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_TYPE huff_vlc_tables[
88 0+128+128+128+130+128+154+166+
89 142+204+190+170+542+460+662+414
91 static const int huff_vlc_tables_sizes[16] = {
92 0, 128, 128, 128, 130, 128, 154, 166,
93 142, 204, 190, 170, 542, 460, 662, 414
95 static VLC huff_quad_vlc[2];
96 static VLC_TYPE huff_quad_vlc_tables[128+16][2];
97 static const int huff_quad_vlc_tables_sizes[2] = {
100 /* computed from band_size_long */
101 static uint16_t band_index_long[9][23];
102 /* XXX: free when all decoders are closed */
103 #define TABLE_4_3_SIZE (8191 + 16)*4
104 static int8_t table_4_3_exp[TABLE_4_3_SIZE];
105 static uint32_t table_4_3_value[TABLE_4_3_SIZE];
106 static uint32_t exp_table[512];
107 static uint32_t expval_table[512][16];
108 /* intensity stereo coef table */
109 static int32_t is_table[2][16];
110 static int32_t is_table_lsf[2][2][16];
111 static int32_t csa_table[8][4];
112 static float csa_table_float[8][4];
113 static int32_t mdct_win[8][36];
115 /* lower 2 bits: modulo 3, higher bits: shift */
116 static uint16_t scale_factor_modshift[64];
117 /* [i][j]: 2^(-j/3) * FRAC_ONE * 2^(i+2) / (2^(i+2) - 1) */
118 static int32_t scale_factor_mult[15][3];
119 /* mult table for layer 2 group quantization */
121 #define SCALE_GEN(v) \
122 { FIXR(1.0 * (v)), FIXR(0.7937005259 * (v)), FIXR(0.6299605249 * (v)) }
124 static const int32_t scale_factor_mult2[3][3] = {
125 SCALE_GEN(4.0 / 3.0), /* 3 steps */
126 SCALE_GEN(4.0 / 5.0), /* 5 steps */
127 SCALE_GEN(4.0 / 9.0), /* 9 steps */
130 static DECLARE_ALIGNED_16(MPA_INT, window[512]);
133 * Convert region offsets to region sizes and truncate
134 * size to big_values.
136 void ff_region_offset2size(GranuleDef *g){
138 g->region_size[2] = (576 / 2);
140 k = FFMIN(g->region_size[i], g->big_values);
141 g->region_size[i] = k - j;
146 void ff_init_short_region(MPADecodeContext *s, GranuleDef *g){
147 if (g->block_type == 2)
148 g->region_size[0] = (36 / 2);
150 if (s->sample_rate_index <= 2)
151 g->region_size[0] = (36 / 2);
152 else if (s->sample_rate_index != 8)
153 g->region_size[0] = (54 / 2);
155 g->region_size[0] = (108 / 2);
157 g->region_size[1] = (576 / 2);
160 void ff_init_long_region(MPADecodeContext *s, GranuleDef *g, int ra1, int ra2){
163 band_index_long[s->sample_rate_index][ra1 + 1] >> 1;
164 /* should not overflow */
165 l = FFMIN(ra1 + ra2 + 2, 22);
167 band_index_long[s->sample_rate_index][l] >> 1;
170 void ff_compute_band_indexes(MPADecodeContext *s, GranuleDef *g){
171 if (g->block_type == 2) {
172 if (g->switch_point) {
173 /* if switched mode, we handle the 36 first samples as
174 long blocks. For 8000Hz, we handle the 48 first
175 exponents as long blocks (XXX: check this!) */
176 if (s->sample_rate_index <= 2)
178 else if (s->sample_rate_index != 8)
181 g->long_end = 4; /* 8000 Hz */
183 g->short_start = 2 + (s->sample_rate_index != 8);
194 /* layer 1 unscaling */
195 /* n = number of bits of the mantissa minus 1 */
196 static inline int l1_unscale(int n, int mant, int scale_factor)
201 shift = scale_factor_modshift[scale_factor];
204 val = MUL64(mant + (-1 << n) + 1, scale_factor_mult[n-1][mod]);
206 /* NOTE: at this point, 1 <= shift >= 21 + 15 */
207 return (int)((val + (1LL << (shift - 1))) >> shift);
210 static inline int l2_unscale_group(int steps, int mant, int scale_factor)
214 shift = scale_factor_modshift[scale_factor];
218 val = (mant - (steps >> 1)) * scale_factor_mult2[steps >> 2][mod];
219 /* NOTE: at this point, 0 <= shift <= 21 */
221 val = (val + (1 << (shift - 1))) >> shift;
225 /* compute value^(4/3) * 2^(exponent/4). It normalized to FRAC_BITS */
226 static inline int l3_unscale(int value, int exponent)
231 e = table_4_3_exp [4*value + (exponent&3)];
232 m = table_4_3_value[4*value + (exponent&3)];
233 e -= (exponent >> 2);
237 m = (m + (1 << (e-1))) >> e;
242 /* all integer n^(4/3) computation code */
245 #define POW_FRAC_BITS 24
246 #define POW_FRAC_ONE (1 << POW_FRAC_BITS)
247 #define POW_FIX(a) ((int)((a) * POW_FRAC_ONE))
248 #define POW_MULL(a,b) (((int64_t)(a) * (int64_t)(b)) >> POW_FRAC_BITS)
250 static int dev_4_3_coefs[DEV_ORDER];
253 static int pow_mult3[3] = {
255 POW_FIX(1.25992104989487316476),
256 POW_FIX(1.58740105196819947474),
260 static void int_pow_init(void)
265 for(i=0;i<DEV_ORDER;i++) {
266 a = POW_MULL(a, POW_FIX(4.0 / 3.0) - i * POW_FIX(1.0)) / (i + 1);
267 dev_4_3_coefs[i] = a;
271 #if 0 /* unused, remove? */
272 /* return the mantissa and the binary exponent */
273 static int int_pow(int i, int *exp_ptr)
281 while (a < (1 << (POW_FRAC_BITS - 1))) {
285 a -= (1 << POW_FRAC_BITS);
287 for(j = DEV_ORDER - 1; j >= 0; j--)
288 a1 = POW_MULL(a, dev_4_3_coefs[j] + a1);
289 a = (1 << POW_FRAC_BITS) + a1;
290 /* exponent compute (exact) */
294 a = POW_MULL(a, pow_mult3[er]);
295 while (a >= 2 * POW_FRAC_ONE) {
299 /* convert to float */
300 while (a < POW_FRAC_ONE) {
304 /* now POW_FRAC_ONE <= a < 2 * POW_FRAC_ONE */
305 #if POW_FRAC_BITS > FRAC_BITS
306 a = (a + (1 << (POW_FRAC_BITS - FRAC_BITS - 1))) >> (POW_FRAC_BITS - FRAC_BITS);
307 /* correct overflow */
308 if (a >= 2 * (1 << FRAC_BITS)) {
318 static int decode_init(AVCodecContext * avctx)
320 MPADecodeContext *s = avctx->priv_data;
326 #if defined(USE_HIGHPRECISION) && defined(CONFIG_AUDIO_NONSHORT)
327 avctx->sample_fmt= SAMPLE_FMT_S32;
329 avctx->sample_fmt= SAMPLE_FMT_S16;
331 s->error_resilience= avctx->error_resilience;
333 if(avctx->antialias_algo != FF_AA_FLOAT)
334 s->compute_antialias= compute_antialias_integer;
336 s->compute_antialias= compute_antialias_float;
338 if (!init && !avctx->parse_only) {
341 /* scale factors table for layer 1/2 */
344 /* 1.0 (i = 3) is normalized to 2 ^ FRAC_BITS */
347 scale_factor_modshift[i] = mod | (shift << 2);
350 /* scale factor multiply for layer 1 */
354 norm = ((INT64_C(1) << n) * FRAC_ONE) / ((1 << n) - 1);
355 scale_factor_mult[i][0] = MULL(FIXR(1.0 * 2.0), norm);
356 scale_factor_mult[i][1] = MULL(FIXR(0.7937005259 * 2.0), norm);
357 scale_factor_mult[i][2] = MULL(FIXR(0.6299605249 * 2.0), norm);
358 dprintf(avctx, "%d: norm=%x s=%x %x %x\n",
360 scale_factor_mult[i][0],
361 scale_factor_mult[i][1],
362 scale_factor_mult[i][2]);
365 ff_mpa_synth_init(window);
367 /* huffman decode tables */
370 const HuffTable *h = &mpa_huff_tables[i];
373 uint8_t tmp_bits [512];
374 uint16_t tmp_codes[512];
376 memset(tmp_bits , 0, sizeof(tmp_bits ));
377 memset(tmp_codes, 0, sizeof(tmp_codes));
383 for(x=0;x<xsize;x++) {
384 for(y=0;y<xsize;y++){
385 tmp_bits [(x << 5) | y | ((x&&y)<<4)]= h->bits [j ];
386 tmp_codes[(x << 5) | y | ((x&&y)<<4)]= h->codes[j++];
391 huff_vlc[i].table = huff_vlc_tables+offset;
392 huff_vlc[i].table_allocated = huff_vlc_tables_sizes[i];
393 init_vlc(&huff_vlc[i], 7, 512,
394 tmp_bits, 1, 1, tmp_codes, 2, 2,
