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
33 * - in low precision mode, use more 16 bit multiplies in synth filter
34 * - test lsf / mpeg25 extensively.
37 #include "mpegaudio.h"
38 #include "mpegaudiodecheader.h"
43 # define SHR(a,b) ((a)*(1.0f/(1<<(b))))
44 # define compute_antialias compute_antialias_float
45 # define FIXR_OLD(a) ((int)((a) * FRAC_ONE + 0.5))
46 # define FIXR(x) ((float)(x))
47 # define FIXHR(x) ((float)(x))
48 # define MULH3(x, y, s) ((s)*(y)*(x))
49 # define MULLx(x, y, s) ((y)*(x))
50 # define RENAME(a) a ## _float
52 # define SHR(a,b) ((a)>>(b))
53 # define compute_antialias compute_antialias_integer
54 /* WARNING: only correct for posititive numbers */
55 # define FIXR_OLD(a) ((int)((a) * FRAC_ONE + 0.5))
56 # define FIXR(a) ((int)((a) * FRAC_ONE + 0.5))
57 # define FIXHR(a) ((int)((a) * (1LL<<32) + 0.5))
58 # define MULH3(x, y, s) MULH((s)*(x), y)
59 # define MULLx(x, y, s) MULL(x,y,s)
67 #include "mpegaudiodata.h"
68 #include "mpegaudiodectab.h"
70 static void compute_antialias_integer(MPADecodeContext *s, GranuleDef *g);
71 static void compute_antialias_float(MPADecodeContext *s, GranuleDef *g);
73 /* vlc structure for decoding layer 3 huffman tables */
74 static VLC huff_vlc[16];
75 static VLC_TYPE huff_vlc_tables[
76 0+128+128+128+130+128+154+166+
77 142+204+190+170+542+460+662+414
79 static const int huff_vlc_tables_sizes[16] = {
80 0, 128, 128, 128, 130, 128, 154, 166,
81 142, 204, 190, 170, 542, 460, 662, 414
83 static VLC huff_quad_vlc[2];
84 static VLC_TYPE huff_quad_vlc_tables[128+16][2];
85 static const int huff_quad_vlc_tables_sizes[2] = {
88 /* computed from band_size_long */
89 static uint16_t band_index_long[9][23];
90 #include "mpegaudio_tablegen.h"
91 /* intensity stereo coef table */
92 static INTFLOAT is_table[2][16];
93 static INTFLOAT is_table_lsf[2][2][16];
94 static int32_t csa_table[8][4];
95 static float csa_table_float[8][4];
96 static INTFLOAT mdct_win[8][36];
98 /* lower 2 bits: modulo 3, higher bits: shift */
99 static uint16_t scale_factor_modshift[64];
100 /* [i][j]: 2^(-j/3) * FRAC_ONE * 2^(i+2) / (2^(i+2) - 1) */
101 static int32_t scale_factor_mult[15][3];
102 /* mult table for layer 2 group quantization */
104 #define SCALE_GEN(v) \
105 { FIXR_OLD(1.0 * (v)), FIXR_OLD(0.7937005259 * (v)), FIXR_OLD(0.6299605249 * (v)) }
107 static const int32_t scale_factor_mult2[3][3] = {
108 SCALE_GEN(4.0 / 3.0), /* 3 steps */
109 SCALE_GEN(4.0 / 5.0), /* 5 steps */
110 SCALE_GEN(4.0 / 9.0), /* 9 steps */
113 DECLARE_ALIGNED(16, MPA_INT, RENAME(ff_mpa_synth_window))[512];
116 * Convert region offsets to region sizes and truncate
117 * size to big_values.
119 static void ff_region_offset2size(GranuleDef *g){
121 g->region_size[2] = (576 / 2);
123 k = FFMIN(g->region_size[i], g->big_values);
124 g->region_size[i] = k - j;
129 static void ff_init_short_region(MPADecodeContext *s, GranuleDef *g){
130 if (g->block_type == 2)
131 g->region_size[0] = (36 / 2);
133 if (s->sample_rate_index <= 2)
134 g->region_size[0] = (36 / 2);
135 else if (s->sample_rate_index != 8)
136 g->region_size[0] = (54 / 2);
138 g->region_size[0] = (108 / 2);
140 g->region_size[1] = (576 / 2);
143 static void ff_init_long_region(MPADecodeContext *s, GranuleDef *g, int ra1, int ra2){
146 band_index_long[s->sample_rate_index][ra1 + 1] >> 1;
147 /* should not overflow */
148 l = FFMIN(ra1 + ra2 + 2, 22);
150 band_index_long[s->sample_rate_index][l] >> 1;
153 static void ff_compute_band_indexes(MPADecodeContext *s, GranuleDef *g){
154 if (g->block_type == 2) {
155 if (g->switch_point) {
156 /* if switched mode, we handle the 36 first samples as
157 long blocks. For 8000Hz, we handle the 48 first
158 exponents as long blocks (XXX: check this!) */
159 if (s->sample_rate_index <= 2)
161 else if (s->sample_rate_index != 8)
164 g->long_end = 4; /* 8000 Hz */
166 g->short_start = 2 + (s->sample_rate_index != 8);
177 /* layer 1 unscaling */
178 /* n = number of bits of the mantissa minus 1 */
179 static inline int l1_unscale(int n, int mant, int scale_factor)
184 shift = scale_factor_modshift[scale_factor];
187 val = MUL64(mant + (-1 << n) + 1, scale_factor_mult[n-1][mod]);
189 /* NOTE: at this point, 1 <= shift >= 21 + 15 */
190 return (int)((val + (1LL << (shift - 1))) >> shift);
193 static inline int l2_unscale_group(int steps, int mant, int scale_factor)
197 shift = scale_factor_modshift[scale_factor];
201 val = (mant - (steps >> 1)) * scale_factor_mult2[steps >> 2][mod];
202 /* NOTE: at this point, 0 <= shift <= 21 */
204 val = (val + (1 << (shift - 1))) >> shift;
208 /* compute value^(4/3) * 2^(exponent/4). It normalized to FRAC_BITS */
209 static inline int l3_unscale(int value, int exponent)
214 e = table_4_3_exp [4*value + (exponent&3)];
215 m = table_4_3_value[4*value + (exponent&3)];
216 e -= (exponent >> 2);
220 m = (m + (1 << (e-1))) >> e;
225 /* all integer n^(4/3) computation code */
228 #define POW_FRAC_BITS 24
229 #define POW_FRAC_ONE (1 << POW_FRAC_BITS)
230 #define POW_FIX(a) ((int)((a) * POW_FRAC_ONE))
231 #define POW_MULL(a,b) (((int64_t)(a) * (int64_t)(b)) >> POW_FRAC_BITS)
233 static int dev_4_3_coefs[DEV_ORDER];
236 static int pow_mult3[3] = {
238 POW_FIX(1.25992104989487316476),
239 POW_FIX(1.58740105196819947474),
243 static av_cold void int_pow_init(void)
248 for(i=0;i<DEV_ORDER;i++) {
249 a = POW_MULL(a, POW_FIX(4.0 / 3.0) - i * POW_FIX(1.0)) / (i + 1);
250 dev_4_3_coefs[i] = a;
254 #if 0 /* unused, remove? */
255 /* return the mantissa and the binary exponent */
256 static int int_pow(int i, int *exp_ptr)
264 while (a < (1 << (POW_FRAC_BITS - 1))) {
268 a -= (1 << POW_FRAC_BITS);
270 for(j = DEV_ORDER - 1; j >= 0; j--)
271 a1 = POW_MULL(a, dev_4_3_coefs[j] + a1);
272 a = (1 << POW_FRAC_BITS) + a1;
273 /* exponent compute (exact) */
277 a = POW_MULL(a, pow_mult3[er]);
278 while (a >= 2 * POW_FRAC_ONE) {
282 /* convert to float */
283 while (a < POW_FRAC_ONE) {
287 /* now POW_FRAC_ONE <= a < 2 * POW_FRAC_ONE */
288 #if POW_FRAC_BITS > FRAC_BITS
289 a = (a + (1 << (POW_FRAC_BITS - FRAC_BITS - 1))) >> (POW_FRAC_BITS - FRAC_BITS);
290 /* correct overflow */
291 if (a >= 2 * (1 << FRAC_BITS)) {
301 static av_cold int decode_init(AVCodecContext * avctx)
303 MPADecodeContext *s = avctx->priv_data;
309 avctx->sample_fmt= OUT_FMT;
310 s->error_recognition= avctx->error_recognition;
312 if (!init && !avctx->parse_only) {
315 /* scale factors table for layer 1/2 */
318 /* 1.0 (i = 3) is normalized to 2 ^ FRAC_BITS */
321 scale_factor_modshift[i] = mod | (shift << 2);
324 /* scale factor multiply for layer 1 */
328 norm = ((INT64_C(1) << n) * FRAC_ONE) / ((1 << n) - 1);
329 scale_factor_mult[i][0] = MULLx(norm, FIXR(1.0 * 2.0), FRAC_BITS);
