/scrcpy/AtomicFilesTest.java  |  54 +++
 .../java/invalid/lena/scrcpy/AudioStreamTest.java  | 123 ++++++
 .../invalid/lena/scrcpy/ControlMessagesTest.java   |  65 +++
 .../invalid/lena/scrcpy/ControlStreamTest.java     | 152 +++++++
 .../test/java/invalid/lena/scrcpy/DevicesTest.java |  64 +++
 .../test/java/invalid/lena/scrcpy/SyncTest.java    | 137 ++++++
 .../java/invalid/lena/scrcpy/VideoStreamTest.java  | 245 +++++++++++
 .../test/java/invalid/lena/scrcpy/WireTest.java    |  94 ++++
 59 files changed, 5549 insertions(+)
 create mode 100644 app/src/debug/res/layout/mirror.xml
 create mode 100644 app/src/main/AndroidManifest.xml
 create mode 100644 app/src/main/assets/scrcpy-server.sha256
 create mode 100644 app/src/main/assets/scrcpy-server.version
 create mode 100644 app/src/main/java/invalid/lena/scrcpy/Adb.java
 create mode 100644 app/src/main/java/invalid/lena/scrcpy/App.java
 create mode 100644 app/src/main/java/invalid/lena/scrcpy/AtomicFiles.java
 create mode 100644 app/src/main/java/invalid/lena/scrcpy/AudioFrames.java
 create mode 100644 app/src/main/java/invalid/lena/scrcpy/AudioSink.java
 create mode 100644 app/src/main/java/invalid/lena/scrcpy/AudioStream.java
 create mode 100644 app/src/main/java/invalid/lena/scrcpy/ControlMessages.java
 create mode 100644 app/src/main/java/invalid/lena/scrcpy/ControlStream.java
 create mode 100644 app/src/main/java/invalid/lena/scrcpy/Controller.java
 create mode 100644 app/src/main/java/invalid/lena/scrcpy/Crashlog.java
 create mode 100644 app/src/main/java/invalid/lena/scrcpy/Devices.java
 create mode 100644 app/src/main/java/invalid/lena/scrcpy/Log.java
 create mode 100644 app/src/main/java/invalid/lena/scrcpy/Main.java
 create mode 100644 app/src/main/java/invalid/lena/scrcpy/Mirror.java
 create mode 100644 app/src/main/java/invalid/lena/scrcpy/MuxRecorder.java
 create mode 100644 app/src/main/java/invalid/lena/scrcpy/Server.java
 create mode 100644 app/src/main/java/invalid/lena/scrcpy/Session.java
 create mode 100644 app/src/main/java/invalid/lena/scrcpy/Sessions.java
 create mode 100644 app/src/main/java/invalid/lena/scrcpy/Settings.java
 create mode 100644 app/src/main/java/invalid/lena/scrcpy/SettingsActivity.java
 create mode 100644 app/src/main/java/invalid/lena/scrcpy/Sync.java
 create mode 100644 app/src/main/java/invalid/lena/scrcpy/VideoFrames.java
 create mode 100644 app/src/main/java/invalid/lena/scrcpy/VideoRecorder.java
 create mode 100644 app/src/main/java/invalid/lena/scrcpy/VideoSink.java
 create mode 100644 app/src/main/java/invalid/lena/scrcpy/VideoStream.java
 create mode 100644 app/src/main/java/invalid/lena/scrcpy/Wire.java
 create mode 100644 app/src/main/res/drawable/bg_card.xml
 create mode 100644 app/src/main/res/drawable/bg_field.xml
 create mode 100644 app/src/main/res/drawable/bg_status_pill.xml
 create mode 100644 app/src/main/res/drawable/btn_primary.xml
 create mode 100644 app/src/main/res/drawable/btn_secondary.xml
 create mode 100644 app/src/main/res/drawable/ic_device.xml
 create mode 100644 app/src/main/res/drawable/ic_launcher_background.xml
 create mode 100644 app/src/main/res/drawable/ic_launcher_foreground.xml
 create mode 100644 app/src/main/res/drawable/ic_notification.xml
 create mode 100644 app/src/main/res/drawable/ic_settings.xml
 create mode 100644 app/src/main/res/layout/device_row.xml
 create mode 100644 app/src/main/res/layout/main.xml
 create mode 100644 app/src/main/res/layout/mirror.xml
 create mode 100644 app/src/main/res/layout/settings.xml
 create mode 100644 app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
 create mode 100644 app/src/main/res/values/colors.xml
 create mode 100644 app/src/main/res/values/dimens.xml
 create mode 100644 app/src/main/res/values/ids.xml
 create mode 100644 app/src/main/res/values/strings.xml
 create mode 100644 app/src/main/res/values/styles.xml
 create mode 100644 app/src/main/res/values/themes.xml
 create mode 100644 app/src/test/java/invalid/lena/scrcpy/AtomicFilesTest.java
 create mode 100644 app/src/test/java/invalid/lena/scrcpy/AudioStreamTest.java
 create mode 100644 app/src/test/java/invalid/lena/scrcpy/ControlMessagesTest.java
 create mode 100644 app/src/test/java/invalid/lena/scrcpy/ControlStreamTest.java
 create mode 100644 app/src/test/java/invalid/lena/scrcpy/DevicesTest.java
 create mode 100644 app/src/test/java/invalid/lena/scrcpy/SyncTest.java
 create mode 100644 app/src/test/java/invalid/lena/scrcpy/VideoStreamTest.java
 create mode 100644 app/src/test/java/invalid/lena/scrcpy/WireTest.java

(limited to 'app/src')

diff --git a/app/src/debug/res/layout/mirror.xml b/app/src/debug/res/layout/mirror.xml
new file mode 100644
index 0000000..5d0e845
--- /dev/null
+++ b/app/src/debug/res/layout/mirror.xml
@@ -0,0 +1,93 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Debug Mirror layout: TextureView, the same top status bar as
+     production, plus a bottom-left stats overlay that screencap can
+     capture (target host, video/audio/texture-update counts, last
+     forwarded event). The TextureView path is used because emulators
+     don't composite SurfaceView's hardware layer into screencap. -->
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="#000000">
+
+    <TextureView
+        android:id="@+id/surface"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:layout_gravity="center"/>
+
+    <LinearLayout
+        android:id="@+id/status_bar"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_gravity="top"
+        android:orientation="horizontal"
+        android:gravity="center_vertical"
+        android:padding="8dp"
+        android:background="#a0000000">
+
+        <TextView
+            android:id="@+id/status_text"
+            android:layout_width="0dp"
+            android:layout_weight="1"
+            android:layout_height="wrap_content"
+            android:textColor="#ffffff"
+            android:textSize="14sp"
+            android:fontFamily="monospace"
+            android:singleLine="true"
+            android:ellipsize="end"
+            android:text="@string/connecting"/>
+
+        <Button
+            android:id="@+id/record"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginEnd="8dp"
+            android:text="@string/record"/>
+
+        <Button
+            android:id="@+id/reconnect"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/reconnect"
+            android:visibility="gone"/>
+
+    </LinearLayout>
+
+    <LinearLayout
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="bottom|start"
+        android:orientation="vertical"
+        android:padding="16dp"
+        android:background="#a0000000">
+
+        <TextView
+            android:id="@+id/overlay_target"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:textColor="#ffffff"
+            android:textSize="16sp"
+            android:fontFamily="monospace"
+            android:text="target: ..."/>
+
+        <TextView
+            android:id="@+id/overlay_stats"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:textColor="#aef0a0"
+            android:textSize="16sp"
+            android:fontFamily="monospace"
+            android:text="v=0  a=0"/>
+
+        <TextView
+            android:id="@+id/overlay_event"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:textColor="#f0c060"
+            android:textSize="16sp"
+            android:fontFamily="monospace"
+            android:text="event: (idle)"/>
+
+    </LinearLayout>
+
+</FrameLayout>
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
new file mode 100644
index 0000000..3e1e4f3
--- /dev/null
+++ b/app/src/main/AndroidManifest.xml
@@ -0,0 +1,49 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <uses-permission android:name="android.permission.INTERNET"/>
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE"/>
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_DATA_SYNC"/>
+    <uses-permission android:name="android.permission.POST_NOTIFICATIONS"/>
+
+    <application
+        android:name=".App"
+        android:label="@string/app_name"
+        android:icon="@mipmap/ic_launcher"
+        android:roundIcon="@mipmap/ic_launcher"
+        android:theme="@style/Theme.Scrcpy"
+        android:allowBackup="false"
+        android:supportsRtl="false">
+
+        <activity
+            android:name=".Main"
+            android:exported="true"
+            android:theme="@style/Theme.Scrcpy.NoActionBar">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+                <category android:name="android.intent.category.LAUNCHER"/>
+            </intent-filter>
+        </activity>
+
+        <activity
+            android:name=".Mirror"
+            android:exported="false"
+            android:configChanges="orientation|screenSize|keyboardHidden"
+            android:screenOrientation="unspecified"
+            android:hardwareAccelerated="true"
+            android:theme="@style/Theme.Scrcpy.Fullscreen"/>
+
+        <activity
+            android:name=".SettingsActivity"
+            android:exported="false"
+            android:label="@string/settings"/>
+
+        <service
+            android:name=".Sessions"
+            android:exported="false"
+            android:foregroundServiceType="dataSync"/>
+
+    </application>
+
+</manifest>
diff --git a/app/src/main/assets/scrcpy-server.sha256 b/app/src/main/assets/scrcpy-server.sha256
new file mode 100644
index 0000000..376a42f
--- /dev/null
+++ b/app/src/main/assets/scrcpy-server.sha256
@@ -0,0 +1 @@
+84924bd564a1eb6089c872c7521f968058977f91f5ff02514a8c74aff3210f3a
diff --git a/app/src/main/assets/scrcpy-server.version b/app/src/main/assets/scrcpy-server.version
new file mode 100644
index 0000000..5186d07
--- /dev/null
+++ b/app/src/main/assets/scrcpy-server.version
@@ -0,0 +1 @@
+4.0
diff --git a/app/src/main/java/invalid/lena/scrcpy/Adb.java b/app/src/main/java/invalid/lena/scrcpy/Adb.java
new file mode 100644
index 0000000..2909156
--- /dev/null
+++ b/app/src/main/java/invalid/lena/scrcpy/Adb.java
@@ -0,0 +1,210 @@
+package invalid.lena.scrcpy;
+
+import android.content.Context;
+
+import org.bouncycastle.asn1.ASN1EncodableVector;
+import org.bouncycastle.asn1.ASN1Encoding;
+import org.bouncycastle.asn1.ASN1Integer;
+import org.bouncycastle.asn1.DERBitString;
+import org.bouncycastle.asn1.DERSequence;
+import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
+import org.bouncycastle.asn1.x500.X500Name;
+import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
+import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
+import org.bouncycastle.asn1.x509.TBSCertificate;
+import org.bouncycastle.asn1.x509.Time;
+import org.bouncycastle.asn1.x509.V3TBSCertificateGenerator;
+
+import java.io.ByteArrayInputStream;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.math.BigInteger;
+import java.nio.file.Files;
+import java.security.KeyFactory;
+import java.security.KeyPair;
+import java.security.KeyPairGenerator;
+import java.security.PrivateKey;
+import java.security.SecureRandom;
+import java.security.Signature;
+import java.security.cert.Certificate;
+import java.security.cert.CertificateFactory;
+import java.security.spec.PKCS8EncodedKeySpec;
+import java.util.Date;
+import java.util.concurrent.TimeUnit;
+
+import io.github.muntashirakon.adb.AbsAdbConnectionManager;
+import io.github.muntashirakon.adb.AdbStream;
+import io.github.muntashirakon.adb.LocalServices;
+
+// Thin facade over libadb-android. One instance per process: pairs once,
+// connects per session, then exposes typed openers for the three streams
+// the rest of the app cares about (shell, sync, localabstract).
+//
+// The keypair lives in filesDir/{adbkey,adbcert}: PKCS#8 DER for the key,
+// X.509 DER for the cert. Software-backed RSA - AndroidKeyStore is unusable
+// here because libadb-android's auth path uses raw RSA/ECB/NoPadding which
+// hardware-backed keys refuse.
+public final class Adb extends AbsAdbConnectionManager {
+
+    private static final String DEVICE_NAME = "scrcpy-android";
+    private static final String KEY_FILE = "adbkey";
+    private static final String CERT_FILE = "adbcert";
+
+    // Per-operation timeout for adb protocol calls (pair/connect/openStream).
+    // libadb-android defaults to Long.MAX_VALUE; a hung target would block
+    // forever otherwise.
+    private static final long OP_TIMEOUT_MS = 15_000L;
+
+    // libadb-android's mApi is documented as "the target's API for protocol
+    // negotiation". We don't know the target's API at construction time;
+    // pinning to the current Android max means the protocol stays at its
+    // latest version, which is what wireless-debugging Android-11+ targets
+    // expect. Bump when newer protocol versions ship.
+    private static final int  TARGET_API_HINT = android.os.Build.VERSION_CODES.UPSIDE_DOWN_CAKE;
+
+    // Singleton: Main and Mirror both want an Adb; building two would
+    // race on the on-disk keypair and waste a RSA generation. Lazily
+    // initialised on the FIRST caller, which should be off the UI thread.
+    private static volatile Adb instance;
+
+    public static Adb getInstance(Context ctx) throws Exception {
+        Adb local = instance;
+        if (local != null) return local;
+        synchronized (Adb.class) {
+            if (instance == null) instance = new Adb(ctx.getApplicationContext());
+            return instance;
+        }
+    }
+
+    private final PrivateKey privateKey;
+    private final Certificate certificate;
+
+    private Adb(Context ctx) throws Exception {
+        setApi(TARGET_API_HINT);
+        setTimeout(OP_TIMEOUT_MS, TimeUnit.MILLISECONDS);
+        File keyFile = new File(ctx.getFilesDir(), KEY_FILE);
+        File certFile = new File(ctx.getFilesDir(), CERT_FILE);
+        if (keyFile.exists() && certFile.exists()) {
+            privateKey = loadKey(keyFile);
+            certificate = loadCert(certFile);
+            Log.i("adb: loaded keypair from %s", keyFile);
+        } else {
+            KeyPair kp = generateRsa();
+            privateKey = kp.getPrivate();
+            certificate = selfSignedCert(kp);
+            saveKey(keyFile, privateKey);
+            saveCert(certFile, certificate);
+            Log.i("adb: generated new keypair at %s", keyFile);
+        }
+    }
+
+    @Override protected PrivateKey getPrivateKey()  { return privateKey; }
+    @Override protected Certificate getCertificate() { return certificate; }
+    @Override protected String      getDeviceName() { return DEVICE_NAME; }
+
+    // ---- typed openers ----
+
+    public AdbStream openAbstract(String name) throws IOException, InterruptedException {
+        return openStream(LocalServices.LOCAL_UNIX_SOCKET_ABSTRACT, name);
+    }
+
+    public AdbStream openShell(String cmd) throws IOException, InterruptedException {
+        // Bypass LocalServices.getDestination(SHELL, args) - it wraps any
+        // arg containing a space in literal double quotes, and adbd then
+        // tries to exec `"the whole quoted thing"` as a single filename.
+        // Build the destination ourselves so the cmd reaches sh -c
+        // unmolested.
+        return openStream("shell:" + cmd);
+    }
+
+    public AdbStream openSync() throws IOException, InterruptedException {
+        return openStream(LocalServices.SYNC);
+    }
+
+    // ---- key + cert I/O ----
+
+    private static KeyPair generateRsa() throws Exception {
+        KeyPairGenerator gen = KeyPairGenerator.getInstance("RSA");
+        gen.initialize(2048, new SecureRandom());
+        return gen.generateKeyPair();
+    }
+
+    private static PrivateKey loadKey(File f) throws Exception {
+        byte[] data = Files.readAllBytes(f.toPath());
+        return KeyFactory.getInstance("RSA").generatePrivate(new PKCS8EncodedKeySpec(data));
+    }
+
+    private static Certificate loadCert(File f) throws Exception {
+        try (InputStream in = new FileInputStream(f)) {
+            return CertificateFactory.getInstance("X.509").generateCertificate(in);
+        }
+    }
+
+    private static void saveKey(File f, PrivateKey k) throws IOException {
+        AtomicFiles.write(f, k.getEncoded());
+    }
+
+    private static void saveCert(File f, Certificate c) throws Exception {
+        AtomicFiles.write(f, c.getEncoded());
+    }
+
+    // Build a minimal self-signed X.509 certificate over the keypair.
+    //
+    // ASN.1 layout (RFC 5280 sec. 4.1):
+    //
+    //   Certificate ::= SEQUENCE {
+    //     tbsCertificate       TBSCertificate,
+    //     signatureAlgorithm   AlgorithmIdentifier,    -- sha256WithRSAEnc
+    //     signature            BIT STRING               -- RSA over tbs
+    //   }
+    //
+    //   TBSCertificate ::= SEQUENCE {
+    //     version              [0] EXPLICIT v3,
+    //     serialNumber         INTEGER 1,
+    //     signatureAlgorithm   AlgorithmIdentifier,
+    //     issuer  = subject    Name (CN=scrcpy-android),
+    //     validity             { notBefore, notAfter },
+    //     subjectPublicKeyInfo SubjectPublicKeyInfo
+    //   }
+    //
+    // ADB validates the peer by the raw RSA public-key fingerprint in the
+    // SPKI bits, not by the DN or signature, so the surrounding cert is
+    // cosmetic - but a valid X.509 wrapper is still required for the TLS
+    // handshake that wireless-debugging uses post-pairing.
+    private static Certificate selfSignedCert(KeyPair kp) throws Exception {
+        long now = System.currentTimeMillis();
+        Date notBefore = new Date(now - 60_000L);
+        Date notAfter  = new Date(now + 50L * 365 * 24 * 3600 * 1000L);
+        X500Name dn = new X500Name("CN=" + DEVICE_NAME);
+        AlgorithmIdentifier sigAlg =
+                new AlgorithmIdentifier(PKCSObjectIdentifiers.sha256WithRSAEncryption);
+
+        V3TBSCertificateGenerator g = new V3TBSCertificateGenerator();
+        g.setSerialNumber(new ASN1Integer(BigInteger.ONE));
+        g.setSignature(sigAlg);
+        g.setIssuer(dn);
+        g.setSubject(dn);
+        g.setStartDate(new Time(notBefore));
+        g.setEndDate(new Time(notAfter));
+        g.setSubjectPublicKeyInfo(
+                SubjectPublicKeyInfo.getInstance(kp.getPublic().getEncoded()));
+
+        TBSCertificate tbs = g.generateTBSCertificate();
+
+        Signature s = Signature.getInstance("SHA256withRSA");
+        s.initSign(kp.getPrivate());
+        s.update(tbs.getEncoded(ASN1Encoding.DER));
+        byte[] sig = s.sign();
+
+        ASN1EncodableVector v = new ASN1EncodableVector();
+        v.add(tbs);
+        v.add(sigAlg);
+        v.add(new DERBitString(sig));
+        byte[] certDer = new DERSequence(v).getEncoded(ASN1Encoding.DER);
+
+        return CertificateFactory.getInstance("X.509")
+                .generateCertificate(new ByteArrayInputStream(certDer));
+    }
+}
diff --git a/app/src/main/java/invalid/lena/scrcpy/App.java b/app/src/main/java/invalid/lena/scrcpy/App.java
new file mode 100644
index 0000000..f28ec9d
--- /dev/null
+++ b/app/src/main/java/invalid/lena/scrcpy/App.java
@@ -0,0 +1,15 @@
+package invalid.lena.scrcpy;
+
+import android.app.Application;
+
+// Process-wide bootstrap. Only job today is to install the crash
+// logger before any of our code runs. Add other process-scoped init
+// here if it appears, but resist filling this with statics.
+public final class App extends Application {
+
+    @Override
+    public void onCreate() {
+        super.onCreate();
+        Crashlog.install(this);
+    }
+}
diff --git a/app/src/main/java/invalid/lena/scrcpy/AtomicFiles.java b/app/src/main/java/invalid/lena/scrcpy/AtomicFiles.java
new file mode 100644
index 0000000..6f755b6
--- /dev/null
+++ b/app/src/main/java/invalid/lena/scrcpy/AtomicFiles.java
@@ -0,0 +1,40 @@
+package invalid.lena.scrcpy;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.StandardCopyOption;
+
+// Crash-atomic whole-file write: stage the bytes into a sibling temp file,
+// fsync it, then rename it over the destination. The rename is the only
+// mutation a concurrent reader can observe, so a reader sees either the old
+// file or the new file in full, never a truncated mix. A crash mid-write
+// leaves at most a stale ".tmp", never a damaged destination.
+//
+// Deliberately no fsync of the parent directory: the rename itself may be
+// lost on power failure (the old content survives intact). Callers store
+// re-creatable state, so atomicity matters here and durability does not.
+//
+// android-free (java.io/java.nio only) so it is unit-testable on the JVM.
+final class AtomicFiles {
+
+    private AtomicFiles() {}
+
+    static void write(File dest, byte[] data) throws IOException {
+        File parent = dest.getAbsoluteFile().getParentFile();
+        File tmp = new File(parent, dest.getName() + ".tmp");
+        try (FileOutputStream os = new FileOutputStream(tmp)) {
+            os.write(data);
+            os.flush();
+            os.getFD().sync();
+        }
+        try {
+            Files.move(tmp.toPath(), dest.toPath(),
+                    StandardCopyOption.ATOMIC_MOVE, StandardCopyOption.REPLACE_EXISTING);
+        } catch (IOException e) {
+            tmp.delete();
+            throw e;
+        }
+    }
+}
diff --git a/app/src/main/java/invalid/lena/scrcpy/AudioFrames.java b/app/src/main/java/invalid/lena/scrcpy/AudioFrames.java
new file mode 100644
index 0000000..da0bb0a
--- /dev/null
+++ b/app/src/main/java/invalid/lena/scrcpy/AudioFrames.java
@@ -0,0 +1,18 @@
+package invalid.lena.scrcpy;
+
+// Sink for parsed audio frames. AudioSink is the only production
+// implementation; tests use a recording stub. Kept android-free.
+//
+// start(fourcc) tells the sink which wire codec it should expect.
+// For raw payloads are interleaved s16le PCM. For opus the first
+// frame has isConfig=true and payload is the OpusHead (the server
+// pre-strips the AOPUSHDR/AOPUSDLY/AOPUSPRL container); subsequent
+// frames are opus packets.
+public interface AudioFrames {
+
+    void start(int fourcc);
+
+    void feed(byte[] data, int off, int len, boolean isConfig);
+
+    void release();
+}
diff --git a/app/src/main/java/invalid/lena/scrcpy/AudioSink.java b/app/src/main/java/invalid/lena/scrcpy/AudioSink.java
new file mode 100644
index 0000000..2b3e32d
--- /dev/null
+++ b/app/src/main/java/invalid/lena/scrcpy/AudioSink.java
@@ -0,0 +1,215 @@
+package invalid.lena.scrcpy;
+
+import android.media.AudioAttributes;
+import android.media.AudioFormat;
+import android.media.AudioManager;
+import android.media.AudioTrack;
+import android.media.MediaCodec;
+import android.media.MediaFormat;
+import android.os.Handler;
+import android.os.HandlerThread;
+
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+
+// Audio output: AudioTrack writing 48 kHz stereo 16-bit PCM. The
+// upstream feed is either raw PCM (passthrough) or Opus packets
+// (decoded through MediaCodec into PCM first).
+public final class AudioSink implements AudioFrames {
+
+    private static final int SAMPLE_RATE = 48_000;
+    private static final int CHANNEL_OUT = AudioFormat.CHANNEL_OUT_STEREO;
+    private static final int ENCODING    = AudioFormat.ENCODING_PCM_16BIT;
+
+    // Defaults documented at <https://developer.android.com/reference/android/media/MediaCodec#CSD>.
+    private static final long DEFAULT_PRE_ROLL_NS = 80_000_000L;
+
+    private AudioTrack    track;
+    private MediaCodec    opusCodec;
+    private HandlerThread opusThread;
+    private Handler       opusHandler;
+    private boolean       opusConfigured;
+    private int           fourcc;
+
+    private volatile boolean released;
+    public  volatile long    frames; // public read for the status overlay
+    private long droppedBytes;
+    private long lastDropLogMs;
+
+    @Override
+    public void start(int fourcc) {
+        this.fourcc = fourcc;
+
+        int minBuf = AudioTrack.getMinBufferSize(SAMPLE_RATE, CHANNEL_OUT, ENCODING);
+        if (minBuf <= 0) throw new IllegalStateException("AudioTrack.getMinBufferSize=" + minBuf);
+        int bufSize = Math.max(minBuf, 32 * 1024);
+
+        AudioAttributes attrs = new AudioAttributes.Builder()
+                .setUsage(AudioAttributes.USAGE_MEDIA)
+                .setContentType(AudioAttributes.CONTENT_TYPE_MUSIC)
+                .build();
+        AudioFormat fmt = new AudioFormat.Builder()
+                .setSampleRate(SAMPLE_RATE)
+                .setChannelMask(CHANNEL_OUT)
+                .setEncoding(ENCODING)
+                .build();
+
+        track = new AudioTrack(
+                attrs, fmt, bufSize, AudioTrack.MODE_STREAM, AudioManager.AUDIO_SESSION_ID_GENERATE);
+        track.play();
+        Log.i("audio sink: AudioTrack started sr=%d ch=2 buf=%d", SAMPLE_RATE, bufSize);
+
+        if (fourcc == Wire.CODEC_OPUS) {
+            opusThread = new HandlerThread("audio-mc");
+            opusThread.start();
+            opusHandler = new Handler(opusThread.getLooper());
+            // Codec is created here, but only configured once the first
+            // FLAG_CONFIG frame arrives with the OpusHead bytes.
+            try {
+                opusCodec = MediaCodec.createDecoderByType(MediaFormat.MIMETYPE_AUDIO_OPUS);
+            } catch (IOException e) {
+                throw new IllegalStateException("audio sink: no opus decoder", e);
+            }
+            opusCodec.setCallback(new MediaCodec.Callback() {
+                @Override public void onInputBufferAvailable(MediaCodec mc, int idx) {
+                    // Frames are queued synchronously from feed(); we
+                    // don't pull on this callback. This handler exists
+                    // so MediaCodec's async machinery is wired up.
+                }
+                @Override public void onOutputBufferAvailable(MediaCodec mc, int idx,
+                                                              MediaCodec.BufferInfo info) {
+                    try {
+                        ByteBuffer out = mc.getOutputBuffer(idx);
+                        if (out != null && info.size > 0 && !released) {
+                            byte[] pcm = new byte[info.size];
+                            out.position(info.offset);
+                            out.limit(info.offset + info.size);
+                            out.get(pcm);
+                            writePcm(pcm, 0, pcm.length);
+                        }
+                    } catch (IllegalStateException ignored) {
+                    } finally {
+                        try { mc.releaseOutputBuffer(idx, false); }
+                        catch (IllegalStateException ignored) {}
+                    }
+                }
+                @Override public void onError(MediaCodec mc, MediaCodec.CodecException e) {
+                    Log.e(e, "audio sink: opus codec error");
+                }
+                @Override public void onOutputFormatChanged(MediaCodec mc, MediaFormat f) {
+                    Log.i("audio sink: opus output format %s", f);
+                }
+            }, opusHandler);
+        }
+    }
+
+    @Override
+    public void feed(byte[] data, int off, int len, boolean isConfig) {
+        if (released || len <= 0) return;
+        if (fourcc == Wire.CODEC_OPUS) {
+            feedOpus(data, off, len, isConfig);
+        } else {
+            // Raw PCM: passthrough.
+            frames++;
+            writePcm(data, off, len);
+        }
+    }
+
+    private void feedOpus(byte[] data, int off, int len, boolean isConfig) {
+        if (isConfig) {
+            if (opusConfigured) return; // already configured
+            // OpusHead is 19 bytes; pre_skip lives at bytes [10..11]. Reject
+            // anything shorter before indexing into it.
