1 /*****************************************************************************
2 * ac3_parse.c: ac3 parsing procedures
3 *****************************************************************************
4 * Copyright (C) 1999-2001 VideoLAN
5 * $Id: ac3_parse.c,v 1.5 2001/12/10 04:53:10 sam Exp $
7 * Authors: Michel Kaempf <maxx@via.ecp.fr>
8 * Aaron Holtzman <aholtzma@engr.uvic.ca>
9 * Renaud Dartus <reno@videolan.org>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
24 *****************************************************************************/
26 /*****************************************************************************
28 *****************************************************************************/
31 #include <string.h> /* memset() */
38 #include "audio_output.h"
40 #include "stream_control.h"
41 #include "input_ext-dec.h"
44 #include "modules_export.h"
46 #include "ac3_imdct.h"
47 #include "ac3_downmix.h"
48 #include "ac3_decoder.h"
49 #include "ac3_adec.h" /* ac3dec_thread_t */
51 #include "ac3_internal.h" /* EXP_REUSE */
54 static const u16 nfchans[] = { 2, 1, 2, 3, 3, 4, 4, 5 };
62 static const struct frmsize_s frmsizecod_tbl[] =
64 { 32 ,{64 ,69 ,96 } },
65 { 32 ,{64 ,70 ,96 } },
66 { 40 ,{80 ,87 ,120 } },
67 { 40 ,{80 ,88 ,120 } },
68 { 48 ,{96 ,104 ,144 } },
69 { 48 ,{96 ,105 ,144 } },
70 { 56 ,{112 ,121 ,168 } },
71 { 56 ,{112 ,122 ,168 } },
72 { 64 ,{128 ,139 ,192 } },
73 { 64 ,{128 ,140 ,192 } },
74 { 80 ,{160 ,174 ,240 } },
75 { 80 ,{160 ,175 ,240 } },
76 { 96 ,{192 ,208 ,288 } },
77 { 96 ,{192 ,209 ,288 } },
78 { 112 ,{224 ,243 ,336 } },
79 { 112 ,{224 ,244 ,336 } },
80 { 128 ,{256 ,278 ,384 } },
81 { 128 ,{256 ,279 ,384 } },
82 { 160 ,{320 ,348 ,480 } },
83 { 160 ,{320 ,349 ,480 } },
84 { 192 ,{384 ,417 ,576 } },
85 { 192 ,{384 ,418 ,576 } },
86 { 224 ,{448 ,487 ,672 } },
87 { 224 ,{448 ,488 ,672 } },
88 { 256 ,{512 ,557 ,768 } },
89 { 256 ,{512 ,558 ,768 } },
90 { 320 ,{640 ,696 ,960 } },
91 { 320 ,{640 ,697 ,960 } },
92 { 384 ,{768 ,835 ,1152 } },
93 { 384 ,{768 ,836 ,1152 } },
94 { 448 ,{896 ,975 ,1344 } },
95 { 448 ,{896 ,976 ,1344 } },
96 { 512 ,{1024 ,1114 ,1536 } },
97 { 512 ,{1024 ,1115 ,1536 } },
98 { 576 ,{1152 ,1253 ,1728 } },
99 { 576 ,{1152 ,1254 ,1728 } },
100 { 640 ,{1280 ,1393 ,1920 } },
101 { 640 ,{1280 ,1394 ,1920 } }};
103 static const int fscod_tbl[] = {48000, 44100, 32000};
105 /* Some internal functions */
107 static void parse_bsi_stats (ac3dec_t * p_ac3dec);
108 static void parse_audblk_stats (ac3dec_t * p_ac3dec);
111 /* Parse a syncinfo structure */
112 int ac3_sync_frame (ac3dec_t * p_ac3dec, ac3_sync_info_t * p_sync_info)
114 ac3dec_thread_t * p_ac3dec_t = (ac3dec_thread_t *) p_ac3dec->bit_stream.p_callback_arg;
116 p_ac3dec->total_bits_read = 0;
117 p_ac3dec->i_available = 0;
119 /* sync word - should be 0x0b77 */
120 RealignBits(&p_ac3dec->bit_stream);
