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Diffstat (limited to 'ac3dec/parse.c')
| -rw-r--r-- | ac3dec/parse.c | 481 |
1 files changed, 0 insertions, 481 deletions
diff --git a/ac3dec/parse.c b/ac3dec/parse.c deleted file mode 100644 index 49ea57c6..00000000 --- a/ac3dec/parse.c +++ /dev/null @@ -1,481 +0,0 @@ -/* - * parse.c - * - * Copyright (C) Aaron Holtzman - May 1999 - * - * This file is part of ac3dec, a free Dolby AC-3 stream decoder. - * - * ac3dec is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2, or (at your option) - * any later version. - * - * ac3dec is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with GNU Make; see the file COPYING. If not, write to - * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. - * - * - */ - -#include <stdlib.h> -#include <stdio.h> -#include "ac3.h" -#include "ac3_internal.h" - - -#include "bitstream.h" -#include "stats.h" -#include "debug.h" -#include "crc.h" -#include "parse.h" - -/* Misc LUT */ -static const uint16_t nfchans[8] = {2,1,2,3,3,4,4,5}; - -struct frmsize_s -{ - uint16_t bit_rate; - uint16_t frm_size[3]; -}; - -static const struct frmsize_s frmsizecod_tbl[64] = -{ - { 32 ,{64 ,69 ,96 } }, - { 32 ,{64 ,70 ,96 } }, - { 40 ,{80 ,87 ,120 } }, - { 40 ,{80 ,88 ,120 } }, - { 48 ,{96 ,104 ,144 } }, - { 48 ,{96 ,105 ,144 } }, - { 56 ,{112 ,121 ,168 } }, - { 56 ,{112 ,122 ,168 } }, - { 64 ,{128 ,139 ,192 } }, - { 64 ,{128 ,140 ,192 } }, - { 80 ,{160 ,174 ,240 } }, - { 80 ,{160 ,175 ,240 } }, - { 96 ,{192 ,208 ,288 } }, - { 96 ,{192 ,209 ,288 } }, - { 112 ,{224 ,243 ,336 } }, - { 112 ,{224 ,244 ,336 } }, - { 128 ,{256 ,278 ,384 } }, - { 128 ,{256 ,279 ,384 } }, - { 160 ,{320 ,348 ,480 } }, - { 160 ,{320 ,349 ,480 } }, - { 192 ,{384 ,417 ,576 } }, - { 192 ,{384 ,418 ,576 } }, - { 224 ,{448 ,487 ,672 } }, - { 224 ,{448 ,488 ,672 } }, - { 256 ,{512 ,557 ,768 } }, - { 256 ,{512 ,558 ,768 } }, - { 320 ,{640 ,696 ,960 } }, - { 320 ,{640 ,697 ,960 } }, - { 384 ,{768 ,835 ,1152 } }, - { 384 ,{768 ,836 ,1152 } }, - { 448 ,{896 ,975 ,1344 } }, - { 448 ,{896 ,976 ,1344 } }, - { 512 ,{1024 ,1114 ,1536 } }, - { 512 ,{1024 ,1115 ,1536 } }, - { 576 ,{1152 ,1253 ,1728 } }, - { 576 ,{1152 ,1254 ,1728 } }, - { 640 ,{1280 ,1393 ,1920 } }, - { 640 ,{1280 ,1394 ,1920 } } -}; - -/* Parse a syncinfo structure, minus the sync word */ -void parse_syncinfo(syncinfo_t *syncinfo, uint8_t *data) -{ - // - // We need to read in the entire syncinfo struct (0x0b77 + 24 bits) - // in order to determine how big the frame is - // - - // Get the sampling rate - syncinfo->fscod = (data[2] >> 6) & 0x3; - - if(syncinfo->fscod == 3) { - //invalid sampling rate code - return; - } - else if(syncinfo->fscod == 2) - syncinfo->sampling_rate = 32000; - else if(syncinfo->fscod == 1) - syncinfo->sampling_rate = 44100; - else - syncinfo->sampling_rate = 48000; - - // Get the frame size code - syncinfo->frmsizecod = data[2] & 0x3f; - - // Calculate the frame size and bitrate - syncinfo->frame_size = - frmsizecod_tbl[syncinfo->frmsizecod].frm_size[syncinfo->fscod]; - syncinfo->bit_rate = frmsizecod_tbl[syncinfo->frmsizecod].bit_rate; - -} - - -/** - * This routine fills a bsi struct from the AC3 stream - **/ - -void parse_bsi(bsi_t *bsi) -{ - /* Check