395 INIT_VLC_USE_NEW_STATIC);
396 offset += huff_vlc_tables_sizes[i];
398 assert(offset == sizeof(huff_vlc_tables)/(sizeof(VLC_TYPE)*2));
402 huff_quad_vlc[i].table = huff_quad_vlc_tables+offset;
403 huff_quad_vlc[i].table_allocated = huff_quad_vlc_tables_sizes[i];
404 init_vlc(&huff_quad_vlc[i], i == 0 ? 7 : 4, 16,
405 mpa_quad_bits[i], 1, 1, mpa_quad_codes[i], 1, 1,
406 INIT_VLC_USE_NEW_STATIC);
407 offset += huff_quad_vlc_tables_sizes[i];
409 assert(offset == sizeof(huff_quad_vlc_tables)/(sizeof(VLC_TYPE)*2));
414 band_index_long[i][j] = k;
415 k += band_size_long[i][j];
417 band_index_long[i][22] = k;
420 /* compute n ^ (4/3) and store it in mantissa/exp format */
423 for(i=1;i<TABLE_4_3_SIZE;i++) {
426 f = pow((double)(i/4), 4.0 / 3.0) * pow(2, (i&3)*0.25);
428 m = (uint32_t)(fm*(1LL<<31) + 0.5);
429 e+= FRAC_BITS - 31 + 5 - 100;
431 /* normalized to FRAC_BITS */
432 table_4_3_value[i] = m;
433 // av_log(NULL, AV_LOG_DEBUG, "%d %d %f\n", i, m, pow((double)i, 4.0 / 3.0));
434 table_4_3_exp[i] = -e;
436 for(i=0; i<512*16; i++){
437 int exponent= (i>>4);
438 double f= pow(i&15, 4.0 / 3.0) * pow(2, (exponent-400)*0.25 + FRAC_BITS + 5);
439 expval_table[exponent][i&15]= llrint(f);
441 exp_table[exponent]= llrint(f);
448 f = tan((double)i * M_PI / 12.0);
449 v = FIXR(f / (1.0 + f));
454 is_table[1][6 - i] = v;
458 is_table[0][i] = is_table[1][i] = 0.0;
465 e = -(j + 1) * ((i + 1) >> 1);
466 f = pow(2.0, e / 4.0);
468 is_table_lsf[j][k ^ 1][i] = FIXR(f);
469 is_table_lsf[j][k][i] = FIXR(1.0);
470 dprintf(avctx, "is_table_lsf %d %d: %x %x\n",
471 i, j, is_table_lsf[j][0][i], is_table_lsf[j][1][i]);
478 cs = 1.0 / sqrt(1.0 + ci * ci);
480 csa_table[i][0] = FIXHR(cs/4);
481 csa_table[i][1] = FIXHR(ca/4);
482 csa_table[i][2] = FIXHR(ca/4) + FIXHR(cs/4);
483 csa_table[i][3] = FIXHR(ca/4) - FIXHR(cs/4);
484 csa_table_float[i][0] = cs;
485 csa_table_float[i][1] = ca;
486 csa_table_float[i][2] = ca + cs;
487 csa_table_float[i][3] = ca - cs;
488 // printf("%d %d %d %d\n", FIX(cs), FIX(cs-1), FIX(ca), FIX(cs)-FIX(ca));
489 // av_log(NULL, AV_LOG_DEBUG,"%f %f %f %f\n", cs, ca, ca+cs, ca-cs);
492 /* compute mdct windows */
500 d= sin(M_PI * (i + 0.5) / 36.0);
503 else if(i>=24) d= sin(M_PI * (i - 18 + 0.5) / 12.0);
507 else if(i< 12) d= sin(M_PI * (i - 6 + 0.5) / 12.0);
510 //merge last stage of imdct into the window coefficients
511 d*= 0.5 / cos(M_PI*(2*i + 19)/72);
514 mdct_win[j][i/3] = FIXHR((d / (1<<5)));
516 mdct_win[j][i ] = FIXHR((d / (1<<5)));
517 // av_log(NULL, AV_LOG_DEBUG, "%2d %d %f\n", i,j,d / (1<<5));
521 /* NOTE: we do frequency inversion adter the MDCT by changing
522 the sign of the right window coefs */
525 mdct_win[j + 4][i] = mdct_win[j][i];
526 mdct_win[j + 4][i + 1] = -mdct_win[j][i + 1];
532 av_log(avctx, AV_LOG_DEBUG, "win%d=\n", j);
534 av_log(avctx, AV_LOG_DEBUG, "%f, ", (double)mdct_win[j][i] / FRAC_ONE);
535 av_log(avctx, AV_LOG_DEBUG, "\n");
544 if (avctx->codec_id == CODEC_ID_MP3ADU)
549 /* tab[i][j] = 1.0 / (2.0 * cos(pi*(2*k+1) / 2^(6 - j))) */
553 #define COS0_0 FIXHR(0.50060299823519630134/2)
554 #define COS0_1 FIXHR(0.50547095989754365998/2)
555 #define COS0_2 FIXHR(0.51544730992262454697/2)
556 #define COS0_3 FIXHR(0.53104259108978417447/2)
557 #define COS0_4 FIXHR(0.55310389603444452782/2)
558 #define COS0_5 FIXHR(0.58293496820613387367/2)
559 #define COS0_6 FIXHR(0.62250412303566481615/2)
560 #define COS0_7 FIXHR(0.67480834145500574602/2)
561 #define COS0_8 FIXHR(0.74453627100229844977/2)
562 #define COS0_9 FIXHR(0.83934964541552703873/2)
563 #define COS0_10 FIXHR(0.97256823786196069369/2)
564 #define COS0_11 FIXHR(1.16943993343288495515/4)
565 #define COS0_12 FIXHR(1.48416461631416627724/4)
566 #define COS0_13 FIXHR(2.05778100995341155085/8)
567 #define COS0_14 FIXHR(3.40760841846871878570/8)
568 #define COS0_15 FIXHR(10.19000812354805681150/32)
570 #define COS1_0 FIXHR(0.50241928618815570551/2)
571 #define COS1_1 FIXHR(0.52249861493968888062/2)
572 #define COS1_2 FIXHR(0.56694403481635770368/2)
573 #define COS1_3 FIXHR(0.64682178335999012954/2)
574 #define COS1_4 FIXHR(0.78815462345125022473/2)
575 #define COS1_5 FIXHR(1.06067768599034747134/4)
576 #define COS1_6 FIXHR(1.72244709823833392782/4)
577 #define COS1_7 FIXHR(5.10114861868916385802/16)
579 #define COS2_0 FIXHR(0.50979557910415916894/2)
580 #define COS2_1 FIXHR(0.60134488693504528054/2)
581 #define COS2_2 FIXHR(0.89997622313641570463/2)
582 #define COS2_3 FIXHR(2.56291544774150617881/8)
584 #define COS3_0 FIXHR(0.54119610014619698439/2)
585 #define COS3_1 FIXHR(1.30656296487637652785/4)
587 #define COS4_0 FIXHR(0.70710678118654752439/2)
589 /* butterfly operator */
590 #define BF(a, b, c, s)\
592 tmp0 = tab[a] + tab[b];\
593 tmp1 = tab[a] - tab[b];\
595 tab[b] = MULH(tmp1<<(s), c);\
598 #define BF1(a, b, c, d)\
600 BF(a, b, COS4_0, 1);\
601 BF(c, d,-COS4_0, 1);\
605 #define BF2(a, b, c, d)\
607 BF(a, b, COS4_0, 1);\
608 BF(c, d,-COS4_0, 1);\
615 #define ADD(a, b) tab[a] += tab[b]
617 /* DCT32 without 1/sqrt(2) coef zero scaling. */
618 static void dct32(int32_t *out, int32_t *tab)
623 BF( 0, 31, COS0_0 , 1);
624 BF(15, 16, COS0_15, 5);
626 BF( 0, 15, COS1_0 , 1);
627 BF(16, 31,-COS1_0 , 1);
629 BF( 7, 24, COS0_7 , 1);
630 BF( 8, 23, COS0_8 , 1);
632 BF( 7, 8, COS1_7 , 4);
633 BF(23, 24,-COS1_7 , 4);
635 BF( 0, 7, COS2_0 , 1);
636 BF( 8, 15,-COS2_0 , 1);
637 BF(16, 23, COS2_0 , 1);
638 BF(24, 31,-COS2_0 , 1);
640 BF( 3, 28, COS0_3 , 1);
641 BF(12, 19, COS0_12, 2);
643 BF( 3, 12, COS1_3 , 1);
644 BF(19, 28,-COS1_3 , 1);
646 BF( 4, 27, COS0_4 , 1);
647 BF(11, 20, COS0_11, 2);
649 BF( 4, 11, COS1_4 , 1);
650 BF(20, 27,-COS1_4 , 1);
652 BF( 3, 4, COS2_3 , 3);
653 BF(11, 12,-COS2_3 , 3);
654 BF(19, 20, COS2_3 , 3);
655 BF(27, 28,-COS2_3 , 3);
657 BF( 0, 3, COS3_0 , 1);
658 BF( 4, 7,-COS3_0 , 1);
659 BF( 8, 11, COS3_0 , 1);
660 BF(12, 15,-COS3_0 , 1);
661 BF(16, 19, COS3_0 , 1);
662 BF(20, 23,-COS3_0 , 1);
663 BF(24, 27, COS3_0 , 1);
664 BF(28, 31,-COS3_0 , 1);
669 BF( 1, 30, COS0_1 , 1);
670 BF(14, 17, COS0_14, 3);
672 BF( 1, 14, COS1_1 , 1);
673 BF(17, 30,-COS1_1 , 1);
675 BF( 6, 25, COS0_6 , 1);
676 BF( 9, 22, COS0_9 , 1);
678 BF( 6, 9, COS1_6 , 2);
679 BF(22, 25,-COS1_6 , 2);
681 BF( 1, 6, COS2_1 , 1);
682 BF( 9, 14,-COS2_1 , 1);
683 BF(17, 22, COS2_1 , 1);
684 BF(25, 30,-COS2_1 , 1);
687 BF( 2, 29, COS0_2 , 1);
688 BF(13, 18, COS0_13, 3);
690 BF( 2, 13, COS1_2 , 1);
691 BF(18, 29,-COS1_2 , 1);
693 BF( 5, 26, COS0_5 , 1);
694 BF(10, 21, COS0_10, 1);
696 BF( 5, 10, COS1_5 , 2);
697 BF(21, 26,-COS1_5 , 2);
699 BF( 2, 5, COS2_2 , 1);
700 BF(10, 13,-COS2_2 , 1);
701 BF(18, 21, COS2_2 , 1);
702 BF(26, 29,-COS2_2 , 1);
704 BF( 1, 2, COS3_1 , 2);
705 BF( 5, 6,-COS3_1 , 2);
706 BF( 9, 10, COS3_1 , 2);
707 BF(13, 14,-COS3_1 , 2);
708 BF(17, 18, COS3_1 , 2);
709 BF(21, 22,-COS3_1 , 2);
710 BF(25, 26, COS3_1 , 2);
