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))
60 * Context for MP3On4 decoder
62 typedef struct MP3On4DecodeContext {
63 int frames; ///< number of mp3 frames per block (number of mp3 decoder instances)
64 int chan_cfg; ///< channel config number
65 MPADecodeContext *mp3decctx[5]; ///< MPADecodeContext for every decoder instance
66 } MP3On4DecodeContext;
68 /* layer 3 "granule" */
69 typedef struct GranuleDef {
74 int scalefac_compress;
79 uint8_t scalefac_scale;
80 uint8_t count1table_select;
81 int region_size[3]; /* number of huffman codes in each region */
83 int short_start, long_end; /* long/short band indexes */
84 uint8_t scale_factors[40];
85 int32_t sb_hybrid[SBLIMIT * 18]; /* 576 samples */
88 #define MODE_EXT_MS_STEREO 2
89 #define MODE_EXT_I_STEREO 1
91 #include "mpegaudiodata.h"
92 #include "mpegaudiodectab.h"
94 static void compute_antialias_integer(MPADecodeContext *s, GranuleDef *g);
95 static void compute_antialias_float(MPADecodeContext *s, GranuleDef *g);
97 /* vlc structure for decoding layer 3 huffman tables */
98 static VLC huff_vlc[16];
99 static VLC huff_quad_vlc[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]);
132 /* layer 1 unscaling */
133 /* n = number of bits of the mantissa minus 1 */
134 static inline int l1_unscale(int n, int mant, int scale_factor)
139 shift = scale_factor_modshift[scale_factor];
142 val = MUL64(mant + (-1 << n) + 1, scale_factor_mult[n-1][mod]);
144 /* NOTE: at this point, 1 <= shift >= 21 + 15 */
145 return (int)((val + (1LL << (shift - 1))) >> shift);
148 static inline int l2_unscale_group(int steps, int mant, int scale_factor)
152 shift = scale_factor_modshift[scale_factor];
156 val = (mant - (steps >> 1)) * scale_factor_mult2[steps >> 2][mod];
157 /* NOTE: at this point, 0 <= shift <= 21 */
159 val = (val + (1 << (shift - 1))) >> shift;
163 /* compute value^(4/3) * 2^(exponent/4). It normalized to FRAC_BITS */
164 static inline int l3_unscale(int value, int exponent)
169 e = table_4_3_exp [4*value + (exponent&3)];
170 m = table_4_3_value[4*value + (exponent&3)];
171 e -= (exponent >> 2);
175 m = (m + (1 << (e-1))) >> e;
180 /* all integer n^(4/3) computation code */
183 #define POW_FRAC_BITS 24
184 #define POW_FRAC_ONE (1 << POW_FRAC_BITS)
185 #define POW_FIX(a) ((int)((a) * POW_FRAC_ONE))
186 #define POW_MULL(a,b) (((int64_t)(a) * (int64_t)(b)) >> POW_FRAC_BITS)
188 static int dev_4_3_coefs[DEV_ORDER];
191 static int pow_mult3[3] = {
193 POW_FIX(1.25992104989487316476),
194 POW_FIX(1.58740105196819947474),
198 static void int_pow_init(void)
203 for(i=0;i<DEV_ORDER;i++) {
204 a = POW_MULL(a, POW_FIX(4.0 / 3.0) - i * POW_FIX(1.0)) / (i + 1);
205 dev_4_3_coefs[i] = a;
209 #if 0 /* unused, remove? */
210 /* return the mantissa and the binary exponent */
211 static int int_pow(int i, int *exp_ptr)
219 while (a < (1 << (POW_FRAC_BITS - 1))) {
223 a -= (1 << POW_FRAC_BITS);
225 for(j = DEV_ORDER - 1; j >= 0; j--)
226 a1 = POW_MULL(a, dev_4_3_coefs[j] + a1);
227 a = (1 << POW_FRAC_BITS) + a1;
228 /* exponent compute (exact) */
232 a = POW_MULL(a, pow_mult3[er]);
233 while (a >= 2 * POW_FRAC_ONE) {
237 /* convert to float */
238 while (a < POW_FRAC_ONE) {
242 /* now POW_FRAC_ONE <= a < 2 * POW_FRAC_ONE */
243 #if POW_FRAC_BITS > FRAC_BITS
244 a = (a + (1 << (POW_FRAC_BITS - FRAC_BITS - 1))) >> (POW_FRAC_BITS - FRAC_BITS);
245 /* correct overflow */
246 if (a >= 2 * (1 << FRAC_BITS)) {
256 static int decode_init(AVCodecContext * avctx)
258 MPADecodeContext *s = avctx->priv_data;
264 #if defined(USE_HIGHPRECISION) && defined(CONFIG_AUDIO_NONSHORT)
265 avctx->sample_fmt= SAMPLE_FMT_S32;
267 avctx->sample_fmt= SAMPLE_FMT_S16;
269 s->error_resilience= avctx->error_resilience;
271 if(avctx->antialias_algo != FF_AA_FLOAT)
272 s->compute_antialias= compute_antialias_integer;
274 s->compute_antialias= compute_antialias_float;
276 if (!init && !avctx->parse_only) {
277 /* scale factors table for layer 1/2 */
