3 * Copyright (c) 2001, 2002 Fabrice Bellard.
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 * @file mpegaudiodec.c
29 #include "bitstream.h"
34 * - in low precision mode, use more 16 bit multiplies in synth filter
35 * - test lsf / mpeg25 extensively.
38 /* define USE_HIGHPRECISION to have a bit exact (but slower) mpeg
40 #ifdef CONFIG_MPEGAUDIO_HP
41 # define USE_HIGHPRECISION
44 #include "mpegaudio.h"
45 #include "mpegaudiodecheader.h"
49 /* WARNING: only correct for posititive numbers */
50 #define FIXR(a) ((int)((a) * FRAC_ONE + 0.5))
51 #define FRAC_RND(a) (((a) + (FRAC_ONE/2)) >> FRAC_BITS)
53 #define FIXHR(a) ((int)((a) * (1LL<<32) + 0.5))
59 /* layer 3 "granule" */
60 typedef struct GranuleDef {
65 int scalefac_compress;
70 uint8_t scalefac_scale;
71 uint8_t count1table_select;
72 int region_size[3]; /* number of huffman codes in each region */
74 int short_start, long_end; /* long/short band indexes */
75 uint8_t scale_factors[40];
76 int32_t sb_hybrid[SBLIMIT * 18]; /* 576 samples */
79 #include "mpegaudiodata.h"
80 #include "mpegaudiodectab.h"
82 static void compute_antialias_integer(MPADecodeContext *s, GranuleDef *g);
83 static void compute_antialias_float(MPADecodeContext *s, GranuleDef *g);
85 /* vlc structure for decoding layer 3 huffman tables */
86 static VLC huff_vlc[16];
87 static VLC huff_quad_vlc[2];
88 /* computed from band_size_long */
89 static uint16_t band_index_long[9][23];
90 /* XXX: free when all decoders are closed */
91 #define TABLE_4_3_SIZE (8191 + 16)*4
92 static int8_t table_4_3_exp[TABLE_4_3_SIZE];
93 static uint32_t table_4_3_value[TABLE_4_3_SIZE];
94 static uint32_t exp_table[512];
95 static uint32_t expval_table[512][16];
96 /* intensity stereo coef table */
97 static int32_t is_table[2][16];
98 static int32_t is_table_lsf[2][2][16];
99 static int32_t csa_table[8][4];
100 static float csa_table_float[8][4];
101 static int32_t mdct_win[8][36];
103 /* lower 2 bits: modulo 3, higher bits: shift */
104 static uint16_t scale_factor_modshift[64];
105 /* [i][j]: 2^(-j/3) * FRAC_ONE * 2^(i+2) / (2^(i+2) - 1) */
106 static int32_t scale_factor_mult[15][3];
107 /* mult table for layer 2 group quantization */
109 #define SCALE_GEN(v) \
110 { FIXR(1.0 * (v)), FIXR(0.7937005259 * (v)), FIXR(0.6299605249 * (v)) }
112 static const int32_t scale_factor_mult2[3][3] = {
113 SCALE_GEN(4.0 / 3.0), /* 3 steps */
114 SCALE_GEN(4.0 / 5.0), /* 5 steps */
115 SCALE_GEN(4.0 / 9.0), /* 9 steps */
118 static DECLARE_ALIGNED_16(MPA_INT, window[512]);
121 * Convert region offsets to region sizes and truncate
122 * size to big_values.
124 void ff_region_offset2size(GranuleDef *g){
126 g->region_size[2] = (576 / 2);
128 k = FFMIN(g->region_size[i], g->big_values);
129 g->region_size[i] = k - j;
134 void ff_init_short_region(MPADecodeContext *s, GranuleDef *g){
135 if (g->block_type == 2)
136 g->region_size[0] = (36 / 2);
138 if (s->sample_rate_index <= 2)
139 g->region_size[0] = (36 / 2);
140 else if (s->sample_rate_index != 8)
141 g->region_size[0] = (54 / 2);
143 g->region_size[0] = (108 / 2);
145 g->region_size[1] = (576 / 2);
148 void ff_init_long_region(MPADecodeContext *s, GranuleDef *g, int ra1, int ra2){
151 band_index_long[s->sample_rate_index][ra1 + 1] >> 1;
152 /* should not overflow */
153 l = FFMIN(ra1 + ra2 + 2, 22);
155 band_index_long[s->sample_rate_index][l] >> 1;
158 void ff_compute_band_indexes(MPADecodeContext *s, GranuleDef *g){
159 if (g->block_type == 2) {
160 if (g->switch_point) {
161 /* if switched mode, we handle the 36 first samples as
162 long blocks. For 8000Hz, we handle the 48 first
163 exponents as long blocks (XXX: check this!) */
164 if (s->sample_rate_index <= 2)
166 else if (s->sample_rate_index != 8)
169 g->long_end = 4; /* 8000 Hz */
171 g->short_start = 2 + (s->sample_rate_index != 8);
182 /* layer 1 unscaling */
183 /* n = number of bits of the mantissa minus 1 */
184 static inline int l1_unscale(int n, int mant, int scale_factor)
189 shift = scale_factor_modshift[scale_factor];
192 val = MUL64(mant + (-1 << n) + 1, scale_factor_mult[n-1][mod]);
194 /* NOTE: at this point, 1 <= shift >= 21 + 15 */
195 return (int)((val + (1LL << (shift - 1))) >> shift);
198 static inline int l2_unscale_group(int steps, int mant, int scale_factor)
202 shift = scale_factor_modshift[scale_factor];
206 val = (mant - (steps >> 1)) * scale_factor_mult2[steps >> 2][mod];
207 /* NOTE: at this point, 0 <= shift <= 21 */
209 val = (val + (1 << (shift - 1))) >> shift;
213 /* compute value^(4/3) * 2^(exponent/4). It normalized to FRAC_BITS */
214 static inline int l3_unscale(int value, int exponent)
219 e = table_4_3_exp [4*value + (exponent&3)];
220 m = table_4_3_value[4*value + (exponent&3)];
221 e -= (exponent >> 2);
225 m = (m + (1 << (e-1))) >> e;
230 /* all integer n^(4/3) computation code */
233 #define POW_FRAC_BITS 24
234 #define POW_FRAC_ONE (1 << POW_FRAC_BITS)
235 #define POW_FIX(a) ((int)((a) * POW_FRAC_ONE))
236 #define POW_MULL(a,b) (((int64_t)(a) * (int64_t)(b)) >> POW_FRAC_BITS)
238 static int dev_4_3_coefs[DEV_ORDER];
241 static int pow_mult3[3] = {
243 POW_FIX(1.25992104989487316476),
244 POW_FIX(1.58740105196819947474),
248 static void int_pow_init(void)
253 for(i=0;i<DEV_ORDER;i++) {
254 a = POW_MULL(a, POW_FIX(4.0 / 3.0) - i * POW_FIX(1.0)) / (i + 1);
255 dev_4_3_coefs[i] = a;
259 #if 0 /* unused, remove? */
260 /* return the mantissa and the binary exponent */
261 static int int_pow(int i, int *exp_ptr)
269 while (a < (1 << (POW_FRAC_BITS - 1))) {
273 a -= (1 << POW_FRAC_BITS);
275 for(j = DEV_ORDER - 1; j >= 0; j--)
276 a1 = POW_MULL(a, dev_4_3_coefs[j] + a1);
277 a = (1 << POW_FRAC_BITS) + a1;
278 /* exponent compute (exact) */
282 a = POW_MULL(a, pow_mult3[er]);
283 while (a >= 2 * POW_FRAC_ONE) {
287 /* convert to float */
288 while (a < POW_FRAC_ONE) {
292 /* now POW_FRAC_ONE <= a < 2 * POW_FRAC_ONE */
293 #if POW_FRAC_BITS > FRAC_BITS
294 a = (a + (1 << (POW_FRAC_BITS - FRAC_BITS - 1))) >> (POW_FRAC_BITS - FRAC_BITS);
295 /* correct overflow */
296 if (a >= 2 * (1 << FRAC_BITS)) {
306 static int decode_init(AVCodecContext * avctx)
308 MPADecodeContext *s = avctx->priv_data;
314 #if defined(USE_HIGHPRECISION) && defined(CONFIG_AUDIO_NONSHORT)
315 avctx->sample_fmt= SAMPLE_FMT_S32;
317 avctx->sample_fmt= SAMPLE_FMT_S16;
319 s->error_resilience= avctx->error_resilience;
321 if(avctx->antialias_algo != FF_AA_FLOAT)
322 s->compute_antialias= compute_antialias_integer;
324 s->compute_antialias= compute_antialias_float;
326 if (!init && !avctx->parse_only) {
327 /* scale factors table for layer 1/2 */
330 /* 1.0 (i = 3) is normalized to 2 ^ FRAC_BITS */
333 scale_factor_modshift[i] = mod | (shift << 2);
336 /* scale factor multiply for layer 1 */
340 norm = ((INT64_C(1) << n) * FRAC_ONE) / ((1 << n) - 1);
341 scale_factor_mult[i][0] = MULL(FIXR(1.0 * 2.0), norm);
