diff options
Diffstat (limited to 'mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/extractor/rawcc/RawCcExtractor.java')
-rw-r--r-- | mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/extractor/rawcc/RawCcExtractor.java | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/extractor/rawcc/RawCcExtractor.java b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/extractor/rawcc/RawCcExtractor.java new file mode 100644 index 0000000000..a7b32782ff --- /dev/null +++ b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/extractor/rawcc/RawCcExtractor.java @@ -0,0 +1,170 @@ +/* + * 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.rawcc; + +import org.mozilla.thirdparty.com.google.android.exoplayer2.C; +import org.mozilla.thirdparty.com.google.android.exoplayer2.Format; +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.PositionHolder; +import org.mozilla.thirdparty.com.google.android.exoplayer2.extractor.SeekMap; +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 RawCC container format. + */ +public final class RawCcExtractor implements Extractor { + + private static final int SCRATCH_SIZE = 9; + private static final int HEADER_SIZE = 8; + private static final int HEADER_ID = 0x52434301; + private static final int TIMESTAMP_SIZE_V0 = 4; + private static final int TIMESTAMP_SIZE_V1 = 8; + + // Parser states. + private static final int STATE_READING_HEADER = 0; + private static final int STATE_READING_TIMESTAMP_AND_COUNT = 1; + private static final int STATE_READING_SAMPLES = 2; + + private final Format format; + + private final ParsableByteArray dataScratch; + + private TrackOutput trackOutput; + + private int parserState; + private int version; + private long timestampUs; + private int remainingSampleCount; + private int sampleBytesWritten; + + public RawCcExtractor(Format format) { + this.format = format; + dataScratch = new ParsableByteArray(SCRATCH_SIZE); + parserState = STATE_READING_HEADER; + } + + @Override + public void init(ExtractorOutput output) { + output.seekMap(new SeekMap.Unseekable(C.TIME_UNSET)); + trackOutput = output.track(0, C.TRACK_TYPE_TEXT); + output.endTracks(); + trackOutput.format(format); + } + + @Override + public boolean sniff(ExtractorInput input) throws IOException, InterruptedException { + dataScratch.reset(); + input.peekFully(dataScratch.data, 0, HEADER_SIZE); + return dataScratch.readInt() == HEADER_ID; + } + + @Override + public int read(ExtractorInput input, PositionHolder seekPosition) + throws IOException, InterruptedException { + while (true) { + switch (parserState) { + case STATE_READING_HEADER: + if (parseHeader(input)) { + parserState = STATE_READING_TIMESTAMP_AND_COUNT; + } else { + return RESULT_END_OF_INPUT; + } + break; + case STATE_READING_TIMESTAMP_AND_COUNT: + if (parseTimestampAndSampleCount(input)) { + parserState = STATE_READING_SAMPLES; + } else { + parserState = STATE_READING_HEADER; + return RESULT_END_OF_INPUT; + } + break; + case STATE_READING_SAMPLES: + parseSamples(input); + parserState = STATE_READING_TIMESTAMP_AND_COUNT; + return RESULT_CONTINUE; + default: + throw new IllegalStateException(); + } + } + } + + @Override + public void seek(long position, long timeUs) { + parserState = STATE_READING_HEADER; + } + + @Override + public void release() { + // Do nothing + } + + private boolean parseHeader(ExtractorInput input) throws IOException, InterruptedException { + dataScratch.reset(); + if (input.readFully(dataScratch.data, 0, HEADER_SIZE, true)) { + if (dataScratch.readInt() != HEADER_ID) { + throw new IOException("Input not RawCC"); + } + version = dataScratch.readUnsignedByte(); + // no versions use the flag fields yet + return true; + } else { + return false; + } + } + + private boolean parseTimestampAndSampleCount(ExtractorInput input) throws IOException, + InterruptedException { + dataScratch.reset(); + if (version == 0) { + if (!input.readFully(dataScratch.data, 0, TIMESTAMP_SIZE_V0 + 1, true)) { + return false; + } + // version 0 timestamps are 45kHz, so we need to convert them into us + timestampUs = dataScratch.readUnsignedInt() * 1000 / 45; + } else if (version == 1) { + if (!input.readFully(dataScratch.data, 0, TIMESTAMP_SIZE_V1 + 1, true)) { + return false; + } + timestampUs = dataScratch.readLong(); + } else { + throw new ParserException("Unsupported version number: " + version); + } + + remainingSampleCount = dataScratch.readUnsignedByte(); + sampleBytesWritten = 0; + return true; + } + + private void parseSamples(ExtractorInput input) throws IOException, InterruptedException { + for (; remainingSampleCount > 0; remainingSampleCount--) { + dataScratch.reset(); + input.readFully(dataScratch.data, 0, 3); + + trackOutput.sampleData(dataScratch, 3); + sampleBytesWritten += 3; + } + + if (sampleBytesWritten > 0) { + trackOutput.sampleMetadata(timestampUs, C.BUFFER_FLAG_KEY_FRAME, sampleBytesWritten, 0, null); + } + } + +} |