Adapt FakeContext for Android 14

This fixes audio for Android 14 developer preview 2.

Fixes #3784 <https://github.com/Genymobile/scrcpy/issues/3784>

Suggested-by: Namelesswonder <Namelesswonder@users.noreply.github.com>

app/meson.build

@@ -277,6 +277,10 @@ if get_option('buildtype') == 'debug'
             'src/util/strbuf.c',
             'src/util/term.c',
         ]],
+        ['test_clock', [
+            'tests/test_clock.c',
+            'src/clock.c',
+        ]],
         ['test_control_msg_serialize', [
             'tests/test_control_msg_serialize.c',
             'src/control_msg.c',
@@ -306,8 +310,7 @@ if get_option('buildtype') == 'debug'
     ]
 
     foreach t : tests
-        sources = t[1] + ['src/compat.c']
-        exe = executable(t[0], sources,
+        exe = executable(t[0], t[1],
                          include_directories: src_dir,
                          dependencies: dependencies,
                          c_args: ['-DSDL_MAIN_HANDLED', '-DSC_TEST'])

app/src/clock.c

@@ -1,36 +1,116 @@
 #include "clock.h"
 
-#include <assert.h>
-
 #include "util/log.h"
 
 #define SC_CLOCK_NDEBUG // comment to debug
 
-#define SC_CLOCK_RANGE 32
-
 void
 sc_clock_init(struct sc_clock *clock) {
-    clock->range = 0;
-    clock->offset = 0;
+    clock->count = 0;
+    clock->head = 0;
+    clock->left_sum.system = 0;
+    clock->left_sum.stream = 0;
+    clock->right_sum.system = 0;
+    clock->right_sum.stream = 0;
+}
+
+// Estimate the affine function f(stream) = slope * stream + offset
+static void
+sc_clock_estimate(struct sc_clock *clock,
+                  double *out_slope, sc_tick *out_offset) {
+    assert(clock->count);
+
+    if (clock->count == 1) {
+        // If there is only 1 point, we can't compute a slope. Assume it is 1.
+        struct sc_clock_point *single_point = &clock->right_sum;
+        *out_slope = 1;
+        *out_offset = single_point->system - single_point->stream;
+        return;
+    }
+
+    struct sc_clock_point left_avg = {
+        .system = clock->left_sum.system / (clock->count / 2),
+        .stream = clock->left_sum.stream / (clock->count / 2),
+    };
+    struct sc_clock_point right_avg = {
+        .system = clock->right_sum.system / ((clock->count + 1) / 2),
+        .stream = clock->right_sum.stream / ((clock->count + 1) / 2),
+    };
+
+    double slope = (double) (right_avg.system - left_avg.system)
+                 / (right_avg.stream - left_avg.stream);
+
+    if (clock->count < SC_CLOCK_RANGE) {
+        /* The first frames are typically received and decoded with more delay
+         * than the others, causing a wrong slope estimation on start. To
+         * compensate, assume an initial slope of 1, then progressively use the
+         * estimated slope. */
+        slope = (clock->count * slope + (SC_CLOCK_RANGE - clock->count))
+              / SC_CLOCK_RANGE;
+    }
+
+    struct sc_clock_point global_avg = {
+        .system = (clock->left_sum.system + clock->right_sum.system)
+                 / clock->count,
+        .stream = (clock->left_sum.stream + clock->right_sum.stream)
+                 / clock->count,
+    };
+
+    sc_tick offset = global_avg.system - (sc_tick) (global_avg.stream * slope);
+
+    *out_slope = slope;
+    *out_offset = offset;
 }
 
 void
 sc_clock_update(struct sc_clock *clock, sc_tick system, sc_tick stream) {
-    if (clock->range < SC_CLOCK_RANGE) {
-        ++clock->range;
+    struct sc_clock_point *point = &clock->points[clock->head];
+
+    if (clock->count == SC_CLOCK_RANGE || clock->count & 1) {
+        // One point passes from the right sum to the left sum
+
+        unsigned mid;
+        if (clock->count == SC_CLOCK_RANGE) {
+            mid = (clock->head + SC_CLOCK_RANGE / 2) % SC_CLOCK_RANGE;
+        } else {
+            // Only for the first frames
+            mid = clock->count / 2;
+        }
+
+        struct sc_clock_point *mid_point = &clock->points[mid];
+        clock->left_sum.system += mid_point->system;
+        clock->left_sum.stream += mid_point->stream;
+        clock->right_sum.system -= mid_point->system;
+        clock->right_sum.stream -= mid_point->stream;
     }
 