121 while( (ShowBits (&p_ac3dec->bit_stream,16)) != 0x0b77 &&
122 (!p_ac3dec_t->p_fifo->b_die) && (!p_ac3dec_t->p_fifo->b_error))
124 RemoveBits (&p_ac3dec->bit_stream,8);
125 p_ac3dec->total_bits_read += 8;
127 RemoveBits (&p_ac3dec->bit_stream,16);
128 p_ac3dec->total_bits_read += 16;
131 /* Get crc1 - we don't actually use this data though */
132 GetBits (&p_ac3dec->bit_stream,16);
134 /* Get the sampling rate */
135 p_ac3dec->syncinfo.fscod = GetBits (&p_ac3dec->bit_stream,2);
137 if (p_ac3dec->syncinfo.fscod >= 3)
139 p_ac3dec->total_bits_read += 34;
143 /* Get the frame size code */
144 p_ac3dec->syncinfo.frmsizecod = GetBits (&p_ac3dec->bit_stream,6);
145 p_ac3dec->total_bits_read += 40;
147 if (p_ac3dec->syncinfo.frmsizecod >= 38)
152 p_sync_info->bit_rate = frmsizecod_tbl[p_ac3dec->syncinfo.frmsizecod].bit_rate;
154 p_ac3dec->syncinfo.frame_size = frmsizecod_tbl[p_ac3dec->syncinfo.frmsizecod].frm_size[p_ac3dec->syncinfo.fscod];
155 p_sync_info->frame_size = 2 * p_ac3dec->syncinfo.frame_size;
157 p_sync_info->sample_rate = fscod_tbl[p_ac3dec->syncinfo.fscod];
163 * This routine fills a bsi struct from the AC3 stream
165 int parse_bsi (ac3dec_t * p_ac3dec)
167 /* Check the AC-3 version number */
168 p_ac3dec->bsi.bsid = GetBits (&p_ac3dec->bit_stream,5);
170 if (p_ac3dec->bsi.bsid > 8)
175 /* Get the audio service provided by the stream */
176 p_ac3dec->bsi.bsmod = GetBits (&p_ac3dec->bit_stream,3);
178 /* Get the audio coding mode (ie how many channels)*/
179 p_ac3dec->bsi.acmod = GetBits (&p_ac3dec->bit_stream,3);
181 /* Predecode the number of full bandwidth channels as we use this
183 p_ac3dec->bsi.nfchans = nfchans[p_ac3dec->bsi.acmod];
185 /* If it is in use, get the centre channel mix level */
186 if ((p_ac3dec->bsi.acmod & 0x1) && (p_ac3dec->bsi.acmod != 0x1))
188 p_ac3dec->bsi.cmixlev = GetBits (&p_ac3dec->bit_stream,2);
189 p_ac3dec->total_bits_read += 2;
192 /* If it is in use, get the surround channel mix level */
193 if (p_ac3dec->bsi.acmod & 0x4)
195 p_ac3dec->bsi.surmixlev = GetBits (&p_ac3dec->bit_stream,2);
196 p_ac3dec->total_bits_read += 2;
199 /* Get the dolby surround mode if in 2/0 mode */
200 if (p_ac3dec->bsi.acmod == 0x2)
202 p_ac3dec->bsi.dsurmod = GetBits (&p_ac3dec->bit_stream,2);
203 p_ac3dec->total_bits_read += 2;
206 /* Is the low frequency effects channel on? */
207 p_ac3dec->bsi.lfeon = GetBits (&p_ac3dec->bit_stream,1);
209 /* Get the dialogue normalization level */
210 p_ac3dec->bsi.dialnorm = GetBits (&p_ac3dec->bit_stream,5);
212 /* Does compression gain exist? */
213 if ((p_ac3dec->bsi.compre = GetBits (&p_ac3dec->bit_stream,1)))
215 /* Get compression gain */
216 p_ac3dec->bsi.compr = GetBits (&p_ac3dec->bit_stream,8);
217 p_ac3dec->total_bits_read += 8;
220 /* Does language code exist? */
221 if ((p_ac3dec->bsi.langcode = GetBits (&p_ac3dec->bit_stream,1)))
