1 /*****************************************************************************
2 * ac3_parse.c: ac3 parsing procedures
3 *****************************************************************************
4 * Copyright (C) 1999, 2000, 2001 VideoLAN
5 * $Id: ac3_parse.c,v 1.18 2001/04/20 12:14:34 reno 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 *****************************************************************************/
34 #include "stream_control.h"
35 #include "input_ext-dec.h"
37 #include "audio_output.h"
40 #include "ac3_decoder.h"
41 #include "ac3_decoder_thread.h"
43 #include "ac3_internal.h"
46 static const u16 nfchans[] = { 2, 1, 2, 3, 3, 4, 4, 5 };
54 static const struct frmsize_s frmsizecod_tbl[] =
56 { 32 ,{64 ,69 ,96 } },
57 { 32 ,{64 ,70 ,96 } },
58 { 40 ,{80 ,87 ,120 } },
59 { 40 ,{80 ,88 ,120 } },
60 { 48 ,{96 ,104 ,144 } },
61 { 48 ,{96 ,105 ,144 } },
62 { 56 ,{112 ,121 ,168 } },
63 { 56 ,{112 ,122 ,168 } },
64 { 64 ,{128 ,139 ,192 } },
65 { 64 ,{128 ,140 ,192 } },
66 { 80 ,{160 ,174 ,240 } },
67 { 80 ,{160 ,175 ,240 } },
68 { 96 ,{192 ,208 ,288 } },
69 { 96 ,{192 ,209 ,288 } },
70 { 112 ,{224 ,243 ,336 } },
71 { 112 ,{224 ,244 ,336 } },
72 { 128 ,{256 ,278 ,384 } },
73 { 128 ,{256 ,279 ,384 } },
74 { 160 ,{320 ,348 ,480 } },
75 { 160 ,{320 ,349 ,480 } },
76 { 192 ,{384 ,417 ,576 } },
77 { 192 ,{384 ,418 ,576 } },
78 { 224 ,{448 ,487 ,672 } },
79 { 224 ,{448 ,488 ,672 } },
80 { 256 ,{512 ,557 ,768 } },
81 { 256 ,{512 ,558 ,768 } },
82 { 320 ,{640 ,696 ,960 } },
83 { 320 ,{640 ,697 ,960 } },
84 { 384 ,{768 ,835 ,1152 } },
85 { 384 ,{768 ,836 ,1152 } },
86 { 448 ,{896 ,975 ,1344 } },
87 { 448 ,{896 ,976 ,1344 } },
88 { 512 ,{1024 ,1114 ,1536 } },
89 { 512 ,{1024 ,1115 ,1536 } },
90 { 576 ,{1152 ,1253 ,1728 } },
91 { 576 ,{1152 ,1254 ,1728 } },
92 { 640 ,{1280 ,1393 ,1920 } },
93 { 640 ,{1280 ,1394 ,1920 } }};
95 static const int fscod_tbl[] = {48000, 44100, 32000};
97 /* Some internal functions */
98 void parse_bsi_stats (ac3dec_t * p_ac3dec);
99 void parse_audblk_stats (ac3dec_t * p_ac3dec);
101 /* Parse a syncinfo structure */
102 int ac3_sync_frame (ac3dec_t * p_ac3dec, ac3_sync_info_t * p_sync_info)
104 ac3dec_thread_t * p_ac3dec_t = (ac3dec_thread_t *) p_ac3dec->bit_stream.p_callback_arg;
106 p_ac3dec->total_bits_read = 0;
107 p_ac3dec->i_available = 0;
109 /* sync word - should be 0x0b77 */
110 RealignBits(&p_ac3dec->bit_stream);
111 while( (ShowBits (&p_ac3dec->bit_stream,16)) != 0x0b77 &&
112 (!p_ac3dec_t->p_fifo->b_die) && (!p_ac3dec_t->p_fifo->b_error))
114 RemoveBits (&p_ac3dec->bit_stream,8);
115 p_ac3dec->total_bits_read += 8;
117 RemoveBits (&p_ac3dec->bit_stream,16);
118 p_ac3dec->total_bits_read += 16;
121 /* Get crc1 - we don't actually use this data though */
122 GetBits (&p_ac3dec->bit_stream,16);
