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;
  
  import com.google.android.exoplayer2.util.Util;
  
  /**
   * Defines chunks of samples within a media stream.
   */
  public final class ChunkIndex implements SeekMap {
  
    /**
     * The number of chunks.
     */
    public final int length;
  
    /**
     * The chunk sizes, in bytes.
     */
    public final int[] sizes;
  
    /**
     * The chunk byte offsets.
     */
    public final long[] offsets;
  
    /**
     * The chunk durations, in microseconds.
     */
    public final long[] durationsUs;
  
    /**
     * The start time of each chunk, in microseconds.
     */
    public final long[] timesUs;
  
    private final long durationUs;
  
    /**
     * @param sizes The chunk sizes, in bytes.
     * @param offsets The chunk byte offsets.
     * @param durationsUs The chunk durations, in microseconds.
     * @param timesUs The start time of each chunk, in microseconds.
     */
    public ChunkIndex(int[] sizes, long[] offsets, long[] durationsUs, long[] timesUs) {
      this.sizes = sizes;
      this.offsets = offsets;
      this.durationsUs = durationsUs;
      this.timesUs = timesUs;
      length = sizes.length;
      if (length > 0) {
        durationUs = durationsUs[length - 1] + timesUs[length - 1];
      } else {
        durationUs = 0;
      }
    }
  
    /**
     * Obtains the index of the chunk corresponding to a given time.
     *
     * @param timeUs The time, in microseconds.
     * @return The index of the corresponding chunk.
     */
    public int getChunkIndex(long timeUs) {
      return Util.binarySearchFloor(timesUs, timeUs, true, true);
    }
  
    // SeekMap implementation.
  
    @Override
    public boolean isSeekable() {
      return true;
    }
  
    @Override
    public long getDurationUs() {
      return durationUs;
    }
  
    @Override
    public SeekPoints getSeekPoints(long timeUs) {
      int chunkIndex = getChunkIndex(timeUs);
      SeekPoint seekPoint = new SeekPoint(timesUs[chunkIndex], offsets[chunkIndex]);
      if (seekPoint.timeUs >= timeUs || chunkIndex == length - 1) {
        return new SeekPoints(seekPoint);
      } else {
        SeekPoint nextSeekPoint = new SeekPoint(timesUs[chunkIndex + 1], offsets[chunkIndex + 1]);
        return new SeekPoints(seekPoint, nextSeekPoint);
      }
    }
  
  }
  