Move DefaultAudioSink.AudioProcessorChain to AudioProcessorChain

Split inner interface into separate file, which will go in common
module. The old interface will be deprecated and extends the new.

#cleanup

PiperOrigin-RevId: 483732226

library/common/src/main/java/androidx/media3/common/audio/AudioProcessorChain.java

@@ -0,0 +1,72 @@
+/*
+ * Copyright 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package androidx.media3.common.audio;
+
+import com.google.android.exoplayer2.PlaybackParameters;
+
+/**
+ * Provides a chain of audio processors, which are used for any user-defined processing and applying
+ * playback parameters (if supported). Because applying playback parameters can skip and
+ * stretch/compress audio, the sink will query the chain for information on how to transform its
+ * output position to map it onto a media position, via {@link #getMediaDuration(long)} and {@link
+ * #getSkippedOutputFrameCount()}.
+ */
+public interface AudioProcessorChain {
+
+  /**
+   * Returns the fixed chain of audio processors that will process audio. This method is called once
+   * during initialization, but audio processors may change state to become active/inactive during
+   * playback.
+   */
+  AudioProcessor[] getAudioProcessors();
+
+  /**
+   * Configures audio processors to apply the specified playback parameters immediately, returning
+   * the new playback parameters, which may differ from those passed in. Only called when processors
+   * have no input pending.
+   *
+   * @param playbackParameters The playback parameters to try to apply.
+   * @return The playback parameters that were actually applied.
+   */
+  PlaybackParameters applyPlaybackParameters(PlaybackParameters playbackParameters);
+
+  /**
+   * Configures audio processors to apply whether to skip silences immediately, returning the new
+   * value. Only called when processors have no input pending.
+   *
+   * @param skipSilenceEnabled Whether silences should be skipped in the audio stream.
+   * @return The new value.
+   */
+  boolean applySkipSilenceEnabled(boolean skipSilenceEnabled);
+
+  /**
+   * Returns the media duration corresponding to the specified playout duration, taking speed
+   * adjustment due to audio processing into account.
+   *
+   * <p>The scaling performed by this method will use the actual playback speed achieved by the
+   * audio processor chain, on average, since it was last flushed. This may differ very slightly
+   * from the target playback speed.
+   *
+   * @param playoutDuration The playout duration to scale.
+   * @return The corresponding media duration, in the same units as {@code duration}.
+   */
+  long getMediaDuration(long playoutDuration);
+
+  /**
+   * Returns the number of output audio frames skipped since the audio processors were last flushed.
+   */
+  long getSkippedOutputFrameCount();
+}

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

@@ -99,64 +99,16 @@ private InvalidAudioTrackTimestampException(String message) {
   }
 
   /**
-   * Provides a chain of audio processors, which are used for any user-defined processing and
-   * applying playback parameters (if supported). Because applying playback parameters can skip and
-   * stretch/compress audio, the sink will query the chain for information on how to transform its
-   * output position to map it onto a media position, via {@link #getMediaDuration(long)} and {@link
-   * #getSkippedOutputFrameCount()}.
+   * @deprecated Use {@link androidx.media3.common.audio.AudioProcessorChain}.
    */
-  public interface AudioProcessorChain {
-
-    /**
-     * Returns the fixed chain of audio processors that will process audio. This method is called
-     * once during initialization, but audio processors may change state to become active/inactive
-     * during playback.
-     */
-    AudioProcessor[] getAudioProcessors();
-
-    /**
-     * Configures audio processors to apply the specified playback parameters immediately, returning
-     * the new playback parameters, which may differ from those passed in. Only called when
-     * processors have no input pending.
-     *
-     * @param playbackParameters The playback parameters to try to apply.
-     * @return The playback parameters that were actually applied.
-     */
-    PlaybackParameters applyPlaybackParameters(PlaybackParameters playbackParameters);
-
-    /**
-     * Configures audio processors to apply whether to skip silences immediately, returning the new
-     * value. Only called when processors have no input pending.
-     *
-     * @param skipSilenceEnabled Whether silences should be skipped in the audio stream.
-     * @return The new value.
-     */
-    boolean applySkipSilenceEnabled(boolean skipSilenceEnabled);
-
-    /**
-     * Returns the media duration corresponding to the specified playout duration, taking speed
-     * adjustment due to audio processing into account.
-     *
-     * <p>The scaling performed by this method will use the actual playback speed achieved by the
-     * audio processor chain, on average, since it was last flushed. This may differ very slightly
-     * from the target playback speed.
-     *
-     * @param playoutDuration The playout duration to scale.
-     * @return The corresponding media duration, in the same units as {@code duration}.
-     */
-    long getMediaDuration(long playoutDuration);
-
-    /**
-     * Returns the number of output audio frames skipped since the audio processors were last
-     * flushed.
-     */
-    long getSkippedOutputFrameCount();
-  }
+  @Deprecated
+  public interface AudioProcessorChain extends androidx.media3.common.audio.AudioProcessorChain {}
 