124 /* Get the sampling rate */
125 p_ac3dec->syncinfo.fscod = GetBits (&p_ac3dec->bit_stream,2);
127 if (p_ac3dec->syncinfo.fscod >= 3)
129 p_ac3dec->total_bits_read += 34;
133 /* Get the frame size code */
134 p_ac3dec->syncinfo.frmsizecod = GetBits (&p_ac3dec->bit_stream,6);
135 p_ac3dec->total_bits_read += 40;
137 if (p_ac3dec->syncinfo.frmsizecod >= 38)
142 p_sync_info->bit_rate = frmsizecod_tbl[p_ac3dec->syncinfo.frmsizecod].bit_rate;
144 p_ac3dec->syncinfo.frame_size = frmsizecod_tbl[p_ac3dec->syncinfo.frmsizecod].frm_size[p_ac3dec->syncinfo.fscod];
145 p_sync_info->frame_size = 2 * p_ac3dec->syncinfo.frame_size;
147 p_sync_info->sample_rate = fscod_tbl[p_ac3dec->syncinfo.fscod];
153 * This routine fills a bsi struct from the AC3 stream
155 int parse_bsi (ac3dec_t * p_ac3dec)
157 /* Check the AC-3 version number */
158 p_ac3dec->bsi.bsid = GetBits (&p_ac3dec->bit_stream,5);
160 if (p_ac3dec->bsi.bsid > 8)
165 /* Get the audio service provided by the stream */
166 p_ac3dec->bsi.bsmod = GetBits (&p_ac3dec->bit_stream,3);
168 /* Get the audio coding mode (ie how many channels)*/
169 p_ac3dec->bsi.acmod = GetBits (&p_ac3dec->bit_stream,3);
171 /* Predecode the number of full bandwidth channels as we use this
173 p_ac3dec->bsi.nfchans = nfchans[p_ac3dec->bsi.acmod];
175 /* If it is in use, get the centre channel mix level */
176 if ((p_ac3dec->bsi.acmod & 0x1) && (p_ac3dec->bsi.acmod != 0x1))
178 p_ac3dec->bsi.cmixlev = GetBits (&p_ac3dec->bit_stream,2);
179 p_ac3dec->total_bits_read += 2;
182 /* If it is in use, get the surround channel mix level */
183 if (p_ac3dec->bsi.acmod & 0x4)
185 p_ac3dec->bsi.surmixlev = GetBits (&p_ac3dec->bit_stream,2);
186 p_ac3dec->total_bits_read += 2;
189 /* Get the dolby surround mode if in 2/0 mode */
190 if (p_ac3dec->bsi.acmod == 0x2)
192 p_ac3dec->bsi.dsurmod = GetBits (&p_ac3dec->bit_stream,2);
193 p_ac3dec->total_bits_read += 2;
196 /* Is the low frequency effects channel on? */
197 p_ac3dec->bsi.lfeon = GetBits (&p_ac3dec->bit_stream,1);
199 /* Get the dialogue normalization level */
200 p_ac3dec->bsi.dialnorm = GetBits (&p_ac3dec->bit_stream,5);
202 /* Does compression gain exist? */
203 if ((p_ac3dec->bsi.compre = GetBits (&p_ac3dec->bit_stream,1)))
205 /* Get compression gain */
206 p_ac3dec->bsi.compr = GetBits (&p_ac3dec->bit_stream,8);
207 p_ac3dec->total_bits_read += 8;
210 /* Does language code exist? */
211 if ((p_ac3dec->bsi.langcode = GetBits (&p_ac3dec->bit_stream,1)))
213 /* Get langauge code */
214 p_ac3dec->bsi.langcod = GetBits (&p_ac3dec->bit_stream,8);
215 p_ac3dec->total_bits_read += 8;
218 /* Does audio production info exist? */
219 if ((p_ac3dec->bsi.audprodie = GetBits (&p_ac3dec->bit_stream,1)))
222 p_ac3dec->bsi.mixlevel = GetBits (&p_ac3dec->bit_stream,5);
