1 files changed, 114 insertions, 0 deletions
diff --git a/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/extractor/ogg/OggExtractor.java b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/extractor/ogg/OggExtractor.java
new file mode 100644
index 0000000000..da53a47dc0
--- /dev/null
+++ b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/extractor/ogg/OggExtractor.java
@@ -0,0 +1,114 @@
+/*
+ * 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.extractor.ogg;
+
+import org.mozilla.thirdparty.com.google.android.exoplayer2.C;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.ParserException;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.extractor.Extractor;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.extractor.ExtractorInput;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.extractor.ExtractorOutput;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.extractor.ExtractorsFactory;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.extractor.PositionHolder;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.extractor.TrackOutput;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.util.ParsableByteArray;
+import java.io.IOException;
+
+/**
+ * Extracts data from the Ogg container format.
+ */
+public class OggExtractor implements Extractor {
+
+  /** Factory for {@link OggExtractor} instances. */
+  public static final ExtractorsFactory FACTORY = () -> new Extractor[] {new OggExtractor()};
+
+  private static final int MAX_VERIFICATION_BYTES = 8;
+
+  private ExtractorOutput output;
+  private StreamReader streamReader;
+  private boolean streamReaderInitialized;
+
+  @Override
+  public boolean sniff(ExtractorInput input) throws IOException, InterruptedException {
+    try {
+      return sniffInternal(input);
+    } catch (ParserException e) {
+      return false;
+    }
+  }
+
+  @Override
+  public void init(ExtractorOutput output) {
+    this.output = output;
+  }
+
+  @Override
+  public void seek(long position, long timeUs) {
+    if (streamReader != null) {
+      streamReader.seek(position, timeUs);
+    }
+  }
+
+  @Override
+  public void release() {
+    // Do nothing
+  }
+
+  @Override
+  public int read(ExtractorInput input, PositionHolder seekPosition)
+      throws IOException, InterruptedException {
+    if (streamReader == null) {
+      if (!sniffInternal(input)) {
+        throw new ParserException("Failed to determine bitstream type");
+      }
+      input.resetPeekPosition();
+    }
+    if (!streamReaderInitialized) {
+      TrackOutput trackOutput = output.track(0, C.TRACK_TYPE_AUDIO);
+      output.endTracks();
+      streamReader.init(output, trackOutput);
+      streamReaderInitialized = true;
+    }
+    return streamReader.read(input, seekPosition);
+  }
+
+  private boolean sniffInternal(ExtractorInput input) throws IOException, InterruptedException {
+    OggPageHeader header = new OggPageHeader();
+    if (!header.populate(input, true) || (header.type & 0x02) != 0x02) {
+      return false;
+    }
+
+    int length = Math.min(header.bodySize, MAX_VERIFICATION_BYTES);
+    ParsableByteArray scratch = new ParsableByteArray(length);
+    input.peekFully(scratch.data, 0, length);
+
+    if (FlacReader.verifyBitstreamType(resetPosition(scratch))) {
+      streamReader = new FlacReader();
+    } else if (VorbisReader.verifyBitstreamType(resetPosition(scratch))) {
+      streamReader = new VorbisReader();
+    } else if (OpusReader.verifyBitstreamType(resetPosition(scratch))) {
+      streamReader = new OpusReader();
+    } else {
+      return false;
+    }
+    return true;
+  }
+
+  private static ParsableByteArray resetPosition(ParsableByteArray scratch) {
+    scratch.setPosition(0);
+    return scratch;
+  }
+
+}