1 /*****************************************************************************
2 * ac3_parse.c: ac3 parsing procedures
3 *****************************************************************************
4 * Copyright (C) 1999, 2000, 2001 VideoLAN
5 * $Id: ac3_parse.c,v 1.22 2001/05/14 15:58:04 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 *****************************************************************************/
28 #include <string.h> /* memset() */
36 #include "stream_control.h"
37 #include "input_ext-dec.h"
39 #include "audio_output.h"
42 #include "ac3_decoder.h"
43 #include "ac3_decoder_thread.h" /* ac3dec_thread_t */
45 #include "ac3_internal.h" /* EXP_REUSE */
48 static const u16 nfchans[] = { 2, 1, 2, 3, 3, 4, 4, 5 };
56 static const struct frmsize_s frmsizecod_tbl[] =
58 { 32 ,{64 ,69 ,96 } },
59 { 32 ,{64 ,70 ,96 } },
60 { 40 ,{80 ,87 ,120 } },
61 { 40 ,{80 ,88 ,120 } },
62 { 48 ,{96 ,104 ,144 } },
63 { 48 ,{96 ,105 ,144 } },
64 { 56 ,{112 ,121 ,168 } },
65 { 56 ,{112 ,122 ,168 } },
66 { 64 ,{128 ,139 ,192 } },
67 { 64 ,{128 ,140 ,192 } },
68 { 80 ,{160 ,174 ,240 } },
69 { 80 ,{160 ,175 ,240 } },
70 { 96 ,{192 ,208 ,288 } },
71 { 96 ,{192 ,209 ,288 } },
72 { 112 ,{224 ,243 ,336 } },
73 { 112 ,{224 ,244 ,336 } },
74 { 128 ,{256 ,278 ,384 } },
75 { 128 ,{256 ,279 ,384 } },
76 { 160 ,{320 ,348 ,480 } },
77 { 160 ,{320 ,349 ,480 } },
78 { 192 ,{384 ,417 ,576 } },
79 { 192 ,{384 ,418 ,576 } },
80 { 224 ,{448 ,487 ,672 } },
81 { 224 ,{448 ,488 ,672 } },
82 { 256 ,{512 ,557 ,768 } },
83 { 256 ,{512 ,558 ,768 } },
84 { 320 ,{640 ,696 ,960 } },
85 { 320 ,{640 ,697 ,960 } },
86 { 384 ,{768 ,835 ,1152 } },
87 { 384 ,{768 ,836 ,1152 } },
88 { 448 ,{896 ,975 ,1344 } },
89 { 448 ,{896 ,976 ,1344 } },
90 { 512 ,{1024 ,1114 ,1536 } },
91 { 512 ,{1024 ,1115 ,1536 } },
92 { 576 ,{1152 ,1253 ,1728 } },
93 { 576 ,{1152 ,1254 ,1728 } },
94 { 640 ,{1280 ,1393 ,1920 } },
95 { 640 ,{1280 ,1394 ,1920 } }};
97 static const int fscod_tbl[] = {48000, 44100, 32000};
99 /* Some internal functions */
101 static void parse_bsi_stats (ac3dec_t * p_ac3dec);
102 static void parse_audblk_stats (ac3dec_t * p_ac3dec);
105 /* Parse a syncinfo structure */
106 int ac3_sync_frame (ac3dec_t * p_ac3dec, ac3_sync_info_t * p_sync_info)
108 ac3dec_thread_t * p_ac3dec_t = (ac3dec_thread_t *) p_ac3dec->bit_stream.p_callback_arg;
110 p_ac3dec->total_bits_read = 0;
111 p_ac3dec->i_available = 0;
113 /* sync word - should be 0x0b77 */
114 RealignBits(&p_ac3dec->bit_stream);
115 while( (ShowBits (&p_ac3dec->bit_stream,16)) != 0x0b77 &&
116 (!p_ac3dec_t->p_fifo->b_die) && (!p_ac3dec_t->p_fifo->b_error))
118 RemoveBits (&p_ac3dec->bit_stream,8);
119 p_ac3dec->total_bits_read += 8;
121 RemoveBits (&p_ac3dec->bit_stream,16);
122 p_ac3dec->total_bits_read += 16;