225 p_ac3dec->bsi.roomtyp = GetBits (&p_ac3dec->bit_stream,2);
226 p_ac3dec->total_bits_read += 7;
229 /* If we're in dual mono mode then get some extra info */
230 if (p_ac3dec->bsi.acmod == 0)
232 /* Get the dialogue normalization level two */
233 p_ac3dec->bsi.dialnorm2 = GetBits (&p_ac3dec->bit_stream,5);
235 /* Does compression gain two exist? */
236 if ((p_ac3dec->bsi.compr2e = GetBits (&p_ac3dec->bit_stream,1)))
238 /* Get compression gain two */
239 p_ac3dec->bsi.compr2 = GetBits (&p_ac3dec->bit_stream,8);
240 p_ac3dec->total_bits_read += 8;
243 /* Does language code two exist? */
244 if ((p_ac3dec->bsi.langcod2e = GetBits (&p_ac3dec->bit_stream,1)))
246 /* Get langauge code two */
247 p_ac3dec->bsi.langcod2 = GetBits (&p_ac3dec->bit_stream,8);
248 p_ac3dec->total_bits_read += 8;
251 /* Does audio production info two exist? */
252 if ((p_ac3dec->bsi.audprodi2e = GetBits (&p_ac3dec->bit_stream,1)))
254 /* Get mix level two */
255 p_ac3dec->bsi.mixlevel2 = GetBits (&p_ac3dec->bit_stream,5);
257 /* Get room type two */
258 p_ac3dec->bsi.roomtyp2 = GetBits (&p_ac3dec->bit_stream,2);
259 p_ac3dec->total_bits_read += 7;
261 p_ac3dec->total_bits_read += 8;
264 /* Get the copyright bit */
265 p_ac3dec->bsi.copyrightb = GetBits (&p_ac3dec->bit_stream,1);
267 /* Get the original bit */
268 p_ac3dec->bsi.origbs = GetBits (&p_ac3dec->bit_stream,1);
270 /* Does timecode one exist? */
271 if ((p_ac3dec->bsi.timecod1e = GetBits (&p_ac3dec->bit_stream,1)))
273 p_ac3dec->bsi.timecod1 = GetBits (&p_ac3dec->bit_stream,14);
274 p_ac3dec->total_bits_read += 14;
277 /* Does timecode two exist? */
278 if ((p_ac3dec->bsi.timecod2e = GetBits (&p_ac3dec->bit_stream,1)))
280 p_ac3dec->bsi.timecod2 = GetBits (&p_ac3dec->bit_stream,14);
281 p_ac3dec->total_bits_read += 14;
284 /* Does addition info exist? */
285 if ((p_ac3dec->bsi.addbsie = GetBits (&p_ac3dec->bit_stream,1)))
289 /* Get how much info is there */
290 p_ac3dec->bsi.addbsil = GetBits (&p_ac3dec->bit_stream,6);
292 /* Get the additional info */
293 for (i=0;i<(p_ac3dec->bsi.addbsil + 1);i++)
295 p_ac3dec->bsi.addbsi[i] = GetBits (&p_ac3dec->bit_stream,8);
297 p_ac3dec->total_bits_read += 6 + 8 * (p_ac3dec->bsi.addbsil + 1);
299 p_ac3dec->total_bits_read += 25;
302 parse_bsi_stats (p_ac3dec);
308 /* More pain inducing parsing */
309 int parse_audblk (ac3dec_t * p_ac3dec, int blknum)
313 for (i=0; i < p_ac3dec->bsi.nfchans; i++)
315 /* Is this channel an interleaved 256 + 256 block ? */
316 p_ac3dec->audblk.blksw[i] = GetBits (&p_ac3dec->bit_stream,1);
319 for (i=0; i < p_ac3dec->bsi.nfchans; i++)
321 /* Should we dither this channel? */
322 p_ac3dec->audblk.dithflag[i] = GetBits (&p_ac3dec->bit_stream,1);
325 /* Does dynamic range control exist? */
326 if ((p_ac3dec->audblk.dynrnge = GetBits (&p_ac3dec->bit_stream,1)))