+            if (len < 19) {
+                Log.e("audio sink: opus head too short (%d bytes)", len);
+                return;
+            }
+            try {
+                byte[] head = new byte[len];
+                System.arraycopy(data, off, head, 0, len);
+                int preSkipSamples = ((head[10] & 0xff) | ((head[11] & 0xff) << 8));
+                long preSkipNs = preSkipSamples * 1_000_000_000L / SAMPLE_RATE;
+
+                MediaFormat fmt = MediaFormat.createAudioFormat(
+                        MediaFormat.MIMETYPE_AUDIO_OPUS, SAMPLE_RATE, 2);
+                fmt.setByteBuffer("csd-0", ByteBuffer.wrap(head));
+                fmt.setByteBuffer("csd-1", longLeBytes(preSkipNs));
+                fmt.setByteBuffer("csd-2", longLeBytes(DEFAULT_PRE_ROLL_NS));
+                opusCodec.configure(fmt, null, null, 0);
+                opusCodec.start();
+                opusConfigured = true;
+                Log.i("audio sink: opus configured, pre_skip=%d ns", preSkipNs);
+            } catch (Exception e) {
+                Log.e(e, "audio sink: opus configure");
+            }
+            return;
+        }
+        if (!opusConfigured) return;
+        // Encoded packet → MediaCodec input.
+        int idx;
+        try { idx = opusCodec.dequeueInputBuffer(0); }
+        catch (IllegalStateException e) { return; }
+        if (idx < 0) {
+            // No input buffer right now; drop the packet. Opus is forgiving
+            // about gaps for short stalls.
+            return;
+        }
+        try {
+            ByteBuffer in = opusCodec.getInputBuffer(idx);
+            if (in == null) return;
+            in.clear();
+            in.put(data, off, len);
+            opusCodec.queueInputBuffer(idx, 0, len, 0, 0);
+            frames++;
+        } catch (IllegalStateException e) {
+            Log.w("audio sink: opus queueInputBuffer: %s", e);
+        }
+    }
+
+    // Encode a long little-endian for MediaFormat csd-1 / csd-2.
+    private static ByteBuffer longLeBytes(long v) {
+        ByteBuffer b = ByteBuffer.allocate(8).order(ByteOrder.LITTLE_ENDIAN).putLong(v);
+        b.flip();
+        return b;
+    }
+
+    private void writePcm(byte[] data, int off, int len) {
+        AudioTrack t = track;
+        if (released || t == null || len <= 0) return;
+        int written = t.write(data, off, len, AudioTrack.WRITE_NON_BLOCKING);
+        if (written < 0) {
+            Log.w("audio sink: write rc=%d", written);
+            return;
+        }
+        if (written < len) {
+            droppedBytes += (len - written);
+            long now = System.currentTimeMillis();
+            if (now - lastDropLogMs > 1000L) {
+                lastDropLogMs = now;
+                Log.w("audio sink: ring full, dropped %d bytes so far", droppedBytes);
+            }
+        }
+    }
+
+    @Override
+    public void release() {
+        released = true;
+        MediaCodec c = opusCodec;
+        opusCodec = null;
+        HandlerThread ht = opusThread;
+        opusThread = null;
+        opusHandler = null;
+        if (c != null) {
+            try { c.stop(); } catch (Exception ignored) {}
+            try { c.release(); } catch (Exception ignored) {}
+        }
+        if (ht != null) ht.quitSafely();
+
+        AudioTrack t = track;
+        track = null;
+        if (t == null) return;
+        try { t.pause(); t.flush(); t.stop(); } catch (Exception ignored) {}
+        try { t.release(); } catch (Exception ignored) {}
+    }
+}
diff --git a/app/src/main/java/invalid/lena/scrcpy/AudioStream.java b/app/src/main/java/invalid/lena/scrcpy/AudioStream.java
new file mode 100644
index 0000000..39b184d
--- /dev/null
+++ b/app/src/main/java/invalid/lena/scrcpy/AudioStream.java
@@ -0,0 +1,93 @@
+package invalid.lena.scrcpy;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+// Reads the scrcpy audio socket and drives an AudioFrames sink.
+//
+// Wire format (big-endian, scrcpy 3.x/4.x):
+//   1) Stream meta:    uint32 fourcc
+//                      special values 0 = disabled, 1 = error
+//   2) Loop: 12-byte frame header (uint64 ptsAndFlags | uint32 size)
+//      followed by `size` bytes of payload.
+//
+// We honour FLAG_CONFIG on the per-frame header: for opus the first
+// frame is the OpusHead (sent with FLAG_CONFIG set), subsequent are
+// opus packets. For raw PCM the server never sets FLAG_CONFIG.
+//
+// Takes a plain InputStream; caller owns stream lifecycle.
+public final class AudioStream {
+
+    private static final long FLAG_CONFIG = 1L << 62;
+
+    // Generous upper bound for one audio packet (a raw PCM block or an
+    // opus packet is a few KB). A corrupt or hostile length field must
+    // not drive the allocation below.
+    private static final int MAX_FRAME_SIZE = 1024 * 1024;
+
+    private final InputStream  source;
+    private final AudioFrames  sink;
+    private Thread             thread;
+    private volatile boolean   stop;
+
+    public AudioStream(InputStream source, AudioFrames sink) {
+        this.source = source;
+        this.sink = sink;
+    }
+
+    public void start() {
+        thread = new Thread(this::run, "audio-reader");
+        thread.start();
+    }
+
+    public void stop() {
+        stop = true;
+        if (thread != null) thread.interrupt();
+    }
+
+    public void run() {
+        try {
+            byte[] four = new byte[4];
+            Wire.readFully(source, four);
+            int fourcc = Wire.readBe32(four, 0);
+            if (fourcc == 0) {
+                Log.w("audio: server reports stream disabled (target cannot capture)");
+                return;
+            }
+            if (fourcc == 1) {
+                Log.e("audio: server reports configuration error");
+                return;
+            }
+            if (fourcc != Wire.CODEC_RAW && fourcc != Wire.CODEC_OPUS) {
+                Log.w("audio: unexpected codec %s - keeping silent",
+                        Wire.fourccName(fourcc));
+                return;
+            }
+            Log.i("audio meta codec=%s", Wire.fourccName(fourcc));
+            sink.start(fourcc);
+
+            byte[] hdr = new byte[12];
+            byte[] payload = new byte[16 * 1024];
+            long frames = 0;
+            while (!stop) {
+                Wire.readFully(source, hdr);
+                long ptsAndFlags = Wire.readBe64(hdr, 0);
+                int  size = Wire.readBe32(hdr, 8);
+                boolean cfg = (ptsAndFlags & FLAG_CONFIG) != 0;
+                if (size <= 0 || size > MAX_FRAME_SIZE) {
+                    throw new IOException("audio frame size out of range: " + size);
+                }
+                if (size > payload.length) payload = new byte[size];
+                Wire.readFully(source, payload, 0, size);
+                sink.feed(payload, 0, size, cfg);
+                if (++frames == 1) Log.i("audio frame n=1 size=%d cfg=%s", size, cfg);
+            }
+        } catch (IOException e) {
+            if (!stop) Log.e(e, "audio reader");
+        } catch (Exception e) {
+            Log.e(e, "audio reader unexpected");
+        } finally {
+            Log.i("audio reader: end");
+        }
+    }
+}
diff --git a/app/src/main/java/invalid/lena/scrcpy/ControlMessages.java b/app/src/main/java/invalid/lena/scrcpy/ControlMessages.java
new file mode 100644
index 0000000..bd983ed
--- /dev/null
+++ b/app/src/main/java/invalid/lena/scrcpy/ControlMessages.java
@@ -0,0 +1,72 @@
+package invalid.lena.scrcpy;
+
+import java.nio.charset.StandardCharsets;
+
+// Pure-java encoders for scrcpy control messages. Layouts mirror
+// com.genymobile.scrcpy.control.ControlMessageReader in the scrcpy
+// server source. Extracted from Controller so the wire format can be
+// unit-tested without android.* on the classpath.
+public final class ControlMessages {
+
+    public static final int TYPE_INJECT_KEYCODE      = 0;
+    public static final int TYPE_INJECT_TEXT         = 1;
+    public static final int TYPE_INJECT_TOUCH_EVENT  = 2;
+    public static final int TYPE_BACK_OR_SCREEN_ON   = 4;
+    public static final int TYPE_SET_CLIPBOARD       = 9;
+
+    // KeyEvent.ACTION_DOWN / ACTION_UP. Mirror the int values rather
+    // than depend on android.view.KeyEvent so this stays android-free.
+    public static final int ACTION_DOWN = 0;
+    public static final int ACTION_UP   = 1;
+
+    public static final int TOUCH_MSG_LEN = 32; // 1 + 1 + 8 + 4 + 4 + 2 + 2 + 2 + 4 + 4
+    public static final int KEY_MSG_LEN   = 14; // 1 + 1 + 4 + 4 + 4
+    public static final int BACK_MSG_LEN  = 2;  // 1 + 1
+
+    private ControlMessages() {}
+
+    public static byte[] touch(int action, long pointerId,
+                               int x, int y, int targetW, int targetH,
+                               int pressureU16, int actionButton, int buttons) {
+        byte[] m = new byte[TOUCH_MSG_LEN];
+        m[0] = TYPE_INJECT_TOUCH_EVENT;
+        m[1] = (byte) action;
+        Wire.writeBe64(m, 2,  pointerId);
+        Wire.writeBe32(m, 10, x);
+        Wire.writeBe32(m, 14, y);
+        m[18] = (byte)(targetW >>> 8); m[19] = (byte) targetW;
+        m[20] = (byte)(targetH >>> 8); m[21] = (byte) targetH;
+        m[22] = (byte)(pressureU16 >>> 8); m[23] = (byte) pressureU16;
+        Wire.writeBe32(m, 24, actionButton);
+        Wire.writeBe32(m, 28, buttons);
+        return m;
+    }
+
+    public static byte[] keycode(int action, int keycode, int repeat, int metaState) {
+        byte[] m = new byte[KEY_MSG_LEN];
+        m[0] = TYPE_INJECT_KEYCODE;
+        m[1] = (byte) action;
+        Wire.writeBe32(m, 2,  keycode);
+        Wire.writeBe32(m, 6,  repeat);
+        Wire.writeBe32(m, 10, metaState);
+        return m;
+    }
+
+    // Single button-press event. scrcpy server interprets this as Back
+    // when the screen is on, or screen-on when it's off. We send a
+    // DOWN+UP pair to make a tap; this helper builds one byte pair.
+    public static byte[] backOrScreenOn(int action) {
+        return new byte[]{(byte) TYPE_BACK_OR_SCREEN_ON, (byte) action};
+    }
+
+    public static byte[] setClipboard(long sequence, boolean paste, String text) {
+        byte[] data = text.getBytes(StandardCharsets.UTF_8);
+        byte[] m = new byte[1 + 8 + 1 + 4 + data.length];
+        m[0] = TYPE_SET_CLIPBOARD;
+        Wire.writeBe64(m, 1, sequence);
+        m[9] = (byte)(paste ? 1 : 0);
+        Wire.writeBe32(m, 10, data.length);
+        System.arraycopy(data, 0, m, 14, data.length);
+        return m;
+    }
+}
diff --git a/app/src/main/java/invalid/lena/scrcpy/ControlStream.java b/app/src/main/java/invalid/lena/scrcpy/ControlStream.java
new file mode 100644
index 0000000..eea6c7d
--- /dev/null
+++ b/app/src/main/java/invalid/lena/scrcpy/ControlStream.java
@@ -0,0 +1,154 @@
+package invalid.lena.scrcpy;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.nio.charset.StandardCharsets;
+import java.util.concurrent.LinkedBlockingDeque;
+
+// Bidirectional bridge to the scrcpy control socket.
+//
+// Outbound: Controller hands us pre-encoded ControlMessage byte arrays
+// via send(); the writer thread drains them onto the OutputStream.
+// Queue is bounded; on overflow, the *oldest* intermediate
+// INJECT_TOUCH_EVENT with action=MOVE is dropped. Touch-down/up and key
+// events are never dropped, otherwise pointers get orphaned on the target.
+//
+// Inbound: the reader thread parses DeviceMessage frames from the
+// InputStream. v1 only cares about TYPE_CLIPBOARD; ACK_CLIPBOARD is
+// logged, UHID_OUTPUT is consumed and ignored.
+//
+// Constructor takes plain streams so this class is android-free.
+public final class ControlStream {
+
+    public interface InboundSink {
+        void onRemoteClipboard(String text);
+    }
+
+    private static final int TYPE_INJECT_TOUCH_EVENT = 2;
+    private static final int ACTION_MOVE              = 2;
+
+    private static final int DEV_TYPE_CLIPBOARD     = 0;
+    private static final int DEV_TYPE_ACK_CLIPBOARD = 1;
+    private static final int DEV_TYPE_UHID_OUTPUT   = 2;
+
+    private static final int MAX_QUEUED = 256;
+
+    private final InputStream  in;
+    private final OutputStream out;
+    private final LinkedBlockingDeque<byte[]> outbox = new LinkedBlockingDeque<>(MAX_QUEUED);
+
+    private volatile InboundSink sink;
+    private Thread writer;
+    private Thread reader;
+    private volatile boolean stop;
+
+    public ControlStream(InputStream in, OutputStream out) {
+        this.in = in;
+        this.out = out;
+    }
+
+    // Wired after construction: the Controller that consumes inbound
+    // messages needs this stream's send() to exist first.
+    public void setInboundSink(InboundSink sink) {
+        this.sink = sink;
+    }
+
+    public void start() {
+        writer = new Thread(this::runWriter, "control-writer");
+        reader = new Thread(this::runReader, "control-reader");
+        writer.start();
+        reader.start();
+    }
+
+    public void stop() {
+        stop = true;
+        outbox.clear();
+        if (writer != null) writer.interrupt();
+        if (reader != null) reader.interrupt();
+    }
+
+    public void send(byte[] msg) {
+        if (stop) return;
+        if (outbox.offerLast(msg)) return;
+
+        // Full: try to drop an intermediate touch-MOVE to make room.
+        // Touch-down/up and non-touch messages stay.
+        for (byte[] b : outbox) {
+            if (b.length >= 2 && b[0] == TYPE_INJECT_TOUCH_EVENT && (b[1] & 0xff) == ACTION_MOVE) {
+                if (outbox.remove(b)) break;
+            }
+        }
+        if (!outbox.offerLast(msg)) {
+            Log.w("control: outbox full, dropping msg type=%d", msg.length > 0 ? msg[0] & 0xff : -1);
+        }
+    }
+
+    // ---- writer ----
+
+    public void runWriter() {
+        try {
+            while (!stop) {
+                byte[] msg = outbox.takeFirst();
+                out.write(msg);
+                out.flush();
+            }
+        } catch (InterruptedException ignored) {
+        } catch (IOException e) {
+            if (!stop) Log.e(e, "control writer");
+        } finally {
+            Log.i("control writer: end");
+        }
+    }
+
+    // ---- reader ----
+
+    public void runReader() {
+        try {
+            byte[] tmp = new byte[12];
+            while (!stop) {
+                Wire.readFully(in, tmp, 0, 1);
+                int type = tmp[0] & 0xff;
+                switch (type) {
+                    case DEV_TYPE_CLIPBOARD: {
+                        Wire.readFully(in, tmp, 0, 4);
+                        int len = Wire.readBe32(tmp, 0);
+                        if (len < 0 || len > 1 << 20) {
+                            throw new IOException("clipboard len out of range: " + len);
+                        }
+                        byte[] data = new byte[len];
+                        Wire.readFully(in, data);
+                        String text = new String(data, StandardCharsets.UTF_8);
+                        InboundSink s = sink;
+                        if (s != null) s.onRemoteClipboard(text);
+                        break;
+                    }
+                    case DEV_TYPE_ACK_CLIPBOARD: {
+                        Wire.readFully(in, tmp, 0, 8);
+                        long seq = (long) Wire.readBe32(tmp, 0) << 32
+                                | (Wire.readBe32(tmp, 4) & 0xffffffffL);
+                        Log.i("control: ack clipboard seq=%d", seq);
+                        break;
+                    }
+                    case DEV_TYPE_UHID_OUTPUT: {
+                        Wire.readFully(in, tmp, 0, 4);
+                        int len = ((tmp[2] & 0xff) << 8) | (tmp[3] & 0xff);
+                        if (len > 0) {
+                            byte[] skip = new byte[len];
+                            Wire.readFully(in, skip);
+                        }
+                        break;
+                    }
+                    default:
+                        throw new IOException("unknown DeviceMessage type=" + type);
+                }
+            }
+        } catch (IOException e) {
+            if (!stop) Log.e(e, "control reader");
+        } catch (Exception e) {
+            Log.e(e, "control reader unexpected");
+        } finally {
+            Log.i("control reader: end");
+        }
+    }
+}
diff --git a/app/src/main/java/invalid/lena/scrcpy/Controller.java b/app/src/main/java/invalid/lena/scrcpy/Controller.java
new file mode 100644
index 0000000..88b9442
--- /dev/null
+++ b/app/src/main/java/invalid/lena/scrcpy/Controller.java
@@ -0,0 +1,173 @@
+package invalid.lena.scrcpy;
+
+import android.content.ClipData;
+import android.content.ClipboardManager;
+import android.content.Context;
+import android.view.KeyEvent;
+import android.view.MotionEvent;
+
+import java.util.function.Consumer;
+
+// Encodes UI events into scrcpy ControlMessage byte arrays and pushes
+// them at ControlStream. Also mirrors the remote clipboard locally and
+// echoes local clipboard changes the other way.
+//
+// Forwards multi-pointer touch and AOSP keycodes. Mouse buttons and
+// scroll wheels are not forwarded yet.
+public final class Controller implements ControlStream.InboundSink {
+
+    private final Consumer<byte[]>  sender;
+    private final ClipboardManager  clipboard;
+    public  volatile String         lastEvent = "(idle)";
+    // Held once so add/removePrimaryClipChangedListener see the same
+    // listener reference. Method references generate fresh lambdas
+    // each call site and the remove silently no-ops otherwise.
+    private final ClipboardManager.OnPrimaryClipChangedListener clipListener =
+            this::onLocalClipboardChanged;
+    private volatile int targetW, targetH;
+    private volatile int viewW,   viewH;
+
+    // Suppress one local clipboard change after we set it from a remote update.
+    private volatile boolean suppressNextClipChange;
+
+    public Controller(Context ctx, Consumer<byte[]> sender) {
+        this.sender = sender;
+        this.clipboard = (ClipboardManager) ctx.getSystemService(Context.CLIPBOARD_SERVICE);
+        if (clipboard != null) {
+            clipboard.addPrimaryClipChangedListener(clipListener);
+        }
+    }
+
+    public void release() {
+        if (clipboard != null) {
+            try { clipboard.removePrimaryClipChangedListener(clipListener); }
+            catch (Exception ignored) {}
+        }
+    }
+
+    public void setTargetSize(int w, int h) {
+        targetW = w; targetH = h;
+        Log.i("controller: target %dx%d", w, h);
+    }
+
+    public void setViewSize(int w, int h) {
+        viewW = w; viewH = h;
+    }
+
+    // ---- inbound ----
+
+    @Override
+    public void onRemoteClipboard(String text) {
+        Log.i("clipboard from target: %d chars", text.length());
+        if (clipboard == null) return;
+        suppressNextClipChange = true;
+        try {
+            clipboard.setPrimaryClip(ClipData.newPlainText("scrcpy-android", text));
+        } catch (Exception e) {
+            Log.w("clipboard set local failed: %s", e);
+            suppressNextClipChange = false;
+        }
+    }
+
+    private void onLocalClipboardChanged() {
+        if (suppressNextClipChange) {
+            suppressNextClipChange = false;
+            return;
+        }
+        if (clipboard == null) return;
+        ClipData data;
+        try { data = clipboard.getPrimaryClip(); }
+        catch (Exception e) { Log.w("clipboard get local failed: %s", e); return; }
+        if (data == null || data.getItemCount() == 0) return;
+        CharSequence cs = data.getItemAt(0).coerceToText(null);
+        if (cs == null) return;
+        sendSetClipboard(cs.toString(), false);
+        Log.i("clipboard to target: %d chars", cs.length());
+    }
+
+    // ---- outbound ----
+
+    public void onTouch(MotionEvent ev) {
+        int tw = targetW, th = targetH, vw = viewW, vh = viewH;
+        if (tw == 0 || th == 0 || vw == 0 || vh == 0) return;
+
+        // scrcpy's wire protocol uses ACTION_DOWN/UP/MOVE/CANCEL with a
+        // pointerId per message. The server tracks which pointers are
+        // currently down. So we translate Android's masked actions:
+        //   ACTION_POINTER_DOWN[i] -> ACTION_DOWN  (this pointer joins)
+        //   ACTION_POINTER_UP[i]   -> ACTION_UP    (this pointer leaves)
+        //   ACTION_MOVE            -> ACTION_MOVE for every current pointer
+        //   ACTION_CANCEL          -> ACTION_CANCEL for every current pointer
+        int action = ev.getActionMasked();
+        int idx    = ev.getActionIndex();
+        int n      = ev.getPointerCount();
+
+        switch (action) {
+            case MotionEvent.ACTION_DOWN:
+                sendPointer(ev, 0, MotionEvent.ACTION_DOWN, tw, th, vw, vh);
+                break;
+            case MotionEvent.ACTION_POINTER_DOWN:
+                sendPointer(ev, idx, MotionEvent.ACTION_DOWN, tw, th, vw, vh);
+                break;
+            case MotionEvent.ACTION_UP:
+                sendPointer(ev, 0, MotionEvent.ACTION_UP, tw, th, vw, vh);
+                break;
+            case MotionEvent.ACTION_POINTER_UP:
+                sendPointer(ev, idx, MotionEvent.ACTION_UP, tw, th, vw, vh);
+                break;
+            case MotionEvent.ACTION_MOVE:
+                for (int i = 0; i < n; i++) sendPointer(ev, i, MotionEvent.ACTION_MOVE, tw, th, vw, vh);
+                break;
+            case MotionEvent.ACTION_CANCEL:
+                for (int i = 0; i < n; i++) sendPointer(ev, i, MotionEvent.ACTION_CANCEL, tw, th, vw, vh);
+                break;
+            default:
+                return;
+        }
+    }
+
+    // Sizes come from onTouch's snapshot of the volatile fields, so a
+    // concurrent resize cannot zero a divisor between check and use.
+    private void sendPointer(MotionEvent ev, int index, int action,
+                             int tw, int th, int vw, int vh) {
+        long pointerId = ev.getPointerId(index);
+        int x = (int) ev.getX(index);
+        int y = (int) ev.getY(index);
+        int tx = (int) ((long) x * tw / vw);
+        int ty = (int) ((long) y * th / vh);
+        int pressure = (action == MotionEvent.ACTION_UP) ? 0
+                : (int)(ev.getPressure(index) * 0xffff) & 0xffff;
+        sender.accept(ControlMessages.touch(action, pointerId, tx, ty, tw, th,
+                pressure, /* actionButton */ 0, /* buttons */ 0));
+        lastEvent = "touch a=" + action + " (" + tx + "," + ty + ")";
+    }
+
+    public void onKey(KeyEvent ev) {
+        int tw = targetW, th = targetH;
+        if (tw == 0 || th == 0) return;
+        int action = ev.getAction(); // ACTION_DOWN=0, ACTION_UP=1
+        if (action != KeyEvent.ACTION_DOWN && action != KeyEvent.ACTION_UP) return;
+        sendKeycode(action, ev.getKeyCode(), ev.getRepeatCount(), ev.getMetaState());
+    }
+
+    // Fire a tap of the target's Back. scrcpy server treats the
+    // BACK_OR_SCREEN_ON message as Back when the target is on, screen-
+    // on when it's off - useful for waking a locked target too.
+    public void onBack() {
+        sender.accept(ControlMessages.backOrScreenOn(ControlMessages.ACTION_DOWN));
+        sender.accept(ControlMessages.backOrScreenOn(ControlMessages.ACTION_UP));
+        lastEvent = "back";
+    }
+
+    // ---- encoders (delegate to pure-java ControlMessages) ----
+
+    private void sendKeycode(int action, int keycode, int repeat, int metaState) {
+        sender.accept(ControlMessages.keycode(action, keycode, repeat, metaState));
+        lastEvent = "key  a=" + action + " kc=" + keycode;
+    }
+
+    private void sendSetClipboard(String text, boolean paste) {
+        sender.accept(ControlMessages.setClipboard(/* sequence */ 0L, paste, text));
+        lastEvent = "clip " + text.length() + " chars";
+    }
+}
diff --git a/app/src/main/java/invalid/lena/scrcpy/Crashlog.java b/app/src/main/java/invalid/lena/scrcpy/Crashlog.java
new file mode 100644
index 0000000..00bd3d8
--- /dev/null
+++ b/app/src/main/java/invalid/lena/scrcpy/Crashlog.java
@@ -0,0 +1,48 @@
+package invalid.lena.scrcpy;
+
+import android.content.Context;
+
+import java.io.File;
+import java.io.FileWriter;
+import java.io.PrintWriter;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.Locale;
+
+// Catches uncaught exceptions on any thread, writes them as plain
+// text to <externalFilesDir>/crash-<timestamp>.log, then chains to
+// the system default handler so the OS crash dialog still appears.
+// Testers can share the file from the app's storage instead of
+// fishing for it in adb logcat.
+public final class Crashlog {
+
+    private Crashlog() {}
+
+    public static void install(Context ctx) {
+        File dir = ctx.getExternalFilesDir(null);
+        if (dir == null) {
+            Log.w("crashlog: no external storage, skipping install");
+            return;
+        }
+        Thread.UncaughtExceptionHandler prev =
+                Thread.getDefaultUncaughtExceptionHandler();
+        Thread.setDefaultUncaughtExceptionHandler((t, e) -> {
+            try {
+                String ts = new SimpleDateFormat("yyyyMMdd-HHmmss",
+                        Locale.ROOT).format(new Date());
+                File out = new File(dir, "crash-" + ts + ".log");
+                try (PrintWriter pw = new PrintWriter(new FileWriter(out))) {
+                    pw.println("# " + new Date());
+                    pw.println("# thread=" + t.getName());
+                    pw.println();
+                    e.printStackTrace(pw);
+                }
+                Log.e(e, "crashlog: wrote %s", out.getAbsolutePath());
+            } catch (Throwable ignored) {
+                // best effort - do not mask the original crash
+            }
+            if (prev != null) prev.uncaughtException(t, e);
+        });
+        Log.i("crashlog: installed -> %s", dir.getAbsolutePath());
+    }
+}
diff --git a/app/src/main/java/invalid/lena/scrcpy/Devices.java b/app/src/main/java/invalid/lena/scrcpy/Devices.java
new file mode 100644
index 0000000..2883025
--- /dev/null
+++ b/app/src/main/java/invalid/lena/scrcpy/Devices.java
@@ -0,0 +1,126 @@
+package invalid.lena.scrcpy;
+
+import android.content.Context;
+
+import org.json.JSONArray;
+import org.json.JSONObject;
+
+import java.io.File;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.util.ArrayList;
+import java.util.List;
+
+// Tiny JSON-backed list of paired targets, stored at filesDir/devices.json.
+// No SQLite, no Room. Read on demand, written whole-file on add/remove.
+//
+// parse() / serialize() are pure-java and android-free for unit tests.
+// load() / save() add the Context-rooted file I/O.
+public final class Devices {
+
+    private static final String FILE = "devices.json";
+
+    public static final class Device {
+        public final String host;
+        public final int    port;
+
+        public Device(String host, int port) {
+            this.host = host;
+            this.port = port;
+        }
+
+        @Override
+        public String toString() {
+            return host + ":" + port;
+        }
+
+        @Override
+        public boolean equals(Object o) {
+            if (!(o instanceof Device d)) return false;
+            return port == d.port && host.equals(d.host);
+        }
+
+        @Override
+        public int hashCode() {
+            return host.hashCode() * 31 + port;
+        }
+    }
+
+    private Devices() {}
+
+    // Pure-java parse: returns whatever rows are well-formed; logs and
+    // skips anything malformed instead of nuking the list.