-    sc_tick offset = system - stream;
-    clock->offset = ((clock->range - 1) * clock->offset + offset)
-                  / clock->range;
+    if (clock->count == SC_CLOCK_RANGE) {
+        // The current point overwrites the previous value in the circular
+        // array, update the left sum accordingly
+        clock->left_sum.system -= point->system;
+        clock->left_sum.stream -= point->stream;
+    } else {
+        ++clock->count;
+    }
+
+    point->system = system;
+    point->stream = stream;
+
+    clock->right_sum.system += system;
+    clock->right_sum.stream += stream;
+
+    clock->head = (clock->head + 1) % SC_CLOCK_RANGE;
+
+    // Update estimation
+    sc_clock_estimate(clock, &clock->slope, &clock->offset);
 
 #ifndef SC_CLOCK_NDEBUG
-    LOGD("Clock estimation: pts + %" PRItick, clock->offset);
+    LOGD("Clock estimation: %f * pts + %" PRItick, clock->slope, clock->offset);
 #endif
 }
 
 sc_tick
 sc_clock_to_system_time(struct sc_clock *clock, sc_tick stream) {
-    assert(clock->range); // sc_clock_update() must have been called
-    return stream + clock->offset;
+    assert(clock->count); // sc_clock_update() must have been called
+    return (sc_tick) (stream * clock->slope) + clock->offset;
 }

app/src/clock.h

@@ -3,8 +3,13 @@
 
 #include "common.h"
 
+#include <assert.h>
+
 #include "util/tick.h"
 
+#define SC_CLOCK_RANGE 32
+static_assert(!(SC_CLOCK_RANGE & 1), "SC_CLOCK_RANGE must be even");
+
 struct sc_clock_point {
     sc_tick system;
     sc_tick stream;
@@ -16,18 +21,40 @@ struct sc_clock_point {
  *
  *     f(stream) = slope * stream + offset
  *
- * Theoretically, the slope encodes the drift between the device clock and the
- * computer clock. It is expected to be very close to 1.
+ * To that end, it stores the SC_CLOCK_RANGE last clock points (the timestamps
+ * of a frame expressed both in stream time and system time) in a circular
+ * array.
  *
- * Since the clock is used to estimate very close points in the future (which
- * are reestimated on every clock update, see delay_buffer), the error caused
- * by clock drift is totally negligible, so it is better to assume that the
- * slope is 1 than to estimate it (the estimation error would be larger).
+ * To estimate the slope, it splits the last SC_CLOCK_RANGE points into two
+ * sets of SC_CLOCK_RANGE/2 points, and computes their centroid ("average
+ * point"). The slope of the estimated affine function is that of the line
+ * passing through these two points.
  *
- * Therefore, only the offset is estimated.
+ * To estimate the offset, it computes the centroid of all the SC_CLOCK_RANGE
+ * points. The resulting affine function passes by this centroid.
+ *
+ * With a circular array, the rolling sums (and average) are quick to compute.
+ * In practice, the estimation is stable and the evolution is smooth.
  */
 struct sc_clock {
-    unsigned range;
+    // Circular array
+    struct sc_clock_point points[SC_CLOCK_RANGE];
+
+    // Number of points in the array (count <= SC_CLOCK_RANGE)
+    unsigned count;
+
+    // Index of the next point to write
+    unsigned head;
+
+    // Sum of the first count/2 points
+    struct sc_clock_point left_sum;
+
+    // Sum of the last (count+1)/2 points
+    struct sc_clock_point right_sum;
+
+    // Estimated slope and offset
+    // (computed on sc_clock_update(), used by sc_clock_to_system_time())
+    double slope;
     sc_tick offset;
 };
 

app/src/delay_buffer.c

@@ -194,7 +194,7 @@ sc_delay_buffer_frame_sink_push(struct sc_frame_sink *sink,
     sc_clock_update(&db->clock, sc_tick_now(), pts);
     sc_cond_signal(&db->wait_cond);
 