280 /* 1.0 (i = 3) is normalized to 2 ^ FRAC_BITS */
283 scale_factor_modshift[i] = mod | (shift << 2);
286 /* scale factor multiply for layer 1 */
290 norm = ((INT64_C(1) << n) * FRAC_ONE) / ((1 << n) - 1);
291 scale_factor_mult[i][0] = MULL(FIXR(1.0 * 2.0), norm);
292 scale_factor_mult[i][1] = MULL(FIXR(0.7937005259 * 2.0), norm);
293 scale_factor_mult[i][2] = MULL(FIXR(0.6299605249 * 2.0), norm);
294 dprintf(avctx, "%d: norm=%x s=%x %x %x\n",
296 scale_factor_mult[i][0],
297 scale_factor_mult[i][1],
298 scale_factor_mult[i][2]);
301 ff_mpa_synth_init(window);
303 /* huffman decode tables */
305 const HuffTable *h = &mpa_huff_tables[i];
308 uint8_t tmp_bits [512];
309 uint16_t tmp_codes[512];
311 memset(tmp_bits , 0, sizeof(tmp_bits ));
312 memset(tmp_codes, 0, sizeof(tmp_codes));
318 for(x=0;x<xsize;x++) {
319 for(y=0;y<xsize;y++){
320 tmp_bits [(x << 5) | y | ((x&&y)<<4)]= h->bits [j ];
321 tmp_codes[(x << 5) | y | ((x&&y)<<4)]= h->codes[j++];
326 init_vlc(&huff_vlc[i], 7, 512,
327 tmp_bits, 1, 1, tmp_codes, 2, 2, 1);
330 init_vlc(&huff_quad_vlc[i], i == 0 ? 7 : 4, 16,
331 mpa_quad_bits[i], 1, 1, mpa_quad_codes[i], 1, 1, 1);
337 band_index_long[i][j] = k;
338 k += band_size_long[i][j];
340 band_index_long[i][22] = k;
343 /* compute n ^ (4/3) and store it in mantissa/exp format */
346 for(i=1;i<TABLE_4_3_SIZE;i++) {
349 f = pow((double)(i/4), 4.0 / 3.0) * pow(2, (i&3)*0.25);
351 m = (uint32_t)(fm*(1LL<<31) + 0.5);
352 e+= FRAC_BITS - 31 + 5 - 100;
354 /* normalized to FRAC_BITS */
355 table_4_3_value[i] = m;
356 // av_log(NULL, AV_LOG_DEBUG, "%d %d %f\n", i, m, pow((double)i, 4.0 / 3.0));
357 table_4_3_exp[i] = -e;
359 for(i=0; i<512*16; i++){
360 int exponent= (i>>4);
361 double f= pow(i&15, 4.0 / 3.0) * pow(2, (exponent-400)*0.25 + FRAC_BITS + 5);
362 expval_table[exponent][i&15]= llrint(f);
364 exp_table[exponent]= llrint(f);
371 f = tan((double)i * M_PI / 12.0);
372 v = FIXR(f / (1.0 + f));
377 is_table[1][6 - i] = v;
381 is_table[0][i] = is_table[1][i] = 0.0;
388 e = -(j + 1) * ((i + 1) >> 1);
389 f = pow(2.0, e / 4.0);
391 is_table_lsf[j][k ^ 1][i] = FIXR(f);
392 is_table_lsf[j][k][i] = FIXR(1.0);
393 dprintf(avctx, "is_table_lsf %d %d: %x %x\n",
394 i, j, is_table_lsf[j][0][i], is_table_lsf[j][1][i]);
401 cs = 1.0 / sqrt(1.0 + ci * ci);
403 csa_table[i][0] = FIXHR(cs/4);
404 csa_table[i][1] = FIXHR(ca/4);
405 csa_table[i][2] = FIXHR(ca/4) + FIXHR(cs/4);
406 csa_table[i][3] = FIXHR(ca/4) - FIXHR(cs/4);
407 csa_table_float[i][0] = cs;
408 csa_table_float[i][1] = ca;
409 csa_table_float[i][2] = ca + cs;
410 csa_table_float[i][3] = ca - cs;
411 // printf("%d %d %d %d\n", FIX(cs), FIX(cs-1), FIX(ca), FIX(cs)-FIX(ca));
412 // av_log(NULL, AV_LOG_DEBUG,"%f %f %f %f\n", cs, ca, ca+cs, ca-cs);
415 /* compute mdct windows */
423 d= sin(M_PI * (i + 0.5) / 36.0);
426 else if(i>=24) d= sin(M_PI * (i - 18 + 0.5) / 12.0);
430 else if(i< 12) d= sin(M_PI * (i - 6 + 0.5) / 12.0);
433 //merge last stage of imdct into the window coefficients
434 d*= 0.5 / cos(M_PI*(2*i + 19)/72);
437 mdct_win[j][i/3] = FIXHR((d / (1<<5)));
439 mdct_win[j][i ] = FIXHR((d / (1<<5)));
440 // av_log(NULL, AV_LOG_DEBUG, "%2d %d %f\n", i,j,d / (1<<5));
444 /* NOTE: we do frequency inversion adter the MDCT by changing
445 the sign of the right window coefs */
448 mdct_win[j + 4][i] = mdct_win[j][i];
449 mdct_win[j + 4][i + 1] = -mdct_win[j][i + 1];
455 av_log(avctx, AV_LOG_DEBUG, "win%d=\n", j);
457 av_log(avctx, AV_LOG_DEBUG, "%f, ", (double)mdct_win[j][i] / FRAC_ONE);
458 av_log(avctx, AV_LOG_DEBUG, "\n");
467 if (avctx->codec_id == CODEC_ID_MP3ADU)
472 /* tab[i][j] = 1.0 / (2.0 * cos(pi*(2*k+1) / 2^(6 - j))) */
476 #define COS0_0 FIXHR(0.50060299823519630134/2)
477 #define COS0_1 FIXHR(0.50547095989754365998/2)
478 #define COS0_2 FIXHR(0.51544730992262454697/2)
479 #define COS0_3 FIXHR(0.53104259108978417447/2)
480 #define COS0_4 FIXHR(0.55310389603444452782/2)
