1 files changed, 77 insertions, 0 deletions
diff --git a/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/source/SequenceableLoader.java b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/source/SequenceableLoader.java
new file mode 100644
index 0000000000..09cb8b663b
--- /dev/null
+++ b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/source/SequenceableLoader.java
@@ -0,0 +1,77 @@
+/*
+ * 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;
+
+import org.mozilla.thirdparty.com.google.android.exoplayer2.C;
+
+// TODO: Clarify the requirements for implementing this interface [Internal ref: b/36250203].
+/**
+ * A loader that can proceed in approximate synchronization with other loaders.
+ */
+public interface SequenceableLoader {
+
+  /**
+   * A callback to be notified of {@link SequenceableLoader} events.
+   */
+  interface Callback<T extends SequenceableLoader> {
+
+    /**
+     * Called by the loader to indicate that it wishes for its {@link #continueLoading(long)} method
+     * to be called when it can continue to load data. Called on the playback thread.
+     */
+    void onContinueLoadingRequested(T source);
+
+  }
+
+  /**
+   * Returns an estimate of the position up to which data is buffered.
+   *
+   * @return An estimate of the absolute position in microseconds up to which data is buffered, or
+   *     {@link C#TIME_END_OF_SOURCE} if the data is fully buffered.
+   */
+  long getBufferedPositionUs();
+
+  /**
+   * Returns the next load time, or {@link C#TIME_END_OF_SOURCE} if loading has finished.
+   */
+  long getNextLoadPositionUs();
+
+  /**
+   * Attempts to continue loading.
+   *
+   * @param positionUs The current playback position in microseconds. If playback of the period to
+   *     which this loader 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.
+   * @return True if progress was made, meaning that {@link #getNextLoadPositionUs()} will return
+   *     a different value than prior to the call. False otherwise.
+   */
+  boolean continueLoading(long positionUs);
+
+  /** Returns whether the loader is currently loading. */
+  boolean isLoading();
+
+  /**
+   * Re-evaluates the buffer given the playback position.
+   *
+   * <p>Re-evaluation may discard buffered media so that it can be re-buffered in a different
+   * quality.
+   *
+   * @param positionUs The current playback position in microseconds. If playback of this period has
+   *     not yet started, the value will be the starting position in this period minus the duration
+   *     of any media in previous periods still to be played.
+   */
+  void reevaluateBuffer(long positionUs);
+}