Add const where appropriate, also gets rid of a compiler warning.
[mplayer/glamo.git] / liba52 / parse.c
blobcba5b80ff7897a01b87597ae9635bd8d2fb5742a
1 /*
2 * parse.c
3 * Copyright (C) 2000-2002 Michel Lespinasse <walken@zoy.org>
4 * Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
6 * This file is part of a52dec, a free ATSC A-52 stream decoder.
7 * See http://liba52.sourceforge.net/ for updates.
9 * Modified for use with MPlayer, changes contained in liba52_changes.diff.
10 * detailed changelog at http://svn.mplayerhq.hu/mplayer/trunk/
11 * $Id$
13 * a52dec is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
18 * a52dec is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
28 #include "config.h"
30 #include <stdlib.h>
31 #include <stdio.h>
32 #include <string.h>
33 #include <inttypes.h>
35 #include "a52.h"
36 #include "a52_internal.h"
37 #include "bitstream.h"
38 #include "tables.h"
39 #include "mm_accel.h"
40 #include "libavutil/avutil.h"
42 #if HAVE_MEMALIGN
43 /* some systems have memalign() but no declaration for it */
44 void * memalign (size_t align, size_t size);
45 #endif
47 typedef struct {
48 sample_t q1[2];
49 sample_t q2[2];
50 sample_t q4;
51 int q1_ptr;
52 int q2_ptr;
53 int q4_ptr;
54 } quantizer_t;
56 static uint8_t halfrate[12] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3};
58 a52_state_t * a52_init (uint32_t mm_accel)
60 a52_state_t * state;
61 int i;
63 state = malloc (sizeof (a52_state_t));
64 if (state == NULL)
65 return NULL;
67 #if defined(__MINGW32__) && defined(HAVE_SSE)
68 state->samples = av_malloc(256 * 12 * sizeof (sample_t));
69 #else
70 state->samples = memalign (16, 256 * 12 * sizeof (sample_t));
71 #endif
72 if(((int)state->samples%16) && (mm_accel&MM_ACCEL_X86_SSE)){
73 mm_accel &=~MM_ACCEL_X86_SSE;
74 fprintf(stderr, "liba52: unable to get 16 byte aligned memory disabling usage of SSE instructions\n");
77 if (state->samples == NULL) {
78 free (state);
79 return NULL;
82 for (i = 0; i < 256 * 12; i++)
83 state->samples[i] = 0;
85 state->downmixed = 1;
87 state->lfsr_state = 1;
89 a52_imdct_init (mm_accel);
90 downmix_accel_init(mm_accel);
92 return state;
95 sample_t * a52_samples (a52_state_t * state)
97 return state->samples;
100 int a52_syncinfo (uint8_t * buf, int * flags,
101 int * sample_rate, int * bit_rate)
103 static int rate[] = { 32, 40, 48, 56, 64, 80, 96, 112,
104 128, 160, 192, 224, 256, 320, 384, 448,
105 512, 576, 640};
106 static uint8_t lfeon[8] = {0x10, 0x10, 0x04, 0x04, 0x04, 0x01, 0x04, 0x01};
107 int frmsizecod;
108 int bitrate;
109 int half;
110 int acmod;
112 if ((buf[0] != 0x0b) || (buf[1] != 0x77)) /* syncword */
113 return 0;
115 if (buf[5] >= 0x60) /* bsid >= 12 */
116 return 0;
117 half = halfrate[buf[5] >> 3];
119 /* acmod, dsurmod and lfeon */
120 acmod = buf[6] >> 5;
121 *flags = ((((buf[6] & 0xf8) == 0x50) ? A52_DOLBY : acmod) |
122 ((buf[6] & lfeon[acmod]) ? A52_LFE : 0));
124 frmsizecod = buf[4] & 63;
125 if (frmsizecod >= 38)
126 return 0;
127 bitrate = rate [frmsizecod >> 1];
128 *bit_rate = (bitrate * 1000) >> half;
130 switch (buf[4] & 0xc0) {
131 case 0:
132 *sample_rate = 48000 >> half;
133 return 4 * bitrate;
134 case 0x40:
135 *sample_rate = 44100 >> half;
136 return 2 * (320 * bitrate / 147 + (frmsizecod & 1));
137 case 0x80:
138 *sample_rate = 32000 >> half;
