1 /*****************************************************************************
2 * ac3_parse.c: ac3 parsing procedures
3 *****************************************************************************
4 * Copyright (C) 1999-2001 VideoLAN
5 * $Id: ac3_parse.c,v 1.9 2002/06/01 12:31:58 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 *****************************************************************************/
29 #include <string.h> /* memset() */
32 #include <vlc/decoder.h>
34 #include "ac3_imdct.h"
35 #include "ac3_downmix.h"
38 #include "ac3_internal.h" /* EXP_REUSE */
41 static const u16 nfchans[] = { 2, 1, 2, 3, 3, 4, 4, 5 };
49 static const struct frmsize_s frmsizecod_tbl[] =
51 { 32 ,{64 ,69 ,96 } },
52 { 32 ,{64 ,70 ,96 } },
53 { 40 ,{80 ,87 ,120 } },
54 { 40 ,{80 ,88 ,120 } },
55 { 48 ,{96 ,104 ,144 } },
56 { 48 ,{96 ,105 ,144 } },
57 { 56 ,{112 ,121 ,168 } },
58 { 56 ,{112 ,122 ,168 } },
59 { 64 ,{128 ,139 ,192 } },
60 { 64 ,{128 ,140 ,192 } },
61 { 80 ,{160 ,174 ,240 } },
62 { 80 ,{160 ,175 ,240 } },
63 { 96 ,{192 ,208 ,288 } },
64 { 96 ,{192 ,209 ,288 } },
65 { 112 ,{224 ,243 ,336 } },
66 { 112 ,{224 ,244 ,336 } },
67 { 128 ,{256 ,278 ,384 } },
68 { 128 ,{256 ,279 ,384 } },
69 { 160 ,{320 ,348 ,480 } },
70 { 160 ,{320 ,349 ,480 } },
71 { 192 ,{384 ,417 ,576 } },
72 { 192 ,{384 ,418 ,576 } },
73 { 224 ,{448 ,487 ,672 } },
74 { 224 ,{448 ,488 ,672 } },
75 { 256 ,{512 ,557 ,768 } },
76 { 256 ,{512 ,558 ,768 } },
77 { 320 ,{640 ,696 ,960 } },
78 { 320 ,{640 ,697 ,960 } },
79 { 384 ,{768 ,835 ,1152 } },
80 { 384 ,{768 ,836 ,1152 } },
81 { 448 ,{896 ,975 ,1344 } },
82 { 448 ,{896 ,976 ,1344 } },
83 { 512 ,{1024 ,1114 ,1536 } },
84 { 512 ,{1024 ,1115 ,1536 } },
85 { 576 ,{1152 ,1253 ,1728 } },
86 { 576 ,{1152 ,1254 ,1728 } },
87 { 640 ,{1280 ,1393 ,1920 } },
88 { 640 ,{1280 ,1394 ,1920 } }};
90 static const int fscod_tbl[] = {48000, 44100, 32000};
92 /* Some internal functions */
93 static void parse_bsi_stats (ac3dec_t * p_ac3dec);
94 static void parse_audblk_stats (ac3dec_t * p_ac3dec);
96 /* Parse a syncinfo structure */
97 int ac3_sync_frame (ac3dec_t * p_ac3dec, ac3_sync_info_t * p_sync_info)
99 p_ac3dec->total_bits_read = 0;
100 p_ac3dec->i_available = 0;
102 /* sync word - should be 0x0b77 */
103 RealignBits(&p_ac3dec->bit_stream);
104 while( (ShowBits (&p_ac3dec->bit_stream,16)) != 0x0b77 &&
105 (!p_ac3dec->p_fifo->b_die) && (!p_ac3dec->p_fifo->b_error))
107 RemoveBits (&p_ac3dec->bit_stream,8);
108 p_ac3dec->total_bits_read += 8;
110 RemoveBits (&p_ac3dec->bit_stream,16);
111 p_ac3dec->total_bits_read += 16;
114 /* Get crc1 - we don't actually use this data though */
115 GetBits (&p_ac3dec->bit_stream,16);
117 /* Get the sampling rate */
118 p_ac3dec->syncinfo.fscod = GetBits (&p_ac3dec->bit_stream,2);