223 /* Get langauge code */
224 p_ac3dec->bsi.langcod = GetBits (&p_ac3dec->bit_stream,8);
225 p_ac3dec->total_bits_read += 8;
228 /* Does audio production info exist? */
229 if ((p_ac3dec->bsi.audprodie = GetBits (&p_ac3dec->bit_stream,1)))
232 p_ac3dec->bsi.mixlevel = GetBits (&p_ac3dec->bit_stream,5);
235 p_ac3dec->bsi.roomtyp = GetBits (&p_ac3dec->bit_stream,2);
236 p_ac3dec->total_bits_read += 7;
239 /* If we're in dual mono mode then get some extra info */
240 if (p_ac3dec->bsi.acmod == 0)
242 /* Get the dialogue normalization level two */
243 p_ac3dec->bsi.dialnorm2 = GetBits (&p_ac3dec->bit_stream,5);
245 /* Does compression gain two exist? */
246 if ((p_ac3dec->bsi.compr2e = GetBits (&p_ac3dec->bit_stream,1)))
248 /* Get compression gain two */
249 p_ac3dec->bsi.compr2 = GetBits (&p_ac3dec->bit_stream,8);
250 p_ac3dec->total_bits_read += 8;
253 /* Does language code two exist? */
254 if ((p_ac3dec->bsi.langcod2e = GetBits (&p_ac3dec->bit_stream,1)))
256 /* Get langauge code two */
257 p_ac3dec->bsi.langcod2 = GetBits (&p_ac3dec->bit_stream,8);
258 p_ac3dec->total_bits_read += 8;
261 /* Does audio production info two exist? */
262 if ((p_ac3dec->bsi.audprodi2e = GetBits (&p_ac3dec->bit_stream,1)))
264 /* Get mix level two */
265 p_ac3dec->bsi.mixlevel2 = GetBits (&p_ac3dec->bit_stream,5);
267 /* Get room type two */
268 p_ac3dec->bsi.roomtyp2 = GetBits (&p_ac3dec->bit_stream,2);
269 p_ac3dec->total_bits_read += 7;
271 p_ac3dec->total_bits_read += 8;
274 /* Get the copyright bit */
275 p_ac3dec->bsi.copyrightb = GetBits (&p_ac3dec->bit_stream,1);
277 /* Get the original bit */
278 p_ac3dec->bsi.origbs = GetBits (&p_ac3dec->bit_stream,1);
280 /* Does timecode one exist? */
281 if ((p_ac3dec->bsi.timecod1e = GetBits (&p_ac3dec->bit_stream,1)))
283 p_ac3dec->bsi.timecod1 = GetBits (&p_ac3dec->bit_stream,14);
284 p_ac3dec->total_bits_read += 14;
287 /* Does timecode two exist? */
288 if ((p_ac3dec->bsi.timecod2e = GetBits (&p_ac3dec->bit_stream,1)))
290 p_ac3dec->bsi.timecod2 = GetBits (&p_ac3dec->bit_stream,14);
291 p_ac3dec->total_bits_read += 14;
294 /* Does addition info exist? */
295 if ((p_ac3dec->bsi.addbsie = GetBits (&p_ac3dec->bit_stream,1)))
299 /* Get how much info is there */
300 p_ac3dec->bsi.addbsil = GetBits (&p_ac3dec->bit_stream,6);
302 /* Get the additional info */
303 for (i=0;i<(p_ac3dec->bsi.addbsil + 1);i++)
305 p_ac3dec->bsi.addbsi[i] = GetBits (&p_ac3dec->bit_stream,8);
307 p_ac3dec->total_bits_read += 6 + 8 * (p_ac3dec->bsi.addbsil + 1);
309 p_ac3dec->total_bits_read += 25;
312 parse_bsi_stats (p_ac3dec);
318 /* More pain inducing parsing */
319 int parse_audblk (ac3dec_t * p_ac3dec, int blknum)
323 for (i=0; i < p_ac3dec->bsi.nfchans; i++)
325 /* Is this channel an interleaved 256 + 256 block ? */
326 p_ac3dec->audblk.blksw[i] = GetBits (&p_ac3dec->bit_stream,1);