139 return 6 * bitrate;
140 default:
141 return 0;
145 int a52_frame (a52_state_t * state, uint8_t * buf, int * flags,
146 sample_t * level, sample_t bias)
148 static sample_t clev[4] = {LEVEL_3DB, LEVEL_45DB, LEVEL_6DB, LEVEL_45DB};
149 static sample_t slev[4] = {LEVEL_3DB, LEVEL_6DB, 0, LEVEL_6DB};
150 int chaninfo;
151 int acmod;
153 state->fscod = buf[4] >> 6;
154 state->halfrate = halfrate[buf[5] >> 3];
155 state->acmod = acmod = buf[6] >> 5;
157 a52_bitstream_set_ptr (state, buf + 6);
158 bitstream_skip (state, 3); /* skip acmod we already parsed */
160 if ((acmod == 2) && (bitstream_get (state, 2) == 2)) /* dsurmod */
161 acmod = A52_DOLBY;
163 if ((acmod & 1) && (acmod != 1))
164 state->clev = clev[bitstream_get (state, 2)]; /* cmixlev */
166 if (acmod & 4)
167 state->slev = slev[bitstream_get (state, 2)]; /* surmixlev */
169 state->lfeon = bitstream_get (state, 1);
171 state->output = a52_downmix_init (acmod, *flags, level,
172 state->clev, state->slev);
173 if (state->output < 0)
174 return 1;
175 if (state->lfeon && (*flags & A52_LFE))
176 state->output |= A52_LFE;
177 *flags = state->output;
178 /* the 2* compensates for differences in imdct */
179 state->dynrng = state->level = 2 * *level;
180 state->bias = bias;
181 state->dynrnge = 1;
182 state->dynrngcall = NULL;
183 state->cplba.deltbae = DELTA_BIT_NONE;
184 state->ba[0].deltbae = state->ba[1].deltbae = state->ba[2].deltbae =
185 state->ba[3].deltbae = state->ba[4].deltbae = DELTA_BIT_NONE;
187 chaninfo = !acmod;
188 do {
189 bitstream_skip (state, 5); /* dialnorm */
190 if (bitstream_get (state, 1)) /* compre */
191 bitstream_skip (state, 8); /* compr */
192 if (bitstream_get (state, 1)) /* langcode */
193 bitstream_skip (state, 8); /* langcod */
194 if (bitstream_get (state, 1)) /* audprodie */
195 bitstream_skip (state, 7); /* mixlevel + roomtyp */
196 } while (chaninfo--);
198 bitstream_skip (state, 2); /* copyrightb + origbs */
200 if (bitstream_get (state, 1)) /* timecod1e */
201 bitstream_skip (state, 14); /* timecod1 */
202 if (bitstream_get (state, 1)) /* timecod2e */
203 bitstream_skip (state, 14); /* timecod2 */
205 if (bitstream_get (state, 1)) { /* addbsie */
206 int addbsil;
208 addbsil = bitstream_get (state, 6);
209 do {
210 bitstream_skip (state, 8); /* addbsi */
211 } while (addbsil--);
214 return 0;
217 void a52_dynrng (a52_state_t * state,
218 sample_t (* call) (sample_t, void *), void * data)
220 state->dynrnge = 0;
221 if (call) {
222 state->dynrnge = 1;
223 state->dynrngcall = call;
224 state->dynrngdata = data;
228 static int parse_exponents (a52_state_t * state, int expstr, int ngrps,
229 uint8_t exponent, uint8_t * dest)
231 int exps;
233 while (ngrps--) {
234 exps = bitstream_get (state, 7);
236 exponent += exp_1[exps];
237 if (exponent > 24)
238 return 1;
240 switch (expstr) {
241 case EXP_D45:
242 *(dest++) = exponent;
243 *(dest++) = exponent;
244 case EXP_D25:
245 *(dest++) = exponent;
246 case EXP_D15:
247 *(dest++) = exponent;
250 exponent += exp_2[exps];
251 if (exponent > 24)
252 return 1;
254 switch (expstr) {
255 case EXP_D45:
256 *(dest++) = exponent;
257 *(dest++) = exponent;
258 case EXP_D25:
259 *(dest++) = exponent;
260 case EXP_D15:
261 *(dest++) = exponent;
264 exponent += exp_3[exps];
265 if (exponent > 24)
266 return 1;
268 switch (expstr) {
269 case EXP_D45:
270 *(dest++) = exponent;
271 *(dest++) = exponent;
272 case EXP_D25:
273 *(dest++) = exponent;
274 case EXP_D15:
275 *(dest++) = exponent;
279 return 0;
282 static int parse_deltba (a52_state_t * state, int8_t * deltba)
284 int deltnseg, deltlen, delta, j;
286 memset (deltba, 0, 50);
288 deltnseg = bitstream_get (state, 3);
289 j = 0;
290 do {
291 j += bitstream_get (state, 5);
292 deltlen = bitstream_get (state, 4);
293 delta = bitstream_get (state, 3);
294 delta -= (delta >= 4) ? 3 : 4;
295 if (!deltlen)
296 continue;
297 if (j + deltlen >= 50)
298 return 1;
299 while (deltlen--)
300 deltba[j++] = delta;
301 } while (deltnseg--);
303 return 0;
306 static inline int zero_snr_offsets (int nfchans, a52_state_t * state)
308 int i;
310 if ((state->csnroffst) ||
311 (state->chincpl && state->cplba.bai >> 3) || /* cplinu, fsnroffst */
312 (state->lfeon && state->lfeba.bai >> 3)) /* fsnroffst */
313 return 0;
314 for (i = 0; i < nfchans; i++)
315 if (state->ba[i].bai >> 3) /* fsnroffst */
316 return 0;
317 return 1;
320 static inline int16_t dither_gen (a52_state_t * state)
322 int16_t nstate;
324 nstate = dither_lut[state->lfsr_state >> 8] ^ (state->lfsr_state << 8);
326 state->lfsr_state = (uint16_t) nstate;
328 return nstate;
331 static void coeff_get (a52_state_t * state, sample_t * coeff,
332 expbap_t * expbap, quantizer_t * quantizer,
333 sample_t level, int dither, int end)
335 int i;
336 uint8_t * exp;
337 int8_t * bap;
338 sample_t factor[25];
340 for (i = 0; i <= 24; i++)
341 factor[i] = scale_factor[i] * level;
343 exp = expbap->exp;
344 bap = expbap->bap;
346 for (i = 0; i < end; i++) {
347 int bapi;
349 bapi = bap[i];
350 switch (bapi) {
351 case 0:
352 if (dither) {
353 coeff[i] = dither_gen (state) * LEVEL_3DB * factor[exp[i]];
354 continue;
355 } else {
356 coeff[i] = 0;
357 continue;
360 case -1:
361 if (quantizer->q1_ptr >= 0) {
362 coeff[i] = quantizer->q1[quantizer->q1_ptr--] * factor[exp[i]];
363 continue;
364 } else {
365 int code;
367 code = bitstream_get (state, 5);
369 quantizer->q1_ptr = 1;
370 quantizer->q1[0] = q_1_2[code];
371 quantizer->q1[1] = q_1_1[code];
372 coeff[i] = q_1_0[code] * factor[exp[i]];
373 continue;
376 case -2:
377 if (quantizer->q2_ptr >= 0) {
378 coeff[i] = quantizer->q2[quantizer->q2_ptr--] * factor[exp[i]];
379 continue;
380 } else {
381 int code;
383 code = bitstream_get (state, 7);
385 quantizer->q2_ptr = 1;
386 quantizer->q2[0] = q_2_2[code];
387 quantizer->q2[1] = q_2_1[code];
388 coeff[i] = q_2_0[code] * factor[exp[i]];
389 continue;
392 case 3:
393 coeff[i] = q_3[bitstream_get (state, 3)] * factor[exp[i]];
394 continue;
396 case -3:
397 if (quantizer->q4_ptr == 0) {
398 quantizer->q4_ptr = -1;
399 coeff[i] = quantizer->q4 * factor[exp[i]];
400 continue;
401 } else {
402 int code;
404 code = bitstream_get (state, 7);
406 quantizer->q4_ptr = 0;
407 quantizer->q4 = q_4_1[code];
408 coeff[i] = q_4_0[code] * factor[exp[i]];
409 continue;
412 case 4:
413 coeff[i] = q_5[bitstream_get (state, 4)] * factor[exp[i]];
414 continue;
416 default:
417 coeff[i] = ((bitstream_get_2 (state, bapi) << (16 - bapi)) *
418 factor[exp[i]]);
423 static void coeff_get_coupling (a52_state_t * state, int nfchans,
424 sample_t * coeff, sample_t (* samples)[256],
425 quantizer_t * quantizer, uint8_t dithflag[5])
427 int cplbndstrc, bnd, i, i_end, ch;
