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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.ts;
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.extractor.ExtractorOutput;
import org.mozilla.thirdparty.com.google.android.exoplayer2.extractor.TrackOutput;
import org.mozilla.thirdparty.com.google.android.exoplayer2.extractor.ts.TsPayloadReader.TrackIdGenerator;
import org.mozilla.thirdparty.com.google.android.exoplayer2.text.cea.CeaUtil;
import org.mozilla.thirdparty.com.google.android.exoplayer2.util.Assertions;
import org.mozilla.thirdparty.com.google.android.exoplayer2.util.MimeTypes;
import org.mozilla.thirdparty.com.google.android.exoplayer2.util.ParsableByteArray;
import java.util.List;
/** Consumes SEI buffers, outputting contained CEA-608 messages to a {@link TrackOutput}. */
public final class SeiReader {
private final List<Format> closedCaptionFormats;
private final TrackOutput[] outputs;
/**
* @param closedCaptionFormats A list of formats for the closed caption channels to expose.
*/
public SeiReader(List<Format> closedCaptionFormats) {
this.closedCaptionFormats = closedCaptionFormats;
outputs = new TrackOutput[closedCaptionFormats.size()];
}
public void createTracks(ExtractorOutput extractorOutput, TrackIdGenerator idGenerator) {
for (int i = 0; i < outputs.length; i++) {
idGenerator.generateNewId();
TrackOutput output = extractorOutput.track(idGenerator.getTrackId(), C.TRACK_TYPE_TEXT);
Format channelFormat = closedCaptionFormats.get(i);
String channelMimeType = channelFormat.sampleMimeType;
Assertions.checkArgument(MimeTypes.APPLICATION_CEA608.equals(channelMimeType)
|| MimeTypes.APPLICATION_CEA708.equals(channelMimeType),
"Invalid closed caption mime type provided: " + channelMimeType);
String formatId = channelFormat.id != null ? channelFormat.id : idGenerator.getFormatId();
output.format(
Format.createTextSampleFormat(
formatId,
channelMimeType,
/* codecs= */ null,
/* bitrate= */ Format.NO_VALUE,
channelFormat.selectionFlags,
channelFormat.language,
channelFormat.accessibilityChannel,
/* drmInitData= */ null,
Format.OFFSET_SAMPLE_RELATIVE,
channelFormat.initializationData));
outputs[i] = output;
}
}
public void consume(long pesTimeUs, ParsableByteArray seiBuffer) {
CeaUtil.consume(pesTimeUs, seiBuffer, outputs);
}
}
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