+    public static List<Device> parse(String json) {
+        List<Device> out = new ArrayList<>();
+        if (json == null) return out;
+        json = json.trim();
+        if (json.isEmpty()) return out;
+        JSONArray arr;
+        try { arr = new JSONArray(json); }
+        catch (Exception e) { Log.e(e, "devices: not a json array"); return out; }
+
+        for (int i = 0; i < arr.length(); i++) {
+            try {
+                JSONObject o = arr.getJSONObject(i);
+                out.add(new Device(o.getString("host"), o.getInt("port")));
+            } catch (Exception e) {
+                Log.w("devices: skipping malformed row %d: %s", i, e);
+            }
+        }
+        return out;
+    }
+
+    public static String serialize(List<Device> devices) {
+        try {
+            JSONArray arr = new JSONArray();
+            for (Device d : devices) {
+                JSONObject o = new JSONObject();
+                o.put("host", d.host);
+                o.put("port", d.port);
+                arr.put(o);
+            }
+            return arr.toString(2);
+        } catch (Exception e) {
+            Log.e(e, "devices: serialize failed");
+            return "[]";
+        }
+    }
+
+    public static List<Device> load(Context ctx) {
+        File f = new File(ctx.getFilesDir(), FILE);
+        if (!f.exists()) return new ArrayList<>();
+        try {
+            return parse(new String(Files.readAllBytes(f.toPath()), StandardCharsets.UTF_8));
+        } catch (Exception e) {
+            Log.e(e, "devices: load failed");
+            return new ArrayList<>();
+        }
+    }
+
+    public static void save(Context ctx, List<Device> devices) {
+        File f = new File(ctx.getFilesDir(), FILE);
+        try {
+            AtomicFiles.write(f, serialize(devices).getBytes(StandardCharsets.UTF_8));
+        } catch (Exception e) {
+            Log.e(e, "devices: save failed");
+        }
+    }
+
+    // Add or replace by host+port. Context-rooted; the in-place helper
+    // is the test seam.
+    public static List<Device> upsert(Context ctx, Device d) {
+        List<Device> list = load(ctx);
+        list.removeIf(d::equals);
+        list.add(d);
+        save(ctx, list);
+        return list;
+    }
+
+    // Remove the matching device (by host+port). Returns the updated list.
+    public static List<Device> remove(Context ctx, Device d) {
+        List<Device> list = load(ctx);
+        list.removeIf(d::equals);
+        save(ctx, list);
+        return list;
+    }
+}
diff --git a/app/src/main/java/invalid/lena/scrcpy/Log.java b/app/src/main/java/invalid/lena/scrcpy/Log.java
new file mode 100644
index 0000000..f2c7e87
--- /dev/null
+++ b/app/src/main/java/invalid/lena/scrcpy/Log.java
@@ -0,0 +1,26 @@
+package invalid.lena.scrcpy;
+
+import java.util.Locale;
+
+// Single static wrapper around android.util.Log so every line in this app
+// uses the same tag. Filter the whole app with `adb logcat -s scrcpy-android`.
+//
+// String.format always uses Locale.ROOT so logs are unaffected by device
+// locales that use comma decimals or other surprises.
+public final class Log {
+    public static final String TAG = "scrcpy-android";
+
+    private Log() {}
+
+    public static void i(String fmt, Object... a) { android.util.Log.i(TAG, fmt(fmt, a)); }
+    public static void w(String fmt, Object... a) { android.util.Log.w(TAG, fmt(fmt, a)); }
+    public static void e(String fmt, Object... a) { android.util.Log.e(TAG, fmt(fmt, a)); }
+
+    public static void e(Throwable t, String fmt, Object... a) {
+        android.util.Log.e(TAG, fmt(fmt, a), t);
+    }
+
+    private static String fmt(String fmt, Object... a) {
+        return a.length == 0 ? fmt : String.format(Locale.ROOT, fmt, a);
+    }
+}
diff --git a/app/src/main/java/invalid/lena/scrcpy/Main.java b/app/src/main/java/invalid/lena/scrcpy/Main.java
new file mode 100644
index 0000000..104f57f
--- /dev/null
+++ b/app/src/main/java/invalid/lena/scrcpy/Main.java
@@ -0,0 +1,150 @@
+package invalid.lena.scrcpy;
+
+import android.app.Activity;
+import android.app.AlertDialog;
+import android.content.Intent;
+import android.os.Bundle;
+import android.text.TextUtils;
+import android.view.View;
+import android.widget.ArrayAdapter;
+import android.widget.Button;
+import android.widget.EditText;
+import android.widget.ListView;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import java.util.List;
+
+// Pairing form + saved-device list.
+//
+// Layout: host, pair-port, pair-code, connect-port + a single "Pair and save"
+// button. After a successful pair() against the daemon, the row is appended
+// to devices.json with the *connect* port (different from the pair port on
+// Android 11+). Tapping a saved row launches the Mirror activity with the
+// target host/port; Mirror owns its own Adb instance loaded from the same
+// on-disk keypair.
+public final class Main extends Activity {
+
+    private volatile Adb adb;
+    private ArrayAdapter<Devices.Device> adapter;
+    private Button pairButton;
+
+    @Override
+    protected void onCreate(Bundle saved) {
+        super.onCreate(saved);
+        setContentView(R.layout.main);
+
+        EditText host        = findViewById(R.id.host);
+        EditText pairPort    = findViewById(R.id.pair_port);
+        EditText pairCode    = findViewById(R.id.pair_code);
+        EditText connectPort = findViewById(R.id.connect_port);
+        pairButton           = findViewById(R.id.pair);
+        View settingsBtn     = findViewById(R.id.settings);
+        ListView devices     = findViewById(R.id.devices);
+        TextView devicesEmpty = findViewById(R.id.devices_empty);
+
+        settingsBtn.setOnClickListener(v -> startActivity(
+                new Intent(this, SettingsActivity.class)));
+
+        adapter = new ArrayAdapter<>(this, R.layout.device_row, R.id.device_label, Devices.load(this));
+        devices.setAdapter(adapter);
+        devices.setEmptyView(devicesEmpty);
+
+        // RSA keygen on first launch can take 1-3 s; never on the UI thread.
+        pairButton.setEnabled(false);
+        new Thread(() -> {
+            try {
+                Adb a = Adb.getInstance(this);
+                runOnUiThread(() -> {
+                    adb = a;
+                    pairButton.setEnabled(true);
+                });
+            } catch (Exception e) {
+                Log.e(e, "adb init failed");
+                runOnUiThread(() -> {
+                    Toast.makeText(this, "adb init failed: " + e.getMessage(),
+                            Toast.LENGTH_LONG).show();
+                    finish();
+                });
+            }
+        }, "adb-init").start();
+
+        devices.setOnItemClickListener((parent, view, pos, id) -> {
+            Devices.Device d = adapter.getItem(pos);
+            Log.i("connect tap: %s", d);
+            Intent i = new Intent(this, Mirror.class);
+            i.putExtra(Mirror.EXTRA_HOST, d.host);
+            i.putExtra(Mirror.EXTRA_PORT, d.port);
+            startActivity(i);
+        });
+
+        devices.setOnItemLongClickListener((parent, view, pos, id) -> {
+            Devices.Device d = adapter.getItem(pos);
+            new AlertDialog.Builder(this)
+                    .setTitle(R.string.forget_device)
+                    .setMessage(d.host + ":" + d.port)
+                    .setPositiveButton(android.R.string.ok, (dlg, w) -> {
+                        Log.i("forget device: %s", d);
+                        List<Devices.Device> updated = Devices.remove(this, d);
+                        adapter.clear();
+                        adapter.addAll(updated);
+                        adapter.notifyDataSetChanged();
+                    })
+                    .setNegativeButton(android.R.string.cancel, null)
+                    .show();
+            return true;
+        });
+
+        pairButton.setOnClickListener(v -> {
+            if (adb == null) return; // still initialising
+            String h  = host.getText().toString().trim();
+            String pp = pairPort.getText().toString().trim();
+            String pc = pairCode.getText().toString().trim();
+            String cp = connectPort.getText().toString().trim();
+            if (TextUtils.isEmpty(h) || TextUtils.isEmpty(pp)
+                    || TextUtils.isEmpty(pc) || TextUtils.isEmpty(cp)) {
+                Toast.makeText(this, "fill all four fields", Toast.LENGTH_SHORT).show();
+                return;
+            }
+            int pairP, connP;
+            try {
+                pairP = Integer.parseInt(pp);
+                connP = Integer.parseInt(cp);
+            } catch (NumberFormatException e) {
+                Toast.makeText(this, "ports must be numeric", Toast.LENGTH_SHORT).show();
+                return;
+            }
+            if (pairP < 1 || pairP > 65535 || connP < 1 || connP > 65535) {
+                Toast.makeText(this, "ports must be 1-65535", Toast.LENGTH_SHORT).show();
+                return;
+            }
+            pairButton.setEnabled(false);
+            Toast.makeText(this, R.string.pairing, Toast.LENGTH_SHORT).show();
+            new Thread(() -> pairAndSave(h, pairP, pc, connP, pairButton), "pair").start();
+        });
+    }
+
+    private void pairAndSave(String host, int pairPort, String code, int connPort, Button btn) {
+        try {
+            Log.i("pair: %s:%d", host, pairPort);
+            boolean ok = adb.pair(host, pairPort, code);
+            if (!ok) throw new IllegalStateException("pair returned false");
+            Log.i("pair ok host=%s pair_port=%d", host, pairPort);
+            Devices.Device d = new Devices.Device(host, connPort);
+            List<Devices.Device> updated = Devices.upsert(this, d);
+            runOnUiThread(() -> {
+                adapter.clear();
+                adapter.addAll(updated);
+                adapter.notifyDataSetChanged();
+                Toast.makeText(this, "paired and saved", Toast.LENGTH_SHORT).show();
+                btn.setEnabled(true);
+            });
+        } catch (Exception e) {
+            Log.e(e, "pair failed");
+            runOnUiThread(() -> {
+                Toast.makeText(this, "pair failed: " + e.getMessage(), Toast.LENGTH_LONG).show();
+                btn.setEnabled(true);
+            });
+        }
+    }
+}
diff --git a/app/src/main/java/invalid/lena/scrcpy/Mirror.java b/app/src/main/java/invalid/lena/scrcpy/Mirror.java
new file mode 100644
index 0000000..f6e249d
--- /dev/null
+++ b/app/src/main/java/invalid/lena/scrcpy/Mirror.java
@@ -0,0 +1,471 @@
+package invalid.lena.scrcpy;
+
+import android.Manifest;
+import android.app.Activity;
+import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.graphics.SurfaceTexture;
+import android.os.Build;
+import android.os.Bundle;
+import android.os.Handler;
+import android.os.Looper;
+import android.view.KeyEvent;
+import android.view.MotionEvent;
+import android.view.Surface;
+import android.view.SurfaceHolder;
+import android.view.SurfaceView;
+import android.view.TextureView;
+import android.view.View;
+import android.view.WindowInsets;
+import android.view.WindowInsetsController;
+import android.view.WindowManager;
+import android.widget.Button;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import java.io.File;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.Locale;
+
+// Full-screen mirror activity. Pulls target host/port from intent
+// extras, starts a Sessions foreground service to keep the process
+// alive during brief backgrounding, and owns the Session itself.
+//
+// Two layouts ship: src/main/res/layout/mirror.xml (release: SurfaceView
+// + status bar) and src/debug/res/layout/mirror.xml (debug: TextureView
+// + status bar + bottom stats overlay used by the e2e screen capture
+// because emulators don't composite SurfaceView into screencap).
+//
+// Surface lifetime is decoupled from session lifetime: when the surface
+// goes away (rotation, background) we swap the session's video surface
+// to null and let the wire keep draining. When the surface comes back
+// we swap the new one in. Audio and control streams are unaffected.
+//
+// Session state vs activity lifetime: a fatal session error does NOT
+// finish() the activity any more - instead the status bar transitions
+// to DISCONNECTED and exposes a Reconnect button.
+public final class Mirror extends Activity {
+
+    public static final String EXTRA_HOST = "host";
+    public static final String EXTRA_PORT = "port";
+
+    // Arbitrary request code for POST_NOTIFICATIONS - we don't react to
+    // the result; the system caches the choice for next launch.
+    private static final int RQ_POST_NOTIFICATIONS = 1001;
+
+    private enum State { CONNECTING, CONNECTED, DISCONNECTED }
+
+    private volatile Adb   adb;
+    private Devices.Device target;
+    private Session        session;
+    private Surface        currentSurface;
+    private State          state = State.CONNECTING;
+    private int            connectedW, connectedH;
+
+    // Only one of these is non-null per build variant.
+    private TextureView textureView;
+    private SurfaceView surfaceView;
+
+    // Always present (declared in both layouts).
+    private View     statusBar;
+    private TextView statusText;
+    private Button   reconnectBtn;
+    private Button   recordBtn;
+
+    // Overlay TextViews - only present in the debug layout. null in release.
+    private TextView overlayTarget, overlayStats, overlayEvent;
+    private final Handler ui = new Handler(Looper.getMainLooper());
+    private int textureUpdates;
+
+    @Override
+    protected void onCreate(Bundle saved) {
+        super.onCreate(saved);
+        setContentView(R.layout.mirror);
+        immersive();
+        // Hold the source screen awake for as long as Mirror is in
+        // front. Cleared automatically when the activity is destroyed.
+        getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
+
+        String host = getIntent().getStringExtra(EXTRA_HOST);
+        int port = getIntent().getIntExtra(EXTRA_PORT, -1);
+        if (host == null || port <= 0) {
+            Log.e("mirror: bad extras host=%s port=%d", host, port);
+            finish();
+            return;
+        }
+        target = new Devices.Device(host, port);
+
+        View v = findViewById(R.id.surface);
+        if (v instanceof TextureView) {
+            textureView = (TextureView) v;
+            textureView.setSurfaceTextureListener(textureListener);
+        } else if (v instanceof SurfaceView) {
+            surfaceView = (SurfaceView) v;
+            surfaceView.getHolder().addCallback(holderCallback);
+        } else {
+            Log.e("mirror: layout has no SurfaceView or TextureView at R.id.surface");
+            finish();
+            return;
+        }
+
+        statusBar    = findViewById(R.id.status_bar);
+        statusText   = findViewById(R.id.status_text);
+        reconnectBtn = findViewById(R.id.reconnect);
+        recordBtn    = findViewById(R.id.record);
+        reconnectBtn.setOnClickListener(view -> reconnect());
+        recordBtn.setOnClickListener(view -> toggleRecord());
+        updateStatusBar();
+
+        overlayTarget = findViewById(R.id.overlay_target);
+        overlayStats  = findViewById(R.id.overlay_stats);
+        overlayEvent  = findViewById(R.id.overlay_event);
+        if (overlayTarget != null) {
+            overlayTarget.setText("target: " + host + ":" + port);
+            ui.postDelayed(this::pollOverlay, 200);
+        }
+
+        requestNotificationsIfNeeded();
+        startForegroundService(new Intent(this, Sessions.class));
+
+        if (!Settings.hintBackShown(this)) {
+            Toast.makeText(this, R.string.hint_long_press_back,
+                    Toast.LENGTH_LONG).show();
+            Settings.setHintBackShown(this, true);
+        }
+
+        new Thread(() -> {
+            try {
+                Adb a = Adb.getInstance(this);
+                runOnUiThread(() -> {
+                    adb = a;
+                    if (session == null && currentSurface != null) {
+                        startSession(currentSurface);
+                    }
+                });
+            } catch (Exception e) {
+                Log.e(e, "mirror: adb init");
+                runOnUiThread(() -> {
+                    Toast.makeText(this, "adb init: " + e.getMessage(),
+                            Toast.LENGTH_LONG).show();
+                    finish();
+                });
+            }
+        }, "adb-init").start();
+    }
+
+    // ---- surface lifecycle: TextureView path ----
+
+    private final TextureView.SurfaceTextureListener textureListener =
+            new TextureView.SurfaceTextureListener() {
+        @Override
+        public void onSurfaceTextureAvailable(SurfaceTexture st, int w, int h) {
+            Log.i("mirror: texture available %dx%d", w, h);
+            attachSurface(new Surface(st), w, h);
+        }
+        @Override
+        public void onSurfaceTextureSizeChanged(SurfaceTexture st, int w, int h) {
+            Log.i("mirror: texture resized %dx%d", w, h);
+            if (session != null) session.setViewSize(w, h);
+        }
+        @Override
+        public boolean onSurfaceTextureDestroyed(SurfaceTexture st) {
+            Log.i("mirror: texture destroyed");
+            detachSurface();
+            return true;
+        }
+        @Override
+        public void onSurfaceTextureUpdated(SurfaceTexture st) {
+            if (++textureUpdates == 1 || textureUpdates % 30 == 0) {
+                Log.i("mirror: texture updates=%d", textureUpdates);
+            }
+        }
+    };
+
+    // ---- surface lifecycle: SurfaceView path ----
+
+    private final SurfaceHolder.Callback holderCallback = new SurfaceHolder.Callback() {
+        @Override
+        public void surfaceCreated(SurfaceHolder holder) {
+            Log.i("mirror: surface created");
+            attachSurface(holder.getSurface(), 0, 0);
+        }
+        @Override
+        public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
+            Log.i("mirror: surface changed %dx%d", w, h);
+            if (session != null) session.setViewSize(w, h);
+        }
+        @Override
+        public void surfaceDestroyed(SurfaceHolder holder) {
+            Log.i("mirror: surface destroyed");
+            detachSurface();
+        }
+    };
+
+    // ---- session driver ----
+
+    private void attachSurface(Surface s, int w, int h) {
+        currentSurface = s;
+        if (session != null) {
+            session.swapSurface(s);
+            if (w > 0) session.setViewSize(w, h);
+            return;
+        }
+        if (adb == null) return; // adb-init thread will start the session
+        if (state == State.DISCONNECTED) return; // wait for user to tap reconnect
+        startSession(s);
+        if (w > 0) session.setViewSize(w, h);
+    }
+
+    private void detachSurface() {
+        currentSurface = null;
+        if (session != null) session.swapSurface(null);
+    }
+
+    private void startSession(Surface s) {
+        state = State.CONNECTING;
+        updateStatusBar();
+        session = new Session(this, adb, target, s, new Session.Listener() {
+            @Override public void onConnected(int w, int h) {
+                runOnUiThread(() -> {
+                    state = State.CONNECTED;
+                    connectedW = w; connectedH = h;
+                    updateStatusBar();
+                });
+            }
+            @Override public void onReconnecting() {
+                Log.i("mirror: link lost, reconnecting");
+                runOnUiThread(() -> {
+                    state = State.CONNECTING;
+                    updateStatusBar();
+                });
+            }
+            @Override public void onError(Throwable t) {
+                runOnUiThread(() -> {
+                    Toast.makeText(Mirror.this,
+                            "session error: " + t.getMessage(), Toast.LENGTH_LONG).show();
+                });
+            }
+            @Override public void onStopped() {
+                Log.i("mirror: session stopped");
+                runOnUiThread(() -> {
+                    state = State.DISCONNECTED;
+                    updateStatusBar();
+                });
+            }
+        });
+        session.start();
+    }
+
+    private void toggleRecord() {
+        if (session == null) return;
+        if (session.isRecording()) {
+            session.stopRecording();
+            Toast.makeText(this, "recording saved", Toast.LENGTH_SHORT).show();
+        } else {
+            File dir = getExternalFilesDir(null);
+            if (dir == null) {
+                Toast.makeText(this, "no external storage", Toast.LENGTH_LONG).show();
+                return;
+            }
+            String ts = new SimpleDateFormat("yyyyMMdd-HHmmss", Locale.ROOT).format(new Date());
+            File out = new File(dir, "scrcpy-" + ts + ".mp4");
+            session.armRecording(out);
+            Toast.makeText(this, "recording -> " + out.getName(), Toast.LENGTH_SHORT).show();
+        }
+        updateRecordButton();
+    }
+
+    private void updateRecordButton() {
+        boolean on = session != null && session.isRecording();
+        recordBtn.setText(on ? R.string.record_on : R.string.record);
+    }
+
+    private void reconnect() {
+        Log.i("mirror: reconnect tapped");
+        Session old = session;
+        session = null;
+        state = State.CONNECTING;
+        updateStatusBar();
+        // Stop the old session off the UI thread (teardown closes
+        // sockets and joins the server's log pump), THEN start the new
+        // one. Sequencing matters: both sessions share the singleton
+        // Adb, so the old teardown's disconnect must finish before the
+        // new bring-up connects.
+        new Thread(() -> {
+            if (old != null) old.stop();
+            runOnUiThread(() -> {
+                if (session != null) return;  // another path already started one
+                if (adb == null || currentSurface == null) return;
+                startSession(currentSurface);
+            });
+        }, "session-stop").start();
+    }
+
+    private void updateStatusBar() {
+        if (statusText == null) return;
+        String s;
+        switch (state) {
+            case CONNECTED:
+                s = String.format(Locale.ROOT, "%s:%d  %dx%d  %s",
+                        target.host, target.port, connectedW, connectedH,
+                        Settings.videoCodec(this));
+                break;
+            case DISCONNECTED:
+                s = String.format(Locale.ROOT, "%s:%d  %s",
+                        target.host, target.port, getString(R.string.disconnected));
+                break;
+            default:
+                s = String.format(Locale.ROOT, "%s:%d  %s",
+                        target.host, target.port, getString(R.string.connecting));
+        }
+        statusText.setText(s);
+        reconnectBtn.setVisibility(state == State.DISCONNECTED ? View.VISIBLE : View.GONE);
+        recordBtn.setEnabled(state == State.CONNECTED);
+        updateRecordButton();
+
+        // Hide the whole bar while actively mirroring if the user opted
+        // out; keep it up whenever not CONNECTED so the status and the
+        // Reconnect button stay reachable.
+        if (statusBar != null) {
+            boolean show = Settings.showStatusBar(this) || state != State.CONNECTED;
+            statusBar.setVisibility(show ? View.VISIBLE : View.GONE);
+        }
+    }
+
+    // ---- overlay (debug only - fields are null in release) ----
+
+    private void pollOverlay() {
+        if (overlayStats == null) return;
+        if (session != null) {
+            overlayStats.setText(String.format(Locale.ROOT,
+                    "v=%-4d  a=%-4d  tex=%-4d",
+                    session.videoFrames(), session.audioFrames(), textureUpdates));
+            overlayEvent.setText("event: " + session.lastEvent());
+        }
+        ui.postDelayed(this::pollOverlay, 200);
+    }
+
+    // ---- input ----
+
+    @Override
+    public boolean onTouchEvent(MotionEvent ev) {
+        if (session != null) {
+            session.onTouch(ev);
+            return true;
+        }
+        return super.onTouchEvent(ev);
+    }
+
+    @Override
+    public boolean onKeyDown(int keyCode, KeyEvent event) {
+        if (keyCode == KeyEvent.KEYCODE_BACK) {
+            event.startTracking();
+            return true;
+        }
+        return super.onKeyDown(keyCode, event);
+    }
+
+    @Override
+    public boolean onKeyLongPress(int keyCode, KeyEvent event) {
+        if (keyCode == KeyEvent.KEYCODE_BACK && session != null) {
+            session.onBack();
+            return true;
+        }
+        return super.onKeyLongPress(keyCode, event);
+    }
+
+    @Override
+    public boolean dispatchKeyEvent(KeyEvent ev) {
+        if (ev.getKeyCode() == KeyEvent.KEYCODE_BACK) {
+            return super.dispatchKeyEvent(ev);
+        }
+        if (session != null && shouldForward(ev)) {
+            session.onKey(ev);
+            return true;
+        }
+        return super.dispatchKeyEvent(ev);
+    }
+
+    // ---- lifecycle ----
+
+    @Override
+    protected void onDestroy() {
+        super.onDestroy();
+        ui.removeCallbacksAndMessages(null);
+        Session s = session;
+        session = null;
+        if (s != null) {
+            // Teardown blocks on socket closes and a thread join; keep
+            // it off the UI thread.
+            new Thread(s::stop, "session-stop").start();
+        }
+        stopService(new Intent(this, Sessions.class));
+    }
+
+    // Android 13+ requires runtime grant for POST_NOTIFICATIONS. The
+    // foreground service notification is silently suppressed if the
+    // user never sees the dialog, and on Android 14+ a notification-
+    // less FGS can be killed at any time.
+    private void requestNotificationsIfNeeded() {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.TIRAMISU) return;
+        if (checkSelfPermission(Manifest.permission.POST_NOTIFICATIONS)
+                == PackageManager.PERMISSION_GRANTED) return;
+        requestPermissions(new String[]{Manifest.permission.POST_NOTIFICATIONS},
+                RQ_POST_NOTIFICATIONS);
+    }
+
+    private void immersive() {
+        WindowInsetsController c = getWindow().getInsetsController();
+        if (c != null) {
+            c.hide(WindowInsets.Type.systemBars());
+            c.setSystemBarsBehavior(WindowInsetsController.BEHAVIOR_SHOW_TRANSIENT_BARS_BY_SWIPE);
+        }
+        getWindow().setDecorFitsSystemWindows(false);
+    }
+
+    private static boolean shouldForward(KeyEvent ev) {
+        int code = ev.getKeyCode();
+        if (code >= KeyEvent.KEYCODE_DPAD_UP && code <= KeyEvent.KEYCODE_DPAD_CENTER) return true;
+        if (code >= KeyEvent.KEYCODE_0 && code <= KeyEvent.KEYCODE_9) return true;
+        if (code >= KeyEvent.KEYCODE_A && code <= KeyEvent.KEYCODE_Z) return true;
+        switch (code) {
+            case KeyEvent.KEYCODE_SPACE:
+            case KeyEvent.KEYCODE_ENTER:
+            case KeyEvent.KEYCODE_DEL:
+            case KeyEvent.KEYCODE_FORWARD_DEL:
+            case KeyEvent.KEYCODE_TAB:
+            case KeyEvent.KEYCODE_ESCAPE:
+            case KeyEvent.KEYCODE_PAGE_UP:
+            case KeyEvent.KEYCODE_PAGE_DOWN:
+            case KeyEvent.KEYCODE_MOVE_HOME:
+            case KeyEvent.KEYCODE_MOVE_END:
+            case KeyEvent.KEYCODE_INSERT:
+            case KeyEvent.KEYCODE_SHIFT_LEFT:
+            case KeyEvent.KEYCODE_SHIFT_RIGHT:
+            case KeyEvent.KEYCODE_CTRL_LEFT:
+            case KeyEvent.KEYCODE_CTRL_RIGHT:
+            case KeyEvent.KEYCODE_ALT_LEFT:
+            case KeyEvent.KEYCODE_ALT_RIGHT:
+            case KeyEvent.KEYCODE_META_LEFT:
+            case KeyEvent.KEYCODE_META_RIGHT:
+            case KeyEvent.KEYCODE_CAPS_LOCK:
+            case KeyEvent.KEYCODE_NUM_LOCK:
+            case KeyEvent.KEYCODE_SCROLL_LOCK:
+            case KeyEvent.KEYCODE_COMMA:
+            case KeyEvent.KEYCODE_PERIOD:
+            case KeyEvent.KEYCODE_SLASH:
+            case KeyEvent.KEYCODE_BACKSLASH:
+            case KeyEvent.KEYCODE_SEMICOLON:
+            case KeyEvent.KEYCODE_APOSTROPHE:
+            case KeyEvent.KEYCODE_GRAVE:
+            case KeyEvent.KEYCODE_LEFT_BRACKET:
+            case KeyEvent.KEYCODE_RIGHT_BRACKET:
+            case KeyEvent.KEYCODE_MINUS:
+            case KeyEvent.KEYCODE_EQUALS:
+                return true;
+            default:
+                return false;
+        }
+    }
+}
diff --git a/app/src/main/java/invalid/lena/scrcpy/MuxRecorder.java b/app/src/main/java/invalid/lena/scrcpy/MuxRecorder.java
new file mode 100644
index 0000000..457272e
--- /dev/null
+++ b/app/src/main/java/invalid/lena/scrcpy/MuxRecorder.java
@@ -0,0 +1,225 @@
+package invalid.lena.scrcpy;
+
+import android.media.MediaCodec;
+import android.media.MediaFormat;
+import android.media.MediaMuxer;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.ByteBuffer;
+
+// MP4 muxer that taps the H.264/H.265/AV1 elementary stream coming
+// straight from the scrcpy server - no re-encode, the bytes go onto
+// disk verbatim. AV1 muxing into MP4 needs Android 11+ (MediaMuxer
+// learned the codec there); we are minSdk 35 so that's fine.
+//
+// State machine: IDLE → (arm) → ARMED → (next keyframe) → RECORDING
+//                                                          → (stop) → IDLE
+//
+// Ordering:
+//   onMeta(fcc, w, h)   from VideoStream session-meta packets.
+//   onFrame(...)         every frame, in wire order. Config frames
+//                        carry SPS/PPS; we cache the most recent one
+//                        as csd-0 for MediaMuxer.addTrack.
+//
+// Resize during recording closes the file (addTrack-after-start is
+// illegal). User can re-arm; a fresh output gets the new dimensions.
+public final class MuxRecorder implements VideoRecorder {
+
+    public interface Listener {
+        // Fires on the recorder thread; main use is updating the UI's
+        // record button label once writing actually begins (we may be
+        // ARMED for many frames before a keyframe lands).