428 uint8_t * exp;
429 int8_t * bap;
430 sample_t cplco[5];
432 exp = state->cpl_expbap.exp;
433 bap = state->cpl_expbap.bap;
434 bnd = 0;
435 cplbndstrc = state->cplbndstrc;
436 i = state->cplstrtmant;
437 while (i < state->cplendmant) {
438 i_end = i + 12;
439 while (cplbndstrc & 1) {
440 cplbndstrc >>= 1;
441 i_end += 12;
443 cplbndstrc >>= 1;
444 for (ch = 0; ch < nfchans; ch++)
445 cplco[ch] = state->cplco[ch][bnd] * coeff[ch];
446 bnd++;
448 while (i < i_end) {
449 sample_t cplcoeff;
450 int bapi;
452 bapi = bap[i];
453 switch (bapi) {
454 case 0:
455 cplcoeff = LEVEL_3DB * scale_factor[exp[i]];
456 for (ch = 0; ch < nfchans; ch++)
457 if ((state->chincpl >> ch) & 1) {
458 if (dithflag[ch])
459 samples[ch][i] = (cplcoeff * cplco[ch] *
460 dither_gen (state));
461 else
462 samples[ch][i] = 0;
464 i++;
465 continue;
467 case -1:
468 if (quantizer->q1_ptr >= 0) {
469 cplcoeff = quantizer->q1[quantizer->q1_ptr--];
470 break;
471 } else {
472 int code;
474 code = bitstream_get (state, 5);
476 quantizer->q1_ptr = 1;
477 quantizer->q1[0] = q_1_2[code];
478 quantizer->q1[1] = q_1_1[code];
479 cplcoeff = q_1_0[code];
480 break;
483 case -2:
484 if (quantizer->q2_ptr >= 0) {
485 cplcoeff = quantizer->q2[quantizer->q2_ptr--];
486 break;
487 } else {
488 int code;
490 code = bitstream_get (state, 7);
492 quantizer->q2_ptr = 1;
493 quantizer->q2[0] = q_2_2[code];
494 quantizer->q2[1] = q_2_1[code];
495 cplcoeff = q_2_0[code];
496 break;
499 case 3:
500 cplcoeff = q_3[bitstream_get (state, 3)];
501 break;
503 case -3:
504 if (quantizer->q4_ptr == 0) {
505 quantizer->q4_ptr = -1;
506 cplcoeff = quantizer->q4;
507 break;
508 } else {
509 int code;
511 code = bitstream_get (state, 7);
513 quantizer->q4_ptr = 0;
514 quantizer->q4 = q_4_1[code];
515 cplcoeff = q_4_0[code];
516 break;
519 case 4:
520 cplcoeff = q_5[bitstream_get (state, 4)];
521 break;
523 default:
524 cplcoeff = bitstream_get_2 (state, bapi) << (16 - bapi);
527 cplcoeff *= scale_factor[exp[i]];
528 for (ch = 0; ch < nfchans; ch++)
529 if ((state->chincpl >> ch) & 1)
530 samples[ch][i] = cplcoeff * cplco[ch];
531 i++;
536 int a52_block (a52_state_t * state)
538 static const uint8_t nfchans_tbl[] = {2, 1, 2, 3, 3, 4, 4, 5, 1, 1, 2};
539 static int rematrix_band[4] = {25, 37, 61, 253};
540 int i, nfchans, chaninfo;
541 uint8_t cplexpstr, chexpstr[5], lfeexpstr, do_bit_alloc, done_cpl;
542 uint8_t blksw[5], dithflag[5];
543 sample_t coeff[5];
544 int chanbias;
545 quantizer_t quantizer;
546 sample_t * samples;
548 nfchans = nfchans_tbl[state->acmod];
550 for (i = 0; i < nfchans; i++)
551 blksw[i] = bitstream_get (state, 1);
553 for (i = 0; i < nfchans; i++)
554 dithflag[i] = bitstream_get (state, 1);
556 chaninfo = !state->acmod;
557 do {
558 if (bitstream_get (state, 1)) { /* dynrnge */
559 int dynrng;
561 dynrng = bitstream_get_2 (state, 8);
562 if (state->dynrnge) {
563 sample_t range;
565 range = ((((dynrng & 0x1f) | 0x20) << 13) *
566 scale_factor[3 - (dynrng >> 5)]);
567 if (state->dynrngcall)
568 range = state->dynrngcall (range, state->dynrngdata);
569 state->dynrng = state->level * range;
572 } while (chaninfo--);
574 if (bitstream_get (state, 1)) { /* cplstre */
575 state->chincpl = 0;
576 if (bitstream_get (state, 1)) { /* cplinu */
577 static uint8_t bndtab[16] = {31, 35, 37, 39, 41, 42, 43, 44,
