sclass MonoSamplesForwarder extends AbstractOutputStream {
  int halfSample = -1;
  O f; // voidfunc(float[])
  
  static bool debug;

  *() {}
  *(O *f) {}

  public void write(byte[] b, int ofs, int len) {
    int n = (len+(halfSample >= 0 ? 1 : 0))/2;
    float[] out = new float[n];
    int iOut = 0;
    if (debug) print(bytesToHex(subArray(b, ofs, ofs+min(8, len))));
    for (int i = ofs; i < ofs+len; i++) {
      if (halfSample < 0)
        halfSample = ((int) b[i]) & 0x255;
      else {
        out[iOut++] = (halfSample | (((int) b[i]) << 8))/32768f;
        halfSample = -1;
      }
    }
    if (n != 0) callF(f, out);
  }
}

Began life as a copy of #1009775