125 /* Get crc1 - we don't actually use this data though */
126 GetBits (&p_ac3dec->bit_stream,16);
128 /* Get the sampling rate */
129 p_ac3dec->syncinfo.fscod = GetBits (&p_ac3dec->bit_stream,2);
131 if (p_ac3dec->syncinfo.fscod >= 3)
133 p_ac3dec->total_bits_read += 34;
137 /* Get the frame size code */
138 p_ac3dec->syncinfo.frmsizecod = GetBits (&p_ac3dec->bit_stream,6);
139 p_ac3dec->total_bits_read += 40;
141 if (p_ac3dec->syncinfo.frmsizecod >= 38)
146 p_sync_info->bit_rate = frmsizecod_tbl[p_ac3dec->syncinfo.frmsizecod].bit_rate;
148 p_ac3dec->syncinfo.frame_size = frmsizecod_tbl[p_ac3dec->syncinfo.frmsizecod].frm_size[p_ac3dec->syncinfo.fscod];
149 p_sync_info->frame_size = 2 * p_ac3dec->syncinfo.frame_size;
151 p_sync_info->sample_rate = fscod_tbl[p_ac3dec->syncinfo.fscod];
157 * This routine fills a bsi struct from the AC3 stream
159 int parse_bsi (ac3dec_t * p_ac3dec)
161 /* Check the AC-3 version number */
162 p_ac3dec->bsi.bsid = GetBits (&p_ac3dec->bit_stream,5);
164 if (p_ac3dec->bsi.bsid > 8)
169 /* Get the audio service provided by the stream */
170 p_ac3dec->bsi.bsmod = GetBits (&p_ac3dec->bit_stream,3);
172 /* Get the audio coding mode (ie how many channels)*/
173 p_ac3dec->bsi.acmod = GetBits (&p_ac3dec->bit_stream,3);
175 /* Predecode the number of full bandwidth channels as we use this
177 p_ac3dec->bsi.nfchans = nfchans[p_ac3dec->bsi.acmod];
179 /* If it is in use, get the centre channel mix level */
180 if ((p_ac3dec->bsi.acmod & 0x1) && (p_ac3dec->bsi.acmod != 0x1))
182 p_ac3dec->bsi.cmixlev = GetBits (&p_ac3dec->bit_stream,2);
183 p_ac3dec->total_bits_read += 2;
186 /* If it is in use, get the surround channel mix level */
187 if (p_ac3dec->bsi.acmod & 0x4)
189 p_ac3dec->bsi.surmixlev = GetBits (&p_ac3dec->bit_stream,2);
190 p_ac3dec->total_bits_read += 2;
193 /* Get the dolby surround mode if in 2/0 mode */
194 if (p_ac3dec->bsi.acmod == 0x2)
196 p_ac3dec->bsi.dsurmod = GetBits (&p_ac3dec->bit_stream,2);
197 p_ac3dec->total_bits_read += 2;
200 /* Is the low frequency effects channel on? */
201 p_ac3dec->bsi.lfeon = GetBits (&p_ac3dec->bit_stream,1);
203 /* Get the dialogue normalization level */
204 p_ac3dec->bsi.dialnorm = GetBits (&p_ac3dec->bit_stream,5);
206 /* Does compression gain exist? */
207 if ((p_ac3dec->bsi.compre = GetBits (&p_ac3dec->bit_stream,1)))
209 /* Get compression gain */
210 p_ac3dec->bsi.compr = GetBits (&p_ac3dec->bit_stream,8);
211 p_ac3dec->total_bits_read += 8;
214 /* Does language code exist? */
215 if ((p_ac3dec->bsi.langcode = GetBits (&p_ac3dec->bit_stream,1)))
217 /* Get langauge code */
218 p_ac3dec->bsi.langcod = GetBits (&p_ac3dec->bit_stream,8);
219 p_ac3dec->total_bits_read += 8;
222 /* Does audio production info exist? */
223 if ((p_ac3dec->bsi.audprodie = GetBits (&p_ac3dec->bit_stream,1)))
