1 files changed, 60 insertions, 0 deletions
diff --git a/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/extractor/mp3/Seeker.java b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/extractor/mp3/Seeker.java
new file mode 100644
index 0000000000..da0306cc60
--- /dev/null
+++ b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/extractor/mp3/Seeker.java
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2019 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.extractor.mp3;
+
+import org.mozilla.thirdparty.com.google.android.exoplayer2.C;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.extractor.SeekMap;
+
+/**
+ * {@link SeekMap} that provides the end position of audio data and also allows mapping from
+ * position (byte offset) back to time, which can be used to work out the new sample basis timestamp
+ * after seeking and resynchronization.
+ */
+/* package */ interface Seeker extends SeekMap {
+
+  /**
+   * Maps a position (byte offset) to a corresponding sample timestamp.
+   *
+   * @param position A seek position (byte offset) relative to the start of the stream.
+   * @return The corresponding timestamp of the next sample to be read, in microseconds.
+   */
+  long getTimeUs(long position);
+
+  /**
+   * Returns the position (byte offset) in the stream that is immediately after audio data, or
+   * {@link C#POSITION_UNSET} if not known.
+   */
+  long getDataEndPosition();
+
+  /** A {@link Seeker} that does not support seeking through audio data. */
+  /* package */ class UnseekableSeeker extends SeekMap.Unseekable implements Seeker {
+
+    public UnseekableSeeker() {
+      super(/* durationUs= */ C.TIME_UNSET);
+    }
+
+    @Override
+    public long getTimeUs(long position) {
+      return 0;
+    }
+
+    @Override
+    public long getDataEndPosition() {
+      // Position unset as we do not know the data end position. Note that returning 0 doesn't work.
+      return C.POSITION_UNSET;
+    }
+  }
+}