120 if (p_ac3dec->syncinfo.fscod >= 3)
122 p_ac3dec->total_bits_read += 34;
126 /* Get the frame size code */
127 p_ac3dec->syncinfo.frmsizecod = GetBits (&p_ac3dec->bit_stream,6);
128 p_ac3dec->total_bits_read += 40;
130 if (p_ac3dec->syncinfo.frmsizecod >= 38)
135 p_sync_info->bit_rate = frmsizecod_tbl[p_ac3dec->syncinfo.frmsizecod].bit_rate;
137 p_ac3dec->syncinfo.frame_size = frmsizecod_tbl[p_ac3dec->syncinfo.frmsizecod].frm_size[p_ac3dec->syncinfo.fscod];
138 p_sync_info->frame_size = 2 * p_ac3dec->syncinfo.frame_size;
140 p_sync_info->sample_rate = fscod_tbl[p_ac3dec->syncinfo.fscod];
146 * This routine fills a bsi struct from the AC3 stream
148 int parse_bsi (ac3dec_t * p_ac3dec)
150 /* Check the AC-3 version number */
151 p_ac3dec->bsi.bsid = GetBits (&p_ac3dec->bit_stream,5);
153 if (p_ac3dec->bsi.bsid > 8)
158 /* Get the audio service provided by the stream */
159 p_ac3dec->bsi.bsmod = GetBits (&p_ac3dec->bit_stream,3);
161 /* Get the audio coding mode (ie how many channels)*/
162 p_ac3dec->bsi.acmod = GetBits (&p_ac3dec->bit_stream,3);
164 /* Predecode the number of full bandwidth channels as we use this
166 p_ac3dec->bsi.nfchans = nfchans[p_ac3dec->bsi.acmod];
168 /* If it is in use, get the centre channel mix level */
169 if ((p_ac3dec->bsi.acmod & 0x1) && (p_ac3dec->bsi.acmod != 0x1))
171 p_ac3dec->bsi.cmixlev = GetBits (&p_ac3dec->bit_stream,2);
172 p_ac3dec->total_bits_read += 2;
175 /* If it is in use, get the surround channel mix level */
176 if (p_ac3dec->bsi.acmod & 0x4)
178 p_ac3dec->bsi.surmixlev = GetBits (&p_ac3dec->bit_stream,2);
179 p_ac3dec->total_bits_read += 2;
182 /* Get the dolby surround mode if in 2/0 mode */
183 if (p_ac3dec->bsi.acmod == 0x2)
185 p_ac3dec->bsi.dsurmod = GetBits (&p_ac3dec->bit_stream,2);
186 p_ac3dec->total_bits_read += 2;
189 /* Is the low frequency effects channel on? */
190 p_ac3dec->bsi.lfeon = GetBits (&p_ac3dec->bit_stream,1);
192 /* Get the dialogue normalization level */
193 p_ac3dec->bsi.dialnorm = GetBits (&p_ac3dec->bit_stream,5);
195 /* Does compression gain exist? */
196 if ((p_ac3dec->bsi.compre = GetBits (&p_ac3dec->bit_stream,1)))
198 /* Get compression gain */
199 p_ac3dec->bsi.compr = GetBits (&p_ac3dec->bit_stream,8);
200 p_ac3dec->total_bits_read += 8;
203 /* Does language code exist? */
204 if ((p_ac3dec->bsi.langcode = GetBits (&p_ac3dec->bit_stream,1)))
206 /* Get langauge code */
207 p_ac3dec->bsi.langcod = GetBits (&p_ac3dec->bit_stream,8);
208 p_ac3dec->total_bits_read += 8;
211 /* Does audio production info exist? */
212 if ((p_ac3dec->bsi.audprodie = GetBits (&p_ac3dec->bit_stream,1)))
215 p_ac3dec->bsi.mixlevel = GetBits (&p_ac3dec->bit_stream,5);
218 p_ac3dec->bsi.roomtyp = GetBits (&p_ac3dec->bit_stream,2);
219 p_ac3dec->total_bits_read += 7;