711 BF(29, 30,-COS3_1 , 2);
758 out[ 1] = tab[16] + tab[24];
759 out[17] = tab[17] + tab[25];
760 out[ 9] = tab[18] + tab[26];
761 out[25] = tab[19] + tab[27];
762 out[ 5] = tab[20] + tab[28];
763 out[21] = tab[21] + tab[29];
764 out[13] = tab[22] + tab[30];
765 out[29] = tab[23] + tab[31];
766 out[ 3] = tab[24] + tab[20];
767 out[19] = tab[25] + tab[21];
768 out[11] = tab[26] + tab[22];
769 out[27] = tab[27] + tab[23];
770 out[ 7] = tab[28] + tab[18];
771 out[23] = tab[29] + tab[19];
772 out[15] = tab[30] + tab[17];
778 static inline int round_sample(int *sum)
781 sum1 = (*sum) >> OUT_SHIFT;
782 *sum &= (1<<OUT_SHIFT)-1;
785 else if (sum1 > OUT_MAX)
790 /* signed 16x16 -> 32 multiply add accumulate */
791 #define MACS(rt, ra, rb) MAC16(rt, ra, rb)
793 /* signed 16x16 -> 32 multiply */
794 #define MULS(ra, rb) MUL16(ra, rb)
796 #define MLSS(rt, ra, rb) MLS16(rt, ra, rb)
800 static inline int round_sample(int64_t *sum)
803 sum1 = (int)((*sum) >> OUT_SHIFT);
804 *sum &= (1<<OUT_SHIFT)-1;
807 else if (sum1 > OUT_MAX)
812 # define MULS(ra, rb) MUL64(ra, rb)
813 # define MACS(rt, ra, rb) MAC64(rt, ra, rb)
814 # define MLSS(rt, ra, rb) MLS64(rt, ra, rb)
817 #define SUM8(op, sum, w, p) \
819 op(sum, (w)[0 * 64], p[0 * 64]); \
820 op(sum, (w)[1 * 64], p[1 * 64]); \
821 op(sum, (w)[2 * 64], p[2 * 64]); \
822 op(sum, (w)[3 * 64], p[3 * 64]); \
823 op(sum, (w)[4 * 64], p[4 * 64]); \
824 op(sum, (w)[5 * 64], p[5 * 64]); \
825 op(sum, (w)[6 * 64], p[6 * 64]); \
826 op(sum, (w)[7 * 64], p[7 * 64]); \
829 #define SUM8P2(sum1, op1, sum2, op2, w1, w2, p) \
833 op1(sum1, (w1)[0 * 64], tmp);\
834 op2(sum2, (w2)[0 * 64], tmp);\
836 op1(sum1, (w1)[1 * 64], tmp);\
837 op2(sum2, (w2)[1 * 64], tmp);\
839 op1(sum1, (w1)[2 * 64], tmp);\
840 op2(sum2, (w2)[2 * 64], tmp);\
842 op1(sum1, (w1)[3 * 64], tmp);\
843 op2(sum2, (w2)[3 * 64], tmp);\
845 op1(sum1, (w1)[4 * 64], tmp);\
846 op2(sum2, (w2)[4 * 64], tmp);\
848 op1(sum1, (w1)[5 * 64], tmp);\
849 op2(sum2, (w2)[5 * 64], tmp);\
851 op1(sum1, (w1)[6 * 64], tmp);\
852 op2(sum2, (w2)[6 * 64], tmp);\
854 op1(sum1, (w1)[7 * 64], tmp);\
855 op2(sum2, (w2)[7 * 64], tmp);\
858 void ff_mpa_synth_init(MPA_INT *window)
862 /* max = 18760, max sum over all 16 coefs : 44736 */
865 v = ff_mpa_enwindow[i];
867 v = (v + (1 << (16 - WFRAC_BITS - 1))) >> (16 - WFRAC_BITS);
877 /* 32 sub band synthesis filter. Input: 32 sub band samples, Output:
879 /* XXX: optimize by avoiding ring buffer usage */
880 void ff_mpa_synth_filter(MPA_INT *synth_buf_ptr, int *synth_buf_offset,
881 MPA_INT *window, int *dither_state,
882 OUT_INT *samples, int incr,
883 int32_t sb_samples[SBLIMIT])
886 register MPA_INT *synth_buf;
887 register const MPA_INT *w, *w2, *p;
896 dct32(tmp, sb_samples);
898 offset = *synth_buf_offset;
899 synth_buf = synth_buf_ptr + offset;
904 /* NOTE: can cause a loss in precision if very high amplitude
906 v = av_clip_int16(v);
910 /* copy to avoid wrap */
911 memcpy(synth_buf + 512, synth_buf, 32 * sizeof(MPA_INT));
913 samples2 = samples + 31 * incr;
919 SUM8(MACS, sum, w, p);
921 SUM8(MLSS, sum, w + 32, p);
922 *samples = round_sample(&sum);
926 /* we calculate two samples at the same time to avoid one memory
927 access per two sample */
930 p = synth_buf + 16 + j;
931 SUM8P2(sum, MACS, sum2, MLSS, w, w2, p);
932 p = synth_buf + 48 - j;
933 SUM8P2(sum, MLSS, sum2, MLSS, w + 32, w2 + 32, p);
935 *samples = round_sample(&sum);
938 *samples2 = round_sample(&sum);
945 SUM8(MLSS, sum, w + 32, p);
946 *samples = round_sample(&sum);
949 offset = (offset - 32) & 511;
950 *synth_buf_offset = offset;
953 #define C3 FIXHR(0.86602540378443864676/2)
955 /* 0.5 / cos(pi*(2*i+1)/36) */
956 static const int icos36[9] = {
957 FIXR(0.50190991877167369479),
958 FIXR(0.51763809020504152469), //0
959 FIXR(0.55168895948124587824),
960 FIXR(0.61038729438072803416),
961 FIXR(0.70710678118654752439), //1
962 FIXR(0.87172339781054900991),
963 FIXR(1.18310079157624925896),
964 FIXR(1.93185165257813657349), //2
965 FIXR(5.73685662283492756461),
968 /* 0.5 / cos(pi*(2*i+1)/36) */
969 static const int icos36h[9] = {
970 FIXHR(0.50190991877167369479/2),
971 FIXHR(0.51763809020504152469/2), //0
972 FIXHR(0.55168895948124587824/2),
973 FIXHR(0.61038729438072803416/2),
974 FIXHR(0.70710678118654752439/2), //1
975 FIXHR(0.87172339781054900991/2),
976 FIXHR(1.18310079157624925896/4),
977 FIXHR(1.93185165257813657349/4), //2
978 // FIXHR(5.73685662283492756461),
981 /* 12 points IMDCT. We compute it "by hand" by factorizing obvious
983 static void imdct12(int *out, int *in)
985 int in0, in1, in2, in3, in4, in5, t1, t2;
988 in1= in[1*3] + in[0*3];
989 in2= in[2*3] + in[1*3];
990 in3= in[3*3] + in[2*3];
991 in4= in[4*3] + in[3*3];
992 in5= in[5*3] + in[4*3];
996 in2= MULH(2*in2, C3);
997 in3= MULH(4*in3, C3);
1000 t2 = MULH(2*(in1 - in5), icos36h[4]);
1010 in1 = MULH(in5 + in3, icos36h[1]);
1017 in5 = MULH(2*(in5 - in3), icos36h[7]);
1025 #define C1 FIXHR(0.98480775301220805936/2)
1026 #define C2 FIXHR(0.93969262078590838405/2)
1027 #define C3 FIXHR(0.86602540378443864676/2)
1028 #define C4 FIXHR(0.76604444311897803520/2)
1029 #define C5 FIXHR(0.64278760968653932632/2)
1030 #define C6 FIXHR(0.5/2)
1031 #define C7 FIXHR(0.34202014332566873304/2)
1032 #define C8 FIXHR(0.17364817766693034885/2)
1035 /* using Lee like decomposition followed by hand coded 9 points DCT */
1036 static void imdct36(int *out, int *buf, int *in, int *win)
1038 int i, j, t0, t1, t2, t3, s0, s1, s2, s3;
1039 int tmp[18], *tmp1, *in1;
1050 //more accurate but slower
1051 int64_t t0, t1, t2, t3;
1052 t2 = in1[2*4] + in1[2*8] - in1[2*2];
1054 t3 = (in1[2*0] + (int64_t)(in1[2*6]>>1))<<32;
1055 t1 = in1[2*0] - in1[2*6];
1056 tmp1[ 6] = t1 - (t2>>1);
1059 t0 = MUL64(2*(in1[2*2] + in1[2*4]), C2);
1060 t1 = MUL64( in1[2*4] - in1[2*8] , -2*C8);
1061 t2 = MUL64(2*(in1[2*2] + in1[2*8]), -C4);
1063 tmp1[10] = (t3 - t0 - t2) >> 32;
1064 tmp1[ 2] = (t3 + t0 + t1) >> 32;
1065 tmp1[14] = (t3 + t2 - t1) >> 32;
1067 tmp1[ 4] = MULH(2*(in1[2*5] + in1[2*7] - in1[2*1]), -C3);
1068 t2 = MUL64(2*(in1[2*1] + in1[2*5]), C1);
1069 t3 = MUL64( in1[2*5] - in1[2*7] , -2*C7);
1070 t0 = MUL64(2*in1[2*3], C3);
1072 t1 = MUL64(2*(in1[2*1] + in1[2*7]), -C5);
1074 tmp1[ 0] = (t2 + t3 + t0) >> 32;
1075 tmp1[12] = (t2 + t1 - t0) >> 32;
1076 tmp1[ 8] = (t3 - t1 - t0) >> 32;
1078 t2 = in1[2*4] + in1[2*8] - in1[2*2];
1080 t3 = in1[2*0] + (in1[2*6]>>1);
1081 t1 = in1[2*0] - in1[2*6];
1082 tmp1[ 6] = t1 - (t2>>1);
1085 t0 = MULH(2*(in1[2*2] + in1[2*4]), C2);
1086 t1 = MULH( in1[2*4] - in1[2*8] , -2*C8);
1087 t2 = MULH(2*(in1[2*2] + in1[2*8]), -C4);
1089 tmp1[10] = t3 - t0 - t2;
1090 tmp1[ 2] = t3 + t0 + t1;
1091 tmp1[14] = t3 + t2 - t1;
1093 tmp1[ 4] = MULH(2*(in1[2*5] + in1[2*7] - in1[2*1]), -C3);
1094 t2 = MULH(2*(in1[2*1] + in1[2*5]), C1);
