static int mov_read_dec3(MOVContext *c, AVIOContext *pb, MOVAtom atom) { AVStream *st; enum AVAudioServiceType *ast; int eac3info, acmod, lfeon, bsmod; if (c->fc->nb_streams < 1) return 0; st = c->fc->streams[c->fc->nb_streams-1]; ast = (enum AVAudioServiceType*)ff_stream_new_side_data(st, AV_PKT_DATA_AUDIO_SERVICE_TYPE, sizeof(*ast)); if (!ast) return AVERROR(ENOMEM); /* No need to parse fields for additional independent substreams and its * associated dependent substreams since libavcodec's E-AC-3 decoder * does not support them yet. */ avio_rb16(pb); /* data_rate and num_ind_sub */ eac3info = avio_rb24(pb); bsmod = (eac3info >> 12) & 0x1f; acmod = (eac3info >> 9) & 0x7; lfeon = (eac3info >> 8) & 0x1; st->codec->channel_layout = avpriv_ac3_channel_layout_tab[acmod]; if (lfeon) st->codec->channel_layout |= AV_CH_LOW_FREQUENCY; st->codec->channels = av_get_channel_layout_nb_channels(st->codec->channel_layout); *ast = bsmod; if (st->codec->channels > 1 && bsmod == 0x7) *ast = AV_AUDIO_SERVICE_TYPE_KARAOKE; st->codec->audio_service_type = *ast; return 0; }