-    if (db->first_frame_asap && db->clock.range == 1) {
+    if (db->first_frame_asap && db->clock.count == 1) {
         sc_mutex_unlock(&db->mutex);
         return sc_frame_source_sinks_push(&db->frame_source, frame);
     }

app/tests/test_clock.c

@@ -0,0 +1,79 @@
+#include "common.h"
+
+#include <assert.h>
+
+#include "clock.h"
+
+void test_small_rolling_sum(void) {
+    struct sc_clock clock;
+    sc_clock_init(&clock);
+
+    assert(clock.count == 0);
+    assert(clock.left_sum.system == 0);
+    assert(clock.left_sum.stream == 0);
+    assert(clock.right_sum.system == 0);
+    assert(clock.right_sum.stream == 0);
+
+    sc_clock_update(&clock, 2, 3);
+    assert(clock.count == 1);
+    assert(clock.left_sum.system == 0);
+    assert(clock.left_sum.stream == 0);
+    assert(clock.right_sum.system == 2);
+    assert(clock.right_sum.stream == 3);
+
+    sc_clock_update(&clock, 10, 20);
+    assert(clock.count == 2);
+    assert(clock.left_sum.system == 2);
+    assert(clock.left_sum.stream == 3);
+    assert(clock.right_sum.system == 10);
+    assert(clock.right_sum.stream == 20);
+
+    sc_clock_update(&clock, 40, 80);
+    assert(clock.count == 3);
+    assert(clock.left_sum.system == 2);
+    assert(clock.left_sum.stream == 3);
+    assert(clock.right_sum.system == 50);
+    assert(clock.right_sum.stream == 100);
+
+    sc_clock_update(&clock, 400, 800);
+    assert(clock.count == 4);
+    assert(clock.left_sum.system == 12);
+    assert(clock.left_sum.stream == 23);
+    assert(clock.right_sum.system == 440);
+    assert(clock.right_sum.stream == 880);
+}
+
+void test_large_rolling_sum(void) {
+    const unsigned half_range = SC_CLOCK_RANGE / 2;
+
+    struct sc_clock clock1;
+    sc_clock_init(&clock1);
+    for (unsigned i = 0; i < 5 * half_range; ++i) {
+        sc_clock_update(&clock1, i, 2 * i + 1);
+    }
+
+    struct sc_clock clock2;
+    sc_clock_init(&clock2);
+    for (unsigned i = 3 * half_range; i < 5 * half_range; ++i) {
+        sc_clock_update(&clock2, i, 2 * i + 1);
+    }
+
+    assert(clock1.count == SC_CLOCK_RANGE);
+    assert(clock2.count == SC_CLOCK_RANGE);
+
+    // The values before the last SC_CLOCK_RANGE points in clock1 should have
+    // no impact
+    assert(clock1.left_sum.system == clock2.left_sum.system);
+    assert(clock1.left_sum.stream == clock2.left_sum.stream);
+    assert(clock1.right_sum.system == clock2.right_sum.system);
+    assert(clock1.right_sum.stream == clock2.right_sum.stream);
+}
+
+int main(int argc, char *argv[]) {
+    (void) argc;
+    (void) argv;
+
+    test_small_rolling_sum();
+    test_large_rolling_sum();
+    return 0;
+};

server/build_without_gradle.sh

@@ -14,8 +14,8 @@ set -e
 SCRCPY_DEBUG=false
 SCRCPY_VERSION_NAME=2.0
 
-PLATFORM=${ANDROID_PLATFORM:-23}
-BUILD_TOOLS=${ANDROID_BUILD_TOOLS:-23.0.3}
+PLATFORM=${ANDROID_PLATFORM:-33}
+BUILD_TOOLS=${ANDROID_BUILD_TOOLS:-33.0.0}
 BUILD_TOOLS_DIR="$ANDROID_HOME/build-tools/$BUILD_TOOLS"
 