329 for (i=0; i < p_ac3dec->bsi.nfchans; i++)
331 /* Should we dither this channel? */
332 p_ac3dec->audblk.dithflag[i] = GetBits (&p_ac3dec->bit_stream,1);
335 /* Does dynamic range control exist? */
336 if ((p_ac3dec->audblk.dynrnge = GetBits (&p_ac3dec->bit_stream,1)))
338 /* Get dynamic range info */
339 p_ac3dec->audblk.dynrng = GetBits (&p_ac3dec->bit_stream,8);
340 p_ac3dec->total_bits_read += 8;
343 /* If we're in dual mono mode then get the second channel DR info */
344 if (p_ac3dec->bsi.acmod == 0)
346 /* Does dynamic range control two exist? */
347 if ((p_ac3dec->audblk.dynrng2e = GetBits (&p_ac3dec->bit_stream,1)))
349 /* Get dynamic range info */
350 p_ac3dec->audblk.dynrng2 = GetBits (&p_ac3dec->bit_stream,8);
351 p_ac3dec->total_bits_read += 8;
353 p_ac3dec->total_bits_read += 1;
356 /* Does coupling strategy exist? */
357 p_ac3dec->audblk.cplstre = GetBits (&p_ac3dec->bit_stream,1);
358 p_ac3dec->total_bits_read += 2 + 2 * p_ac3dec->bsi.nfchans;
360 if ((!blknum) && (!p_ac3dec->audblk.cplstre))
365 if (p_ac3dec->audblk.cplstre)
367 /* Is coupling turned on? */
368 if ((p_ac3dec->audblk.cplinu = GetBits (&p_ac3dec->bit_stream,1)))
370 int nb_coupled_channels;
372 nb_coupled_channels = 0;
373 for (i=0; i < p_ac3dec->bsi.nfchans; i++)
375 p_ac3dec->audblk.chincpl[i] = GetBits (&p_ac3dec->bit_stream,1);
376 if (p_ac3dec->audblk.chincpl[i])
378 nb_coupled_channels++;
381 p_ac3dec->total_bits_read += p_ac3dec->bsi.nfchans;
383 if (nb_coupled_channels < 2)
388 if (p_ac3dec->bsi.acmod == 0x2)
390 p_ac3dec->audblk.phsflginu = GetBits (&p_ac3dec->bit_stream,1);
391 p_ac3dec->total_bits_read += 1;
393 p_ac3dec->audblk.cplbegf = GetBits (&p_ac3dec->bit_stream,4);
394 p_ac3dec->audblk.cplendf = GetBits (&p_ac3dec->bit_stream,4);
395 p_ac3dec->total_bits_read += 8;
397 if (p_ac3dec->audblk.cplbegf > p_ac3dec->audblk.cplendf + 2)
402 p_ac3dec->audblk.ncplsubnd = (p_ac3dec->audblk.cplendf + 2) - p_ac3dec->audblk.cplbegf + 1;
404 /* Calculate the start and end bins of the coupling channel */
405 p_ac3dec->audblk.cplstrtmant = (p_ac3dec->audblk.cplbegf * 12) + 37 ;
406 p_ac3dec->audblk.cplendmant = ((p_ac3dec->audblk.cplendf + 3) * 12) + 37;
408 /* The number of combined subbands is ncplsubnd minus each combined
410 p_ac3dec->audblk.ncplbnd = p_ac3dec->audblk.ncplsubnd;
412 for (i=1; i< p_ac3dec->audblk.ncplsubnd; i++)
414 p_ac3dec->audblk.cplbndstrc[i] = GetBits (&p_ac3dec->bit_stream,1);
415 p_ac3dec->audblk.ncplbnd -= p_ac3dec->audblk.cplbndstrc[i];
417 p_ac3dec->total_bits_read += p_ac3dec->audblk.ncplsubnd - 1;
419 p_ac3dec->total_bits_read += 1;
422 if (p_ac3dec->audblk.cplinu)
424 /* Loop through all the channels and get their coupling co-ords */
425 for (i=0; i < p_ac3dec->bsi.nfchans;i++)
427 if (!p_ac3dec->audblk.chincpl[i])
432 /* Is there new coupling co-ordinate info? */
