Signal fallback via renderer constructor

Remove MediaCodecSelector.DEFAULT_WITH_FALLBACK, as codec selectors
will need to be able to return a list of decoder infos even when not
using fallback in a later change. Instead signal that fallback should
be used via a renderer constructor.

Fallback is always disabled for audio.

PiperOrigin-RevId: 242454172

RELEASENOTES.md

@@ -102,6 +102,9 @@
   ([#5698](https://github.com/google/ExoPlayer/issues/5698),
   [#5694](https://github.com/google/ExoPlayer/issues/5694)).
 * Move `PriorityTaskManager` from `DefaultLoadControl` to `SimpleExoPlayer`.
+* Remove `MediaCodecSelector.DEFAULT_WITH_FALLBACK`. Apps should instead signal
+  that fallback should be used by passing `true` as the `enableDecoderFallback`
+  parameter when instantiating the video renderer.
 
 ### 2.9.6 ###
 

library/core/src/main/java/com/google/android/exoplayer2/audio/MediaCodecAudioRenderer.java

@@ -250,6 +250,7 @@ public class MediaCodecAudioRenderer extends MediaCodecRenderer implements Media
         mediaCodecSelector,
         drmSessionManager,
         playClearSamplesWithoutKeys,
+        /* enableDecoderFallback= */ false,
         /* assumedMinimumCodecOperatingRate= */ 44100);
     this.context = context.getApplicationContext();
     this.audioSink = audioSink;

library/core/src/main/java/com/google/android/exoplayer2/mediacodec/MediaCodecRenderer.java

@@ -53,6 +53,7 @@ import java.lang.annotation.RetentionPolicy;
 import java.nio.ByteBuffer;
 import java.util.ArrayDeque;
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.List;
 
 /**
@@ -289,6 +290,7 @@ public abstract class MediaCodecRenderer extends BaseRenderer {
   private final MediaCodecSelector mediaCodecSelector;
   @Nullable private final DrmSessionManager<FrameworkMediaCrypto> drmSessionManager;
   private final boolean playClearSamplesWithoutKeys;
+  private final boolean enableDecoderFallback;
   private final float assumedMinimumCodecOperatingRate;
   private final DecoderInputBuffer buffer;
   private final DecoderInputBuffer flagsOnlyBuffer;
@@ -354,6 +356,9 @@ public abstract class MediaCodecRenderer extends BaseRenderer {
    *     begin in parallel with key acquisition. This parameter specifies whether the renderer is
    *     permitted to play clear regions of encrypted media files before {@code drmSessionManager}
    *     has obtained the keys necessary to decrypt encrypted regions of the media.
+   * @param enableDecoderFallback Whether to enable fallback to lower-priority decoders if decoder
+   *     initialization fails. This may result in using a decoder that is less efficient or slower
+   *     than the primary decoder.
    * @param assumedMinimumCodecOperatingRate A codec operating rate that all codecs instantiated by
    *     this renderer are assumed to meet implicitly (i.e. without the operating rate being set
    *     explicitly using {@link MediaFormat#KEY_OPERATING_RATE}).
@@ -363,11 +368,13 @@ public abstract class MediaCodecRenderer extends BaseRenderer {
       MediaCodecSelector mediaCodecSelector,
       @Nullable DrmSessionManager<FrameworkMediaCrypto> drmSessionManager,
       boolean playClearSamplesWithoutKeys,
+      boolean enableDecoderFallback,
       float assumedMinimumCodecOperatingRate) {
     super(trackType);
     this.mediaCodecSelector = Assertions.checkNotNull(mediaCodecSelector);
     this.drmSessionManager = drmSessionManager;
     this.playClearSamplesWithoutKeys = playClearSamplesWithoutKeys;
+    this.enableDecoderFallback = enableDecoderFallback;
     this.assumedMinimumCodecOperatingRate = assumedMinimumCodecOperatingRate;
     buffer = new DecoderInputBuffer(DecoderInputBuffer.BUFFER_REPLACEMENT_MODE_DISABLED);
     flagsOnlyBuffer = DecoderInputBuffer.newFlagsOnlyInstance();
@@ -735,8 +742,14 @@ public abstract class MediaCodecRenderer extends BaseRenderer {
       throws DecoderInitializationException {
     if (availableCodecInfos == null) {
       try {
-        availableCodecInfos =
-            new ArrayDeque<>(getAvailableCodecInfos(mediaCryptoRequiresSecureDecoder));
+        List<MediaCodecInfo> allAvailableCodecInfos =
+            getAvailableCodecInfos(mediaCryptoRequiresSecureDecoder);
+        if (enableDecoderFallback) {
+          availableCodecInfos = new ArrayDeque<>(allAvailableCodecInfos);
+        } else {
+          availableCodecInfos =
+              new ArrayDeque<>(Collections.singletonList(allAvailableCodecInfos.get(0)));
+        }
         preferredDecoderInitializationException = null;
       } catch (DecoderQueryException e) {
         throw new DecoderInitializationException(

library/core/src/main/java/com/google/android/exoplayer2/mediacodec/MediaCodecSelector.java

@@ -18,7 +18,6 @@ package com.google.android.exoplayer2.mediacodec;
 import android.media.MediaCodec;
 import androidx.annotation.Nullable;
 import com.google.android.exoplayer2.mediacodec.MediaCodecUtil.DecoderQueryException;
-import java.util.Collections;
 import java.util.List;
 