+        default void onStarted(File out) {}
+        default void onStopped(File out, long bytes) {}
+        default void onError(Throwable t) {}
+    }
+
+    private enum State { IDLE, ARMED, RECORDING, ERROR }
+
+    private final Object lock = new Object();
+    private final Listener listener;
+
+    private State state = State.IDLE;
+    private int   fourcc, w, h;
+    private byte[] csd;
+
+    private File         outFile;
+    private MediaMuxer   muxer;
+    private int          trackIdx = -1;
+    private long         bytesWritten;
+    private long         firstPtsUs = -1;
+    private long         lastPtsUs  = -1;
+
+    public MuxRecorder() { this(null); }
+
+    public MuxRecorder(Listener listener) {
+        this.listener = listener != null ? listener : new Listener() {};
+    }
+
+    // Externally-driven controls.
+
+    public void arm(File out) {
+        synchronized (lock) {
+            if (state != State.IDLE) {
+                Log.w("rec: arm ignored in state %s", state);
+                return;
+            }
+            outFile = out;
+            state = State.ARMED;
+            firstPtsUs = -1;
+            lastPtsUs  = -1;
+            bytesWritten = 0;
+        }
+        Log.i("rec: armed -> %s", out);
+    }
+
+    public void stop() {
+        File out;
+        long bytes;
+        boolean reportStopped;
+        synchronized (lock) {
+            if (state == State.IDLE) return;
+            reportStopped = (state == State.RECORDING);
+            closeMuxerLocked();
+            out = outFile;
+            bytes = bytesWritten;
+            state = State.IDLE;
+            outFile = null;
+        }
+        Log.i("rec: stopped (%d bytes)", bytes);
+        if (reportStopped) listener.onStopped(out, bytes);
+    }
+
+    public boolean isActive() {
+        synchronized (lock) {
+            return state == State.ARMED || state == State.RECORDING;
+        }
+    }
+
+    // VideoRecorder callbacks.
+
+    @Override
+    public void onMeta(int fcc, int width, int height) {
+        synchronized (lock) {
+            // Resize during recording → close, surface as an error so
+            // the UI can re-arm. addTrack after start is illegal; we
+            // don't try to splice tracks together.
+            if (state == State.RECORDING && (fcc != fourcc || width != w || height != h)) {
+                Log.w("rec: resize/codec change during recording - closing");
+                File out = outFile;
+                long bytes = bytesWritten;
+                closeMuxerLocked();
+                state = State.IDLE;
+                outFile = null;
+                listener.onStopped(out, bytes);
+            }
+            fourcc = fcc; w = width; h = height;
+        }
+    }
+
+    @Override
+    public void onFrame(byte[] data, long ptsUs, boolean isConfig, boolean isKeyframe) {
+        if (isConfig) {
+            // Cache the latest CSD (SPS/PPS for h264 - vendor packs as
+            // Annex-B NAL units, exactly what MediaMuxer wants in csd-0
+            // for AVC/HEVC/AV1).
+            synchronized (lock) {
+                csd = data.clone();
+            }
+            return;
+        }
+        synchronized (lock) {
+            switch (state) {
+                case IDLE:
+                case ERROR:
+                    return;
+                case ARMED:
+                    if (!isKeyframe || csd == null) return;
+                    if (!startMuxerLocked()) {
+                        state = State.ERROR;
+                        return;
+                    }
+                    writeSampleLocked(data, ptsUs, true);
+                    state = State.RECORDING;
+                    listener.onStarted(outFile);
+                    return;
+                case RECORDING:
+                    writeSampleLocked(data, ptsUs, isKeyframe);
+            }
+        }
+    }
+
+    @Override
+    public void close() {
+        stop();
+    }
+
+    // --- internals; all called with `lock` held ---
+
+    private boolean startMuxerLocked() {
+        String mime = mimeFor(fourcc);
+        if (mime == null) {
+            Log.e("rec: unsupported codec %s", Wire.fourccName(fourcc));
+            return false;
+        }
+        try {
+            muxer = new MediaMuxer(outFile.getAbsolutePath(),
+                    MediaMuxer.OutputFormat.MUXER_OUTPUT_MPEG_4);
+            MediaFormat fmt = MediaFormat.createVideoFormat(mime, w, h);
+            fmt.setByteBuffer("csd-0", ByteBuffer.wrap(csd));
+            trackIdx = muxer.addTrack(fmt);
+            muxer.start();
+            Log.i("rec: muxer start %s %dx%d -> %s", mime, w, h, outFile);
+            return true;
+        } catch (IOException | IllegalStateException e) {
+            Log.e(e, "rec: muxer start failed");
+            try { if (muxer != null) muxer.release(); } catch (Exception ignored) {}
+            muxer = null;
+            trackIdx = -1;
+            listener.onError(e);
+            return false;
+        }
+    }
+
+    private void writeSampleLocked(byte[] data, long ptsUs, boolean isKeyframe) {
+        if (muxer == null) return;
+        // PTS is rebased to zero so the file is self-contained; some
+        // players choke on absolute PTS that doesn't start near zero.
+        if (firstPtsUs < 0) firstPtsUs = ptsUs;
+        long rebased = ptsUs - firstPtsUs;
+        if (rebased < 0) rebased = 0;
+        // Monotonic guard - MediaMuxer fails the write if pts goes back.
+        if (rebased <= lastPtsUs) rebased = lastPtsUs + 1;
+        lastPtsUs = rebased;
+
+        try {
+            ByteBuffer buf = ByteBuffer.wrap(data);
+            MediaCodec.BufferInfo info = new MediaCodec.BufferInfo();
+            info.set(0, data.length, rebased,
+                    isKeyframe ? MediaCodec.BUFFER_FLAG_KEY_FRAME : 0);
+            muxer.writeSampleData(trackIdx, buf, info);
+            bytesWritten += data.length;
+        } catch (IllegalStateException e) {
+            Log.w("rec: writeSampleData: %s", e);
+        }
+    }
+
+    private void closeMuxerLocked() {
+        MediaMuxer m = muxer;
+        muxer = null;
+        trackIdx = -1;
+        if (m == null) return;
+        try { m.stop(); } catch (Exception ignored) {}
+        try { m.release(); } catch (Exception ignored) {}
+    }
+
+    private static String mimeFor(int fourcc) {
+        switch (fourcc) {
+            case Wire.CODEC_H264: return MediaFormat.MIMETYPE_VIDEO_AVC;
+            case Wire.CODEC_H265: return MediaFormat.MIMETYPE_VIDEO_HEVC;
+            case Wire.CODEC_AV1:  return MediaFormat.MIMETYPE_VIDEO_AV1;
+            default: return null;
+        }
+    }
+}
diff --git a/app/src/main/java/invalid/lena/scrcpy/Server.java b/app/src/main/java/invalid/lena/scrcpy/Server.java
new file mode 100644
index 0000000..cc16b44
--- /dev/null
+++ b/app/src/main/java/invalid/lena/scrcpy/Server.java
@@ -0,0 +1,304 @@
+package invalid.lena.scrcpy;
+
+import android.content.Context;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.OutputStream;
+import java.nio.charset.StandardCharsets;
+import java.security.SecureRandom;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.concurrent.atomic.AtomicReference;
+
+import io.github.muntashirakon.adb.AdbStream;
+
+// Bring the scrcpy server up on the target:
+//   1. Push assets/scrcpy-server.jar to /data/local/tmp/scrcpy-server.jar
+//      via the adb sync protocol.
+//   2. Spawn `app_process / com.genymobile.scrcpy.Server <ver> key=value...`
+//      via an adb shell stream and hold it open. cleanup=true means the
+//      server exits when we close that stream.
+//   3. Open three localabstract:scrcpy_<scid> streams in order
+//      (video, audio, control). With tunnel_forward=true the server is
+//      the listener, so we just dial.
+//   4. Drain 1 probe byte + 64-byte device name from the FIRST stream
+//      that the server accepts (video, if requested).
+//
+// Returns a Streams record with everything Session needs: typed
+// InputStream/OutputStream wrappers (opened ONCE per AdbStream so the
+// reader's offset is unambiguous), plus the underlying AdbStream
+// handles so close() can release them.
+public final class Server {
+
+    private static final String REMOTE_PATH    = "/data/local/tmp/scrcpy-server.jar";
+    private static final String ASSET_JAR      = "scrcpy-server.jar";
+    private static final String ASSET_VERSION  = "scrcpy-server.version";
+    private static final int    FILE_MODE      = 0100644;         // regular file, 0644
+    // Server forks a CleanUp helper before opening its abstract sockets;
+    // on slow emulators that takes several seconds, so the budget needs
+    // to be generous. Wall-clock bounded: even if every attempt wedges
+    // for the full OPEN_ATTEMPT_TIMEOUT_MS, the total stays near
+    // OPEN_DEADLINE_MS - strictly below the e2e test deadline
+    // (test-rig/e2e.sh's E2E_DEADLINE, default 60 s), or the test
+    // would fail the wrong way.
+    private static final long   OPEN_DEADLINE_MS     = 20_000;
+    private static final int    OPEN_BACKOFF_MS      = 100;
+    // Per-attempt timeout for adb.openAbstract. libadb-android's
+    // AdbConnection.open() blocks on a naked stream.wait() with no
+    // loop or timeout - a missed notification (response arrives before
+    // we park) wedges the call forever. Wrap each attempt with a
+    // timeout + interrupt so the loop can move on.
+    private static final long   OPEN_ATTEMPT_TIMEOUT_MS = 800;
+
+    public static final class Streams {
+        public final AdbStream    videoAds, audioAds, controlAds;
+        public final InputStream  videoIn, audioIn, controlIn;
+        public final OutputStream controlOut;
+        public final String       deviceName;
+        public final String       scid;
+        public final String       version;
+
+        Streams(AdbStream va, AdbStream aa, AdbStream ca,
+                InputStream vi, InputStream ai, InputStream ci, OutputStream co,
+                String name, String scid, String version) {
+            this.videoAds = va; this.audioAds = aa; this.controlAds = ca;
+            this.videoIn = vi;  this.audioIn = ai;  this.controlIn = ci;
+            this.controlOut = co;
+            this.deviceName = name; this.scid = scid; this.version = version;
+        }
+    }
+
+    private final Context ctx;
+    private final Adb     adb;
+    private AdbStream     shell;
+    private Thread        shellPump;
+    private Streams       streams;
+    private volatile boolean serverEof;
+
+    public Server(Context ctx, Adb adb) {
+        this.ctx = ctx;
+        this.adb = adb;
+    }
+
+    public Streams bringUp() throws Exception {
+        String version = readVersion();
+        long pushed = push();
+        Log.i("push %s bytes=%d", REMOTE_PATH, pushed);
+
+        String scid = newScid();
+        String cmd = buildCmdline(version, scid);
+        Log.i("spawn server ver=%s scid=%s", version, scid);
+        Log.i("cmdline: %s", cmd);
+
+        shell = adb.openShell(cmd);
+        shellPump = new Thread(() -> pump(shell.openInputStream()), "server-stdout");
+        shellPump.setDaemon(true);
+        shellPump.start();
+
+        AdbStream va = openAbstract(scid);
+        AdbStream aa = openAbstract(scid);
+        AdbStream ca = openAbstract(scid);
+
+        InputStream  vi = va.openInputStream();
+        InputStream  ai = aa.openInputStream();
+        InputStream  ci = ca.openInputStream();
+        OutputStream co = ca.openOutputStream();
+
+        String name = readDeviceMeta(vi);
+        Log.i("device name=%s", name);
+        streams = new Streams(va, aa, ca, vi, ai, ci, co, name, scid, version);
+        return streams;
+    }
+
+    // Idempotent. Closes the three media/control streams first (lets
+    // the wire drain), then the shell (which makes the scrcpy server
+    // exit via cleanup=true), then gives the cleanup helper up to
+    // CLOSE_GRACE_MS to restore device state - display power, screen
+    // timeout, brightness, etc. - before we kill the adb connection
+    // out from under it. Best-effort: cleanup is server-side and we
+    // can't synchronously confirm it.
+    public void close() {
+        if (streams != null) {
+            closeQuietly(streams.videoAds);
+            closeQuietly(streams.audioAds);
+            closeQuietly(streams.controlAds);
+            streams = null;
+        }
+        Thread t = shellPump;
+        AdbStream s = shell;
+        shell = null;
+        shellPump = null;
+        closeQuietly(s);
+        if (t != null) {
+            try { t.join(CLOSE_GRACE_MS); }
+            catch (InterruptedException ignored) {}
+            if (t.isAlive()) t.interrupt();
+        }
+    }
+
+    private static final long CLOSE_GRACE_MS = 500;
+
+    private static void closeQuietly(AdbStream s) {
+        if (s == null) return;
+        try { s.close(); } catch (IOException ignored) {}
+    }
+
+    // ---- helpers ----
+
+    private String readVersion() throws IOException {
+        try (InputStream in = ctx.getAssets().open(ASSET_VERSION)) {
+            byte[] buf = new byte[64];
+            int n = 0, r;
+            while ((r = in.read(buf, n, buf.length - n)) > 0) n += r;
+            String v = new String(buf, 0, n, StandardCharsets.UTF_8).trim();
+            if (v.isEmpty()) {
+                throw new IOException("scrcpy-server.version is empty");
+            }
+            return v;
+        }
+    }
+
+    private static String newScid() {
+        // 31-bit random, 8 lowercase hex chars - matches scrcpy upstream client.
+        int v = new SecureRandom().nextInt() & 0x7fffffff;
+        return String.format("%08x", v);
+    }
+
+    private String buildCmdline(String version, String scid) {
+        String videoCodec = Settings.videoCodec(ctx);
+        String audioCodec = Settings.audioCodec(ctx);
+        int maxSize     = Settings.maxSize(ctx);
+        int videoBitR   = Settings.videoBitRate(ctx);
+        int maxFps      = Settings.maxFps(ctx);
+        List<String> args = new ArrayList<>();
+        args.add("CLASSPATH=" + REMOTE_PATH);
+        args.add("app_process");
+        args.add("/");
+        args.add("com.genymobile.scrcpy.Server");
+        args.add(version);
+        args.add("scid=" + scid);
+        args.add("log_level=info");
+        args.add("video=true");
+        args.add("audio=true");
+        args.add("control=true");
+        args.add("video_codec=" + videoCodec);
+        args.add("audio_codec=" + audioCodec);
+        args.add("max_size=" + maxSize);
+        args.add("video_bit_rate=" + videoBitR);
+        if (maxFps > 0) args.add("max_fps=" + maxFps);
+        args.add("clipboard_autosync=true");
+        args.add("tunnel_forward=true");
+        args.add("cleanup=true");
+        args.add("power_on=true");
+        return String.join(" ", args);
+    }
+
+    private AdbStream openAbstract(String scid) throws Exception {
+        String name = "scrcpy_" + scid;
+        long deadline = System.currentTimeMillis() + OPEN_DEADLINE_MS;
+        Throwable last = null;
+        for (int attempt = 1; System.currentTimeMillis() < deadline; attempt++) {
+            // If the shell stream closed (server died early - usually with
+            // an error printed to stderr that our pump captured), bail
+            // immediately. Otherwise we'd spin out the deadline on a
+            // dead target.
+            if (serverEof) {
+                throw new IOException("server exited before opening "
+                        + name + " (see 'server:' logs)",
+                        last instanceof Exception ? (Exception) last : null);
+            }
+            try {
+                AdbStream s = openAbstractOnce(name, OPEN_ATTEMPT_TIMEOUT_MS);
+                Log.i("openAbstract %s ok (attempt %d)", name, attempt);
+                return s;
+            } catch (Throwable t) {
+                last = t;
+                Thread.sleep(OPEN_BACKOFF_MS);
+            }
+        }
+        throw new IOException("openAbstract " + name + " failed after "
+                + (OPEN_DEADLINE_MS / 1000) + " s",
+                last instanceof Exception ? (Exception) last : null);
+    }
+
+    // Wraps a single adb.openAbstract call with a hard timeout. The
+    // upstream call can wedge forever on a missed notify in its naked
+    // stream.wait(); we run it on a daemon thread and join with timeout,
+    // interrupt on overrun, and let the caller retry. If the orphaned
+    // call succeeds after we gave up, the stream must be closed:
+    // keeping it would silently consume one of the scrcpy server's
+    // three accepts and shift every later dial off by one.
+    private AdbStream openAbstractOnce(String name, long timeoutMs) throws Exception {
+        AtomicReference<AdbStream> result = new AtomicReference<>();
+        AtomicReference<Throwable>  err   = new AtomicReference<>();
+        AtomicBoolean abandoned = new AtomicBoolean();
+        Thread t = new Thread(() -> {
+            try {
+                AdbStream s = adb.openAbstract(name);
+                result.set(s);
+                if (abandoned.get()) closeQuietly(s);
+            } catch (Throwable ex) {
+                err.set(ex);
+            }
+        }, "openAbstract-" + name);
+        t.setDaemon(true);
+        t.start();
+        t.join(timeoutMs);
+        if (t.isAlive()) {
+            abandoned.set(true);
+            t.interrupt();
+            // One side of the publish/abandon race closes the stream;
+            // closeQuietly tolerates both doing it.
+            closeQuietly(result.get());
+            throw new IOException("openAbstract " + name + " timed out");
+        }
+        Throwable ex = err.get();
+        if (ex instanceof Exception) throw (Exception) ex;
+        if (ex != null) throw new RuntimeException(ex);
+        return result.get();
+    }
+
+    private static String readDeviceMeta(InputStream in) throws IOException {
+        byte[] probe = new byte[1];
+        Wire.readFully(in, probe);
+        byte[] name = new byte[64];
+        Wire.readFully(in, name);
+        int n = 0;
+        while (n < name.length && name[n] != 0) n++;
+        return new String(name, 0, n, StandardCharsets.UTF_8);
+    }
+
+    private void pump(InputStream in) {
+        try (BufferedReader r = new BufferedReader(new InputStreamReader(in, StandardCharsets.UTF_8))) {
+            String line;
+            while ((line = r.readLine()) != null) {
+                Log.i("server: %s", line);
+            }
+        } catch (IOException e) {
+            if (!Thread.currentThread().isInterrupted()) Log.w("server-stdout closed: %s", e);
+        } finally {
+            serverEof = true;
+            Log.i("server: stream end");
+        }
+    }
+
+    // ---- adb sync push ----
+
+    private long push() throws Exception {
+        AdbStream sync = adb.openSync();
+        // sync.openInput/OutputStream() return wrapper streams whose close()
+        // is a no-op; the AdbStream itself owns the channel. Close it once
+        // in finally.
+        try (InputStream src = ctx.getAssets().open(ASSET_JAR)) {
+            int mtime = (int)(System.currentTimeMillis() / 1000L);
+            return Sync.push(src, sync.openOutputStream(), sync.openInputStream(),
+                    REMOTE_PATH, FILE_MODE, mtime);
+        } finally {
+            try { sync.close(); } catch (IOException ignored) {}
+        }
+    }
+}
diff --git a/app/src/main/java/invalid/lena/scrcpy/Session.java b/app/src/main/java/invalid/lena/scrcpy/Session.java
new file mode 100644
index 0000000..019ce80
--- /dev/null
+++ b/app/src/main/java/invalid/lena/scrcpy/Session.java
@@ -0,0 +1,318 @@
+package invalid.lena.scrcpy;
+
+import android.content.Context;
+import android.view.KeyEvent;
+import android.view.MotionEvent;
+import android.view.Surface;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+// One mirroring session: owns the Adb connection, the spawned scrcpy
+// server, the three streams, sinks, and the controller. start() and
+// stop() are idempotent and may be called from any thread.
+//
+// Listener contract:
+//   onConnected(w,h) - wire open, frames flowing. Fires on the first
+//                  connect and again after each successful auto-reconnect.
+//   onReconnecting() - a live link dropped; the bring-up ladder is rerun.
+//                  Followed by onConnected (recovered) or onError (gave up).
+//   onError(t)   - fatal: retries exhausted, or non-retriable failure.
+//                  Always followed by onStopped().
+//   onStopped()  - final state. Fires exactly once per session, whether
+//                  user stop() or retries-exhausted.
+//
+// Auto-reconnect: after a successful connect the video socket is watched;
+// if it ends mid-session (target sleep, Wi-Fi blip, server crash) the
+// session reruns the bring-up ladder instead of freezing. Only when that
+// ladder is exhausted does it give up via onError + onStopped.
+//
+// Surface-readiness race: Mirror.surfaceCreated builds the Session and
+// calls start(), but Mirror.surfaceChanged (which carries the view
+// dimensions) can fire before run() has finished constructing Controller.
+// setViewSize() therefore stashes the value and applies it as soon as
+// the Controller is available.
+public final class Session {
+
+    public interface Listener {
+        // Fires the first time the server reports a session-meta packet
+        // (wire open, frames about to flow), and again after each
+        // successful auto-reconnect. Useful for the activity's status bar.
+        default void onConnected(int w, int h) {}
+        // A previously-live link dropped and we are bringing it back up.
+        // Followed by onConnected (recovered), onError (gave up), or
+        // onStopped alone (user stop() raced the reconnect).
+        default void onReconnecting() {}
+        void onError(Throwable t);
+        void onStopped();
+    }
+
+    // Bring-up retry budget. Total worst-case wait ~ sum of these
+    // delays + per-attempt bring-up time. Keep below e2e.sh's deadline.
+    private static final long[] BACKOFF_MS = {0L, 1_500L, 5_000L};
+
+    private final Context        ctx;
+    private final Adb            adb;
+    private final Devices.Device target;
+    private volatile Surface     surface;
+    private final Listener       listener;
+
+    // Lightweight counters for the in-app status overlay; readers reach
+    // into the sinks/controller directly.
+    public long videoFrames()  { VideoSink v = videoSink;   return v == null ? 0 : v.frames; }
+    public long audioFrames()  { AudioSink a = audioSink;   return a == null ? 0 : a.frames; }
+    public String lastEvent()  { Controller c = controller; return c == null ? "(idle)" : c.lastEvent; }
+
+    private Server        server;
+    private VideoStream   videoStream;
+    private VideoSink     videoSink;
+    private AudioStream   audioStream;
+    private AudioSink     audioSink;
+    private ControlStream controlStream;
+    private Controller    controller;
+    private MuxRecorder   recorder;
+    private Thread        runner;
+    private volatile boolean stopped;
+    private volatile int  pendingViewW, pendingViewH;
+
+    // Counted down by the video reader when its loop exits; the session
+    // thread parks on it for the live duration of a connection. Swapped
+    // for a fresh latch on each reconnect cycle.
+    private volatile CountDownLatch endSignal = new CountDownLatch(1);
+
+    public Session(Context ctx, Adb adb, Devices.Device target, Surface surface, Listener listener) {
+        this.ctx = ctx;
+        this.adb = adb;
+        this.target = target;
+        this.surface = surface;
+        this.listener = listener;
+    }
+
+    public synchronized void start() {
+        if (runner != null) return;
+        runner = new Thread(this::run, "session");
+        runner.start();
+    }
+
+    public synchronized void stop() {
+        if (stopped) return;
+        stopped = true;
+        Log.i("session: stop");
+        tearDownInstalled();
+        if (listener != null) listener.onStopped();
+    }
+
+    // ---- input forwarding (Controller stays internal) ----
+
+    public void onTouch(MotionEvent ev) {
+        Controller c = controller;
+        if (c != null) c.onTouch(ev);
+    }
+
+    public void onKey(KeyEvent ev) {
+        Controller c = controller;
+        if (c != null) c.onKey(ev);
+    }
+
+    public void onBack() {
+        Controller c = controller;
+        if (c != null) c.onBack();
+    }
+
+    public void setViewSize(int w, int h) {
+        pendingViewW = w; pendingViewH = h;
+        Controller c = controller;
+        if (c != null) c.setViewSize(w, h);
+    }
+
+    // ---- recording (delegates to MuxRecorder) ----
+
+    public void armRecording(File out) {
+        MuxRecorder r = recorder;
+        if (r == null) {
+            Log.w("session: armRecording before bring-up - ignored");
+            return;
+        }
+        r.arm(out);
+    }
+
+    public void stopRecording() {
+        MuxRecorder r = recorder;
+        if (r != null) r.stop();
+    }
+
+    public boolean isRecording() {
+        MuxRecorder r = recorder;
+        return r != null && r.isActive();
+    }
+
+    // Swap the surface the video pipeline draws to. The audio and control
+    // sides keep streaming, so audio + clipboard still work while the
+    // activity is backgrounded. Pass null to detach; pass a new Surface
+    // (from a recreated SurfaceView) to resume rendering.
+    public void swapSurface(Surface s) {
+        surface = s;
+        VideoSink vk = videoSink;
+        if (vk != null) vk.setOutputSurface(s);
+    }
+
+    // ---- internals ----
+
+    // Supervisor loop: connect, park until the live pipeline dies, and
+    // reconnect if the death wasn't a user stop(). Runs on one thread for
+    // the whole session lifetime.
+    private void run() {
+        while (!stopped) {
+            if (!connect()) return;        // gave up: onError + onStopped fired
+            try {
+                endSignal.await();         // park until the pipeline dies or stop()
+            } catch (InterruptedException ie) {
+                return;
+            }
+            // Decide teardown-and-retry under the monitor so a concurrent
+            // stop() can't interleave: without this, onReconnecting()
+            // could fire after stop()'s onStopped(), breaking the
+            // listener contract.
+            synchronized (this) {
+                if (stopped) return;       // user stop()
+                Log.i("session: video stream ended - link lost, reconnecting");
+                tearDownInstalled();
+                endSignal = new CountDownLatch(1);
+                if (listener != null) listener.onReconnecting();
+            }
+        }
+    }
+
+    // Run the bring-up retry ladder once. Returns true when a session is
+    // live (read threads started); false if the budget was exhausted, in
+    // which case onError() + onStopped() have already fired.
+    private boolean connect() {
+        Throwable lastErr = null;
+        for (int attempt = 0; attempt < BACKOFF_MS.length && !stopped; attempt++) {
+            if (BACKOFF_MS[attempt] > 0) {
+                Log.i("session: retry %d/%d after %d ms",
+                        attempt + 1, BACKOFF_MS.length, BACKOFF_MS[attempt]);
+                try { Thread.sleep(BACKOFF_MS[attempt]); }
+                catch (InterruptedException ie) { return false; }
+                if (stopped) return false;
+            }
+            try {
+                bringUp();
+                return true; // success; the read threads own the live session
+            } catch (InterruptedException ie) {
+                return false;
+            } catch (Throwable t) {
+                Log.w("session: bring-up attempt %d/%d failed: %s",
+                        attempt + 1, BACKOFF_MS.length, t);
+                lastErr = t;
+                // Discard any partial state from this attempt before retrying.
+                tearDownInstalled();
+            }
+        }
+        if (stopped) return false;
+        Log.e(lastErr, "session: gave up after %d attempts", BACKOFF_MS.length);
+        Throwable err = lastErr;
+        synchronized (this) {
+            if (stopped) return false;
+            stopped = true;
+            tearDownInstalled();
+        }
+        if (listener != null) {
+            listener.onError(err);
+            listener.onStopped();
+        }
+        return false;
+    }
+
+    // Build everything into locals first. Then install + start under the
+    // monitor - but only if stop() hasn't already fired, in which case
+    // we tear down the locals we just built so nothing leaks.
+    private void bringUp() throws Exception {
+        Log.i("session: connect %s:%d", target.host, target.port);
+        adb.disconnect();
+        if (!adb.connect(target.host, target.port)) {
+            throw new IOException("adb connect returned false");
+        }
+        Log.i("adb connect ok");
+
+        Server srv = new Server(ctx, adb);
+        Server.Streams s = srv.bringUp();
+
+        ControlStream cs = new ControlStream(s.controlIn, s.controlOut);
+        Controller ctrl = new Controller(ctx, cs::send);
+        cs.setInboundSink(ctrl);
+
+        AudioSink   ak = new AudioSink();
+        AudioStream as = new AudioStream(s.audioIn, ak);
+
+        VideoSink   vk = new VideoSink(surface);
+        final Controller ctrlRef = ctrl; // capture for SizeListener
+        AtomicBoolean reported = new AtomicBoolean();
+        VideoStream vs = new VideoStream(s.videoIn, vk, (w, h) -> {
+            ctrlRef.setTargetSize(w, h);
+            if (reported.compareAndSet(false, true) && listener != null) {
+                listener.onConnected(w, h);
+            }
+        });
+        vs.setOnEnd(this::onVideoEnded);
+        MuxRecorder rec = new MuxRecorder();
+        vs.setRecorder(rec);
+
+        synchronized (this) {
+            if (stopped) {
+                tearDownLocals(srv, cs, ctrl, ak, as, vk, vs, rec);
+                throw new IOException("session: stopped during bring-up");
+            }
+            server        = srv;
+            controlStream = cs;
+            controller    = ctrl;
+            audioSink     = ak;
+            audioStream   = as;
+            videoSink     = vk;
+            videoStream   = vs;
+            recorder      = rec;
+            if (pendingViewW > 0) ctrl.setViewSize(pendingViewW, pendingViewH);
+        }
+
+        cs.start();
+        as.start();
+        vs.start();
+    }
+
+    // Fired on the video-reader thread when its read loop exits (EOF,
+    // error, or stop()). The video socket is the authoritative stream;
+    // its end wakes the supervisor, which either unwinds (stop) or
+    // reconnects. A no-op countdown after stop() is harmless.