481 #define COS0_5 FIXHR(0.58293496820613387367/2)
482 #define COS0_6 FIXHR(0.62250412303566481615/2)
483 #define COS0_7 FIXHR(0.67480834145500574602/2)
484 #define COS0_8 FIXHR(0.74453627100229844977/2)
485 #define COS0_9 FIXHR(0.83934964541552703873/2)
486 #define COS0_10 FIXHR(0.97256823786196069369/2)
487 #define COS0_11 FIXHR(1.16943993343288495515/4)
488 #define COS0_12 FIXHR(1.48416461631416627724/4)
489 #define COS0_13 FIXHR(2.05778100995341155085/8)
490 #define COS0_14 FIXHR(3.40760841846871878570/8)
491 #define COS0_15 FIXHR(10.19000812354805681150/32)
493 #define COS1_0 FIXHR(0.50241928618815570551/2)
494 #define COS1_1 FIXHR(0.52249861493968888062/2)
495 #define COS1_2 FIXHR(0.56694403481635770368/2)
496 #define COS1_3 FIXHR(0.64682178335999012954/2)
497 #define COS1_4 FIXHR(0.78815462345125022473/2)
498 #define COS1_5 FIXHR(1.06067768599034747134/4)
499 #define COS1_6 FIXHR(1.72244709823833392782/4)
500 #define COS1_7 FIXHR(5.10114861868916385802/16)
502 #define COS2_0 FIXHR(0.50979557910415916894/2)
503 #define COS2_1 FIXHR(0.60134488693504528054/2)
504 #define COS2_2 FIXHR(0.89997622313641570463/2)
505 #define COS2_3 FIXHR(2.56291544774150617881/8)
507 #define COS3_0 FIXHR(0.54119610014619698439/2)
508 #define COS3_1 FIXHR(1.30656296487637652785/4)
510 #define COS4_0 FIXHR(0.70710678118654752439/2)
512 /* butterfly operator */
513 #define BF(a, b, c, s)\
515 tmp0 = tab[a] + tab[b];\
516 tmp1 = tab[a] - tab[b];\
518 tab[b] = MULH(tmp1<<(s), c);\
521 #define BF1(a, b, c, d)\
523 BF(a, b, COS4_0, 1);\
524 BF(c, d,-COS4_0, 1);\
528 #define BF2(a, b, c, d)\
530 BF(a, b, COS4_0, 1);\
531 BF(c, d,-COS4_0, 1);\
538 #define ADD(a, b) tab[a] += tab[b]
540 /* DCT32 without 1/sqrt(2) coef zero scaling. */
541 static void dct32(int32_t *out, int32_t *tab)
546 BF( 0, 31, COS0_0 , 1);
547 BF(15, 16, COS0_15, 5);
549 BF( 0, 15, COS1_0 , 1);
550 BF(16, 31,-COS1_0 , 1);
552 BF( 7, 24, COS0_7 , 1);
553 BF( 8, 23, COS0_8 , 1);
555 BF( 7, 8, COS1_7 , 4);
556 BF(23, 24,-COS1_7 , 4);
558 BF( 0, 7, COS2_0 , 1);
559 BF( 8, 15,-COS2_0 , 1);
560 BF(16, 23, COS2_0 , 1);
561 BF(24, 31,-COS2_0 , 1);
563 BF( 3, 28, COS0_3 , 1);
564 BF(12, 19, COS0_12, 2);
566 BF( 3, 12, COS1_3 , 1);
567 BF(19, 28,-COS1_3 , 1);
569 BF( 4, 27, COS0_4 , 1);
570 BF(11, 20, COS0_11, 2);
572 BF( 4, 11, COS1_4 , 1);
573 BF(20, 27,-COS1_4 , 1);
575 BF( 3, 4, COS2_3 , 3);
576 BF(11, 12,-COS2_3 , 3);
577 BF(19, 20, COS2_3 , 3);
578 BF(27, 28,-COS2_3 , 3);
580 BF( 0, 3, COS3_0 , 1);
581 BF( 4, 7,-COS3_0 , 1);
582 BF( 8, 11, COS3_0 , 1);
583 BF(12, 15,-COS3_0 , 1);
584 BF(16, 19, COS3_0 , 1);
585 BF(20, 23,-COS3_0 , 1);
586 BF(24, 27, COS3_0 , 1);
587 BF(28, 31,-COS3_0 , 1);
592 BF( 1, 30, COS0_1 , 1);
593 BF(14, 17, COS0_14, 3);
595 BF( 1, 14, COS1_1 , 1);
596 BF(17, 30,-COS1_1 , 1);
598 BF( 6, 25, COS0_6 , 1);
599 BF( 9, 22, COS0_9 , 1);
601 BF( 6, 9, COS1_6 , 2);
602 BF(22, 25,-COS1_6 , 2);
604 BF( 1, 6, COS2_1 , 1);
605 BF( 9, 14,-COS2_1 , 1);
606 BF(17, 22, COS2_1 , 1);
607 BF(25, 30,-COS2_1 , 1);
610 BF( 2, 29, COS0_2 , 1);
611 BF(13, 18, COS0_13, 3);
613 BF( 2, 13, COS1_2 , 1);
614 BF(18, 29,-COS1_2 , 1);
616 BF( 5, 26, COS0_5 , 1);
617 BF(10, 21, COS0_10, 1);
619 BF( 5, 10, COS1_5 , 2);
620 BF(21, 26,-COS1_5 , 2);
622 BF( 2, 5, COS2_2 , 1);
623 BF(10, 13,-COS2_2 , 1);
624 BF(18, 21, COS2_2 , 1);
625 BF(26, 29,-COS2_2 , 1);
627 BF( 1, 2, COS3_1 , 2);
628 BF( 5, 6,-COS3_1 , 2);
629 BF( 9, 10, COS3_1 , 2);
630 BF(13, 14,-COS3_1 , 2);
631 BF(17, 18, COS3_1 , 2);
632 BF(21, 22,-COS3_1 , 2);
633 BF(25, 26, COS3_1 , 2);
634 BF(29, 30,-COS3_1 , 2);
681 out[ 1] = tab[16] + tab[24];
682 out[17] = tab[17] + tab[25];
683 out[ 9] = tab[18] + tab[26];
684 out[25] = tab[19] + tab[27];
685 out[ 5] = tab[20] + tab[28];
686 out[21] = tab[21] + tab[29];
687 out[13] = tab[22] + tab[30];
688 out[29] = tab[23] + tab[31];
689 out[ 3] = tab[24] + tab[20];
690 out[19] = tab[25] + tab[21];
691 out[11] = tab[26] + tab[22];