433 p_ac3dec->audblk.cplcoe[i] = GetBits (&p_ac3dec->bit_stream,1);
435 if ((!blknum) && (!p_ac3dec->audblk.cplcoe[i]))
440 if (p_ac3dec->audblk.cplcoe[i])
442 p_ac3dec->audblk.mstrcplco[i] = GetBits (&p_ac3dec->bit_stream,2);
443 p_ac3dec->total_bits_read += 2;
444 for (j=0;j < p_ac3dec->audblk.ncplbnd; j++)
446 p_ac3dec->audblk.cplcoexp[i][j] = GetBits (&p_ac3dec->bit_stream,4);
447 p_ac3dec->audblk.cplcomant[i][j] = GetBits (&p_ac3dec->bit_stream,4);
449 p_ac3dec->total_bits_read += 8 * p_ac3dec->audblk.ncplbnd;
452 p_ac3dec->total_bits_read += p_ac3dec->bsi.nfchans;
454 /* If we're in dual mono mode, there's going to be some phase info */
455 if ((p_ac3dec->bsi.acmod == 0x2) && p_ac3dec->audblk.phsflginu &&
456 (p_ac3dec->audblk.cplcoe[0] || p_ac3dec->audblk.cplcoe[1]))
458 for (j=0; j < p_ac3dec->audblk.ncplbnd; j++)
460 p_ac3dec->audblk.phsflg[j] = GetBits (&p_ac3dec->bit_stream,1);
462 p_ac3dec->total_bits_read += p_ac3dec->audblk.ncplbnd;
467 /* If we're in dual mono mode, there may be a rematrix strategy */
468 if (p_ac3dec->bsi.acmod == 0x2)
470 p_ac3dec->audblk.rematstr = GetBits (&p_ac3dec->bit_stream,1);
471 p_ac3dec->total_bits_read += 1;
473 if ((!blknum) && (!p_ac3dec->audblk.rematstr))
478 if (p_ac3dec->audblk.rematstr)
480 if (p_ac3dec->audblk.cplinu == 0)
482 for (i = 0; i < 4; i++)
484 p_ac3dec->audblk.rematflg[i] = GetBits (&p_ac3dec->bit_stream,1);
486 p_ac3dec->total_bits_read += 4;
488 if ((p_ac3dec->audblk.cplbegf > 2) && p_ac3dec->audblk.cplinu)
490 for (i = 0; i < 4; i++)
492 p_ac3dec->audblk.rematflg[i] = GetBits (&p_ac3dec->bit_stream,1);
494 p_ac3dec->total_bits_read += 4;
496 if ((p_ac3dec->audblk.cplbegf <= 2) && p_ac3dec->audblk.cplinu)
498 for (i = 0; i < 3; i++)
500 p_ac3dec->audblk.rematflg[i] = GetBits (&p_ac3dec->bit_stream,1);
502 p_ac3dec->total_bits_read += 3;
504 if ((p_ac3dec->audblk.cplbegf == 0) && p_ac3dec->audblk.cplinu)
506 for (i = 0; i < 2; i++)
508 p_ac3dec->audblk.rematflg[i] = GetBits (&p_ac3dec->bit_stream,1);
510 p_ac3dec->total_bits_read += 2;
515 if (p_ac3dec->audblk.cplinu)
517 /* Get the coupling channel exponent strategy */
518 p_ac3dec->audblk.cplexpstr = GetBits (&p_ac3dec->bit_stream,2);
519 p_ac3dec->total_bits_read += 2;
521 if ((!blknum) && (p_ac3dec->audblk.cplexpstr == EXP_REUSE))
526 if (p_ac3dec->audblk.cplexpstr==0)
528 p_ac3dec->audblk.ncplgrps = 0;
532 p_ac3dec->audblk.ncplgrps = (p_ac3dec->audblk.cplendmant - p_ac3dec->audblk.cplstrtmant) /
533 (3 << (p_ac3dec->audblk.cplexpstr-1));
538 for (i = 0; i < p_ac3dec->bsi.nfchans; i++)
540 p_ac3dec->audblk.chexpstr[i] = GetBits (&p_ac3dec->bit_stream,2);
541 p_ac3dec->total_bits_read += 2;
543 if ((!blknum) && (p_ac3dec->audblk.chexpstr[i] == EXP_REUSE))
549 /* Get the exponent strategy for lfe channel */
550 if (p_ac3dec->bsi.lfeon)
552 p_ac3dec->audblk.lfeexpstr = GetBits (&p_ac3dec->bit_stream,1);