342 scale_factor_mult[i][1] = MULL(FIXR(0.7937005259 * 2.0), norm);
343 scale_factor_mult[i][2] = MULL(FIXR(0.6299605249 * 2.0), norm);
344 dprintf(avctx, "%d: norm=%x s=%x %x %x\n",
346 scale_factor_mult[i][0],
347 scale_factor_mult[i][1],
348 scale_factor_mult[i][2]);
351 ff_mpa_synth_init(window);
353 /* huffman decode tables */
355 const HuffTable *h = &mpa_huff_tables[i];
358 uint8_t tmp_bits [512];
359 uint16_t tmp_codes[512];
361 memset(tmp_bits , 0, sizeof(tmp_bits ));
362 memset(tmp_codes, 0, sizeof(tmp_codes));
368 for(x=0;x<xsize;x++) {
369 for(y=0;y<xsize;y++){
370 tmp_bits [(x << 5) | y | ((x&&y)<<4)]= h->bits [j ];
371 tmp_codes[(x << 5) | y | ((x&&y)<<4)]= h->codes[j++];
376 init_vlc(&huff_vlc[i], 7, 512,
377 tmp_bits, 1, 1, tmp_codes, 2, 2, 1);
380 init_vlc(&huff_quad_vlc[i], i == 0 ? 7 : 4, 16,
381 mpa_quad_bits[i], 1, 1, mpa_quad_codes[i], 1, 1, 1);
387 band_index_long[i][j] = k;
388 k += band_size_long[i][j];
390 band_index_long[i][22] = k;
393 /* compute n ^ (4/3) and store it in mantissa/exp format */
396 for(i=1;i<TABLE_4_3_SIZE;i++) {
399 f = pow((double)(i/4), 4.0 / 3.0) * pow(2, (i&3)*0.25);
401 m = (uint32_t)(fm*(1LL<<31) + 0.5);
402 e+= FRAC_BITS - 31 + 5 - 100;
404 /* normalized to FRAC_BITS */
405 table_4_3_value[i] = m;
406 // av_log(NULL, AV_LOG_DEBUG, "%d %d %f\n", i, m, pow((double)i, 4.0 / 3.0));
407 table_4_3_exp[i] = -e;
409 for(i=0; i<512*16; i++){
410 int exponent= (i>>4);
411 double f= pow(i&15, 4.0 / 3.0) * pow(2, (exponent-400)*0.25 + FRAC_BITS + 5);
412 expval_table[exponent][i&15]= llrint(f);
414 exp_table[exponent]= llrint(f);
421 f = tan((double)i * M_PI / 12.0);
422 v = FIXR(f / (1.0 + f));
427 is_table[1][6 - i] = v;
431 is_table[0][i] = is_table[1][i] = 0.0;
438 e = -(j + 1) * ((i + 1) >> 1);
439 f = pow(2.0, e / 4.0);
441 is_table_lsf[j][k ^ 1][i] = FIXR(f);
442 is_table_lsf[j][k][i] = FIXR(1.0);
443 dprintf(avctx, "is_table_lsf %d %d: %x %x\n",
444 i, j, is_table_lsf[j][0][i], is_table_lsf[j][1][i]);
451 cs = 1.0 / sqrt(1.0 + ci * ci);
453 csa_table[i][0] = FIXHR(cs/4);
454 csa_table[i][1] = FIXHR(ca/4);
455 csa_table[i][2] = FIXHR(ca/4) + FIXHR(cs/4);
456 csa_table[i][3] = FIXHR(ca/4) - FIXHR(cs/4);
457 csa_table_float[i][0] = cs;
458 csa_table_float[i][1] = ca;
459 csa_table_float[i][2] = ca + cs;
460 csa_table_float[i][3] = ca - cs;
461 // printf("%d %d %d %d\n", FIX(cs), FIX(cs-1), FIX(ca), FIX(cs)-FIX(ca));
462 // av_log(NULL, AV_LOG_DEBUG,"%f %f %f %f\n", cs, ca, ca+cs, ca-cs);
465 /* compute mdct windows */
473 d= sin(M_PI * (i + 0.5) / 36.0);
476 else if(i>=24) d= sin(M_PI * (i - 18 + 0.5) / 12.0);
480 else if(i< 12) d= sin(M_PI * (i - 6 + 0.5) / 12.0);
483 //merge last stage of imdct into the window coefficients
484 d*= 0.5 / cos(M_PI*(2*i + 19)/72);
487 mdct_win[j][i/3] = FIXHR((d / (1<<5)));
489 mdct_win[j][i ] = FIXHR((d / (1<<5)));
490 // av_log(NULL, AV_LOG_DEBUG, "%2d %d %f\n", i,j,d / (1<<5));
494 /* NOTE: we do frequency inversion adter the MDCT by changing
495 the sign of the right window coefs */
498 mdct_win[j + 4][i] = mdct_win[j][i];
499 mdct_win[j + 4][i + 1] = -mdct_win[j][i + 1];
505 av_log(avctx, AV_LOG_DEBUG, "win%d=\n", j);
507 av_log(avctx, AV_LOG_DEBUG, "%f, ", (double)mdct_win[j][i] / FRAC_ONE);
508 av_log(avctx, AV_LOG_DEBUG, "\n");
517 if (avctx->codec_id == CODEC_ID_MP3ADU)
522 /* tab[i][j] = 1.0 / (2.0 * cos(pi*(2*k+1) / 2^(6 - j))) */
526 #define COS0_0 FIXHR(0.50060299823519630134/2)
527 #define COS0_1 FIXHR(0.50547095989754365998/2)
528 #define COS0_2 FIXHR(0.51544730992262454697/2)
529 #define COS0_3 FIXHR(0.53104259108978417447/2)
530 #define COS0_4 FIXHR(0.55310389603444452782/2)
531 #define COS0_5 FIXHR(0.58293496820613387367/2)
532 #define COS0_6 FIXHR(0.62250412303566481615/2)
533 #define COS0_7 FIXHR(0.67480834145500574602/2)
534 #define COS0_8 FIXHR(0.74453627100229844977/2)
535 #define COS0_9 FIXHR(0.83934964541552703873/2)
536 #define COS0_10 FIXHR(0.97256823786196069369/2)
537 #define COS0_11 FIXHR(1.16943993343288495515/4)
538 #define COS0_12 FIXHR(1.48416461631416627724/4)
539 #define COS0_13 FIXHR(2.05778100995341155085/8)
540 #define COS0_14 FIXHR(3.40760841846871878570/8)
541 #define COS0_15 FIXHR(10.19000812354805681150/32)
543 #define COS1_0 FIXHR(0.50241928618815570551/2)
544 #define COS1_1 FIXHR(0.52249861493968888062/2)
545 #define COS1_2 FIXHR(0.56694403481635770368/2)
546 #define COS1_3 FIXHR(0.64682178335999012954/2)
547 #define COS1_4 FIXHR(0.78815462345125022473/2)
548 #define COS1_5 FIXHR(1.06067768599034747134/4)
549 #define COS1_6 FIXHR(1.72244709823833392782/4)
550 #define COS1_7 FIXHR(5.10114861868916385802/16)
552 #define COS2_0 FIXHR(0.50979557910415916894/2)
553 #define COS2_1 FIXHR(0.60134488693504528054/2)
554 #define COS2_2 FIXHR(0.89997622313641570463/2)
555 #define COS2_3 FIXHR(2.56291544774150617881/8)
557 #define COS3_0 FIXHR(0.54119610014619698439/2)
558 #define COS3_1 FIXHR(1.30656296487637652785/4)
560 #define COS4_0 FIXHR(0.70710678118654752439/2)
562 /* butterfly operator */
563 #define BF(a, b, c, s)\
565 tmp0 = tab[a] + tab[b];\
566 tmp1 = tab[a] - tab[b];\
568 tab[b] = MULH(tmp1<<(s), c);\
571 #define BF1(a, b, c, d)\
573 BF(a, b, COS4_0, 1);\
574 BF(c, d,-COS4_0, 1);\
578 #define BF2(a, b, c, d)\
580 BF(a, b, COS4_0, 1);\
581 BF(c, d,-COS4_0, 1);\
588 #define ADD(a, b) tab[a] += tab[b]
590 /* DCT32 without 1/sqrt(2) coef zero scaling. */
591 static void dct32(int32_t *out, int32_t *tab)
596 BF( 0, 31, COS0_0 , 1);
597 BF(15, 16, COS0_15, 5);
599 BF( 0, 15, COS1_0 , 1);
600 BF(16, 31,-COS1_0 , 1);
602 BF( 7, 24, COS0_7 , 1);
603 BF( 8, 23, COS0_8 , 1);
605 BF( 7, 8, COS1_7 , 4);
606 BF(23, 24,-COS1_7 , 4);
608 BF( 0, 7, COS2_0 , 1);
609 BF( 8, 15,-COS2_0 , 1);
610 BF(16, 23, COS2_0 , 1);
611 BF(24, 31,-COS2_0 , 1);
613 BF( 3, 28, COS0_3 , 1);
614 BF(12, 19, COS0_12, 2);
616 BF( 3, 12, COS1_3 , 1);
617 BF(19, 28,-COS1_3 , 1);
619 BF( 4, 27, COS0_4 , 1);
620 BF(11, 20, COS0_11, 2);
622 BF( 4, 11, COS1_4 , 1);
623 BF(20, 27,-COS1_4 , 1);
625 BF( 3, 4, COS2_3 , 3);
626 BF(11, 12,-COS2_3 , 3);
627 BF(19, 20, COS2_3 , 3);
628 BF(27, 28,-COS2_3 , 3);
630 BF( 0, 3, COS3_0 , 1);
631 BF( 4, 7,-COS3_0 , 1);
632 BF( 8, 11, COS3_0 , 1);
633 BF(12, 15,-COS3_0 , 1);
634 BF(16, 19, COS3_0 , 1);
635 BF(20, 23,-COS3_0 , 1);
636 BF(24, 27, COS3_0 , 1);
637 BF(28, 31,-COS3_0 , 1);
642 BF( 1, 30, COS0_1 , 1);
643 BF(14, 17, COS0_14, 3);
645 BF( 1, 14, COS1_1 , 1);
646 BF(17, 30,-COS1_1 , 1);
648 BF( 6, 25, COS0_6 , 1);
649 BF( 9, 22, COS0_9 , 1);
651 BF( 6, 9, COS1_6 , 2);
652 BF(22, 25,-COS1_6 , 2);
654 BF( 1, 6, COS2_1 , 1);
655 BF( 9, 14,-COS2_1 , 1);
656 BF(17, 22, COS2_1 , 1);
657 BF(25, 30,-COS2_1 , 1);
660 BF( 2, 29, COS0_2 , 1);
661 BF(13, 18, COS0_13, 3);
663 BF( 2, 13, COS1_2 , 1);
664 BF(18, 29,-COS1_2 , 1);
666 BF( 5, 26, COS0_5 , 1);
667 BF(10, 21, COS0_10, 1);
669 BF( 5, 10, COS1_5 , 2);