328 /* Get dynamic range info */
329 p_ac3dec->audblk.dynrng = GetBits (&p_ac3dec->bit_stream,8);
330 p_ac3dec->total_bits_read += 8;
333 /* If we're in dual mono mode then get the second channel DR info */
334 if (p_ac3dec->bsi.acmod == 0)
336 /* Does dynamic range control two exist? */
337 if ((p_ac3dec->audblk.dynrng2e = GetBits (&p_ac3dec->bit_stream,1)))
339 /* Get dynamic range info */
340 p_ac3dec->audblk.dynrng2 = GetBits (&p_ac3dec->bit_stream,8);
341 p_ac3dec->total_bits_read += 8;
343 p_ac3dec->total_bits_read += 1;
346 /* Does coupling strategy exist? */
347 p_ac3dec->audblk.cplstre = GetBits (&p_ac3dec->bit_stream,1);
348 p_ac3dec->total_bits_read += 2 + 2 * p_ac3dec->bsi.nfchans;
350 if ((!blknum) && (!p_ac3dec->audblk.cplstre))
355 if (p_ac3dec->audblk.cplstre)
357 /* Is coupling turned on? */
358 if ((p_ac3dec->audblk.cplinu = GetBits (&p_ac3dec->bit_stream,1)))
360 int nb_coupled_channels;
362 nb_coupled_channels = 0;
363 for (i=0; i < p_ac3dec->bsi.nfchans; i++)
365 p_ac3dec->audblk.chincpl[i] = GetBits (&p_ac3dec->bit_stream,1);
366 if (p_ac3dec->audblk.chincpl[i])
368 nb_coupled_channels++;
371 p_ac3dec->total_bits_read += p_ac3dec->bsi.nfchans;
373 if (nb_coupled_channels < 2)
378 if (p_ac3dec->bsi.acmod == 0x2)
380 p_ac3dec->audblk.phsflginu = GetBits (&p_ac3dec->bit_stream,1);
381 p_ac3dec->total_bits_read += 1;
383 p_ac3dec->audblk.cplbegf = GetBits (&p_ac3dec->bit_stream,4);
384 p_ac3dec->audblk.cplendf = GetBits (&p_ac3dec->bit_stream,4);
385 p_ac3dec->total_bits_read += 8;
387 if (p_ac3dec->audblk.cplbegf > p_ac3dec->audblk.cplendf + 2)
392 p_ac3dec->audblk.ncplsubnd = (p_ac3dec->audblk.cplendf + 2) - p_ac3dec->audblk.cplbegf + 1;
394 /* Calculate the start and end bins of the coupling channel */
395 p_ac3dec->audblk.cplstrtmant = (p_ac3dec->audblk.cplbegf * 12) + 37 ;
396 p_ac3dec->audblk.cplendmant = ((p_ac3dec->audblk.cplendf + 3) * 12) + 37;
398 /* The number of combined subbands is ncplsubnd minus each combined
400 p_ac3dec->audblk.ncplbnd = p_ac3dec->audblk.ncplsubnd;
402 for (i=1; i< p_ac3dec->audblk.ncplsubnd; i++)
404 p_ac3dec->audblk.cplbndstrc[i] = GetBits (&p_ac3dec->bit_stream,1);
405 p_ac3dec->audblk.ncplbnd -= p_ac3dec->audblk.cplbndstrc[i];
407 p_ac3dec->total_bits_read += p_ac3dec->audblk.ncplsubnd - 1;
409 p_ac3dec->total_bits_read += 1;
412 if (p_ac3dec->audblk.cplinu)
414 /* Loop through all the channels and get their coupling co-ords */
415 for (i=0; i < p_ac3dec->bsi.nfchans;i++)
417 if (!p_ac3dec->audblk.chincpl[i])
422 /* Is there new coupling co-ordinate info? */
423 p_ac3dec->audblk.cplcoe[i] = GetBits (&p_ac3dec->bit_stream,1);
425 if ((!blknum) && (!p_ac3dec->audblk.cplcoe[i]))
430 if (p_ac3dec->audblk.cplcoe[i])
432 p_ac3dec->audblk.mstrcplco[i] = GetBits (&p_ac3dec->bit_stream,2);
