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.util;
  
  /**
   * Holder for FLAC stream info.
   */
  public final class FlacStreamInfo {
  
    public final int minBlockSize;
    public final int maxBlockSize;
    public final int minFrameSize;
    public final int maxFrameSize;
    public final int sampleRate;
    public final int channels;
    public final int bitsPerSample;
    public final long totalSamples;
  
    /**
     * Constructs a FlacStreamInfo parsing the given binary FLAC stream info metadata structure.
     *
     * @param data An array holding FLAC stream info metadata structure
     * @param offset Offset of the structure in the array
     * @see <a href="https://xiph.org/flac/format.html#metadata_block_streaminfo">FLAC format
     *     METADATA_BLOCK_STREAMINFO</a>
     */
    public FlacStreamInfo(byte[] data, int offset) {
      ParsableBitArray scratch = new ParsableBitArray(data);
      scratch.setPosition(offset * 8);
      this.minBlockSize = scratch.readBits(16);
      this.maxBlockSize = scratch.readBits(16);
      this.minFrameSize = scratch.readBits(24);
      this.maxFrameSize = scratch.readBits(24);
      this.sampleRate = scratch.readBits(20);
      this.channels = scratch.readBits(3) + 1;
      this.bitsPerSample = scratch.readBits(5) + 1;
      this.totalSamples = ((scratch.readBits(4) & 0xFL) << 32)
          | (scratch.readBits(32) & 0xFFFFFFFFL);
      // Remaining 16 bytes is md5 value
    }
  
    public FlacStreamInfo(int minBlockSize, int maxBlockSize, int minFrameSize, int maxFrameSize,
        int sampleRate, int channels, int bitsPerSample, long totalSamples) {
      this.minBlockSize = minBlockSize;
      this.maxBlockSize = maxBlockSize;
      this.minFrameSize = minFrameSize;
      this.maxFrameSize = maxFrameSize;
      this.sampleRate = sampleRate;
      this.channels = channels;
      this.bitsPerSample = bitsPerSample;
      this.totalSamples = totalSamples;
    }
  
    public int maxDecodedFrameSize() {
      return maxBlockSize * channels * (bitsPerSample / 8);
    }
  
    public int bitRate() {
      return bitsPerSample * sampleRate;
    }
  
    public long durationUs() {
      return (totalSamples * 1000000L) / sampleRate;
    }
  
  }
  