226 p_ac3dec->bsi.mixlevel = GetBits (&p_ac3dec->bit_stream,5);
229 p_ac3dec->bsi.roomtyp = GetBits (&p_ac3dec->bit_stream,2);
230 p_ac3dec->total_bits_read += 7;
233 /* If we're in dual mono mode then get some extra info */
234 if (p_ac3dec->bsi.acmod == 0)
236 /* Get the dialogue normalization level two */
237 p_ac3dec->bsi.dialnorm2 = GetBits (&p_ac3dec->bit_stream,5);
239 /* Does compression gain two exist? */
240 if ((p_ac3dec->bsi.compr2e = GetBits (&p_ac3dec->bit_stream,1)))
242 /* Get compression gain two */
243 p_ac3dec->bsi.compr2 = GetBits (&p_ac3dec->bit_stream,8);
244 p_ac3dec->total_bits_read += 8;
247 /* Does language code two exist? */
248 if ((p_ac3dec->bsi.langcod2e = GetBits (&p_ac3dec->bit_stream,1)))
250 /* Get langauge code two */
251 p_ac3dec->bsi.langcod2 = GetBits (&p_ac3dec->bit_stream,8);
252 p_ac3dec->total_bits_read += 8;
255 /* Does audio production info two exist? */
256 if ((p_ac3dec->bsi.audprodi2e = GetBits (&p_ac3dec->bit_stream,1)))
258 /* Get mix level two */
259 p_ac3dec->bsi.mixlevel2 = GetBits (&p_ac3dec->bit_stream,5);
261 /* Get room type two */
262 p_ac3dec->bsi.roomtyp2 = GetBits (&p_ac3dec->bit_stream,2);
263 p_ac3dec->total_bits_read += 7;
265 p_ac3dec->total_bits_read += 8;
268 /* Get the copyright bit */
269 p_ac3dec->bsi.copyrightb = GetBits (&p_ac3dec->bit_stream,1);
271 /* Get the original bit */
272 p_ac3dec->bsi.origbs = GetBits (&p_ac3dec->bit_stream,1);
274 /* Does timecode one exist? */
275 if ((p_ac3dec->bsi.timecod1e = GetBits (&p_ac3dec->bit_stream,1)))
277 p_ac3dec->bsi.timecod1 = GetBits (&p_ac3dec->bit_stream,14);
278 p_ac3dec->total_bits_read += 14;
281 /* Does timecode two exist? */
282 if ((p_ac3dec->bsi.timecod2e = GetBits (&p_ac3dec->bit_stream,1)))
284 p_ac3dec->bsi.timecod2 = GetBits (&p_ac3dec->bit_stream,14);
285 p_ac3dec->total_bits_read += 14;
288 /* Does addition info exist? */
289 if ((p_ac3dec->bsi.addbsie = GetBits (&p_ac3dec->bit_stream,1)))
293 /* Get how much info is there */
294 p_ac3dec->bsi.addbsil = GetBits (&p_ac3dec->bit_stream,6);
296 /* Get the additional info */
297 for (i=0;i<(p_ac3dec->bsi.addbsil + 1);i++)
299 p_ac3dec->bsi.addbsi[i] = GetBits (&p_ac3dec->bit_stream,8);
301 p_ac3dec->total_bits_read += 6 + 8 * (p_ac3dec->bsi.addbsil + 1);
303 p_ac3dec->total_bits_read += 25;
306 parse_bsi_stats (p_ac3dec);
312 /* More pain inducing parsing */
313 int parse_audblk (ac3dec_t * p_ac3dec, int blknum)
317 for (i=0; i < p_ac3dec->bsi.nfchans; i++)
319 /* Is this channel an interleaved 256 + 256 block ? */
320 p_ac3dec->audblk.blksw[i] = GetBits (&p_ac3dec->bit_stream,1);
323 for (i=0; i < p_ac3dec->bsi.nfchans; i++)
325 /* Should we dither this channel? */
326 p_ac3dec->audblk.dithflag[i] = GetBits (&p_ac3dec->bit_stream,1);
329 /* Does dynamic range control exist? */