553 p_ac3dec->total_bits_read += 1;
555 if ((!blknum) && (p_ac3dec->audblk.lfeexpstr == EXP_REUSE))
561 /* Determine the bandwidths of all the fbw channels */
562 for (i = 0; i < p_ac3dec->bsi.nfchans; i++)
566 if (p_ac3dec->audblk.chexpstr[i] != EXP_REUSE)
568 if (p_ac3dec->audblk.cplinu && p_ac3dec->audblk.chincpl[i])
570 p_ac3dec->audblk.endmant[i] = p_ac3dec->audblk.cplstrtmant;
574 p_ac3dec->audblk.chbwcod[i] = GetBits (&p_ac3dec->bit_stream,6);
575 p_ac3dec->total_bits_read += 6;
577 if (p_ac3dec->audblk.chbwcod[i] > 60)
582 p_ac3dec->audblk.endmant[i] = ((p_ac3dec->audblk.chbwcod[i] + 12) * 3) + 37;
585 /* Calculate the number of exponent groups to fetch */
586 grp_size = 3 * (1 << (p_ac3dec->audblk.chexpstr[i] - 1));
587 p_ac3dec->audblk.nchgrps[i] = (p_ac3dec->audblk.endmant[i] - 1 + (grp_size - 3)) / grp_size;
591 /* Get the coupling exponents if they exist */
592 if (p_ac3dec->audblk.cplinu && (p_ac3dec->audblk.cplexpstr != EXP_REUSE))
594 p_ac3dec->audblk.cplabsexp = GetBits (&p_ac3dec->bit_stream,4);
595 p_ac3dec->total_bits_read += 4;
596 for (i=0; i< p_ac3dec->audblk.ncplgrps;i++)
598 p_ac3dec->audblk.cplexps[i] = GetBits (&p_ac3dec->bit_stream,7);
599 p_ac3dec->total_bits_read += 7;
601 if (p_ac3dec->audblk.cplexps[i] >= 125)
608 /* Get the fwb channel exponents */
609 for (i=0; i < p_ac3dec->bsi.nfchans; i++)
611 if (p_ac3dec->audblk.chexpstr[i] != EXP_REUSE)
613 p_ac3dec->audblk.exps[i][0] = GetBits (&p_ac3dec->bit_stream,4);
614 p_ac3dec->total_bits_read += 4;
615 for (j=1; j<=p_ac3dec->audblk.nchgrps[i];j++)
617 p_ac3dec->audblk.exps[i][j] = GetBits (&p_ac3dec->bit_stream,7);
618 p_ac3dec->total_bits_read += 7;
619 if (p_ac3dec->audblk.exps[i][j] >= 125)
624 p_ac3dec->audblk.gainrng[i] = GetBits (&p_ac3dec->bit_stream,2);
625 p_ac3dec->total_bits_read += 2;
629 /* Get the lfe channel exponents */
630 if (p_ac3dec->bsi.lfeon && (p_ac3dec->audblk.lfeexpstr != EXP_REUSE))
632 p_ac3dec->audblk.lfeexps[0] = GetBits (&p_ac3dec->bit_stream,4);
633 p_ac3dec->audblk.lfeexps[1] = GetBits (&p_ac3dec->bit_stream,7);
634 p_ac3dec->total_bits_read += 11;
635 if (p_ac3dec->audblk.lfeexps[1] >= 125)
639 p_ac3dec->audblk.lfeexps[2] = GetBits (&p_ac3dec->bit_stream,7);
640 p_ac3dec->total_bits_read += 7;
641 if (p_ac3dec->audblk.lfeexps[2] >= 125)
647 /* Get the parametric bit allocation parameters */
648 p_ac3dec->audblk.baie = GetBits (&p_ac3dec->bit_stream,1);
649 p_ac3dec->total_bits_read += 1;
651 if ((!blknum) && (!p_ac3dec->audblk.baie))
656 if (p_ac3dec->audblk.baie)
658 p_ac3dec->audblk.sdcycod = GetBits (&p_ac3dec->bit_stream,2);
659 p_ac3dec->audblk.fdcycod = GetBits (&p_ac3dec->bit_stream,2);
660 p_ac3dec->audblk.sgaincod = GetBits (&p_ac3dec->bit_stream,2);
661 p_ac3dec->audblk.dbpbcod = GetBits (&p_ac3dec->bit_stream,2);
662 p_ac3dec->audblk.floorcod = GetBits (&p_ac3dec->bit_stream,3);