433 p_ac3dec->total_bits_read += 2;
434 for (j=0;j < p_ac3dec->audblk.ncplbnd; j++)
436 p_ac3dec->audblk.cplcoexp[i][j] = GetBits (&p_ac3dec->bit_stream,4);
437 p_ac3dec->audblk.cplcomant[i][j] = GetBits (&p_ac3dec->bit_stream,4);
439 p_ac3dec->total_bits_read += 8 * p_ac3dec->audblk.ncplbnd;
442 p_ac3dec->total_bits_read += p_ac3dec->bsi.nfchans;
444 /* If we're in dual mono mode, there's going to be some phase info */
445 if ((p_ac3dec->bsi.acmod == 0x2) && p_ac3dec->audblk.phsflginu &&
446 (p_ac3dec->audblk.cplcoe[0] || p_ac3dec->audblk.cplcoe[1]))
448 for (j=0; j < p_ac3dec->audblk.ncplbnd; j++)
450 p_ac3dec->audblk.phsflg[j] = GetBits (&p_ac3dec->bit_stream,1);
452 p_ac3dec->total_bits_read += p_ac3dec->audblk.ncplbnd;
457 /* If we're in dual mono mode, there may be a rematrix strategy */
458 if (p_ac3dec->bsi.acmod == 0x2)
460 p_ac3dec->audblk.rematstr = GetBits (&p_ac3dec->bit_stream,1);
461 p_ac3dec->total_bits_read += 1;
463 if ((!blknum) && (!p_ac3dec->audblk.rematstr))
468 if (p_ac3dec->audblk.rematstr)
470 if (p_ac3dec->audblk.cplinu == 0)
472 for (i = 0; i < 4; i++)
474 p_ac3dec->audblk.rematflg[i] = GetBits (&p_ac3dec->bit_stream,1);
476 p_ac3dec->total_bits_read += 4;
478 if ((p_ac3dec->audblk.cplbegf > 2) && p_ac3dec->audblk.cplinu)
480 for (i = 0; i < 4; i++)
482 p_ac3dec->audblk.rematflg[i] = GetBits (&p_ac3dec->bit_stream,1);
484 p_ac3dec->total_bits_read += 4;
486 if ((p_ac3dec->audblk.cplbegf <= 2) && p_ac3dec->audblk.cplinu)
488 for (i = 0; i < 3; i++)
490 p_ac3dec->audblk.rematflg[i] = GetBits (&p_ac3dec->bit_stream,1);
492 p_ac3dec->total_bits_read += 3;
494 if ((p_ac3dec->audblk.cplbegf == 0) && p_ac3dec->audblk.cplinu)
496 for (i = 0; i < 2; i++)
498 p_ac3dec->audblk.rematflg[i] = GetBits (&p_ac3dec->bit_stream,1);
500 p_ac3dec->total_bits_read += 2;
505 if (p_ac3dec->audblk.cplinu)
507 /* Get the coupling channel exponent strategy */
508 p_ac3dec->audblk.cplexpstr = GetBits (&p_ac3dec->bit_stream,2);
509 p_ac3dec->total_bits_read += 2;
511 if ((!blknum) && (p_ac3dec->audblk.cplexpstr == EXP_REUSE))
516 if (p_ac3dec->audblk.cplexpstr==0)
518 p_ac3dec->audblk.ncplgrps = 0;
522 p_ac3dec->audblk.ncplgrps = (p_ac3dec->audblk.cplendmant - p_ac3dec->audblk.cplstrtmant) /
523 (3 << (p_ac3dec->audblk.cplexpstr-1));
528 for (i = 0; i < p_ac3dec->bsi.nfchans; i++)
530 p_ac3dec->audblk.chexpstr[i] = GetBits (&p_ac3dec->bit_stream,2);
531 p_ac3dec->total_bits_read += 2;
533 if ((!blknum) && (p_ac3dec->audblk.chexpstr[i] == EXP_REUSE))
539 /* Get the exponent strategy for lfe channel */
540 if (p_ac3dec->bsi.lfeon)
542 p_ac3dec->audblk.lfeexpstr = GetBits (&p_ac3dec->bit_stream,1);
543 p_ac3dec->total_bits_read += 1;
545 if ((!blknum) && (p_ac3dec->audblk.lfeexpstr == EXP_REUSE))
551 /* Determine the bandwidths of all the fbw channels */