692 out[27] = tab[27] + tab[23];
693 out[ 7] = tab[28] + tab[18];
694 out[23] = tab[29] + tab[19];
695 out[15] = tab[30] + tab[17];
701 static inline int round_sample(int *sum)
704 sum1 = (*sum) >> OUT_SHIFT;
705 *sum &= (1<<OUT_SHIFT)-1;
708 else if (sum1 > OUT_MAX)
713 /* signed 16x16 -> 32 multiply add accumulate */
714 #define MACS(rt, ra, rb) MAC16(rt, ra, rb)
716 /* signed 16x16 -> 32 multiply */
717 #define MULS(ra, rb) MUL16(ra, rb)
721 static inline int round_sample(int64_t *sum)
724 sum1 = (int)((*sum) >> OUT_SHIFT);
725 *sum &= (1<<OUT_SHIFT)-1;
728 else if (sum1 > OUT_MAX)
733 # define MULS(ra, rb) MUL64(ra, rb)
736 #define SUM8(sum, op, w, p) \
738 sum op MULS((w)[0 * 64], p[0 * 64]);\
739 sum op MULS((w)[1 * 64], p[1 * 64]);\
740 sum op MULS((w)[2 * 64], p[2 * 64]);\
741 sum op MULS((w)[3 * 64], p[3 * 64]);\
742 sum op MULS((w)[4 * 64], p[4 * 64]);\
743 sum op MULS((w)[5 * 64], p[5 * 64]);\
744 sum op MULS((w)[6 * 64], p[6 * 64]);\
745 sum op MULS((w)[7 * 64], p[7 * 64]);\
748 #define SUM8P2(sum1, op1, sum2, op2, w1, w2, p) \
752 sum1 op1 MULS((w1)[0 * 64], tmp);\
753 sum2 op2 MULS((w2)[0 * 64], tmp);\
755 sum1 op1 MULS((w1)[1 * 64], tmp);\
756 sum2 op2 MULS((w2)[1 * 64], tmp);\
758 sum1 op1 MULS((w1)[2 * 64], tmp);\
759 sum2 op2 MULS((w2)[2 * 64], tmp);\
761 sum1 op1 MULS((w1)[3 * 64], tmp);\
762 sum2 op2 MULS((w2)[3 * 64], tmp);\
764 sum1 op1 MULS((w1)[4 * 64], tmp);\
765 sum2 op2 MULS((w2)[4 * 64], tmp);\
767 sum1 op1 MULS((w1)[5 * 64], tmp);\
768 sum2 op2 MULS((w2)[5 * 64], tmp);\
770 sum1 op1 MULS((w1)[6 * 64], tmp);\
771 sum2 op2 MULS((w2)[6 * 64], tmp);\
773 sum1 op1 MULS((w1)[7 * 64], tmp);\
774 sum2 op2 MULS((w2)[7 * 64], tmp);\
777 void ff_mpa_synth_init(MPA_INT *window)
781 /* max = 18760, max sum over all 16 coefs : 44736 */
784 v = ff_mpa_enwindow[i];
786 v = (v + (1 << (16 - WFRAC_BITS - 1))) >> (16 - WFRAC_BITS);
796 /* 32 sub band synthesis filter. Input: 32 sub band samples, Output:
798 /* XXX: optimize by avoiding ring buffer usage */
799 void ff_mpa_synth_filter(MPA_INT *synth_buf_ptr, int *synth_buf_offset,
800 MPA_INT *window, int *dither_state,
801 OUT_INT *samples, int incr,
802 int32_t sb_samples[SBLIMIT])
805 register MPA_INT *synth_buf;
806 register const MPA_INT *w, *w2, *p;
815 dct32(tmp, sb_samples);
817 offset = *synth_buf_offset;
818 synth_buf = synth_buf_ptr + offset;
823 /* NOTE: can cause a loss in precision if very high amplitude
825 v = av_clip_int16(v);
829 /* copy to avoid wrap */
830 memcpy(synth_buf + 512, synth_buf, 32 * sizeof(MPA_INT));
832 samples2 = samples + 31 * incr;
840 SUM8(sum, -=, w + 32, p);
841 *samples = round_sample(&sum);
845 /* we calculate two samples at the same time to avoid one memory
846 access per two sample */
849 p = synth_buf + 16 + j;
850 SUM8P2(sum, +=, sum2, -=, w, w2, p);
851 p = synth_buf + 48 - j;
852 SUM8P2(sum, -=, sum2, -=, w + 32, w2 + 32, p);
854 *samples = round_sample(&sum);
857 *samples2 = round_sample(&sum);
864 SUM8(sum, -=, w + 32, p);
865 *samples = round_sample(&sum);
868 offset = (offset - 32) & 511;
869 *synth_buf_offset = offset;
872 #define C3 FIXHR(0.86602540378443864676/2)
874 /* 0.5 / cos(pi*(2*i+1)/36) */
875 static const int icos36[9] = {
876 FIXR(0.50190991877167369479),
877 FIXR(0.51763809020504152469), //0
878 FIXR(0.55168895948124587824),
879 FIXR(0.61038729438072803416),
880 FIXR(0.70710678118654752439), //1
881 FIXR(0.87172339781054900991),
882 FIXR(1.18310079157624925896),
883 FIXR(1.93185165257813657349), //2
884 FIXR(5.73685662283492756461),
887 /* 0.5 / cos(pi*(2*i+1)/36) */
888 static const int icos36h[9] = {
889 FIXHR(0.50190991877167369479/2),
890 FIXHR(0.51763809020504152469/2), //0
891 FIXHR(0.55168895948124587824/2),
892 FIXHR(0.61038729438072803416/2),
893 FIXHR(0.70710678118654752439/2), //1
894 FIXHR(0.87172339781054900991/2),
895 FIXHR(1.18310079157624925896/4),
896 FIXHR(1.93185165257813657349/4), //2
897 // FIXHR(5.73685662283492756461),
