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/*
* 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;
}
}
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