222 /* If we're in dual mono mode then get some extra info */
223 if (p_ac3dec->bsi.acmod == 0)
225 /* Get the dialogue normalization level two */
226 p_ac3dec->bsi.dialnorm2 = GetBits (&p_ac3dec->bit_stream,5);
228 /* Does compression gain two exist? */
229 if ((p_ac3dec->bsi.compr2e = GetBits (&p_ac3dec->bit_stream,1)))
231 /* Get compression gain two */
232 p_ac3dec->bsi.compr2 = GetBits (&p_ac3dec->bit_stream,8);
233 p_ac3dec->total_bits_read += 8;
236 /* Does language code two exist? */
237 if ((p_ac3dec->bsi.langcod2e = GetBits (&p_ac3dec->bit_stream,1)))
239 /* Get langauge code two */
240 p_ac3dec->bsi.langcod2 = GetBits (&p_ac3dec->bit_stream,8);
241 p_ac3dec->total_bits_read += 8;
244 /* Does audio production info two exist? */
245 if ((p_ac3dec->bsi.audprodi2e = GetBits (&p_ac3dec->bit_stream,1)))
247 /* Get mix level two */
248 p_ac3dec->bsi.mixlevel2 = GetBits (&p_ac3dec->bit_stream,5);
250 /* Get room type two */
251 p_ac3dec->bsi.roomtyp2 = GetBits (&p_ac3dec->bit_stream,2);
252 p_ac3dec->total_bits_read += 7;
254 p_ac3dec->total_bits_read += 8;
257 /* Get the copyright bit */
258 p_ac3dec->bsi.copyrightb = GetBits (&p_ac3dec->bit_stream,1);
260 /* Get the original bit */
261 p_ac3dec->bsi.origbs = GetBits (&p_ac3dec->bit_stream,1);
263 /* Does timecode one exist? */
264 if ((p_ac3dec->bsi.timecod1e = GetBits (&p_ac3dec->bit_stream,1)))
266 p_ac3dec->bsi.timecod1 = GetBits (&p_ac3dec->bit_stream,14);
267 p_ac3dec->total_bits_read += 14;
270 /* Does timecode two exist? */
271 if ((p_ac3dec->bsi.timecod2e = GetBits (&p_ac3dec->bit_stream,1)))
273 p_ac3dec->bsi.timecod2 = GetBits (&p_ac3dec->bit_stream,14);
274 p_ac3dec->total_bits_read += 14;
277 /* Does addition info exist? */
278 if ((p_ac3dec->bsi.addbsie = GetBits (&p_ac3dec->bit_stream,1)))
282 /* Get how much info is there */
283 p_ac3dec->bsi.addbsil = GetBits (&p_ac3dec->bit_stream,6);
285 /* Get the additional info */
286 for (i=0;i<(p_ac3dec->bsi.addbsil + 1);i++)
288 p_ac3dec->bsi.addbsi[i] = GetBits (&p_ac3dec->bit_stream,8);
290 p_ac3dec->total_bits_read += 6 + 8 * (p_ac3dec->bsi.addbsil + 1);
292 p_ac3dec->total_bits_read += 25;
294 parse_bsi_stats (p_ac3dec);
299 /* More pain inducing parsing */
300 int parse_audblk (ac3dec_t * p_ac3dec, int blknum)
304 for (i=0; i < p_ac3dec->bsi.nfchans; i++)
306 /* Is this channel an interleaved 256 + 256 block ? */
307 p_ac3dec->audblk.blksw[i] = GetBits (&p_ac3dec->bit_stream,1);
310 for (i=0; i < p_ac3dec->bsi.nfchans; i++)
312 /* Should we dither this channel? */
313 p_ac3dec->audblk.dithflag[i] = GetBits (&p_ac3dec->bit_stream,1);
316 /* Does dynamic range control exist? */
317 if ((p_ac3dec->audblk.dynrnge = GetBits (&p_ac3dec->bit_stream,1)))
319 /* Get dynamic range info */
320 p_ac3dec->audblk.dynrng = GetBits (&p_ac3dec->bit_stream,8);