900 /* 12 points IMDCT. We compute it "by hand" by factorizing obvious
902 static void imdct12(int *out, int *in)
904 int in0, in1, in2, in3, in4, in5, t1, t2;
907 in1= in[1*3] + in[0*3];
908 in2= in[2*3] + in[1*3];
909 in3= in[3*3] + in[2*3];
910 in4= in[4*3] + in[3*3];
911 in5= in[5*3] + in[4*3];
915 in2= MULH(2*in2, C3);
916 in3= MULH(4*in3, C3);
919 t2 = MULH(2*(in1 - in5), icos36h[4]);
929 in1 = MULH(in5 + in3, icos36h[1]);
936 in5 = MULH(2*(in5 - in3), icos36h[7]);
944 #define C1 FIXHR(0.98480775301220805936/2)
945 #define C2 FIXHR(0.93969262078590838405/2)
946 #define C3 FIXHR(0.86602540378443864676/2)
947 #define C4 FIXHR(0.76604444311897803520/2)
948 #define C5 FIXHR(0.64278760968653932632/2)
949 #define C6 FIXHR(0.5/2)
950 #define C7 FIXHR(0.34202014332566873304/2)
951 #define C8 FIXHR(0.17364817766693034885/2)
954 /* using Lee like decomposition followed by hand coded 9 points DCT */
955 static void imdct36(int *out, int *buf, int *in, int *win)
957 int i, j, t0, t1, t2, t3, s0, s1, s2, s3;
958 int tmp[18], *tmp1, *in1;
969 //more accurate but slower
970 int64_t t0, t1, t2, t3;
971 t2 = in1[2*4] + in1[2*8] - in1[2*2];
973 t3 = (in1[2*0] + (int64_t)(in1[2*6]>>1))<<32;
974 t1 = in1[2*0] - in1[2*6];
975 tmp1[ 6] = t1 - (t2>>1);
978 t0 = MUL64(2*(in1[2*2] + in1[2*4]), C2);
979 t1 = MUL64( in1[2*4] - in1[2*8] , -2*C8);
980 t2 = MUL64(2*(in1[2*2] + in1[2*8]), -C4);
982 tmp1[10] = (t3 - t0 - t2) >> 32;
983 tmp1[ 2] = (t3 + t0 + t1) >> 32;
984 tmp1[14] = (t3 + t2 - t1) >> 32;
986 tmp1[ 4] = MULH(2*(in1[2*5] + in1[2*7] - in1[2*1]), -C3);
987 t2 = MUL64(2*(in1[2*1] + in1[2*5]), C1);
988 t3 = MUL64( in1[2*5] - in1[2*7] , -2*C7);
989 t0 = MUL64(2*in1[2*3], C3);
991 t1 = MUL64(2*(in1[2*1] + in1[2*7]), -C5);
993 tmp1[ 0] = (t2 + t3 + t0) >> 32;
994 tmp1[12] = (t2 + t1 - t0) >> 32;
995 tmp1[ 8] = (t3 - t1 - t0) >> 32;
997 t2 = in1[2*4] + in1[2*8] - in1[2*2];
999 t3 = in1[2*0] + (in1[2*6]>>1);
1000 t1 = in1[2*0] - in1[2*6];
1001 tmp1[ 6] = t1 - (t2>>1);
1004 t0 = MULH(2*(in1[2*2] + in1[2*4]), C2);
1005 t1 = MULH( in1[2*4] - in1[2*8] , -2*C8);
1006 t2 = MULH(2*(in1[2*2] + in1[2*8]), -C4);
1008 tmp1[10] = t3 - t0 - t2;
1009 tmp1[ 2] = t3 + t0 + t1;
1010 tmp1[14] = t3 + t2 - t1;
1012 tmp1[ 4] = MULH(2*(in1[2*5] + in1[2*7] - in1[2*1]), -C3);
1013 t2 = MULH(2*(in1[2*1] + in1[2*5]), C1);
1014 t3 = MULH( in1[2*5] - in1[2*7] , -2*C7);
1015 t0 = MULH(2*in1[2*3], C3);
1017 t1 = MULH(2*(in1[2*1] + in1[2*7]), -C5);
1019 tmp1[ 0] = t2 + t3 + t0;
1020 tmp1[12] = t2 + t1 - t0;
1021 tmp1[ 8] = t3 - t1 - t0;
1034 s1 = MULH(2*(t3 + t2), icos36h[j]);
1035 s3 = MULL(t3 - t2, icos36[8 - j]);
1039 out[(9 + j)*SBLIMIT] = MULH(t1, win[9 + j]) + buf[9 + j];
1040 out[(8 - j)*SBLIMIT] = MULH(t1, win[8 - j]) + buf[8 - j];
1041 buf[9 + j] = MULH(t0, win[18 + 9 + j]);
1042 buf[8 - j] = MULH(t0, win[18 + 8 - j]);
1046 out[(9 + 8 - j)*SBLIMIT] = MULH(t1, win[9 + 8 - j]) + buf[9 + 8 - j];
1047 out[( j)*SBLIMIT] = MULH(t1, win[ j]) + buf[ j];
1048 buf[9 + 8 - j] = MULH(t0, win[18 + 9 + 8 - j]);
1049 buf[ + j] = MULH(t0, win[18 + j]);
1054 s1 = MULH(2*tmp[17], icos36h[4]);
1057 out[(9 + 4)*SBLIMIT] = MULH(t1, win[9 + 4]) + buf[9 + 4];
1058 out[(8 - 4)*SBLIMIT] = MULH(t1, win[8 - 4]) + buf[8 - 4];
1059 buf[9 + 4] = MULH(t0, win[18 + 9 + 4]);
1060 buf[8 - 4] = MULH(t0, win[18 + 8 - 4]);
1063 /* return the number of decoded frames */
1064 static int mp_decode_layer1(MPADecodeContext *s)
1066 int bound, i, v, n, ch, j, mant;
1067 uint8_t allocation[MPA_MAX_CHANNELS][SBLIMIT];
1068 uint8_t scale_factors[MPA_MAX_CHANNELS][SBLIMIT];
1070 if (s->mode == MPA_JSTEREO)
1071 bound = (s->mode_ext + 1) * 4;
1075 /* allocation bits */
1076 for(i=0;i<bound;i++) {
1077 for(ch=0;ch<s->nb_channels;ch++) {
1078 allocation[ch][i] = get_bits(&s->gb, 4);
1081 for(i=bound;i<SBLIMIT;i++) {
1082 allocation[0][i] = get_bits(&s->gb, 4);
1086 for(i=0;i<bound;i++) {
1087 for(ch=0;ch<s->nb_channels;ch++) {