330 scale_factor_mult[i][1] = MULLx(norm, FIXR(0.7937005259 * 2.0), FRAC_BITS);
331 scale_factor_mult[i][2] = MULLx(norm, FIXR(0.6299605249 * 2.0), FRAC_BITS);
332 dprintf(avctx, "%d: norm=%x s=%x %x %x\n",
334 scale_factor_mult[i][0],
335 scale_factor_mult[i][1],
336 scale_factor_mult[i][2]);
339 RENAME(ff_mpa_synth_init)(RENAME(ff_mpa_synth_window));
341 /* huffman decode tables */
344 const HuffTable *h = &mpa_huff_tables[i];
346 uint8_t tmp_bits [512];
347 uint16_t tmp_codes[512];
349 memset(tmp_bits , 0, sizeof(tmp_bits ));
350 memset(tmp_codes, 0, sizeof(tmp_codes));
355 for(x=0;x<xsize;x++) {
356 for(y=0;y<xsize;y++){
357 tmp_bits [(x << 5) | y | ((x&&y)<<4)]= h->bits [j ];
358 tmp_codes[(x << 5) | y | ((x&&y)<<4)]= h->codes[j++];
363 huff_vlc[i].table = huff_vlc_tables+offset;
364 huff_vlc[i].table_allocated = huff_vlc_tables_sizes[i];
365 init_vlc(&huff_vlc[i], 7, 512,
366 tmp_bits, 1, 1, tmp_codes, 2, 2,
367 INIT_VLC_USE_NEW_STATIC);
368 offset += huff_vlc_tables_sizes[i];
370 assert(offset == FF_ARRAY_ELEMS(huff_vlc_tables));
374 huff_quad_vlc[i].table = huff_quad_vlc_tables+offset;
375 huff_quad_vlc[i].table_allocated = huff_quad_vlc_tables_sizes[i];
376 init_vlc(&huff_quad_vlc[i], i == 0 ? 7 : 4, 16,
377 mpa_quad_bits[i], 1, 1, mpa_quad_codes[i], 1, 1,
378 INIT_VLC_USE_NEW_STATIC);
379 offset += huff_quad_vlc_tables_sizes[i];
381 assert(offset == FF_ARRAY_ELEMS(huff_quad_vlc_tables));
386 band_index_long[i][j] = k;
387 k += band_size_long[i][j];
389 band_index_long[i][22] = k;
392 /* compute n ^ (4/3) and store it in mantissa/exp format */
395 mpegaudio_tableinit();
401 f = tan((double)i * M_PI / 12.0);
402 v = FIXR(f / (1.0 + f));
407 is_table[1][6 - i] = v;
411 is_table[0][i] = is_table[1][i] = 0.0;
418 e = -(j + 1) * ((i + 1) >> 1);
419 f = pow(2.0, e / 4.0);
421 is_table_lsf[j][k ^ 1][i] = FIXR(f);
422 is_table_lsf[j][k][i] = FIXR(1.0);
423 dprintf(avctx, "is_table_lsf %d %d: %x %x\n",
424 i, j, is_table_lsf[j][0][i], is_table_lsf[j][1][i]);
431 cs = 1.0 / sqrt(1.0 + ci * ci);
433 csa_table[i][0] = FIXHR(cs/4);
434 csa_table[i][1] = FIXHR(ca/4);
435 csa_table[i][2] = FIXHR(ca/4) + FIXHR(cs/4);
436 csa_table[i][3] = FIXHR(ca/4) - FIXHR(cs/4);
437 csa_table_float[i][0] = cs;
438 csa_table_float[i][1] = ca;
439 csa_table_float[i][2] = ca + cs;
440 csa_table_float[i][3] = ca - cs;
443 /* compute mdct windows */
451 d= sin(M_PI * (i + 0.5) / 36.0);
454 else if(i>=24) d= sin(M_PI * (i - 18 + 0.5) / 12.0);
458 else if(i< 12) d= sin(M_PI * (i - 6 + 0.5) / 12.0);
461 //merge last stage of imdct into the window coefficients
462 d*= 0.5 / cos(M_PI*(2*i + 19)/72);
465 mdct_win[j][i/3] = FIXHR((d / (1<<5)));
467 mdct_win[j][i ] = FIXHR((d / (1<<5)));
471 /* NOTE: we do frequency inversion adter the MDCT by changing
472 the sign of the right window coefs */
475 mdct_win[j + 4][i] = mdct_win[j][i];
476 mdct_win[j + 4][i + 1] = -mdct_win[j][i + 1];
483 if (avctx->codec_id == CODEC_ID_MP3ADU)
488 /* tab[i][j] = 1.0 / (2.0 * cos(pi*(2*k+1) / 2^(6 - j))) */
492 #define COS0_0 FIXHR(0.50060299823519630134/2)
493 #define COS0_1 FIXHR(0.50547095989754365998/2)
494 #define COS0_2 FIXHR(0.51544730992262454697/2)
495 #define COS0_3 FIXHR(0.53104259108978417447/2)
496 #define COS0_4 FIXHR(0.55310389603444452782/2)
497 #define COS0_5 FIXHR(0.58293496820613387367/2)
498 #define COS0_6 FIXHR(0.62250412303566481615/2)
499 #define COS0_7 FIXHR(0.67480834145500574602/2)
500 #define COS0_8 FIXHR(0.74453627100229844977/2)
501 #define COS0_9 FIXHR(0.83934964541552703873/2)
502 #define COS0_10 FIXHR(0.97256823786196069369/2)
503 #define COS0_11 FIXHR(1.16943993343288495515/4)
504 #define COS0_12 FIXHR(1.48416461631416627724/4)
505 #define COS0_13 FIXHR(2.05778100995341155085/8)
506 #define COS0_14 FIXHR(3.40760841846871878570/8)
507 #define COS0_15 FIXHR(10.19000812354805681150/32)
509 #define COS1_0 FIXHR(0.50241928618815570551/2)
510 #define COS1_1 FIXHR(0.52249861493968888062/2)
511 #define COS1_2 FIXHR(0.56694403481635770368/2)
512 #define COS1_3 FIXHR(0.64682178335999012954/2)
513 #define COS1_4 FIXHR(0.78815462345125022473/2)
514 #define COS1_5 FIXHR(1.06067768599034747134/4)
515 #define COS1_6 FIXHR(1.72244709823833392782/4)
516 #define COS1_7 FIXHR(5.10114861868916385802/16)
518 #define COS2_0 FIXHR(0.50979557910415916894/2)
519 #define COS2_1 FIXHR(0.60134488693504528054/2)
520 #define COS2_2 FIXHR(0.89997622313641570463/2)
521 #define COS2_3 FIXHR(2.56291544774150617881/8)
523 #define COS3_0 FIXHR(0.54119610014619698439/2)
524 #define COS3_1 FIXHR(1.30656296487637652785/4)
526 #define COS4_0 FIXHR(0.70710678118654752439/2)
528 /* butterfly operator */
529 #define BF(a, b, c, s)\
531 tmp0 = tab[a] + tab[b];\
532 tmp1 = tab[a] - tab[b];\
534 tab[b] = MULH3(tmp1, c, 1<<(s));\
537 #define BF1(a, b, c, d)\
539 BF(a, b, COS4_0, 1);\
540 BF(c, d,-COS4_0, 1);\
544 #define BF2(a, b, c, d)\
546 BF(a, b, COS4_0, 1);\
547 BF(c, d,-COS4_0, 1);\
554 #define ADD(a, b) tab[a] += tab[b]
556 /* DCT32 without 1/sqrt(2) coef zero scaling. */
557 static void dct32(INTFLOAT *out, INTFLOAT *tab)
562 BF( 0, 31, COS0_0 , 1);
563 BF(15, 16, COS0_15, 5);
565 BF( 0, 15, COS1_0 , 1);
566 BF(16, 31,-COS1_0 , 1);
568 BF( 7, 24, COS0_7 , 1);
569 BF( 8, 23, COS0_8 , 1);
571 BF( 7, 8, COS1_7 , 4);
572 BF(23, 24,-COS1_7 , 4);
574 BF( 0, 7, COS2_0 , 1);
575 BF( 8, 15,-COS2_0 , 1);
576 BF(16, 23, COS2_0 , 1);
577 BF(24, 31,-COS2_0 , 1);
579 BF( 3, 28, COS0_3 , 1);
580 BF(12, 19, COS0_12, 2);
582 BF( 3, 12, COS1_3 , 1);
583 BF(19, 28,-COS1_3 , 1);
585 BF( 4, 27, COS0_4 , 1);
586 BF(11, 20, COS0_11, 2);
588 BF( 4, 11, COS1_4 , 1);
589 BF(20, 27,-COS1_4 , 1);
591 BF( 3, 4, COS2_3 , 3);
592 BF(11, 12,-COS2_3 , 3);
593 BF(19, 20, COS2_3 , 3);
594 BF(27, 28,-COS2_3 , 3);
596 BF( 0, 3, COS3_0 , 1);
597 BF( 4, 7,-COS3_0 , 1);
598 BF( 8, 11, COS3_0 , 1);
599 BF(12, 15,-COS3_0 , 1);
600 BF(16, 19, COS3_0 , 1);
601 BF(20, 23,-COS3_0 , 1);
602 BF(24, 27, COS3_0 , 1);
603 BF(28, 31,-COS3_0 , 1);
608 BF( 1, 30, COS0_1 , 1);
609 BF(14, 17, COS0_14, 3);
611 BF( 1, 14, COS1_1 , 1);
612 BF(17, 30,-COS1_1 , 1);
614 BF( 6, 25, COS0_6 , 1);
615 BF( 9, 22, COS0_9 , 1);
617 BF( 6, 9, COS1_6 , 2);
618 BF(22, 25,-COS1_6 , 2);
620 BF( 1, 6, COS2_1 , 1);
621 BF( 9, 14,-COS2_1 , 1);
622 BF(17, 22, COS2_1 , 1);
623 BF(25, 30,-COS2_1 , 1);
626 BF( 2, 29, COS0_2 , 1);
627 BF(13, 18, COS0_13, 3);
629 BF( 2, 13, COS1_2 , 1);
630 BF(18, 29,-COS1_2 , 1);
632 BF( 5, 26, COS0_5 , 1);
633 BF(10, 21, COS0_10, 1);
635 BF( 5, 10, COS1_5 , 2);
636 BF(21, 26,-COS1_5 , 2);
638 BF( 2, 5, COS2_2 , 1);
639 BF(10, 13,-COS2_2 , 1);
640 BF(18, 21, COS2_2 , 1);
641 BF(26, 29,-COS2_2 , 1);
643 BF( 1, 2, COS3_1 , 2);
