samples = (short*)(as->aud_dec_sample + as->aud_dec_offset);

  ictx->sample_fmt =  AV_SAMPLE_FMT_S16;

  if ((length = avcodec_decode_audio3(ictx, samples, &len, &packet)) <= 0) {
    tvhlog(LOG_ERR, "transcode", "Unable to decode audio (%d)", length);
    ts->ts_index = 0;
    goto cleanup;
  }