1088 if (allocation[ch][i])
1089 scale_factors[ch][i] = get_bits(&s->gb, 6);
1092 for(i=bound;i<SBLIMIT;i++) {
1093 if (allocation[0][i]) {
1094 scale_factors[0][i] = get_bits(&s->gb, 6);
1095 scale_factors[1][i] = get_bits(&s->gb, 6);
1099 /* compute samples */
1101 for(i=0;i<bound;i++) {
1102 for(ch=0;ch<s->nb_channels;ch++) {
1103 n = allocation[ch][i];
1105 mant = get_bits(&s->gb, n + 1);
1106 v = l1_unscale(n, mant, scale_factors[ch][i]);
1110 s->sb_samples[ch][j][i] = v;
1113 for(i=bound;i<SBLIMIT;i++) {
1114 n = allocation[0][i];
1116 mant = get_bits(&s->gb, n + 1);
1117 v = l1_unscale(n, mant, scale_factors[0][i]);
1118 s->sb_samples[0][j][i] = v;
1119 v = l1_unscale(n, mant, scale_factors[1][i]);
1120 s->sb_samples[1][j][i] = v;
1122 s->sb_samples[0][j][i] = 0;
1123 s->sb_samples[1][j][i] = 0;
1130 static int mp_decode_layer2(MPADecodeContext *s)
1132 int sblimit; /* number of used subbands */
1133 const unsigned char *alloc_table;
1134 int table, bit_alloc_bits, i, j, ch, bound, v;
1135 unsigned char bit_alloc[MPA_MAX_CHANNELS][SBLIMIT];
1136 unsigned char scale_code[MPA_MAX_CHANNELS][SBLIMIT];
1137 unsigned char scale_factors[MPA_MAX_CHANNELS][SBLIMIT][3], *sf;
1138 int scale, qindex, bits, steps, k, l, m, b;
1140 /* select decoding table */
1141 table = ff_mpa_l2_select_table(s->bit_rate / 1000, s->nb_channels,
1142 s->sample_rate, s->lsf);
1143 sblimit = ff_mpa_sblimit_table[table];
1144 alloc_table = ff_mpa_alloc_tables[table];
1146 if (s->mode == MPA_JSTEREO)
1147 bound = (s->mode_ext + 1) * 4;
1151 dprintf(s->avctx, "bound=%d sblimit=%d\n", bound, sblimit);
1154 if( bound > sblimit ) bound = sblimit;
1156 /* parse bit allocation */
1158 for(i=0;i<bound;i++) {
1159 bit_alloc_bits = alloc_table[j];
1160 for(ch=0;ch<s->nb_channels;ch++) {
1161 bit_alloc[ch][i] = get_bits(&s->gb, bit_alloc_bits);
1163 j += 1 << bit_alloc_bits;
1165 for(i=bound;i<sblimit;i++) {
1166 bit_alloc_bits = alloc_table[j];
1167 v = get_bits(&s->gb, bit_alloc_bits);
1168 bit_alloc[0][i] = v;
1169 bit_alloc[1][i] = v;
1170 j += 1 << bit_alloc_bits;
1175 for(ch=0;ch<s->nb_channels;ch++) {
1176 for(i=0;i<sblimit;i++)
1177 dprintf(s->avctx, " %d", bit_alloc[ch][i]);
1178 dprintf(s->avctx, "\n");
1184 for(i=0;i<sblimit;i++) {
1185 for(ch=0;ch<s->nb_channels;ch++) {
1186 if (bit_alloc[ch][i])
1187 scale_code[ch][i] = get_bits(&s->gb, 2);
1192 for(i=0;i<sblimit;i++) {
1193 for(ch=0;ch<s->nb_channels;ch++) {
1194 if (bit_alloc[ch][i]) {
1195 sf = scale_factors[ch][i];
1196 switch(scale_code[ch][i]) {
1199 sf[0] = get_bits(&s->gb, 6);
1200 sf[1] = get_bits(&s->gb, 6);
1201 sf[2] = get_bits(&s->gb, 6);
1204 sf[0] = get_bits(&s->gb, 6);
1209 sf[0] = get_bits(&s->gb, 6);
1210 sf[2] = get_bits(&s->gb, 6);
1214 sf[0] = get_bits(&s->gb, 6);
1215 sf[2] = get_bits(&s->gb, 6);
1224 for(ch=0;ch<s->nb_channels;ch++) {
1225 for(i=0;i<sblimit;i++) {
1226 if (bit_alloc[ch][i]) {
1227 sf = scale_factors[ch][i];
1228 dprintf(s->avctx, " %d %d %d", sf[0], sf[1], sf[2]);
1230 dprintf(s->avctx, " -");
1233 dprintf(s->avctx, "\n");
1239 for(l=0;l<12;l+=3) {
1241 for(i=0;i<bound;i++) {
1242 bit_alloc_bits = alloc_table[j];
1243 for(ch=0;ch<s->nb_channels;ch++) {
1244 b = bit_alloc[ch][i];
1246 scale = scale_factors[ch][i][k];
1247 qindex = alloc_table[j+b];
1248 bits = ff_mpa_quant_bits[qindex];
1250 /* 3 values at the same time */
1251 v = get_bits(&s->gb, -bits);
1252 steps = ff_mpa_quant_steps[qindex];
1253 s->sb_samples[ch][k * 12 + l + 0][i] =
1254 l2_unscale_group(steps, v % steps, scale);
1256 s->sb_samples[ch][k * 12 + l + 1][i] =
1257 l2_unscale_group(steps, v % steps, scale);
1259 s->sb_samples[ch][k * 12 + l + 2][i] =
1260 l2_unscale_group(steps, v, scale);
1263 v = get_bits(&s->gb, bits);
1264 v = l1_unscale(bits - 1, v, scale);
1265 s->sb_samples[ch][k * 12 + l + m][i] = v;
1269 s->sb_samples[ch][k * 12 + l + 0][i] = 0;
1270 s->sb_samples[ch][k * 12 + l + 1][i] = 0;
1271 s->sb_samples[ch][k * 12 + l + 2][i] = 0;
