1 files changed, 174 insertions, 0 deletions
diff --git a/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/audio/AudioRendererEventListener.java b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/audio/AudioRendererEventListener.java
new file mode 100644
index 0000000000..bb1ae72855
--- /dev/null
+++ b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/audio/AudioRendererEventListener.java
@@ -0,0 +1,174 @@
+/*
+ * Copyright (C) 2016 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 org.mozilla.thirdparty.com.google.android.exoplayer2.audio;
+
+import static org.mozilla.thirdparty.com.google.android.exoplayer2.util.Util.castNonNull;
+
+import android.os.Handler;
+import android.os.SystemClock;
+import androidx.annotation.Nullable;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.C;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.Format;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.Renderer;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.decoder.DecoderCounters;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.util.Assertions;
+
+/**
+ * Listener of audio {@link Renderer} events. All methods have no-op default implementations to
+ * allow selective overrides.
+ */
+public interface AudioRendererEventListener {
+
+  /**
+   * Called when the renderer is enabled.
+   *
+   * @param counters {@link DecoderCounters} that will be updated by the renderer for as long as it
+   *     remains enabled.
+   */
+  default void onAudioEnabled(DecoderCounters counters) {}
+
+  /**
+   * Called when the audio session is set.
+   *
+   * @param audioSessionId The audio session id.
+   */
+  default void onAudioSessionId(int audioSessionId) {}
+
+  /**
+   * Called when a decoder is created.
+   *
+   * @param decoderName The decoder that was created.
+   * @param initializedTimestampMs {@link SystemClock#elapsedRealtime()} when initialization
+   *     finished.
+   * @param initializationDurationMs The time taken to initialize the decoder in milliseconds.
+   */
+  default void onAudioDecoderInitialized(
+      String decoderName, long initializedTimestampMs, long initializationDurationMs) {}
+
+  /**
+   * Called when the format of the media being consumed by the renderer changes.
+   *
+   * @param format The new format.
+   */
+  default void onAudioInputFormatChanged(Format format) {}
+
+  /**
+   * Called when an {@link AudioSink} underrun occurs.
+   *
+   * @param bufferSize The size of the {@link AudioSink}'s buffer, in bytes.
+   * @param bufferSizeMs The size of the {@link AudioSink}'s buffer, in milliseconds, if it is
+   *     configured for PCM output. {@link C#TIME_UNSET} if it is configured for passthrough output,
+   *     as the buffered media can have a variable bitrate so the duration may be unknown.
+   * @param elapsedSinceLastFeedMs The time since the {@link AudioSink} was last fed data.
+   */
+  default void onAudioSinkUnderrun(
+      int bufferSize, long bufferSizeMs, long elapsedSinceLastFeedMs) {}
+
+  /**
+   * Called when the renderer is disabled.
+   *
+   * @param counters {@link DecoderCounters} that were updated by the renderer.
+   */
+  default void onAudioDisabled(DecoderCounters counters) {}
+
+  /**
+   * Dispatches events to a {@link AudioRendererEventListener}.
+   */
+  final class EventDispatcher {
+
+    @Nullable private final Handler handler;
+    @Nullable private final AudioRendererEventListener listener;
+
+    /**
+     * @param handler A handler for dispatching events, or null if creating a dummy instance.
+     * @param listener The listener to which events should be dispatched, or null if creating a
+     *     dummy instance.
+     */
+    public EventDispatcher(@Nullable Handler handler,
+        @Nullable AudioRendererEventListener listener) {
+      this.handler = listener != null ? Assertions.checkNotNull(handler) : null;
+      this.listener = listener;
+    }
+
+    /**
+     * Invokes {@link AudioRendererEventListener#onAudioEnabled(DecoderCounters)}.
+     */
+    public void enabled(final DecoderCounters decoderCounters) {
+      if (handler != null) {
+        handler.post(() -> castNonNull(listener).onAudioEnabled(decoderCounters));
+      }
+    }
+
+    /**
+     * Invokes {@link AudioRendererEventListener#onAudioDecoderInitialized(String, long, long)}.
+     */
+    public void decoderInitialized(final String decoderName,
+        final long initializedTimestampMs, final long initializationDurationMs) {
+      if (handler != null) {
+        handler.post(
+            () ->
+                castNonNull(listener)
+                    .onAudioDecoderInitialized(
+                        decoderName, initializedTimestampMs, initializationDurationMs));
+      }
+    }
+
+    /**
+     * Invokes {@link AudioRendererEventListener#onAudioInputFormatChanged(Format)}.
+     */
+    public void inputFormatChanged(final Format format) {
+      if (handler != null) {
+        handler.post(() -> castNonNull(listener).onAudioInputFormatChanged(format));
+      }
+    }
+
+    /**
+     * Invokes {@link AudioRendererEventListener#onAudioSinkUnderrun(int, long, long)}.
+     */
+    public void audioTrackUnderrun(final int bufferSize, final long bufferSizeMs,
+        final long elapsedSinceLastFeedMs) {
+      if (handler != null) {
+        handler.post(
+            () ->
+                castNonNull(listener)
+                    .onAudioSinkUnderrun(bufferSize, bufferSizeMs, elapsedSinceLastFeedMs));
+      }
+    }
+
+    /**
+     * Invokes {@link AudioRendererEventListener#onAudioDisabled(DecoderCounters)}.
+     */
+    public void disabled(final DecoderCounters counters) {
+      counters.ensureUpdated();
+      if (handler != null) {
+        handler.post(
+            () -> {
+              counters.ensureUpdated();
+              castNonNull(listener).onAudioDisabled(counters);
+            });
+      }
+    }
+
+    /**
+     * Invokes {@link AudioRendererEventListener#onAudioSessionId(int)}.
+     */
+    public void audioSessionId(final int audioSessionId) {
+      if (handler != null) {
+        handler.post(() -> castNonNull(listener).onAudioSessionId(audioSessionId));
+      }
+    }
+  }
+}