int ff_adts_decode_extradata(AVFormatContext *s, ADTSContext *adts, uint8_t *buf, int size)
{
GetBitContext gb;
PutBitContext pb;
MPEG4AudioConfig m4ac;
int off;
init_get_bits(&gb, buf, size * 8);
off = ff_mpeg4audio_get_config(&m4ac, buf, size);
if (off < 0)
return off;
skip_bits_long(&gb, off);
adts->objecttype = m4ac.object_type - 1;
adts->sample_rate_index = m4ac.sampling_index;
adts->channel_conf = m4ac.chan_config;
if (adts->objecttype > 3U) {
av_log(s, AV_LOG_ERROR, "MPEG-4 AOT %d is not allowed in ADTS\n", adts->objecttype+1);
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 (get_bits(&gb, 1)) {
av_log(s, AV_LOG_ERROR, "960/120 MDCT window is not allowed in ADTS\n");
return -1;
}
if (get_bits(&gb, 1)) {
av_log(s, AV_LOG_ERROR, "Scalable configurations are not allowed in ADTS\n");
return -1;
}
if (get_bits(&gb, 1)) {
av_log(s, AV_LOG_ERROR, "Extension flag is not allowed in ADTS\n");
return -1;
}
if (!adts->channel_conf) {
init_put_bits(&pb, adts->pce_data, MAX_PCE_SIZE);
put_bits(&pb, 3, 5); //ID_PCE
adts->pce_size = (ff_copy_pce_data(&pb, &gb) + 3) / 8;
flush_put_bits(&pb);
}
adts->write_adts = 1;
return 0;
}
int ff_mp4_read_dec_config_descr(AVFormatContext *fc, AVStream *st, AVIOContext *pb)
{
int len, tag;
int object_type_id = avio_r8(pb);
avio_r8(pb); /* stream type */
avio_rb24(pb); /* buffer size db */
avio_rb32(pb); /* max bitrate */
avio_rb32(pb); /* avg bitrate */
st->codec->codec_id= ff_codec_get_id(ff_mp4_obj_type, object_type_id);
av_dlog(fc, "esds object type id 0x%02x\n", object_type_id);
len = ff_mp4_read_descr(fc, pb, &tag);
if (tag == MP4DecSpecificDescrTag)
{
av_dlog(fc, "Specific MPEG4 header len=%d\n", len);
if((uint64_t)len > (1<<30))
return -1;
av_free(st->codec->extradata);
st->codec->extradata = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE);
if (!st->codec->extradata)
return AVERROR(ENOMEM);
avio_read(pb, st->codec->extradata, len);
st->codec->extradata_size = len;
if (st->codec->codec_id == CODEC_ID_AAC)
{
MPEG4AudioConfig cfg;
ff_mpeg4audio_get_config(&cfg, st->codec->extradata,
st->codec->extradata_size);
st->codec->channels = cfg.channels;
if (cfg.object_type == 29 && cfg.sampling_index < 3) // old mp3on4
st->codec->sample_rate = ff_mpa_freq_tab[cfg.sampling_index];
else if (cfg.ext_sample_rate)
st->codec->sample_rate = cfg.ext_sample_rate;
else
st->codec->sample_rate = cfg.sample_rate;
av_dlog(fc, "mp4a config channels %d obj %d ext obj %d "
"sample rate %d ext sample rate %d\n", st->codec->channels,
cfg.object_type, cfg.ext_object_type,
cfg.sample_rate, cfg.ext_sample_rate);
if (!(st->codec->codec_id = ff_codec_get_id(mp4_audio_types,
cfg.object_type)))
st->codec->codec_id = CODEC_ID_AAC;
}
}
return 0;
}