321 p_ac3dec->total_bits_read += 8;
324 /* If we're in dual mono mode then get the second channel DR info */
325 if (p_ac3dec->bsi.acmod == 0)
327 /* Does dynamic range control two exist? */
328 if ((p_ac3dec->audblk.dynrng2e = GetBits (&p_ac3dec->bit_stream,1)))
330 /* Get dynamic range info */
331 p_ac3dec->audblk.dynrng2 = GetBits (&p_ac3dec->bit_stream,8);
332 p_ac3dec->total_bits_read += 8;
334 p_ac3dec->total_bits_read += 1;
337 /* Does coupling strategy exist? */
338 p_ac3dec->audblk.cplstre = GetBits (&p_ac3dec->bit_stream,1);
339 p_ac3dec->total_bits_read += 2 + 2 * p_ac3dec->bsi.nfchans;
341 if ((!blknum) && (!p_ac3dec->audblk.cplstre))
346 if (p_ac3dec->audblk.cplstre)
348 /* Is coupling turned on? */
349 if ((p_ac3dec->audblk.cplinu = GetBits (&p_ac3dec->bit_stream,1)))
351 int nb_coupled_channels;
353 nb_coupled_channels = 0;
354 for (i=0; i < p_ac3dec->bsi.nfchans; i++)
356 p_ac3dec->audblk.chincpl[i] = GetBits (&p_ac3dec->bit_stream,1);
357 if (p_ac3dec->audblk.chincpl[i])
359 nb_coupled_channels++;
362 p_ac3dec->total_bits_read += p_ac3dec->bsi.nfchans;
364 if (nb_coupled_channels < 2)
369 if (p_ac3dec->bsi.acmod == 0x2)
371 p_ac3dec->audblk.phsflginu = GetBits (&p_ac3dec->bit_stream,1);
372 p_ac3dec->total_bits_read += 1;
374 p_ac3dec->audblk.cplbegf = GetBits (&p_ac3dec->bit_stream,4);
375 p_ac3dec->audblk.cplendf = GetBits (&p_ac3dec->bit_stream,4);
376 p_ac3dec->total_bits_read += 8;
378 if (p_ac3dec->audblk.cplbegf > p_ac3dec->audblk.cplendf + 2)
383 p_ac3dec->audblk.ncplsubnd = (p_ac3dec->audblk.cplendf + 2) - p_ac3dec->audblk.cplbegf + 1;
385 /* Calculate the start and end bins of the coupling channel */
386 p_ac3dec->audblk.cplstrtmant = (p_ac3dec->audblk.cplbegf * 12) + 37 ;
387 p_ac3dec->audblk.cplendmant = ((p_ac3dec->audblk.cplendf + 3) * 12) + 37;
389 /* The number of combined subbands is ncplsubnd minus each combined
391 p_ac3dec->audblk.ncplbnd = p_ac3dec->audblk.ncplsubnd;
393 for (i=1; i< p_ac3dec->audblk.ncplsubnd; i++)
395 p_ac3dec->audblk.cplbndstrc[i] = GetBits (&p_ac3dec->bit_stream,1);
396 p_ac3dec->audblk.ncplbnd -= p_ac3dec->audblk.cplbndstrc[i];
398 p_ac3dec->total_bits_read += p_ac3dec->audblk.ncplsubnd - 1;
400 p_ac3dec->total_bits_read += 1;
403 if (p_ac3dec->audblk.cplinu)
405 /* Loop through all the channels and get their coupling co-ords */
406 for (i=0; i < p_ac3dec->bsi.nfchans;i++)
408 if (!p_ac3dec->audblk.chincpl[i])
413 /* Is there new coupling co-ordinate info? */
414 p_ac3dec->audblk.cplcoe[i] = GetBits (&p_ac3dec->bit_stream,1);
416 if ((!blknum) && (!p_ac3dec->audblk.cplcoe[i]))
421 if (p_ac3dec->audblk.cplcoe[i])
423 p_ac3dec->audblk.mstrcplco[i] = GetBits (&p_ac3dec->bit_stream,2);
424 p_ac3dec->total_bits_read += 2;
425 for (j=0;j < p_ac3dec->audblk.ncplbnd; j++)