644 BF( 5, 6,-COS3_1 , 2);
645 BF( 9, 10, COS3_1 , 2);
646 BF(13, 14,-COS3_1 , 2);
647 BF(17, 18, COS3_1 , 2);
648 BF(21, 22,-COS3_1 , 2);
649 BF(25, 26, COS3_1 , 2);
650 BF(29, 30,-COS3_1 , 2);
697 out[ 1] = tab[16] + tab[24];
698 out[17] = tab[17] + tab[25];
699 out[ 9] = tab[18] + tab[26];
700 out[25] = tab[19] + tab[27];
701 out[ 5] = tab[20] + tab[28];
702 out[21] = tab[21] + tab[29];
703 out[13] = tab[22] + tab[30];
704 out[29] = tab[23] + tab[31];
705 out[ 3] = tab[24] + tab[20];
706 out[19] = tab[25] + tab[21];
707 out[11] = tab[26] + tab[22];
708 out[27] = tab[27] + tab[23];
709 out[ 7] = tab[28] + tab[18];
710 out[23] = tab[29] + tab[19];
711 out[15] = tab[30] + tab[17];
716 static inline float round_sample(float *sum)
723 /* signed 16x16 -> 32 multiply add accumulate */
724 #define MACS(rt, ra, rb) rt+=(ra)*(rb)
726 /* signed 16x16 -> 32 multiply */
727 #define MULS(ra, rb) ((ra)*(rb))
729 #define MLSS(rt, ra, rb) rt-=(ra)*(rb)
731 #elif FRAC_BITS <= 15
733 static inline int round_sample(int *sum)
736 sum1 = (*sum) >> OUT_SHIFT;
737 *sum &= (1<<OUT_SHIFT)-1;
738 return av_clip(sum1, OUT_MIN, OUT_MAX);
741 /* signed 16x16 -> 32 multiply add accumulate */
742 #define MACS(rt, ra, rb) MAC16(rt, ra, rb)
744 /* signed 16x16 -> 32 multiply */
745 #define MULS(ra, rb) MUL16(ra, rb)
747 #define MLSS(rt, ra, rb) MLS16(rt, ra, rb)
751 static inline int round_sample(int64_t *sum)
754 sum1 = (int)((*sum) >> OUT_SHIFT);
755 *sum &= (1<<OUT_SHIFT)-1;
756 return av_clip(sum1, OUT_MIN, OUT_MAX);
759 # define MULS(ra, rb) MUL64(ra, rb)
760 # define MACS(rt, ra, rb) MAC64(rt, ra, rb)
761 # define MLSS(rt, ra, rb) MLS64(rt, ra, rb)
764 #define SUM8(op, sum, w, p) \
766 op(sum, (w)[0 * 64], (p)[0 * 64]); \
767 op(sum, (w)[1 * 64], (p)[1 * 64]); \
768 op(sum, (w)[2 * 64], (p)[2 * 64]); \
769 op(sum, (w)[3 * 64], (p)[3 * 64]); \
770 op(sum, (w)[4 * 64], (p)[4 * 64]); \
771 op(sum, (w)[5 * 64], (p)[5 * 64]); \
772 op(sum, (w)[6 * 64], (p)[6 * 64]); \
773 op(sum, (w)[7 * 64], (p)[7 * 64]); \
776 #define SUM8P2(sum1, op1, sum2, op2, w1, w2, p) \
780 op1(sum1, (w1)[0 * 64], tmp);\
781 op2(sum2, (w2)[0 * 64], tmp);\
783 op1(sum1, (w1)[1 * 64], tmp);\
784 op2(sum2, (w2)[1 * 64], tmp);\
786 op1(sum1, (w1)[2 * 64], tmp);\
787 op2(sum2, (w2)[2 * 64], tmp);\
789 op1(sum1, (w1)[3 * 64], tmp);\
790 op2(sum2, (w2)[3 * 64], tmp);\
792 op1(sum1, (w1)[4 * 64], tmp);\
793 op2(sum2, (w2)[4 * 64], tmp);\
795 op1(sum1, (w1)[5 * 64], tmp);\
796 op2(sum2, (w2)[5 * 64], tmp);\
798 op1(sum1, (w1)[6 * 64], tmp);\
799 op2(sum2, (w2)[6 * 64], tmp);\
801 op1(sum1, (w1)[7 * 64], tmp);\
802 op2(sum2, (w2)[7 * 64], tmp);\
805 void av_cold RENAME(ff_mpa_synth_init)(MPA_INT *window)
809 /* max = 18760, max sum over all 16 coefs : 44736 */
812 v = ff_mpa_enwindow[i];
814 v *= 1.0 / (1LL<<(16 + FRAC_BITS));
815 #elif WFRAC_BITS < 16
816 v = (v + (1 << (16 - WFRAC_BITS - 1))) >> (16 - WFRAC_BITS);
826 /* 32 sub band synthesis filter. Input: 32 sub band samples, Output:
828 /* XXX: optimize by avoiding ring buffer usage */
829 void RENAME(ff_mpa_synth_filter)(MPA_INT *synth_buf_ptr, int *synth_buf_offset,
830 MPA_INT *window, int *dither_state,
831 OUT_INT *samples, int incr,
832 INTFLOAT sb_samples[SBLIMIT])
834 register MPA_INT *synth_buf;
835 register const MPA_INT *w, *w2, *p;
840 #elif FRAC_BITS <= 15
847 offset = *synth_buf_offset;
848 synth_buf = synth_buf_ptr + offset;
850 #if FRAC_BITS <= 15 && !CONFIG_FLOAT
851 dct32(tmp, sb_samples);
853 /* NOTE: can cause a loss in precision if very high amplitude
855 synth_buf[j] = av_clip_int16(tmp[j]);
858 dct32(synth_buf, sb_samples);
861 /* copy to avoid wrap */
862 memcpy(synth_buf + 512, synth_buf, 32 * sizeof(*synth_buf));
864 samples2 = samples + 31 * incr;
870 SUM8(MACS, sum, w, p);
872 SUM8(MLSS, sum, w + 32, p);
873 *samples = round_sample(&sum);
877 /* we calculate two samples at the same time to avoid one memory
878 access per two sample */
881 p = synth_buf + 16 + j;
882 SUM8P2(sum, MACS, sum2, MLSS, w, w2, p);
883 p = synth_buf + 48 - j;
884 SUM8P2(sum, MLSS, sum2, MLSS, w + 32, w2 + 32, p);
886 *samples = round_sample(&sum);
889 *samples2 = round_sample(&sum);
896 SUM8(MLSS, sum, w + 32, p);
897 *samples = round_sample(&sum);
900 offset = (offset - 32) & 511;
901 *synth_buf_offset = offset;
904 #define C3 FIXHR(0.86602540378443864676/2)
906 /* 0.5 / cos(pi*(2*i+1)/36) */
907 static const INTFLOAT icos36[9] = {
908 FIXR(0.50190991877167369479),
909 FIXR(0.51763809020504152469), //0
910 FIXR(0.55168895948124587824),
911 FIXR(0.61038729438072803416),
912 FIXR(0.70710678118654752439), //1
913 FIXR(0.87172339781054900991),
914 FIXR(1.18310079157624925896),
915 FIXR(1.93185165257813657349), //2
916 FIXR(5.73685662283492756461),
919 /* 0.5 / cos(pi*(2*i+1)/36) */
920 static const INTFLOAT icos36h[9] = {
921 FIXHR(0.50190991877167369479/2),
922 FIXHR(0.51763809020504152469/2), //0
923 FIXHR(0.55168895948124587824/2),
924 FIXHR(0.61038729438072803416/2),
925 FIXHR(0.70710678118654752439/2), //1
926 FIXHR(0.87172339781054900991/2),
927 FIXHR(1.18310079157624925896/4),
928 FIXHR(1.93185165257813657349/4), //2
929 // FIXHR(5.73685662283492756461),
932 /* 12 points IMDCT. We compute it "by hand" by factorizing obvious
934 static void imdct12(INTFLOAT *out, INTFLOAT *in)
936 INTFLOAT in0, in1, in2, in3, in4, in5, t1, t2;
939 in1= in[1*3] + in[0*3];
940 in2= in[2*3] + in[1*3];
941 in3= in[3*3] + in[2*3];
942 in4= in[4*3] + in[3*3];
943 in5= in[5*3] + in[4*3];
947 in2= MULH3(in2, C3, 2);
948 in3= MULH3(in3, C3, 4);
951 t2 = MULH3(in1 - in5, icos36h[4], 2);
961 in1 = MULH3(in5 + in3, icos36h[1], 1);
968 in5 = MULH3(in5 - in3, icos36h[7], 2);
976 #define C1 FIXHR(0.98480775301220805936/2)
977 #define C2 FIXHR(0.93969262078590838405/2)
978 #define C3 FIXHR(0.86602540378443864676/2)
979 #define C4 FIXHR(0.76604444311897803520/2)
980 #define C5 FIXHR(0.64278760968653932632/2)
981 #define C6 FIXHR(0.5/2)
982 #define C7 FIXHR(0.34202014332566873304/2)
983 #define C8 FIXHR(0.17364817766693034885/2)
986 /* using Lee like decomposition followed by hand coded 9 points DCT */
987 static void imdct36(INTFLOAT *out, INTFLOAT *buf, INTFLOAT *in, INTFLOAT *win)
990 INTFLOAT t0, t1, t2, t3, s0, s1, s2, s3;
991 INTFLOAT tmp[18], *tmp1, *in1;
1002 t2 = in1[2*4] + in1[2*8] - in1[2*2];
1004 t3 = in1[2*0] + SHR(in1[2*6],1);
1005 t1 = in1[2*0] - in1[2*6];
1006 tmp1[ 6] = t1 - SHR(t2,1);
1009 t0 = MULH3(in1[2*2] + in1[2*4] , C2, 2);
1010 t1 = MULH3(in1[2*4] - in1[2*8] , -2*C8, 1);
1011 t2 = MULH3(in1[2*2] + in1[2*8] , -C4, 2);
1013 tmp1[10] = t3 - t0 - t2;
1014 tmp1[ 2] = t3 + t0 + t1;
1015 tmp1[14] = t3 + t2 - t1;
1017 tmp1[ 4] = MULH3(in1[2*5] + in1[2*7] - in1[2*1], -C3, 2);