1095 t3 = MULH( in1[2*5] - in1[2*7] , -2*C7);
1096 t0 = MULH(2*in1[2*3], C3);
1098 t1 = MULH(2*(in1[2*1] + in1[2*7]), -C5);
1100 tmp1[ 0] = t2 + t3 + t0;
1101 tmp1[12] = t2 + t1 - t0;
1102 tmp1[ 8] = t3 - t1 - t0;
1115 s1 = MULH(2*(t3 + t2), icos36h[j]);
1116 s3 = MULL(t3 - t2, icos36[8 - j]);
1120 out[(9 + j)*SBLIMIT] = MULH(t1, win[9 + j]) + buf[9 + j];
1121 out[(8 - j)*SBLIMIT] = MULH(t1, win[8 - j]) + buf[8 - j];
1122 buf[9 + j] = MULH(t0, win[18 + 9 + j]);
1123 buf[8 - j] = MULH(t0, win[18 + 8 - j]);
1127 out[(9 + 8 - j)*SBLIMIT] = MULH(t1, win[9 + 8 - j]) + buf[9 + 8 - j];
1128 out[( j)*SBLIMIT] = MULH(t1, win[ j]) + buf[ j];
1129 buf[9 + 8 - j] = MULH(t0, win[18 + 9 + 8 - j]);
1130 buf[ + j] = MULH(t0, win[18 + j]);
1135 s1 = MULH(2*tmp[17], icos36h[4]);
1138 out[(9 + 4)*SBLIMIT] = MULH(t1, win[9 + 4]) + buf[9 + 4];
1139 out[(8 - 4)*SBLIMIT] = MULH(t1, win[8 - 4]) + buf[8 - 4];
1140 buf[9 + 4] = MULH(t0, win[18 + 9 + 4]);
1141 buf[8 - 4] = MULH(t0, win[18 + 8 - 4]);
1144 /* return the number of decoded frames */
1145 static int mp_decode_layer1(MPADecodeContext *s)
1147 int bound, i, v, n, ch, j, mant;
1148 uint8_t allocation[MPA_MAX_CHANNELS][SBLIMIT];
1149 uint8_t scale_factors[MPA_MAX_CHANNELS][SBLIMIT];
1151 if (s->mode == MPA_JSTEREO)
1152 bound = (s->mode_ext + 1) * 4;
1156 /* allocation bits */
1157 for(i=0;i<bound;i++) {
1158 for(ch=0;ch<s->nb_channels;ch++) {
1159 allocation[ch][i] = get_bits(&s->gb, 4);
1162 for(i=bound;i<SBLIMIT;i++) {
1163 allocation[0][i] = get_bits(&s->gb, 4);
1167 for(i=0;i<bound;i++) {
1168 for(ch=0;ch<s->nb_channels;ch++) {
1169 if (allocation[ch][i])
1170 scale_factors[ch][i] = get_bits(&s->gb, 6);
1173 for(i=bound;i<SBLIMIT;i++) {
1174 if (allocation[0][i]) {
1175 scale_factors[0][i] = get_bits(&s->gb, 6);
1176 scale_factors[1][i] = get_bits(&s->gb, 6);
1180 /* compute samples */
1182 for(i=0;i<bound;i++) {
1183 for(ch=0;ch<s->nb_channels;ch++) {
1184 n = allocation[ch][i];
1186 mant = get_bits(&s->gb, n + 1);
1187 v = l1_unscale(n, mant, scale_factors[ch][i]);
1191 s->sb_samples[ch][j][i] = v;
1194 for(i=bound;i<SBLIMIT;i++) {
1195 n = allocation[0][i];
1197 mant = get_bits(&s->gb, n + 1);
1198 v = l1_unscale(n, mant, scale_factors[0][i]);
1199 s->sb_samples[0][j][i] = v;
1200 v = l1_unscale(n, mant, scale_factors[1][i]);
1201 s->sb_samples[1][j][i] = v;
1203 s->sb_samples[0][j][i] = 0;
1204 s->sb_samples[1][j][i] = 0;
1211 static int mp_decode_layer2(MPADecodeContext *s)
1213 int sblimit; /* number of used subbands */
1214 const unsigned char *alloc_table;
1215 int table, bit_alloc_bits, i, j, ch, bound, v;
1216 unsigned char bit_alloc[MPA_MAX_CHANNELS][SBLIMIT];
1217 unsigned char scale_code[MPA_MAX_CHANNELS][SBLIMIT];
1218 unsigned char scale_factors[MPA_MAX_CHANNELS][SBLIMIT][3], *sf;
1219 int scale, qindex, bits, steps, k, l, m, b;
1221 /* select decoding table */
1222 table = ff_mpa_l2_select_table(s->bit_rate / 1000, s->nb_channels,
1223 s->sample_rate, s->lsf);
1224 sblimit = ff_mpa_sblimit_table[table];
1225 alloc_table = ff_mpa_alloc_tables[table];
1227 if (s->mode == MPA_JSTEREO)
1228 bound = (s->mode_ext + 1) * 4;
1232 dprintf(s->avctx, "bound=%d sblimit=%d\n", bound, sblimit);
1235 if( bound > sblimit ) bound = sblimit;
1237 /* parse bit allocation */
1239 for(i=0;i<bound;i++) {
1240 bit_alloc_bits = alloc_table[j];
1241 for(ch=0;ch<s->nb_channels;ch++) {
1242 bit_alloc[ch][i] = get_bits(&s->gb, bit_alloc_bits);
1244 j += 1 << bit_alloc_bits;
1246 for(i=bound;i<sblimit;i++) {
1247 bit_alloc_bits = alloc_table[j];
1248 v = get_bits(&s->gb, bit_alloc_bits);
1249 bit_alloc[0][i] = v;
1250 bit_alloc[1][i] = v;
1251 j += 1 << bit_alloc_bits;
1256 for(ch=0;ch<s->nb_channels;ch++) {
1257 for(i=0;i<sblimit;i++)
1258 dprintf(s->avctx, " %d", bit_alloc[ch][i]);
1259 dprintf(s->avctx, "\n");
1265 for(i=0;i<sblimit;i++) {
1266 for(ch=0;ch<s->nb_channels;ch++) {
1267 if (bit_alloc[ch][i])
1268 scale_code[ch][i] = get_bits(&s->gb, 2);
1273 for(i=0;i<sblimit;i++) {
1274 for(ch=0;ch<s->nb_channels;ch++) {
1275 if (bit_alloc[ch][i]) {
1276 sf = scale_factors[ch][i];
1277 switch(scale_code[ch][i]) {
1280 sf[0] = get_bits(&s->gb, 6);
1281 sf[1] = get_bits(&s->gb, 6);
1282 sf[2] = get_bits(&s->gb, 6);
1285 sf[0] = get_bits(&s->gb, 6);
1290 sf[0] = get_bits(&s->gb, 6);
1291 sf[2] = get_bits(&s->gb, 6);
1295 sf[0] = get_bits(&s->gb, 6);
1296 sf[2] = get_bits(&s->gb, 6);
1305 for(ch=0;ch<s->nb_channels;ch++) {
1306 for(i=0;i<sblimit;i++) {
1307 if (bit_alloc[ch][i]) {
1308 sf = scale_factors[ch][i];
1309 dprintf(s->avctx, " %d %d %d", sf[0], sf[1], sf[2]);
1311 dprintf(s->avctx, " -");
1314 dprintf(s->avctx, "\n");
1320 for(l=0;l<12;l+=3) {
1322 for(i=0;i<bound;i++) {
1323 bit_alloc_bits = alloc_table[j];
1324 for(ch=0;ch<s->nb_channels;ch++) {
1325 b = bit_alloc[ch][i];
1327 scale = scale_factors[ch][i][k];
1328 qindex = alloc_table[j+b];
1329 bits = ff_mpa_quant_bits[qindex];
1331 /* 3 values at the same time */
1332 v = get_bits(&s->gb, -bits);
1333 steps = ff_mpa_quant_steps[qindex];
1334 s->sb_samples[ch][k * 12 + l + 0][i] =
1335 l2_unscale_group(steps, v % steps, scale);
1337 s->sb_samples[ch][k * 12 + l + 1][i] =
1338 l2_unscale_group(steps, v % steps, scale);
1340 s->sb_samples[ch][k * 12 + l + 2][i] =
1341 l2_unscale_group(steps, v, scale);
1344 v = get_bits(&s->gb, bits);
1345 v = l1_unscale(bits - 1, v, scale);
1346 s->sb_samples[ch][k * 12 + l + m][i] = v;
1350 s->sb_samples[ch][k * 12 + l + 0][i] = 0;
1351 s->sb_samples[ch][k * 12 + l + 1][i] = 0;
1352 s->sb_samples[ch][k * 12 + l + 2][i] = 0;
1355 /* next subband in alloc table */
1356 j += 1 << bit_alloc_bits;
1358 /* XXX: find a way to avoid this duplication of code */
1359 for(i=bound;i<sblimit;i++) {
1360 bit_alloc_bits = alloc_table[j];
1361 b = bit_alloc[0][i];
1363 int mant, scale0, scale1;
1364 scale0 = scale_factors[0][i][k];
1365 scale1 = scale_factors[1][i][k];
1366 qindex = alloc_table[j+b];
1367 bits = ff_mpa_quant_bits[qindex];
1369 /* 3 values at the same time */
1370 v = get_bits(&s->gb, -bits);
1371 steps = ff_mpa_quant_steps[qindex];
1374 s->sb_samples[0][k * 12 + l + 0][i] =
1375 l2_unscale_group(steps, mant, scale0);
1376 s->sb_samples[1][k * 12 + l + 0][i] =
1377 l2_unscale_group(steps, mant, scale1);
1380 s->sb_samples[0][k * 12 + l + 1][i] =
1381 l2_unscale_group(steps, mant, scale0);
1382 s->sb_samples[1][k * 12 + l + 1][i] =
1383 l2_unscale_group(steps, mant, scale1);
1384 s->sb_samples[0][k * 12 + l + 2][i] =
1385 l2_unscale_group(steps, v, scale0);
1386 s->sb_samples[1][k * 12 + l + 2][i] =
1387 l2_unscale_group(steps, v, scale1);
1390 mant = get_bits(&s->gb, bits);
1391 s->sb_samples[0][k * 12 + l + m][i] =
1392 l1_unscale(bits - 1, mant, scale0);
1393 s->sb_samples[1][k * 12 + l + m][i] =
1394 l1_unscale(bits - 1, mant, scale1);
1398 s->sb_samples[0][k * 12 + l + 0][i] = 0;
