// The core integral 1D image.
sclass StaticAudioSample implements IAudioSample {
  int channels;
  double sampleRate;
  int length;
  
  // Here they are: the partial sums of the 16 bit audio samples
  // in an array of 6-byte integers. Channels are stored interleaved.
  HalfLongs data;
  
  public double sampleRate() { ret sampleRate; }
  public int channels() { ret channels; }
  public DoubleRange bounds() { ret DoubleRange(0, length); }
  
  // Get an entry of the sum table - allow for out-of-bounds
  // requests (those just default to silence).
  public double readSumTable(int channel, int i) {
    if (i < 0) ret 0;
    i = min(i, length-1);
    ret data.get(i*channels+channel);
  }
  
  // perform the integration of the raw audio data
  *(L<short[]> samples, int *channels, double *sampleRate) {
    length = lengthLevel2_shortArrays(samples);
    data = new HalfLongs(length*channels);
    long[] sums = new[channels];
    int iSample = 0, iChunk = 0, iInArray = 0;
    short[] chunk = null;
    for i to length:
      for c to channels: {
        if (chunk == null || iInArray >= chunk.length) {
          chunk = samples.get(iChunk++);
          iInArray = 0;
        }
        data.set(iSample++, sums[c] += chunk[iInArray++]);
      }
  }
}