+    private void onVideoEnded() {
+        endSignal.countDown();
+    }
+
+    private synchronized void tearDownInstalled() {
+        tearDownLocals(server, controlStream, controller,
+                       audioSink, audioStream, videoSink, videoStream, recorder);
+        server = null;
+        controlStream = null;
+        controller = null;
+        audioSink = null;
+        audioStream = null;
+        videoSink = null;
+        videoStream = null;
+        recorder = null;
+        try { adb.disconnect(); } catch (Exception ignored) {}
+    }
+
+    private static void tearDownLocals(Server srv, ControlStream cs, Controller ctrl,
+                                       AudioSink ak, AudioStream as,
+                                       VideoSink vk, VideoStream vs, MuxRecorder rec) {
+        if (rec != null) rec.close();
+        if (vs != null) vs.stop();
+        if (vk != null) vk.release();
+        if (as != null) as.stop();
+        if (ak != null) ak.release();
+        if (cs != null) cs.stop();
+        if (ctrl != null) ctrl.release();
+        if (srv != null) srv.close();
+    }
+}
diff --git a/app/src/main/java/invalid/lena/scrcpy/Sessions.java b/app/src/main/java/invalid/lena/scrcpy/Sessions.java
new file mode 100644
index 0000000..95c0a1f
--- /dev/null
+++ b/app/src/main/java/invalid/lena/scrcpy/Sessions.java
@@ -0,0 +1,75 @@
+package invalid.lena.scrcpy;
+
+import android.app.Notification;
+import android.app.NotificationChannel;
+import android.app.NotificationManager;
+import android.app.PendingIntent;
+import android.app.Service;
+import android.content.Intent;
+import android.content.pm.ServiceInfo;
+import android.os.IBinder;
+
+// Foreground service whose only job is to keep the app process alive
+// while the user is mirroring. Mirror starts it on entry and stops it
+// in onDestroy; the running foreground service (with its notification)
+// is what keeps the OOM killer away, so the activity can survive being
+// briefly backgrounded (rotation, IME, swipe-to-home) without the
+// scrcpy server tearing down.
+//
+// Type is FOREGROUND_SERVICE_DATA_SYNC: we are pulling a continuous
+// data stream (encoded video + raw PCM) from another device.
+//
+// No binder API - the service does not own Session. Mirror owns it.
+public final class Sessions extends Service {
+
+    private static final String CHANNEL_ID = "scrcpy-android-session";
+    private static final int    NOTIF_ID   = 1;
+
+    @Override
+    public void onCreate() {
+        super.onCreate();
+        Log.i("sessions: onCreate");
+    }
+
+    @Override
+    public int onStartCommand(Intent intent, int flags, int startId) {
+        ensureChannel();
+        Notification n = new Notification.Builder(this, CHANNEL_ID)
+                .setSmallIcon(R.drawable.ic_notification)
+                .setContentTitle(getString(R.string.app_name))
+                .setContentText(getString(R.string.notif_session_active))
+                .setContentIntent(reopenIntent())
+                .setOngoing(true)
+                .build();
+        startForeground(NOTIF_ID, n, ServiceInfo.FOREGROUND_SERVICE_TYPE_DATA_SYNC);
+        return START_NOT_STICKY;
+    }
+
+    @Override
+    public IBinder onBind(Intent intent) {
+        return null;
+    }
+
+    @Override
+    public void onDestroy() {
+        Log.i("sessions: onDestroy");
+        super.onDestroy();
+    }
+
+    private void ensureChannel() {
+        NotificationManager nm = getSystemService(NotificationManager.class);
+        if (nm.getNotificationChannel(CHANNEL_ID) != null) return;
+        NotificationChannel ch = new NotificationChannel(
+                CHANNEL_ID, getString(R.string.app_name),
+                NotificationManager.IMPORTANCE_LOW);
+        ch.setDescription(getString(R.string.notif_session_active));
+        nm.createNotificationChannel(ch);
+    }
+
+    private PendingIntent reopenIntent() {
+        Intent i = new Intent(this, Main.class);
+        i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TOP);
+        return PendingIntent.getActivity(this, 0, i,
+                PendingIntent.FLAG_IMMUTABLE | PendingIntent.FLAG_UPDATE_CURRENT);
+    }
+}
diff --git a/app/src/main/java/invalid/lena/scrcpy/Settings.java b/app/src/main/java/invalid/lena/scrcpy/Settings.java
new file mode 100644
index 0000000..c4bb83b
--- /dev/null
+++ b/app/src/main/java/invalid/lena/scrcpy/Settings.java
@@ -0,0 +1,93 @@
+package invalid.lena.scrcpy;
+
+import android.content.Context;
+import android.content.SharedPreferences;
+
+// Thin wrapper around SharedPreferences for the small set of user
+// choices the app exposes. No reactivity, no DataStore - the values
+// are read once when a Session starts and applied to the scrcpy
+// server command line.
+public final class Settings {
+
+    private static final String FILE = "scrcpy-android";
+
+    public static final String VIDEO_CODEC    = "video_codec";
+    public static final String AUDIO_CODEC    = "audio_codec";
+    public static final String MAX_SIZE       = "max_size";        // px, long edge; 0 = no cap
+    public static final String VIDEO_BIT_RATE = "video_bit_rate";  // bits/sec
+    public static final String MAX_FPS        = "max_fps";         // fps; 0 = unlimited
+    public static final String HINT_BACK_SHOWN = "hint_back_shown"; // first-run UI hint
+    public static final String STATUS_BAR      = "status_bar";      // show status bar while mirroring
+
+    public static final String DEFAULT_VIDEO_CODEC    = "h264";
+    public static final String DEFAULT_AUDIO_CODEC    = "raw";
+    public static final int    DEFAULT_MAX_SIZE       = 0;
+    public static final int    DEFAULT_VIDEO_BIT_RATE = 8_000_000;
+    public static final int    DEFAULT_MAX_FPS        = 0;
+    // Hidden while mirroring by default: an always-on bar over the video
+    // is intrusive. It still auto-shows when not CONNECTED so Reconnect
+    // stays reachable. Record lives in the bar, so enable this to keep it.
+    public static final boolean DEFAULT_STATUS_BAR    = false;
+
+    private Settings() {}
+
+    public static SharedPreferences prefs(Context ctx) {
+        return ctx.getApplicationContext().getSharedPreferences(FILE, Context.MODE_PRIVATE);
+    }
+
+    public static String videoCodec(Context ctx) {
+        return prefs(ctx).getString(VIDEO_CODEC, DEFAULT_VIDEO_CODEC);
+    }
+
+    public static String audioCodec(Context ctx) {
+        return prefs(ctx).getString(AUDIO_CODEC, DEFAULT_AUDIO_CODEC);
+    }
+
+    public static int maxSize(Context ctx) {
+        return prefs(ctx).getInt(MAX_SIZE, DEFAULT_MAX_SIZE);
+    }
+
+    public static int videoBitRate(Context ctx) {
+        return prefs(ctx).getInt(VIDEO_BIT_RATE, DEFAULT_VIDEO_BIT_RATE);
+    }
+
+    public static int maxFps(Context ctx) {
+        return prefs(ctx).getInt(MAX_FPS, DEFAULT_MAX_FPS);
+    }
+
+    public static void setVideoCodec(Context ctx, String v) {
+        prefs(ctx).edit().putString(VIDEO_CODEC, v).apply();
+    }
+
+    public static void setAudioCodec(Context ctx, String a) {
+        prefs(ctx).edit().putString(AUDIO_CODEC, a).apply();
+    }
+
+    public static void setMaxSize(Context ctx, int v) {
+        prefs(ctx).edit().putInt(MAX_SIZE, v).apply();
+    }
+
+    public static void setVideoBitRate(Context ctx, int v) {
+        prefs(ctx).edit().putInt(VIDEO_BIT_RATE, v).apply();
+    }
+
+    public static void setMaxFps(Context ctx, int v) {
+        prefs(ctx).edit().putInt(MAX_FPS, v).apply();
+    }
+
+    public static boolean hintBackShown(Context ctx) {
+        return prefs(ctx).getBoolean(HINT_BACK_SHOWN, false);
+    }
+
+    public static void setHintBackShown(Context ctx, boolean v) {
+        prefs(ctx).edit().putBoolean(HINT_BACK_SHOWN, v).apply();
+    }
+
+    public static boolean showStatusBar(Context ctx) {
+        return prefs(ctx).getBoolean(STATUS_BAR, DEFAULT_STATUS_BAR);
+    }
+
+    public static void setShowStatusBar(Context ctx, boolean v) {
+        prefs(ctx).edit().putBoolean(STATUS_BAR, v).apply();
+    }
+}
diff --git a/app/src/main/java/invalid/lena/scrcpy/SettingsActivity.java b/app/src/main/java/invalid/lena/scrcpy/SettingsActivity.java
new file mode 100644
index 0000000..d95ecba
--- /dev/null
+++ b/app/src/main/java/invalid/lena/scrcpy/SettingsActivity.java
@@ -0,0 +1,110 @@
+package invalid.lena.scrcpy;
+
+import android.app.Activity;
+import android.os.Bundle;
+import android.widget.CheckBox;
+import android.widget.RadioButton;
+import android.widget.RadioGroup;
+
+// Codec choice + streaming knobs. All persisted to SharedPreferences
+// via Settings on click; the next session bringup reads them and
+// applies to the scrcpy server cmdline.
+public final class SettingsActivity extends Activity {
+
+    @Override
+    protected void onCreate(Bundle saved) {
+        super.onCreate(saved);
+        setContentView(R.layout.settings);
+        setTitle(R.string.settings);
+
+        RadioGroup videoGroup   = findViewById(R.id.video_codec);
+        RadioGroup audioGroup   = findViewById(R.id.audio_codec);
+        RadioGroup maxSizeGroup = findViewById(R.id.max_size);
+        RadioGroup bitRateGroup = findViewById(R.id.video_bit_rate);
+        RadioGroup maxFpsGroup  = findViewById(R.id.max_fps);
+        CheckBox   statusBarBox = findViewById(R.id.show_status_bar);
+
+        switch (Settings.videoCodec(this)) {
+            case "h265": ((RadioButton) findViewById(R.id.video_h265)).setChecked(true); break;
+            case "av1":  ((RadioButton) findViewById(R.id.video_av1)).setChecked(true);  break;
+            default:     ((RadioButton) findViewById(R.id.video_h264)).setChecked(true);
+        }
+        switch (Settings.audioCodec(this)) {
+            case "opus": ((RadioButton) findViewById(R.id.audio_opus)).setChecked(true); break;
+            default:     ((RadioButton) findViewById(R.id.audio_raw)).setChecked(true);
+        }
+        switch (Settings.maxSize(this)) {
+            case 480:  ((RadioButton) findViewById(R.id.max_size_480)).setChecked(true); break;
+            case 720:  ((RadioButton) findViewById(R.id.max_size_720)).setChecked(true); break;
+            case 1080: ((RadioButton) findViewById(R.id.max_size_1080)).setChecked(true); break;
+            case 1440: ((RadioButton) findViewById(R.id.max_size_1440)).setChecked(true); break;
+            case 2160: ((RadioButton) findViewById(R.id.max_size_2160)).setChecked(true); break;
+            default:   ((RadioButton) findViewById(R.id.max_size_0)).setChecked(true);
+        }
+        switch (Settings.videoBitRate(this)) {
+            case 1_000_000:  ((RadioButton) findViewById(R.id.bit_rate_1m)).setChecked(true);  break;
+            case 2_000_000:  ((RadioButton) findViewById(R.id.bit_rate_2m)).setChecked(true);  break;
+            case 4_000_000:  ((RadioButton) findViewById(R.id.bit_rate_4m)).setChecked(true);  break;
+            case 16_000_000: ((RadioButton) findViewById(R.id.bit_rate_16m)).setChecked(true); break;
+            default:         ((RadioButton) findViewById(R.id.bit_rate_8m)).setChecked(true);
+        }
+        switch (Settings.maxFps(this)) {
+            case 30:  ((RadioButton) findViewById(R.id.max_fps_30)).setChecked(true);  break;
+            case 60:  ((RadioButton) findViewById(R.id.max_fps_60)).setChecked(true);  break;
+            case 90:  ((RadioButton) findViewById(R.id.max_fps_90)).setChecked(true);  break;
+            case 120: ((RadioButton) findViewById(R.id.max_fps_120)).setChecked(true); break;
+            default:  ((RadioButton) findViewById(R.id.max_fps_0)).setChecked(true);
+        }
+
+        videoGroup.setOnCheckedChangeListener((g, id) -> {
+            String v = "h264";
+            if (id == R.id.video_h265) v = "h265";
+            else if (id == R.id.video_av1) v = "av1";
+            Settings.setVideoCodec(this, v);
+            Log.i("settings: video_codec=%s", v);
+        });
+
+        audioGroup.setOnCheckedChangeListener((g, id) -> {
+            String a = id == R.id.audio_opus ? "opus" : "raw";
+            Settings.setAudioCodec(this, a);
+            Log.i("settings: audio_codec=%s", a);
+        });
+
+        maxSizeGroup.setOnCheckedChangeListener((g, id) -> {
+            int v = 0;
+            if      (id == R.id.max_size_480)  v = 480;
+            else if (id == R.id.max_size_720)  v = 720;
+            else if (id == R.id.max_size_1080) v = 1080;
+            else if (id == R.id.max_size_1440) v = 1440;
+            else if (id == R.id.max_size_2160) v = 2160;
+            Settings.setMaxSize(this, v);
+            Log.i("settings: max_size=%d", v);
+        });
+
+        bitRateGroup.setOnCheckedChangeListener((g, id) -> {
+            int v = Settings.DEFAULT_VIDEO_BIT_RATE;
+            if      (id == R.id.bit_rate_1m)  v = 1_000_000;
+            else if (id == R.id.bit_rate_2m)  v = 2_000_000;
+            else if (id == R.id.bit_rate_4m)  v = 4_000_000;
+            else if (id == R.id.bit_rate_16m) v = 16_000_000;
+            Settings.setVideoBitRate(this, v);
+            Log.i("settings: video_bit_rate=%d", v);
+        });
+
+        maxFpsGroup.setOnCheckedChangeListener((g, id) -> {
+            int v = 0;
+            if      (id == R.id.max_fps_30)  v = 30;
+            else if (id == R.id.max_fps_60)  v = 60;
+            else if (id == R.id.max_fps_90)  v = 90;
+            else if (id == R.id.max_fps_120) v = 120;
+            Settings.setMaxFps(this, v);
+            Log.i("settings: max_fps=%d", v);
+        });
+
+        statusBarBox.setChecked(Settings.showStatusBar(this));
+        statusBarBox.setOnCheckedChangeListener((b, checked) -> {
+            Settings.setShowStatusBar(this, checked);
+            Log.i("settings: status_bar=%b", checked);
+        });
+    }
+}
diff --git a/app/src/main/java/invalid/lena/scrcpy/Sync.java b/app/src/main/java/invalid/lena/scrcpy/Sync.java
new file mode 100644
index 0000000..6e37523
--- /dev/null
+++ b/app/src/main/java/invalid/lena/scrcpy/Sync.java
@@ -0,0 +1,78 @@
+package invalid.lena.scrcpy;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.nio.charset.StandardCharsets;
+
+// Pure-java adb sync v1 SEND framing. Extracted from Server.push() so
+// it can be unit-tested without an AdbStream or any android coupling.
+//
+// Layout on the wire (little-endian uint32 lengths):
+//   "SEND" | u32(len(path,mode)) | path,mode
+//   "DATA" | u32(chunk_size)     | chunk_bytes      (repeats, chunk <= 64K)
+//   "DONE" | u32(mtime_seconds)
+//   ----> response:
+//   "OKAY" | u32(0)
+//     or
+//   "FAIL" | u32(msg_len) | msg
+public final class Sync {
+
+    public static final int CHUNK = 64 * 1024;
+
+    // FAIL responses carry a short human-readable message; cap what a
+    // corrupt or hostile length field can make us allocate.
+    private static final int MAX_FAIL_MSG = 4 * 1024;
+
+    private Sync() {}
+
+    // Push `src` to `remotePath` with the given mode and mtime, using the
+    // already-open `out` and `in` of an adb sync stream. Returns the
+    // total payload byte count.
+    public static long push(InputStream src, OutputStream out, InputStream in,
+                            String remotePath, int mode, int mtimeSec)
+            throws IOException {
+        String header = remotePath + "," + mode;
+        byte[] hb = header.getBytes(StandardCharsets.UTF_8);
+
+        byte[] tag = new byte[8];
+        putTag(tag, 0, "SEND");
+        Wire.writeLe32(tag, 4, hb.length);
+        out.write(tag);
+        out.write(hb);
+
+        byte[] chunk = new byte[CHUNK];
+        byte[] dataHdr = new byte[8];
+        putTag(dataHdr, 0, "DATA");
+        long total = 0;
+        int n;
+        while ((n = src.read(chunk)) > 0) {
+            Wire.writeLe32(dataHdr, 4, n);
+            out.write(dataHdr);
+            out.write(chunk, 0, n);
+            total += n;
+        }
+
+        byte[] done = new byte[8];
+        putTag(done, 0, "DONE");
+        Wire.writeLe32(done, 4, mtimeSec);
+        out.write(done);
+        out.flush();
+
+        byte[] resp = new byte[8];
+        Wire.readFully(in, resp);
+        String code = new String(resp, 0, 4, StandardCharsets.US_ASCII);
+        int len = Wire.readLe32(resp, 4);
+        if ("OKAY".equals(code)) return total;
+
+        byte[] msg = new byte[Math.min(Math.max(0, len), MAX_FAIL_MSG)];
+        if (msg.length > 0) Wire.readFully(in, msg);
+        throw new IOException("sync " + code + ": "
+                + new String(msg, StandardCharsets.UTF_8));
+    }
+
+    private static void putTag(byte[] dst, int off, String tag) {
+        byte[] b = tag.getBytes(StandardCharsets.US_ASCII);
+        System.arraycopy(b, 0, dst, off, 4);
+    }
+}
diff --git a/app/src/main/java/invalid/lena/scrcpy/VideoFrames.java b/app/src/main/java/invalid/lena/scrcpy/VideoFrames.java
new file mode 100644
index 0000000..cfffe90
--- /dev/null
+++ b/app/src/main/java/invalid/lena/scrcpy/VideoFrames.java
@@ -0,0 +1,17 @@
+package invalid.lena.scrcpy;
+
+import java.io.IOException;
+
+// Sink for parsed video frames. VideoSink is the only production
+// implementation; tests use a recording stub. Kept android-free so
+// it can be referenced from JVM-only test code.
+public interface VideoFrames {
+
+    void configure(int codecFourcc, int width, int height) throws IOException;
+
+    void reconfigure(int codecFourcc, int width, int height) throws IOException;
+
+    void feed(byte[] data, long ptsUs, boolean isConfig);
+
+    void release();
+}
diff --git a/app/src/main/java/invalid/lena/scrcpy/VideoRecorder.java b/app/src/main/java/invalid/lena/scrcpy/VideoRecorder.java
new file mode 100644
index 0000000..98a5ca9
--- /dev/null
+++ b/app/src/main/java/invalid/lena/scrcpy/VideoRecorder.java
@@ -0,0 +1,19 @@
+package invalid.lena.scrcpy;
+
+// Optional tap on VideoStream. Receives the same frames the decoder
+// gets - same bytes, same order - plus the keyframe bit so a downstream
+// muxer can mark random-access samples. Android-free so VideoStream
+// stays unit-testable; MuxRecorder is the concrete Android impl.
+//
+// Wire order:
+//   onMeta(fourcc, w, h)        - once per session, again on resize
+//   onFrame(data, pts, cfg, key) - for every frame
+//   close()                      - when the stream tears down
+public interface VideoRecorder {
+
+    void onMeta(int codecFourcc, int width, int height);
+
+    void onFrame(byte[] data, long ptsUs, boolean isConfig, boolean isKeyframe);
+
+    void close();
+}
diff --git a/app/src/main/java/invalid/lena/scrcpy/VideoSink.java b/app/src/main/java/invalid/lena/scrcpy/VideoSink.java
new file mode 100644
index 0000000..fa8248b
--- /dev/null
+++ b/app/src/main/java/invalid/lena/scrcpy/VideoSink.java
@@ -0,0 +1,244 @@
+package invalid.lena.scrcpy;
+
+import android.media.MediaCodec;
+import android.media.MediaFormat;
+import android.os.Handler;
+import android.os.HandlerThread;
+import android.view.Surface;
+
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.util.ArrayDeque;
+import java.util.Deque;
+import java.util.Iterator;
+
+// MediaCodec async-mode video decoder writing to a Surface.
+//
+// MediaCodec hands us input buffer indices on its callback handler;
+// VideoStream pushes encoded frames at us synchronously. The two ends
+// meet through a small queue of pending frames waiting for input buffers,
+// plus a corresponding pool of free input buffer indices.
+//
+// Back-pressure policy: when both queues fill, drop the *next* incoming
+// frame unless it is a config or keyframe (we have no way to know its
+// type from outside). For v1 we simply drop oldest pending non-keyframes
+// if the pending queue grows past a small bound.
+//
+// Output timing: releaseOutputBuffer is called with an absolute nano
+// timestamp on the System.nanoTime clock, derived from the wire PTS so
+// the surface composer interpolates frames against vsync instead of
+// rendering them as fast as they decode. Anchor is set on the first
+// frame: wallClockNs0 - ptsUs0 * 1000 = constant offset, then for each
+// subsequent buffer renderAt = ptsUs * 1000 + offset.
+public final class VideoSink implements VideoFrames {
+
+    private static final int MAX_PENDING = 8;
+
+    private volatile Surface surface;
+    public  volatile long    frames; // public read for the status overlay
+    private MediaCodec codec;
+    private HandlerThread handlerThread;
+    private Handler handler;
+
+    private final Object lock = new Object();
+    private final Deque<Integer> freeInputs = new ArrayDeque<>(16);
+    private final Deque<Frame>   pending    = new ArrayDeque<>(MAX_PENDING);
+
+    private boolean released;
+    private long    ptsOffsetNs;  // wall-ns = ptsUs * 1000 + ptsOffsetNs
+    private boolean ptsAnchored;
+
+    private static final class Frame {
+        final byte[] data;
+        final long   ptsUs;
+        final boolean isConfig;
+        Frame(byte[] d, long pts, boolean cfg) { data = d; ptsUs = pts; isConfig = cfg; }
+    }
+
+    public VideoSink(Surface surface) {
+        this.surface = surface;
+    }
+
+    // Swap the output Surface without rebuilding MediaCodec. Passing null
+    // detaches output: the codec keeps decoding but discards frames so the
+    // wire stays drained while the activity is backgrounded. Passing a new
+    // Surface re-attaches and rendering resumes from the next decoded frame.
+    public void setOutputSurface(Surface newSurface) {
+        synchronized (lock) {
+            if (released) return;
+            this.surface = newSurface;
+            MediaCodec c = codec;
+            if (c == null) return; // not yet configured; new surface will be used at configure time
+            try {
+                if (newSurface != null) c.setOutputSurface(newSurface);
+                // Calling setOutputSurface(null) is unsupported on some
+                // codecs; instead, ignore output buffers in the callback
+                // when surface is null (see onOutputBufferAvailable).
+            } catch (IllegalStateException e) {
+                Log.w("video sink: setOutputSurface: %s", e);
+            }
+            // Re-anchor PTS so frames decoded against the old surface clock
+            // don't drag the new surface's render time into the past.
+            ptsAnchored = false;
+        }
+    }
+
+    @Override
+    public void configure(int codecFourcc, int width, int height) throws IOException {
+        String mime = mimeFor(codecFourcc);
+        if (mime == null) throw new IOException("unsupported video codec " + Wire.fourccName(codecFourcc));
+        Log.i("video sink: configure mime=%s %dx%d", mime, width, height);
+
+        handlerThread = new HandlerThread("video-mc");
+        handlerThread.start();
+        handler = new Handler(handlerThread.getLooper());
+
+        codec = MediaCodec.createDecoderByType(mime);
+        codec.setCallback(new MediaCodec.Callback() {
+            @Override public void onInputBufferAvailable(MediaCodec mc, int idx) {
+                onFreeInput(idx);
+            }
+            @Override public void onOutputBufferAvailable(MediaCodec mc, int idx, MediaCodec.BufferInfo info) {
+                try {
+                    if (surface == null) {
+                        // Activity backgrounded - discard output instead
+                        // of rendering to a dead surface.
+                        mc.releaseOutputBuffer(idx, false);
+                        return;
+                    }
+                    // PTS-honoured render: SurfaceFlinger queues the buffer
+                    // for renderTimestampNs and interpolates against vsync,
+                    // so bursty arrivals smooth out instead of judder.
+                    // Config frames (pts=0) fall through to render-immediately.
+                    long renderAtNs = renderTimeNs(info.presentationTimeUs);
+                    if (renderAtNs == 0L) mc.releaseOutputBuffer(idx, true);
+                    else                  mc.releaseOutputBuffer(idx, renderAtNs);
+                } catch (IllegalStateException ignored) {}
+            }
+            @Override public void onError(MediaCodec mc, MediaCodec.CodecException e) {
+                Log.e(e, "video sink: codec error");
+            }
+            @Override public void onOutputFormatChanged(MediaCodec mc, MediaFormat fmt) {
+                Log.i("video sink: output format %s", fmt);
+            }
+        }, handler);
+
+        MediaFormat fmt = MediaFormat.createVideoFormat(mime, width, height);
+        codec.configure(fmt, surface, null, 0);
+        codec.start();
+    }
+
+    // Called by VideoStream for every encoded frame, in order.
+    @Override
+    public void feed(byte[] data, long ptsUs, boolean isConfig) {
+        if (!isConfig) frames++;
+        synchronized (lock) {
+            if (released) return;
+            // Try to drain immediately if there's a free input.
+            while (!pending.isEmpty() && !freeInputs.isEmpty()) {
+                submit(pending.pollFirst(), freeInputs.pollFirst());
+            }
+            if (!freeInputs.isEmpty()) {
+                submit(new Frame(data, ptsUs, isConfig), freeInputs.pollFirst());
+                return;
+            }
+            // Queue, with bounded drop policy on non-config frames.
+            if (pending.size() >= MAX_PENDING && !isConfig) {
+                // Drop the oldest non-config frame to avoid stalling
+                // forever. Config frames must survive: the decoder
+                // cannot start without its CSD.
+                for (Iterator<Frame> it = pending.iterator(); it.hasNext(); ) {
+                    if (!it.next().isConfig) { it.remove(); break; }
+                }
+            }
+            pending.offerLast(new Frame(data, ptsUs, isConfig));
+        }
+    }
+
+    @Override
+    public void release() {
+        synchronized (lock) {
+            if (released) return;
+            released = true;
+        }
+        teardownCodec();
+    }
+
+    // Tear down the current decoder and reconfigure with new dimensions.
+    // The next CSD frame on the wire (server resets on resize) will prime
+    // the new codec instance.
+    @Override
+    public void reconfigure(int codecFourcc, int width, int height) throws IOException {
+        synchronized (lock) {
+            if (released) return;
+        }
+        teardownCodec();
+        synchronized (lock) {
+            freeInputs.clear();
+            pending.clear();
+            ptsAnchored = false; // re-anchor on the first frame of the new run
+        }
+        configure(codecFourcc, width, height);
+    }
+
+    private void teardownCodec() {
+        MediaCodec c = codec;
+        codec = null;
+        HandlerThread ht = handlerThread;
+        handlerThread = null;
+        handler = null;
+        if (c != null) {
+            try { c.stop(); } catch (Exception ignored) {}
+            try { c.release(); } catch (Exception ignored) {}
+        }
+        if (ht != null) ht.quitSafely();
+    }
+
+    // Internal - runs on the MediaCodec callback thread.