1018 t2 = MULH3(in1[2*1] + in1[2*5], C1, 2);
1019 t3 = MULH3(in1[2*5] - in1[2*7], -2*C7, 1);
1020 t0 = MULH3(in1[2*3], C3, 2);
1022 t1 = MULH3(in1[2*1] + in1[2*7], -C5, 2);
1024 tmp1[ 0] = t2 + t3 + t0;
1025 tmp1[12] = t2 + t1 - t0;
1026 tmp1[ 8] = t3 - t1 - t0;
1038 s1 = MULH3(t3 + t2, icos36h[j], 2);
1039 s3 = MULLx(t3 - t2, icos36[8 - j], FRAC_BITS);
1043 out[(9 + j)*SBLIMIT] = MULH3(t1, win[9 + j], 1) + buf[9 + j];
1044 out[(8 - j)*SBLIMIT] = MULH3(t1, win[8 - j], 1) + buf[8 - j];
1045 buf[9 + j] = MULH3(t0, win[18 + 9 + j], 1);
1046 buf[8 - j] = MULH3(t0, win[18 + 8 - j], 1);
1050 out[(9 + 8 - j)*SBLIMIT] = MULH3(t1, win[9 + 8 - j], 1) + buf[9 + 8 - j];
1051 out[( j)*SBLIMIT] = MULH3(t1, win[ j], 1) + buf[ j];
1052 buf[9 + 8 - j] = MULH3(t0, win[18 + 9 + 8 - j], 1);
1053 buf[ + j] = MULH3(t0, win[18 + j], 1);
1058 s1 = MULH3(tmp[17], icos36h[4], 2);
1061 out[(9 + 4)*SBLIMIT] = MULH3(t1, win[9 + 4], 1) + buf[9 + 4];
1062 out[(8 - 4)*SBLIMIT] = MULH3(t1, win[8 - 4], 1) + buf[8 - 4];
1063 buf[9 + 4] = MULH3(t0, win[18 + 9 + 4], 1);
1064 buf[8 - 4] = MULH3(t0, win[18 + 8 - 4], 1);
1067 /* return the number of decoded frames */
1068 static int mp_decode_layer1(MPADecodeContext *s)
1070 int bound, i, v, n, ch, j, mant;
1071 uint8_t allocation[MPA_MAX_CHANNELS][SBLIMIT];
1072 uint8_t scale_factors[MPA_MAX_CHANNELS][SBLIMIT];
1074 if (s->mode == MPA_JSTEREO)
1075 bound = (s->mode_ext + 1) * 4;
1079 /* allocation bits */
1080 for(i=0;i<bound;i++) {
1081 for(ch=0;ch<s->nb_channels;ch++) {
1082 allocation[ch][i] = get_bits(&s->gb, 4);
1085 for(i=bound;i<SBLIMIT;i++) {
1086 allocation[0][i] = get_bits(&s->gb, 4);
1090 for(i=0;i<bound;i++) {
1091 for(ch=0;ch<s->nb_channels;ch++) {
1092 if (allocation[ch][i])
1093 scale_factors[ch][i] = get_bits(&s->gb, 6);
1096 for(i=bound;i<SBLIMIT;i++) {
1097 if (allocation[0][i]) {
1098 scale_factors[0][i] = get_bits(&s->gb, 6);
1099 scale_factors[1][i] = get_bits(&s->gb, 6);
1103 /* compute samples */
1105 for(i=0;i<bound;i++) {
1106 for(ch=0;ch<s->nb_channels;ch++) {
1107 n = allocation[ch][i];
1109 mant = get_bits(&s->gb, n + 1);
1110 v = l1_unscale(n, mant, scale_factors[ch][i]);
1114 s->sb_samples[ch][j][i] = v;
1117 for(i=bound;i<SBLIMIT;i++) {
1118 n = allocation[0][i];
1120 mant = get_bits(&s->gb, n + 1);
1121 v = l1_unscale(n, mant, scale_factors[0][i]);
1122 s->sb_samples[0][j][i] = v;
1123 v = l1_unscale(n, mant, scale_factors[1][i]);
1124 s->sb_samples[1][j][i] = v;
1126 s->sb_samples[0][j][i] = 0;
1127 s->sb_samples[1][j][i] = 0;
1134 static int mp_decode_layer2(MPADecodeContext *s)
1136 int sblimit; /* number of used subbands */
1137 const unsigned char *alloc_table;
1138 int table, bit_alloc_bits, i, j, ch, bound, v;
1139 unsigned char bit_alloc[MPA_MAX_CHANNELS][SBLIMIT];
1140 unsigned char scale_code[MPA_MAX_CHANNELS][SBLIMIT];
1141 unsigned char scale_factors[MPA_MAX_CHANNELS][SBLIMIT][3], *sf;
1142 int scale, qindex, bits, steps, k, l, m, b;
1144 /* select decoding table */
1145 table = ff_mpa_l2_select_table(s->bit_rate / 1000, s->nb_channels,
1146 s->sample_rate, s->lsf);
1147 sblimit = ff_mpa_sblimit_table[table];
1148 alloc_table = ff_mpa_alloc_tables[table];
1150 if (s->mode == MPA_JSTEREO)
1151 bound = (s->mode_ext + 1) * 4;
1155 dprintf(s->avctx, "bound=%d sblimit=%d\n", bound, sblimit);
1158 if( bound > sblimit ) bound = sblimit;
1160 /* parse bit allocation */
1162 for(i=0;i<bound;i++) {
1163 bit_alloc_bits = alloc_table[j];
1164 for(ch=0;ch<s->nb_channels;ch++) {
1165 bit_alloc[ch][i] = get_bits(&s->gb, bit_alloc_bits);
1167 j += 1 << bit_alloc_bits;
1169 for(i=bound;i<sblimit;i++) {
1170 bit_alloc_bits = alloc_table[j];
1171 v = get_bits(&s->gb, bit_alloc_bits);
1172 bit_alloc[0][i] = v;
1173 bit_alloc[1][i] = v;
1174 j += 1 << bit_alloc_bits;
1178 for(i=0;i<sblimit;i++) {
1179 for(ch=0;ch<s->nb_channels;ch++) {
1180 if (bit_alloc[ch][i])
1181 scale_code[ch][i] = get_bits(&s->gb, 2);
1186 for(i=0;i<sblimit;i++) {
1187 for(ch=0;ch<s->nb_channels;ch++) {
1188 if (bit_alloc[ch][i]) {
1189 sf = scale_factors[ch][i];
1190 switch(scale_code[ch][i]) {
1193 sf[0] = get_bits(&s->gb, 6);
1194 sf[1] = get_bits(&s->gb, 6);
1195 sf[2] = get_bits(&s->gb, 6);
1198 sf[0] = get_bits(&s->gb, 6);
1203 sf[0] = get_bits(&s->gb, 6);
1204 sf[2] = get_bits(&s->gb, 6);
1208 sf[0] = get_bits(&s->gb, 6);
1209 sf[2] = get_bits(&s->gb, 6);
1219 for(l=0;l<12;l+=3) {
1221 for(i=0;i<bound;i++) {
1222 bit_alloc_bits = alloc_table[j];
1223 for(ch=0;ch<s->nb_channels;ch++) {
1224 b = bit_alloc[ch][i];
1226 scale = scale_factors[ch][i][k];
1227 qindex = alloc_table[j+b];
1228 bits = ff_mpa_quant_bits[qindex];
1230 /* 3 values at the same time */
1231 v = get_bits(&s->gb, -bits);
1232 steps = ff_mpa_quant_steps[qindex];
1233 s->sb_samples[ch][k * 12 + l + 0][i] =
1234 l2_unscale_group(steps, v % steps, scale);
1236 s->sb_samples[ch][k * 12 + l + 1][i] =
1237 l2_unscale_group(steps, v % steps, scale);
1239 s->sb_samples[ch][k * 12 + l + 2][i] =
1240 l2_unscale_group(steps, v, scale);
1243 v = get_bits(&s->gb, bits);
1244 v = l1_unscale(bits - 1, v, scale);
1245 s->sb_samples[ch][k * 12 + l + m][i] = v;
1249 s->sb_samples[ch][k * 12 + l + 0][i] = 0;
1250 s->sb_samples[ch][k * 12 + l + 1][i] = 0;
1251 s->sb_samples[ch][k * 12 + l + 2][i] = 0;
1254 /* next subband in alloc table */
1255 j += 1 << bit_alloc_bits;
1257 /* XXX: find a way to avoid this duplication of code */
1258 for(i=bound;i<sblimit;i++) {
1259 bit_alloc_bits = alloc_table[j];
1260 b = bit_alloc[0][i];
1262 int mant, scale0, scale1;
1263 scale0 = scale_factors[0][i][k];
1264 scale1 = scale_factors[1][i][k];
1265 qindex = alloc_table[j+b];
1266 bits = ff_mpa_quant_bits[qindex];
1268 /* 3 values at the same time */
1269 v = get_bits(&s->gb, -bits);
1270 steps = ff_mpa_quant_steps[qindex];
1273 s->sb_samples[0][k * 12 + l + 0][i] =
1274 l2_unscale_group(steps, mant, scale0);
1275 s->sb_samples[1][k * 12 + l + 0][i] =
1276 l2_unscale_group(steps, mant, scale1);
1279 s->sb_samples[0][k * 12 + l + 1][i] =
1280 l2_unscale_group(steps, mant, scale0);
1281 s->sb_samples[1][k * 12 + l + 1][i] =
1282 l2_unscale_group(steps, mant, scale1);
1283 s->sb_samples[0][k * 12 + l + 2][i] =
1284 l2_unscale_group(steps, v, scale0);
1285 s->sb_samples[1][k * 12 + l + 2][i] =
1286 l2_unscale_group(steps, v, scale1);
1289 mant = get_bits(&s->gb, bits);
1290 s->sb_samples[0][k * 12 + l + m][i] =
1291 l1_unscale(bits - 1, mant, scale0);
1292 s->sb_samples[1][k * 12 + l + m][i] =
1293 l1_unscale(bits - 1, mant, scale1);
1297 s->sb_samples[0][k * 12 + l + 0][i] = 0;
1298 s->sb_samples[0][k * 12 + l + 1][i] = 0;
1299 s->sb_samples[0][k * 12 + l + 2][i] = 0;
1300 s->sb_samples[1][k * 12 + l + 0][i] = 0;
