1 files changed, 111 insertions, 0 deletions
diff --git a/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/source/chunk/ChunkSource.java b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/source/chunk/ChunkSource.java
new file mode 100644
index 0000000000..33cee8e20e
--- /dev/null
+++ b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/source/chunk/ChunkSource.java
@@ -0,0 +1,111 @@
+/*
+ * 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.source.chunk;
+
+import org.mozilla.thirdparty.com.google.android.exoplayer2.C;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.SeekParameters;
+import java.io.IOException;
+import java.util.List;
+
+/**
+ * A provider of {@link Chunk}s for a {@link ChunkSampleStream} to load.
+ */
+public interface ChunkSource {
+
+  /**
+   * Adjusts a seek position given the specified {@link SeekParameters}. Chunk boundaries are used
+   * as sync points.
+   *
+   * @param positionUs The seek position in microseconds.
+   * @param seekParameters Parameters that control how the seek is performed.
+   * @return The adjusted seek position, in microseconds.
+   */
+  long getAdjustedSeekPositionUs(long positionUs, SeekParameters seekParameters);
+
+  /**
+   * If the source is currently having difficulty providing chunks, then this method throws the
+   * underlying error. Otherwise does nothing.
+   * <p>
+   * This method should only be called after the source has been prepared.
+   *
+   * @throws IOException The underlying error.
+   */
+  void maybeThrowError() throws IOException;
+
+  /**
+   * Evaluates whether {@link MediaChunk}s should be removed from the back of the queue.
+   * <p>
+   * Removing {@link MediaChunk}s from the back of the queue can be useful if they could be replaced
+   * with chunks of a significantly higher quality (e.g. because the available bandwidth has
+   * substantially increased).
+   *
+   * @param playbackPositionUs The current playback position.
+   * @param queue The queue of buffered {@link MediaChunk}s.
+   * @return The preferred queue size.
+   */
+  int getPreferredQueueSize(long playbackPositionUs, List<? extends MediaChunk> queue);
+
+  /**
+   * Returns the next chunk to load.
+   *
+   * <p>If a chunk is available then {@link ChunkHolder#chunk} is set. If the end of the stream has
+   * been reached then {@link ChunkHolder#endOfStream} is set. If a chunk is not available but the
+   * end of the stream has not been reached, the {@link ChunkHolder} is not modified.
+   *
+   * @param playbackPositionUs The current playback position in microseconds. If playback of the
+   *     period to which this chunk source belongs has not yet started, the value will be the
+   *     starting position in the period minus the duration of any media in previous periods still
+   *     to be played.
+   * @param loadPositionUs The current load position in microseconds. If {@code queue} is empty,
+   *     this is the starting position from which chunks should be provided. Else it's equal to
+   *     {@link MediaChunk#endTimeUs} of the last chunk in the {@code queue}.
+   * @param queue The queue of buffered {@link MediaChunk}s.
+   * @param out A holder to populate.
+   */
+  void getNextChunk(
+      long playbackPositionUs,
+      long loadPositionUs,
+      List<? extends MediaChunk> queue,
+      ChunkHolder out);
+
+  /**
+   * Called when the {@link ChunkSampleStream} has finished loading a chunk obtained from this
+   * source.
+   *
+   * <p>This method should only be called when the source is enabled.
+   *
+   * @param chunk The chunk whose load has been completed.
+   */
+  void onChunkLoadCompleted(Chunk chunk);
+
+  /**
+   * Called when the {@link ChunkSampleStream} encounters an error loading a chunk obtained from
+   * this source.
+   *
+   * <p>This method should only be called when the source is enabled.
+   *
+   * @param chunk The chunk whose load encountered the error.
+   * @param cancelable Whether the load can be canceled.
+   * @param e The error.
+   * @param blacklistDurationMs The duration for which the associated track may be blacklisted, or
+   *     {@link C#TIME_UNSET} if the track may not be blacklisted.
+   * @return Whether the load should be canceled so that a replacement chunk can be loaded instead.
+   *     Must be {@code false} if {@code cancelable} is {@code false}. If {@code true}, {@link
+   *     #getNextChunk(long, long, List, ChunkHolder)} will be called to obtain the replacement
+   *     chunk.
+   */
+  boolean onChunkLoadError(Chunk chunk, boolean cancelable, Exception e, long blacklistDurationMs);
+}