552 for (i = 0; i < p_ac3dec->bsi.nfchans; i++)
556 if (p_ac3dec->audblk.chexpstr[i] != EXP_REUSE)
558 if (p_ac3dec->audblk.cplinu && p_ac3dec->audblk.chincpl[i])
560 p_ac3dec->audblk.endmant[i] = p_ac3dec->audblk.cplstrtmant;
564 p_ac3dec->audblk.chbwcod[i] = GetBits (&p_ac3dec->bit_stream,6);
565 p_ac3dec->total_bits_read += 6;
567 if (p_ac3dec->audblk.chbwcod[i] > 60)
572 p_ac3dec->audblk.endmant[i] = ((p_ac3dec->audblk.chbwcod[i] + 12) * 3) + 37;
575 /* Calculate the number of exponent groups to fetch */
576 grp_size = 3 * (1 << (p_ac3dec->audblk.chexpstr[i] - 1));
577 p_ac3dec->audblk.nchgrps[i] = (p_ac3dec->audblk.endmant[i] - 1 + (grp_size - 3)) / grp_size;
581 /* Get the coupling exponents if they exist */
582 if (p_ac3dec->audblk.cplinu && (p_ac3dec->audblk.cplexpstr != EXP_REUSE))
584 p_ac3dec->audblk.cplabsexp = GetBits (&p_ac3dec->bit_stream,4);
585 p_ac3dec->total_bits_read += 4;
586 for (i=0; i< p_ac3dec->audblk.ncplgrps;i++)
588 p_ac3dec->audblk.cplexps[i] = GetBits (&p_ac3dec->bit_stream,7);
589 p_ac3dec->total_bits_read += 7;
591 if (p_ac3dec->audblk.cplexps[i] >= 125)
598 /* Get the fwb channel exponents */
599 for (i=0; i < p_ac3dec->bsi.nfchans; i++)
601 if (p_ac3dec->audblk.chexpstr[i] != EXP_REUSE)
603 p_ac3dec->audblk.exps[i][0] = GetBits (&p_ac3dec->bit_stream,4);
604 p_ac3dec->total_bits_read += 4;
605 for (j=1; j<=p_ac3dec->audblk.nchgrps[i];j++)
607 p_ac3dec->audblk.exps[i][j] = GetBits (&p_ac3dec->bit_stream,7);
608 p_ac3dec->total_bits_read += 7;
609 if (p_ac3dec->audblk.exps[i][j] >= 125)
614 p_ac3dec->audblk.gainrng[i] = GetBits (&p_ac3dec->bit_stream,2);
618 /* Get the lfe channel exponents */
619 if (p_ac3dec->bsi.lfeon && (p_ac3dec->audblk.lfeexpstr != EXP_REUSE))
621 p_ac3dec->audblk.lfeexps[0] = GetBits (&p_ac3dec->bit_stream,4);
622 p_ac3dec->audblk.lfeexps[1] = GetBits (&p_ac3dec->bit_stream,7);
623 p_ac3dec->total_bits_read += 11;
624 if (p_ac3dec->audblk.lfeexps[1] >= 125)
628 p_ac3dec->audblk.lfeexps[2] = GetBits (&p_ac3dec->bit_stream,7);
629 p_ac3dec->total_bits_read += 7;
630 if (p_ac3dec->audblk.lfeexps[2] >= 125)
636 /* Get the parametric bit allocation parameters */
637 p_ac3dec->audblk.baie = GetBits (&p_ac3dec->bit_stream,1);
638 p_ac3dec->total_bits_read += 1;
640 if ((!blknum) && (!p_ac3dec->audblk.baie))
645 if (p_ac3dec->audblk.baie)
647 p_ac3dec->audblk.sdcycod = GetBits (&p_ac3dec->bit_stream,2);
648 p_ac3dec->audblk.fdcycod = GetBits (&p_ac3dec->bit_stream,2);
649 p_ac3dec->audblk.sgaincod = GetBits (&p_ac3dec->bit_stream,2);
650 p_ac3dec->audblk.dbpbcod = GetBits (&p_ac3dec->bit_stream,2);
651 p_ac3dec->audblk.floorcod = GetBits (&p_ac3dec->bit_stream,3);
652 p_ac3dec->total_bits_read += 11;
655 /* Get the SNR off set info if it exists */