1399 s->sb_samples[0][k * 12 + l + 1][i] = 0;
1400 s->sb_samples[0][k * 12 + l + 2][i] = 0;
1401 s->sb_samples[1][k * 12 + l + 0][i] = 0;
1402 s->sb_samples[1][k * 12 + l + 1][i] = 0;
1403 s->sb_samples[1][k * 12 + l + 2][i] = 0;
1405 /* next subband in alloc table */
1406 j += 1 << bit_alloc_bits;
1408 /* fill remaining samples to zero */
1409 for(i=sblimit;i<SBLIMIT;i++) {
1410 for(ch=0;ch<s->nb_channels;ch++) {
1411 s->sb_samples[ch][k * 12 + l + 0][i] = 0;
1412 s->sb_samples[ch][k * 12 + l + 1][i] = 0;
1413 s->sb_samples[ch][k * 12 + l + 2][i] = 0;
1421 static inline void lsf_sf_expand(int *slen,
1422 int sf, int n1, int n2, int n3)
1441 static void exponents_from_scale_factors(MPADecodeContext *s,
1445 const uint8_t *bstab, *pretab;
1446 int len, i, j, k, l, v0, shift, gain, gains[3];
1449 exp_ptr = exponents;
1450 gain = g->global_gain - 210;
1451 shift = g->scalefac_scale + 1;
1453 bstab = band_size_long[s->sample_rate_index];
1454 pretab = mpa_pretab[g->preflag];
1455 for(i=0;i<g->long_end;i++) {
1456 v0 = gain - ((g->scale_factors[i] + pretab[i]) << shift) + 400;
1462 if (g->short_start < 13) {
1463 bstab = band_size_short[s->sample_rate_index];
1464 gains[0] = gain - (g->subblock_gain[0] << 3);
1465 gains[1] = gain - (g->subblock_gain[1] << 3);
1466 gains[2] = gain - (g->subblock_gain[2] << 3);
1468 for(i=g->short_start;i<13;i++) {
1471 v0 = gains[l] - (g->scale_factors[k++] << shift) + 400;
1479 /* handle n = 0 too */
1480 static inline int get_bitsz(GetBitContext *s, int n)
1485 return get_bits(s, n);
1489 static void switch_buffer(MPADecodeContext *s, int *pos, int *end_pos, int *end_pos2){
1490 if(s->in_gb.buffer && *pos >= s->gb.size_in_bits){
1492 s->in_gb.buffer=NULL;
1493 assert((get_bits_count(&s->gb) & 7) == 0);
1494 skip_bits_long(&s->gb, *pos - *end_pos);
1496 *end_pos= *end_pos2 + get_bits_count(&s->gb) - *pos;
1497 *pos= get_bits_count(&s->gb);
1501 static int huffman_decode(MPADecodeContext *s, GranuleDef *g,
1502 int16_t *exponents, int end_pos2)
1506 int last_pos, bits_left;
1508 int end_pos= FFMIN(end_pos2, s->gb.size_in_bits);
1510 /* low frequencies (called big values) */
1513 int j, k, l, linbits;
1514 j = g->region_size[i];
1517 /* select vlc table */
1518 k = g->table_select[i];
1519 l = mpa_huff_data[k][0];
1520 linbits = mpa_huff_data[k][1];
1524 memset(&g->sb_hybrid[s_index], 0, sizeof(*g->sb_hybrid)*2*j);
1529 /* read huffcode and compute each couple */
1531 int exponent, x, y, v;
1532 int pos= get_bits_count(&s->gb);
1534 if (pos >= end_pos){
1535 // av_log(NULL, AV_LOG_ERROR, "pos: %d %d %d %d\n", pos, end_pos, end_pos2, s_index);
1536 switch_buffer(s, &pos, &end_pos, &end_pos2);
1537 // av_log(NULL, AV_LOG_ERROR, "new pos: %d %d\n", pos, end_pos);
1541 y = get_vlc2(&s->gb, vlc->table, 7, 3);
1544 g->sb_hybrid[s_index ] =
1545 g->sb_hybrid[s_index+1] = 0;
1550 exponent= exponents[s_index];
1552 dprintf(s->avctx, "region=%d n=%d x=%d y=%d exp=%d\n",
1553 i, g->region_size[i] - j, x, y, exponent);
1558 v = expval_table[ exponent ][ x ];
1559 // v = expval_table[ (exponent&3) ][ x ] >> FFMIN(0 - (exponent>>2), 31);
1561 x += get_bitsz(&s->gb, linbits);
1562 v = l3_unscale(x, exponent);
1564 if (get_bits1(&s->gb))
1566 g->sb_hybrid[s_index] = v;
1568 v = expval_table[ exponent ][ y ];
1570 y += get_bitsz(&s->gb, linbits);
1571 v = l3_unscale(y, exponent);
1573 if (get_bits1(&s->gb))
1575 g->sb_hybrid[s_index+1] = v;
1581 v = expval_table[ exponent ][ x ];
1583 x += get_bitsz(&s->gb, linbits);
1584 v = l3_unscale(x, exponent);
1586 if (get_bits1(&s->gb))
1588 g->sb_hybrid[s_index+!!y] = v;
1589 g->sb_hybrid[s_index+ !y] = 0;
1595 /* high frequencies */
1596 vlc = &huff_quad_vlc[g->count1table_select];
1598 while (s_index <= 572) {
1600 pos = get_bits_count(&s->gb);
1601 if (pos >= end_pos) {
1602 if (pos > end_pos2 && last_pos){
1603 /* some encoders generate an incorrect size for this
1604 part. We must go back into the data */
1606 skip_bits_long(&s->gb, last_pos - pos);
1607 av_log(s->avctx, AV_LOG_INFO, "overread, skip %d enddists: %d %d\n", last_pos - pos, end_pos-pos, end_pos2-pos);
1608 if(s->error_resilience >= FF_ER_COMPLIANT)
1612 // av_log(NULL, AV_LOG_ERROR, "pos2: %d %d %d %d\n", pos, end_pos, end_pos2, s_index);
1613 switch_buffer(s, &pos, &end_pos, &end_pos2);
1614 // av_log(NULL, AV_LOG_ERROR, "new pos2: %d %d %d\n", pos, end_pos, s_index);
1620 code = get_vlc2(&s->gb, vlc->table, vlc->bits, 1);
1621 dprintf(s->avctx, "t=%d code=%d\n", g->count1table_select, code);
1622 g->sb_hybrid[s_index+0]=
1623 g->sb_hybrid[s_index+1]=
1624 g->sb_hybrid[s_index+2]=
1625 g->sb_hybrid[s_index+3]= 0;
1627 static const int idxtab[16]={3,3,2,2,1,1,1,1,0,0,0,0,0,0,0,0};
1629 int pos= s_index+idxtab[code];
1630 code ^= 8>>idxtab[code];
1631 v = exp_table[ exponents[pos] ];
1632 // v = exp_table[ (exponents[pos]&3) ] >> FFMIN(0 - (exponents[pos]>>2), 31);
1633 if(get_bits1(&s->gb))
1635 g->sb_hybrid[pos] = v;
1639 /* skip extension bits */
1640 bits_left = end_pos2 - get_bits_count(&s->gb);
1641 //av_log(NULL, AV_LOG_ERROR, "left:%d buf:%p\n", bits_left, s->in_gb.buffer);
1642 if (bits_left < 0/* || bits_left > 500*/) {
1643 av_log(s->avctx, AV_LOG_ERROR, "bits_left=%d\n", bits_left);
1645 }else if(bits_left > 0 && s->error_resilience >= FF_ER_AGGRESSIVE){
1646 av_log(s->avctx, AV_LOG_ERROR, "bits_left=%d\n", bits_left);
1649 memset(&g->sb_hybrid[s_index], 0, sizeof(*g->sb_hybrid)*(576 - s_index));
1650 skip_bits_long(&s->gb, bits_left);
1652 i= get_bits_count(&s->gb);
1653 switch_buffer(s, &i, &end_pos, &end_pos2);
1658 /* Reorder short blocks from bitstream order to interleaved order. It
1659 would be faster to do it in parsing, but the code would be far more
1661 static void reorder_block(MPADecodeContext *s, GranuleDef *g)
1664 int32_t *ptr, *dst, *ptr1;
1667 if (g->block_type != 2)
1670 if (g->switch_point) {
1671 if (s->sample_rate_index != 8) {
1672 ptr = g->sb_hybrid + 36;
1674 ptr = g->sb_hybrid + 48;
1680 for(i=g->short_start;i<13;i++) {
1681 len = band_size_short[s->sample_rate_index][i];
1684 for(j=len;j>0;j--) {
1685 *dst++ = ptr[0*len];
1686 *dst++ = ptr[1*len];
1687 *dst++ = ptr[2*len];
1691 memcpy(ptr1, tmp, len * 3 * sizeof(*ptr1));
1695 #define ISQRT2 FIXR(0.70710678118654752440)
1697 static void compute_stereo(MPADecodeContext *s,
1698 GranuleDef *g0, GranuleDef *g1)
1702 int sf_max, tmp0, tmp1, sf, len, non_zero_found;
1703 int32_t (*is_tab)[16];
1704 int32_t *tab0, *tab1;
1705 int non_zero_found_short[3];
1707 /* intensity stereo */
1708 if (s->mode_ext & MODE_EXT_I_STEREO) {
1713 is_tab = is_table_lsf[g1->scalefac_compress & 1];
1717 tab0 = g0->sb_hybrid + 576;
1718 tab1 = g1->sb_hybrid + 576;
1720 non_zero_found_short[0] = 0;
1721 non_zero_found_short[1] = 0;
1722 non_zero_found_short[2] = 0;
