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.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 BaseMediaChunk} that uses an {@link Extractor} to decode sample data.
   */
  public class ContainerMediaChunk extends BaseMediaChunk {
  
    private final int chunkCount;
    private final long sampleOffsetUs;
    private final ChunkExtractorWrapper extractorWrapper;
  
    private volatile int bytesLoaded;
    private volatile boolean loadCanceled;
    private volatile boolean loadCompleted;
  
    /**
     * @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 startTimeUs The start time of the media contained by the chunk, in microseconds.
     * @param endTimeUs The end time of the media contained by the chunk, in microseconds.
     * @param chunkIndex The index of the chunk.
     * @param chunkCount The number of chunks in the underlying media that are spanned by this
     *     instance. Normally equal to one, but may be larger if multiple chunks as defined by the
     *     underlying media are being merged into a single load.
     * @param sampleOffsetUs An offset to add to the sample timestamps parsed by the extractor.
     * @param extractorWrapper A wrapped extractor to use for parsing the data.
     */
    public ContainerMediaChunk(
        DataSource dataSource,
        DataSpec dataSpec,
        Format trackFormat,
        int trackSelectionReason,
        Object trackSelectionData,
        long startTimeUs,
        long endTimeUs,
        long chunkIndex,
        int chunkCount,
        long sampleOffsetUs,
        ChunkExtractorWrapper extractorWrapper) {
      super(dataSource, dataSpec, trackFormat, trackSelectionReason, trackSelectionData, startTimeUs,
          endTimeUs, chunkIndex);
      this.chunkCount = chunkCount;
      this.sampleOffsetUs = sampleOffsetUs;
      this.extractorWrapper = extractorWrapper;
    }
  
    @Override
    public long getNextChunkIndex() {
      return chunkIndex + chunkCount;
    }
  
    @Override
    public boolean isLoadCompleted() {
      return loadCompleted;
    }
  
    @Override
    public final long bytesLoaded() {
      return bytesLoaded;
    }
  
    // Loadable implementation.
  
    @Override
    public final void cancelLoad() {
      loadCanceled = true;
    }
  
    @Override
    public final boolean isLoadCanceled() {
      return loadCanceled;
    }
  
    @SuppressWarnings("NonAtomicVolatileUpdate")
    @Override
    public final 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) {
          // Configure the output and set it as the target for the extractor wrapper.
          BaseMediaChunkOutput output = getOutput();
          output.setSampleOffsetUs(sampleOffsetUs);
          extractorWrapper.init(output);
        }
        // Load and decode the sample 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);
      }
      loadCompleted = true;
    }
  
  }
  