Function ff_dca_parse_core_frame_header

libavcodec/dca.c:86–142

}

int ff_dca_parse_core_frame_header(DCACoreFrameHeader *h, GetBitContext *gb)
{
    if (get_bits_long(gb, 32) != DCA_SYNCWORD_CORE_BE)
        return DCA_PARSE_ERROR_SYNC_WORD;

    h->normal_frame = get_bits1(gb);
    h->deficit_samples = get_bits(gb, 5) + 1;
    if (h->deficit_samples != DCA_PCMBLOCK_SAMPLES)
        return DCA_PARSE_ERROR_DEFICIT_SAMPLES;

    h->crc_present = get_bits1(gb);
    h->npcmblocks = get_bits(gb, 7) + 1;
    if (h->npcmblocks & (DCA_SUBBAND_SAMPLES - 1))
        return DCA_PARSE_ERROR_PCM_BLOCKS;

    h->frame_size = get_bits(gb, 14) + 1;
    if (h->frame_size < 96)
        return DCA_PARSE_ERROR_FRAME_SIZE;

    h->audio_mode = get_bits(gb, 6);
    if (h->audio_mode >= DCA_AMODE_COUNT)
        return DCA_PARSE_ERROR_AMODE;

    h->sr_code = get_bits(gb, 4);
    if (!ff_dca_sample_rates[h->sr_code])
        return DCA_PARSE_ERROR_SAMPLE_RATE;

    h->br_code = get_bits(gb, 5);
    if (get_bits1(gb))
        return DCA_PARSE_ERROR_RESERVED_BIT;

    h->drc_present = get_bits1(gb);
    h->ts_present = get_bits1(gb);
    h->aux_present = get_bits1(gb);
    h->hdcd_master = get_bits1(gb);
    h->ext_audio_type = get_bits(gb, 3);
    h->ext_audio_present = get_bits1(gb);
    h->sync_ssf = get_bits1(gb);
    h->lfe_present = get_bits(gb, 2);
    if (h->lfe_present == DCA_LFE_FLAG_INVALID)
        return DCA_PARSE_ERROR_LFE_FLAG;

    h->predictor_history = get_bits1(gb);
    if (h->crc_present)
        skip_bits(gb, 16);
    h->filter_perfect = get_bits1(gb);
    h->encoder_rev = get_bits(gb, 4);
    h->copy_hist = get_bits(gb, 2);
    h->pcmr_code = get_bits(gb, 3);
    if (!ff_dca_bits_per_sample[h->pcmr_code])
        return DCA_PARSE_ERROR_PCM_RES;

    h->sumdiff_front = get_bits1(gb);
    h->sumdiff_surround = get_bits1(gb);
    h->dn_code = get_bits(gb, 4);
    return 0;
}