670 BF(21, 26,-COS1_5 , 2);
672 BF( 2, 5, COS2_2 , 1);
673 BF(10, 13,-COS2_2 , 1);
674 BF(18, 21, COS2_2 , 1);
675 BF(26, 29,-COS2_2 , 1);
677 BF( 1, 2, COS3_1 , 2);
678 BF( 5, 6,-COS3_1 , 2);
679 BF( 9, 10, COS3_1 , 2);
680 BF(13, 14,-COS3_1 , 2);
681 BF(17, 18, COS3_1 , 2);
682 BF(21, 22,-COS3_1 , 2);
683 BF(25, 26, COS3_1 , 2);
684 BF(29, 30,-COS3_1 , 2);
731 out[ 1] = tab[16] + tab[24];
732 out[17] = tab[17] + tab[25];
733 out[ 9] = tab[18] + tab[26];
734 out[25] = tab[19] + tab[27];
735 out[ 5] = tab[20] + tab[28];
736 out[21] = tab[21] + tab[29];
737 out[13] = tab[22] + tab[30];
738 out[29] = tab[23] + tab[31];
739 out[ 3] = tab[24] + tab[20];
740 out[19] = tab[25] + tab[21];
741 out[11] = tab[26] + tab[22];
742 out[27] = tab[27] + tab[23];
743 out[ 7] = tab[28] + tab[18];
744 out[23] = tab[29] + tab[19];
745 out[15] = tab[30] + tab[17];
751 static inline int round_sample(int *sum)
754 sum1 = (*sum) >> OUT_SHIFT;
755 *sum &= (1<<OUT_SHIFT)-1;
758 else if (sum1 > OUT_MAX)
763 /* signed 16x16 -> 32 multiply add accumulate */
764 #define MACS(rt, ra, rb) MAC16(rt, ra, rb)
766 /* signed 16x16 -> 32 multiply */
767 #define MULS(ra, rb) MUL16(ra, rb)
769 #define MLSS(rt, ra, rb) MLS16(rt, ra, rb)
773 static inline int round_sample(int64_t *sum)
776 sum1 = (int)((*sum) >> OUT_SHIFT);
777 *sum &= (1<<OUT_SHIFT)-1;
780 else if (sum1 > OUT_MAX)
785 # define MULS(ra, rb) MUL64(ra, rb)
786 # define MACS(rt, ra, rb) MAC64(rt, ra, rb)
787 # define MLSS(rt, ra, rb) MLS64(rt, ra, rb)
790 #define SUM8(op, sum, w, p) \
792 op(sum, (w)[0 * 64], p[0 * 64]); \
793 op(sum, (w)[1 * 64], p[1 * 64]); \
794 op(sum, (w)[2 * 64], p[2 * 64]); \
795 op(sum, (w)[3 * 64], p[3 * 64]); \
796 op(sum, (w)[4 * 64], p[4 * 64]); \
797 op(sum, (w)[5 * 64], p[5 * 64]); \
798 op(sum, (w)[6 * 64], p[6 * 64]); \
799 op(sum, (w)[7 * 64], p[7 * 64]); \
802 #define SUM8P2(sum1, op1, sum2, op2, w1, w2, p) \
806 op1(sum1, (w1)[0 * 64], tmp);\
807 op2(sum2, (w2)[0 * 64], tmp);\
809 op1(sum1, (w1)[1 * 64], tmp);\
810 op2(sum2, (w2)[1 * 64], tmp);\
812 op1(sum1, (w1)[2 * 64], tmp);\
813 op2(sum2, (w2)[2 * 64], tmp);\
815 op1(sum1, (w1)[3 * 64], tmp);\
816 op2(sum2, (w2)[3 * 64], tmp);\
818 op1(sum1, (w1)[4 * 64], tmp);\
819 op2(sum2, (w2)[4 * 64], tmp);\
821 op1(sum1, (w1)[5 * 64], tmp);\
822 op2(sum2, (w2)[5 * 64], tmp);\
824 op1(sum1, (w1)[6 * 64], tmp);\
825 op2(sum2, (w2)[6 * 64], tmp);\
827 op1(sum1, (w1)[7 * 64], tmp);\
828 op2(sum2, (w2)[7 * 64], tmp);\
831 void ff_mpa_synth_init(MPA_INT *window)
835 /* max = 18760, max sum over all 16 coefs : 44736 */
838 v = ff_mpa_enwindow[i];
840 v = (v + (1 << (16 - WFRAC_BITS - 1))) >> (16 - WFRAC_BITS);
850 /* 32 sub band synthesis filter. Input: 32 sub band samples, Output:
852 /* XXX: optimize by avoiding ring buffer usage */
853 void ff_mpa_synth_filter(MPA_INT *synth_buf_ptr, int *synth_buf_offset,
854 MPA_INT *window, int *dither_state,
855 OUT_INT *samples, int incr,
856 int32_t sb_samples[SBLIMIT])
859 register MPA_INT *synth_buf;
860 register const MPA_INT *w, *w2, *p;
869 dct32(tmp, sb_samples);
871 offset = *synth_buf_offset;
872 synth_buf = synth_buf_ptr + offset;
877 /* NOTE: can cause a loss in precision if very high amplitude
879 v = av_clip_int16(v);
883 /* copy to avoid wrap */
884 memcpy(synth_buf + 512, synth_buf, 32 * sizeof(MPA_INT));
886 samples2 = samples + 31 * incr;
892 SUM8(MACS, sum, w, p);
894 SUM8(MLSS, sum, w + 32, p);
895 *samples = round_sample(&sum);
899 /* we calculate two samples at the same time to avoid one memory
900 access per two sample */
903 p = synth_buf + 16 + j;
904 SUM8P2(sum, MACS, sum2, MLSS, w, w2, p);
905 p = synth_buf + 48 - j;
906 SUM8P2(sum, MLSS, sum2, MLSS, w + 32, w2 + 32, p);
908 *samples = round_sample(&sum);
911 *samples2 = round_sample(&sum);
918 SUM8(MLSS, sum, w + 32, p);
919 *samples = round_sample(&sum);
922 offset = (offset - 32) & 511;
923 *synth_buf_offset = offset;
926 #define C3 FIXHR(0.86602540378443864676/2)
928 /* 0.5 / cos(pi*(2*i+1)/36) */
929 static const int icos36[9] = {
930 FIXR(0.50190991877167369479),
931 FIXR(0.51763809020504152469), //0
932 FIXR(0.55168895948124587824),
933 FIXR(0.61038729438072803416),
934 FIXR(0.70710678118654752439), //1
935 FIXR(0.87172339781054900991),
936 FIXR(1.18310079157624925896),
937 FIXR(1.93185165257813657349), //2
938 FIXR(5.73685662283492756461),
941 /* 0.5 / cos(pi*(2*i+1)/36) */
942 static const int icos36h[9] = {
943 FIXHR(0.50190991877167369479/2),
944 FIXHR(0.51763809020504152469/2), //0
945 FIXHR(0.55168895948124587824/2),
946 FIXHR(0.61038729438072803416/2),
947 FIXHR(0.70710678118654752439/2), //1
948 FIXHR(0.87172339781054900991/2),
949 FIXHR(1.18310079157624925896/4),
950 FIXHR(1.93185165257813657349/4), //2
951 // FIXHR(5.73685662283492756461),
954 /* 12 points IMDCT. We compute it "by hand" by factorizing obvious
956 static void imdct12(int *out, int *in)
958 int in0, in1, in2, in3, in4, in5, t1, t2;
961 in1= in[1*3] + in[0*3];
962 in2= in[2*3] + in[1*3];
963 in3= in[3*3] + in[2*3];
964 in4= in[4*3] + in[3*3];
965 in5= in[5*3] + in[4*3];
969 in2= MULH(2*in2, C3);
970 in3= MULH(4*in3, C3);
973 t2 = MULH(2*(in1 - in5), icos36h[4]);
983 in1 = MULH(in5 + in3, icos36h[1]);
990 in5 = MULH(2*(in5 - in3), icos36h[7]);
998 #define C1 FIXHR(0.98480775301220805936/2)
999 #define C2 FIXHR(0.93969262078590838405/2)
1000 #define C3 FIXHR(0.86602540378443864676/2)
1001 #define C4 FIXHR(0.76604444311897803520/2)
1002 #define C5 FIXHR(0.64278760968653932632/2)
1003 #define C6 FIXHR(0.5/2)
1004 #define C7 FIXHR(0.34202014332566873304/2)
1005 #define C8 FIXHR(0.17364817766693034885/2)
1008 /* using Lee like decomposition followed by hand coded 9 points DCT */
1009 static void imdct36(int *out, int *buf, int *in, int *win)
1011 int i, j, t0, t1, t2, t3, s0, s1, s2, s3;
1012 int tmp[18], *tmp1, *in1;
1023 //more accurate but slower
1024 int64_t t0, t1, t2, t3;
1025 t2 = in1[2*4] + in1[2*8] - in1[2*2];
1027 t3 = (in1[2*0] + (int64_t)(in1[2*6]>>1))<<32;
1028 t1 = in1[2*0] - in1[2*6];
1029 tmp1[ 6] = t1 - (t2>>1);
1032 t0 = MUL64(2*(in1[2*2] + in1[2*4]), C2);
1033 t1 = MUL64( in1[2*4] - in1[2*8] , -2*C8);
1034 t2 = MUL64(2*(in1[2*2] + in1[2*8]), -C4);
1036 tmp1[10] = (t3 - t0 - t2) >> 32;
1037 tmp1[ 2] = (t3 + t0 + t1) >> 32;
1038 tmp1[14] = (t3 + t2 - t1) >> 32;
1040 tmp1[ 4] = MULH(2*(in1[2*5] + in1[2*7] - in1[2*1]), -C3);
1041 t2 = MUL64(2*(in1[2*1] + in1[2*5]), C1);
1042 t3 = MUL64( in1[2*5] - in1[2*7] , -2*C7);
1043 t0 = MUL64(2*in1[2*3], C3);
1045 t1 = MUL64(2*(in1[2*1] + in1[2*7]), -C5);
1047 tmp1[ 0] = (t2 + t3 + t0) >> 32;
1048 tmp1[12] = (t2 + t1 - t0) >> 32;
1049 tmp1[ 8] = (t3 - t1 - t0) >> 32;
1051 t2 = in1[2*4] + in1[2*8] - in1[2*2];
1053 t3 = in1[2*0] + (in1[2*6]>>1);
1054 t1 = in1[2*0] - in1[2*6];
1055 tmp1[ 6] = t1 - (t2>>1);
1058 t0 = MULH(2*(in1[2*2] + in1[2*4]), C2);
1059 t1 = MULH( in1[2*4] - in1[2*8] , -2*C8);