330 if ((p_ac3dec->audblk.dynrnge = GetBits (&p_ac3dec->bit_stream,1)))
332 /* Get dynamic range info */
333 p_ac3dec->audblk.dynrng = GetBits (&p_ac3dec->bit_stream,8);
334 p_ac3dec->total_bits_read += 8;
337 /* If we're in dual mono mode then get the second channel DR info */
338 if (p_ac3dec->bsi.acmod == 0)
340 /* Does dynamic range control two exist? */
341 if ((p_ac3dec->audblk.dynrng2e = GetBits (&p_ac3dec->bit_stream,1)))
343 /* Get dynamic range info */
344 p_ac3dec->audblk.dynrng2 = GetBits (&p_ac3dec->bit_stream,8);
345 p_ac3dec->total_bits_read += 8;
347 p_ac3dec->total_bits_read += 1;
350 /* Does coupling strategy exist? */
351 p_ac3dec->audblk.cplstre = GetBits (&p_ac3dec->bit_stream,1);
352 p_ac3dec->total_bits_read += 2 + 2 * p_ac3dec->bsi.nfchans;
354 if ((!blknum) && (!p_ac3dec->audblk.cplstre))
359 if (p_ac3dec->audblk.cplstre)
361 /* Is coupling turned on? */
362 if ((p_ac3dec->audblk.cplinu = GetBits (&p_ac3dec->bit_stream,1)))
364 int nb_coupled_channels;
366 nb_coupled_channels = 0;
367 for (i=0; i < p_ac3dec->bsi.nfchans; i++)
369 p_ac3dec->audblk.chincpl[i] = GetBits (&p_ac3dec->bit_stream,1);
370 if (p_ac3dec->audblk.chincpl[i])
372 nb_coupled_channels++;
375 p_ac3dec->total_bits_read += p_ac3dec->bsi.nfchans;
377 if (nb_coupled_channels < 2)
382 if (p_ac3dec->bsi.acmod == 0x2)
384 p_ac3dec->audblk.phsflginu = GetBits (&p_ac3dec->bit_stream,1);
385 p_ac3dec->total_bits_read += 1;
387 p_ac3dec->audblk.cplbegf = GetBits (&p_ac3dec->bit_stream,4);
388 p_ac3dec->audblk.cplendf = GetBits (&p_ac3dec->bit_stream,4);
389 p_ac3dec->total_bits_read += 8;
391 if (p_ac3dec->audblk.cplbegf > p_ac3dec->audblk.cplendf + 2)
396 p_ac3dec->audblk.ncplsubnd = (p_ac3dec->audblk.cplendf + 2) - p_ac3dec->audblk.cplbegf + 1;
398 /* Calculate the start and end bins of the coupling channel */
399 p_ac3dec->audblk.cplstrtmant = (p_ac3dec->audblk.cplbegf * 12) + 37 ;
400 p_ac3dec->audblk.cplendmant = ((p_ac3dec->audblk.cplendf + 3) * 12) + 37;
402 /* The number of combined subbands is ncplsubnd minus each combined
404 p_ac3dec->audblk.ncplbnd = p_ac3dec->audblk.ncplsubnd;
406 for (i=1; i< p_ac3dec->audblk.ncplsubnd; i++)
408 p_ac3dec->audblk.cplbndstrc[i] = GetBits (&p_ac3dec->bit_stream,1);
409 p_ac3dec->audblk.ncplbnd -= p_ac3dec->audblk.cplbndstrc[i];
411 p_ac3dec->total_bits_read += p_ac3dec->audblk.ncplsubnd - 1;
413 p_ac3dec->total_bits_read += 1;
416 if (p_ac3dec->audblk.cplinu)
418 /* Loop through all the channels and get their coupling co-ords */
419 for (i=0; i < p_ac3dec->bsi.nfchans;i++)
421 if (!p_ac3dec->audblk.chincpl[i])
426 /* Is there new coupling co-ordinate info? */
427 p_ac3dec->audblk.cplcoe[i] = GetBits (&p_ac3dec->bit_stream,1);
429 if ((!blknum) && (!p_ac3dec->audblk.cplcoe[i]))
434 if (p_ac3dec->audblk.cplcoe[i])
436 p_ac3dec->audblk.mstrcplco[i] = GetBits (&p_ac3dec->bit_stream,2);
