static int mov_read_ddts(MOVContext *c, AVIOContext *pb, MOVAtom atom) { const uint32_t ddts_size = 20; AVStream *st = NULL; uint8_t *buf = NULL; uint32_t frame_duration_code = 0; uint32_t channel_layout_code = 0; GetBitContext gb; buf = av_malloc(ddts_size + AV_INPUT_BUFFER_PADDING_SIZE); if (!buf) { return AVERROR(ENOMEM); } if (avio_read(pb, buf, ddts_size) < ddts_size) { return AVERROR_INVALIDDATA; } init_get_bits(&gb, buf, 8*ddts_size); if (c->fc->nb_streams < 1) { return 0; } st = c->fc->streams[c->fc->nb_streams-1]; st->codecpar->sample_rate = get_bits_long(&gb, 32); if (st->codecpar->sample_rate <= 0) { av_log(c->fc, AV_LOG_ERROR, "Invalid sample rate %d\n", st->codecpar->sample_rate); return AVERROR_INVALIDDATA; } skip_bits_long(&gb, 32); /* max bitrate */ st->codecpar->bit_rate = get_bits_long(&gb, 32); st->codecpar->bits_per_coded_sample = get_bits(&gb, 8); frame_duration_code = get_bits(&gb, 2); skip_bits(&gb, 30); /* various fields */ channel_layout_code = get_bits(&gb, 16); st->codecpar->frame_size = (frame_duration_code == 0) ? 512 : (frame_duration_code == 1) ? 1024 : (frame_duration_code == 2) ? 2048 : (frame_duration_code == 3) ? 4096 : 0; if (channel_layout_code > 0xff) { av_log(c->fc, AV_LOG_WARNING, "Unsupported DTS audio channel layout"); } st->codecpar->channel_layout = ((channel_layout_code & 0x1) ? AV_CH_FRONT_CENTER : 0) | ((channel_layout_code & 0x2) ? AV_CH_FRONT_LEFT : 0) | ((channel_layout_code & 0x2) ? AV_CH_FRONT_RIGHT : 0) | ((channel_layout_code & 0x4) ? AV_CH_SIDE_LEFT : 0) | ((channel_layout_code & 0x4) ? AV_CH_SIDE_RIGHT : 0) | ((channel_layout_code & 0x8) ? AV_CH_LOW_FREQUENCY : 0); st->codecpar->channels = av_get_channel_layout_nb_channels(st->codecpar->channel_layout); return 0; }