656 p_ac3dec->audblk.snroffste = GetBits (&p_ac3dec->bit_stream,1);
657 if ((!blknum) && (!p_ac3dec->audblk.snroffste))
662 if (p_ac3dec->audblk.snroffste)
664 p_ac3dec->audblk.csnroffst = GetBits (&p_ac3dec->bit_stream,6);
665 p_ac3dec->total_bits_read += 6;
667 if (p_ac3dec->audblk.cplinu)
669 p_ac3dec->audblk.cplfsnroffst = GetBits (&p_ac3dec->bit_stream,4);
670 p_ac3dec->audblk.cplfgaincod = GetBits (&p_ac3dec->bit_stream,3);
671 p_ac3dec->total_bits_read += 7;
674 for (i = 0;i < p_ac3dec->bsi.nfchans; i++)
676 p_ac3dec->audblk.fsnroffst[i] = GetBits (&p_ac3dec->bit_stream,4);
677 p_ac3dec->audblk.fgaincod[i] = GetBits (&p_ac3dec->bit_stream,3);
679 p_ac3dec->total_bits_read += 7 * p_ac3dec->bsi.nfchans;
680 if (p_ac3dec->bsi.lfeon)
682 p_ac3dec->audblk.lfefsnroffst = GetBits (&p_ac3dec->bit_stream,4);
683 p_ac3dec->audblk.lfefgaincod = GetBits (&p_ac3dec->bit_stream,3);
684 p_ac3dec->total_bits_read += 7;
688 /* Get coupling leakage info if it exists */
689 if (p_ac3dec->audblk.cplinu)
691 p_ac3dec->audblk.cplleake = GetBits (&p_ac3dec->bit_stream,1);
692 p_ac3dec->total_bits_read += 1;
693 if ((!blknum) && (!p_ac3dec->audblk.cplleake))
698 if (p_ac3dec->audblk.cplleake)
700 p_ac3dec->audblk.cplfleak = GetBits (&p_ac3dec->bit_stream,3);
701 p_ac3dec->audblk.cplsleak = GetBits (&p_ac3dec->bit_stream,3);
702 p_ac3dec->total_bits_read += 6;
706 /* Get the delta bit alloaction info */
707 p_ac3dec->audblk.deltbaie = GetBits (&p_ac3dec->bit_stream,1);
708 p_ac3dec->total_bits_read += 1;
710 if (p_ac3dec->audblk.deltbaie)
712 if (p_ac3dec->audblk.cplinu)
714 p_ac3dec->audblk.cpldeltbae = GetBits (&p_ac3dec->bit_stream,2);
715 p_ac3dec->total_bits_read += 2;
716 if (p_ac3dec->audblk.cpldeltbae == 3)
722 for (i = 0;i < p_ac3dec->bsi.nfchans; i++)
724 p_ac3dec->audblk.deltbae[i] = GetBits (&p_ac3dec->bit_stream,2);
725 p_ac3dec->total_bits_read += 2;
726 if (p_ac3dec->audblk.deltbae[i] == 3)
732 if (p_ac3dec->audblk.cplinu && (p_ac3dec->audblk.cpldeltbae == DELTA_BIT_NEW))
734 p_ac3dec->audblk.cpldeltnseg = GetBits (&p_ac3dec->bit_stream,3);
735 for (i = 0;i < p_ac3dec->audblk.cpldeltnseg + 1; i++)
737 p_ac3dec->audblk.cpldeltoffst[i] = GetBits (&p_ac3dec->bit_stream,5);
738 p_ac3dec->audblk.cpldeltlen[i] = GetBits (&p_ac3dec->bit_stream,4);
739 p_ac3dec->audblk.cpldeltba[i] = GetBits (&p_ac3dec->bit_stream,3);
741 p_ac3dec->total_bits_read += 12 * (p_ac3dec->audblk.cpldeltnseg + 1) + 3;
744 for (i = 0; i < p_ac3dec->bsi.nfchans; i++)
746 if (p_ac3dec->audblk.deltbae[i] == DELTA_BIT_NEW)
748 p_ac3dec->audblk.deltnseg[i] = GetBits (&p_ac3dec->bit_stream,3);
749 // if (p_ac3dec->audblk.deltnseg[i] >= 8)
750 // fprintf (stderr, "parse debug: p_ac3dec->audblk.deltnseg[%i] == %i\n", i, p_ac3dec->audblk.deltnseg[i]);
751 for (j = 0; j < p_ac3dec->audblk.deltnseg[i] + 1; j++)