1301 s->sb_samples[1][k * 12 + l + 1][i] = 0;
1302 s->sb_samples[1][k * 12 + l + 2][i] = 0;
1304 /* next subband in alloc table */
1305 j += 1 << bit_alloc_bits;
1307 /* fill remaining samples to zero */
1308 for(i=sblimit;i<SBLIMIT;i++) {
1309 for(ch=0;ch<s->nb_channels;ch++) {
1310 s->sb_samples[ch][k * 12 + l + 0][i] = 0;
1311 s->sb_samples[ch][k * 12 + l + 1][i] = 0;
1312 s->sb_samples[ch][k * 12 + l + 2][i] = 0;
1320 #define SPLIT(dst,sf,n)\
1322 int m= (sf*171)>>9;\
1329 int m= (sf*205)>>10;\
1333 int m= (sf*171)>>10;\
1340 static av_always_inline void lsf_sf_expand(int *slen,
1341 int sf, int n1, int n2, int n3)
1343 SPLIT(slen[3], sf, n3)
1344 SPLIT(slen[2], sf, n2)
1345 SPLIT(slen[1], sf, n1)
1349 static void exponents_from_scale_factors(MPADecodeContext *s,
1353 const uint8_t *bstab, *pretab;
1354 int len, i, j, k, l, v0, shift, gain, gains[3];
1357 exp_ptr = exponents;
1358 gain = g->global_gain - 210;
1359 shift = g->scalefac_scale + 1;
1361 bstab = band_size_long[s->sample_rate_index];
1362 pretab = mpa_pretab[g->preflag];
1363 for(i=0;i<g->long_end;i++) {
1364 v0 = gain - ((g->scale_factors[i] + pretab[i]) << shift) + 400;
1370 if (g->short_start < 13) {
1371 bstab = band_size_short[s->sample_rate_index];
1372 gains[0] = gain - (g->subblock_gain[0] << 3);
1373 gains[1] = gain - (g->subblock_gain[1] << 3);
1374 gains[2] = gain - (g->subblock_gain[2] << 3);
1376 for(i=g->short_start;i<13;i++) {
1379 v0 = gains[l] - (g->scale_factors[k++] << shift) + 400;
1387 /* handle n = 0 too */
1388 static inline int get_bitsz(GetBitContext *s, int n)
1393 return get_bits(s, n);
1397 static void switch_buffer(MPADecodeContext *s, int *pos, int *end_pos, int *end_pos2){
1398 if(s->in_gb.buffer && *pos >= s->gb.size_in_bits){
1400 s->in_gb.buffer=NULL;
1401 assert((get_bits_count(&s->gb) & 7) == 0);
1402 skip_bits_long(&s->gb, *pos - *end_pos);
1404 *end_pos= *end_pos2 + get_bits_count(&s->gb) - *pos;
1405 *pos= get_bits_count(&s->gb);
1409 /* Following is a optimized code for
1411 if(get_bits1(&s->gb))
1416 #define READ_FLIP_SIGN(dst,src)\
1417 v = AV_RN32A(src) ^ (get_bits1(&s->gb)<<31);\
1420 #define READ_FLIP_SIGN(dst,src)\
1421 v= -get_bits1(&s->gb);\
1422 *(dst) = (*(src) ^ v) - v;
1425 static int huffman_decode(MPADecodeContext *s, GranuleDef *g,
1426 int16_t *exponents, int end_pos2)
1430 int last_pos, bits_left;
1432 int end_pos= FFMIN(end_pos2, s->gb.size_in_bits);
1434 /* low frequencies (called big values) */
1437 int j, k, l, linbits;
1438 j = g->region_size[i];
1441 /* select vlc table */
1442 k = g->table_select[i];
1443 l = mpa_huff_data[k][0];
1444 linbits = mpa_huff_data[k][1];
1448 memset(&g->sb_hybrid[s_index], 0, sizeof(*g->sb_hybrid)*2*j);
1453 /* read huffcode and compute each couple */
1457 int pos= get_bits_count(&s->gb);
1459 if (pos >= end_pos){
1460 // av_log(NULL, AV_LOG_ERROR, "pos: %d %d %d %d\n", pos, end_pos, end_pos2, s_index);
1461 switch_buffer(s, &pos, &end_pos, &end_pos2);
1462 // av_log(NULL, AV_LOG_ERROR, "new pos: %d %d\n", pos, end_pos);
1466 y = get_vlc2(&s->gb, vlc->table, 7, 3);
1469 g->sb_hybrid[s_index ] =
1470 g->sb_hybrid[s_index+1] = 0;
1475 exponent= exponents[s_index];
1477 dprintf(s->avctx, "region=%d n=%d x=%d y=%d exp=%d\n",
1478 i, g->region_size[i] - j, x, y, exponent);
1483 READ_FLIP_SIGN(g->sb_hybrid+s_index, RENAME(expval_table)[ exponent ]+x)
1485 x += get_bitsz(&s->gb, linbits);
1486 v = l3_unscale(x, exponent);
1487 if (get_bits1(&s->gb))
1489 g->sb_hybrid[s_index] = v;
1492 READ_FLIP_SIGN(g->sb_hybrid+s_index+1, RENAME(expval_table)[ exponent ]+y)
1494 y += get_bitsz(&s->gb, linbits);
1495 v = l3_unscale(y, exponent);
1496 if (get_bits1(&s->gb))
1498 g->sb_hybrid[s_index+1] = v;
1505 READ_FLIP_SIGN(g->sb_hybrid+s_index+!!y, RENAME(expval_table)[ exponent ]+x)
1507 x += get_bitsz(&s->gb, linbits);
1508 v = l3_unscale(x, exponent);
1509 if (get_bits1(&s->gb))
1511 g->sb_hybrid[s_index+!!y] = v;
1513 g->sb_hybrid[s_index+ !y] = 0;
1519 /* high frequencies */
1520 vlc = &huff_quad_vlc[g->count1table_select];
1522 while (s_index <= 572) {
1524 pos = get_bits_count(&s->gb);
1525 if (pos >= end_pos) {
1526 if (pos > end_pos2 && last_pos){
1527 /* some encoders generate an incorrect size for this
1528 part. We must go back into the data */
1530 skip_bits_long(&s->gb, last_pos - pos);
1531 av_log(s->avctx, AV_LOG_INFO, "overread, skip %d enddists: %d %d\n", last_pos - pos, end_pos-pos, end_pos2-pos);
1532 if(s->error_recognition >= FF_ER_COMPLIANT)
1536 // av_log(NULL, AV_LOG_ERROR, "pos2: %d %d %d %d\n", pos, end_pos, end_pos2, s_index);
1537 switch_buffer(s, &pos, &end_pos, &end_pos2);
1538 // av_log(NULL, AV_LOG_ERROR, "new pos2: %d %d %d\n", pos, end_pos, s_index);
1544 code = get_vlc2(&s->gb, vlc->table, vlc->bits, 1);
1545 dprintf(s->avctx, "t=%d code=%d\n", g->count1table_select, code);
1546 g->sb_hybrid[s_index+0]=
1547 g->sb_hybrid[s_index+1]=
1548 g->sb_hybrid[s_index+2]=
1549 g->sb_hybrid[s_index+3]= 0;
1551 static const int idxtab[16]={3,3,2,2,1,1,1,1,0,0,0,0,0,0,0,0};
1553 int pos= s_index+idxtab[code];
1554 code ^= 8>>idxtab[code];
1555 READ_FLIP_SIGN(g->sb_hybrid+pos, RENAME(exp_table)+exponents[pos])
1559 /* skip extension bits */
1560 bits_left = end_pos2 - get_bits_count(&s->gb);
1561 //av_log(NULL, AV_LOG_ERROR, "left:%d buf:%p\n", bits_left, s->in_gb.buffer);
1562 if (bits_left < 0 && s->error_recognition >= FF_ER_COMPLIANT) {
1563 av_log(s->avctx, AV_LOG_ERROR, "bits_left=%d\n", bits_left);
1565 }else if(bits_left > 0 && s->error_recognition >= FF_ER_AGGRESSIVE){
1566 av_log(s->avctx, AV_LOG_ERROR, "bits_left=%d\n", bits_left);
1569 memset(&g->sb_hybrid[s_index], 0, sizeof(*g->sb_hybrid)*(576 - s_index));
1570 skip_bits_long(&s->gb, bits_left);
1572 i= get_bits_count(&s->gb);
1573 switch_buffer(s, &i, &end_pos, &end_pos2);
1578 /* Reorder short blocks from bitstream order to interleaved order. It
1579 would be faster to do it in parsing, but the code would be far more
1581 static void reorder_block(MPADecodeContext *s, GranuleDef *g)
1584 INTFLOAT *ptr, *dst, *ptr1;
1587 if (g->block_type != 2)
1590 if (g->switch_point) {
1591 if (s->sample_rate_index != 8) {
1592 ptr = g->sb_hybrid + 36;
1594 ptr = g->sb_hybrid + 48;
1600 for(i=g->short_start;i<13;i++) {
1601 len = band_size_short[s->sample_rate_index][i];
1604 for(j=len;j>0;j--) {
1605 *dst++ = ptr[0*len];
1606 *dst++ = ptr[1*len];
1607 *dst++ = ptr[2*len];
1611 memcpy(ptr1, tmp, len * 3 * sizeof(*ptr1));
1615 #define ISQRT2 FIXR(0.70710678118654752440)
1617 static void compute_stereo(MPADecodeContext *s,
1618 GranuleDef *g0, GranuleDef *g1)
1621 int sf_max, sf, len, non_zero_found;
1622 INTFLOAT (*is_tab)[16], *tab0, *tab1, tmp0, tmp1, v1, v2;