1274 /* next subband in alloc table */
1275 j += 1 << bit_alloc_bits;
1277 /* XXX: find a way to avoid this duplication of code */
1278 for(i=bound;i<sblimit;i++) {
1279 bit_alloc_bits = alloc_table[j];
1280 b = bit_alloc[0][i];
1282 int mant, scale0, scale1;
1283 scale0 = scale_factors[0][i][k];
1284 scale1 = scale_factors[1][i][k];
1285 qindex = alloc_table[j+b];
1286 bits = ff_mpa_quant_bits[qindex];
1288 /* 3 values at the same time */
1289 v = get_bits(&s->gb, -bits);
1290 steps = ff_mpa_quant_steps[qindex];
1293 s->sb_samples[0][k * 12 + l + 0][i] =
1294 l2_unscale_group(steps, mant, scale0);
1295 s->sb_samples[1][k * 12 + l + 0][i] =
1296 l2_unscale_group(steps, mant, scale1);
1299 s->sb_samples[0][k * 12 + l + 1][i] =
1300 l2_unscale_group(steps, mant, scale0);
1301 s->sb_samples[1][k * 12 + l + 1][i] =
1302 l2_unscale_group(steps, mant, scale1);
1303 s->sb_samples[0][k * 12 + l + 2][i] =
1304 l2_unscale_group(steps, v, scale0);
1305 s->sb_samples[1][k * 12 + l + 2][i] =
1306 l2_unscale_group(steps, v, scale1);
1309 mant = get_bits(&s->gb, bits);
1310 s->sb_samples[0][k * 12 + l + m][i] =
1311 l1_unscale(bits - 1, mant, scale0);
1312 s->sb_samples[1][k * 12 + l + m][i] =
1313 l1_unscale(bits - 1, mant, scale1);
1317 s->sb_samples[0][k * 12 + l + 0][i] = 0;
1318 s->sb_samples[0][k * 12 + l + 1][i] = 0;
1319 s->sb_samples[0][k * 12 + l + 2][i] = 0;
1320 s->sb_samples[1][k * 12 + l + 0][i] = 0;
1321 s->sb_samples[1][k * 12 + l + 1][i] = 0;
1322 s->sb_samples[1][k * 12 + l + 2][i] = 0;
1324 /* next subband in alloc table */
1325 j += 1 << bit_alloc_bits;
1327 /* fill remaining samples to zero */
1328 for(i=sblimit;i<SBLIMIT;i++) {
1329 for(ch=0;ch<s->nb_channels;ch++) {
1330 s->sb_samples[ch][k * 12 + l + 0][i] = 0;
1331 s->sb_samples[ch][k * 12 + l + 1][i] = 0;
1332 s->sb_samples[ch][k * 12 + l + 2][i] = 0;
1340 static inline void lsf_sf_expand(int *slen,
1341 int sf, int n1, int n2, int n3)
1360 static void exponents_from_scale_factors(MPADecodeContext *s,
1364 const uint8_t *bstab, *pretab;
1365 int len, i, j, k, l, v0, shift, gain, gains[3];
1368 exp_ptr = exponents;
1369 gain = g->global_gain - 210;
1370 shift = g->scalefac_scale + 1;
1372 bstab = band_size_long[s->sample_rate_index];
1373 pretab = mpa_pretab[g->preflag];
1374 for(i=0;i<g->long_end;i++) {
1375 v0 = gain - ((g->scale_factors[i] + pretab[i]) << shift) + 400;
1381 if (g->short_start < 13) {
1382 bstab = band_size_short[s->sample_rate_index];
1383 gains[0] = gain - (g->subblock_gain[0] << 3);
1384 gains[1] = gain - (g->subblock_gain[1] << 3);
1385 gains[2] = gain - (g->subblock_gain[2] << 3);
1387 for(i=g->short_start;i<13;i++) {
1390 v0 = gains[l] - (g->scale_factors[k++] << shift) + 400;
1398 /* handle n = 0 too */
1399 static inline int get_bitsz(GetBitContext *s, int n)
1404 return get_bits(s, n);
1408 static void switch_buffer(MPADecodeContext *s, int *pos, int *end_pos, int *end_pos2){
1409 if(s->in_gb.buffer && *pos >= s->gb.size_in_bits){
1411 s->in_gb.buffer=NULL;
1412 assert((get_bits_count(&s->gb) & 7) == 0);
1413 skip_bits_long(&s->gb, *pos - *end_pos);
1415 *end_pos= *end_pos2 + get_bits_count(&s->gb) - *pos;
1416 *pos= get_bits_count(&s->gb);
1420 static int huffman_decode(MPADecodeContext *s, GranuleDef *g,
1421 int16_t *exponents, int end_pos2)
1425 int last_pos, bits_left;
1427 int end_pos= FFMIN(end_pos2, s->gb.size_in_bits);
1429 /* low frequencies (called big values) */
1432 int j, k, l, linbits;
1433 j = g->region_size[i];
1436 /* select vlc table */
1437 k = g->table_select[i];
1438 l = mpa_huff_data[k][0];
1439 linbits = mpa_huff_data[k][1];
1443 memset(&g->sb_hybrid[s_index], 0, sizeof(*g->sb_hybrid)*2*j);
1448 /* read huffcode and compute each couple */
1450 int exponent, x, y, v;
1451 int pos= get_bits_count(&s->gb);
1453 if (pos >= end_pos){
1454 // av_log(NULL, AV_LOG_ERROR, "pos: %d %d %d %d\n", pos, end_pos, end_pos2, s_index);
