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.upstream.DataSource;
  import com.google.android.exoplayer2.upstream.DataSpec;
  
  /**
   * A base implementation of {@link MediaChunk} that outputs to a {@link BaseMediaChunkOutput}.
   */
  public abstract class BaseMediaChunk extends MediaChunk {
  
    private BaseMediaChunkOutput output;
    private int[] firstSampleIndices;
  
    /**
     * @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.
     */
    public BaseMediaChunk(
        DataSource dataSource,
        DataSpec dataSpec,
        Format trackFormat,
        int trackSelectionReason,
        Object trackSelectionData,
        long startTimeUs,
        long endTimeUs,
        long chunkIndex) {
      super(dataSource, dataSpec, trackFormat, trackSelectionReason, trackSelectionData, startTimeUs,
          endTimeUs, chunkIndex);
    }
  
    /**
     * Initializes the chunk for loading, setting the {@link BaseMediaChunkOutput} that will receive
     * samples as they are loaded.
     *
     * @param output The output that will receive the loaded media samples.
     */
    public void init(BaseMediaChunkOutput output) {
      this.output = output;
      firstSampleIndices = output.getWriteIndices();
    }
  
    /**
     * Returns the index of the first sample in the specified track of the output that will originate
     * from this chunk.
     */
    public final int getFirstSampleIndex(int trackIndex) {
      return firstSampleIndices[trackIndex];
    }
  
    /**
     * Returns the output most recently passed to {@link #init(BaseMediaChunkOutput)}.
     */
    protected final BaseMediaChunkOutput getOutput() {
      return output;
    }
  
  }
  