content: /*
   * 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 com.google.android.exoplayer2.extractor.ts;
  
  import com.google.android.exoplayer2.C;
  import com.google.android.exoplayer2.Format;
  import com.google.android.exoplayer2.extractor.ExtractorOutput;
  import com.google.android.exoplayer2.extractor.TrackOutput;
  import com.google.android.exoplayer2.extractor.ts.TsPayloadReader.TrackIdGenerator;
  import com.google.android.exoplayer2.text.cea.CeaUtil;
  import com.google.android.exoplayer2.util.Assertions;
  import com.google.android.exoplayer2.util.MimeTypes;
  import com.google.android.exoplayer2.util.ParsableByteArray;
  import java.util.List;
  
  /**
   * Consumes SEI buffers, outputting contained CEA-608 messages to a {@link TrackOutput}.
   */
  /* package */ 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, null, Format.NO_VALUE,
            channelFormat.selectionFlags, channelFormat.language, channelFormat.accessibilityChannel,
            null));
        outputs[i] = output;
      }
    }
  
    public void consume(long pesTimeUs, ParsableByteArray seiBuffer) {
      CeaUtil.consume(pesTimeUs, seiBuffer, outputs);
    }
  
  }
  