578 45, 45, 46, 46, 47, 47, 48, 48};
579 int cplbegf;
580 int cplendf;
581 int ncplsubnd;
583 for (i = 0; i < nfchans; i++)
584 state->chincpl |= bitstream_get (state, 1) << i;
585 switch (state->acmod) {
586 case 0: case 1:
587 return 1;
588 case 2:
589 state->phsflginu = bitstream_get (state, 1);
591 cplbegf = bitstream_get (state, 4);
592 cplendf = bitstream_get (state, 4);
594 if (cplendf + 3 - cplbegf < 0)
595 return 1;
596 state->ncplbnd = ncplsubnd = cplendf + 3 - cplbegf;
597 state->cplstrtbnd = bndtab[cplbegf];
598 state->cplstrtmant = cplbegf * 12 + 37;
599 state->cplendmant = cplendf * 12 + 73;
601 state->cplbndstrc = 0;
602 for (i = 0; i < ncplsubnd - 1; i++)
603 if (bitstream_get (state, 1)) {
604 state->cplbndstrc |= 1 << i;
605 state->ncplbnd--;
610 if (state->chincpl) { /* cplinu */
611 int j, cplcoe;
613 cplcoe = 0;
614 for (i = 0; i < nfchans; i++)
615 if ((state->chincpl) >> i & 1)
616 if (bitstream_get (state, 1)) { /* cplcoe */
617 int mstrcplco, cplcoexp, cplcomant;
619 cplcoe = 1;
620 mstrcplco = 3 * bitstream_get (state, 2);
621 for (j = 0; j < state->ncplbnd; j++) {
622 cplcoexp = bitstream_get (state, 4);
623 cplcomant = bitstream_get (state, 4);
624 if (cplcoexp == 15)
625 cplcomant <<= 14;
626 else
627 cplcomant = (cplcomant | 0x10) << 13;
628 state->cplco[i][j] =
629 cplcomant * scale_factor[cplcoexp + mstrcplco];
632 if ((state->acmod == 2) && state->phsflginu && cplcoe)
633 for (j = 0; j < state->ncplbnd; j++)
634 if (bitstream_get (state, 1)) /* phsflg */
635 state->cplco[1][j] = -state->cplco[1][j];
638 if ((state->acmod == 2) && (bitstream_get (state, 1))) { /* rematstr */
639 int end;
641 state->rematflg = 0;
642 end = (state->chincpl) ? state->cplstrtmant : 253; /* cplinu */
643 i = 0;
645 state->rematflg |= bitstream_get (state, 1) << i;
646 while (rematrix_band[i++] < end);
649 cplexpstr = EXP_REUSE;
650 lfeexpstr = EXP_REUSE;
651 if (state->chincpl) /* cplinu */
652 cplexpstr = bitstream_get (state, 2);
653 for (i = 0; i < nfchans; i++)
654 chexpstr[i] = bitstream_get (state, 2);
655 if (state->lfeon)
656 lfeexpstr = bitstream_get (state, 1);
658 for (i = 0; i < nfchans; i++)
659 if (chexpstr[i] != EXP_REUSE) {
660 if ((state->chincpl >> i) & 1)
661 state->endmant[i] = state->cplstrtmant;
662 else {
663 int chbwcod;
665 chbwcod = bitstream_get (state, 6);
666 if (chbwcod > 60)
667 return 1;
668 state->endmant[i] = chbwcod * 3 + 73;
672 do_bit_alloc = 0;
674 if (cplexpstr != EXP_REUSE) {
675 int cplabsexp, ncplgrps;
677 do_bit_alloc = 64;
678 ncplgrps = ((state->cplendmant - state->cplstrtmant) /
679 (3 << (cplexpstr - 1)));
680 cplabsexp = bitstream_get (state, 4) << 1;
681 if (parse_exponents (state, cplexpstr, ncplgrps, cplabsexp,
682 state->cpl_expbap.exp + state->cplstrtmant))
683 return 1;
685 for (i = 0; i < nfchans; i++)
686 if (chexpstr[i] != EXP_REUSE) {
687 int grp_size, nchgrps;
689 do_bit_alloc |= 1 << i;
690 grp_size = 3 << (chexpstr[i] - 1);
691 nchgrps = (state->endmant[i] + grp_size - 4) / grp_size;
692 state->fbw_expbap[i].exp[0] = bitstream_get (state, 4);
693 if (parse_exponents (state, chexpstr[i], nchgrps,
694 state->fbw_expbap[i].exp[0],
695 state->fbw_expbap[i].exp + 1))
696 return 1;
697 bitstream_skip (state, 2); /* gainrng */
699 if (lfeexpstr != EXP_REUSE) {
700 do_bit_alloc |= 32;
701 state->lfe_expbap.exp[0] = bitstream_get (state, 4);