663 p_ac3dec->total_bits_read += 11;
666 /* Get the SNR off set info if it exists */
667 p_ac3dec->audblk.snroffste = GetBits (&p_ac3dec->bit_stream,1);
668 if ((!blknum) && (!p_ac3dec->audblk.snroffste))
673 if (p_ac3dec->audblk.snroffste)
675 p_ac3dec->audblk.csnroffst = GetBits (&p_ac3dec->bit_stream,6);
676 p_ac3dec->total_bits_read += 6;
678 if (p_ac3dec->audblk.cplinu)
680 p_ac3dec->audblk.cplfsnroffst = GetBits (&p_ac3dec->bit_stream,4);
681 p_ac3dec->audblk.cplfgaincod = GetBits (&p_ac3dec->bit_stream,3);
682 p_ac3dec->total_bits_read += 7;
685 for (i = 0;i < p_ac3dec->bsi.nfchans; i++)
687 p_ac3dec->audblk.fsnroffst[i] = GetBits (&p_ac3dec->bit_stream,4);
688 p_ac3dec->audblk.fgaincod[i] = GetBits (&p_ac3dec->bit_stream,3);
690 p_ac3dec->total_bits_read += 7 * p_ac3dec->bsi.nfchans;
691 if (p_ac3dec->bsi.lfeon)
693 p_ac3dec->audblk.lfefsnroffst = GetBits (&p_ac3dec->bit_stream,4);
694 p_ac3dec->audblk.lfefgaincod = GetBits (&p_ac3dec->bit_stream,3);
695 p_ac3dec->total_bits_read += 7;
699 /* Get coupling leakage info if it exists */
700 if (p_ac3dec->audblk.cplinu)
702 p_ac3dec->audblk.cplleake = GetBits (&p_ac3dec->bit_stream,1);
703 p_ac3dec->total_bits_read += 1;
704 if ((!blknum) && (!p_ac3dec->audblk.cplleake))
709 if (p_ac3dec->audblk.cplleake)
711 p_ac3dec->audblk.cplfleak = GetBits (&p_ac3dec->bit_stream,3);
712 p_ac3dec->audblk.cplsleak = GetBits (&p_ac3dec->bit_stream,3);
713 p_ac3dec->total_bits_read += 6;
717 /* Get the delta bit alloaction info */
718 p_ac3dec->audblk.deltbaie = GetBits (&p_ac3dec->bit_stream,1);
719 p_ac3dec->total_bits_read += 1;
721 if (p_ac3dec->audblk.deltbaie)
723 if (p_ac3dec->audblk.cplinu)
725 p_ac3dec->audblk.cpldeltbae = GetBits (&p_ac3dec->bit_stream,2);
726 p_ac3dec->total_bits_read += 2;
727 if (p_ac3dec->audblk.cpldeltbae == 3)
733 for (i = 0;i < p_ac3dec->bsi.nfchans; i++)
735 p_ac3dec->audblk.deltbae[i] = GetBits (&p_ac3dec->bit_stream,2);
736 p_ac3dec->total_bits_read += 2;
737 if (p_ac3dec->audblk.deltbae[i] == 3)
743 if (p_ac3dec->audblk.cplinu && (p_ac3dec->audblk.cpldeltbae == DELTA_BIT_NEW))
745 p_ac3dec->audblk.cpldeltnseg = GetBits (&p_ac3dec->bit_stream,3);
746 for (i = 0;i < p_ac3dec->audblk.cpldeltnseg + 1; i++)
748 p_ac3dec->audblk.cpldeltoffst[i] = GetBits (&p_ac3dec->bit_stream,5);
749 p_ac3dec->audblk.cpldeltlen[i] = GetBits (&p_ac3dec->bit_stream,4);
750 p_ac3dec->audblk.cpldeltba[i] = GetBits (&p_ac3dec->bit_stream,3);
752 p_ac3dec->total_bits_read += 12 * (p_ac3dec->audblk.cpldeltnseg + 1) + 3;
755 for (i = 0; i < p_ac3dec->bsi.nfchans; i++)
757 if (p_ac3dec->audblk.deltbae[i] == DELTA_BIT_NEW)
759 p_ac3dec->audblk.deltnseg[i] = GetBits (&p_ac3dec->bit_stream,3);
760 // if (p_ac3dec->audblk.deltnseg[i] >= 8)
761 // fprintf (stderr, "parse debug: p_ac3dec->audblk.deltnseg[%i] == %i\n", i, p_ac3dec->audblk.deltnseg[i]);