437 p_ac3dec->total_bits_read += 2;
438 for (j=0;j < p_ac3dec->audblk.ncplbnd; j++)
440 p_ac3dec->audblk.cplcoexp[i][j] = GetBits (&p_ac3dec->bit_stream,4);
441 p_ac3dec->audblk.cplcomant[i][j] = GetBits (&p_ac3dec->bit_stream,4);
443 p_ac3dec->total_bits_read += 8 * p_ac3dec->audblk.ncplbnd;
446 p_ac3dec->total_bits_read += p_ac3dec->bsi.nfchans;
448 /* If we're in dual mono mode, there's going to be some phase info */
449 if ((p_ac3dec->bsi.acmod == 0x2) && p_ac3dec->audblk.phsflginu &&
450 (p_ac3dec->audblk.cplcoe[0] || p_ac3dec->audblk.cplcoe[1]))
452 for (j=0; j < p_ac3dec->audblk.ncplbnd; j++)
454 p_ac3dec->audblk.phsflg[j] = GetBits (&p_ac3dec->bit_stream,1);
456 p_ac3dec->total_bits_read += p_ac3dec->audblk.ncplbnd;
461 /* If we're in dual mono mode, there may be a rematrix strategy */
462 if (p_ac3dec->bsi.acmod == 0x2)
464 p_ac3dec->audblk.rematstr = GetBits (&p_ac3dec->bit_stream,1);
465 p_ac3dec->total_bits_read += 1;
467 if ((!blknum) && (!p_ac3dec->audblk.rematstr))
472 if (p_ac3dec->audblk.rematstr)
474 if (p_ac3dec->audblk.cplinu == 0)
476 for (i = 0; i < 4; i++)
478 p_ac3dec->audblk.rematflg[i] = GetBits (&p_ac3dec->bit_stream,1);
480 p_ac3dec->total_bits_read += 4;
482 if ((p_ac3dec->audblk.cplbegf > 2) && p_ac3dec->audblk.cplinu)
484 for (i = 0; i < 4; i++)
486 p_ac3dec->audblk.rematflg[i] = GetBits (&p_ac3dec->bit_stream,1);
488 p_ac3dec->total_bits_read += 4;
490 if ((p_ac3dec->audblk.cplbegf <= 2) && p_ac3dec->audblk.cplinu)
492 for (i = 0; i < 3; i++)
494 p_ac3dec->audblk.rematflg[i] = GetBits (&p_ac3dec->bit_stream,1);
496 p_ac3dec->total_bits_read += 3;
498 if ((p_ac3dec->audblk.cplbegf == 0) && p_ac3dec->audblk.cplinu)
500 for (i = 0; i < 2; i++)
502 p_ac3dec->audblk.rematflg[i] = GetBits (&p_ac3dec->bit_stream,1);
504 p_ac3dec->total_bits_read += 2;
509 if (p_ac3dec->audblk.cplinu)
511 /* Get the coupling channel exponent strategy */
512 p_ac3dec->audblk.cplexpstr = GetBits (&p_ac3dec->bit_stream,2);
513 p_ac3dec->total_bits_read += 2;
515 if ((!blknum) && (p_ac3dec->audblk.cplexpstr == EXP_REUSE))
520 if (p_ac3dec->audblk.cplexpstr==0)
522 p_ac3dec->audblk.ncplgrps = 0;
526 p_ac3dec->audblk.ncplgrps = (p_ac3dec->audblk.cplendmant - p_ac3dec->audblk.cplstrtmant) /
527 (3 << (p_ac3dec->audblk.cplexpstr-1));
532 for (i = 0; i < p_ac3dec->bsi.nfchans; i++)
534 p_ac3dec->audblk.chexpstr[i] = GetBits (&p_ac3dec->bit_stream,2);
535 p_ac3dec->total_bits_read += 2;
537 if ((!blknum) && (p_ac3dec->audblk.chexpstr[i] == EXP_REUSE))
543 /* Get the exponent strategy for lfe channel */
544 if (p_ac3dec->bsi.lfeon)
546 p_ac3dec->audblk.lfeexpstr = GetBits (&p_ac3dec->bit_stream,1);
547 p_ac3dec->total_bits_read += 1;
549 if ((!blknum) && (p_ac3dec->audblk.lfeexpstr == EXP_REUSE))
555 /* Determine the bandwidths of all the fbw channels */