1723 k = (13 - g1->short_start) * 3 + g1->long_end - 3;
1724 for(i = 12;i >= g1->short_start;i--) {
1725 /* for last band, use previous scale factor */
1728 len = band_size_short[s->sample_rate_index][i];
1732 if (!non_zero_found_short[l]) {
1733 /* test if non zero band. if so, stop doing i-stereo */
1734 for(j=0;j<len;j++) {
1736 non_zero_found_short[l] = 1;
1740 sf = g1->scale_factors[k + l];
1746 for(j=0;j<len;j++) {
1748 tab0[j] = MULL(tmp0, v1);
1749 tab1[j] = MULL(tmp0, v2);
1753 if (s->mode_ext & MODE_EXT_MS_STEREO) {
1754 /* lower part of the spectrum : do ms stereo
1756 for(j=0;j<len;j++) {
1759 tab0[j] = MULL(tmp0 + tmp1, ISQRT2);
1760 tab1[j] = MULL(tmp0 - tmp1, ISQRT2);
1767 non_zero_found = non_zero_found_short[0] |
1768 non_zero_found_short[1] |
1769 non_zero_found_short[2];
1771 for(i = g1->long_end - 1;i >= 0;i--) {
1772 len = band_size_long[s->sample_rate_index][i];
1775 /* test if non zero band. if so, stop doing i-stereo */
1776 if (!non_zero_found) {
1777 for(j=0;j<len;j++) {
1783 /* for last band, use previous scale factor */
1784 k = (i == 21) ? 20 : i;
1785 sf = g1->scale_factors[k];
1790 for(j=0;j<len;j++) {
1792 tab0[j] = MULL(tmp0, v1);
1793 tab1[j] = MULL(tmp0, v2);
1797 if (s->mode_ext & MODE_EXT_MS_STEREO) {
1798 /* lower part of the spectrum : do ms stereo
1800 for(j=0;j<len;j++) {
1803 tab0[j] = MULL(tmp0 + tmp1, ISQRT2);
1804 tab1[j] = MULL(tmp0 - tmp1, ISQRT2);
1809 } else if (s->mode_ext & MODE_EXT_MS_STEREO) {
1810 /* ms stereo ONLY */
1811 /* NOTE: the 1/sqrt(2) normalization factor is included in the
1813 tab0 = g0->sb_hybrid;
1814 tab1 = g1->sb_hybrid;
1815 for(i=0;i<576;i++) {
1818 tab0[i] = tmp0 + tmp1;
1819 tab1[i] = tmp0 - tmp1;
1824 static void compute_antialias_integer(MPADecodeContext *s,
1830 /* we antialias only "long" bands */
1831 if (g->block_type == 2) {
1832 if (!g->switch_point)
1834 /* XXX: check this for 8000Hz case */
1840 ptr = g->sb_hybrid + 18;
1841 for(i = n;i > 0;i--) {
1842 int tmp0, tmp1, tmp2;
1843 csa = &csa_table[0][0];
1847 tmp2= MULH(tmp0 + tmp1, csa[0+4*j]);\
1848 ptr[-1-j] = 4*(tmp2 - MULH(tmp1, csa[2+4*j]));\
1849 ptr[ j] = 4*(tmp2 + MULH(tmp0, csa[3+4*j]));
1864 static void compute_antialias_float(MPADecodeContext *s,
1870 /* we antialias only "long" bands */
1871 if (g->block_type == 2) {
1872 if (!g->switch_point)
1874 /* XXX: check this for 8000Hz case */
1880 ptr = g->sb_hybrid + 18;
1881 for(i = n;i > 0;i--) {
1883 float *csa = &csa_table_float[0][0];
1884 #define FLOAT_AA(j)\
1887 ptr[-1-j] = lrintf(tmp0 * csa[0+4*j] - tmp1 * csa[1+4*j]);\
1888 ptr[ j] = lrintf(tmp0 * csa[1+4*j] + tmp1 * csa[0+4*j]);
1903 static void compute_imdct(MPADecodeContext *s,
1905 int32_t *sb_samples,
1908 int32_t *ptr, *win, *win1, *buf, *out_ptr, *ptr1;
1910 int i, j, mdct_long_end, v, sblimit;
1912 /* find last non zero block */
1913 ptr = g->sb_hybrid + 576;
1914 ptr1 = g->sb_hybrid + 2 * 18;
1915 while (ptr >= ptr1) {
1917 v = ptr[0] | ptr[1] | ptr[2] | ptr[3] | ptr[4] | ptr[5];
1921 sblimit = ((ptr - g->sb_hybrid) / 18) + 1;
1923 if (g->block_type == 2) {
1924 /* XXX: check for 8000 Hz */
1925 if (g->switch_point)
1930 mdct_long_end = sblimit;
1935 for(j=0;j<mdct_long_end;j++) {
1936 /* apply window & overlap with previous buffer */
1937 out_ptr = sb_samples + j;
1939 if (g->switch_point && j < 2)
1942 win1 = mdct_win[g->block_type];
1943 /* select frequency inversion */
1944 win = win1 + ((4 * 36) & -(j & 1));
1945 imdct36(out_ptr, buf, ptr, win);
1946 out_ptr += 18*SBLIMIT;
1950 for(j=mdct_long_end;j<sblimit;j++) {
1951 /* select frequency inversion */
1952 win = mdct_win[2] + ((4 * 36) & -(j & 1));
1953 out_ptr = sb_samples + j;
1959 imdct12(out2, ptr + 0);
1961 *out_ptr = MULH(out2[i], win[i]) + buf[i + 6*1];
1962 buf[i + 6*2] = MULH(out2[i + 6], win[i + 6]);
1965 imdct12(out2, ptr + 1);
1967 *out_ptr = MULH(out2[i], win[i]) + buf[i + 6*2];
1968 buf[i + 6*0] = MULH(out2[i + 6], win[i + 6]);
1971 imdct12(out2, ptr + 2);
1973 buf[i + 6*0] = MULH(out2[i], win[i]) + buf[i + 6*0];
1974 buf[i + 6*1] = MULH(out2[i + 6], win[i + 6]);
1981 for(j=sblimit;j<SBLIMIT;j++) {
1983 out_ptr = sb_samples + j;
1994 void sample_dump(int fnum, int32_t *tab, int n)
1996 static FILE *files[16], *f;
2003 snprintf(buf, sizeof(buf), "/tmp/out%d.%s.pcm",
2005 #ifdef USE_HIGHPRECISION
2011 f = fopen(buf, "w");
2019 av_log(NULL, AV_LOG_DEBUG, "pos=%d\n", pos);
2021 av_log(NULL, AV_LOG_DEBUG, " %0.4f", (double)tab[i] / FRAC_ONE);
2023 av_log(NULL, AV_LOG_DEBUG, "\n");
2028 /* normalize to 23 frac bits */
2029 v = tab[i] << (23 - FRAC_BITS);
2030 fwrite(&v, 1, sizeof(int32_t), f);
2036 /* main layer3 decoding function */
2037 static int mp_decode_layer3(MPADecodeContext *s)
2039 int nb_granules, main_data_begin, private_bits;
2040 int gr, ch, blocksplit_flag, i, j, k, n, bits_pos;
2041 GranuleDef granules[2][2], *g;
2042 int16_t exponents[576];
2044 /* read side info */
2046 main_data_begin = get_bits(&s->gb, 8);
2047 private_bits = get_bits(&s->gb, s->nb_channels);
2050 main_data_begin = get_bits(&s->gb, 9);
2051 if (s->nb_channels == 2)
2052 private_bits = get_bits(&s->gb, 3);
2054 private_bits = get_bits(&s->gb, 5);
2056 for(ch=0;ch<s->nb_channels;ch++) {
2057 granules[ch][0].scfsi = 0; /* all scale factors are transmitted */
2058 granules[ch][1].scfsi = get_bits(&s->gb, 4);
2062 for(gr=0;gr<nb_granules;gr++) {
2063 for(ch=0;ch<s->nb_channels;ch++) {
2064 dprintf(s->avctx, "gr=%d ch=%d: side_info\n", gr, ch);
2065 g = &granules[ch][gr];
2066 g->part2_3_length = get_bits(&s->gb, 12);
2067 g->big_values = get_bits(&s->gb, 9);
2068 if(g->big_values > 288){
2069 av_log(s->avctx, AV_LOG_ERROR, "big_values too big\n");
2073 g->global_gain = get_bits(&s->gb, 8);
2074 /* if MS stereo only is selected, we precompute the
2075 1/sqrt(2) renormalization factor */
2076 if ((s->mode_ext & (MODE_EXT_MS_STEREO | MODE_EXT_I_STEREO)) ==
2078 g->global_gain -= 2;
2080 g->scalefac_compress = get_bits(&s->gb, 9);
2082 g->scalefac_compress = get_bits(&s->gb, 4);
2083 blocksplit_flag = get_bits1(&s->gb);
2084 if (blocksplit_flag) {
2085 g->block_type = get_bits(&s->gb, 2);
2086 if (g->block_type == 0){
2087 av_log(s->avctx, AV_LOG_ERROR, "invalid block type\n");
2090 g->switch_point = get_bits1(&s->gb);
2092 g->table_select[i] = get_bits(&s->gb, 5);
2094 g->subblock_gain[i] = get_bits(&s->gb, 3);
2095 ff_init_short_region(s, g);
2097 int region_address1, region_address2;
2099 g->switch_point = 0;
2101 g->table_select[i] = get_bits(&s->gb, 5);
2102 /* compute huffman coded region sizes */
2103 region_address1 = get_bits(&s->gb, 4);
2104 region_address2 = get_bits(&s->gb, 3);
2105 dprintf(s->avctx, "region1=%d region2=%d\n",
2106 region_address1, region_address2);
2107 ff_init_long_region(s, g, region_address1, region_address2);
2109 ff_region_offset2size(g);