427 p_ac3dec->audblk.cplcoexp[i][j] = GetBits (&p_ac3dec->bit_stream,4);
428 p_ac3dec->audblk.cplcomant[i][j] = GetBits (&p_ac3dec->bit_stream,4);
430 p_ac3dec->total_bits_read += 8 * p_ac3dec->audblk.ncplbnd;
433 p_ac3dec->total_bits_read += p_ac3dec->bsi.nfchans;
435 /* If we're in dual mono mode, there's going to be some phase info */
436 if ((p_ac3dec->bsi.acmod == 0x2) && p_ac3dec->audblk.phsflginu &&
437 (p_ac3dec->audblk.cplcoe[0] || p_ac3dec->audblk.cplcoe[1]))
439 for (j=0; j < p_ac3dec->audblk.ncplbnd; j++)
441 p_ac3dec->audblk.phsflg[j] = GetBits (&p_ac3dec->bit_stream,1);
443 p_ac3dec->total_bits_read += p_ac3dec->audblk.ncplbnd;
448 /* If we're in dual mono mode, there may be a rematrix strategy */
449 if (p_ac3dec->bsi.acmod == 0x2)
451 p_ac3dec->audblk.rematstr = GetBits (&p_ac3dec->bit_stream,1);
452 p_ac3dec->total_bits_read += 1;
454 if ((!blknum) && (!p_ac3dec->audblk.rematstr))
459 if (p_ac3dec->audblk.rematstr)
461 if (p_ac3dec->audblk.cplinu == 0)
463 for (i = 0; i < 4; i++)
465 p_ac3dec->audblk.rematflg[i] = GetBits (&p_ac3dec->bit_stream,1);
467 p_ac3dec->total_bits_read += 4;
469 if ((p_ac3dec->audblk.cplbegf > 2) && p_ac3dec->audblk.cplinu)
471 for (i = 0; i < 4; i++)
473 p_ac3dec->audblk.rematflg[i] = GetBits (&p_ac3dec->bit_stream,1);
475 p_ac3dec->total_bits_read += 4;
477 if ((p_ac3dec->audblk.cplbegf <= 2) && p_ac3dec->audblk.cplinu)
479 for (i = 0; i < 3; i++)
481 p_ac3dec->audblk.rematflg[i] = GetBits (&p_ac3dec->bit_stream,1);
483 p_ac3dec->total_bits_read += 3;
485 if ((p_ac3dec->audblk.cplbegf == 0) && p_ac3dec->audblk.cplinu)
487 for (i = 0; i < 2; i++)
489 p_ac3dec->audblk.rematflg[i] = GetBits (&p_ac3dec->bit_stream,1);
491 p_ac3dec->total_bits_read += 2;
496 if (p_ac3dec->audblk.cplinu)
498 /* Get the coupling channel exponent strategy */
499 p_ac3dec->audblk.cplexpstr = GetBits (&p_ac3dec->bit_stream,2);
500 p_ac3dec->total_bits_read += 2;
502 if ((!blknum) && (p_ac3dec->audblk.cplexpstr == EXP_REUSE))
507 if (p_ac3dec->audblk.cplexpstr==0)
509 p_ac3dec->audblk.ncplgrps = 0;
513 p_ac3dec->audblk.ncplgrps = (p_ac3dec->audblk.cplendmant - p_ac3dec->audblk.cplstrtmant) /
514 (3 << (p_ac3dec->audblk.cplexpstr-1));
519 for (i = 0; i < p_ac3dec->bsi.nfchans; i++)
521 p_ac3dec->audblk.chexpstr[i] = GetBits (&p_ac3dec->bit_stream,2);
522 p_ac3dec->total_bits_read += 2;
524 if ((!blknum) && (p_ac3dec->audblk.chexpstr[i] == EXP_REUSE))
530 /* Get the exponent strategy for lfe channel */
531 if (p_ac3dec->bsi.lfeon)
533 p_ac3dec->audblk.lfeexpstr = GetBits (&p_ac3dec->bit_stream,1);
534 p_ac3dec->total_bits_read += 1;
536 if ((!blknum) && (p_ac3dec->audblk.lfeexpstr == EXP_REUSE))
542 /* Determine the bandwidths of all the fbw channels */
543 for (i = 0; i < p_ac3dec->bsi.nfchans; i++)