   /**
    * The default audio processor chain, which applies a (possibly empty) chain of user-defined audio
    * processors followed by {@link SilenceSkippingAudioProcessor} and {@link SonicAudioProcessor}.
    */
+  @SuppressWarnings("deprecation")
   public static class DefaultAudioProcessorChain implements AudioProcessorChain {
 
     private final AudioProcessor[] audioProcessors;
@@ -260,7 +212,7 @@ int getBufferSizeInBytes(
   public static final class Builder {
 
     private AudioCapabilities audioCapabilities;
-    @Nullable private AudioProcessorChain audioProcessorChain;
+    @Nullable private androidx.media3.common.audio.AudioProcessorChain audioProcessorChain;
     private boolean enableFloatOutput;
     private boolean enableAudioTrackPlaybackParams;
     private int offloadMode;
@@ -301,14 +253,15 @@ public Builder setAudioProcessors(AudioProcessor[] audioProcessors) {
     }
 
     /**
-     * Sets the {@link AudioProcessorChain} to process audio before playback. The instance passed in
-     * must not be reused in other sinks. Processing chains are only supported for PCM playback (not
-     * passthrough or offload).
+     * Sets the {@link androidx.media3.common.audio.AudioProcessorChain} to process audio before
+     * playback. The instance passed in must not be reused in other sinks. Processing chains are
+     * only supported for PCM playback (not passthrough or offload).
      *
      * <p>By default, no processing will be applied.
      */
     @CanIgnoreReturnValue
-    public Builder setAudioProcessorChain(AudioProcessorChain audioProcessorChain) {
+    public Builder setAudioProcessorChain(
+        androidx.media3.common.audio.AudioProcessorChain audioProcessorChain) {
       checkNotNull(audioProcessorChain);
       this.audioProcessorChain = audioProcessorChain;
       return this;
@@ -498,7 +451,7 @@ public DefaultAudioSink build() {
   private static int pendingReleaseCount;
 
   private final AudioCapabilities audioCapabilities;
-  private final AudioProcessorChain audioProcessorChain;
+  private final androidx.media3.common.audio.AudioProcessorChain audioProcessorChain;
   private final boolean enableFloatOutput;
   private final ChannelMappingAudioProcessor channelMappingAudioProcessor;
   private final TrimmingAudioProcessor trimmingAudioProcessor;

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

@@ -18,6 +18,7 @@
 import static java.lang.Math.min;
 
 import androidx.annotation.Nullable;
+import androidx.media3.common.audio.AudioProcessorChain;
 import com.google.android.exoplayer2.C;
 import com.google.android.exoplayer2.util.Assertions;
 import com.google.android.exoplayer2.util.Log;
@@ -34,8 +35,8 @@
  * <p>This audio processor can be inserted into the audio processor chain to access audio data
  * before/after particular processing steps have been applied. For example, to get audio output
  * after playback speed adjustment and silence skipping have been applied it is necessary to pass a
- * custom {@link DefaultAudioSink.AudioProcessorChain} when creating the audio sink, and include
- * this audio processor after all other audio processors.
+ * custom {@link AudioProcessorChain} when creating the audio sink, and include this audio processor
+ * after all other audio processors.
  */
 public final class TeeAudioProcessor extends BaseAudioProcessor {