2110 ff_compute_band_indexes(s, g);
2114 g->preflag = get_bits1(&s->gb);
2115 g->scalefac_scale = get_bits1(&s->gb);
2116 g->count1table_select = get_bits1(&s->gb);
2117 dprintf(s->avctx, "block_type=%d switch_point=%d\n",
2118 g->block_type, g->switch_point);
2123 const uint8_t *ptr = s->gb.buffer + (get_bits_count(&s->gb)>>3);
2124 assert((get_bits_count(&s->gb) & 7) == 0);
2125 /* now we get bits from the main_data_begin offset */
2126 dprintf(s->avctx, "seekback: %d\n", main_data_begin);
2127 //av_log(NULL, AV_LOG_ERROR, "backstep:%d, lastbuf:%d\n", main_data_begin, s->last_buf_size);
2129 memcpy(s->last_buf + s->last_buf_size, ptr, EXTRABYTES);
2131 init_get_bits(&s->gb, s->last_buf, s->last_buf_size*8);
2132 skip_bits_long(&s->gb, 8*(s->last_buf_size - main_data_begin));
2135 for(gr=0;gr<nb_granules;gr++) {
2136 for(ch=0;ch<s->nb_channels;ch++) {
2137 g = &granules[ch][gr];
2138 if(get_bits_count(&s->gb)<0){
2139 av_log(s->avctx, AV_LOG_ERROR, "mdb:%d, lastbuf:%d skipping granule %d\n",
2140 main_data_begin, s->last_buf_size, gr);
2141 skip_bits_long(&s->gb, g->part2_3_length);
2142 memset(g->sb_hybrid, 0, sizeof(g->sb_hybrid));
2143 if(get_bits_count(&s->gb) >= s->gb.size_in_bits && s->in_gb.buffer){
2144 skip_bits_long(&s->in_gb, get_bits_count(&s->gb) - s->gb.size_in_bits);
2146 s->in_gb.buffer=NULL;
2151 bits_pos = get_bits_count(&s->gb);
2155 int slen, slen1, slen2;
2157 /* MPEG1 scale factors */
2158 slen1 = slen_table[0][g->scalefac_compress];
2159 slen2 = slen_table[1][g->scalefac_compress];
2160 dprintf(s->avctx, "slen1=%d slen2=%d\n", slen1, slen2);
2161 if (g->block_type == 2) {
2162 n = g->switch_point ? 17 : 18;
2166 g->scale_factors[j++] = get_bits(&s->gb, slen1);
2169 g->scale_factors[j++] = 0;
2173 g->scale_factors[j++] = get_bits(&s->gb, slen2);
2175 g->scale_factors[j++] = 0;
2178 g->scale_factors[j++] = 0;
2181 sc = granules[ch][0].scale_factors;
2184 n = (k == 0 ? 6 : 5);
2185 if ((g->scfsi & (0x8 >> k)) == 0) {
2186 slen = (k < 2) ? slen1 : slen2;
2189 g->scale_factors[j++] = get_bits(&s->gb, slen);
2192 g->scale_factors[j++] = 0;
2195 /* simply copy from last granule */
2197 g->scale_factors[j] = sc[j];
2202 g->scale_factors[j++] = 0;
2206 dprintf(s->avctx, "scfsi=%x gr=%d ch=%d scale_factors:\n",
2209 dprintf(s->avctx, " %d", g->scale_factors[i]);
2210 dprintf(s->avctx, "\n");
2214 int tindex, tindex2, slen[4], sl, sf;
2216 /* LSF scale factors */
2217 if (g->block_type == 2) {
2218 tindex = g->switch_point ? 2 : 1;
2222 sf = g->scalefac_compress;
2223 if ((s->mode_ext & MODE_EXT_I_STEREO) && ch == 1) {
2224 /* intensity stereo case */
2227 lsf_sf_expand(slen, sf, 6, 6, 0);
2229 } else if (sf < 244) {
2230 lsf_sf_expand(slen, sf - 180, 4, 4, 0);
2233 lsf_sf_expand(slen, sf - 244, 3, 0, 0);
2239 lsf_sf_expand(slen, sf, 5, 4, 4);
2241 } else if (sf < 500) {
2242 lsf_sf_expand(slen, sf - 400, 5, 4, 0);
2245 lsf_sf_expand(slen, sf - 500, 3, 0, 0);
2253 n = lsf_nsf_table[tindex2][tindex][k];
2257 g->scale_factors[j++] = get_bits(&s->gb, sl);
2260 g->scale_factors[j++] = 0;
2263 /* XXX: should compute exact size */
2265 g->scale_factors[j] = 0;
2268 dprintf(s->avctx, "gr=%d ch=%d scale_factors:\n",
2271 dprintf(s->avctx, " %d", g->scale_factors[i]);
2272 dprintf(s->avctx, "\n");
2277 exponents_from_scale_factors(s, g, exponents);
2279 /* read Huffman coded residue */
2280 huffman_decode(s, g, exponents, bits_pos + g->part2_3_length);
2282 sample_dump(0, g->sb_hybrid, 576);
2286 if (s->nb_channels == 2)
2287 compute_stereo(s, &granules[0][gr], &granules[1][gr]);
2289 for(ch=0;ch<s->nb_channels;ch++) {
2290 g = &granules[ch][gr];
2292 reorder_block(s, g);
2294 sample_dump(0, g->sb_hybrid, 576);
2296 s->compute_antialias(s, g);
2298 sample_dump(1, g->sb_hybrid, 576);
2300 compute_imdct(s, g, &s->sb_samples[ch][18 * gr][0], s->mdct_buf[ch]);
2302 sample_dump(2, &s->sb_samples[ch][18 * gr][0], 576);
2306 if(get_bits_count(&s->gb)<0)
2307 skip_bits_long(&s->gb, -get_bits_count(&s->gb));
2308 return nb_granules * 18;
2311 static int mp_decode_frame(MPADecodeContext *s,
2312 OUT_INT *samples, const uint8_t *buf, int buf_size)
2314 int i, nb_frames, ch;
2315 OUT_INT *samples_ptr;
2317 init_get_bits(&s->gb, buf + HEADER_SIZE, (buf_size - HEADER_SIZE)*8);
2319 /* skip error protection field */
2320 if (s->error_protection)
2321 skip_bits(&s->gb, 16);
2323 dprintf(s->avctx, "frame %d:\n", s->frame_count);
2326 s->avctx->frame_size = 384;
2327 nb_frames = mp_decode_layer1(s);
2330 s->avctx->frame_size = 1152;
2331 nb_frames = mp_decode_layer2(s);
2334 s->avctx->frame_size = s->lsf ? 576 : 1152;
2336 nb_frames = mp_decode_layer3(s);
2339 if(s->in_gb.buffer){
2340 align_get_bits(&s->gb);
2341 i= (s->gb.size_in_bits - get_bits_count(&s->gb))>>3;
2342 if(i >= 0 && i <= BACKSTEP_SIZE){
2343 memmove(s->last_buf, s->gb.buffer + (get_bits_count(&s->gb)>>3), i);
2346 av_log(s->avctx, AV_LOG_ERROR, "invalid old backstep %d\n", i);
2348 s->in_gb.buffer= NULL;
2351 align_get_bits(&s->gb);
2352 assert((get_bits_count(&s->gb) & 7) == 0);
2353 i= (s->gb.size_in_bits - get_bits_count(&s->gb))>>3;
2355 if(i<0 || i > BACKSTEP_SIZE || nb_frames<0){
2356 av_log(s->avctx, AV_LOG_WARNING, "invalid new backstep %d\n", i);
2357 i= FFMIN(BACKSTEP_SIZE, buf_size - HEADER_SIZE);
2359 assert(i <= buf_size - HEADER_SIZE && i>= 0);
2360 memcpy(s->last_buf + s->last_buf_size, s->gb.buffer + buf_size - HEADER_SIZE - i, i);
2361 s->last_buf_size += i;
2366 for(i=0;i<nb_frames;i++) {
2367 for(ch=0;ch<s->nb_channels;ch++) {
2369 dprintf(s->avctx, "%d-%d:", i, ch);
2370 for(j=0;j<SBLIMIT;j++)
2371 dprintf(s->avctx, " %0.6f", (double)s->sb_samples[ch][i][j] / FRAC_ONE);
2372 dprintf(s->avctx, "\n");
2376 /* apply the synthesis filter */
2377 for(ch=0;ch<s->nb_channels;ch++) {
2378 samples_ptr = samples + ch;
2379 for(i=0;i<nb_frames;i++) {
2380 ff_mpa_synth_filter(s->synth_buf[ch], &(s->synth_buf_offset[ch]),
2381 window, &s->dither_state,
2382 samples_ptr, s->nb_channels,
2383 s->sb_samples[ch][i]);
2384 samples_ptr += 32 * s->nb_channels;
2390 return nb_frames * 32 * sizeof(OUT_INT) * s->nb_channels;
2393 static int decode_frame(AVCodecContext * avctx,
2394 void *data, int *data_size,
2395 const uint8_t * buf, int buf_size)
2397 MPADecodeContext *s = avctx->priv_data;
2400 OUT_INT *out_samples = data;
2403 if(buf_size < HEADER_SIZE)
2406 header = AV_RB32(buf);
2407 if(ff_mpa_check_header(header) < 0){
2410 av_log(avctx, AV_LOG_ERROR, "Header missing skipping one byte.\n");
2414 if (ff_mpegaudio_decode_header(s, header) == 1) {
2415 /* free format: prepare to compute frame size */
2419 /* update codec info */
2420 avctx->channels = s->nb_channels;
2421 avctx->bit_rate = s->bit_rate;
2422 avctx->sub_id = s->layer;
2424 if(s->frame_size<=0 || s->frame_size > buf_size){
2425 av_log(avctx, AV_LOG_ERROR, "incomplete frame\n");
