static int mov_read_dac3(MOVContext *c, AVIOContext *pb, MOVAtom atom) { AVStream *st; enum AVAudioServiceType *ast; int ac3info, 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); ac3info = avio_rb24(pb); bsmod = (ac3info >> 14) & 0x7; acmod = (ac3info >> 11) & 0x7; lfeon = (ac3info >> 10) & 0x1; st->codec->channels = ((int[]){2,1,2,3,3,4,4,5})[acmod] + lfeon; st->codec->channel_layout = avpriv_ac3_channel_layout_tab[acmod]; if (lfeon) st->codec->channel_layout |= AV_CH_LOW_FREQUENCY; *ast = bsmod; if (st->codec->channels > 1 && bsmod == 0x7) *ast = AV_AUDIO_SERVICE_TYPE_KARAOKE; st->codec->audio_service_type = *ast; return 0; }