int avpriv_dca_parse_core_frame_header(GetBitContext *gb, DCACoreFrameHeader *h) { 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 (!avpriv_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; }