 BUILD_DIR="$(realpath ${BUILD_DIR:-build_manual})"
@@ -43,17 +43,6 @@ public final class BuildConfig {
 }
 EOF
 
-STUBS_DIR="$BUILD_DIR/stubs"
-rm -rf "$STUBS_DIR"
-mkdir -p "$STUBS_DIR"
-echo "Generating SDK stubs..."
-cd "$SERVER_DIR/src/main/stubs"
-javac -bootclasspath "$ANDROID_JAR" \
-    -d "$STUBS_DIR" \
-    -source 1.8 -target 1.8 \
-    android/content/*
-cd -
-
 echo "Generating java from aidl..."
 cd "$SERVER_DIR/src/main/aidl"
 "$BUILD_TOOLS_DIR/aidl" -o"$GEN_DIR" android/view/IRotationWatcher.aidl
@@ -63,7 +52,7 @@ cd "$SERVER_DIR/src/main/aidl"
 echo "Compiling java sources..."
 cd ../java
 javac -bootclasspath "$ANDROID_JAR" \
-    -cp "$LAMBDA_JAR:$GEN_DIR:$STUBS_DIR" \
+    -cp "$LAMBDA_JAR:$GEN_DIR" \
     -d "$CLASSES_DIR" \
     -source 1.8 -target 1.8 \
     com/genymobile/scrcpy/*.java \

server/src/main/java/com/genymobile/scrcpy/AudioCapture.java

@@ -5,7 +5,6 @@ import com.genymobile.scrcpy.wrappers.ServiceManager;
 import android.annotation.SuppressLint;
 import android.annotation.TargetApi;
 import android.content.ComponentName;
-import android.content.Context;
 import android.content.Intent;
 import android.media.AudioFormat;
 import android.media.AudioRecord;
@@ -15,7 +14,6 @@ import android.media.MediaRecorder;
 import android.os.Build;
 import android.os.SystemClock;
 
-import java.lang.reflect.Method;
 import java.nio.ByteBuffer;
 
 public final class AudioCapture {
@@ -44,28 +42,13 @@ public final class AudioCapture {
         return builder.build();
     }
 
-    private static Method setBuilderContext;
-
-    @TargetApi(23)
-    private static void setBuilderContext(AudioRecord.Builder builder, Context context) {
-        try {
-            if (setBuilderContext == null) {
-                setBuilderContext = AudioRecord.Builder.class.getMethod("setContext", Context.class);
-            }
-            setBuilderContext.invoke(builder, context);
-        } catch (Exception e) {
-            Ln.e("Could not call AudioRecord.Builder.setContext() method");
-            //throw new RuntimeException(e);
-        }
-    }
-
     @TargetApi(Build.VERSION_CODES.M)
     @SuppressLint({"WrongConstant", "MissingPermission"})
     private static AudioRecord createAudioRecord() {
         AudioRecord.Builder builder = new AudioRecord.Builder();
-        if (Build.VERSION.SDK_INT >= 31) {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
             // On older APIs, Workarounds.fillAppInfo() must be called beforehand
-            setBuilderContext(builder, FakeContext.get());
+            builder.setContext(FakeContext.get());
         }
         builder.setAudioSource(MediaRecorder.AudioSource.REMOTE_SUBMIX);
         builder.setAudioFormat(createAudioFormat());
@@ -119,7 +102,7 @@ public final class AudioCapture {
     }
 
     public void start() throws AudioCaptureForegroundException {
-        if (Build.VERSION.SDK_INT == 30) {
+        if (Build.VERSION.SDK_INT == Build.VERSION_CODES.R) {
             startWorkaroundAndroid11();
             try {
                 tryStartRecording(3, 100);
@@ -138,21 +121,7 @@ public final class AudioCapture {
         }
     }
 