1060 t2 = MULH(2*(in1[2*2] + in1[2*8]), -C4);
1062 tmp1[10] = t3 - t0 - t2;
1063 tmp1[ 2] = t3 + t0 + t1;
1064 tmp1[14] = t3 + t2 - t1;
1066 tmp1[ 4] = MULH(2*(in1[2*5] + in1[2*7] - in1[2*1]), -C3);
1067 t2 = MULH(2*(in1[2*1] + in1[2*5]), C1);
1068 t3 = MULH( in1[2*5] - in1[2*7] , -2*C7);
1069 t0 = MULH(2*in1[2*3], C3);
1071 t1 = MULH(2*(in1[2*1] + in1[2*7]), -C5);
1073 tmp1[ 0] = t2 + t3 + t0;
1074 tmp1[12] = t2 + t1 - t0;
1075 tmp1[ 8] = t3 - t1 - t0;
1088 s1 = MULH(2*(t3 + t2), icos36h[j]);
1089 s3 = MULL(t3 - t2, icos36[8 - j]);
1093 out[(9 + j)*SBLIMIT] = MULH(t1, win[9 + j]) + buf[9 + j];
1094 out[(8 - j)*SBLIMIT] = MULH(t1, win[8 - j]) + buf[8 - j];
1095 buf[9 + j] = MULH(t0, win[18 + 9 + j]);
1096 buf[8 - j] = MULH(t0, win[18 + 8 - j]);
1100 out[(9 + 8 - j)*SBLIMIT] = MULH(t1, win[9 + 8 - j]) + buf[9 + 8 - j];
1101 out[( j)*SBLIMIT] = MULH(t1, win[ j]) + buf[ j];
1102 buf[9 + 8 - j] = MULH(t0, win[18 + 9 + 8 - j]);
1103 buf[ + j] = MULH(t0, win[18 + j]);
1108 s1 = MULH(2*tmp[17], icos36h[4]);
1111 out[(9 + 4)*SBLIMIT] = MULH(t1, win[9 + 4]) + buf[9 + 4];
1112 out[(8 - 4)*SBLIMIT] = MULH(t1, win[8 - 4]) + buf[8 - 4];
1113 buf[9 + 4] = MULH(t0, win[18 + 9 + 4]);
1114 buf[8 - 4] = MULH(t0, win[18 + 8 - 4]);
1117 /* return the number of decoded frames */
1118 static int mp_decode_layer1(MPADecodeContext *s)
1120 int bound, i, v, n, ch, j, mant;
1121 uint8_t allocation[MPA_MAX_CHANNELS][SBLIMIT];
1122 uint8_t scale_factors[MPA_MAX_CHANNELS][SBLIMIT];
1124 if (s->mode == MPA_JSTEREO)
1125 bound = (s->mode_ext + 1) * 4;
1129 /* allocation bits */
1130 for(i=0;i<bound;i++) {
1131 for(ch=0;ch<s->nb_channels;ch++) {
1132 allocation[ch][i] = get_bits(&s->gb, 4);
1135 for(i=bound;i<SBLIMIT;i++) {
1136 allocation[0][i] = get_bits(&s->gb, 4);
1140 for(i=0;i<bound;i++) {
1141 for(ch=0;ch<s->nb_channels;ch++) {
1142 if (allocation[ch][i])
1143 scale_factors[ch][i] = get_bits(&s->gb, 6);
1146 for(i=bound;i<SBLIMIT;i++) {
1147 if (allocation[0][i]) {
1148 scale_factors[0][i] = get_bits(&s->gb, 6);
1149 scale_factors[1][i] = get_bits(&s->gb, 6);
1153 /* compute samples */
1155 for(i=0;i<bound;i++) {
1156 for(ch=0;ch<s->nb_channels;ch++) {
1157 n = allocation[ch][i];
1159 mant = get_bits(&s->gb, n + 1);
1160 v = l1_unscale(n, mant, scale_factors[ch][i]);
1164 s->sb_samples[ch][j][i] = v;
1167 for(i=bound;i<SBLIMIT;i++) {
1168 n = allocation[0][i];
1170 mant = get_bits(&s->gb, n + 1);
1171 v = l1_unscale(n, mant, scale_factors[0][i]);
1172 s->sb_samples[0][j][i] = v;
1173 v = l1_unscale(n, mant, scale_factors[1][i]);
1174 s->sb_samples[1][j][i] = v;
1176 s->sb_samples[0][j][i] = 0;
1177 s->sb_samples[1][j][i] = 0;
1184 static int mp_decode_layer2(MPADecodeContext *s)
1186 int sblimit; /* number of used subbands */
1187 const unsigned char *alloc_table;
1188 int table, bit_alloc_bits, i, j, ch, bound, v;
1189 unsigned char bit_alloc[MPA_MAX_CHANNELS][SBLIMIT];
1190 unsigned char scale_code[MPA_MAX_CHANNELS][SBLIMIT];
1191 unsigned char scale_factors[MPA_MAX_CHANNELS][SBLIMIT][3], *sf;
1192 int scale, qindex, bits, steps, k, l, m, b;
1194 /* select decoding table */
1195 table = ff_mpa_l2_select_table(s->bit_rate / 1000, s->nb_channels,
1196 s->sample_rate, s->lsf);
1197 sblimit = ff_mpa_sblimit_table[table];
1198 alloc_table = ff_mpa_alloc_tables[table];
1200 if (s->mode == MPA_JSTEREO)
1201 bound = (s->mode_ext + 1) * 4;
1205 dprintf(s->avctx, "bound=%d sblimit=%d\n", bound, sblimit);
1208 if( bound > sblimit ) bound = sblimit;
1210 /* parse bit allocation */
1212 for(i=0;i<bound;i++) {
1213 bit_alloc_bits = alloc_table[j];
1214 for(ch=0;ch<s->nb_channels;ch++) {
1215 bit_alloc[ch][i] = get_bits(&s->gb, bit_alloc_bits);
1217 j += 1 << bit_alloc_bits;
1219 for(i=bound;i<sblimit;i++) {
1220 bit_alloc_bits = alloc_table[j];
1221 v = get_bits(&s->gb, bit_alloc_bits);
1222 bit_alloc[0][i] = v;
1223 bit_alloc[1][i] = v;
1224 j += 1 << bit_alloc_bits;
1229 for(ch=0;ch<s->nb_channels;ch++) {
1230 for(i=0;i<sblimit;i++)
1231 dprintf(s->avctx, " %d", bit_alloc[ch][i]);
1232 dprintf(s->avctx, "\n");
1238 for(i=0;i<sblimit;i++) {
1239 for(ch=0;ch<s->nb_channels;ch++) {
1240 if (bit_alloc[ch][i])
1241 scale_code[ch][i] = get_bits(&s->gb, 2);
1246 for(i=0;i<sblimit;i++) {
1247 for(ch=0;ch<s->nb_channels;ch++) {
1248 if (bit_alloc[ch][i]) {
1249 sf = scale_factors[ch][i];
1250 switch(scale_code[ch][i]) {
1253 sf[0] = get_bits(&s->gb, 6);
1254 sf[1] = get_bits(&s->gb, 6);
1255 sf[2] = get_bits(&s->gb, 6);
1258 sf[0] = get_bits(&s->gb, 6);
1263 sf[0] = get_bits(&s->gb, 6);
1264 sf[2] = get_bits(&s->gb, 6);
1268 sf[0] = get_bits(&s->gb, 6);
1269 sf[2] = get_bits(&s->gb, 6);
1278 for(ch=0;ch<s->nb_channels;ch++) {
1279 for(i=0;i<sblimit;i++) {
1280 if (bit_alloc[ch][i]) {
1281 sf = scale_factors[ch][i];
1282 dprintf(s->avctx, " %d %d %d", sf[0], sf[1], sf[2]);
1284 dprintf(s->avctx, " -");
1287 dprintf(s->avctx, "\n");
1293 for(l=0;l<12;l+=3) {
1295 for(i=0;i<bound;i++) {
1296 bit_alloc_bits = alloc_table[j];
1297 for(ch=0;ch<s->nb_channels;ch++) {
1298 b = bit_alloc[ch][i];
1300 scale = scale_factors[ch][i][k];
1301 qindex = alloc_table[j+b];
1302 bits = ff_mpa_quant_bits[qindex];
1304 /* 3 values at the same time */
1305 v = get_bits(&s->gb, -bits);
1306 steps = ff_mpa_quant_steps[qindex];
1307 s->sb_samples[ch][k * 12 + l + 0][i] =
1308 l2_unscale_group(steps, v % steps, scale);
1310 s->sb_samples[ch][k * 12 + l + 1][i] =
1311 l2_unscale_group(steps, v % steps, scale);
1313 s->sb_samples[ch][k * 12 + l + 2][i] =
1314 l2_unscale_group(steps, v, scale);
1317 v = get_bits(&s->gb, bits);
1318 v = l1_unscale(bits - 1, v, scale);
1319 s->sb_samples[ch][k * 12 + l + m][i] = v;
1323 s->sb_samples[ch][k * 12 + l + 0][i] = 0;
1324 s->sb_samples[ch][k * 12 + l + 1][i] = 0;
1325 s->sb_samples[ch][k * 12 + l + 2][i] = 0;
1328 /* next subband in alloc table */
1329 j += 1 << bit_alloc_bits;
1331 /* XXX: find a way to avoid this duplication of code */
1332 for(i=bound;i<sblimit;i++) {
1333 bit_alloc_bits = alloc_table[j];
1334 b = bit_alloc[0][i];
1336 int mant, scale0, scale1;
1337 scale0 = scale_factors[0][i][k];
1338 scale1 = scale_factors[1][i][k];
1339 qindex = alloc_table[j+b];
1340 bits = ff_mpa_quant_bits[qindex];
1342 /* 3 values at the same time */
1343 v = get_bits(&s->gb, -bits);
1344 steps = ff_mpa_quant_steps[qindex];
1347 s->sb_samples[0][k * 12 + l + 0][i] =
1348 l2_unscale_group(steps, mant, scale0);
1349 s->sb_samples[1][k * 12 + l + 0][i] =
1350 l2_unscale_group(steps, mant, scale1);
1353 s->sb_samples[0][k * 12 + l + 1][i] =
1354 l2_unscale_group(steps, mant, scale0);
1355 s->sb_samples[1][k * 12 + l + 1][i] =
1356 l2_unscale_group(steps, mant, scale1);
1357 s->sb_samples[0][k * 12 + l + 2][i] =
1358 l2_unscale_group(steps, v, scale0);
1359 s->sb_samples[1][k * 12 + l + 2][i] =
1360 l2_unscale_group(steps, v, scale1);