702 if (parse_exponents (state, lfeexpstr, 2, state->lfe_expbap.exp[0],
703 state->lfe_expbap.exp + 1))
704 return 1;
707 if (bitstream_get (state, 1)) { /* baie */
708 do_bit_alloc = -1;
709 state->bai = bitstream_get (state, 11);
711 if (bitstream_get (state, 1)) { /* snroffste */
712 do_bit_alloc = -1;
713 state->csnroffst = bitstream_get (state, 6);
714 if (state->chincpl) /* cplinu */
715 state->cplba.bai = bitstream_get (state, 7);
716 for (i = 0; i < nfchans; i++)
717 state->ba[i].bai = bitstream_get (state, 7);
718 if (state->lfeon)
719 state->lfeba.bai = bitstream_get (state, 7);
721 if ((state->chincpl) && (bitstream_get (state, 1))) { /* cplleake */
722 do_bit_alloc |= 64;
723 state->cplfleak = 9 - bitstream_get (state, 3);
724 state->cplsleak = 9 - bitstream_get (state, 3);
727 if (bitstream_get (state, 1)) { /* deltbaie */
728 do_bit_alloc = -1;
729 if (state->chincpl) /* cplinu */
730 state->cplba.deltbae = bitstream_get (state, 2);
731 for (i = 0; i < nfchans; i++)
732 state->ba[i].deltbae = bitstream_get (state, 2);
733 if (state->chincpl && /* cplinu */
734 (state->cplba.deltbae == DELTA_BIT_NEW) &&
735 parse_deltba (state, state->cplba.deltba))
736 return 1;
737 for (i = 0; i < nfchans; i++)
738 if ((state->ba[i].deltbae == DELTA_BIT_NEW) &&
739 parse_deltba (state, state->ba[i].deltba))
740 return 1;
743 if (do_bit_alloc) {
744 if (zero_snr_offsets (nfchans, state)) {
745 memset (state->cpl_expbap.bap, 0, sizeof (state->cpl_expbap.bap));
746 for (i = 0; i < nfchans; i++)
747 memset (state->fbw_expbap[i].bap, 0,
748 sizeof (state->fbw_expbap[i].bap));
749 memset (state->lfe_expbap.bap, 0, sizeof (state->lfe_expbap.bap));
750 } else {
751 if (state->chincpl && (do_bit_alloc & 64)) /* cplinu */
752 a52_bit_allocate (state, &state->cplba, state->cplstrtbnd,
753 state->cplstrtmant, state->cplendmant,
754 state->cplfleak << 8, state->cplsleak << 8,
755 &state->cpl_expbap);
756 for (i = 0; i < nfchans; i++)
757 if (do_bit_alloc & (1 << i))
758 a52_bit_allocate (state, state->ba + i, 0, 0,
759 state->endmant[i], 0, 0,
760 state->fbw_expbap +i);
761 if (state->lfeon && (do_bit_alloc & 32)) {
762 state->lfeba.deltbae = DELTA_BIT_NONE;
763 a52_bit_allocate (state, &state->lfeba, 0, 0, 7, 0, 0,
764 &state->lfe_expbap);
769 if (bitstream_get (state, 1)) { /* skiple */
770 i = bitstream_get (state, 9); /* skipl */
771 while (i--)
772 bitstream_skip (state, 8);
775 samples = state->samples;
776 if (state->output & A52_LFE)
777 samples += 256; /* shift for LFE channel */
779 chanbias = a52_downmix_coeff (coeff, state->acmod, state->output,
780 state->dynrng, state->clev, state->slev);
782 quantizer.q1_ptr = quantizer.q2_ptr = quantizer.q4_ptr = -1;
783 done_cpl = 0;
785 for (i = 0; i < nfchans; i++) {
786 int j;
788 coeff_get (state, samples + 256 * i, state->fbw_expbap +i, &quantizer,
789 coeff[i], dithflag[i], state->endmant[i]);
791 if ((state->chincpl >> i) & 1) {
792 if (!done_cpl) {
793 done_cpl = 1;
794 coeff_get_coupling (state, nfchans, coeff,
795 (sample_t (*)[256])samples, &quantizer,
796 dithflag);
798 j = state->cplendmant;
799 } else
800 j = state->endmant[i];
802 (samples + 256 * i)[j] = 0;
803 while (++j < 256);
806 if (state->acmod == 2) {
807 int j, end, band, rematflg;
809 end = ((state->endmant[0] < state->endmant[1]) ?