547 if (p_ac3dec->audblk.chexpstr[i] != EXP_REUSE)
549 if (p_ac3dec->audblk.cplinu && p_ac3dec->audblk.chincpl[i])
551 p_ac3dec->audblk.endmant[i] = p_ac3dec->audblk.cplstrtmant;
555 p_ac3dec->audblk.chbwcod[i] = GetBits (&p_ac3dec->bit_stream,6);
556 p_ac3dec->total_bits_read += 6;
558 if (p_ac3dec->audblk.chbwcod[i] > 60)
563 p_ac3dec->audblk.endmant[i] = ((p_ac3dec->audblk.chbwcod[i] + 12) * 3) + 37;
566 /* Calculate the number of exponent groups to fetch */
567 grp_size = 3 * (1 << (p_ac3dec->audblk.chexpstr[i] - 1));
568 p_ac3dec->audblk.nchgrps[i] = (p_ac3dec->audblk.endmant[i] - 1 + (grp_size - 3)) / grp_size;
572 /* Get the coupling exponents if they exist */
573 if (p_ac3dec->audblk.cplinu && (p_ac3dec->audblk.cplexpstr != EXP_REUSE))
575 p_ac3dec->audblk.cplabsexp = GetBits (&p_ac3dec->bit_stream,4);
576 p_ac3dec->total_bits_read += 4;
577 for (i=0; i< p_ac3dec->audblk.ncplgrps;i++)
579 p_ac3dec->audblk.cplexps[i] = GetBits (&p_ac3dec->bit_stream,7);
580 p_ac3dec->total_bits_read += 7;
582 if (p_ac3dec->audblk.cplexps[i] >= 125)
589 /* Get the fwb channel exponents */
590 for (i=0; i < p_ac3dec->bsi.nfchans; i++)
592 if (p_ac3dec->audblk.chexpstr[i] != EXP_REUSE)
594 p_ac3dec->audblk.exps[i][0] = GetBits (&p_ac3dec->bit_stream,4);
595 p_ac3dec->total_bits_read += 4;
596 for (j=1; j<=p_ac3dec->audblk.nchgrps[i];j++)
598 p_ac3dec->audblk.exps[i][j] = GetBits (&p_ac3dec->bit_stream,7);
599 p_ac3dec->total_bits_read += 7;
600 if (p_ac3dec->audblk.exps[i][j] >= 125)
605 p_ac3dec->audblk.gainrng[i] = GetBits (&p_ac3dec->bit_stream,2);
606 p_ac3dec->total_bits_read += 2;
610 /* Get the lfe channel exponents */
611 if (p_ac3dec->bsi.lfeon && (p_ac3dec->audblk.lfeexpstr != EXP_REUSE))
613 p_ac3dec->audblk.lfeexps[0] = GetBits (&p_ac3dec->bit_stream,4);
614 p_ac3dec->audblk.lfeexps[1] = GetBits (&p_ac3dec->bit_stream,7);
615 p_ac3dec->total_bits_read += 11;
616 if (p_ac3dec->audblk.lfeexps[1] >= 125)
620 p_ac3dec->audblk.lfeexps[2] = GetBits (&p_ac3dec->bit_stream,7);
621 p_ac3dec->total_bits_read += 7;
622 if (p_ac3dec->audblk.lfeexps[2] >= 125)
628 /* Get the parametric bit allocation parameters */
629 p_ac3dec->audblk.baie = GetBits (&p_ac3dec->bit_stream,1);
630 p_ac3dec->total_bits_read += 1;
632 if ((!blknum) && (!p_ac3dec->audblk.baie))
637 if (p_ac3dec->audblk.baie)
639 p_ac3dec->audblk.sdcycod = GetBits (&p_ac3dec->bit_stream,2);
640 p_ac3dec->audblk.fdcycod = GetBits (&p_ac3dec->bit_stream,2);
641 p_ac3dec->audblk.sgaincod = GetBits (&p_ac3dec->bit_stream,2);
642 p_ac3dec->audblk.dbpbcod = GetBits (&p_ac3dec->bit_stream,2);
643 p_ac3dec->audblk.floorcod = GetBits (&p_ac3dec->bit_stream,3);
644 p_ac3dec->total_bits_read += 11;
647 /* Get the SNR off set info if it exists */
648 p_ac3dec->audblk.snroffste = GetBits (&p_ac3dec->bit_stream,1);