762 for (j = 0; j < p_ac3dec->audblk.deltnseg[i] + 1; j++)
764 p_ac3dec->audblk.deltoffst[i][j] = GetBits (&p_ac3dec->bit_stream,5);
765 p_ac3dec->audblk.deltlen[i][j] = GetBits (&p_ac3dec->bit_stream,4);
766 p_ac3dec->audblk.deltba[i][j] = GetBits (&p_ac3dec->bit_stream,3);
768 p_ac3dec->total_bits_read += 12 * (p_ac3dec->audblk.deltnseg[i] + 1) + 3;
773 /* Check to see if there's any dummy info to get */
774 p_ac3dec->audblk.skiple = GetBits (&p_ac3dec->bit_stream,1);
775 p_ac3dec->total_bits_read += 1;
777 if (p_ac3dec->audblk.skiple)
779 p_ac3dec->audblk.skipl = GetBits (&p_ac3dec->bit_stream,9);
781 for (i = 0; i < p_ac3dec->audblk.skipl ; i++)
783 GetBits (&p_ac3dec->bit_stream,8);
785 p_ac3dec->total_bits_read += 8 * p_ac3dec->audblk.skipl + 9;
789 parse_audblk_stats(p_ac3dec);
795 void parse_auxdata (ac3dec_t * p_ac3dec)
800 skip_length = (p_ac3dec->syncinfo.frame_size * 16) - p_ac3dec->total_bits_read - 17 - 1;
802 for (i = 0; i < skip_length; i++)
804 RemoveBits (&p_ac3dec->bit_stream,1);
807 /* get the auxdata exists bit */
808 RemoveBits (&p_ac3dec->bit_stream,1);
810 /* Skip the CRC reserved bit */
811 RemoveBits (&p_ac3dec->bit_stream,1);
814 RemoveBits (&p_ac3dec->bit_stream,16);
818 static void parse_bsi_stats (ac3dec_t * p_ac3dec) /* Some stats */
825 static const char *service_ids[8] =
831 static const struct mixlev_s cmixlev_tbl[4] =
833 {0.707, "(-3.0 dB)"}, {0.595, "(-4.5 dB)"},
834 {0.500, "(-6.0 dB)"}, {1.0, "Invalid"}
836 static const struct mixlev_s smixlev_tbl[4] =
838 {0.707, "(-3.0 dB)"}, {0.500, "(-6.0 dB)"},
839 { 0.0, "off "}, { 1.0, "Invalid"}
847 /* if ((p_ac3dec->bsi.acmod & 0x1) && (p_ac3dec->bsi.acmod != 0x1))
848 printf("CentreMixLevel %s ",cmixlev_tbl[p_ac3dec->bsi.cmixlev].desc);
849 if (p_ac3dec->bsi.acmod & 0x4)
850 printf("SurMixLevel %s",smixlev_tbl[p_ac3dec->bsi.cmixlev].desc);
852 intf_Msg ( "(ac3dec_parsebsi) %s %d.%d Mode",
853 service_ids[p_ac3dec->bsi.bsmod],
854 p_ac3dec->bsi.nfchans,p_ac3dec->bsi.lfeon);
862 static void parse_audblk_stats (ac3dec_t * p_ac3dec)
864 char *exp_strat_tbl[4] = {"R ","D15 ","D25 ","D45 "};
867 intf_ErrMsg ("(ac3dec_parseaudblk) ");
868 intf_ErrMsg ("%s ",p_ac3dec->audblk.cplinu ? "cpl on" : "cpl off");
869 intf_ErrMsg ("%s ",p_ac3dec->audblk.baie? "bai" : " ");
870 intf_ErrMsg ("%s ",p_ac3dec->audblk.snroffste? "snroffst" : " ");
871 intf_ErrMsg ("%s ",p_ac3dec->audblk.deltbaie? "deltba" : " ");
872 intf_ErrMsg ("%s ",p_ac3dec->audblk.phsflginu? "phsflg" : " ");
873 intf_ErrMsg ("(%s %s %s %s %s) ",exp_strat_tbl[p_ac3dec->audblk.chexpstr[0]],
874 exp_strat_tbl[p_ac3dec->audblk.chexpstr[1]],exp_strat_tbl[p_ac3dec->audblk.chexpstr[2]],
875 exp_strat_tbl[p_ac3dec->audblk.chexpstr[3]],exp_strat_tbl[p_ac3dec->audblk.chexpstr[4]]);
877 for(i=0;i<p_ac3dec->bsi.nfchans;i++)
878 intf_ErrMsg ("%1d",p_ac3dec->audblk.blksw[i]);