-    private static Method getTimestampMethod;
-
-    private static int getRecorderTimestamp(AudioRecord recorder, AudioTimestamp timestamp) {
-        try {
-            if (getTimestampMethod == null) {
-                getTimestampMethod = AudioRecord.class.getMethod("getTimestamp", AudioTimestamp.class, int.class);
-            }
-            return (int) getTimestampMethod.invoke(recorder, timestamp, 0);
-        } catch (Exception e) {
-            Ln.e("Could not call AudioRecord.getTimestamp() method");
-            return AudioRecord.ERROR;
-        }
-    }
-
-    @TargetApi(24)
+    @TargetApi(Build.VERSION_CODES.N)
     public int read(ByteBuffer directBuffer, int size, MediaCodec.BufferInfo outBufferInfo) {
         int r = recorder.read(directBuffer, size);
         if (r <= 0) {
@@ -161,7 +130,7 @@ public final class AudioCapture {
 
         long pts;
 
-        int ret = getRecorderTimestamp(recorder, timestamp);
+        int ret = recorder.getTimestamp(timestamp, AudioTimestamp.TIMEBASE_MONOTONIC);
         if (ret == AudioRecord.SUCCESS) {
             pts = timestamp.nanoTime / 1000;
         } else {

server/src/main/java/com/genymobile/scrcpy/AudioEncoder.java

@@ -84,7 +84,7 @@ public final class AudioEncoder implements AsyncProcessor {
         return format;
     }
 
-    @TargetApi(24)
+    @TargetApi(Build.VERSION_CODES.N)
     private void inputThread(MediaCodec mediaCodec, AudioCapture capture) throws IOException, InterruptedException {
         final MediaCodec.BufferInfo bufferInfo = new MediaCodec.BufferInfo();
 
@@ -159,7 +159,7 @@ public final class AudioEncoder implements AsyncProcessor {
 
     @TargetApi(Build.VERSION_CODES.M)
     public void encode() throws IOException, ConfigurationException, AudioCaptureForegroundException {
-        if (Build.VERSION.SDK_INT < 30) {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.R) {
             Ln.w("Audio disabled: it is not supported before Android 11");
             streamer.writeDisableStream(false);
             return;
@@ -290,7 +290,7 @@ public final class AudioEncoder implements AsyncProcessor {
     }
 
     private class EncoderCallback extends MediaCodec.Callback {
-        @TargetApi(24)
+        @TargetApi(Build.VERSION_CODES.N)
         @Override
         public void onInputBufferAvailable(MediaCodec codec, int index) {
             try {

server/src/main/java/com/genymobile/scrcpy/Controller.java

@@ -373,8 +373,8 @@ public class Controller implements AsyncProcessor {
 
     private void getClipboard(int copyKey) {
         // On Android >= 7, press the COPY or CUT key if requested
-        if (copyKey != ControlMessage.COPY_KEY_NONE && Build.VERSION.SDK_INT >= 24 && device.supportsInputEvents()) {
-            int key = copyKey == ControlMessage.COPY_KEY_COPY ? 278 : 277;
+        if (copyKey != ControlMessage.COPY_KEY_NONE && Build.VERSION.SDK_INT >= Build.VERSION_CODES.N && device.supportsInputEvents()) {
+            int key = copyKey == ControlMessage.COPY_KEY_COPY ? KeyEvent.KEYCODE_COPY : KeyEvent.KEYCODE_CUT;
             // Wait until the event is finished, to ensure that the clipboard text we read just after is the correct one
             device.pressReleaseKeycode(key, Device.INJECT_MODE_WAIT_FOR_FINISH);
         }
@@ -397,8 +397,8 @@ public class Controller implements AsyncProcessor {
         }
 