1623 int non_zero_found_short[3];
1625 /* intensity stereo */
1626 if (s->mode_ext & MODE_EXT_I_STEREO) {
1631 is_tab = is_table_lsf[g1->scalefac_compress & 1];
1635 tab0 = g0->sb_hybrid + 576;
1636 tab1 = g1->sb_hybrid + 576;
1638 non_zero_found_short[0] = 0;
1639 non_zero_found_short[1] = 0;
1640 non_zero_found_short[2] = 0;
1641 k = (13 - g1->short_start) * 3 + g1->long_end - 3;
1642 for(i = 12;i >= g1->short_start;i--) {
1643 /* for last band, use previous scale factor */
1646 len = band_size_short[s->sample_rate_index][i];
1650 if (!non_zero_found_short[l]) {
1651 /* test if non zero band. if so, stop doing i-stereo */
1652 for(j=0;j<len;j++) {
1654 non_zero_found_short[l] = 1;
1658 sf = g1->scale_factors[k + l];
1664 for(j=0;j<len;j++) {
1666 tab0[j] = MULLx(tmp0, v1, FRAC_BITS);
1667 tab1[j] = MULLx(tmp0, v2, FRAC_BITS);
1671 if (s->mode_ext & MODE_EXT_MS_STEREO) {
1672 /* lower part of the spectrum : do ms stereo
1674 for(j=0;j<len;j++) {
1677 tab0[j] = MULLx(tmp0 + tmp1, ISQRT2, FRAC_BITS);
1678 tab1[j] = MULLx(tmp0 - tmp1, ISQRT2, FRAC_BITS);
1685 non_zero_found = non_zero_found_short[0] |
1686 non_zero_found_short[1] |
1687 non_zero_found_short[2];
1689 for(i = g1->long_end - 1;i >= 0;i--) {
1690 len = band_size_long[s->sample_rate_index][i];
1693 /* test if non zero band. if so, stop doing i-stereo */
1694 if (!non_zero_found) {
1695 for(j=0;j<len;j++) {
1701 /* for last band, use previous scale factor */
1702 k = (i == 21) ? 20 : i;
1703 sf = g1->scale_factors[k];
1708 for(j=0;j<len;j++) {
1710 tab0[j] = MULLx(tmp0, v1, FRAC_BITS);
1711 tab1[j] = MULLx(tmp0, v2, FRAC_BITS);
1715 if (s->mode_ext & MODE_EXT_MS_STEREO) {
1716 /* lower part of the spectrum : do ms stereo
1718 for(j=0;j<len;j++) {
1721 tab0[j] = MULLx(tmp0 + tmp1, ISQRT2, FRAC_BITS);
1722 tab1[j] = MULLx(tmp0 - tmp1, ISQRT2, FRAC_BITS);
1727 } else if (s->mode_ext & MODE_EXT_MS_STEREO) {
1728 /* ms stereo ONLY */
1729 /* NOTE: the 1/sqrt(2) normalization factor is included in the
1731 tab0 = g0->sb_hybrid;
1732 tab1 = g1->sb_hybrid;
1733 for(i=0;i<576;i++) {
1736 tab0[i] = tmp0 + tmp1;
1737 tab1[i] = tmp0 - tmp1;
1742 static void compute_antialias_integer(MPADecodeContext *s,
1748 /* we antialias only "long" bands */
1749 if (g->block_type == 2) {
1750 if (!g->switch_point)
1752 /* XXX: check this for 8000Hz case */
1758 ptr = g->sb_hybrid + 18;
1759 for(i = n;i > 0;i--) {
1760 int tmp0, tmp1, tmp2;
1761 csa = &csa_table[0][0];
1765 tmp2= MULH(tmp0 + tmp1, csa[0+4*j]);\
1766 ptr[-1-j] = 4*(tmp2 - MULH(tmp1, csa[2+4*j]));\
1767 ptr[ j] = 4*(tmp2 + MULH(tmp0, csa[3+4*j]));
1782 static void compute_antialias_float(MPADecodeContext *s,
1788 /* we antialias only "long" bands */
1789 if (g->block_type == 2) {
1790 if (!g->switch_point)
1792 /* XXX: check this for 8000Hz case */
1798 ptr = g->sb_hybrid + 18;
1799 for(i = n;i > 0;i--) {
1801 float *csa = &csa_table_float[0][0];
1802 #define FLOAT_AA(j)\
1805 ptr[-1-j] = tmp0 * csa[0+4*j] - tmp1 * csa[1+4*j];\
1806 ptr[ j] = tmp0 * csa[1+4*j] + tmp1 * csa[0+4*j];
1821 static void compute_imdct(MPADecodeContext *s,
1823 INTFLOAT *sb_samples,
1826 INTFLOAT *win, *win1, *out_ptr, *ptr, *buf, *ptr1;
1828 int i, j, mdct_long_end, sblimit;
1830 /* find last non zero block */
1831 ptr = g->sb_hybrid + 576;
1832 ptr1 = g->sb_hybrid + 2 * 18;
1833 while (ptr >= ptr1) {
1837 if(p[0] | p[1] | p[2] | p[3] | p[4] | p[5])
1840 sblimit = ((ptr - g->sb_hybrid) / 18) + 1;
1842 if (g->block_type == 2) {
1843 /* XXX: check for 8000 Hz */
1844 if (g->switch_point)
1849 mdct_long_end = sblimit;
1854 for(j=0;j<mdct_long_end;j++) {
1855 /* apply window & overlap with previous buffer */
1856 out_ptr = sb_samples + j;
1858 if (g->switch_point && j < 2)
1861 win1 = mdct_win[g->block_type];
1862 /* select frequency inversion */
1863 win = win1 + ((4 * 36) & -(j & 1));
1864 imdct36(out_ptr, buf, ptr, win);
1865 out_ptr += 18*SBLIMIT;
1869 for(j=mdct_long_end;j<sblimit;j++) {
1870 /* select frequency inversion */
1871 win = mdct_win[2] + ((4 * 36) & -(j & 1));
1872 out_ptr = sb_samples + j;
1878 imdct12(out2, ptr + 0);
1880 *out_ptr = MULH3(out2[i ], win[i ], 1) + buf[i + 6*1];
1881 buf[i + 6*2] = MULH3(out2[i + 6], win[i + 6], 1);
1884 imdct12(out2, ptr + 1);
1886 *out_ptr = MULH3(out2[i ], win[i ], 1) + buf[i + 6*2];
1887 buf[i + 6*0] = MULH3(out2[i + 6], win[i + 6], 1);
1890 imdct12(out2, ptr + 2);
1892 buf[i + 6*0] = MULH3(out2[i ], win[i ], 1) + buf[i + 6*0];
1893 buf[i + 6*1] = MULH3(out2[i + 6], win[i + 6], 1);
1900 for(j=sblimit;j<SBLIMIT;j++) {
1902 out_ptr = sb_samples + j;
1912 /* main layer3 decoding function */
1913 static int mp_decode_layer3(MPADecodeContext *s)
1915 int nb_granules, main_data_begin, private_bits;
1916 int gr, ch, blocksplit_flag, i, j, k, n, bits_pos;
1918 int16_t exponents[576]; //FIXME try INTFLOAT
1920 /* read side info */
1922 main_data_begin = get_bits(&s->gb, 8);
1923 private_bits = get_bits(&s->gb, s->nb_channels);
1926 main_data_begin = get_bits(&s->gb, 9);
1927 if (s->nb_channels == 2)
1928 private_bits = get_bits(&s->gb, 3);
1930 private_bits = get_bits(&s->gb, 5);
1932 for(ch=0;ch<s->nb_channels;ch++) {
1933 s->granules[ch][0].scfsi = 0;/* all scale factors are transmitted */
1934 s->granules[ch][1].scfsi = get_bits(&s->gb, 4);
1938 for(gr=0;gr<nb_granules;gr++) {
1939 for(ch=0;ch<s->nb_channels;ch++) {
1940 dprintf(s->avctx, "gr=%d ch=%d: side_info\n", gr, ch);
1941 g = &s->granules[ch][gr];
1942 g->part2_3_length = get_bits(&s->gb, 12);
1943 g->big_values = get_bits(&s->gb, 9);
1944 if(g->big_values > 288){
1945 av_log(s->avctx, AV_LOG_ERROR, "big_values too big\n");
1949 g->global_gain = get_bits(&s->gb, 8);
1950 /* if MS stereo only is selected, we precompute the
1951 1/sqrt(2) renormalization factor */
1952 if ((s->mode_ext & (MODE_EXT_MS_STEREO | MODE_EXT_I_STEREO)) ==
1954 g->global_gain -= 2;
1956 g->scalefac_compress = get_bits(&s->gb, 9);
1958 g->scalefac_compress = get_bits(&s->gb, 4);
1959 blocksplit_flag = get_bits1(&s->gb);
1960 if (blocksplit_flag) {
1961 g->block_type = get_bits(&s->gb, 2);
1962 if (g->block_type == 0){
1963 av_log(s->avctx, AV_LOG_ERROR, "invalid block type\n");
1966 g->switch_point = get_bits1(&s->gb);
1968 g->table_select[i] = get_bits(&s->gb, 5);
1970 g->subblock_gain[i] = get_bits(&s->gb, 3);
1971 ff_init_short_region(s, g);
1973 int region_address1, region_address2;
1975 g->switch_point = 0;
1977 g->table_select[i] = get_bits(&s->gb, 5);
1978 /* compute huffman coded region sizes */
1979 region_address1 = get_bits(&s->gb, 4);
1980 region_address2 = get_bits(&s->gb, 3);
1981 dprintf(s->avctx, "region1=%d region2=%d\n",
1982 region_address1, region_address2);