810 state->endmant[0] : state->endmant[1]);
812 i = 0;
813 j = 13;
814 rematflg = state->rematflg;
815 do {
816 if (! (rematflg & 1)) {
817 rematflg >>= 1;
818 j = rematrix_band[i++];
819 continue;
821 rematflg >>= 1;
822 band = rematrix_band[i++];
823 if (band > end)
824 band = end;
825 do {
826 sample_t tmp0, tmp1;
828 tmp0 = samples[j];
829 tmp1 = (samples+256)[j];
830 samples[j] = tmp0 + tmp1;
831 (samples+256)[j] = tmp0 - tmp1;
832 } while (++j < band);
833 } while (j < end);
836 if (state->lfeon) {
837 if (state->output & A52_LFE) {
838 coeff_get (state, samples - 256, &state->lfe_expbap, &quantizer,
839 state->dynrng, 0, 7);
840 for (i = 7; i < 256; i++)
841 (samples-256)[i] = 0;
842 a52_imdct_512 (samples - 256, samples + 1536 - 256, state->bias);
843 } else {
844 /* just skip the LFE coefficients */
845 coeff_get (state, samples + 1280, &state->lfe_expbap, &quantizer,
846 0, 0, 7);
850 i = 0;
851 if (nfchans_tbl[state->output & A52_CHANNEL_MASK] < nfchans)
852 for (i = 1; i < nfchans; i++)
853 if (blksw[i] != blksw[0])
854 break;
856 if (i < nfchans) {
857 if (state->downmixed) {
858 state->downmixed = 0;
859 a52_upmix (samples + 1536, state->acmod, state->output);
862 for (i = 0; i < nfchans; i++) {
863 sample_t bias;
865 bias = 0;
866 if (!(chanbias & (1 << i)))
867 bias = state->bias;
869 if (coeff[i]) {
870 if (blksw[i])
871 a52_imdct_256 (samples + 256 * i, samples + 1536 + 256 * i,
872 bias);
873 else
874 a52_imdct_512 (samples + 256 * i, samples + 1536 + 256 * i,
875 bias);
876 } else {
877 int j;
879 for (j = 0; j < 256; j++)
880 (samples + 256 * i)[j] = bias;
884 a52_downmix (samples, state->acmod, state->output, state->bias,
885 state->clev, state->slev);
886 } else {
887 nfchans = nfchans_tbl[state->output & A52_CHANNEL_MASK];
889 a52_downmix (samples, state->acmod, state->output, 0,
890 state->clev, state->slev);
892 if (!state->downmixed) {
893 state->downmixed = 1;
894 a52_downmix (samples + 1536, state->acmod, state->output, 0,
895 state->clev, state->slev);
898 if (blksw[0])
899 for (i = 0; i < nfchans; i++)
900 a52_imdct_256 (samples + 256 * i, samples + 1536 + 256 * i,
901 state->bias);
902 else
903 for (i = 0; i < nfchans; i++)
904 a52_imdct_512 (samples + 256 * i, samples + 1536 + 256 * i,
905 state->bias);
908 return 0;
911 void a52_free (a52_state_t * state)
913 #if defined(__MINGW32__) && defined(HAVE_SSE)
914 av_free (state->samples);
915 #else
916 free (state->samples);
917 #endif
918 free (state);