1363 mant = get_bits(&s->gb, bits);
1364 s->sb_samples[0][k * 12 + l + m][i] =
1365 l1_unscale(bits - 1, mant, scale0);
1366 s->sb_samples[1][k * 12 + l + m][i] =
1367 l1_unscale(bits - 1, mant, scale1);
1371 s->sb_samples[0][k * 12 + l + 0][i] = 0;
1372 s->sb_samples[0][k * 12 + l + 1][i] = 0;
1373 s->sb_samples[0][k * 12 + l + 2][i] = 0;
1374 s->sb_samples[1][k * 12 + l + 0][i] = 0;
1375 s->sb_samples[1][k * 12 + l + 1][i] = 0;
1376 s->sb_samples[1][k * 12 + l + 2][i] = 0;
1378 /* next subband in alloc table */
1379 j += 1 << bit_alloc_bits;
1381 /* fill remaining samples to zero */
1382 for(i=sblimit;i<SBLIMIT;i++) {
1383 for(ch=0;ch<s->nb_channels;ch++) {
1384 s->sb_samples[ch][k * 12 + l + 0][i] = 0;
1385 s->sb_samples[ch][k * 12 + l + 1][i] = 0;
1386 s->sb_samples[ch][k * 12 + l + 2][i] = 0;
1394 static inline void lsf_sf_expand(int *slen,
1395 int sf, int n1, int n2, int n3)
1414 static void exponents_from_scale_factors(MPADecodeContext *s,
1418 const uint8_t *bstab, *pretab;
1419 int len, i, j, k, l, v0, shift, gain, gains[3];
1422 exp_ptr = exponents;
1423 gain = g->global_gain - 210;
1424 shift = g->scalefac_scale + 1;
1426 bstab = band_size_long[s->sample_rate_index];
1427 pretab = mpa_pretab[g->preflag];
1428 for(i=0;i<g->long_end;i++) {
1429 v0 = gain - ((g->scale_factors[i] + pretab[i]) << shift) + 400;
1435 if (g->short_start < 13) {
1436 bstab = band_size_short[s->sample_rate_index];
1437 gains[0] = gain - (g->subblock_gain[0] << 3);
1438 gains[1] = gain - (g->subblock_gain[1] << 3);
1439 gains[2] = gain - (g->subblock_gain[2] << 3);
1441 for(i=g->short_start;i<13;i++) {
1444 v0 = gains[l] - (g->scale_factors[k++] << shift) + 400;
1452 /* handle n = 0 too */
1453 static inline int get_bitsz(GetBitContext *s, int n)
1458 return get_bits(s, n);
1462 static void switch_buffer(MPADecodeContext *s, int *pos, int *end_pos, int *end_pos2){
1463 if(s->in_gb.buffer && *pos >= s->gb.size_in_bits){
1465 s->in_gb.buffer=NULL;
1466 assert((get_bits_count(&s->gb) & 7) == 0);
1467 skip_bits_long(&s->gb, *pos - *end_pos);
1469 *end_pos= *end_pos2 + get_bits_count(&s->gb) - *pos;
1470 *pos= get_bits_count(&s->gb);
1474 static int huffman_decode(MPADecodeContext *s, GranuleDef *g,
1475 int16_t *exponents, int end_pos2)
1479 int last_pos, bits_left;
1481 int end_pos= FFMIN(end_pos2, s->gb.size_in_bits);
1483 /* low frequencies (called big values) */
1486 int j, k, l, linbits;
1487 j = g->region_size[i];
1490 /* select vlc table */
1491 k = g->table_select[i];
1492 l = mpa_huff_data[k][0];
1493 linbits = mpa_huff_data[k][1];
1497 memset(&g->sb_hybrid[s_index], 0, sizeof(*g->sb_hybrid)*2*j);
1502 /* read huffcode and compute each couple */
1504 int exponent, x, y, v;
1505 int pos= get_bits_count(&s->gb);
1507 if (pos >= end_pos){
1508 // av_log(NULL, AV_LOG_ERROR, "pos: %d %d %d %d\n", pos, end_pos, end_pos2, s_index);
1509 switch_buffer(s, &pos, &end_pos, &end_pos2);
1510 // av_log(NULL, AV_LOG_ERROR, "new pos: %d %d\n", pos, end_pos);
1514 y = get_vlc2(&s->gb, vlc->table, 7, 3);
1517 g->sb_hybrid[s_index ] =
1518 g->sb_hybrid[s_index+1] = 0;
1523 exponent= exponents[s_index];
1525 dprintf(s->avctx, "region=%d n=%d x=%d y=%d exp=%d\n",
1526 i, g->region_size[i] - j, x, y, exponent);
1531 v = expval_table[ exponent ][ x ];
1532 // v = expval_table[ (exponent&3) ][ x ] >> FFMIN(0 - (exponent>>2), 31);
1534 x += get_bitsz(&s->gb, linbits);
1535 v = l3_unscale(x, exponent);
1537 if (get_bits1(&s->gb))
1539 g->sb_hybrid[s_index] = v;
1541 v = expval_table[ exponent ][ y ];
1543 y += get_bitsz(&s->gb, linbits);
1544 v = l3_unscale(y, exponent);
1546 if (get_bits1(&s->gb))
1548 g->sb_hybrid[s_index+1] = v;
1554 v = expval_table[ exponent ][ x ];
1556 x += get_bitsz(&s->gb, linbits);
1557 v = l3_unscale(x, exponent);
1559 if (get_bits1(&s->gb))
1561 g->sb_hybrid[s_index+!!y] = v;
1562 g->sb_hybrid[s_index+ !y] = 0;
1568 /* high frequencies */
1569 vlc = &huff_quad_vlc[g->count1table_select];
1571 while (s_index <= 572) {
1573 pos = get_bits_count(&s->gb);
1574 if (pos >= end_pos) {
1575 if (pos > end_pos2 && last_pos){
1576 /* some encoders generate an incorrect size for this
1577 part. We must go back into the data */
1579 skip_bits_long(&s->gb, last_pos - pos);
1580 av_log(NULL, AV_LOG_INFO, "overread, skip %d enddists: %d %d\n", last_pos - pos, end_pos-pos, end_pos2-pos);
1581 if(s->error_resilience >= FF_ER_COMPLIANT)
1585 // av_log(NULL, AV_LOG_ERROR, "pos2: %d %d %d %d\n", pos, end_pos, end_pos2, s_index);
1586 switch_buffer(s, &pos, &end_pos, &end_pos2);
1587 // av_log(NULL, AV_LOG_ERROR, "new pos2: %d %d %d\n", pos, end_pos, s_index);
1593 code = get_vlc2(&s->gb, vlc->table, vlc->bits, 1);
1594 dprintf(s->avctx, "t=%d code=%d\n", g->count1table_select, code);
1595 g->sb_hybrid[s_index+0]=
1596 g->sb_hybrid[s_index+1]=
1597 g->sb_hybrid[s_index+2]=
1598 g->sb_hybrid[s_index+3]= 0;
1600 static const int idxtab[16]={3,3,2,2,1,1,1,1,0,0,0,0,0,0,0,0};
1602 int pos= s_index+idxtab[code];
1603 code ^= 8>>idxtab[code];
1604 v = exp_table[ exponents[pos] ];
1605 // v = exp_table[ (exponents[pos]&3) ] >> FFMIN(0 - (exponents[pos]>>2), 31);
1606 if(get_bits1(&s->gb))
1608 g->sb_hybrid[pos] = v;
1612 /* skip extension bits */
1613 bits_left = end_pos2 - get_bits_count(&s->gb);
1614 //av_log(NULL, AV_LOG_ERROR, "left:%d buf:%p\n", bits_left, s->in_gb.buffer);
1615 if (bits_left < 0/* || bits_left > 500*/) {
1616 av_log(NULL, AV_LOG_ERROR, "bits_left=%d\n", bits_left);
1618 }else if(bits_left > 0 && s->error_resilience >= FF_ER_AGGRESSIVE){
1619 av_log(NULL, AV_LOG_ERROR, "bits_left=%d\n", bits_left);
1622 memset(&g->sb_hybrid[s_index], 0, sizeof(*g->sb_hybrid)*(576 - s_index));
1623 skip_bits_long(&s->gb, bits_left);
1625 i= get_bits_count(&s->gb);
1626 switch_buffer(s, &i, &end_pos, &end_pos2);
1631 /* Reorder short blocks from bitstream order to interleaved order. It
1632 would be faster to do it in parsing, but the code would be far more
1634 static void reorder_block(MPADecodeContext *s, GranuleDef *g)
1637 int32_t *ptr, *dst, *ptr1;
1640 if (g->block_type != 2)
1643 if (g->switch_point) {
1644 if (s->sample_rate_index != 8) {
1645 ptr = g->sb_hybrid + 36;
1647 ptr = g->sb_hybrid + 48;
1653 for(i=g->short_start;i<13;i++) {
1654 len = band_size_short[s->sample_rate_index][i];
1657 for(j=len;j>0;j--) {
1658 *dst++ = ptr[0*len];
1659 *dst++ = ptr[1*len];
1660 *dst++ = ptr[2*len];
1664 memcpy(ptr1, tmp, len * 3 * sizeof(*ptr1));
1668 #define ISQRT2 FIXR(0.70710678118654752440)
1670 static void compute_stereo(MPADecodeContext *s,
1671 GranuleDef *g0, GranuleDef *g1)
1675 int sf_max, tmp0, tmp1, sf, len, non_zero_found;
1676 int32_t (*is_tab)[16];
1677 int32_t *tab0, *tab1;
1678 int non_zero_found_short[3];
1680 /* intensity stereo */
1681 if (s->mode_ext & MODE_EXT_I_STEREO) {
1686 is_tab = is_table_lsf[g1->scalefac_compress & 1];
1690 tab0 = g0->sb_hybrid + 576;