649 if ((!blknum) && (!p_ac3dec->audblk.snroffste))
654 if (p_ac3dec->audblk.snroffste)
656 p_ac3dec->audblk.csnroffst = GetBits (&p_ac3dec->bit_stream,6);
657 p_ac3dec->total_bits_read += 6;
659 if (p_ac3dec->audblk.cplinu)
661 p_ac3dec->audblk.cplfsnroffst = GetBits (&p_ac3dec->bit_stream,4);
662 p_ac3dec->audblk.cplfgaincod = GetBits (&p_ac3dec->bit_stream,3);
663 p_ac3dec->total_bits_read += 7;
666 for (i = 0;i < p_ac3dec->bsi.nfchans; i++)
668 p_ac3dec->audblk.fsnroffst[i] = GetBits (&p_ac3dec->bit_stream,4);
669 p_ac3dec->audblk.fgaincod[i] = GetBits (&p_ac3dec->bit_stream,3);
671 p_ac3dec->total_bits_read += 7 * p_ac3dec->bsi.nfchans;
672 if (p_ac3dec->bsi.lfeon)
674 p_ac3dec->audblk.lfefsnroffst = GetBits (&p_ac3dec->bit_stream,4);
675 p_ac3dec->audblk.lfefgaincod = GetBits (&p_ac3dec->bit_stream,3);
676 p_ac3dec->total_bits_read += 7;
680 /* Get coupling leakage info if it exists */
681 if (p_ac3dec->audblk.cplinu)
683 p_ac3dec->audblk.cplleake = GetBits (&p_ac3dec->bit_stream,1);
684 p_ac3dec->total_bits_read += 1;
685 if ((!blknum) && (!p_ac3dec->audblk.cplleake))
690 if (p_ac3dec->audblk.cplleake)
692 p_ac3dec->audblk.cplfleak = GetBits (&p_ac3dec->bit_stream,3);
693 p_ac3dec->audblk.cplsleak = GetBits (&p_ac3dec->bit_stream,3);
694 p_ac3dec->total_bits_read += 6;
698 /* Get the delta bit alloaction info */
699 p_ac3dec->audblk.deltbaie = GetBits (&p_ac3dec->bit_stream,1);
700 p_ac3dec->total_bits_read += 1;
702 if (p_ac3dec->audblk.deltbaie)
704 if (p_ac3dec->audblk.cplinu)
706 p_ac3dec->audblk.cpldeltbae = GetBits (&p_ac3dec->bit_stream,2);
707 p_ac3dec->total_bits_read += 2;
708 if (p_ac3dec->audblk.cpldeltbae == 3)
714 for (i = 0;i < p_ac3dec->bsi.nfchans; i++)
716 p_ac3dec->audblk.deltbae[i] = GetBits (&p_ac3dec->bit_stream,2);
717 p_ac3dec->total_bits_read += 2;
718 if (p_ac3dec->audblk.deltbae[i] == 3)
724 if (p_ac3dec->audblk.cplinu && (p_ac3dec->audblk.cpldeltbae == DELTA_BIT_NEW))
726 p_ac3dec->audblk.cpldeltnseg = GetBits (&p_ac3dec->bit_stream,3);
727 for (i = 0;i < p_ac3dec->audblk.cpldeltnseg + 1; i++)
729 p_ac3dec->audblk.cpldeltoffst[i] = GetBits (&p_ac3dec->bit_stream,5);
730 p_ac3dec->audblk.cpldeltlen[i] = GetBits (&p_ac3dec->bit_stream,4);
731 p_ac3dec->audblk.cpldeltba[i] = GetBits (&p_ac3dec->bit_stream,3);
733 p_ac3dec->total_bits_read += 12 * (p_ac3dec->audblk.cpldeltnseg + 1) + 3;
736 for (i = 0; i < p_ac3dec->bsi.nfchans; i++)
738 if (p_ac3dec->audblk.deltbae[i] == DELTA_BIT_NEW)
740 p_ac3dec->audblk.deltnseg[i] = GetBits (&p_ac3dec->bit_stream,3);
741 // if (p_ac3dec->audblk.deltnseg[i] >= 8)
742 // fprintf (stderr, "parse debug: p_ac3dec->audblk.deltnseg[%i] == %i\n", i, p_ac3dec->audblk.deltnseg[i]);
743 for (j = 0; j < p_ac3dec->audblk.deltnseg[i] + 1; j++)
