// 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++]);

      }

  }

}