556 for (i = 0; i < p_ac3dec->bsi.nfchans; i++)
560 if (p_ac3dec->audblk.chexpstr[i] != EXP_REUSE)
562 if (p_ac3dec->audblk.cplinu && p_ac3dec->audblk.chincpl[i])
564 p_ac3dec->audblk.endmant[i] = p_ac3dec->audblk.cplstrtmant;
568 p_ac3dec->audblk.chbwcod[i] = GetBits (&p_ac3dec->bit_stream,6);
569 p_ac3dec->total_bits_read += 6;
571 if (p_ac3dec->audblk.chbwcod[i] > 60)
576 p_ac3dec->audblk.endmant[i] = ((p_ac3dec->audblk.chbwcod[i] + 12) * 3) + 37;
579 /* Calculate the number of exponent groups to fetch */
580 grp_size = 3 * (1 << (p_ac3dec->audblk.chexpstr[i] - 1));
581 p_ac3dec->audblk.nchgrps[i] = (p_ac3dec->audblk.endmant[i] - 1 + (grp_size - 3)) / grp_size;
585 /* Get the coupling exponents if they exist */
586 if (p_ac3dec->audblk.cplinu && (p_ac3dec->audblk.cplexpstr != EXP_REUSE))
588 p_ac3dec->audblk.cplabsexp = GetBits (&p_ac3dec->bit_stream,4);
589 p_ac3dec->total_bits_read += 4;
590 for (i=0; i< p_ac3dec->audblk.ncplgrps;i++)
592 p_ac3dec->audblk.cplexps[i] = GetBits (&p_ac3dec->bit_stream,7);
593 p_ac3dec->total_bits_read += 7;
595 if (p_ac3dec->audblk.cplexps[i] >= 125)
602 /* Get the fwb channel exponents */
603 for (i=0; i < p_ac3dec->bsi.nfchans; i++)
605 if (p_ac3dec->audblk.chexpstr[i] != EXP_REUSE)
607 p_ac3dec->audblk.exps[i][0] = GetBits (&p_ac3dec->bit_stream,4);
608 p_ac3dec->total_bits_read += 4;
609 for (j=1; j<=p_ac3dec->audblk.nchgrps[i];j++)
611 p_ac3dec->audblk.exps[i][j] = GetBits (&p_ac3dec->bit_stream,7);
612 p_ac3dec->total_bits_read += 7;
613 if (p_ac3dec->audblk.exps[i][j] >= 125)
618 p_ac3dec->audblk.gainrng[i] = GetBits (&p_ac3dec->bit_stream,2);
619 p_ac3dec->total_bits_read += 2;
623 /* Get the lfe channel exponents */
624 if (p_ac3dec->bsi.lfeon && (p_ac3dec->audblk.lfeexpstr != EXP_REUSE))
626 p_ac3dec->audblk.lfeexps[0] = GetBits (&p_ac3dec->bit_stream,4);
627 p_ac3dec->audblk.lfeexps[1] = GetBits (&p_ac3dec->bit_stream,7);
628 p_ac3dec->total_bits_read += 11;
629 if (p_ac3dec->audblk.lfeexps[1] >= 125)
633 p_ac3dec->audblk.lfeexps[2] = GetBits (&p_ac3dec->bit_stream,7);
634 p_ac3dec->total_bits_read += 7;
635 if (p_ac3dec->audblk.lfeexps[2] >= 125)
641 /* Get the parametric bit allocation parameters */
642 p_ac3dec->audblk.baie = GetBits (&p_ac3dec->bit_stream,1);
643 p_ac3dec->total_bits_read += 1;
645 if ((!blknum) && (!p_ac3dec->audblk.baie))
650 if (p_ac3dec->audblk.baie)
652 p_ac3dec->audblk.sdcycod = GetBits (&p_ac3dec->bit_stream,2);
653 p_ac3dec->audblk.fdcycod = GetBits (&p_ac3dec->bit_stream,2);
654 p_ac3dec->audblk.sgaincod = GetBits (&p_ac3dec->bit_stream,2);
655 p_ac3dec->audblk.dbpbcod = GetBits (&p_ac3dec->bit_stream,2);
656 p_ac3dec->audblk.floorcod = GetBits (&p_ac3dec->bit_stream,3);
657 p_ac3dec->total_bits_read += 11;
660 /* Get the SNR off set info if it exists */