         // On Android >= 7, also press the PASTE key if requested
-        if (paste && Build.VERSION.SDK_INT >= 24 && device.supportsInputEvents()) {
-            device.pressReleaseKeycode(279, Device.INJECT_MODE_ASYNC);
+        if (paste && Build.VERSION.SDK_INT >= Build.VERSION_CODES.N && device.supportsInputEvents()) {
+            device.pressReleaseKeycode(KeyEvent.KEYCODE_PASTE, Device.INJECT_MODE_ASYNC);
         }
 
         if (sequence != ControlMessage.SEQUENCE_INVALID) {

server/src/main/java/com/genymobile/scrcpy/DesktopConnection.java

@@ -68,8 +68,7 @@ public final class DesktopConnection implements Closeable {
         LocalSocket controlSocket = null;
         try {
             if (tunnelForward) {
-                LocalServerSocket localServerSocket = new LocalServerSocket(socketName);
-                try {
+                try (LocalServerSocket localServerSocket = new LocalServerSocket(socketName)) {
                     videoSocket = localServerSocket.accept();
                     if (sendDummyByte) {
                         // send one byte so the client may read() to detect a connection error
@@ -81,8 +80,6 @@ public final class DesktopConnection implements Closeable {
                     if (control) {
                         controlSocket = localServerSocket.accept();
                     }
-                } finally {
-                    localServerSocket.close();
                 }
             } else {
                 videoSocket = connect(socketName);

server/src/main/java/com/genymobile/scrcpy/Device.java

@@ -124,7 +124,7 @@ public final class Device {
         }
 
         // main display or any display on Android >= Q
-        supportsInputEvents = displayId == 0 || Build.VERSION.SDK_INT >= 29;
+        supportsInputEvents = displayId == 0 || Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q;
         if (!supportsInputEvents) {
             Ln.w("Input events are not supported for secondary displays before Android 10");
         }
@@ -173,7 +173,7 @@ public final class Device {
     }
 
     public static boolean supportsInputEvents(int displayId) {
-        return displayId == 0 || Build.VERSION.SDK_INT >= 29;
+        return displayId == 0 || Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q;
     }
 
     public boolean supportsInputEvents() {
@@ -277,7 +277,7 @@ public final class Device {
      * @param mode one of the {@code POWER_MODE_*} constants
      */
     public static boolean setScreenPowerMode(int mode) {
-        if (Build.VERSION.SDK_INT >= 29) {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
             // Change the power mode for all physical displays
             long[] physicalDisplayIds = SurfaceControl.getPhysicalDisplayIds();
             if (physicalDisplayIds == null) {

server/src/main/java/com/genymobile/scrcpy/FakeContext.java

@@ -26,13 +26,15 @@ public final class FakeContext extends ContextWrapper {
         return PACKAGE_NAME;
     }
 
+    @Override
     public String getOpPackageName() {
         return PACKAGE_NAME;
     }
 
-    @TargetApi(31)
+    @TargetApi(Build.VERSION_CODES.S)
+    @Override
     public AttributionSource getAttributionSource() {
-        AttributionSource.Builder builder = new AttributionSource.Builder(0);
+        AttributionSource.Builder builder = new AttributionSource.Builder(Process.SHELL_UID);
         builder.setPackageName(PACKAGE_NAME);
         return builder.build();
     }

server/src/main/java/com/genymobile/scrcpy/ScreenEncoder.java

@@ -252,7 +252,7 @@ public class ScreenEncoder implements Device.RotationListener {
     private static IBinder createDisplay() {
         // Since Android 12 (preview), secure displays could not be created with shell permissions anymore.
         // On Android 12 preview, SDK_INT is still R (not S), but CODENAME is "S".
-        boolean secure = Build.VERSION.SDK_INT < 30 || (Build.VERSION.SDK_INT == 30 && !"S"
+        boolean secure = Build.VERSION.SDK_INT < Build.VERSION_CODES.R || (Build.VERSION.SDK_INT == Build.VERSION_CODES.R && !"S"
                 .equals(Build.VERSION.CODENAME));
         return SurfaceControl.createDisplay("scrcpy", secure);
     }

server/src/main/java/com/genymobile/scrcpy/Server.java

@@ -88,7 +88,7 @@ public final class Server {
         // Before Android 11, audio is not supported.
         // Since Android 12, we can properly set a context on the AudioRecord.
         // Only on Android 11 we must fill the application context for the AudioRecord to work.
-        if (audio && Build.VERSION.SDK_INT == 30) {
+        if (audio && Build.VERSION.SDK_INT == Build.VERSION_CODES.R) {
             Workarounds.fillAppContext();
         }
 

