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 androidx.annotation.Nullable;
  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.source.chunk.ChunkExtractor.TrackOutputProvider;
  import com.google.android.exoplayer2.upstream.DataSource;
  import com.google.android.exoplayer2.upstream.DataSourceUtil;
  import com.google.android.exoplayer2.upstream.DataSpec;
  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 ChunkExtractor chunkExtractor;
  
    private long nextLoadPosition;
    private volatile boolean loadCanceled;
    private 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 clippedStartTimeUs The time in the chunk from which output will begin, or {@link
     *     C#TIME_UNSET} to output from the start of the chunk.
     * @param clippedEndTimeUs The time in the chunk from which output will end, or {@link
     *     C#TIME_UNSET} to output to the end of the chunk.
     * @param chunkIndex The index of the chunk, or {@link C#INDEX_UNSET} if it is not known.
     * @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 chunkExtractor A wrapped extractor to use for parsing the data.
     */
    public ContainerMediaChunk(
        DataSource dataSource,
        DataSpec dataSpec,
        Format trackFormat,
        @C.SelectionReason int trackSelectionReason,
        @Nullable Object trackSelectionData,
        long startTimeUs,
        long endTimeUs,
        long clippedStartTimeUs,
        long clippedEndTimeUs,
        long chunkIndex,
        int chunkCount,
        long sampleOffsetUs,
        ChunkExtractor chunkExtractor) {
      super(
          dataSource,
          dataSpec,
          trackFormat,
          trackSelectionReason,
          trackSelectionData,
          startTimeUs,
          endTimeUs,
          clippedStartTimeUs,
          clippedEndTimeUs,
          chunkIndex);
      this.chunkCount = chunkCount;
      this.sampleOffsetUs = sampleOffsetUs;
      this.chunkExtractor = chunkExtractor;
    }
  
    @Override
    public long getNextChunkIndex() {
      return chunkIndex + chunkCount;
    }
  
    @Override
    public boolean isLoadCompleted() {
      return loadCompleted;
    }
  
    // Loadable implementation.
  
    @Override
    public final void cancelLoad() {
      loadCanceled = true;
    }
  
    @SuppressWarnings("NonAtomicVolatileUpdate")
    @Override
    public final void load() throws IOException {
      if (nextLoadPosition == 0) {
        // Configure the output and set it as the target for the extractor wrapper.
        BaseMediaChunkOutput output = getOutput();
        output.setSampleOffsetUs(sampleOffsetUs);
        chunkExtractor.init(
            getTrackOutputProvider(output),
            clippedStartTimeUs == C.TIME_UNSET ? C.TIME_UNSET : (clippedStartTimeUs - sampleOffsetUs),
            clippedEndTimeUs == C.TIME_UNSET ? C.TIME_UNSET : (clippedEndTimeUs - sampleOffsetUs));
      }
      try {
        // Create and open the input.
        DataSpec loadDataSpec = dataSpec.subrange(nextLoadPosition);
        ExtractorInput input =
            new DefaultExtractorInput(
                dataSource, loadDataSpec.position, dataSource.open(loadDataSpec));
        // Load and decode the sample data.
        try {
          while (!loadCanceled && chunkExtractor.read(input)) {}
        } finally {
          nextLoadPosition = input.getPosition() - dataSpec.position;
        }
      } finally {
        DataSourceUtil.closeQuietly(dataSource);
      }
      loadCompleted = !loadCanceled;
    }
  
    /**
     * Returns the {@link TrackOutputProvider} to be used by the wrapped extractor.
     *
     * @param baseMediaChunkOutput The {@link BaseMediaChunkOutput} most recently passed to {@link
     *     #init(BaseMediaChunkOutput)}.
     * @return A {@link TrackOutputProvider} to be used by the wrapped extractor.
     */
    protected TrackOutputProvider getTrackOutputProvider(BaseMediaChunkOutput baseMediaChunkOutput) {
      return baseMediaChunkOutput;
    }
  }
  