1691 tab1 = g1->sb_hybrid + 576;
1693 non_zero_found_short[0] = 0;
1694 non_zero_found_short[1] = 0;
1695 non_zero_found_short[2] = 0;
1696 k = (13 - g1->short_start) * 3 + g1->long_end - 3;
1697 for(i = 12;i >= g1->short_start;i--) {
1698 /* for last band, use previous scale factor */
1701 len = band_size_short[s->sample_rate_index][i];
1705 if (!non_zero_found_short[l]) {
1706 /* test if non zero band. if so, stop doing i-stereo */
1707 for(j=0;j<len;j++) {
1709 non_zero_found_short[l] = 1;
1713 sf = g1->scale_factors[k + l];
1719 for(j=0;j<len;j++) {
1721 tab0[j] = MULL(tmp0, v1);
1722 tab1[j] = MULL(tmp0, v2);
1726 if (s->mode_ext & MODE_EXT_MS_STEREO) {
1727 /* lower part of the spectrum : do ms stereo
1729 for(j=0;j<len;j++) {
1732 tab0[j] = MULL(tmp0 + tmp1, ISQRT2);
1733 tab1[j] = MULL(tmp0 - tmp1, ISQRT2);
1740 non_zero_found = non_zero_found_short[0] |
1741 non_zero_found_short[1] |
1742 non_zero_found_short[2];
1744 for(i = g1->long_end - 1;i >= 0;i--) {
1745 len = band_size_long[s->sample_rate_index][i];
1748 /* test if non zero band. if so, stop doing i-stereo */
1749 if (!non_zero_found) {
1750 for(j=0;j<len;j++) {
1756 /* for last band, use previous scale factor */
1757 k = (i == 21) ? 20 : i;
1758 sf = g1->scale_factors[k];
1763 for(j=0;j<len;j++) {
1765 tab0[j] = MULL(tmp0, v1);
1766 tab1[j] = MULL(tmp0, v2);
1770 if (s->mode_ext & MODE_EXT_MS_STEREO) {
1771 /* lower part of the spectrum : do ms stereo
1773 for(j=0;j<len;j++) {
1776 tab0[j] = MULL(tmp0 + tmp1, ISQRT2);
1777 tab1[j] = MULL(tmp0 - tmp1, ISQRT2);
1782 } else if (s->mode_ext & MODE_EXT_MS_STEREO) {
1783 /* ms stereo ONLY */
1784 /* NOTE: the 1/sqrt(2) normalization factor is included in the
1786 tab0 = g0->sb_hybrid;
1787 tab1 = g1->sb_hybrid;
1788 for(i=0;i<576;i++) {
1791 tab0[i] = tmp0 + tmp1;
1792 tab1[i] = tmp0 - tmp1;
1797 static void compute_antialias_integer(MPADecodeContext *s,
1803 /* we antialias only "long" bands */
1804 if (g->block_type == 2) {
1805 if (!g->switch_point)
1807 /* XXX: check this for 8000Hz case */
1813 ptr = g->sb_hybrid + 18;
1814 for(i = n;i > 0;i--) {
1815 int tmp0, tmp1, tmp2;
1816 csa = &csa_table[0][0];
1820 tmp2= MULH(tmp0 + tmp1, csa[0+4*j]);\
1821 ptr[-1-j] = 4*(tmp2 - MULH(tmp1, csa[2+4*j]));\
1822 ptr[ j] = 4*(tmp2 + MULH(tmp0, csa[3+4*j]));
1837 static void compute_antialias_float(MPADecodeContext *s,
1843 /* we antialias only "long" bands */
1844 if (g->block_type == 2) {
1845 if (!g->switch_point)
1847 /* XXX: check this for 8000Hz case */
1853 ptr = g->sb_hybrid + 18;
1854 for(i = n;i > 0;i--) {
1856 float *csa = &csa_table_float[0][0];
1857 #define FLOAT_AA(j)\
1860 ptr[-1-j] = lrintf(tmp0 * csa[0+4*j] - tmp1 * csa[1+4*j]);\
1861 ptr[ j] = lrintf(tmp0 * csa[1+4*j] + tmp1 * csa[0+4*j]);
1876 static void compute_imdct(MPADecodeContext *s,
1878 int32_t *sb_samples,
1881 int32_t *ptr, *win, *win1, *buf, *out_ptr, *ptr1;
1883 int i, j, mdct_long_end, v, sblimit;
1885 /* find last non zero block */
1886 ptr = g->sb_hybrid + 576;
1887 ptr1 = g->sb_hybrid + 2 * 18;
1888 while (ptr >= ptr1) {
1890 v = ptr[0] | ptr[1] | ptr[2] | ptr[3] | ptr[4] | ptr[5];
1894 sblimit = ((ptr - g->sb_hybrid) / 18) + 1;
1896 if (g->block_type == 2) {
1897 /* XXX: check for 8000 Hz */
1898 if (g->switch_point)
1903 mdct_long_end = sblimit;
1908 for(j=0;j<mdct_long_end;j++) {
1909 /* apply window & overlap with previous buffer */
1910 out_ptr = sb_samples + j;
1912 if (g->switch_point && j < 2)
1915 win1 = mdct_win[g->block_type];
1916 /* select frequency inversion */
1917 win = win1 + ((4 * 36) & -(j & 1));
1918 imdct36(out_ptr, buf, ptr, win);
1919 out_ptr += 18*SBLIMIT;
1923 for(j=mdct_long_end;j<sblimit;j++) {
1924 /* select frequency inversion */
1925 win = mdct_win[2] + ((4 * 36) & -(j & 1));
1926 out_ptr = sb_samples + j;
1932 imdct12(out2, ptr + 0);
1934 *out_ptr = MULH(out2[i], win[i]) + buf[i + 6*1];
1935 buf[i + 6*2] = MULH(out2[i + 6], win[i + 6]);
1938 imdct12(out2, ptr + 1);
1940 *out_ptr = MULH(out2[i], win[i]) + buf[i + 6*2];
1941 buf[i + 6*0] = MULH(out2[i + 6], win[i + 6]);
1944 imdct12(out2, ptr + 2);
1946 buf[i + 6*0] = MULH(out2[i], win[i]) + buf[i + 6*0];
1947 buf[i + 6*1] = MULH(out2[i + 6], win[i + 6]);
1954 for(j=sblimit;j<SBLIMIT;j++) {
1956 out_ptr = sb_samples + j;
1967 void sample_dump(int fnum, int32_t *tab, int n)
1969 static FILE *files[16], *f;
1976 snprintf(buf, sizeof(buf), "/tmp/out%d.%s.pcm",
1978 #ifdef USE_HIGHPRECISION
1984 f = fopen(buf, "w");
1992 av_log(NULL, AV_LOG_DEBUG, "pos=%d\n", pos);
1994 av_log(NULL, AV_LOG_DEBUG, " %0.4f", (double)tab[i] / FRAC_ONE);
1996 av_log(NULL, AV_LOG_DEBUG, "\n");
2001 /* normalize to 23 frac bits */
2002 v = tab[i] << (23 - FRAC_BITS);
2003 fwrite(&v, 1, sizeof(int32_t), f);
2009 /* main layer3 decoding function */
2010 static int mp_decode_layer3(MPADecodeContext *s)
2012 int nb_granules, main_data_begin, private_bits;
2013 int gr, ch, blocksplit_flag, i, j, k, n, bits_pos;
2014 GranuleDef granules[2][2], *g;
2015 int16_t exponents[576];
2017 /* read side info */
2019 main_data_begin = get_bits(&s->gb, 8);
2020 private_bits = get_bits(&s->gb, s->nb_channels);
2023 main_data_begin = get_bits(&s->gb, 9);
2024 if (s->nb_channels == 2)
2025 private_bits = get_bits(&s->gb, 3);
2027 private_bits = get_bits(&s->gb, 5);
2029 for(ch=0;ch<s->nb_channels;ch++) {
2030 granules[ch][0].scfsi = 0; /* all scale factors are transmitted */
2031 granules[ch][1].scfsi = get_bits(&s->gb, 4);
2035 for(gr=0;gr<nb_granules;gr++) {
2036 for(ch=0;ch<s->nb_channels;ch++) {
2037 dprintf(s->avctx, "gr=%d ch=%d: side_info\n", gr, ch);
2038 g = &granules[ch][gr];
2039 g->part2_3_length = get_bits(&s->gb, 12);
2040 g->big_values = get_bits(&s->gb, 9);
2041 if(g->big_values > 288){
2042 av_log(s->avctx, AV_LOG_ERROR, "big_values too big\n");
2046 g->global_gain = get_bits(&s->gb, 8);
2047 /* if MS stereo only is selected, we precompute the
2048 1/sqrt(2) renormalization factor */
2049 if ((s->mode_ext & (MODE_EXT_MS_STEREO | MODE_EXT_I_STEREO)) ==
2051 g->global_gain -= 2;
2053 g->scalefac_compress = get_bits(&s->gb, 9);
2055 g->scalefac_compress = get_bits(&s->gb, 4);
2056 blocksplit_flag = get_bits1(&s->gb);
2057 if (blocksplit_flag) {
2058 g->block_type = get_bits(&s->gb, 2);
2059 if (g->block_type == 0){
2060 av_log(NULL, AV_LOG_ERROR, "invalid block type\n");
2063 g->switch_point = get_bits1(&s->gb);
2065 g->table_select[i] = get_bits(&s->gb, 5);
2067 g->subblock_gain[i] = get_bits(&s->gb, 3);
2068 ff_init_short_region(s, g);
2070 int region_address1, region_address2;
2072 g->switch_point = 0;
2074 g->table_select[i] = get_bits(&s->gb, 5);
2075 /* compute huffman coded region sizes */
2076 region_address1 = get_bits(&s->gb, 4);
2077 region_address2 = get_bits(&s->gb, 3);
2078 dprintf(s->avctx, "region1=%d region2=%d\n",
2079 region_address1, region_address2);