server/src/main/java/com/genymobile/scrcpy/Settings.java

@@ -34,7 +34,7 @@ public final class Settings {
     }
 
     public static String getValue(String table, String key) throws SettingsException {
-        if (Build.VERSION.SDK_INT <= 30) {
+        if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.R) {
             // on Android >= 12, it always fails: <https://github.com/Genymobile/scrcpy/issues/2788>
             try (ContentProvider provider = ServiceManager.getActivityManager().createSettingsProvider()) {
                 return provider.getValue(table, key);
@@ -47,7 +47,7 @@ public final class Settings {
     }
 
     public static void putValue(String table, String key, String value) throws SettingsException {
-        if (Build.VERSION.SDK_INT <= 30) {
+        if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.R) {
             // on Android >= 12, it always fails: <https://github.com/Genymobile/scrcpy/issues/2788>
             try (ContentProvider provider = ServiceManager.getActivityManager().createSettingsProvider()) {
                 provider.putValue(table, key, value);
@@ -60,7 +60,7 @@ public final class Settings {
     }
 
     public static String getAndPutValue(String table, String key, String value) throws SettingsException {
-        if (Build.VERSION.SDK_INT <= 30) {
+        if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.R) {
             // on Android >= 12, it always fails: <https://github.com/Genymobile/scrcpy/issues/2788>
             try (ContentProvider provider = ServiceManager.getActivityManager().createSettingsProvider()) {
                 String oldValue = provider.getValue(table, key);

server/src/main/java/com/genymobile/scrcpy/VideoCodec.java

@@ -7,7 +7,7 @@ public enum VideoCodec implements Codec {
     H264(0x68_32_36_34, "h264", MediaFormat.MIMETYPE_VIDEO_AVC),
     H265(0x68_32_36_35, "h265", MediaFormat.MIMETYPE_VIDEO_HEVC),
     @SuppressLint("InlinedApi") // introduced in API 21
-    AV1(0x00_61_76_31, "av1", "video/av01");
+    AV1(0x00_61_76_31, "av1", MediaFormat.MIMETYPE_VIDEO_AV1);
 
     private final int id; // 4-byte ASCII representation of the name
     private final String name;

server/src/main/java/com/genymobile/scrcpy/wrappers/ActivityManager.java

@@ -51,7 +51,7 @@ public class ActivityManager {
         return removeContentProviderExternalMethod;
     }
 
-    @TargetApi(29)
+    @TargetApi(Build.VERSION_CODES.Q)
     private ContentProvider getContentProviderExternal(String name, IBinder token) {
         try {
             Method method = getGetContentProviderExternalMethod();

server/src/main/java/com/genymobile/scrcpy/wrappers/ClipboardManager.java

@@ -26,7 +26,7 @@ public class ClipboardManager {
 
     private Method getGetPrimaryClipMethod() throws NoSuchMethodException {
         if (getPrimaryClipMethod == null) {
-            if (Build.VERSION.SDK_INT < 29) {
+            if (Build.VERSION.SDK_INT < Build.VERSION_CODES.Q) {
                 getPrimaryClipMethod = manager.getClass().getMethod("getPrimaryClip", String.class);
             } else {
                 try {
@@ -48,7 +48,7 @@ public class ClipboardManager {
 
     private Method getSetPrimaryClipMethod() throws NoSuchMethodException {
         if (setPrimaryClipMethod == null) {
-            if (Build.VERSION.SDK_INT < 29) {
+            if (Build.VERSION.SDK_INT < Build.VERSION_CODES.Q) {
                 setPrimaryClipMethod = manager.getClass().getMethod("setPrimaryClip", ClipData.class, String.class);
             } else {
                 try {
@@ -71,7 +71,7 @@ public class ClipboardManager {
 
     private static ClipData getPrimaryClip(Method method, int methodVersion, IInterface manager)
             throws InvocationTargetException, IllegalAccessException {
-        if (Build.VERSION.SDK_INT < 29) {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.Q) {
             return (ClipData) method.invoke(manager, FakeContext.PACKAGE_NAME);
         }
 