 /**
@@ -35,32 +34,6 @@ public interface MediaCodecSelector {
         @Override
         public List<MediaCodecInfo> getDecoderInfos(String mimeType, boolean requiresSecureDecoder)
             throws DecoderQueryException {
-          List<MediaCodecInfo> decoderInfos =
-              MediaCodecUtil.getDecoderInfos(mimeType, requiresSecureDecoder);
-          return decoderInfos.isEmpty()
-              ? Collections.emptyList()
-              : Collections.singletonList(decoderInfos.get(0));
-        }
-
-        @Override
-        public @Nullable MediaCodecInfo getPassthroughDecoderInfo() throws DecoderQueryException {
-          return MediaCodecUtil.getPassthroughDecoderInfo();
-        }
-      };
-
-  /**
-   * A {@link MediaCodecSelector} that returns a list of decoders in priority order, allowing
-   * fallback to less preferred decoders if initialization fails.
-   *
-   * <p>Note: if a hardware-accelerated video decoder fails to initialize, this selector may provide
-   * a software video decoder to use as a fallback. Using software decoding can be inefficient, and
-   * the decoder may be too slow to keep up with the playback position.
-   */
-  MediaCodecSelector DEFAULT_WITH_FALLBACK =
-      new MediaCodecSelector() {
-        @Override
-        public List<MediaCodecInfo> getDecoderInfos(String mimeType, boolean requiresSecureDecoder)
-            throws DecoderQueryException {
           return MediaCodecUtil.getDecoderInfos(mimeType, requiresSecureDecoder);
         }
 

library/core/src/main/java/com/google/android/exoplayer2/video/MediaCodecVideoRenderer.java

@@ -210,16 +210,64 @@ public class MediaCodecVideoRenderer extends MediaCodecRenderer {
    * @param maxDroppedFramesToNotify The maximum number of frames that can be dropped between
    *     invocations of {@link VideoRendererEventListener#onDroppedFrames(int, long)}.
    */
-  public MediaCodecVideoRenderer(Context context, MediaCodecSelector mediaCodecSelector,
+  public MediaCodecVideoRenderer(
+      Context context,
+      MediaCodecSelector mediaCodecSelector,
+      long allowedJoiningTimeMs,
+      @Nullable DrmSessionManager<FrameworkMediaCrypto> drmSessionManager,
+      boolean playClearSamplesWithoutKeys,
+      @Nullable Handler eventHandler,
+      @Nullable VideoRendererEventListener eventListener,
+      int maxDroppedFramesToNotify) {
+    this(
+        context,
+        mediaCodecSelector,
+        allowedJoiningTimeMs,
+        drmSessionManager,
+        playClearSamplesWithoutKeys,
+        /* enableDecoderFallback= */ false,
+        eventHandler,
+        eventListener,
+        maxDroppedFramesToNotify);
+  }
+
+  /**
+   * @param context A context.
+   * @param mediaCodecSelector A decoder selector.
+   * @param allowedJoiningTimeMs The maximum duration in milliseconds for which this video renderer
+   *     can attempt to seamlessly join an ongoing playback.
+   * @param drmSessionManager For use with encrypted content. May be null if support for encrypted
+   *     content is not required.
+   * @param playClearSamplesWithoutKeys Encrypted media may contain clear (un-encrypted) regions.
+   *     For example a media file may start with a short clear region so as to allow playback to
+   *     begin in parallel with key acquisition. This parameter specifies whether the renderer is
+   *     permitted to play clear regions of encrypted media files before {@code drmSessionManager}
+   *     has obtained the keys necessary to decrypt encrypted regions of the media.
+   * @param enableDecoderFallback Whether to enable fallback to lower-priority decoders if decoder
+   *     initialization fails. This may result in using a decoder that is slower/less efficient than
+   *     the primary decoder.
+   * @param eventHandler A handler to use when delivering events to {@code eventListener}. May be
+   *     null if delivery of events is not required.
+   * @param eventListener A listener of events. May be null if delivery of events is not required.
+   * @param maxDroppedFramesToNotify The maximum number of frames that can be dropped between
+   *     invocations of {@link VideoRendererEventListener#onDroppedFrames(int, long)}.
+   */
+  public MediaCodecVideoRenderer(
+      Context context,
+      MediaCodecSelector mediaCodecSelector,
       long allowedJoiningTimeMs,
       @Nullable DrmSessionManager<FrameworkMediaCrypto> drmSessionManager,
-      boolean playClearSamplesWithoutKeys, @Nullable Handler eventHandler,
-      @Nullable VideoRendererEventListener eventListener, int maxDroppedFramesToNotify) {
+      boolean playClearSamplesWithoutKeys,
+      boolean enableDecoderFallback,
+      @Nullable Handler eventHandler,
+      @Nullable VideoRendererEventListener eventListener,
+      int maxDroppedFramesToNotify) {
     super(
         C.TRACK_TYPE_VIDEO,
         mediaCodecSelector,
         drmSessionManager,
         playClearSamplesWithoutKeys,
+        enableDecoderFallback,
         /* assumedMinimumCodecOperatingRate= */ 30);
     this.allowedJoiningTimeMs = allowedJoiningTimeMs;
     this.maxDroppedFramesToNotify = maxDroppedFramesToNotify;