+    private void onFreeInput(int idx) {
+        synchronized (lock) {
+            if (released) return;
+            if (!pending.isEmpty()) submit(pending.pollFirst(), idx);
+            else                    freeInputs.offerLast(idx);
+        }
+    }
+
+    // Must be called with `lock` held.
+    private void submit(Frame f, int idx) {
+        try {
+            ByteBuffer buf = codec.getInputBuffer(idx);
+            if (buf == null) return;
+            buf.clear();
+            buf.put(f.data);
+            int flags = f.isConfig ? MediaCodec.BUFFER_FLAG_CODEC_CONFIG : 0;
+            codec.queueInputBuffer(idx, 0, f.data.length, f.ptsUs, flags);
+        } catch (IllegalStateException e) {
+            Log.w("video sink: queueInputBuffer: %s", e);
+        }
+    }
+
+    // Convert a wire PTS (microseconds since some scrcpy epoch) into a
+    // System.nanoTime value the surface composer should render at.
+    // First call anchors the offset to "now" so latency stays whatever
+    // the wire produced. PTS=0 (config frames) and unanchored state
+    // both return 0 → caller falls back to render-immediately.
+    private long renderTimeNs(long ptsUs) {
+        if (ptsUs <= 0L) return 0L;
+        synchronized (lock) {
+            if (!ptsAnchored) {
+                ptsOffsetNs = System.nanoTime() - ptsUs * 1000L;
+                ptsAnchored = true;
+            }
+            return ptsUs * 1000L + ptsOffsetNs;
+        }
+    }
+
+    private static String mimeFor(int fourcc) {
+        switch (fourcc) {
+            case Wire.CODEC_H264: return MediaFormat.MIMETYPE_VIDEO_AVC;
+            case Wire.CODEC_H265: return MediaFormat.MIMETYPE_VIDEO_HEVC;
+            case Wire.CODEC_AV1:  return MediaFormat.MIMETYPE_VIDEO_AV1;
+            default: return null;
+        }
+    }
+}
diff --git a/app/src/main/java/invalid/lena/scrcpy/VideoStream.java b/app/src/main/java/invalid/lena/scrcpy/VideoStream.java
new file mode 100644
index 0000000..4eb62d3
--- /dev/null
+++ b/app/src/main/java/invalid/lena/scrcpy/VideoStream.java
@@ -0,0 +1,156 @@
+package invalid.lena.scrcpy;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+// Reads the scrcpy video socket and drives a VideoFrames sink.
+//
+// Wire format (big-endian, scrcpy 3.x/4.x):
+//   1) Stream meta:    uint32 fourcc
+//                      special values 0 = disabled, 1 = error
+//   2) Then a stream of variable packets. Each packet starts with 4 bytes
+//      that disambiguate the type:
+//      a) Session meta (12 bytes total): uint32 flags(bit31=1) | uint32 w | uint32 h
+//         flags bit0 = client-resize.  May recur on rotation.
+//      b) Frame header (12 bytes total): uint64 ptsAndFlags | uint32 size
+//         ptsAndFlags top bits:
+//             bit 63 = SESSION  (never set in frame headers)
+//             bit 62 = CONFIG   (CSD, e.g. SPS/PPS for h264)
+//             bit 61 = KEYFRAME
+//             rest   = pts microseconds
+//         followed by `size` bytes of encoded payload.
+//
+// The constructor takes a plain InputStream so this class is
+// android-free and unit-testable. The caller owns stream lifecycle
+// (close it to unblock reads on stop()).
+public final class VideoStream {
+
+    public interface SizeListener { void onSize(int w, int h); }
+
+    private static final long FLAG_SESSION  = 1L << 63;
+    private static final long FLAG_CONFIG   = 1L << 62;
+    private static final long FLAG_KEYFRAME = 1L << 61;
+    private static final long PTS_MASK      = ~(FLAG_SESSION | FLAG_CONFIG | FLAG_KEYFRAME);
+    private static final int  FLAG_SESSION_INT_BIT = 0x80000000;
+
+    private static final int MAX_FRAME_SIZE = 8 * 1024 * 1024;
+
+    private final InputStream  source;
+    private final VideoFrames  sink;
+    private final SizeListener sizeListener;
+    private volatile VideoRecorder recorder; // optional tap
+    private volatile Runnable  onEnd;        // fired once when run() exits
+    private Thread             thread;
+    private volatile boolean   stop;
+
+    // Parser state held across packets in run().
+    private int     fourcc;
+    private boolean configured;
+    private int     curW, curH;
+
+    public VideoStream(InputStream source, VideoFrames sink, SizeListener sizeListener) {
+        this.source = source;
+        this.sink = sink;
+        this.sizeListener = sizeListener;
+    }
+
+    public void start() {
+        thread = new Thread(this::run, "video-reader");
+        thread.start();
+    }
+
+    public void stop() {
+        stop = true;
+        if (thread != null) thread.interrupt();
+    }
+
+    public void setRecorder(VideoRecorder r) {
+        this.recorder = r;
+    }
+
+    // Fired exactly once, on the reader thread, when run() exits - whether
+    // by EOF, error, or stop(). The video socket is the authoritative
+    // stream: when it ends mid-session the link is gone, so Session uses
+    // this to surface a disconnect to the UI instead of freezing.
+    public void setOnEnd(Runnable r) {
+        this.onEnd = r;
+    }
+
+    // Visible for tests: parse the same way the thread does, on the caller's thread.
+    public void run() {
+        try {
+            byte[] four = new byte[4];
+            Wire.readFully(source, four);
+            fourcc = Wire.readBe32(four, 0);
+            if (fourcc == 0)  throw new IOException("video: server reports stream disabled");
+            if (fourcc == 1)  throw new IOException("video: server reports configuration error");
+            Log.i("video meta codec=%s", Wire.fourccName(fourcc));
+
+            byte[] tail8 = new byte[8];
+            long frames = 0;
+
+            while (!stop) {
+                Wire.readFully(source, four);
+                int hi = Wire.readBe32(four, 0);
+
+                if ((hi & FLAG_SESSION_INT_BIT) != 0) {
+                    parseSessionMeta(hi, tail8);
+                } else {
+                    parseFrame(hi, tail8);
+                    if (++frames == 1) Log.i("video frame n=1");
+                }
+            }
+        } catch (IOException e) {
+            if (!stop) Log.e(e, "video reader");
+        } catch (Exception e) {
+            Log.e(e, "video reader unexpected");
+        } finally {
+            Log.i("video reader: end");
+            Runnable r = onEnd;
+            if (r != null) r.run();
+        }
+    }
+
+    private void parseSessionMeta(int hi, byte[] tail8) throws IOException {
+        Wire.readFully(source, tail8);
+        int newW = Wire.readBe32(tail8, 0);
+        int newH = Wire.readBe32(tail8, 4);
+        boolean clientResize = (hi & 1) != 0;
+        Log.i("video session meta %dx%d client_resize=%s", newW, newH, clientResize);
+
+        if (!configured) {
+            curW = newW; curH = newH;
+            sink.configure(fourcc, curW, curH);
+            configured = true;
+        } else if (newW != curW || newH != curH) {
+            Log.i("video resize %dx%d -> %dx%d", curW, curH, newW, newH);
+            curW = newW; curH = newH;
+            sink.reconfigure(fourcc, curW, curH);
+        }
+        if (sizeListener != null) sizeListener.onSize(curW, curH);
+        VideoRecorder r = recorder;
+        if (r != null) r.onMeta(fourcc, curW, curH);
+    }
+
+    private void parseFrame(int hi, byte[] tail8) throws IOException {
+        Wire.readFully(source, tail8);
+        long pts = ((long) hi << 32) | (Wire.readBe32(tail8, 0) & 0xffffffffL);
+        int  size = Wire.readBe32(tail8, 4);
+        boolean cfg = (pts & FLAG_CONFIG)   != 0;
+        boolean key = (pts & FLAG_KEYFRAME) != 0;
+        long ptsUs = pts & PTS_MASK;
+
+        if (size <= 0 || size > MAX_FRAME_SIZE) {
+            throw new IOException("video frame size out of range: " + size);
+        }
+        // Validate ordering BEFORE allocating the payload buffer - a
+        // malformed early frame could otherwise OOM on small devices.
+        if (!configured) throw new IOException("video frame before session meta");
+
+        byte[] payload = new byte[size];
+        Wire.readFully(source, payload);
+        sink.feed(payload, ptsUs, cfg);
+        VideoRecorder r = recorder;
+        if (r != null) r.onFrame(payload, ptsUs, cfg, key);
+    }
+}
diff --git a/app/src/main/java/invalid/lena/scrcpy/Wire.java b/app/src/main/java/invalid/lena/scrcpy/Wire.java
new file mode 100644
index 0000000..7ed6c6a
--- /dev/null
+++ b/app/src/main/java/invalid/lena/scrcpy/Wire.java
@@ -0,0 +1,99 @@
+package invalid.lena.scrcpy;
+
+import java.io.EOFException;
+import java.io.IOException;
+import java.io.InputStream;
+
+// Byte-order helpers used everywhere we touch raw streams.
+//
+// scrcpy server framing is big-endian (java standard).
+// adb sync framing is little-endian (legacy).
+//
+// FOURCCs are read as a big-endian uint32, which matches the literal
+// 4-char ASCII tag, so '"h264"' becomes 0x68323634.
+public final class Wire {
+
+    private Wire() {}
+
+    // ---- big-endian (scrcpy) ----
+
+    public static int readBe32(byte[] b, int off) {
+        return ((b[off]     & 0xff) << 24)
+             | ((b[off + 1] & 0xff) << 16)
+             | ((b[off + 2] & 0xff) <<  8)
+             |  (b[off + 3] & 0xff);
+    }
+
+    public static long readBe64(byte[] b, int off) {
+        return ((long)(readBe32(b, off)) << 32) | (readBe32(b, off + 4) & 0xffffffffL);
+    }
+
+    public static void writeBe32(byte[] b, int off, int v) {
+        b[off]     = (byte)(v >>> 24);
+        b[off + 1] = (byte)(v >>> 16);
+        b[off + 2] = (byte)(v >>>  8);
+        b[off + 3] = (byte) v;
+    }
+
+    public static void writeBe64(byte[] b, int off, long v) {
+        writeBe32(b, off,     (int)(v >>> 32));
+        writeBe32(b, off + 4, (int) v);
+    }
+
+    // ---- little-endian (adb sync) ----
+
+    public static int readLe32(byte[] b, int off) {
+        return  (b[off]     & 0xff)
+             | ((b[off + 1] & 0xff) <<  8)
+             | ((b[off + 2] & 0xff) << 16)
+             | ((b[off + 3] & 0xff) << 24);
+    }
+
+    public static void writeLe32(byte[] b, int off, int v) {
+        b[off]     = (byte) v;
+        b[off + 1] = (byte)(v >>>  8);
+        b[off + 2] = (byte)(v >>> 16);
+        b[off + 3] = (byte)(v >>> 24);
+    }
+
+    // ---- I/O helpers ----
+
+    public static void readFully(InputStream in, byte[] buf, int off, int len) throws IOException {
+        int got = 0;
+        while (got < len) {
+            int n = in.read(buf, off + got, len - got);
+            if (n < 0) throw new EOFException(
+                    "short read: wanted " + len + " got " + got);
+            got += n;
+        }
+    }
+
+    public static void readFully(InputStream in, byte[] buf) throws IOException {
+        readFully(in, buf, 0, buf.length);
+    }
+
+    // scrcpy codec identifiers, mirrored from com.genymobile.scrcpy.{video,audio}.*Codec.
+    // Short names (raw, aac) are NUL-padded on the left, not space-padded on the right.
+    // Declared as int-literal constants so they can drive switch-case labels.
+    public static final int CODEC_H264 = 0x68_32_36_34; // 'h264'
+    public static final int CODEC_H265 = 0x68_32_36_35; // 'h265'
+    public static final int CODEC_AV1  = 0x61_76_30_31; // 'av01'
+    public static final int CODEC_OPUS = 0x6f_70_75_73; // 'opus'
+    public static final int CODEC_FLAC = 0x66_6c_61_63; // 'flac'
+    public static final int CODEC_AAC  = 0x00_61_61_63; // '\0aac'
+    public static final int CODEC_RAW  = 0x00_72_61_77; // '\0raw'
+
+    public static String fourccName(int v) {
+        // Skip any leading NUL bytes - scrcpy left-pads short names like
+        // 'raw' and 'aac' with \0, which would otherwise render as
+        // non-printable characters in logs.
+        char[] cs = new char[]{
+                (char)((v >>> 24) & 0xff),
+                (char)((v >>> 16) & 0xff),
+                (char)((v >>>  8) & 0xff),
+                (char)( v         & 0xff)};
+        int from = 0;
+        while (from < cs.length && cs[from] == 0) from++;
+        return new String(cs, from, cs.length - from);
+    }
+}
diff --git a/app/src/main/res/drawable/bg_card.xml b/app/src/main/res/drawable/bg_card.xml
new file mode 100644
index 0000000..17a0cfa
--- /dev/null
+++ b/app/src/main/res/drawable/bg_card.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Rounded surface panel used to group related controls. -->
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle">
+    <solid android:color="@color/surface"/>
+    <stroke android:width="1dp" android:color="@color/stroke"/>
+    <corners android:radius="@dimen/card_radius"/>
+</shape>
diff --git a/app/src/main/res/drawable/bg_field.xml b/app/src/main/res/drawable/bg_field.xml
new file mode 100644
index 0000000..e656ad4
--- /dev/null
+++ b/app/src/main/res/drawable/bg_field.xml
@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Text-field box. Accent border when focused, neutral otherwise. -->
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:state_focused="true">
+        <shape android:shape="rectangle">
+            <solid android:color="@color/surface_alt"/>
+            <stroke android:width="2dp" android:color="@color/accent"/>
+            <corners android:radius="@dimen/field_radius"/>
+        </shape>
+    </item>
+    <item>
+        <shape android:shape="rectangle">
+            <solid android:color="@color/surface_alt"/>
+            <stroke android:width="1dp" android:color="@color/stroke"/>
+            <corners android:radius="@dimen/field_radius"/>
+        </shape>
+    </item>
+</selector>
diff --git a/app/src/main/res/drawable/bg_status_pill.xml b/app/src/main/res/drawable/bg_status_pill.xml
new file mode 100644
index 0000000..ae91094
--- /dev/null
+++ b/app/src/main/res/drawable/bg_status_pill.xml
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Floating scrim pill behind the Mirror status text and buttons. -->
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle">
+    <solid android:color="@color/status_scrim"/>
+    <corners android:radius="@dimen/button_radius"/>
+</shape>
diff --git a/app/src/main/res/drawable/btn_primary.xml b/app/src/main/res/drawable/btn_primary.xml
new file mode 100644
index 0000000..75aab01
--- /dev/null
+++ b/app/src/main/res/drawable/btn_primary.xml
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Filled accent button with the platform press ripple on top. -->
+<ripple xmlns:android="http://schemas.android.com/apk/res/android"
+    android:color="?android:attr/colorControlHighlight">
+    <item>
+        <shape android:shape="rectangle">
+            <solid android:color="@color/accent"/>
+            <corners android:radius="@dimen/button_radius"/>
+        </shape>
+    </item>
+</ripple>
diff --git a/app/src/main/res/drawable/btn_secondary.xml b/app/src/main/res/drawable/btn_secondary.xml
new file mode 100644
index 0000000..2c3a618
--- /dev/null
+++ b/app/src/main/res/drawable/btn_secondary.xml
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Outlined accent button (transparent fill, accent border). -->
+<ripple xmlns:android="http://schemas.android.com/apk/res/android"
+    android:color="?android:attr/colorControlHighlight">
+    <item>
+        <shape android:shape="rectangle">
+            <solid android:color="@android:color/transparent"/>
+            <stroke android:width="1dp" android:color="@color/accent"/>
+            <corners android:radius="@dimen/button_radius"/>
+        </shape>
+    </item>
+</ripple>
diff --git a/app/src/main/res/drawable/ic_device.xml b/app/src/main/res/drawable/ic_device.xml
new file mode 100644
index 0000000..f12a226
--- /dev/null
+++ b/app/src/main/res/drawable/ic_device.xml
@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Small phone outline used as the leading glyph on saved-device rows. -->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:strokeColor="@color/accent"
+        android:strokeWidth="2"
+        android:strokeLineJoin="round"
+        android:fillColor="#00000000"
+        android:pathData="M8,3 H16 A2,2 0 0 1 18,5 V19 A2,2 0 0 1 16,21 H8 A2,2 0 0 1 6,19 V5 A2,2 0 0 1 8,3 Z"/>
+</vector>
diff --git a/app/src/main/res/drawable/ic_launcher_background.xml b/app/src/main/res/drawable/ic_launcher_background.xml
new file mode 100644
index 0000000..e26af1f
--- /dev/null
+++ b/app/src/main/res/drawable/ic_launcher_background.xml
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Dark CRT-terminal blue. Plain solid colour so the adaptive icon
+     reads cleanly under any launcher crop (circle, squircle, square). -->
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle">
+    <solid android:color="#0E1E28"/>
+</shape>
diff --git a/app/src/main/res/drawable/ic_launcher_foreground.xml b/app/src/main/res/drawable/ic_launcher_foreground.xml
new file mode 100644
index 0000000..e5b7400
--- /dev/null
+++ b/app/src/main/res/drawable/ic_launcher_foreground.xml
@@ -0,0 +1,52 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Foreground: a fresh take on wireless screen mirroring.
+       1. A small phone (source) and a larger phone (target display).
+       2. Cyan wireless arcs rising from the small phone toward the large
+          one - the wireless ADB link / casting direction.
+       3. A play triangle on the large screen - references scrcpy's
+          upstream identity ("playing what the device is showing").
+     Geometry mirrors the AI-generated reference 1:1. The arcs carry the
+     one accent colour; everything else is the light foreground tone.
+     For the Android 13+ themed (monochrome) icon the same drawable is
+     reused: the system tints by coverage, so the colours here are
+     irrelevant in that mode. Adaptive viewport is 108x108; all content
+     stays inside the inner safe zone. -->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+
+    <!-- Phone outlines (source 20x34, target 28x50), stroke only. -->
+    <path
+        android:strokeColor="#E8E8E8"
+        android:strokeWidth="3"
+        android:strokeLineJoin="round"
+        android:fillColor="#00000000"
+        android:pathData="M57,29 H75 A5,5 0 0 1 80,34 V74 A5,5 0 0 1 75,79 H57 A5,5 0 0 1 52,74 V34 A5,5 0 0 1 57,29 Z
+                          M30,47 H42 A4,4 0 0 1 46,51 V77 A4,4 0 0 1 42,81 H30 A4,4 0 0 1 26,77 V51 A4,4 0 0 1 30,47 Z"/>
+
+    <!-- Speaker slits and home indicators on both phones. -->
+    <path
+        android:strokeColor="#E8E8E8"
+        android:strokeWidth="2"
+        android:strokeLineCap="round"
+        android:fillColor="#00000000"
+        android:pathData="M62,35 H70 M61,74 H71 M32,52 H40 M32,76 H40"/>
+
+    <!-- Play triangle, filled, inside the large phone screen. -->
+    <path
+        android:fillColor="#E8E8E8"
+        android:pathData="M61,46 L61,62 L74,54 Z"/>
+
+    <!-- Wireless arcs: three concentric quarter-arcs centred at (40,48),
+         sweeping from north to east so they fan up-right from the small
+         phone toward the large one. -->
+    <path
+        android:strokeColor="#3FD0D6"
+        android:strokeWidth="2.5"
+        android:strokeLineCap="round"
+        android:fillColor="#00000000"
+        android:pathData="M40,43 A5,5 0 0 1 45,48 M40,39.5 A8.5,8.5 0 0 1 48.5,48 M40,36 A12,12 0 0 1 52,48"/>
+
+</vector>
diff --git a/app/src/main/res/drawable/ic_notification.xml b/app/src/main/res/drawable/ic_notification.xml
new file mode 100644
index 0000000..f592b9d
--- /dev/null
+++ b/app/src/main/res/drawable/ic_notification.xml
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Status-bar notification icon: white-on-transparent silhouette (the
+     launcher mipmap is the wrong shape and colour for a small icon). The
+     system tints it. Phone outline with a play triangle, matching the
+     app's visual identity. -->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24"
+    android:tint="#FFFFFF">
+    <path
+        android:strokeColor="#FFFFFF"
+        android:strokeWidth="1.8"
+        android:strokeLineJoin="round"
+        android:fillColor="#00000000"
+        android:pathData="M7,2 H17 A2,2 0 0 1 19,4 V20 A2,2 0 0 1 17,22 H7 A2,2 0 0 1 5,20 V4 A2,2 0 0 1 7,2 Z"/>
+    <path
+        android:fillColor="#FFFFFF"
+        android:pathData="M10,8 L10,16 L16,12 Z"/>
+</vector>
diff --git a/app/src/main/res/drawable/ic_settings.xml b/app/src/main/res/drawable/ic_settings.xml
new file mode 100644
index 0000000..696f6c2
--- /dev/null
+++ b/app/src/main/res/drawable/ic_settings.xml
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Gear glyph for the Settings action in the Main header. -->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24"
+    android:tint="@color/on_surface_muted">
+    <path
+        android:fillColor="#FFFFFF"
+        android:pathData="M19.14,12.94c0.04,-0.3 0.06,-0.61 0.06,-0.94c0,-0.32 -0.02,-0.64 -0.07,-0.94l2.03,-1.58c0.18,-0.14 0.23,-0.41 0.12,-0.61l-1.92,-3.32c-0.12,-0.22 -0.37,-0.29 -0.59,-0.22l-2.39,0.96c-0.5,-0.38 -1.03,-0.7 -1.62,-0.94l-0.36,-2.54c-0.04,-0.24 -0.24,-0.41 -0.48,-0.41h-3.84c-0.24,0 -0.43,0.17 -0.47,0.41l-0.36,2.54c-0.59,0.24 -1.13,0.57 -1.62,0.94l-2.39,-0.96c-0.22,-0.08 -0.47,0 -0.59,0.22L2.74,8.87C2.62,9.08 2.66,9.34 2.86,9.48l2.03,1.58C4.84,11.36 4.82,11.69 4.82,12s0.02,0.64 0.07,0.94l-2.03,1.58c-0.18,0.14 -0.23,0.41 -0.12,0.61l1.92,3.32c0.12,0.22 0.37,0.29 0.59,0.22l2.39,-0.96c0.5,0.38 1.03,0.7 1.62,0.94l0.36,2.54c0.05,0.24 0.24,0.41 0.48,0.41h3.84c0.24,0 0.44,-0.17 0.47,-0.41l0.36,-2.54c0.59,-0.24 1.13,-0.56 1.62,-0.94l2.39,0.96c0.22,0.08 0.47,0 0.59,-0.22l1.92,-3.32c0.12,-0.22 0.07,-0.47 -0.12,-0.61L19.14,12.94zM12,15.6c-1.98,0 -3.6,-1.62 -3.6,-3.6s1.62,-3.6 3.6,-3.6s3.6,1.62 3.6,3.6S13.98,15.6 12,15.6z"/>
+</vector>
diff --git a/app/src/main/res/layout/device_row.xml b/app/src/main/res/layout/device_row.xml
new file mode 100644
index 0000000..f06ab20
--- /dev/null
+++ b/app/src/main/res/layout/device_row.xml
@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Saved-device row: phone glyph + "host:port" label, with the platform
+     touch ripple. Bound by an ArrayAdapter via R.id.device_label. -->
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:orientation="horizontal"
+    android:gravity="center_vertical"
+    android:minHeight="56dp"
+    android:paddingHorizontal="@dimen/space_sm"
+    android:paddingVertical="@dimen/space_md"
+    android:background="?android:attr/selectableItemBackground">
+
+    <ImageView
+        android:layout_width="24dp"
+        android:layout_height="24dp"
+        android:src="@drawable/ic_device"
+        android:contentDescription="@null"/>
+
+    <TextView
+        android:id="@+id/device_label"
+        style="@style/DeviceLabel"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_weight="1"
+        android:layout_marginStart="@dimen/space_md"/>
+
+</LinearLayout>
diff --git a/app/src/main/res/layout/main.xml b/app/src/main/res/layout/main.xml
new file mode 100644
index 0000000..acd4a3c
--- /dev/null
+++ b/app/src/main/res/layout/main.xml
@@ -0,0 +1,181 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical"
+    android:padding="@dimen/space_lg">
+
+    <!-- Header: app glyph + name, Settings on the right. -->
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:orientation="horizontal"
+        android:gravity="center_vertical"
+        android:layout_marginBottom="@dimen/space_lg">
+
+        <ImageView
+            android:layout_width="40dp"
+            android:layout_height="40dp"
+            android:src="@drawable/ic_launcher_foreground"
+            android:scaleType="fitCenter"
+            android:contentDescription="@null"/>
+
+        <TextView
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_weight="1"
+            android:layout_marginStart="@dimen/space_sm"
+            android:text="@string/app_name"
+            android:textColor="@color/on_surface"
+            android:textSize="22sp"
+            android:textStyle="bold"/>
+
+        <ImageButton
+            android:id="@+id/settings"
+            android:layout_width="48dp"
+            android:layout_height="48dp"
+            android:src="@drawable/ic_settings"
+            android:scaleType="centerInside"
+            android:background="?android:attr/selectableItemBackgroundBorderless"
+            android:contentDescription="@string/settings"/>
+
+    </LinearLayout>
+
+    <!-- Pairing form. Fields are grouped and labelled by where their
+         value comes from on the target's Wireless debugging screen. -->
+    <LinearLayout
+        style="@style/Card"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content">
+
+        <TextView
+            style="@style/SectionHeader"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/pair_a_device"/>
+
+        <TextView
+            style="@style/Caption"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="@string/pair_help"/>
+
+        <TextView
+            style="@style/FieldLabel"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/label_host"/>
+
+        <EditText
+            android:id="@+id/host"
+            style="@style/Field"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:hint="@string/host_hint"
+            android:inputType="text"
+            android:autofillHints="postalAddress"/>
+
+        <TextView
+            style="@style/FieldLabel"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/label_pairing"/>
+
+        <TextView
+            style="@style/Caption"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="@string/sub_pairing"/>
+
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:orientation="horizontal"
+            android:layout_marginTop="@dimen/space_xs">
+
+            <EditText
+                android:id="@+id/pair_port"
+                style="@style/Field"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="1"
+                android:layout_marginEnd="@dimen/space_sm"
+                android:hint="@string/pair_port_hint"
+                android:inputType="number"
+                android:autofillHints="off"/>
+
+            <EditText
+                android:id="@+id/pair_code"
+                style="@style/Field"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="1"
+                android:hint="@string/pair_code_hint"
+                android:inputType="numberPassword"
+                android:maxLength="6"
+                android:autofillHints="off"/>
+
+        </LinearLayout>
+
+        <TextView
+            style="@style/FieldLabel"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/label_connect"/>
+
+        <TextView
+            style="@style/Caption"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="@string/sub_connect"/>
+
+        <EditText
+            android:id="@+id/connect_port"
+            style="@style/Field"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="@dimen/space_xs"
+            android:hint="@string/connect_port_hint"
+            android:inputType="number"
+            android:autofillHints="off"/>
+
+        <Button
+            android:id="@+id/pair"
+            style="@style/Button.Primary"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="@dimen/space_lg"
+            android:text="@string/pair_and_save"/>
+
+    </LinearLayout>
+
+    <TextView
+        style="@style/SectionHeader"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="@string/saved_devices"/>
+
+    <FrameLayout
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        android:layout_weight="1">
+
+        <ListView
+            android:id="@+id/devices"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:divider="@color/stroke"
+            android:dividerHeight="1dp"/>
+
+        <TextView
+            android:id="@+id/devices_empty"
+            style="@style/Note"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:gravity="center_horizontal"
+            android:paddingTop="@dimen/space_xl"
+            android:text="@string/no_devices_yet"/>
+
+    </FrameLayout>
+
+</LinearLayout>
diff --git a/app/src/main/res/layout/mirror.xml b/app/src/main/res/layout/mirror.xml
new file mode 100644
index 0000000..cf24e11
--- /dev/null
+++ b/app/src/main/res/layout/mirror.xml
@@ -0,0 +1,67 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Release Mirror layout: SurfaceView for the video pipeline plus a
+     floating top status pill with Record and a Reconnect button (visible
+     only when the session is in DISCONNECTED state). The debug layout
+     under src/debug/res/layout/mirror.xml shadows this with a TextureView
+     and extra stats overlay used by the e2e screen capture. -->
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="#000000">
+
+    <SurfaceView
+        android:id="@+id/surface"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:layout_gravity="center"/>
+
+    <LinearLayout
+        android:id="@+id/status_bar"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_gravity="top"
+        android:layout_margin="@dimen/space_sm"
+        android:orientation="horizontal"
+        android:gravity="center_vertical"
+        android:paddingHorizontal="@dimen/space_md"
+        android:paddingVertical="@dimen/space_sm"
+        android:background="@drawable/bg_status_pill">
+
+        <TextView
+            android:id="@+id/status_text"
+            android:layout_width="0dp"
+            android:layout_weight="1"
+            android:layout_height="wrap_content"
+            android:textColor="#ffffff"
+            android:textSize="14sp"
+            android:fontFamily="monospace"
+            android:singleLine="true"
+            android:ellipsize="end"
+            android:text="@string/connecting"/>
+
+        <Button
+            android:id="@+id/record"
+            style="@style/Button.Secondary"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginStart="@dimen/space_sm"
+            android:minHeight="0dp"
+            android:paddingHorizontal="@dimen/space_md"
+            android:paddingVertical="@dimen/space_xs"
+            android:text="@string/record"/>
+
+        <Button
+            android:id="@+id/reconnect"
+            style="@style/Button.Secondary"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginStart="@dimen/space_sm"
+            android:minHeight="0dp"
+            android:paddingHorizontal="@dimen/space_md"
+            android:paddingVertical="@dimen/space_xs"
