int ff_mp4_read_dec_config_descr(AVFormatContext *fc, AVStream *st, AVIOContext *pb) { enum AVCodecID codec_id; unsigned v; int len, tag; int ret; int object_type_id = avio_r8(pb); avio_r8(pb); /* stream type */ avio_rb24(pb); /* buffer size db */ v = avio_rb32(pb); // TODO: fix this with codecpar #if FF_API_LAVF_AVCTX FF_DISABLE_DEPRECATION_WARNINGS if (v < INT32_MAX) st->codec->rc_max_rate = v; FF_ENABLE_DEPRECATION_WARNINGS #endif st->codecpar->bit_rate = avio_rb32(pb); /* avg bitrate */ codec_id= ff_codec_get_id(ff_mp4_obj_type, object_type_id); if (codec_id) st->codecpar->codec_id = codec_id; av_log(fc, AV_LOG_TRACE, "esds object type id 0x%02x\n", object_type_id); len = ff_mp4_read_descr(fc, pb, &tag); if (tag == MP4DecSpecificDescrTag) { av_log(fc, AV_LOG_TRACE, "Specific MPEG-4 header len=%d\n", len); if (!len || (uint64_t)len > (1<<30)) return -1; av_free(st->codecpar->extradata); if ((ret = ff_get_extradata(fc, st->codecpar, pb, len)) < 0) return ret; if (st->codecpar->codec_id == AV_CODEC_ID_AAC) { MPEG4AudioConfig cfg = {0}; avpriv_mpeg4audio_get_config(&cfg, st->codecpar->extradata, st->codecpar->extradata_size * 8, 1); st->codecpar->channels = cfg.channels; if (cfg.object_type == 29 && cfg.sampling_index < 3) // old mp3on4 st->codecpar->sample_rate = avpriv_mpa_freq_tab[cfg.sampling_index]; else if (cfg.ext_sample_rate) st->codecpar->sample_rate = cfg.ext_sample_rate; else st->codecpar->sample_rate = cfg.sample_rate; av_log(fc, AV_LOG_TRACE, "mp4a config channels %d obj %d ext obj %d " "sample rate %d ext sample rate %d\n", st->codecpar->channels, cfg.object_type, cfg.ext_object_type, cfg.sample_rate, cfg.ext_sample_rate); if (!(st->codecpar->codec_id = ff_codec_get_id(mp4_audio_types, cfg.object_type))) st->codecpar->codec_id = AV_CODEC_ID_AAC; } } return 0; }