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.source.chunk;
  
  import com.google.android.exoplayer2.C;
  import com.google.android.exoplayer2.Format;
  import com.google.android.exoplayer2.extractor.DefaultExtractorInput;
  import com.google.android.exoplayer2.extractor.Extractor;
  import com.google.android.exoplayer2.extractor.ExtractorInput;
  import com.google.android.exoplayer2.upstream.DataSource;
  import com.google.android.exoplayer2.upstream.DataSpec;
  import com.google.android.exoplayer2.util.Assertions;
  import com.google.android.exoplayer2.util.Util;
  import java.io.IOException;
  
  /**
   * A {@link Chunk} that uses an {@link Extractor} to decode initialization data for single track.
   */
  public final class InitializationChunk extends Chunk {
  
    private final ChunkExtractorWrapper extractorWrapper;
  
    private volatile int bytesLoaded;
    private volatile boolean loadCanceled;
  
    /**
     * @param dataSource The source from which the data should be loaded.
     * @param dataSpec Defines the data to be loaded.
     * @param trackFormat See {@link #trackFormat}.
     * @param trackSelectionReason See {@link #trackSelectionReason}.
     * @param trackSelectionData See {@link #trackSelectionData}.
     * @param extractorWrapper A wrapped extractor to use for parsing the initialization data.
     */
    public InitializationChunk(DataSource dataSource, DataSpec dataSpec, Format trackFormat,
        int trackSelectionReason, Object trackSelectionData,
        ChunkExtractorWrapper extractorWrapper) {
      super(dataSource, dataSpec, C.DATA_TYPE_MEDIA_INITIALIZATION, trackFormat, trackSelectionReason,
          trackSelectionData, C.TIME_UNSET, C.TIME_UNSET);
      this.extractorWrapper = extractorWrapper;
    }
  
    @Override
    public long bytesLoaded() {
      return bytesLoaded;
    }
  
    // Loadable implementation.
  
    @Override
    public void cancelLoad() {
      loadCanceled = true;
    }
  
    @Override
    public boolean isLoadCanceled() {
      return loadCanceled;
    }
  
    @SuppressWarnings("NonAtomicVolatileUpdate")
    @Override
    public void load() throws IOException, InterruptedException {
      DataSpec loadDataSpec = dataSpec.subrange(bytesLoaded);
      try {
        // Create and open the input.
        ExtractorInput input = new DefaultExtractorInput(dataSource,
            loadDataSpec.absoluteStreamPosition, dataSource.open(loadDataSpec));
        if (bytesLoaded == 0) {
          extractorWrapper.init(null);
        }
        // Load and decode the initialization data.
        try {
          Extractor extractor = extractorWrapper.extractor;
          int result = Extractor.RESULT_CONTINUE;
          while (result == Extractor.RESULT_CONTINUE && !loadCanceled) {
            result = extractor.read(input, null);
          }
          Assertions.checkState(result != Extractor.RESULT_SEEK);
        } finally {
          bytesLoaded = (int) (input.getPosition() - dataSpec.absoluteStreamPosition);
        }
      } finally {
        Util.closeQuietly(dataSource);
      }
    }
  
  }
  