+            android:text="@string/reconnect"
+            android:visibility="gone"/>
+
+    </LinearLayout>
+
+</FrameLayout>
diff --git a/app/src/main/res/layout/settings.xml b/app/src/main/res/layout/settings.xml
new file mode 100644
index 0000000..5d4e450
--- /dev/null
+++ b/app/src/main/res/layout/settings.xml
@@ -0,0 +1,294 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:orientation="vertical"
+        android:padding="@dimen/space_lg">
+
+        <TextView
+            style="@style/Note"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:paddingBottom="@dimen/space_lg"
+            android:text="@string/settings_apply_on_reconnect"/>
+
+        <LinearLayout
+            style="@style/Card"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content">
+
+            <TextView
+                style="@style/SectionHeader"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:text="@string/video_codec"/>
+
+            <RadioGroup
+                android:id="@+id/video_codec"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:orientation="vertical">
+
+                <RadioButton
+                    android:id="@+id/video_h264"
+                    style="@style/RadioOption"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="H.264 (default)"/>
+
+                <RadioButton
+                    android:id="@+id/video_h265"
+                    style="@style/RadioOption"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="H.265"/>
+
+                <RadioButton
+                    android:id="@+id/video_av1"
+                    style="@style/RadioOption"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="AV1 (requires target Android 14+)"/>
+
+            </RadioGroup>
+
+        </LinearLayout>
+
+        <LinearLayout
+            style="@style/Card"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content">
+
+            <TextView
+                style="@style/SectionHeader"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:text="@string/audio_codec"/>
+
+            <RadioGroup
+                android:id="@+id/audio_codec"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:orientation="vertical">
+
+                <RadioButton
+                    android:id="@+id/audio_raw"
+                    style="@style/RadioOption"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="Raw PCM (1.5 Mbps, default)"/>
+
+                <RadioButton
+                    android:id="@+id/audio_opus"
+                    style="@style/RadioOption"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="Opus (~128 kbps)"/>
+
+            </RadioGroup>
+
+        </LinearLayout>
+
+        <LinearLayout
+            style="@style/Card"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content">
+
+            <TextView
+                style="@style/SectionHeader"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:text="@string/max_size"/>
+
+            <RadioGroup
+                android:id="@+id/max_size"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:orientation="vertical">
+
+                <RadioButton
+                    android:id="@+id/max_size_0"
+                    style="@style/RadioOption"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="Original (default)"/>
+
+                <RadioButton
+                    android:id="@+id/max_size_480"
+                    style="@style/RadioOption"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="480"/>
+
+                <RadioButton
+                    android:id="@+id/max_size_720"
+                    style="@style/RadioOption"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="720"/>
+
+                <RadioButton
+                    android:id="@+id/max_size_1080"
+                    style="@style/RadioOption"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="1080"/>
+
+                <RadioButton
+                    android:id="@+id/max_size_1440"
+                    style="@style/RadioOption"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="1440"/>
+
+                <RadioButton
+                    android:id="@+id/max_size_2160"
+                    style="@style/RadioOption"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="2160"/>
+
+            </RadioGroup>
+
+        </LinearLayout>
+
+        <LinearLayout
+            style="@style/Card"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content">
+
+            <TextView
+                style="@style/SectionHeader"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:text="@string/video_bit_rate"/>
+
+            <RadioGroup
+                android:id="@+id/video_bit_rate"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:orientation="vertical">
+
+                <RadioButton
+                    android:id="@+id/bit_rate_1m"
+                    style="@style/RadioOption"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="1 Mbps"/>
+
+                <RadioButton
+                    android:id="@+id/bit_rate_2m"
+                    style="@style/RadioOption"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="2 Mbps"/>
+
+                <RadioButton
+                    android:id="@+id/bit_rate_4m"
+                    style="@style/RadioOption"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="4 Mbps"/>
+
+                <RadioButton
+                    android:id="@+id/bit_rate_8m"
+                    style="@style/RadioOption"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="8 Mbps (default)"/>
+
+                <RadioButton
+                    android:id="@+id/bit_rate_16m"
+                    style="@style/RadioOption"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="16 Mbps"/>
+
+            </RadioGroup>
+
+        </LinearLayout>
+
+        <LinearLayout
+            style="@style/Card"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content">
+
+            <TextView
+                style="@style/SectionHeader"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:text="@string/max_fps"/>
+
+            <RadioGroup
+                android:id="@+id/max_fps"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:orientation="vertical">
+
+                <RadioButton
+                    android:id="@+id/max_fps_0"
+                    style="@style/RadioOption"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="Unlimited (default)"/>
+
+                <RadioButton
+                    android:id="@+id/max_fps_30"
+                    style="@style/RadioOption"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="30"/>
+
+                <RadioButton
+                    android:id="@+id/max_fps_60"
+                    style="@style/RadioOption"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="60"/>
+
+                <RadioButton
+                    android:id="@+id/max_fps_90"
+                    style="@style/RadioOption"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="90"/>
+
+                <RadioButton
+                    android:id="@+id/max_fps_120"
+                    style="@style/RadioOption"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="120"/>
+
+            </RadioGroup>
+
+        </LinearLayout>
+
+        <LinearLayout
+            style="@style/Card"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginBottom="0dp">
+
+            <TextView
+                style="@style/SectionHeader"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:text="@string/display"/>
+
+            <CheckBox
+                android:id="@+id/show_status_bar"
+                style="@style/RadioOption"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:text="@string/show_status_bar"/>
+
+        </LinearLayout>
+
+    </LinearLayout>
+
+</ScrollView>
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
new file mode 100644
index 0000000..93542a7
--- /dev/null
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background"/>
+    <foreground android:drawable="@drawable/ic_launcher_foreground"/>
+    <monochrome android:drawable="@drawable/ic_launcher_foreground"/>
+</adaptive-icon>
diff --git a/app/src/main/res/values/colors.xml b/app/src/main/res/values/colors.xml
new file mode 100644
index 0000000..7e9fa9b
--- /dev/null
+++ b/app/src/main/res/values/colors.xml
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Dark palette built around the launcher icon's CRT-blue. The light
+     foreground (#E8E8E8) matches the icon; the cyan/teal accent tints
+     interactive controls. Hex values live here only; layouts reference
+     them by name. -->
+<resources>
+    <color name="bg">#0B1620</color>
+    <color name="surface">#14242E</color>
+    <color name="surface_alt">#0E1E28</color>
+    <color name="stroke">#283D49</color>
+    <color name="accent">#3FD0D6</color>
+    <color name="on_surface">#E8E8E8</color>
+    <color name="on_surface_muted">#8AA0AB</color>
+    <color name="on_accent">#04222B</color>
+    <color name="status_scrim">#B3000000</color>
+</resources>
diff --git a/app/src/main/res/values/dimens.xml b/app/src/main/res/values/dimens.xml
new file mode 100644
index 0000000..0ec4c88
--- /dev/null
+++ b/app/src/main/res/values/dimens.xml
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Single spacing scale and corner radii, referenced everywhere so the
+     layout rhythm stays consistent. -->
+<resources>
+    <dimen name="space_xs">4dp</dimen>
+    <dimen name="space_sm">8dp</dimen>
+    <dimen name="space_md">12dp</dimen>
+    <dimen name="space_lg">16dp</dimen>
+    <dimen name="space_xl">24dp</dimen>
+
+    <dimen name="card_radius">14dp</dimen>
+    <dimen name="field_radius">8dp</dimen>
+    <dimen name="button_radius">10dp</dimen>
+
+    <dimen name="card_padding">16dp</dimen>
+    <dimen name="touch_min">48dp</dimen>
+</resources>
diff --git a/app/src/main/res/values/ids.xml b/app/src/main/res/values/ids.xml
new file mode 100644
index 0000000..f551102
--- /dev/null
+++ b/app/src/main/res/values/ids.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- IDs referenced from Mirror.java that live only in the debug
+     layout (src/debug/res/layout/mirror.xml). Declaring them here
+     means R.id.* is stable across both build types; findViewById
+     returns null in release where the views are absent. -->
+<resources>
+    <item name="overlay_target" type="id"/>
+    <item name="overlay_stats"  type="id"/>
+    <item name="overlay_event"  type="id"/>
+</resources>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
new file mode 100644
index 0000000..a9a552c
--- /dev/null
+++ b/app/src/main/res/values/strings.xml
@@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_name">scrcpy</string>
+    <string name="host_hint">192.168.1.42</string>
+    <string name="pair_port_hint">37123</string>
+    <string name="pair_code_hint">6 digits</string>
+    <string name="connect_port_hint">41234</string>
+    <string name="pair_help">On the target: Settings &gt; Developer options &gt; Wireless debugging</string>
+    <string name="label_host">Host / IP address</string>
+    <string name="label_pairing">Pairing port and code</string>
+    <string name="sub_pairing">From the “Pair device with pairing code” dialog</string>
+    <string name="label_connect">Connection port</string>
+    <string name="sub_connect">Shown on the Wireless debugging screen</string>
+    <string name="pair_and_save">Pair and save</string>
+    <string name="pair_a_device">Pair a device</string>
+    <string name="saved_devices">Saved devices</string>
+    <string name="notif_session_active">Mirroring active</string>
+    <string name="settings">Settings</string>
+    <string name="video_codec">Video codec</string>
+    <string name="audio_codec">Audio codec</string>
+    <string name="forget_device">Forget device?</string>
+    <string name="max_size">Max size (long edge, px)</string>
+    <string name="video_bit_rate">Video bit rate</string>
+    <string name="max_fps">Max fps</string>
+    <string name="reconnect">Reconnect</string>
+    <string name="connecting">connecting…</string>
+    <string name="disconnected">disconnected</string>
+    <string name="record">Record</string>
+    <string name="record_on">Stop recording</string>
+    <string name="hint_long_press_back">Long-press Back to send it to the target device.</string>
+    <string name="pairing">Pairing…</string>
+    <string name="settings_apply_on_reconnect">Changes apply on the next connection.</string>
+    <string name="display">Display</string>
+    <string name="show_status_bar">Show status bar (IP, resolution, Record) while mirroring</string>
+    <string name="no_devices_yet">No devices paired yet - fill the fields above and tap Pair.</string>
+</resources>
diff --git a/app/src/main/res/values/styles.xml b/app/src/main/res/values/styles.xml
new file mode 100644
index 0000000..d0b07ac
--- /dev/null
+++ b/app/src/main/res/values/styles.xml
@@ -0,0 +1,73 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Reusable widget styles. Applied per-widget via style="@style/..." so
+     behaviour stays explicit and visible at the call site. -->
+<resources>
+    <style name="Card">
+        <item name="android:orientation">vertical</item>
+        <item name="android:background">@drawable/bg_card</item>
+        <item name="android:padding">@dimen/card_padding</item>
+        <item name="android:layout_marginBottom">@dimen/space_lg</item>
+    </style>
+
+    <style name="SectionHeader">
+        <item name="android:textColor">@color/on_surface</item>
+        <item name="android:textStyle">bold</item>
+        <item name="android:textSize">16sp</item>
+        <item name="android:paddingBottom">@dimen/space_sm</item>
+    </style>
+
+    <style name="Field" parent="@android:style/Widget.Material.EditText">
+        <item name="android:background">@drawable/bg_field</item>
+        <item name="android:textColor">@color/on_surface</item>
+        <item name="android:textColorHint">@color/on_surface_muted</item>
+        <item name="android:paddingHorizontal">@dimen/space_md</item>
+        <item name="android:paddingVertical">@dimen/space_md</item>
+        <item name="android:minHeight">@dimen/touch_min</item>
+    </style>
+
+    <style name="Button.Primary" parent="@android:style/Widget.Material.Button">
+        <item name="android:background">@drawable/btn_primary</item>
+        <item name="android:textColor">@color/on_accent</item>
+        <item name="android:textStyle">bold</item>
+        <item name="android:textAllCaps">false</item>
+        <item name="android:minHeight">@dimen/touch_min</item>
+    </style>
+
+    <style name="Button.Secondary" parent="@android:style/Widget.Material.Button">
+        <item name="android:background">@drawable/btn_secondary</item>
+        <item name="android:textColor">@color/accent</item>
+        <item name="android:textAllCaps">false</item>
+        <item name="android:minWidth">0dp</item>
+    </style>
+
+    <style name="RadioOption">
+        <item name="android:textColor">@color/on_surface</item>
+        <item name="android:textSize">15sp</item>
+        <item name="android:paddingTop">@dimen/space_sm</item>
+        <item name="android:paddingBottom">@dimen/space_sm</item>
+        <item name="android:minHeight">44dp</item>
+    </style>
+
+    <style name="Note">
+        <item name="android:textStyle">italic</item>
+        <item name="android:textColor">@color/on_surface_muted</item>
+    </style>
+
+    <style name="FieldLabel">
+        <item name="android:textColor">@color/on_surface</item>
+        <item name="android:textSize">13sp</item>
+        <item name="android:textStyle">bold</item>
+        <item name="android:paddingTop">@dimen/space_md</item>
+    </style>
+
+    <style name="Caption">
+        <item name="android:textColor">@color/on_surface_muted</item>
+        <item name="android:textSize">12sp</item>
+    </style>
+
+    <style name="DeviceLabel">
+        <item name="android:textColor">@color/on_surface</item>
+        <item name="android:textSize">16sp</item>
+        <item name="android:fontFamily">monospace</item>
+    </style>
+</resources>
diff --git a/app/src/main/res/values/themes.xml b/app/src/main/res/values/themes.xml
new file mode 100644
index 0000000..3d702c6
--- /dev/null
+++ b/app/src/main/res/values/themes.xml
@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Custom theme on the platform's built-in Material theme (ships with
+     Android, not a dependency). Setting the colour attributes makes the
+     framework auto-tint EditText focus, radio buttons, checkboxes, the
+     action bar, and the cursor. NoActionBar / Fullscreen inherit the
+     same colours via dotted-name inheritance. -->
+<resources>
+    <style name="Theme.Scrcpy" parent="@android:style/Theme.Material">
+        <item name="android:colorBackground">@color/bg</item>
+        <item name="android:windowBackground">@color/bg</item>
+        <item name="android:colorPrimary">@color/surface</item>
+        <item name="android:colorPrimaryDark">@color/bg</item>
+        <item name="android:colorAccent">@color/accent</item>
+        <item name="android:textColorPrimary">@color/on_surface</item>
+        <item name="android:textColorSecondary">@color/on_surface_muted</item>
+        <item name="android:textColorHint">@color/on_surface_muted</item>
+        <item name="android:statusBarColor">@color/bg</item>
+        <item name="android:navigationBarColor">@color/bg</item>
+    </style>
+
+    <style name="Theme.Scrcpy.NoActionBar">
+        <item name="android:windowActionBar">false</item>
+        <item name="android:windowNoTitle">true</item>
+    </style>
+
+    <style name="Theme.Scrcpy.Fullscreen">
+        <item name="android:windowActionBar">false</item>
+        <item name="android:windowNoTitle">true</item>
+        <item name="android:windowFullscreen">true</item>
+        <item name="android:windowBackground">@android:color/black</item>
+    </style>
+</resources>
diff --git a/app/src/test/java/invalid/lena/scrcpy/AtomicFilesTest.java b/app/src/test/java/invalid/lena/scrcpy/AtomicFilesTest.java
new file mode 100644
index 0000000..7124fd2
--- /dev/null
+++ b/app/src/test/java/invalid/lena/scrcpy/AtomicFilesTest.java
@@ -0,0 +1,54 @@
+package invalid.lena.scrcpy;
+
+import static org.junit.Assert.assertArrayEquals;
+import static org.junit.Assert.assertFalse;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.TemporaryFolder;
+
+import java.io.File;
+import java.nio.file.Files;
+
+public class AtomicFilesTest {
+
+    @Rule
+    public TemporaryFolder dir = new TemporaryFolder();
+
+    @Test
+    public void writeCreatesFile() throws Exception {
+        File f = new File(dir.getRoot(), "x");
+        AtomicFiles.write(f, "hello".getBytes());
+        assertArrayEquals("hello".getBytes(), Files.readAllBytes(f.toPath()));
+    }
+
+    @Test
+    public void writeReplacesExistingWhole() throws Exception {
+        File f = new File(dir.getRoot(), "x");
+        AtomicFiles.write(f, "old".getBytes());
+        AtomicFiles.write(f, "new-and-longer".getBytes());
+        assertArrayEquals("new-and-longer".getBytes(), Files.readAllBytes(f.toPath()));
+    }
+
+    @Test
+    public void writeLeavesNoTempBehind() throws Exception {
+        File f = new File(dir.getRoot(), "x");
+        AtomicFiles.write(f, "data".getBytes());
+        assertFalse(new File(dir.getRoot(), "x.tmp").exists());
+    }
+
+    @Test
+    public void staleTempDoesNotCorruptDestination() throws Exception {
+        // A crash after staging but before the rename leaves a partial ".tmp".
+        // The destination must still hold the previous good content, and the
+        // next successful write must overwrite the stale temp cleanly.
+        File f = new File(dir.getRoot(), "x");
+        AtomicFiles.write(f, "good".getBytes());
+        Files.write(new File(dir.getRoot(), "x.tmp").toPath(), "partial".getBytes());
+        assertArrayEquals("good".getBytes(), Files.readAllBytes(f.toPath()));
+
+        AtomicFiles.write(f, "good2".getBytes());
+        assertArrayEquals("good2".getBytes(), Files.readAllBytes(f.toPath()));
+        assertFalse(new File(dir.getRoot(), "x.tmp").exists());
+    }
+}
diff --git a/app/src/test/java/invalid/lena/scrcpy/AudioStreamTest.java b/app/src/test/java/invalid/lena/scrcpy/AudioStreamTest.java
new file mode 100644
index 0000000..076d27c
--- /dev/null
+++ b/app/src/test/java/invalid/lena/scrcpy/AudioStreamTest.java
@@ -0,0 +1,123 @@
+package invalid.lena.scrcpy;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Test;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.DataOutputStream;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+public class AudioStreamTest {
+
+    private static final long FLAG_CONFIG = 1L << 62;
+
+    private static final class RecordingFrames implements AudioFrames {
+        int starts = 0, releases = 0, startFourcc = 0;
+        final List<byte[]>  feeds = new ArrayList<>();
+        final List<Boolean> cfgs  = new ArrayList<>();
+        @Override public void start(int fourcc) { starts++; startFourcc = fourcc; }
+        @Override public void feed(byte[] data, int off, int len, boolean isConfig) {
+            byte[] cp = new byte[len];
+            System.arraycopy(data, off, cp, 0, len);
+            feeds.add(cp);
+            cfgs.add(isConfig);
+        }
+        @Override public void release() { releases++; }
+    }
+
+    private static byte[] fourcc(int v) throws IOException {
+        ByteArrayOutputStream bos = new ByteArrayOutputStream();
+        new DataOutputStream(bos).writeInt(v);
+        return bos.toByteArray();
+    }
+
+    private static byte[] frame(long ptsAndFlags, byte[] payload) throws IOException {
+        ByteArrayOutputStream bos = new ByteArrayOutputStream();
+        DataOutputStream out = new DataOutputStream(bos);
+        out.writeLong(ptsAndFlags);
+        out.writeInt(payload.length);
+        out.write(payload);
+        return bos.toByteArray();
+    }
+
+    private static byte[] cat(byte[]... parts) throws IOException {
+        ByteArrayOutputStream bos = new ByteArrayOutputStream();
+        for (byte[] p : parts) bos.write(p);
+        return bos.toByteArray();
+    }
+
+    @Test
+    public void rawCodecFeedsFrames() throws Exception {
+        byte[] pcm1 = new byte[]{1, 2, 3, 4};
+        byte[] pcm2 = new byte[]{5, 6, 7, 8, 9, 10};
+        byte[] bytes = cat(
+                fourcc(Wire.CODEC_RAW),
+                frame(1_000_000L, pcm1),
+                frame(2_000_000L, pcm2));
+
+        RecordingFrames sink = new RecordingFrames();
+        new AudioStream(new ByteArrayInputStream(bytes), sink).run();
+
+        assertEquals(1, sink.starts);
+        assertEquals(Wire.CODEC_RAW, sink.startFourcc);
+        assertEquals(2, sink.feeds.size());
+        assertEquals(pcm1.length, sink.feeds.get(0).length);
+        assertEquals(pcm2.length, sink.feeds.get(1).length);
+        for (int i = 0; i < pcm1.length; i++) assertEquals(pcm1[i], sink.feeds.get(0)[i]);
+        for (int i = 0; i < pcm2.length; i++) assertEquals(pcm2[i], sink.feeds.get(1)[i]);
+        assertEquals(false, sink.cfgs.get(0));
+        assertEquals(false, sink.cfgs.get(1));
+    }
+
+    @Test
+    public void opusConfigFlagIsExposed() throws Exception {
+        byte[] head = new byte[]{
+                'O','p','u','s','H','e','a','d', // magic
+                1,                                // version
+                2,                                // channel count
+                (byte)0x38, 0x01,                 // pre-skip = 312 LE
+                (byte)0x80, (byte)0xBB, 0, 0,     // sample rate 48000 LE
+                0, 0,                             // output gain
+                0                                 // channel mapping family
+        };
+        byte[] pkt = new byte[]{0x10, 0x20, 0x30};
+        byte[] bytes = cat(
+                fourcc(Wire.CODEC_OPUS),
+                frame(FLAG_CONFIG, head),
+                frame(0L, pkt));
+
+        RecordingFrames sink = new RecordingFrames();
+        new AudioStream(new ByteArrayInputStream(bytes), sink).run();
+
+        assertEquals(1, sink.starts);
+        assertEquals(Wire.CODEC_OPUS, sink.startFourcc);
+        assertEquals(2, sink.feeds.size());
+        assertTrue("first frame must carry FLAG_CONFIG", sink.cfgs.get(0));
+        assertTrue("second frame must not carry FLAG_CONFIG", !sink.cfgs.get(1));
+        assertEquals(head.length, sink.feeds.get(0).length);
+        assertEquals(pkt.length, sink.feeds.get(1).length);
+    }
+
+    @Test
+    public void disabledCodecDoesNotStart() throws Exception {
+        byte[] bytes = fourcc(0);
+        RecordingFrames sink = new RecordingFrames();
+        new AudioStream(new ByteArrayInputStream(bytes), sink).run();
+        assertEquals(0, sink.starts);
+        assertEquals(0, sink.feeds.size());
+    }
+
+    @Test
+    public void errorCodecDoesNotStart() throws Exception {
+        byte[] bytes = fourcc(1);
+        RecordingFrames sink = new RecordingFrames();
+        new AudioStream(new ByteArrayInputStream(bytes), sink).run();
+        assertEquals(0, sink.starts);
+        assertEquals(0, sink.feeds.size());
+    }
+}
diff --git a/app/src/test/java/invalid/lena/scrcpy/ControlMessagesTest.java b/app/src/test/java/invalid/lena/scrcpy/ControlMessagesTest.java
new file mode 100644
index 0000000..a84e18e
--- /dev/null
+++ b/app/src/test/java/invalid/lena/scrcpy/ControlMessagesTest.java
@@ -0,0 +1,65 @@
+package invalid.lena.scrcpy;
+
+import static org.junit.Assert.assertArrayEquals;
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+
+import java.nio.charset.StandardCharsets;
+
+public class ControlMessagesTest {
+
+    @Test
+    public void touchByteLayout() {
+        // ACTION_DOWN=0, single finger, target 1080x2400, x=100, y=200, full pressure
+        byte[] m = ControlMessages.touch(/* action */ 0, /* pointerId */ 0L,
+                /* x */ 100, /* y */ 200, /* tw */ 1080, /* th */ 2400,
+                /* pressure */ 0xffff, /* actionButton */ 0, /* buttons */ 0);
+        assertEquals(ControlMessages.TOUCH_MSG_LEN, m.length);
+        assertEquals(ControlMessages.TYPE_INJECT_TOUCH_EVENT, m[0]);
+        assertEquals(0, m[1]);                              // action
+        assertEquals(0L, Wire.readBe64(m, 2));              // pointer id
+        assertEquals(100, Wire.readBe32(m, 10));            // x
+        assertEquals(200, Wire.readBe32(m, 14));            // y
+        assertEquals(1080, ((m[18] & 0xff) << 8) | (m[19] & 0xff));  // tw
+        assertEquals(2400, ((m[20] & 0xff) << 8) | (m[21] & 0xff));  // th
+        assertEquals(0xffff, ((m[22] & 0xff) << 8) | (m[23] & 0xff)); // pressure
+        assertEquals(0, Wire.readBe32(m, 24));              // actionButton
+        assertEquals(0, Wire.readBe32(m, 28));              // buttons
+    }
+
+    @Test
+    public void keycodeByteLayout() {
+        // ACTION_DOWN=0, KEYCODE_A=29, repeat=0, metaState=0
+        byte[] m = ControlMessages.keycode(0, 29, 0, 0);
+        assertEquals(ControlMessages.KEY_MSG_LEN, m.length);
+        assertEquals(ControlMessages.TYPE_INJECT_KEYCODE, m[0]);
+        assertEquals(0, m[1]);
+        assertEquals(29, Wire.readBe32(m, 2));
+        assertEquals(0,  Wire.readBe32(m, 6));
+        assertEquals(0,  Wire.readBe32(m, 10));
+    }
+
+    @Test
+    public void setClipboardWithUtf8Payload() {
+        String text = "héllo 🎉";   // includes a 4-byte surrogate pair
+        byte[] expected = text.getBytes(StandardCharsets.UTF_8);
+        byte[] m = ControlMessages.setClipboard(0xdeadbeefcafeL, /* paste */ true, text);
+        assertEquals(1 + 8 + 1 + 4 + expected.length, m.length);
+        assertEquals(ControlMessages.TYPE_SET_CLIPBOARD, m[0]);
+        assertEquals(0xdeadbeefcafeL, Wire.readBe64(m, 1));
+        assertEquals(1, m[9]);                              // paste
+        assertEquals(expected.length, Wire.readBe32(m, 10));
+        byte[] tail = new byte[expected.length];
+        System.arraycopy(m, 14, tail, 0, expected.length);
+        assertArrayEquals(expected, tail);
+    }
+
+    @Test
+    public void setClipboardNoPaste() {
+        byte[] m = ControlMessages.setClipboard(0L, false, "");
+        assertEquals(0, m[9]);
+        assertEquals(0, Wire.readBe32(m, 10));
+        assertEquals(14, m.length);
+    }
+}
diff --git a/app/src/test/java/invalid/lena/scrcpy/ControlStreamTest.java b/app/src/test/java/invalid/lena/scrcpy/ControlStreamTest.java
new file mode 100644
index 0000000..cafff81
--- /dev/null
+++ b/app/src/test/java/invalid/lena/scrcpy/ControlStreamTest.java
@@ -0,0 +1,152 @@
+package invalid.lena.scrcpy;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotEquals;
+
+import org.junit.Test;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.DataOutputStream;
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.List;
+
+public class ControlStreamTest {
+
+    private static final class RecordingSink implements ControlStream.InboundSink {
+        final List<String> clipboards = new ArrayList<>();
+        @Override public void onRemoteClipboard(String text) { clipboards.add(text); }
+    }
+
+    // ---- inbound (DeviceMessage) parsing ----
+
+    @Test
+    public void clipboardMessageDispatched() throws Exception {
+        String text = "héllo world";
+        byte[] payload = text.getBytes(StandardCharsets.UTF_8);
+        ByteArrayOutputStream bos = new ByteArrayOutputStream();
+        DataOutputStream out = new DataOutputStream(bos);
+        out.writeByte(0);                  // TYPE_CLIPBOARD
+        out.writeInt(payload.length);
+        out.write(payload);
+
+        RecordingSink sink = new RecordingSink();
+        ControlStream cs = new ControlStream(
+                new ByteArrayInputStream(bos.toByteArray()),
+                new ByteArrayOutputStream());
+        cs.setInboundSink(sink);
+        cs.runReader();   // synchronous; returns on EOF
+
+        assertEquals(1, sink.clipboards.size());
+        assertEquals(text, sink.clipboards.get(0));
+    }
+
+    @Test
+    public void ackClipboardConsumedSilently() throws Exception {
+        // type=1, then a long sequence number. No dispatch should occur.