2427 }else if(s->frame_size < buf_size){
2428 av_log(avctx, AV_LOG_ERROR, "incorrect frame size\n");
2429 buf_size= s->frame_size;
2432 out_size = mp_decode_frame(s, out_samples, buf, buf_size);
2434 *data_size = out_size;
2435 avctx->sample_rate = s->sample_rate;
2436 //FIXME maybe move the other codec info stuff from above here too
2438 av_log(avctx, AV_LOG_DEBUG, "Error while decoding MPEG audio frame.\n"); //FIXME return -1 / but also return the number of bytes consumed
2443 static void flush(AVCodecContext *avctx){
2444 MPADecodeContext *s = avctx->priv_data;
2445 memset(s->synth_buf, 0, sizeof(s->synth_buf));
2446 s->last_buf_size= 0;
2449 #ifdef CONFIG_MP3ADU_DECODER
2450 static int decode_frame_adu(AVCodecContext * avctx,
2451 void *data, int *data_size,
2452 const uint8_t * buf, int buf_size)
2454 MPADecodeContext *s = avctx->priv_data;
2457 OUT_INT *out_samples = data;
2461 // Discard too short frames
2462 if (buf_size < HEADER_SIZE) {
2468 if (len > MPA_MAX_CODED_FRAME_SIZE)
2469 len = MPA_MAX_CODED_FRAME_SIZE;
2471 // Get header and restore sync word
2472 header = AV_RB32(buf) | 0xffe00000;
2474 if (ff_mpa_check_header(header) < 0) { // Bad header, discard frame
2479 ff_mpegaudio_decode_header(s, header);
2480 /* update codec info */
2481 avctx->sample_rate = s->sample_rate;
2482 avctx->channels = s->nb_channels;
2483 avctx->bit_rate = s->bit_rate;
2484 avctx->sub_id = s->layer;
2486 s->frame_size = len;
2488 if (avctx->parse_only) {
2489 out_size = buf_size;
2491 out_size = mp_decode_frame(s, out_samples, buf, buf_size);
2494 *data_size = out_size;
2497 #endif /* CONFIG_MP3ADU_DECODER */
2499 #ifdef CONFIG_MP3ON4_DECODER
2502 * Context for MP3On4 decoder
2504 typedef struct MP3On4DecodeContext {
2505 int frames; ///< number of mp3 frames per block (number of mp3 decoder instances)
2506 int syncword; ///< syncword patch
2507 const uint8_t *coff; ///< channels offsets in output buffer
2508 MPADecodeContext *mp3decctx[5]; ///< MPADecodeContext for every decoder instance
2509 } MP3On4DecodeContext;
2511 #include "mpeg4audio.h"
2513 /* Next 3 arrays are indexed by channel config number (passed via codecdata) */
2514 static const uint8_t mp3Frames[8] = {0,1,1,2,3,3,4,5}; /* number of mp3 decoder instances */
2515 /* offsets into output buffer, assume output order is FL FR BL BR C LFE */
2516 static const uint8_t chan_offset[8][5] = {
2521 {2,0,3}, // C FLR BS
2522 {4,0,2}, // C FLR BLRS
2523 {4,0,2,5}, // C FLR BLRS LFE
2524 {4,0,2,6,5}, // C FLR BLRS BLR LFE
2528 static int decode_init_mp3on4(AVCodecContext * avctx)
2530 MP3On4DecodeContext *s = avctx->priv_data;
2531 MPEG4AudioConfig cfg;
2534 if ((avctx->extradata_size < 2) || (avctx->extradata == NULL)) {
2535 av_log(avctx, AV_LOG_ERROR, "Codec extradata missing or too short.\n");
2539 ff_mpeg4audio_get_config(&cfg, avctx->extradata, avctx->extradata_size);
2540 if (!cfg.chan_config || cfg.chan_config > 7) {
2541 av_log(avctx, AV_LOG_ERROR, "Invalid channel config number.\n");
2544 s->frames = mp3Frames[cfg.chan_config];
2545 s->coff = chan_offset[cfg.chan_config];
2546 avctx->channels = ff_mpeg4audio_channels[cfg.chan_config];
2548 if (cfg.sample_rate < 16000)
2549 s->syncword = 0xffe00000;
2551 s->syncword = 0xfff00000;
2553 /* Init the first mp3 decoder in standard way, so that all tables get builded
2554 * We replace avctx->priv_data with the context of the first decoder so that
2555 * decode_init() does not have to be changed.
2556 * Other decoders will be initialized here copying data from the first context
2558 // Allocate zeroed memory for the first decoder context
2559 s->mp3decctx[0] = av_mallocz(sizeof(MPADecodeContext));
2560 // Put decoder context in place to make init_decode() happy
2561 avctx->priv_data = s->mp3decctx[0];
2563 // Restore mp3on4 context pointer
2564 avctx->priv_data = s;
2565 s->mp3decctx[0]->adu_mode = 1; // Set adu mode
2567 /* Create a separate codec/context for each frame (first is already ok).
2568 * Each frame is 1 or 2 channels - up to 5 frames allowed
2570 for (i = 1; i < s->frames; i++) {
2571 s->mp3decctx[i] = av_mallocz(sizeof(MPADecodeContext));
2572 s->mp3decctx[i]->compute_antialias = s->mp3decctx[0]->compute_antialias;
2573 s->mp3decctx[i]->adu_mode = 1;
2574 s->mp3decctx[i]->avctx = avctx;
2581 static int decode_close_mp3on4(AVCodecContext * avctx)
2583 MP3On4DecodeContext *s = avctx->priv_data;
2586 for (i = 0; i < s->frames; i++)
2587 if (s->mp3decctx[i])
2588 av_free(s->mp3decctx[i]);
2594 static int decode_frame_mp3on4(AVCodecContext * avctx,
2595 void *data, int *data_size,
2596 const uint8_t * buf, int buf_size)
2598 MP3On4DecodeContext *s = avctx->priv_data;
2599 MPADecodeContext *m;
2600 int fsize, len = buf_size, out_size = 0;
2602 OUT_INT *out_samples = data;
2603 OUT_INT decoded_buf[MPA_FRAME_SIZE * MPA_MAX_CHANNELS];
2604 OUT_INT *outptr, *bp;
2608 // Discard too short frames
2609 if (buf_size < HEADER_SIZE)
2612 // If only one decoder interleave is not needed
2613 outptr = s->frames == 1 ? out_samples : decoded_buf;
2615 avctx->bit_rate = 0;
2617 for (fr = 0; fr < s->frames; fr++) {
2618 fsize = AV_RB16(buf) >> 4;
2619 fsize = FFMIN3(fsize, len, MPA_MAX_CODED_FRAME_SIZE);
2620 m = s->mp3decctx[fr];
2623 header = (AV_RB32(buf) & 0x000fffff) | s->syncword; // patch header
2625 if (ff_mpa_check_header(header) < 0) // Bad header, discard block
2628 ff_mpegaudio_decode_header(m, header);
2629 out_size += mp_decode_frame(m, outptr, buf, fsize);
2634 n = m->avctx->frame_size*m->nb_channels;
2635 /* interleave output data */
2636 bp = out_samples + s->coff[fr];
2637 if(m->nb_channels == 1) {
2638 for(j = 0; j < n; j++) {
2639 *bp = decoded_buf[j];
2640 bp += avctx->channels;
2643 for(j = 0; j < n; j++) {
2644 bp[0] = decoded_buf[j++];
2645 bp[1] = decoded_buf[j];
2646 bp += avctx->channels;
2650 avctx->bit_rate += m->bit_rate;
2653 /* update codec info */
2654 avctx->sample_rate = s->mp3decctx[0]->sample_rate;
2656 *data_size = out_size;
2659 #endif /* CONFIG_MP3ON4_DECODER */
2661 #ifdef CONFIG_MP2_DECODER
2662 AVCodec mp2_decoder =
2667 sizeof(MPADecodeContext),
2672 CODEC_CAP_PARSE_ONLY,
2674 .long_name= NULL_IF_CONFIG_SMALL("MP2 (MPEG audio layer 2)"),
2677 #ifdef CONFIG_MP3_DECODER
2678 AVCodec mp3_decoder =
2683 sizeof(MPADecodeContext),
2688 CODEC_CAP_PARSE_ONLY,
2690 .long_name= NULL_IF_CONFIG_SMALL("MP3 (MPEG audio layer 3)"),
2693 #ifdef CONFIG_MP3ADU_DECODER
2694 AVCodec mp3adu_decoder =
2699 sizeof(MPADecodeContext),
2704 CODEC_CAP_PARSE_ONLY,
2706 .long_name= NULL_IF_CONFIG_SMALL("ADU (Application Data Unit) MP3 (MPEG audio layer 3)"),
2709 #ifdef CONFIG_MP3ON4_DECODER
2710 AVCodec mp3on4_decoder =
2715 sizeof(MP3On4DecodeContext),
2718 decode_close_mp3on4,
2719 decode_frame_mp3on4,
2721 .long_name= NULL_IF_CONFIG_SMALL("MP3onMP4"),