1983 ff_init_long_region(s, g, region_address1, region_address2);
1985 ff_region_offset2size(g);
1986 ff_compute_band_indexes(s, g);
1990 g->preflag = get_bits1(&s->gb);
1991 g->scalefac_scale = get_bits1(&s->gb);
1992 g->count1table_select = get_bits1(&s->gb);
1993 dprintf(s->avctx, "block_type=%d switch_point=%d\n",
1994 g->block_type, g->switch_point);
1999 const uint8_t *ptr = s->gb.buffer + (get_bits_count(&s->gb)>>3);
2000 assert((get_bits_count(&s->gb) & 7) == 0);
2001 /* now we get bits from the main_data_begin offset */
2002 dprintf(s->avctx, "seekback: %d\n", main_data_begin);
2003 //av_log(NULL, AV_LOG_ERROR, "backstep:%d, lastbuf:%d\n", main_data_begin, s->last_buf_size);
2005 memcpy(s->last_buf + s->last_buf_size, ptr, EXTRABYTES);
2007 init_get_bits(&s->gb, s->last_buf, s->last_buf_size*8);
2008 skip_bits_long(&s->gb, 8*(s->last_buf_size - main_data_begin));
2011 for(gr=0;gr<nb_granules;gr++) {
2012 for(ch=0;ch<s->nb_channels;ch++) {
2013 g = &s->granules[ch][gr];
2014 if(get_bits_count(&s->gb)<0){
2015 av_log(s->avctx, AV_LOG_DEBUG, "mdb:%d, lastbuf:%d skipping granule %d\n",
2016 main_data_begin, s->last_buf_size, gr);
2017 skip_bits_long(&s->gb, g->part2_3_length);
2018 memset(g->sb_hybrid, 0, sizeof(g->sb_hybrid));
2019 if(get_bits_count(&s->gb) >= s->gb.size_in_bits && s->in_gb.buffer){
2020 skip_bits_long(&s->in_gb, get_bits_count(&s->gb) - s->gb.size_in_bits);
2022 s->in_gb.buffer=NULL;
2027 bits_pos = get_bits_count(&s->gb);
2031 int slen, slen1, slen2;
2033 /* MPEG1 scale factors */
2034 slen1 = slen_table[0][g->scalefac_compress];
2035 slen2 = slen_table[1][g->scalefac_compress];
2036 dprintf(s->avctx, "slen1=%d slen2=%d\n", slen1, slen2);
2037 if (g->block_type == 2) {
2038 n = g->switch_point ? 17 : 18;
2042 g->scale_factors[j++] = get_bits(&s->gb, slen1);
2045 g->scale_factors[j++] = 0;
2049 g->scale_factors[j++] = get_bits(&s->gb, slen2);
2051 g->scale_factors[j++] = 0;
2054 g->scale_factors[j++] = 0;
2057 sc = s->granules[ch][0].scale_factors;
2060 n = (k == 0 ? 6 : 5);
2061 if ((g->scfsi & (0x8 >> k)) == 0) {
2062 slen = (k < 2) ? slen1 : slen2;
2065 g->scale_factors[j++] = get_bits(&s->gb, slen);
2068 g->scale_factors[j++] = 0;
2071 /* simply copy from last granule */
2073 g->scale_factors[j] = sc[j];
2078 g->scale_factors[j++] = 0;
2081 int tindex, tindex2, slen[4], sl, sf;
2083 /* LSF scale factors */
2084 if (g->block_type == 2) {
2085 tindex = g->switch_point ? 2 : 1;
2089 sf = g->scalefac_compress;
2090 if ((s->mode_ext & MODE_EXT_I_STEREO) && ch == 1) {
2091 /* intensity stereo case */
2094 lsf_sf_expand(slen, sf, 6, 6, 0);
2096 } else if (sf < 244) {
2097 lsf_sf_expand(slen, sf - 180, 4, 4, 0);
2100 lsf_sf_expand(slen, sf - 244, 3, 0, 0);
2106 lsf_sf_expand(slen, sf, 5, 4, 4);
2108 } else if (sf < 500) {
2109 lsf_sf_expand(slen, sf - 400, 5, 4, 0);
2112 lsf_sf_expand(slen, sf - 500, 3, 0, 0);
2120 n = lsf_nsf_table[tindex2][tindex][k];
2124 g->scale_factors[j++] = get_bits(&s->gb, sl);
2127 g->scale_factors[j++] = 0;
2130 /* XXX: should compute exact size */
2132 g->scale_factors[j] = 0;
2135 exponents_from_scale_factors(s, g, exponents);
2137 /* read Huffman coded residue */
2138 huffman_decode(s, g, exponents, bits_pos + g->part2_3_length);
2141 if (s->nb_channels == 2)
2142 compute_stereo(s, &s->granules[0][gr], &s->granules[1][gr]);
2144 for(ch=0;ch<s->nb_channels;ch++) {
2145 g = &s->granules[ch][gr];
2147 reorder_block(s, g);
2148 compute_antialias(s, g);
2149 compute_imdct(s, g, &s->sb_samples[ch][18 * gr][0], s->mdct_buf[ch]);
2152 if(get_bits_count(&s->gb)<0)
2153 skip_bits_long(&s->gb, -get_bits_count(&s->gb));
2154 return nb_granules * 18;
2157 static int mp_decode_frame(MPADecodeContext *s,
2158 OUT_INT *samples, const uint8_t *buf, int buf_size)
2160 int i, nb_frames, ch;
2161 OUT_INT *samples_ptr;
2163 init_get_bits(&s->gb, buf + HEADER_SIZE, (buf_size - HEADER_SIZE)*8);
2165 /* skip error protection field */
2166 if (s->error_protection)
2167 skip_bits(&s->gb, 16);
2169 dprintf(s->avctx, "frame %d:\n", s->frame_count);
2172 s->avctx->frame_size = 384;
2173 nb_frames = mp_decode_layer1(s);
2176 s->avctx->frame_size = 1152;
2177 nb_frames = mp_decode_layer2(s);
2180 s->avctx->frame_size = s->lsf ? 576 : 1152;
2182 nb_frames = mp_decode_layer3(s);
2185 if(s->in_gb.buffer){
2186 align_get_bits(&s->gb);
2187 i= get_bits_left(&s->gb)>>3;
2188 if(i >= 0 && i <= BACKSTEP_SIZE){
2189 memmove(s->last_buf, s->gb.buffer + (get_bits_count(&s->gb)>>3), i);
2192 av_log(s->avctx, AV_LOG_ERROR, "invalid old backstep %d\n", i);
2194 s->in_gb.buffer= NULL;
2197 align_get_bits(&s->gb);
2198 assert((get_bits_count(&s->gb) & 7) == 0);
2199 i= get_bits_left(&s->gb)>>3;
2201 if(i<0 || i > BACKSTEP_SIZE || nb_frames<0){
2203 av_log(s->avctx, AV_LOG_ERROR, "invalid new backstep %d\n", i);
2204 i= FFMIN(BACKSTEP_SIZE, buf_size - HEADER_SIZE);
2206 assert(i <= buf_size - HEADER_SIZE && i>= 0);
2207 memcpy(s->last_buf + s->last_buf_size, s->gb.buffer + buf_size - HEADER_SIZE - i, i);
2208 s->last_buf_size += i;
2213 /* apply the synthesis filter */
2214 for(ch=0;ch<s->nb_channels;ch++) {
2215 samples_ptr = samples + ch;
2216 for(i=0;i<nb_frames;i++) {
2217 RENAME(ff_mpa_synth_filter)(s->synth_buf[ch], &(s->synth_buf_offset[ch]),
2218 RENAME(ff_mpa_synth_window), &s->dither_state,
2219 samples_ptr, s->nb_channels,
2220 s->sb_samples[ch][i]);
2221 samples_ptr += 32 * s->nb_channels;
2225 return nb_frames * 32 * sizeof(OUT_INT) * s->nb_channels;
2228 static int decode_frame(AVCodecContext * avctx,
2229 void *data, int *data_size,
2232 const uint8_t *buf = avpkt->data;
2233 int buf_size = avpkt->size;
2234 MPADecodeContext *s = avctx->priv_data;
2237 OUT_INT *out_samples = data;
2239 if(buf_size < HEADER_SIZE)
2242 header = AV_RB32(buf);
2243 if(ff_mpa_check_header(header) < 0){
2244 av_log(avctx, AV_LOG_ERROR, "Header missing\n");
2248 if (ff_mpegaudio_decode_header((MPADecodeHeader *)s, header) == 1) {
2249 /* free format: prepare to compute frame size */
2253 /* update codec info */
2254 avctx->channels = s->nb_channels;
2255 avctx->bit_rate = s->bit_rate;
2256 avctx->sub_id = s->layer;
2258 if(*data_size < 1152*avctx->channels*sizeof(OUT_INT))
2262 if(s->frame_size<=0 || s->frame_size > buf_size){
2263 av_log(avctx, AV_LOG_ERROR, "incomplete frame\n");
2265 }else if(s->frame_size < buf_size){
2266 av_log(avctx, AV_LOG_ERROR, "incorrect frame size\n");
2267 buf_size= s->frame_size;
2270 out_size = mp_decode_frame(s, out_samples, buf, buf_size);
2272 *data_size = out_size;
2273 avctx->sample_rate = s->sample_rate;
2274 //FIXME maybe move the other codec info stuff from above here too
