static int decode_extradata(AVFormatContext *s, ADTSContext *adts, uint8_t *buf, int size) { GetBitContext gb; init_get_bits(&gb, buf, size * 8); adts->objecttype = get_bits(&gb, 5) - 1; adts->sample_rate_index = get_bits(&gb, 4); adts->channel_conf = get_bits(&gb, 4); if (adts->objecttype > 3) { av_log(s, AV_LOG_ERROR, "MPEG-4 AOT %d is not allowed in ADTS\n", adts->objecttype); return -1; } if (adts->sample_rate_index == 15) { av_log(s, AV_LOG_ERROR, "Escape sample rate index illegal in ADTS\n"); return -1; } if (adts->channel_conf == 0) { ff_log_missing_feature(s, "PCE based channel configuration", 0); return -1; } adts->write_adts = 1; return 0; }