2080 ff_init_long_region(s, g, region_address1, region_address2);
2082 ff_region_offset2size(g);
2083 ff_compute_band_indexes(s, g);
2087 g->preflag = get_bits1(&s->gb);
2088 g->scalefac_scale = get_bits1(&s->gb);
2089 g->count1table_select = get_bits1(&s->gb);
2090 dprintf(s->avctx, "block_type=%d switch_point=%d\n",
2091 g->block_type, g->switch_point);
2096 const uint8_t *ptr = s->gb.buffer + (get_bits_count(&s->gb)>>3);
2097 assert((get_bits_count(&s->gb) & 7) == 0);
2098 /* now we get bits from the main_data_begin offset */
2099 dprintf(s->avctx, "seekback: %d\n", main_data_begin);
2100 //av_log(NULL, AV_LOG_ERROR, "backstep:%d, lastbuf:%d\n", main_data_begin, s->last_buf_size);
2102 memcpy(s->last_buf + s->last_buf_size, ptr, EXTRABYTES);
2104 init_get_bits(&s->gb, s->last_buf, s->last_buf_size*8);
2105 skip_bits_long(&s->gb, 8*(s->last_buf_size - main_data_begin));
2108 for(gr=0;gr<nb_granules;gr++) {
2109 for(ch=0;ch<s->nb_channels;ch++) {
2110 g = &granules[ch][gr];
2111 if(get_bits_count(&s->gb)<0){
2112 av_log(NULL, AV_LOG_ERROR, "mdb:%d, lastbuf:%d skipping granule %d\n",
2113 main_data_begin, s->last_buf_size, gr);
2114 skip_bits_long(&s->gb, g->part2_3_length);
2115 memset(g->sb_hybrid, 0, sizeof(g->sb_hybrid));
2116 if(get_bits_count(&s->gb) >= s->gb.size_in_bits && s->in_gb.buffer){
2117 skip_bits_long(&s->in_gb, get_bits_count(&s->gb) - s->gb.size_in_bits);
2119 s->in_gb.buffer=NULL;
2124 bits_pos = get_bits_count(&s->gb);
2128 int slen, slen1, slen2;
2130 /* MPEG1 scale factors */
2131 slen1 = slen_table[0][g->scalefac_compress];
2132 slen2 = slen_table[1][g->scalefac_compress];
2133 dprintf(s->avctx, "slen1=%d slen2=%d\n", slen1, slen2);
2134 if (g->block_type == 2) {
2135 n = g->switch_point ? 17 : 18;
2139 g->scale_factors[j++] = get_bits(&s->gb, slen1);
2142 g->scale_factors[j++] = 0;
2146 g->scale_factors[j++] = get_bits(&s->gb, slen2);
2148 g->scale_factors[j++] = 0;
2151 g->scale_factors[j++] = 0;
2154 sc = granules[ch][0].scale_factors;
2157 n = (k == 0 ? 6 : 5);
2158 if ((g->scfsi & (0x8 >> k)) == 0) {
2159 slen = (k < 2) ? slen1 : slen2;
2162 g->scale_factors[j++] = get_bits(&s->gb, slen);
2165 g->scale_factors[j++] = 0;
2168 /* simply copy from last granule */
2170 g->scale_factors[j] = sc[j];
2175 g->scale_factors[j++] = 0;
2179 dprintf(s->avctx, "scfsi=%x gr=%d ch=%d scale_factors:\n",
2182 dprintf(s->avctx, " %d", g->scale_factors[i]);
2183 dprintf(s->avctx, "\n");
2187 int tindex, tindex2, slen[4], sl, sf;
2189 /* LSF scale factors */
2190 if (g->block_type == 2) {
2191 tindex = g->switch_point ? 2 : 1;
2195 sf = g->scalefac_compress;
2196 if ((s->mode_ext & MODE_EXT_I_STEREO) && ch == 1) {
2197 /* intensity stereo case */
2200 lsf_sf_expand(slen, sf, 6, 6, 0);
2202 } else if (sf < 244) {
2203 lsf_sf_expand(slen, sf - 180, 4, 4, 0);
2206 lsf_sf_expand(slen, sf - 244, 3, 0, 0);
2212 lsf_sf_expand(slen, sf, 5, 4, 4);
2214 } else if (sf < 500) {
2215 lsf_sf_expand(slen, sf - 400, 5, 4, 0);
2218 lsf_sf_expand(slen, sf - 500, 3, 0, 0);
2226 n = lsf_nsf_table[tindex2][tindex][k];
2230 g->scale_factors[j++] = get_bits(&s->gb, sl);
2233 g->scale_factors[j++] = 0;
2236 /* XXX: should compute exact size */
2238 g->scale_factors[j] = 0;
2241 dprintf(s->avctx, "gr=%d ch=%d scale_factors:\n",
2244 dprintf(s->avctx, " %d", g->scale_factors[i]);
2245 dprintf(s->avctx, "\n");
2250 exponents_from_scale_factors(s, g, exponents);
2252 /* read Huffman coded residue */
2253 huffman_decode(s, g, exponents, bits_pos + g->part2_3_length);
2255 sample_dump(0, g->sb_hybrid, 576);
2259 if (s->nb_channels == 2)
2260 compute_stereo(s, &granules[0][gr], &granules[1][gr]);
2262 for(ch=0;ch<s->nb_channels;ch++) {
2263 g = &granules[ch][gr];
2265 reorder_block(s, g);
2267 sample_dump(0, g->sb_hybrid, 576);
2269 s->compute_antialias(s, g);
2271 sample_dump(1, g->sb_hybrid, 576);
2273 compute_imdct(s, g, &s->sb_samples[ch][18 * gr][0], s->mdct_buf[ch]);
2275 sample_dump(2, &s->sb_samples[ch][18 * gr][0], 576);
2279 if(get_bits_count(&s->gb)<0)
2280 skip_bits_long(&s->gb, -get_bits_count(&s->gb));
2281 return nb_granules * 18;
2284 static int mp_decode_frame(MPADecodeContext *s,
2285 OUT_INT *samples, const uint8_t *buf, int buf_size)
2287 int i, nb_frames, ch;
2288 OUT_INT *samples_ptr;
2290 init_get_bits(&s->gb, buf + HEADER_SIZE, (buf_size - HEADER_SIZE)*8);
2292 /* skip error protection field */
2293 if (s->error_protection)
2294 skip_bits(&s->gb, 16);
2296 dprintf(s->avctx, "frame %d:\n", s->frame_count);
2299 s->avctx->frame_size = 384;
2300 nb_frames = mp_decode_layer1(s);
2303 s->avctx->frame_size = 1152;
2304 nb_frames = mp_decode_layer2(s);
2307 s->avctx->frame_size = s->lsf ? 576 : 1152;
2309 nb_frames = mp_decode_layer3(s);
2312 if(s->in_gb.buffer){
2313 align_get_bits(&s->gb);
2314 i= (s->gb.size_in_bits - get_bits_count(&s->gb))>>3;
2315 if(i >= 0 && i <= BACKSTEP_SIZE){
2316 memmove(s->last_buf, s->gb.buffer + (get_bits_count(&s->gb)>>3), i);
2319 av_log(NULL, AV_LOG_ERROR, "invalid old backstep %d\n", i);
2321 s->in_gb.buffer= NULL;
2324 align_get_bits(&s->gb);
2325 assert((get_bits_count(&s->gb) & 7) == 0);
2326 i= (s->gb.size_in_bits - get_bits_count(&s->gb))>>3;
2328 if(i<0 || i > BACKSTEP_SIZE || nb_frames<0){
2329 av_log(NULL, AV_LOG_ERROR, "invalid new backstep %d\n", i);
2330 i= FFMIN(BACKSTEP_SIZE, buf_size - HEADER_SIZE);
2332 assert(i <= buf_size - HEADER_SIZE && i>= 0);
2333 memcpy(s->last_buf + s->last_buf_size, s->gb.buffer + buf_size - HEADER_SIZE - i, i);
2334 s->last_buf_size += i;
2339 for(i=0;i<nb_frames;i++) {
2340 for(ch=0;ch<s->nb_channels;ch++) {
2342 dprintf(s->avctx, "%d-%d:", i, ch);
2343 for(j=0;j<SBLIMIT;j++)
2344 dprintf(s->avctx, " %0.6f", (double)s->sb_samples[ch][i][j] / FRAC_ONE);
2345 dprintf(s->avctx, "\n");
2349 /* apply the synthesis filter */
2350 for(ch=0;ch<s->nb_channels;ch++) {
2351 samples_ptr = samples + ch;
2352 for(i=0;i<nb_frames;i++) {
2353 ff_mpa_synth_filter(s->synth_buf[ch], &(s->synth_buf_offset[ch]),
2354 window, &s->dither_state,
2355 samples_ptr, s->nb_channels,
2356 s->sb_samples[ch][i]);
2357 samples_ptr += 32 * s->nb_channels;
2363 return nb_frames * 32 * sizeof(OUT_INT) * s->nb_channels;
2366 static int decode_frame(AVCodecContext * avctx,
2367 void *data, int *data_size,
2368 const uint8_t * buf, int buf_size)
2370 MPADecodeContext *s = avctx->priv_data;
2373 OUT_INT *out_samples = data;
2376 if(buf_size < HEADER_SIZE)
2379 header = AV_RB32(buf);
2380 if(ff_mpa_check_header(header) < 0){
2383 av_log(avctx, AV_LOG_ERROR, "Header missing skipping one byte.\n");
2387 if (ff_mpegaudio_decode_header(s, header) == 1) {
2388 /* free format: prepare to compute frame size */
2392 /* update codec info */
2393 avctx->channels = s->nb_channels;
2394 avctx->bit_rate = s->bit_rate;
2395 avctx->sub_id = s->layer;
2397 if(s->frame_size<=0 || s->frame_size > buf_size){