+        ByteArrayOutputStream bos = new ByteArrayOutputStream();
+        DataOutputStream out = new DataOutputStream(bos);
+        out.writeByte(1);
+        out.writeLong(0x1234567890abcdefL);
+
+        RecordingSink sink = new RecordingSink();
+        ControlStream cs = new ControlStream(
+                new ByteArrayInputStream(bos.toByteArray()),
+                new ByteArrayOutputStream());
+        cs.setInboundSink(sink);
+        cs.runReader();
+
+        assertEquals(0, sink.clipboards.size());
+    }
+
+    @Test
+    public void unknownTypeAborts() throws Exception {
+        // type=42 - runReader should log and return.
+        ByteArrayOutputStream bos = new ByteArrayOutputStream();
+        bos.write(42);
+        // a few trailing bytes so the reader doesn't EOF before processing
+        bos.write(new byte[]{0, 0, 0, 0});
+
+        RecordingSink sink = new RecordingSink();
+        ControlStream cs = new ControlStream(
+                new ByteArrayInputStream(bos.toByteArray()),
+                new ByteArrayOutputStream());
+        cs.setInboundSink(sink);
+        cs.runReader();
+        assertEquals(0, sink.clipboards.size());
+    }
+
+    // ---- outbound (send + writer) ----
+
+    @Test
+    public void writerDrainsInOrder() throws Exception {
+        // We submit three messages, then run the writer until the
+        // outbox is empty AND we've signalled stop.
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+        ControlStream cs = new ControlStream(
+                new ByteArrayInputStream(new byte[0]), out);
+
+        byte[] a = new byte[]{1, 2, 3};
+        byte[] b = new byte[]{4, 5};
+        byte[] c = new byte[]{6};
+        cs.send(a);
+        cs.send(b);
+        cs.send(c);
+
+        Thread writer = new Thread(cs::runWriter, "writer-under-test");
+        writer.start();
+
+        // give the writer a moment to drain
+        for (int i = 0; i < 50 && out.size() < 6; i++) Thread.sleep(10);
+        cs.stop();
+        writer.join(1_000);
+
+        byte[] got = out.toByteArray();
+        assertEquals(6, got.length);
+        assertEquals(1, got[0]); assertEquals(2, got[1]); assertEquals(3, got[2]);
+        assertEquals(4, got[3]); assertEquals(5, got[4]);
+        assertEquals(6, got[5]);
+    }
+
+    @Test
+    public void keyEventLandsAfterOutboxOverflow() throws Exception {
+        // Fill the bounded outbox with touch-MOVE messages, then enqueue
+        // one key event. The MOVE must be evicted to make room; the key
+        // event must be preserved and end up last in the drain.
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+        ControlStream cs = new ControlStream(
+                new ByteArrayInputStream(new byte[0]), out);
+
+        for (int i = 0; i < 256; i++) {
+            cs.send(ControlMessages.touch(/* MOVE */ 2, 0L, i, i, 1080, 2400, 0xffff, 0, 0));
+        }
+        byte[] key = ControlMessages.keycode(0, 29, 0, 0);
+        cs.send(key);
+
+        Thread w = new Thread(cs::runWriter, "drain");
+        w.start();
+
+        // Drain to quiescence (size stable for 100ms).
+        long deadline = System.currentTimeMillis() + 2_000;
+        int last = -1, stable = 0;
+        while (System.currentTimeMillis() < deadline) {
+            int now = out.size();
+            if (now == last) { stable++; if (stable > 5) break; }
+            else { stable = 0; last = now; }
+            Thread.sleep(20);
+        }
+        cs.stop();
+        w.join(1_000);
+
+        byte[] bytes = out.toByteArray();
+        assertNotEquals(0, bytes.length);
+
+        // The key event should be the final 14 bytes of the drained stream
+        // (queued last, FIFO order, only touch-MOVEs evicted on overflow).
+        byte[] tail = new byte[14];
+        System.arraycopy(bytes, bytes.length - 14, tail, 0, 14);
+        for (int i = 0; i < 14; i++) assertEquals(key[i], tail[i]);
+    }
+}
diff --git a/app/src/test/java/invalid/lena/scrcpy/DevicesTest.java b/app/src/test/java/invalid/lena/scrcpy/DevicesTest.java
new file mode 100644
index 0000000..d1e4f02
--- /dev/null
+++ b/app/src/test/java/invalid/lena/scrcpy/DevicesTest.java
@@ -0,0 +1,64 @@
+package invalid.lena.scrcpy;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+public class DevicesTest {
+
+    @Test
+    public void parseEmptyOrNull() {
+        assertTrue(Devices.parse(null).isEmpty());
+        assertTrue(Devices.parse("").isEmpty());
+        assertTrue(Devices.parse("   ").isEmpty());
+    }
+
+    @Test
+    public void parseNonArrayReturnsEmpty() {
+        assertTrue(Devices.parse("{not json").isEmpty());
+        assertTrue(Devices.parse("{\"host\":\"x\"}").isEmpty());
+    }
+
+    @Test
+    public void parseSkipsMalformedRowsKeepsValid() {
+        // Middle row missing 'port' - must NOT nuke the other two.
+        String json = "["
+                + "{\"host\":\"a\",\"port\":1},"
+                + "{\"host\":\"bad\"},"
+                + "{\"host\":\"c\",\"port\":3}"
+                + "]";
+        List<Devices.Device> got = Devices.parse(json);
+        assertEquals(2, got.size());
+        assertEquals("a", got.get(0).host);
+        assertEquals("c", got.get(1).host);
+    }
+
+    @Test
+    public void roundTrip() {
+        List<Devices.Device> in = new ArrayList<>(Arrays.asList(
+                new Devices.Device("192.168.1.10", 5555),
+                new Devices.Device("10.0.0.2",     43210)));
+        String json = Devices.serialize(in);
+        List<Devices.Device> out = Devices.parse(json);
+        assertEquals(2, out.size());
+        assertEquals("192.168.1.10", out.get(0).host);
+        assertEquals(5555,           out.get(0).port);
+        assertEquals("10.0.0.2",     out.get(1).host);
+        assertEquals(43210,          out.get(1).port);
+    }
+
+    @Test
+    public void deviceEqualsByHostAndPort() {
+        Devices.Device a = new Devices.Device("1.1.1.1", 5555);
+        Devices.Device b = new Devices.Device("1.1.1.1", 5555);
+        Devices.Device c = new Devices.Device("1.1.1.1", 5556);
+        assertEquals(a, b);
+        assertEquals(a.hashCode(), b.hashCode());
+        assertEquals(false, a.equals(c));
+    }
+}
diff --git a/app/src/test/java/invalid/lena/scrcpy/SyncTest.java b/app/src/test/java/invalid/lena/scrcpy/SyncTest.java
new file mode 100644
index 0000000..57493ec
--- /dev/null
+++ b/app/src/test/java/invalid/lena/scrcpy/SyncTest.java
@@ -0,0 +1,137 @@
+package invalid.lena.scrcpy;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
+
+import org.junit.Test;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+
+public class SyncTest {
+
+    private static final String PATH = "/data/local/tmp/scrcpy-server.jar";
+    private static final int    MODE = 0100644;
+    private static final int    MTIME = 0x12345678;
+
+    @Test
+    public void emptyPayloadFraming() throws Exception {
+        byte[] payload = new byte[0];
+        ByteArrayOutputStream framed = new ByteArrayOutputStream();
+        ByteArrayInputStream resp    = okayResponse();
+
+        long total = Sync.push(new ByteArrayInputStream(payload), framed, resp, PATH, MODE, MTIME);
+        assertEquals(0L, total);
+
+        byte[] bytes = framed.toByteArray();
+        int pos = 0;
+
+        // SEND + le32(headerLen) + header
+        String header = PATH + "," + MODE;
+        byte[] hb = header.getBytes(StandardCharsets.UTF_8);
+        pos = assertTag(bytes, pos, "SEND");
+        assertEquals(hb.length, Wire.readLe32(bytes, pos)); pos += 4;
+        for (int i = 0; i < hb.length; i++, pos++) assertEquals(hb[i], bytes[pos]);
+
+        // No DATA chunks for empty payload.
+        // DONE + le32(mtime)
+        pos = assertTag(bytes, pos, "DONE");
+        assertEquals(MTIME, Wire.readLe32(bytes, pos)); pos += 4;
+
+        assertEquals(bytes.length, pos);
+    }
+
+    @Test
+    public void singleByteIsOneDataChunk() throws Exception {
+        ByteArrayOutputStream framed = new ByteArrayOutputStream();
+        long total = Sync.push(new ByteArrayInputStream(new byte[]{0x42}),
+                framed, okayResponse(), PATH, MODE, MTIME);
+        assertEquals(1L, total);
+
+        byte[] bytes = framed.toByteArray();
+        int pos = skipSendHeader(bytes);
+        pos = assertTag(bytes, pos, "DATA");
+        assertEquals(1, Wire.readLe32(bytes, pos)); pos += 4;
+        assertEquals(0x42, bytes[pos]); pos += 1;
+        pos = assertTag(bytes, pos, "DONE");
+        assertEquals(MTIME, Wire.readLe32(bytes, pos)); pos += 4;
+        assertEquals(bytes.length, pos);
+    }
+
+    @Test
+    public void payloadLargerThanChunkSplits() throws Exception {
+        int n = Sync.CHUNK + 1;
+        byte[] payload = new byte[n];
+        for (int i = 0; i < n; i++) payload[i] = (byte) i;
+
+        ByteArrayOutputStream framed = new ByteArrayOutputStream();
+        long total = Sync.push(new ByteArrayInputStream(payload),
+                framed, okayResponse(), PATH, MODE, MTIME);
+        assertEquals(n, total);
+
+        byte[] bytes = framed.toByteArray();
+        int pos = skipSendHeader(bytes);
+
+        // First DATA = full chunk
+        pos = assertTag(bytes, pos, "DATA");
+        assertEquals(Sync.CHUNK, Wire.readLe32(bytes, pos)); pos += 4;
+        pos += Sync.CHUNK;
+
+        // Second DATA = the remaining one byte
+        pos = assertTag(bytes, pos, "DATA");
+        assertEquals(1, Wire.readLe32(bytes, pos)); pos += 4;
+        pos += 1;
+
+        pos = assertTag(bytes, pos, "DONE");
+        assertEquals(MTIME, Wire.readLe32(bytes, pos)); pos += 4;
+        assertEquals(bytes.length, pos);
+    }
+
+    @Test
+    public void failResponseRaises() {
+        ByteArrayOutputStream framed = new ByteArrayOutputStream();
+        ByteArrayInputStream resp = failResponse("disk full");
+        try {
+            Sync.push(new ByteArrayInputStream(new byte[]{1, 2, 3}), framed, resp,
+                    PATH, MODE, MTIME);
+            fail("expected IOException");
+        } catch (IOException e) {
+            assertTrue(e.getMessage(), e.getMessage().contains("disk full"));
+            assertTrue(e.getMessage(), e.getMessage().startsWith("sync FAIL"));
+        }
+    }
+
+    private static ByteArrayInputStream okayResponse() {
+        byte[] r = new byte[8];
+        r[0] = 'O'; r[1] = 'K'; r[2] = 'A'; r[3] = 'Y';
+        // length 0
+        return new ByteArrayInputStream(r);
+    }
+
+    private static ByteArrayInputStream failResponse(String msg) {
+        byte[] mb = msg.getBytes(StandardCharsets.UTF_8);
+        byte[] r = new byte[8 + mb.length];
+        r[0] = 'F'; r[1] = 'A'; r[2] = 'I'; r[3] = 'L';
+        Wire.writeLe32(r, 4, mb.length);
+        System.arraycopy(mb, 0, r, 8, mb.length);
+        return new ByteArrayInputStream(r);
+    }
+
+    private static int assertTag(byte[] bytes, int pos, String tag) {
+        for (int i = 0; i < 4; i++) {
+            assertEquals("tag pos=" + pos + " idx=" + i,
+                    (byte) tag.charAt(i), bytes[pos + i]);
+        }
+        return pos + 4;
+    }
+
+    private static int skipSendHeader(byte[] bytes) {
+        // SEND + le32(len) + header
+        int pos = 4;
+        int len = Wire.readLe32(bytes, pos);
+        return pos + 4 + len;
+    }
+}
diff --git a/app/src/test/java/invalid/lena/scrcpy/VideoStreamTest.java b/app/src/test/java/invalid/lena/scrcpy/VideoStreamTest.java
new file mode 100644
index 0000000..9d132f6
--- /dev/null
+++ b/app/src/test/java/invalid/lena/scrcpy/VideoStreamTest.java
@@ -0,0 +1,245 @@
+package invalid.lena.scrcpy;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Test;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.DataOutputStream;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+public class VideoStreamTest {
+
+    // ---- recording sink ----
+
+    private static final class RecordingFrames implements VideoFrames {
+        static final class Cfg  { final int fourcc, w, h; Cfg(int f,int w,int h){this.fourcc=f;this.w=w;this.h=h;} }
+        static final class Feed { final byte[] data; final long ptsUs; final boolean isCfg;
+                                  Feed(byte[] d,long p,boolean c){data=d;ptsUs=p;isCfg=c;} }
+
+        final List<Cfg>  configs    = new ArrayList<>();
+        final List<Cfg>  reconfigs  = new ArrayList<>();
+        final List<Feed> feeds      = new ArrayList<>();
+        int releases = 0;
+
+        @Override public void configure(int f, int w, int h)    { configs.add(new Cfg(f, w, h)); }
+        @Override public void reconfigure(int f, int w, int h)  { reconfigs.add(new Cfg(f, w, h)); }
+        @Override public void feed(byte[] d, long pts, boolean c){ feeds.add(new Feed(d, pts, c)); }
+        @Override public void release() { releases++; }
+    }
+
+    // ---- byte builders ----
+
+    private static byte[] fourcc(int v) throws IOException {
+        ByteArrayOutputStream bos = new ByteArrayOutputStream();
+        new DataOutputStream(bos).writeInt(v);
+        return bos.toByteArray();
+    }
+
+    private static byte[] sessionMeta(int w, int h, boolean clientResize) throws IOException {
+        ByteArrayOutputStream bos = new ByteArrayOutputStream();
+        DataOutputStream out = new DataOutputStream(bos);
+        out.writeInt(0x80000000 | (clientResize ? 1 : 0));
+        out.writeInt(w);
+        out.writeInt(h);
+        return bos.toByteArray();
+    }
+
+    private static byte[] frame(long ptsAndFlags, byte[] payload) throws IOException {
+        ByteArrayOutputStream bos = new ByteArrayOutputStream();
+        DataOutputStream out = new DataOutputStream(bos);
+        out.writeLong(ptsAndFlags);
+        out.writeInt(payload.length);
+        out.write(payload);
+        return bos.toByteArray();
+    }
+
+    private static byte[] cat(byte[]... parts) throws IOException {
+        ByteArrayOutputStream bos = new ByteArrayOutputStream();
+        for (byte[] p : parts) bos.write(p);
+        return bos.toByteArray();
+    }
+
+    private static void runUntilEof(VideoStream s) {
+        s.run(); // returns when the InputStream hits EOF (IOException)
+    }
+
+    // ---- tests ----
+
+    @Test
+    public void happyPath_configureCsdKeyframeDelta() throws Exception {
+        byte[] csd      = new byte[]{0x67, 0x42, (byte)0xe0, 0x1e}; // bogus SPS-ish
+        byte[] keyframe = new byte[]{1, 2, 3, 4, 5};
+        byte[] delta    = new byte[]{6, 7, 8};
+
+        long PTS_CFG  = 1L << 62;             // CONFIG
+        long PTS_KEY  = (1L << 61) | 1_000_000L; // KEYFRAME, pts=1s
+        long PTS_DELT = 2_000_000L;           // pts=2s
+
+        byte[] bytes = cat(
+                fourcc(Wire.CODEC_H264),
+                sessionMeta(1080, 2400, false),
+                frame(PTS_CFG,  csd),
+                frame(PTS_KEY,  keyframe),
+                frame(PTS_DELT, delta));
+
+        RecordingFrames sink = new RecordingFrames();
+        VideoStream s = new VideoStream(new ByteArrayInputStream(bytes), sink,
+                (w, h) -> {});
+        runUntilEof(s);
+
+        assertEquals(1, sink.configs.size());
+        assertEquals(Wire.CODEC_H264, sink.configs.get(0).fourcc);
+        assertEquals(1080, sink.configs.get(0).w);
+        assertEquals(2400, sink.configs.get(0).h);
+
+        assertEquals(3, sink.feeds.size());
+        assertTrue("first is config", sink.feeds.get(0).isCfg);
+        assertEquals(0L, sink.feeds.get(0).ptsUs); // CONFIG strips pts to 0
+        assertEquals(4,  sink.feeds.get(0).data.length);
+
+        // keyframe: keyframe flag is stripped from ptsUs
+        assertEquals(1_000_000L, sink.feeds.get(1).ptsUs);
+        assertEquals(5,          sink.feeds.get(1).data.length);
+
+        assertEquals(2_000_000L, sink.feeds.get(2).ptsUs);
+    }
+
+    @Test
+    public void sessionMetaResizeTriggersReconfigure() throws Exception {
+        byte[] bytes = cat(
+                fourcc(Wire.CODEC_H264),
+                sessionMeta(1080, 2400, false),
+                frame(1L << 62, new byte[]{1}),     // config
+                sessionMeta(720, 1600, true),       // resize
+                frame(1L << 61, new byte[]{2}));    // keyframe at new size
+
+        RecordingFrames sink = new RecordingFrames();
+        new VideoStream(new ByteArrayInputStream(bytes), sink, null).run();
+
+        assertEquals(1, sink.configs.size());
+        assertEquals(1, sink.reconfigs.size());
+        assertEquals(720,  sink.reconfigs.get(0).w);
+        assertEquals(1600, sink.reconfigs.get(0).h);
+    }
+
+    @Test
+    public void sizeListenerFiresOnEachSessionMeta() throws Exception {
+        byte[] bytes = cat(
+                fourcc(Wire.CODEC_H264),
+                sessionMeta(1080, 2400, false),
+                frame(1L << 62, new byte[]{1}),
+                sessionMeta(720, 1600, false),
+                frame(1L << 61, new byte[]{2}));
+
+        List<int[]> sizes = new ArrayList<>();
+        RecordingFrames sink = new RecordingFrames();
+        new VideoStream(new ByteArrayInputStream(bytes), sink,
+                (w, h) -> sizes.add(new int[]{w, h})).run();
+
+        assertEquals(2, sizes.size());
+        assertEquals(1080, sizes.get(0)[0]);
+        assertEquals(720,  sizes.get(1)[0]);
+    }
+
+    @Test
+    public void disabledCodecExits() throws Exception {
+        byte[] bytes = fourcc(0);
+        RecordingFrames sink = new RecordingFrames();
+        new VideoStream(new ByteArrayInputStream(bytes), sink, null).run();
+        assertEquals(0, sink.configs.size());
+        assertEquals(0, sink.feeds.size());
+    }
+
+    @Test
+    public void frameBeforeSessionMetaIsRejected() throws Exception {
+        // A frame header arriving without a preceding session-meta should
+        // raise - the stream is unconfigured.
+        byte[] bytes = cat(
+                fourcc(Wire.CODEC_H264),
+                frame(1L << 62, new byte[]{1, 2, 3}));   // config-flag set, but no meta first
+        RecordingFrames sink = new RecordingFrames();
+        new VideoStream(new ByteArrayInputStream(bytes), sink, null).run();
+        // The loop should have aborted without feeding anything.
+        assertEquals(0, sink.feeds.size());
+        assertEquals(0, sink.configs.size());
+    }
+
+    @Test
+    public void recorderTapSeesMetaAndFramesWithFlags() throws Exception {
+        byte[] csd      = new byte[]{0x67, 0x42, (byte)0xe0, 0x1e};
+        byte[] keyframe = new byte[]{10, 11, 12};
+        byte[] delta    = new byte[]{20, 21};
+        long PTS_CFG  = 1L << 62;
+        long PTS_KEY  = (1L << 61) | 1_000_000L;
+        long PTS_DELT = 2_000_000L;
+
+        byte[] bytes = cat(
+                fourcc(Wire.CODEC_H264),
+                sessionMeta(800, 600, false),
+                frame(PTS_CFG,  csd),
+                frame(PTS_KEY,  keyframe),
+                frame(PTS_DELT, delta));
+
+        RecordingFrames sink = new RecordingFrames();
+        RecordingRecorder rec = new RecordingRecorder();
+        VideoStream s = new VideoStream(new ByteArrayInputStream(bytes), sink, null);
+        s.setRecorder(rec);
+        s.run();
+
+        assertEquals(1, rec.metas.size());
+        assertEquals(800, rec.metas.get(0)[1]);
+        assertEquals(600, rec.metas.get(0)[2]);
+
+        assertEquals(3, rec.frames.size());
+        assertTrue("cfg frame",  rec.frames.get(0).isConfig);
+        assertTrue("key frame",  rec.frames.get(1).isKeyframe);
+        assertTrue("delta is not config or key",
+                !rec.frames.get(2).isConfig && !rec.frames.get(2).isKeyframe);
+        assertEquals(csd.length,      rec.frames.get(0).data.length);
+        assertEquals(keyframe.length, rec.frames.get(1).data.length);
+        assertEquals(delta.length,    rec.frames.get(2).data.length);
+    }
+
+    private static final class RecordingRecorder implements VideoRecorder {
+        static final class FrameRec {
+            final byte[] data; final long ptsUs;
+            final boolean isConfig, isKeyframe;
+            FrameRec(byte[] d, long p, boolean c, boolean k) {
+                data = d; ptsUs = p; isConfig = c; isKeyframe = k;
+            }
+        }
+        final List<int[]>     metas  = new ArrayList<>();
+        final List<FrameRec>  frames = new ArrayList<>();
+        int closes = 0;
+        @Override public void onMeta(int f, int w, int h) { metas.add(new int[]{f, w, h}); }
+        @Override public void onFrame(byte[] d, long p, boolean c, boolean k) {
+            frames.add(new FrameRec(d, p, c, k));
+        }
+        @Override public void close() { closes++; }
+    }
+
+    @Test
+    public void payloadIntegrity() throws Exception {
+        byte[] payload = new byte[1024];
+        for (int i = 0; i < payload.length; i++) payload[i] = (byte) (i & 0xff);
+        byte[] bytes = cat(
+                fourcc(Wire.CODEC_H264),
+                sessionMeta(640, 480, false),
+                frame(1L << 62, payload));
+
+        RecordingFrames sink = new RecordingFrames();
+        new VideoStream(new ByteArrayInputStream(bytes), sink, null).run();
+        assertNotNull(sink.feeds.isEmpty() ? null : sink.feeds.get(0));
+        byte[] got = sink.feeds.get(0).data;
+        assertEquals(payload.length, got.length);
+        for (int i = 0; i < payload.length; i++) {
+            assertEquals("byte " + i, payload[i], got[i]);
+        }
+    }
+}
diff --git a/app/src/test/java/invalid/lena/scrcpy/WireTest.java b/app/src/test/java/invalid/lena/scrcpy/WireTest.java
new file mode 100644
index 0000000..9cee6c5
--- /dev/null
+++ b/app/src/test/java/invalid/lena/scrcpy/WireTest.java
@@ -0,0 +1,94 @@
+package invalid.lena.scrcpy;
+
+import static org.junit.Assert.assertArrayEquals;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.fail;
+
+import org.junit.Test;
+
+import java.io.ByteArrayInputStream;
+import java.io.EOFException;
+
+public class WireTest {
+
+    @Test
+    public void be32RoundTrip() {
+        byte[] b = new byte[4];
+        int[] cases = {0, 1, -1, 0x7fffffff, 0x80000000, 0x12345678};
+        for (int v : cases) {
+            Wire.writeBe32(b, 0, v);
+            assertEquals(v, Wire.readBe32(b, 0));
+        }
+    }
+
+    @Test
+    public void be32Layout() {
+        byte[] b = new byte[4];
+        Wire.writeBe32(b, 0, 0x12345678);
+        assertArrayEquals(new byte[]{0x12, 0x34, 0x56, 0x78}, b);
+    }
+
+    @Test
+    public void be64RoundTrip() {
+        byte[] b = new byte[8];
+        long[] cases = {0L, 1L, -1L, Long.MAX_VALUE, Long.MIN_VALUE, 0x0123456789abcdefL};
+        for (long v : cases) {
+            Wire.writeBe64(b, 0, v);
+            assertEquals(v, Wire.readBe64(b, 0));
+        }
+    }
+
+    @Test
+    public void le32RoundTrip() {
+        byte[] b = new byte[4];
+        int[] cases = {0, 1, -1, 0x7fffffff, 0x80000000, 0x12345678};
+        for (int v : cases) {
+            Wire.writeLe32(b, 0, v);
+            assertEquals(v, Wire.readLe32(b, 0));
+        }
+    }
+
+    @Test
+    public void le32Layout() {
+        byte[] b = new byte[4];
+        Wire.writeLe32(b, 0, 0x12345678);
+        assertArrayEquals(new byte[]{0x78, 0x56, 0x34, 0x12}, b);
+    }
+
+    @Test
+    public void readFullyShortStreamThrows() throws Exception {
+        ByteArrayInputStream in = new ByteArrayInputStream(new byte[3]);
+        byte[] buf = new byte[8];
+        try {
+            Wire.readFully(in, buf);
+            fail("expected EOFException");
+        } catch (EOFException ignored) {
+            // expected
+        }
+    }
+
+    @Test
+    public void fourccConstantsMatchScrcpy() {
+        // Big-endian uint32 of the 4-char ASCII tag, NUL-padded on the LEFT
+        // for short names (raw, aac) - mirrors AudioCodec / VideoCodec.
+        assertEquals(0x68_32_36_34, Wire.CODEC_H264);  // "h264"
+        assertEquals(0x68_32_36_35, Wire.CODEC_H265);  // "h265"
+        assertEquals(0x61_76_30_31, Wire.CODEC_AV1);   // "av01"
+        assertEquals(0x6f_70_75_73, Wire.CODEC_OPUS);  // "opus"
+        assertEquals(0x66_6c_61_63, Wire.CODEC_FLAC);  // "flac"
+        assertEquals(0x00_61_61_63, Wire.CODEC_AAC);   // "\0aac"
+        assertEquals(0x00_72_61_77, Wire.CODEC_RAW);   // "\0raw"
+    }
+
+    @Test
+    public void fourccName() {
+        assertEquals("h264", Wire.fourccName(Wire.CODEC_H264));
+        assertEquals("opus", Wire.fourccName(Wire.CODEC_OPUS));
+    }
+
+    @Test
+    public void fourccNameTrimsLeadingNuls() {
+        assertEquals("raw", Wire.fourccName(Wire.CODEC_RAW));
+        assertEquals("aac", Wire.fourccName(Wire.CODEC_AAC));
+    }
+}
-- 
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