2276 av_log(avctx, AV_LOG_DEBUG, "Error while decoding MPEG audio frame.\n"); //FIXME return -1 / but also return the number of bytes consumed
2281 static void flush(AVCodecContext *avctx){
2282 MPADecodeContext *s = avctx->priv_data;
2283 memset(s->synth_buf, 0, sizeof(s->synth_buf));
2284 s->last_buf_size= 0;
2287 #if CONFIG_MP3ADU_DECODER
2288 static int decode_frame_adu(AVCodecContext * avctx,
2289 void *data, int *data_size,
2292 const uint8_t *buf = avpkt->data;
2293 int buf_size = avpkt->size;
2294 MPADecodeContext *s = avctx->priv_data;
2297 OUT_INT *out_samples = data;
2301 // Discard too short frames
2302 if (buf_size < HEADER_SIZE) {
2308 if (len > MPA_MAX_CODED_FRAME_SIZE)
2309 len = MPA_MAX_CODED_FRAME_SIZE;
2311 // Get header and restore sync word
2312 header = AV_RB32(buf) | 0xffe00000;
2314 if (ff_mpa_check_header(header) < 0) { // Bad header, discard frame
2319 ff_mpegaudio_decode_header((MPADecodeHeader *)s, header);
2320 /* update codec info */
2321 avctx->sample_rate = s->sample_rate;
2322 avctx->channels = s->nb_channels;
2323 avctx->bit_rate = s->bit_rate;
2324 avctx->sub_id = s->layer;
2326 s->frame_size = len;
2328 if (avctx->parse_only) {
2329 out_size = buf_size;
2331 out_size = mp_decode_frame(s, out_samples, buf, buf_size);
2334 *data_size = out_size;
2337 #endif /* CONFIG_MP3ADU_DECODER */
2339 #if CONFIG_MP3ON4_DECODER
2342 * Context for MP3On4 decoder
2344 typedef struct MP3On4DecodeContext {
2345 int frames; ///< number of mp3 frames per block (number of mp3 decoder instances)
2346 int syncword; ///< syncword patch
2347 const uint8_t *coff; ///< channels offsets in output buffer
2348 MPADecodeContext *mp3decctx[5]; ///< MPADecodeContext for every decoder instance
2349 } MP3On4DecodeContext;
2351 #include "mpeg4audio.h"
2353 /* Next 3 arrays are indexed by channel config number (passed via codecdata) */
2354 static const uint8_t mp3Frames[8] = {0,1,1,2,3,3,4,5}; /* number of mp3 decoder instances */
2355 /* offsets into output buffer, assume output order is FL FR BL BR C LFE */
2356 static const uint8_t chan_offset[8][5] = {
2361 {2,0,3}, // C FLR BS
2362 {4,0,2}, // C FLR BLRS
2363 {4,0,2,5}, // C FLR BLRS LFE
2364 {4,0,2,6,5}, // C FLR BLRS BLR LFE
2368 static int decode_init_mp3on4(AVCodecContext * avctx)
2370 MP3On4DecodeContext *s = avctx->priv_data;
2371 MPEG4AudioConfig cfg;
2374 if ((avctx->extradata_size < 2) || (avctx->extradata == NULL)) {
2375 av_log(avctx, AV_LOG_ERROR, "Codec extradata missing or too short.\n");
2379 ff_mpeg4audio_get_config(&cfg, avctx->extradata, avctx->extradata_size);
2380 if (!cfg.chan_config || cfg.chan_config > 7) {
2381 av_log(avctx, AV_LOG_ERROR, "Invalid channel config number.\n");
2384 s->frames = mp3Frames[cfg.chan_config];
2385 s->coff = chan_offset[cfg.chan_config];
2386 avctx->channels = ff_mpeg4audio_channels[cfg.chan_config];
2388 if (cfg.sample_rate < 16000)
2389 s->syncword = 0xffe00000;
2391 s->syncword = 0xfff00000;
2393 /* Init the first mp3 decoder in standard way, so that all tables get builded
2394 * We replace avctx->priv_data with the context of the first decoder so that
2395 * decode_init() does not have to be changed.
2396 * Other decoders will be initialized here copying data from the first context
2398 // Allocate zeroed memory for the first decoder context
2399 s->mp3decctx[0] = av_mallocz(sizeof(MPADecodeContext));
2400 // Put decoder context in place to make init_decode() happy
2401 avctx->priv_data = s->mp3decctx[0];
2403 // Restore mp3on4 context pointer
2404 avctx->priv_data = s;
2405 s->mp3decctx[0]->adu_mode = 1; // Set adu mode
2407 /* Create a separate codec/context for each frame (first is already ok).
2408 * Each frame is 1 or 2 channels - up to 5 frames allowed
2410 for (i = 1; i < s->frames; i++) {
2411 s->mp3decctx[i] = av_mallocz(sizeof(MPADecodeContext));
2412 s->mp3decctx[i]->adu_mode = 1;
2413 s->mp3decctx[i]->avctx = avctx;
2420 static av_cold int decode_close_mp3on4(AVCodecContext * avctx)
2422 MP3On4DecodeContext *s = avctx->priv_data;
2425 for (i = 0; i < s->frames; i++)
2426 if (s->mp3decctx[i])
2427 av_free(s->mp3decctx[i]);
2433 static int decode_frame_mp3on4(AVCodecContext * avctx,
2434 void *data, int *data_size,
2437 const uint8_t *buf = avpkt->data;
2438 int buf_size = avpkt->size;
2439 MP3On4DecodeContext *s = avctx->priv_data;
2440 MPADecodeContext *m;
2441 int fsize, len = buf_size, out_size = 0;
2443 OUT_INT *out_samples = data;
2444 OUT_INT decoded_buf[MPA_FRAME_SIZE * MPA_MAX_CHANNELS];
2445 OUT_INT *outptr, *bp;
2448 if(*data_size < MPA_FRAME_SIZE * MPA_MAX_CHANNELS * s->frames * sizeof(OUT_INT))
2452 // Discard too short frames
2453 if (buf_size < HEADER_SIZE)
2456 // If only one decoder interleave is not needed
2457 outptr = s->frames == 1 ? out_samples : decoded_buf;
2459 avctx->bit_rate = 0;
2461 for (fr = 0; fr < s->frames; fr++) {
2462 fsize = AV_RB16(buf) >> 4;
2463 fsize = FFMIN3(fsize, len, MPA_MAX_CODED_FRAME_SIZE);
2464 m = s->mp3decctx[fr];
2467 header = (AV_RB32(buf) & 0x000fffff) | s->syncword; // patch header
2469 if (ff_mpa_check_header(header) < 0) // Bad header, discard block
2472 ff_mpegaudio_decode_header((MPADecodeHeader *)m, header);
2473 out_size += mp_decode_frame(m, outptr, buf, fsize);
2478 n = m->avctx->frame_size*m->nb_channels;
2479 /* interleave output data */
2480 bp = out_samples + s->coff[fr];
2481 if(m->nb_channels == 1) {
2482 for(j = 0; j < n; j++) {
2483 *bp = decoded_buf[j];
2484 bp += avctx->channels;
2487 for(j = 0; j < n; j++) {
2488 bp[0] = decoded_buf[j++];
2489 bp[1] = decoded_buf[j];
2490 bp += avctx->channels;
2494 avctx->bit_rate += m->bit_rate;
2497 /* update codec info */
2498 avctx->sample_rate = s->mp3decctx[0]->sample_rate;
2500 *data_size = out_size;
2503 #endif /* CONFIG_MP3ON4_DECODER */
2506 #if CONFIG_MP1_DECODER
2507 AVCodec mp1_decoder =
2512 sizeof(MPADecodeContext),
2517 CODEC_CAP_PARSE_ONLY,
2519 .long_name= NULL_IF_CONFIG_SMALL("MP1 (MPEG audio layer 1)"),
2522 #if CONFIG_MP2_DECODER
2523 AVCodec mp2_decoder =
2528 sizeof(MPADecodeContext),
2533 CODEC_CAP_PARSE_ONLY,
2535 .long_name= NULL_IF_CONFIG_SMALL("MP2 (MPEG audio layer 2)"),
2538 #if CONFIG_MP3_DECODER
2539 AVCodec mp3_decoder =
2544 sizeof(MPADecodeContext),
2549 CODEC_CAP_PARSE_ONLY,
2551 .long_name= NULL_IF_CONFIG_SMALL("MP3 (MPEG audio layer 3)"),
2554 #if CONFIG_MP3ADU_DECODER
2555 AVCodec mp3adu_decoder =
2560 sizeof(MPADecodeContext),
2565 CODEC_CAP_PARSE_ONLY,
2567 .long_name= NULL_IF_CONFIG_SMALL("ADU (Application Data Unit) MP3 (MPEG audio layer 3)"),
2570 #if CONFIG_MP3ON4_DECODER
2571 AVCodec mp3on4_decoder =
2576 sizeof(MP3On4DecodeContext),
2579 decode_close_mp3on4,
2580 decode_frame_mp3on4,
2582 .long_name= NULL_IF_CONFIG_SMALL("MP3onMP4"),