753 p_ac3dec->audblk.deltoffst[i][j] = GetBits (&p_ac3dec->bit_stream,5);
754 p_ac3dec->audblk.deltlen[i][j] = GetBits (&p_ac3dec->bit_stream,4);
755 p_ac3dec->audblk.deltba[i][j] = GetBits (&p_ac3dec->bit_stream,3);
757 p_ac3dec->total_bits_read += 12 * (p_ac3dec->audblk.deltnseg[i] + 1) + 3;
762 /* Check to see if there's any dummy info to get */
763 p_ac3dec->audblk.skiple = GetBits (&p_ac3dec->bit_stream,1);
764 p_ac3dec->total_bits_read += 1;
766 if (p_ac3dec->audblk.skiple)
768 p_ac3dec->audblk.skipl = GetBits (&p_ac3dec->bit_stream,9);
770 for (i = 0; i < p_ac3dec->audblk.skipl ; i++)
772 GetBits (&p_ac3dec->bit_stream,8);
774 p_ac3dec->total_bits_read += 8 * p_ac3dec->audblk.skipl + 9;
778 // parse_audblk_stats(p_ac3dec);
784 void parse_auxdata (ac3dec_t * p_ac3dec)
789 skip_length = (p_ac3dec->syncinfo.frame_size * 16) - p_ac3dec->total_bits_read - 17 - 1;
791 for (i = 0; i < skip_length; i++)
793 RemoveBits (&p_ac3dec->bit_stream,1);
796 /* get the auxdata exists bit */
797 RemoveBits (&p_ac3dec->bit_stream,1);
799 /* Skip the CRC reserved bit */
800 RemoveBits (&p_ac3dec->bit_stream,1);
803 RemoveBits (&p_ac3dec->bit_stream,16);
806 void parse_bsi_stats (ac3dec_t * p_ac3dec) /*Some stats */
813 static const char *service_ids[8] =
819 static const struct mixlev_s cmixlev_tbl[4] =
821 {0.707, "(-3.0 dB)"}, {0.595, "(-4.5 dB)"},
822 {0.500, "(-6.0 dB)"}, {1.0, "Invalid"}
824 static const struct mixlev_s smixlev_tbl[4] =
826 {0.707, "(-3.0 dB)"}, {0.500, "(-6.0 dB)"},
827 { 0.0, "off "}, { 1.0, "Invalid"}
835 /* if ((p_ac3dec->bsi.acmod & 0x1) && (p_ac3dec->bsi.acmod != 0x1))
836 printf("CentreMixLevel %s ",cmixlev_tbl[p_ac3dec->bsi.cmixlev].desc);
837 if (p_ac3dec->bsi.acmod & 0x4)
838 printf("SurMixLevel %s",smixlev_tbl[p_ac3dec->bsi.cmixlev].desc);
840 intf_Msg ( "(ac3dec_parsebsi) %s %d.%d Mode",
841 service_ids[p_ac3dec->bsi.bsmod],
842 p_ac3dec->bsi.nfchans,p_ac3dec->bsi.lfeon);
850 void parse_audblk_stats (ac3dec_t * p_ac3dec)
852 char *exp_strat_tbl[4] = {"R ","D15 ","D25 ","D45 "};
855 intf_ErrMsg ("(ac3dec_parseaudblk) ");
856 intf_ErrMsg ("%s ",p_ac3dec->audblk.cplinu ? "cpl on" : "cpl off");
857 intf_ErrMsg ("%s ",p_ac3dec->audblk.baie? "bai" : " ");
858 intf_ErrMsg ("%s ",p_ac3dec->audblk.snroffste? "snroffst" : " ");
859 intf_ErrMsg ("%s ",p_ac3dec->audblk.deltbaie? "deltba" : " ");
860 intf_ErrMsg ("%s ",p_ac3dec->audblk.phsflginu? "phsflg" : " ");
861 intf_ErrMsg ("(%s %s %s %s %s) ",exp_strat_tbl[p_ac3dec->audblk.chexpstr[0]],
862 exp_strat_tbl[p_ac3dec->audblk.chexpstr[1]],exp_strat_tbl[p_ac3dec->audblk.chexpstr[2]],
863 exp_strat_tbl[p_ac3dec->audblk.chexpstr[3]],exp_strat_tbl[p_ac3dec->audblk.chexpstr[4]]);
865 for(i=0;i<p_ac3dec->bsi.nfchans;i++)
866 intf_ErrMsg ("%1d",p_ac3dec->audblk.blksw[i]);