the AC-3 version number */ - bsi->bsid = bitstream_get(5); - - /* Get the audio service provided by the steram */ - bsi->bsmod = bitstream_get(3); - - /* Get the audio coding mode (ie how many channels)*/ - bsi->acmod = bitstream_get(3); - /* Predecode the number of full bandwidth channels as we use this - * number a lot */ - bsi->nfchans = nfchans[bsi->acmod]; - - /* If it is in use, get the centre channel mix level */ - if ((bsi->acmod & 0x1) && (bsi->acmod != 0x1)) - bsi->cmixlev = bitstream_get(2); - - /* If it is in use, get the surround channel mix level */ - if (bsi->acmod & 0x4) - bsi->surmixlev = bitstream_get(2); - - /* Get the dolby surround mode if in 2/0 mode */ - if(bsi->acmod == 0x2) - bsi->dsurmod= bitstream_get(2); - - /* Is the low frequency effects channel on? */ - bsi->lfeon = bitstream_get(1); - - /* Get the dialogue normalization level */ - bsi->dialnorm = bitstream_get(5); - - /* Does compression gain exist? */ - if ((bsi->compre = bitstream_get(1))) { - /* Get compression gain */ - bsi->compr = bitstream_get(8); - } - - /* Does language code exist? */ - if ((bsi->langcode = bitstream_get(1))) { - /* Get langauge code */ - bsi->langcod = bitstream_get(8); - } - - /* Does audio production info exist? */ - if ((bsi->audprodie = bitstream_get(1))) { - /* Get mix level */ - bsi->mixlevel = bitstream_get(5); - - /* Get room type */ - bsi->roomtyp = bitstream_get(2); - } - - /* If we're in dual mono mode then get some extra info */ - if (!bsi->acmod) { - /* Get the dialogue normalization level two */ - bsi->dialnorm2 = bitstream_get(5); - - /* Does compression gain two exist? */ - if ((bsi->compr2e = bitstream_get(1))) { - /* Get compression gain two */ - bsi->compr2 = bitstream_get(8); - } - - /* Does language code two exist? */ - if ((bsi->langcod2e = bitstream_get(1))) { - /* Get langauge code two */ - bsi->langcod2 = bitstream_get(8); - } - - /* Does audio production info two exist? */ - if ((bsi->audprodi2e = bitstream_get(1))) { - /* Get mix level two */ - bsi->mixlevel2 = bitstream_get(5); - - /* Get room type two */ - bsi->roomtyp2 = bitstream_get(2); - } - } - - /* Get the copyright bit */ - bsi->copyrightb = bitstream_get(1); - - /* Get the original bit */ - bsi->origbs = bitstream_get(1); - - /* Does timecode one exist? */ - if ((bsi->timecod1e = bitstream_get(1))) - bsi->timecod1 = bitstream_get(14); - - /* Does timecode two exist? */ - if ((bsi->timecod2e = bitstream_get(1))) - bsi->timecod2 = bitstream_get(14); - - /* Does addition info exist? */ - if ((bsi->addbsie = bitstream_get(1))) { - uint32_t i; - - /* Get how much info is there */ - bsi->addbsil = bitstream_get(6); - - /* Get the additional info */ - for(i=0;i<(bsi->addbsil + 1);i++) - bsi->addbsi[i] = bitstream_get(8); - } - - stats_print_bsi(bsi); -} - - -/* More pain inducing parsing */ -void parse_audblk(bsi_t *bsi,audblk_t *audblk) -{ - int i,j; - - for (i=0; i < bsi->nfchans; i++) { - /* Is this channel an interleaved 256 + 256 block ? */ - audblk->blksw[i] = bitstream_get(1); - } - - for (i=0;i < bsi->nfchans; i++) { - /* Should we dither this channel? */ - audblk->dithflag[i] = bitstream_get(1); - } - - /* Does dynamic range control exist? */ - if ((audblk->dynrnge = bitstream_get(1))) { - /* Get dynamic range info */ - audblk->dynrng = bitstream_get(8); - } - - /* If we're in dual mono mode then get the second channel DR info */ - if (bsi->acmod == 0) { - /* Does dynamic range control two exist? */ - if ((audblk->dynrng2e = bitstream_get(1))) { - /* Get dynamic range info */ - audblk->dynrng2 = bitstream_get(8); - } - } - - /* Does coupling strategy exist? */ - if ((audblk->cplstre = bitstream_get(1))) { - /* Is coupling turned on? */ - if ((audblk->cplinu = bitstream_get(1))) { - for(i=0;i < bsi->nfchans; i++) - audblk->chincpl[i] = bitstream_get(1); - if(bsi->acmod == 0x2) - audblk->phsflginu = bitstream_get(1); - audblk->cplbegf = bitstream_get(4); - audblk->cplendf = bitstream_get(4); - audblk->ncplsubnd = (audblk->cplendf + 2) - audblk->cplbegf + 1; - - /* Calculate the start and end bins of the coupling channel */ - audblk->cplstrtmant = (audblk->cplbegf * 12) + 37 ; - audblk->cplendmant = ((audblk->cplendf + 3) * 12) + 37; - - /* The number of combined subbands is ncplsubnd minus each combined - * band */ - audblk->ncplbnd = audblk->ncplsubnd; - - for(i=1; i< audblk->ncplsubnd; i++) { - audblk->cplbndstrc[i] = bitstream_get(1); - audblk->ncplbnd -= audblk->cplbndstrc[i]; - } - } - } - - if(audblk->cplinu) { - /* Loop through all the channels and get their coupling co-ords */ - for(i=0;i < bsi->nfchans;i++) { - if(!audblk->chincpl[i]) - continue; - - /* Is there new coupling co-ordinate info? */ - if ((audblk->cplcoe[i] = bitstream_get(1))) { - audblk->mstrcplco[i] = bitstream_get(2); - for(j=0;j < audblk->ncplbnd; j++) { - audblk->cplcoexp[i][j] = bitstream_get(4); - audblk->cplcomant[i][j] = bitstream_get(4); - } - } - } - - /* If we're in dual mono mode, there's going to be some phase info */ - if( (bsi->acmod == 0x2) && audblk->phsflginu && - (audblk->cplcoe[0] || audblk->cplcoe[1])) { - for(j=0;j < audblk->ncplbnd; j++) - audblk->phsflg[j] = bitstream_get(1); - - } - } - - /* If we're in dual mono mode, there may be a rematrix strategy */ - if(bsi->acmod == 0x2) { - if ((audblk->rematstr = bitstream_get(1))) { - if (!audblk->cplinu) { - for(i = 0; i < 4; i++) - audblk->rematflg[i] = bitstream_get(1); - } - if((audblk->cplbegf > 2) && audblk->cplinu) { - for(i = 0; i < 4; i++) - audblk->rematflg[i] = bitstream_get(1); - } - if((audblk->cplbegf <= 2) && audblk->cplinu) { - for(i = 0; i < 3; i++) - audblk->rematflg[i] = bitstream_get(1); - } - if((audblk->cplbegf == 0) && audblk->cplinu) - for(i = 0; i < 2; i++) - audblk->rematflg[i] = bitstream_get(1); - - } - } - - if (audblk->cplinu) { - /* Get the coupling channel exponent strategy */ - audblk->cplexpstr = bitstream_get(2); - audblk->ncplgrps = (audblk->cplendmant - audblk->cplstrtmant) / - (3 << (audblk->cplexpstr-1)); - } - - for(i = 0; i < bsi->nfchans; i++) - audblk->chexpstr[i] = bitstream_get(2); - - /* Get the exponent strategy for lfe channel */ - if(bsi->lfeon) - audblk->lfeexpstr = bitstream_get(1); - - /* Determine the bandwidths of all the fbw channels */ - for(i = 0; i < bsi->nfchans; i++) { - uint16_t grp_size; - - if(audblk->chexpstr[i] != EXP_REUSE) { - if (audblk->cplinu && audblk->chincpl[i]) { - audblk->endmant[i] = audblk->cplstrtmant; - } else { - audblk->chbwcod[i] = bitstream_get(6); - audblk->endmant[i] = ((audblk->chbwcod[i] + 12) * 3) + 37; - } - - /* Calculate the number of exponent groups to fetch */ - grp_size = 3 * (1 << (audblk->chexpstr[i] - 1)); - audblk->nchgrps[i] = (audblk->endmant[i] - 1 + (grp_size - 3)) / grp_size; - } - } - - /* Get the coupling exponents if they exist */ - if(audblk->cplinu && (audblk->cplexpstr != EXP_REUSE)) { - audblk->cplabsexp = bitstream_get(4); - for(i=0;i< audblk->ncplgrps;i++) - audblk->cplexps[i] = bitstream_get(7); - } - - /* Get the fwb channel exponents */ - for(i=0;i < bsi->nfchans; i++) { - if(audblk->chexpstr[i] != EXP_REUSE) { - audblk->exps[i][0] = bitstream_get(4); - for(j=1;j<=audblk->nchgrps[i];j++) - audblk->exps[i][j] = bitstream_get(7); - audblk->gainrng[i] = bitstream_get(2); - } - } - - /* Get the lfe channel exponents */ - if(bsi->lfeon && (audblk->lfeexpstr != EXP_REUSE)) { - audblk->lfeexps[0] = bitstream_get(4); - audblk->lfeexps[1] = bitstream_get(7); - audblk->lfeexps[2] = bitstream_get(7); - } - - /* Get the parametric bit allocation parameters */ - audblk->baie = bitstream_get(1); - - if(audblk->baie) { - audblk->sdcycod = bitstream_get(2); - audblk->fdcycod = bitstream_get(2); - audblk->sgaincod = bitstream_get(2); - audblk->dbpbcod = bitstream_get(2); - audblk->floorcod = bitstream_get(3); - } - - /* Get the SNR off set info if it exists */ - audblk->snroffste = bitstream_get(1); - - if(audblk->snroffste) { - audblk->csnroffst = bitstream_get(6); - - if(audblk->cplinu) { - audblk->cplfsnroffst = bitstream_get(4); - audblk->cplfgaincod = bitstream_get(3); - } - - for(i = 0;i < bsi->nfchans; i++) { - audblk->fsnroffst[i] = bitstream_get(4); - audblk->fgaincod[i] = bitstream_get(3); - } - if(bsi->lfeon) { - - audblk->lfefsnroffst = bitstream_get(4); - audblk->lfefgaincod = bitstream_get(3); - } - } - - /* Get coupling leakage info if it exists */ - if(audblk->cplinu) { - audblk->cplleake = bitstream_get(1); - - if(audblk->cplleake) { - audblk->cplfleak = bitstream_get(3); - audblk->cplsleak = bitstream_get(3); - } - } - - /* Get the delta bit alloaction info */ - audblk->deltbaie = bitstream_get(1); - - if(audblk->deltbaie) { - if(audblk->cplinu) - audblk->cpldeltbae = bitstream_get(2); - - for(i = 0;i < bsi->nfchans; i++) - audblk->deltbae[i] = bitstream_get(2); - - if (audblk->cplinu && (audblk->cpldeltbae == DELTA_BIT_NEW)) { - audblk->cpldeltnseg = bitstream_get(3); - for(i = 0;i < audblk->cpldeltnseg + 1; i++) { - audblk->cpldeltoffst[i] = bitstream_get(5); - audblk->cpldeltlen[i] = bitstream_get(4); - audblk->cpldeltba[i] = bitstream_get(3); - } - } - - for(i = 0;i < bsi->nfchans; i++) { - if (audblk->deltbae[i] == DELTA_BIT_NEW) { - audblk->deltnseg[i] = bitstream_get(3); - for(j = 0; j < audblk->deltnseg[i] + 1; j++) { - audblk->deltoffst[i][j] = bitstream_get(5); - audblk->deltlen[i][j] = bitstream_get(4); - audblk->deltba[i][j] = bitstream_get(3); - } - } - } - } - - /* Check to see if there's any dummy info to get */ - if((audblk->skiple = bitstream_get(1))) { - uint16_t skip_data; - - audblk->skipl = bitstream_get(9); - - for (i = 0; i < audblk->skipl; i++) { - skip_data = bitstream_get(8); - } - } - - stats_print_audblk(bsi,audblk); -} |