Make dav1d extension publicly available for use with Media3

PiperOrigin-RevId: 765118027

Author: rohitjoins

core_settings.gradle

@@ -73,6 +73,8 @@ include modulePrefix + 'lib-decoder'
 project(modulePrefix + 'lib-decoder').projectDir = new File(rootDir, 'libraries/decoder')
 include modulePrefix + 'lib-decoder-av1'
 project(modulePrefix + 'lib-decoder-av1').projectDir = new File(rootDir, 'libraries/decoder_av1')
+include modulePrefix + 'lib-decoder-dav1d'
+project(modulePrefix + 'lib-decoder-dav1d').projectDir = new File(rootDir, 'libraries/decoder_dav1d')
 include modulePrefix + 'lib-decoder-ffmpeg'
 project(modulePrefix + 'lib-decoder-ffmpeg').projectDir = new File(rootDir, 'libraries/decoder_ffmpeg')
 include modulePrefix + 'lib-decoder-flac'

demos/main/build.gradle

@@ -83,6 +83,7 @@ dependencies {
     implementation project(modulePrefix + 'lib-datasource-cronet')
     implementation project(modulePrefix + 'lib-exoplayer-ima')
     withDecoderExtensionsImplementation project(modulePrefix + 'lib-decoder-av1')
+    withDecoderExtensionsImplementation project(modulePrefix + 'lib-decoder-dav1d')
     withDecoderExtensionsImplementation project(modulePrefix + 'lib-decoder-ffmpeg')
     withDecoderExtensionsImplementation project(modulePrefix + 'lib-decoder-flac')
     withDecoderExtensionsImplementation project(modulePrefix + 'lib-decoder-opus')

libraries/exoplayer/proguard-rules.txt

@@ -9,6 +9,10 @@
 -keepclassmembers class androidx.media3.decoder.av1.Libgav1VideoRenderer {
   <init>(long, android.os.Handler, androidx.media3.exoplayer.video.VideoRendererEventListener, int);
 }
+-dontnote androidx.media3.decoder.av1.Libdav1dVideoRenderer
+-keepclassmembers class androidx.media3.decoder.av1.Libdav1dVideoRenderer {
+  <init>(long, android.os.Handler, androidx.media3.exoplayer.video.VideoRendererEventListener, int);
+}
 -dontnote androidx.media3.decoder.ffmpeg.ExperimentalFfmpegVideoRenderer
 -keepclassmembers class androidx.media3.decoder.ffmpeg.ExperimentalFfmpegVideoRenderer {
   <init>(long, android.os.Handler, androidx.media3.exoplayer.video.VideoRendererEventListener, int);

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/DefaultRenderersFactory.java

@@ -486,6 +486,35 @@ protected void buildVideoRenderers(
       throw new IllegalStateException("Error instantiating VP9 extension", e);
     }
 
+    try {
+      // LINT.IfChange
+      Class<?> clazz = Class.forName("androidx.media3.decoder.dav1d.Libdav1dVideoRenderer");
+      // Full class names used for media3 constructor args so the LINT rule triggers if any of them
+      // move.
+      @SuppressWarnings("UnnecessarilyFullyQualified")
+      Constructor<?> constructor =
+          clazz.getConstructor(
+              long.class,
+              Handler.class,
+              androidx.media3.exoplayer.video.VideoRendererEventListener.class,
+              int.class);
+      // LINT.ThenChange(../../../../../../proguard-rules.txt)
+      Renderer renderer =
+          (Renderer)
+              constructor.newInstance(
+                  allowedVideoJoiningTimeMs,
+                  eventHandler,
+                  eventListener,
+                  MAX_DROPPED_VIDEO_FRAME_COUNT_TO_NOTIFY);
+      out.add(extensionRendererIndex++, renderer);
+      Log.i(TAG, "Loaded Libdav1dVideoRenderer.");
+    } catch (ClassNotFoundException e) {
+      // Expected if the app was built without the extension.
+    } catch (Exception e) {
+      // The extension is present, but instantiation failed.
+      throw new IllegalStateException("Error instantiating dav1d AV1 extension", e);
+    }
+
     try {
       // LINT.IfChange
       Class<?> clazz = Class.forName("androidx.media3.decoder.av1.Libgav1VideoRenderer");