@@ -87,7 +87,7 @@ public class ClipboardManager {
 
     private static void setPrimaryClip(Method method, int methodVersion, IInterface manager, ClipData clipData)
             throws InvocationTargetException, IllegalAccessException {
-        if (Build.VERSION.SDK_INT < 29) {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.Q) {
             method.invoke(manager, clipData, FakeContext.PACKAGE_NAME);
             return;
         }
@@ -133,7 +133,7 @@ public class ClipboardManager {
 
     private static void addPrimaryClipChangedListener(Method method, int methodVersion, IInterface manager,
             IOnPrimaryClipChangedListener listener) throws InvocationTargetException, IllegalAccessException {
-        if (Build.VERSION.SDK_INT < 29) {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.Q) {
             method.invoke(manager, listener, FakeContext.PACKAGE_NAME);
             return;
         }
@@ -153,7 +153,7 @@ public class ClipboardManager {
 
     private Method getAddPrimaryClipChangedListener() throws NoSuchMethodException {
         if (addPrimaryClipChangedListener == null) {
-            if (Build.VERSION.SDK_INT < 29) {
+            if (Build.VERSION.SDK_INT < Build.VERSION_CODES.Q) {
                 addPrimaryClipChangedListener = manager.getClass()
                         .getMethod("addPrimaryClipChangedListener", IOnPrimaryClipChangedListener.class, String.class);
             } else {

server/src/main/java/com/genymobile/scrcpy/wrappers/ContentProvider.java

@@ -54,7 +54,7 @@ public class ContentProvider implements Closeable {
     @SuppressLint("PrivateApi")
     private Method getCallMethod() throws NoSuchMethodException {
         if (callMethod == null) {
-            if (Build.VERSION.SDK_INT >= 31) {
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
                 callMethod = provider.getClass().getMethod("call", AttributionSource.class, String.class, String.class, String.class, Bundle.class);
                 callMethodVersion = 0;
             } else {
@@ -83,7 +83,7 @@ public class ContentProvider implements Closeable {
             Method method = getCallMethod();
             Object[] args;
 
-            if (Build.VERSION.SDK_INT >= 31 && callMethodVersion == 0) {
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S && callMethodVersion == 0) {
                 args = new Object[]{FakeContext.get().getAttributionSource(), "settings", callMethod, arg, extras};
             } else {
                 switch (callMethodVersion) {

server/src/main/java/com/genymobile/scrcpy/wrappers/SurfaceControl.java

@@ -90,7 +90,7 @@ public final class SurfaceControl {
         if (getBuiltInDisplayMethod == null) {
             // the method signature has changed in Android Q
             // <https://github.com/Genymobile/scrcpy/issues/586>
-            if (Build.VERSION.SDK_INT < 29) {
+            if (Build.VERSION.SDK_INT < Build.VERSION_CODES.Q) {
                 getBuiltInDisplayMethod = CLASS.getMethod("getBuiltInDisplay", int.class);
             } else {
                 getBuiltInDisplayMethod = CLASS.getMethod("getInternalDisplayToken");
@@ -102,7 +102,7 @@ public final class SurfaceControl {
     public static IBinder getBuiltInDisplay() {
         try {
             Method method = getGetBuiltInDisplayMethod();
-            if (Build.VERSION.SDK_INT < 29) {
+            if (Build.VERSION.SDK_INT < Build.VERSION_CODES.Q) {
                 // call getBuiltInDisplay(0)
                 return (IBinder) method.invoke(null, 0);
             }

server/src/main/stubs/android/content/AttributionSource.java

@@ -1,15 +0,0 @@
-package android.content;
-
-public class AttributionSource {
-    public static class Builder {
-        public Builder(int uid) {
-            throw new UnsupportedOperationException();
-        }
-        public Builder setPackageName(String value) {
-            throw new UnsupportedOperationException();
-        }
-        public AttributionSource build() {
-            throw new UnsupportedOperationException();
-        }
-    }
-}