745 p_ac3dec->audblk.deltoffst[i][j] = GetBits (&p_ac3dec->bit_stream,5);
746 p_ac3dec->audblk.deltlen[i][j] = GetBits (&p_ac3dec->bit_stream,4);
747 p_ac3dec->audblk.deltba[i][j] = GetBits (&p_ac3dec->bit_stream,3);
749 p_ac3dec->total_bits_read += 12 * (p_ac3dec->audblk.deltnseg[i] + 1) + 3;
754 /* Check to see if there's any dummy info to get */
755 p_ac3dec->audblk.skiple = GetBits (&p_ac3dec->bit_stream,1);
756 p_ac3dec->total_bits_read += 1;
758 if (p_ac3dec->audblk.skiple)
760 p_ac3dec->audblk.skipl = GetBits (&p_ac3dec->bit_stream,9);
762 for (i = 0; i < p_ac3dec->audblk.skipl ; i++)
764 GetBits (&p_ac3dec->bit_stream,8);
766 p_ac3dec->total_bits_read += 8 * p_ac3dec->audblk.skipl + 9;
769 parse_audblk_stats(p_ac3dec);
774 void parse_auxdata (ac3dec_t * p_ac3dec)
779 skip_length = (p_ac3dec->syncinfo.frame_size * 16) - p_ac3dec->total_bits_read - 17 - 1;
781 for (i = 0; i < skip_length; i++)
783 RemoveBits (&p_ac3dec->bit_stream,1);
786 /* get the auxdata exists bit */
787 RemoveBits (&p_ac3dec->bit_stream,1);
789 /* Skip the CRC reserved bit */
790 RemoveBits (&p_ac3dec->bit_stream,1);
793 RemoveBits (&p_ac3dec->bit_stream,16);
796 static void parse_bsi_stats (ac3dec_t * p_ac3dec) /* Some stats */
804 static const char *service_ids[8] =
810 static const struct mixlev_s cmixlev_tbl[4] =
812 {0.707, "(-3.0 dB)"}, {0.595, "(-4.5 dB)"},
813 {0.500, "(-6.0 dB)"}, {1.0, "Invalid"}
815 static const struct mixlev_s smixlev_tbl[4] =
817 {0.707, "(-3.0 dB)"}, {0.500, "(-6.0 dB)"},
818 { 0.0, "off "}, { 1.0, "Invalid"}
826 /* if ((p_ac3dec->bsi.acmod & 0x1) && (p_ac3dec->bsi.acmod != 0x1))
827 printf("CentreMixLevel %s ",cmixlev_tbl[p_ac3dec->bsi.cmixlev].desc);
828 if (p_ac3dec->bsi.acmod & 0x4)
829 printf("SurMixLevel %s",smixlev_tbl[p_ac3dec->bsi.cmixlev].desc);
831 intf_Msg ( "(ac3dec_parsebsi) %s %d.%d Mode",
832 service_ids[p_ac3dec->bsi.bsmod],
833 p_ac3dec->bsi.nfchans,p_ac3dec->bsi.lfeon);
842 static void parse_audblk_stats (ac3dec_t * p_ac3dec)
845 char *exp_strat_tbl[4] = {"R ","D15 ","D25 ","D45 "};
847 intf_ErrMsg ("(ac3dec_parseaudblk) ");
848 intf_ErrMsg ("%s ",p_ac3dec->audblk.cplinu ? "cpl on" : "cpl off");
849 intf_ErrMsg ("%s ",p_ac3dec->audblk.baie? "bai" : " ");
850 intf_ErrMsg ("%s ",p_ac3dec->audblk.snroffste? "snroffst" : " ");
851 intf_ErrMsg ("%s ",p_ac3dec->audblk.deltbaie? "deltba" : " ");
852 intf_ErrMsg ("%s ",p_ac3dec->audblk.phsflginu? "phsflg" : " ");
853 intf_ErrMsg ("(%s %s %s %s %s) ",exp_strat_tbl[p_ac3dec->audblk.chexpstr[0]],
854 exp_strat_tbl[p_ac3dec->audblk.chexpstr[1]],exp_strat_tbl[p_ac3dec->audblk.chexpstr[2]],
855 exp_strat_tbl[p_ac3dec->audblk.chexpstr[3]],exp_strat_tbl[p_ac3dec->audblk.chexpstr[4]]);
857 for(i=0;i<p_ac3dec->bsi.nfchans;i++)
858 intf_ErrMsg ("%1d",p_ac3dec->audblk.blksw[i]);