2398 av_log(avctx, AV_LOG_ERROR, "incomplete frame\n");
2400 }else if(s->frame_size < buf_size){
2401 av_log(avctx, AV_LOG_ERROR, "incorrect frame size\n");
2402 buf_size= s->frame_size;
2405 out_size = mp_decode_frame(s, out_samples, buf, buf_size);
2407 *data_size = out_size;
2408 avctx->sample_rate = s->sample_rate;
2409 //FIXME maybe move the other codec info stuff from above here too
2411 av_log(avctx, AV_LOG_DEBUG, "Error while decoding MPEG audio frame.\n"); //FIXME return -1 / but also return the number of bytes consumed
2416 static void flush(AVCodecContext *avctx){
2417 MPADecodeContext *s = avctx->priv_data;
2418 memset(s->synth_buf, 0, sizeof(s->synth_buf));
2419 s->last_buf_size= 0;
2422 #ifdef CONFIG_MP3ADU_DECODER
2423 static int decode_frame_adu(AVCodecContext * avctx,
2424 void *data, int *data_size,
2425 const uint8_t * buf, int buf_size)
2427 MPADecodeContext *s = avctx->priv_data;
2430 OUT_INT *out_samples = data;
2434 // Discard too short frames
2435 if (buf_size < HEADER_SIZE) {
2441 if (len > MPA_MAX_CODED_FRAME_SIZE)
2442 len = MPA_MAX_CODED_FRAME_SIZE;
2444 // Get header and restore sync word
2445 header = AV_RB32(buf) | 0xffe00000;
2447 if (ff_mpa_check_header(header) < 0) { // Bad header, discard frame
2452 ff_mpegaudio_decode_header(s, header);
2453 /* update codec info */
2454 avctx->sample_rate = s->sample_rate;
2455 avctx->channels = s->nb_channels;
2456 avctx->bit_rate = s->bit_rate;
2457 avctx->sub_id = s->layer;
2459 s->frame_size = len;
2461 if (avctx->parse_only) {
2462 out_size = buf_size;
2464 out_size = mp_decode_frame(s, out_samples, buf, buf_size);
2467 *data_size = out_size;
2470 #endif /* CONFIG_MP3ADU_DECODER */
2472 #ifdef CONFIG_MP3ON4_DECODER
2475 * Context for MP3On4 decoder
2477 typedef struct MP3On4DecodeContext {
2478 int frames; ///< number of mp3 frames per block (number of mp3 decoder instances)
2479 int syncword; ///< syncword patch
2480 const uint8_t *coff; ///< channels offsets in output buffer
2481 MPADecodeContext *mp3decctx[5]; ///< MPADecodeContext for every decoder instance
2482 } MP3On4DecodeContext;
2484 #include "mpeg4audio.h"
2486 /* Next 3 arrays are indexed by channel config number (passed via codecdata) */
2487 static const uint8_t mp3Frames[8] = {0,1,1,2,3,3,4,5}; /* number of mp3 decoder instances */
2488 /* offsets into output buffer, assume output order is FL FR BL BR C LFE */
2489 static const uint8_t chan_offset[8][5] = {
2494 {2,0,3}, // C FLR BS
2495 {4,0,2}, // C FLR BLRS
2496 {4,0,2,5}, // C FLR BLRS LFE
2497 {4,0,2,6,5}, // C FLR BLRS BLR LFE
2501 static int decode_init_mp3on4(AVCodecContext * avctx)
2503 MP3On4DecodeContext *s = avctx->priv_data;
2504 MPEG4AudioConfig cfg;
2507 if ((avctx->extradata_size < 2) || (avctx->extradata == NULL)) {
2508 av_log(avctx, AV_LOG_ERROR, "Codec extradata missing or too short.\n");
2512 ff_mpeg4audio_get_config(&cfg, avctx->extradata, avctx->extradata_size);
2513 if (!cfg.chan_config || cfg.chan_config > 7) {
2514 av_log(avctx, AV_LOG_ERROR, "Invalid channel config number.\n");
2517 s->frames = mp3Frames[cfg.chan_config];
2518 s->coff = chan_offset[cfg.chan_config];
2519 avctx->channels = ff_mpeg4audio_channels[cfg.chan_config];
2521 if (cfg.sample_rate < 16000)
2522 s->syncword = 0xffe00000;
2524 s->syncword = 0xfff00000;
2526 /* Init the first mp3 decoder in standard way, so that all tables get builded
2527 * We replace avctx->priv_data with the context of the first decoder so that
2528 * decode_init() does not have to be changed.
2529 * Other decoders will be initialized here copying data from the first context
2531 // Allocate zeroed memory for the first decoder context
2532 s->mp3decctx[0] = av_mallocz(sizeof(MPADecodeContext));
2533 // Put decoder context in place to make init_decode() happy
2534 avctx->priv_data = s->mp3decctx[0];
2536 // Restore mp3on4 context pointer
2537 avctx->priv_data = s;
2538 s->mp3decctx[0]->adu_mode = 1; // Set adu mode
2540 /* Create a separate codec/context for each frame (first is already ok).
2541 * Each frame is 1 or 2 channels - up to 5 frames allowed
2543 for (i = 1; i < s->frames; i++) {
2544 s->mp3decctx[i] = av_mallocz(sizeof(MPADecodeContext));
2545 s->mp3decctx[i]->compute_antialias = s->mp3decctx[0]->compute_antialias;
2546 s->mp3decctx[i]->adu_mode = 1;
2547 s->mp3decctx[i]->avctx = avctx;
2554 static int decode_close_mp3on4(AVCodecContext * avctx)
2556 MP3On4DecodeContext *s = avctx->priv_data;
2559 for (i = 0; i < s->frames; i++)
2560 if (s->mp3decctx[i])
2561 av_free(s->mp3decctx[i]);
2567 static int decode_frame_mp3on4(AVCodecContext * avctx,
2568 void *data, int *data_size,
2569 const uint8_t * buf, int buf_size)
2571 MP3On4DecodeContext *s = avctx->priv_data;
2572 MPADecodeContext *m;
2573 int fsize, len = buf_size, out_size = 0;
2575 OUT_INT *out_samples = data;
2576 OUT_INT decoded_buf[MPA_FRAME_SIZE * MPA_MAX_CHANNELS];
2577 OUT_INT *outptr, *bp;
2581 // Discard too short frames
2582 if (buf_size < HEADER_SIZE)
2585 // If only one decoder interleave is not needed
2586 outptr = s->frames == 1 ? out_samples : decoded_buf;
2588 avctx->bit_rate = 0;
2590 for (fr = 0; fr < s->frames; fr++) {
2591 fsize = AV_RB16(buf) >> 4;
2592 fsize = FFMIN3(fsize, len, MPA_MAX_CODED_FRAME_SIZE);
2593 m = s->mp3decctx[fr];
2596 header = (AV_RB32(buf) & 0x000fffff) | s->syncword; // patch header
2598 if (ff_mpa_check_header(header) < 0) // Bad header, discard block
2601 ff_mpegaudio_decode_header(m, header);
2602 out_size += mp_decode_frame(m, outptr, buf, fsize);
2607 n = m->avctx->frame_size*m->nb_channels;
2608 /* interleave output data */
2609 bp = out_samples + s->coff[fr];
2610 if(m->nb_channels == 1) {
2611 for(j = 0; j < n; j++) {
2612 *bp = decoded_buf[j];
2613 bp += avctx->channels;
2616 for(j = 0; j < n; j++) {
2617 bp[0] = decoded_buf[j++];
2618 bp[1] = decoded_buf[j];
2619 bp += avctx->channels;
2623 avctx->bit_rate += m->bit_rate;
2626 /* update codec info */
2627 avctx->sample_rate = s->mp3decctx[0]->sample_rate;
2629 *data_size = out_size;
2632 #endif /* CONFIG_MP3ON4_DECODER */
2634 #ifdef CONFIG_MP2_DECODER
2635 AVCodec mp2_decoder =
2640 sizeof(MPADecodeContext),
2645 CODEC_CAP_PARSE_ONLY,
2647 .long_name= NULL_IF_CONFIG_SMALL("MP2 (MPEG audio layer 2)"),
2650 #ifdef CONFIG_MP3_DECODER
2651 AVCodec mp3_decoder =
2656 sizeof(MPADecodeContext),
2661 CODEC_CAP_PARSE_ONLY,
2663 .long_name= NULL_IF_CONFIG_SMALL("MP3 (MPEG audio layer 3)"),
2666 #ifdef CONFIG_MP3ADU_DECODER
2667 AVCodec mp3adu_decoder =
2672 sizeof(MPADecodeContext),
2677 CODEC_CAP_PARSE_ONLY,
2679 .long_name= NULL_IF_CONFIG_SMALL("ADU (Application Data Unit) MP3 (MPEG audio layer 3)"),
2682 #ifdef CONFIG_MP3ON4_DECODER
2683 AVCodec mp3on4_decoder =
2688 sizeof(MP3On4DecodeContext),
2691 decode_close_mp3on4,
2692 decode_frame_mp3on4,
2694 .long_name= NULL_IF_CONFIG_SMALL("MP3onMP4"),