661 p_ac3dec->audblk.snroffste = GetBits (&p_ac3dec->bit_stream,1);
662 if ((!blknum) && (!p_ac3dec->audblk.snroffste))
667 if (p_ac3dec->audblk.snroffste)
669 p_ac3dec->audblk.csnroffst = GetBits (&p_ac3dec->bit_stream,6);
670 p_ac3dec->total_bits_read += 6;
672 if (p_ac3dec->audblk.cplinu)
674 p_ac3dec->audblk.cplfsnroffst = GetBits (&p_ac3dec->bit_stream,4);
675 p_ac3dec->audblk.cplfgaincod = GetBits (&p_ac3dec->bit_stream,3);
676 p_ac3dec->total_bits_read += 7;
679 for (i = 0;i < p_ac3dec->bsi.nfchans; i++)
681 p_ac3dec->audblk.fsnroffst[i] = GetBits (&p_ac3dec->bit_stream,4);
682 p_ac3dec->audblk.fgaincod[i] = GetBits (&p_ac3dec->bit_stream,3);
684 p_ac3dec->total_bits_read += 7 * p_ac3dec->bsi.nfchans;
685 if (p_ac3dec->bsi.lfeon)
687 p_ac3dec->audblk.lfefsnroffst = GetBits (&p_ac3dec->bit_stream,4);
688 p_ac3dec->audblk.lfefgaincod = GetBits (&p_ac3dec->bit_stream,3);
689 p_ac3dec->total_bits_read += 7;
693 /* Get coupling leakage info if it exists */
694 if (p_ac3dec->audblk.cplinu)
696 p_ac3dec->audblk.cplleake = GetBits (&p_ac3dec->bit_stream,1);
697 p_ac3dec->total_bits_read += 1;
698 if ((!blknum) && (!p_ac3dec->audblk.cplleake))
703 if (p_ac3dec->audblk.cplleake)
705 p_ac3dec->audblk.cplfleak = GetBits (&p_ac3dec->bit_stream,3);
706 p_ac3dec->audblk.cplsleak = GetBits (&p_ac3dec->bit_stream,3);
707 p_ac3dec->total_bits_read += 6;
711 /* Get the delta bit alloaction info */
712 p_ac3dec->audblk.deltbaie = GetBits (&p_ac3dec->bit_stream,1);
713 p_ac3dec->total_bits_read += 1;
715 if (p_ac3dec->audblk.deltbaie)
717 if (p_ac3dec->audblk.cplinu)
719 p_ac3dec->audblk.cpldeltbae = GetBits (&p_ac3dec->bit_stream,2);
720 p_ac3dec->total_bits_read += 2;
721 if (p_ac3dec->audblk.cpldeltbae == 3)
727 for (i = 0;i < p_ac3dec->bsi.nfchans; i++)
729 p_ac3dec->audblk.deltbae[i] = GetBits (&p_ac3dec->bit_stream,2);
730 p_ac3dec->total_bits_read += 2;
731 if (p_ac3dec->audblk.deltbae[i] == 3)
737 if (p_ac3dec->audblk.cplinu && (p_ac3dec->audblk.cpldeltbae == DELTA_BIT_NEW))
739 p_ac3dec->audblk.cpldeltnseg = GetBits (&p_ac3dec->bit_stream,3);
740 for (i = 0;i < p_ac3dec->audblk.cpldeltnseg + 1; i++)
742 p_ac3dec->audblk.cpldeltoffst[i] = GetBits (&p_ac3dec->bit_stream,5);
743 p_ac3dec->audblk.cpldeltlen[i] = GetBits (&p_ac3dec->bit_stream,4);
744 p_ac3dec->audblk.cpldeltba[i] = GetBits (&p_ac3dec->bit_stream,3);
746 p_ac3dec->total_bits_read += 12 * (p_ac3dec->audblk.cpldeltnseg + 1) + 3;
749 for (i = 0; i < p_ac3dec->bsi.nfchans; i++)
751 if (p_ac3dec->audblk.deltbae[i] == DELTA_BIT_NEW)
753 p_ac3dec->audblk.deltnseg[i] = GetBits (&p_ac3dec->bit_stream,3);
754 // if (p_ac3dec->audblk.deltnseg[i] >= 8)
755 // fprintf (stderr, "parse debug: p_ac3dec->audblk.deltnseg[%i] == %i\n", i, p_ac3dec->audblk.deltnseg[i]);
756 for (j = 0; j < p_ac3dec->audblk.deltnseg[i] + 1; j++)
758 p_ac3dec->audblk.deltoffst[i][j] = GetBits (&p_ac3dec->bit_stream,5);
759 p_ac3dec->audblk.deltlen[i][j] = GetBits (&p_ac3dec->bit_stream,4);
760 p_ac3dec->audblk.deltba[i][j] = GetBits (&p_ac3dec->bit_stream,3);
762 p_ac3dec->total_bits_read += 12 * (p_ac3dec->audblk.deltnseg[i] + 1) + 3;
767 /* Check to see if there's any dummy info to get */
768 p_ac3dec->audblk.skiple = GetBits (&p_ac3dec->bit_stream,1);
769 p_ac3dec->total_bits_read += 1;
771 if (p_ac3dec->audblk.skiple)
773 p_ac3dec->audblk.skipl = GetBits (&p_ac3dec->bit_stream,9);
775 for (i = 0; i < p_ac3dec->audblk.skipl ; i++)
777 GetBits (&p_ac3dec->bit_stream,8);
779 p_ac3dec->total_bits_read += 8 * p_ac3dec->audblk.skipl + 9;
783 parse_audblk_stats(p_ac3dec);
789 void parse_auxdata (ac3dec_t * p_ac3dec)
794 skip_length = (p_ac3dec->syncinfo.frame_size * 16) - p_ac3dec->total_bits_read - 17 - 1;
796 for (i = 0; i < skip_length; i++)
798 RemoveBits (&p_ac3dec->bit_stream,1);
801 /* get the auxdata exists bit */
802 RemoveBits (&p_ac3dec->bit_stream,1);
804 /* Skip the CRC reserved bit */
805 RemoveBits (&p_ac3dec->bit_stream,1);
808 RemoveBits (&p_ac3dec->bit_stream,16);
812 static void parse_bsi_stats (ac3dec_t * p_ac3dec) /* Some stats */
819 static const char *service_ids[8] =
825 static const struct mixlev_s cmixlev_tbl[4] =
827 {0.707, "(-3.0 dB)"}, {0.595, "(-4.5 dB)"},
828 {0.500, "(-6.0 dB)"}, {1.0, "Invalid"}
830 static const struct mixlev_s smixlev_tbl[4] =
832 {0.707, "(-3.0 dB)"}, {0.500, "(-6.0 dB)"},
833 { 0.0, "off "}, { 1.0, "Invalid"}
841 /* if ((p_ac3dec->bsi.acmod & 0x1) && (p_ac3dec->bsi.acmod != 0x1))
842 printf("CentreMixLevel %s ",cmixlev_tbl[p_ac3dec->bsi.cmixlev].desc);
843 if (p_ac3dec->bsi.acmod & 0x4)
844 printf("SurMixLevel %s",smixlev_tbl[p_ac3dec->bsi.cmixlev].desc);
846 intf_Msg ( "(ac3dec_parsebsi) %s %d.%d Mode",
847 service_ids[p_ac3dec->bsi.bsmod],
848 p_ac3dec->bsi.nfchans,p_ac3dec->bsi.lfeon);
856 static void parse_audblk_stats (ac3dec_t * p_ac3dec)
858 char *exp_strat_tbl[4] = {"R ","D15 ","D25 ","D45 "};
861 intf_ErrMsg ("(ac3dec_parseaudblk) ");
862 intf_ErrMsg ("%s ",p_ac3dec->audblk.cplinu ? "cpl on" : "cpl off");
863 intf_ErrMsg ("%s ",p_ac3dec->audblk.baie? "bai" : " ");
864 intf_ErrMsg ("%s ",p_ac3dec->audblk.snroffste? "snroffst" : " ");
865 intf_ErrMsg ("%s ",p_ac3dec->audblk.deltbaie? "deltba" : " ");
866 intf_ErrMsg ("%s ",p_ac3dec->audblk.phsflginu? "phsflg" : " ");
867 intf_ErrMsg ("(%s %s %s %s %s) ",exp_strat_tbl[p_ac3dec->audblk.chexpstr[0]],
868 exp_strat_tbl[p_ac3dec->audblk.chexpstr[1]],exp_strat_tbl[p_ac3dec->audblk.chexpstr[2]],
869 exp_strat_tbl[p_ac3dec->audblk.chexpstr[3]],exp_strat_tbl[p_ac3dec->audblk.chexpstr[4]]);
871 for(i=0;i<p_ac3dec->bsi.nfchans;i++)
872 intf_ErrMsg ("%1d",p_ac3dec->audblk.blksw[i]);