1455 switch_buffer(s, &pos, &end_pos, &end_pos2);
1456 // av_log(NULL, AV_LOG_ERROR, "new pos: %d %d\n", pos, end_pos);
1460 y = get_vlc2(&s->gb, vlc->table, 7, 3);
1463 g->sb_hybrid[s_index ] =
1464 g->sb_hybrid[s_index+1] = 0;
1469 exponent= exponents[s_index];
1471 dprintf(s->avctx, "region=%d n=%d x=%d y=%d exp=%d\n",
1472 i, g->region_size[i] - j, x, y, exponent);
1477 v = expval_table[ exponent ][ x ];
1478 // v = expval_table[ (exponent&3) ][ x ] >> FFMIN(0 - (exponent>>2), 31);
1480 x += get_bitsz(&s->gb, linbits);
1481 v = l3_unscale(x, exponent);
1483 if (get_bits1(&s->gb))
1485 g->sb_hybrid[s_index] = v;
1487 v = expval_table[ exponent ][ y ];
1489 y += get_bitsz(&s->gb, linbits);
1490 v = l3_unscale(y, exponent);
1492 if (get_bits1(&s->gb))
1494 g->sb_hybrid[s_index+1] = v;
1500 v = expval_table[ exponent ][ x ];
1502 x += get_bitsz(&s->gb, linbits);
1503 v = l3_unscale(x, exponent);
1505 if (get_bits1(&s->gb))
1507 g->sb_hybrid[s_index+!!y] = v;
1508 g->sb_hybrid[s_index+ !y] = 0;
1514 /* high frequencies */
1515 vlc = &huff_quad_vlc[g->count1table_select];
1517 while (s_index <= 572) {
1519 pos = get_bits_count(&s->gb);
1520 if (pos >= end_pos) {
1521 if (pos > end_pos2 && last_pos){
1522 /* some encoders generate an incorrect size for this
1523 part. We must go back into the data */
1525 skip_bits_long(&s->gb, last_pos - pos);
1526 av_log(NULL, AV_LOG_INFO, "overread, skip %d enddists: %d %d\n", last_pos - pos, end_pos-pos, end_pos2-pos);
1527 if(s->error_resilience >= FF_ER_COMPLIANT)
1531 // av_log(NULL, AV_LOG_ERROR, "pos2: %d %d %d %d\n", pos, end_pos, end_pos2, s_index);
1532 switch_buffer(s, &pos, &end_pos, &end_pos2);
1533 // av_log(NULL, AV_LOG_ERROR, "new pos2: %d %d %d\n", pos, end_pos, s_index);
1539 code = get_vlc2(&s->gb, vlc->table, vlc->bits, 1);
1540 dprintf(s->avctx, "t=%d code=%d\n", g->count1table_select, code);
1541 g->sb_hybrid[s_index+0]=
1542 g->sb_hybrid[s_index+1]=
1543 g->sb_hybrid[s_index+2]=
1544 g->sb_hybrid[s_index+3]= 0;
1546 static const int idxtab[16]={3,3,2,2,1,1,1,1,0,0,0,0,0,0,0,0};
1548 int pos= s_index+idxtab[code];
1549 code ^= 8>>idxtab[code];
1550 v = exp_table[ exponents[pos] ];
1551 // v = exp_table[ (exponents[pos]&3) ] >> FFMIN(0 - (exponents[pos]>>2), 31);
1552 if(get_bits1(&s->gb))
1554 g->sb_hybrid[pos] = v;
1558 /* skip extension bits */
1559 bits_left = end_pos2 - get_bits_count(&s->gb);
1560 //av_log(NULL, AV_LOG_ERROR, "left:%d buf:%p\n", bits_left, s->in_gb.buffer);
1561 if (bits_left < 0/* || bits_left > 500*/) {
1562 av_log(NULL, AV_LOG_ERROR, "bits_left=%d\n", bits_left);
1564 }else if(bits_left > 0 && s->error_resilience >= FF_ER_AGGRESSIVE){
1565 av_log(NULL, AV_LOG_ERROR, "bits_left=%d\n", bits_left);
1568 memset(&g->sb_hybrid[s_index], 0, sizeof(*g->sb_hybrid)*(576 - s_index));
1569 skip_bits_long(&s->gb, bits_left);
1571 i= get_bits_count(&s->gb);
1572 switch_buffer(s, &i, &end_pos, &end_pos2);
1577 /* Reorder short blocks from bitstream order to interleaved order. It
1578 would be faster to do it in parsing, but the code would be far more
1580 static void reorder_block(MPADecodeContext *s, GranuleDef *g)
1583 int32_t *ptr, *dst, *ptr1;
1586 if (g->block_type != 2)
1589 if (g->switch_point) {
1590 if (s->sample_rate_index != 8) {
1591 ptr = g->sb_hybrid + 36;
1593 ptr = g->sb_hybrid + 48;
1599 for(i=g->short_start;i<13;i++) {
1600 len = band_size_short[s->sample_rate_index][i];
1603 for(j=len;j>0;j--) {
1604 *dst++ = ptr[0*len];
1605 *dst++ = ptr[1*len];
1606 *dst++ = ptr[2*len];
1610 memcpy(ptr1, tmp, len * 3 * sizeof(*ptr1));
1614 #define ISQRT2 FIXR(0.70710678118654752440)
1616 static void compute_stereo(MPADecodeContext *s,
1617 GranuleDef *g0, GranuleDef *g1)
1621 int sf_max, tmp0, tmp1, sf, len, non_zero_found;
1622 int32_t (*is_tab)[16];
1623 int32_t *tab0, *tab1;
1624 int non_zero_found_short[3];
1626 /* intensity stereo */
1627 if (s->mode_ext & MODE_EXT_I_STEREO) {
1632 is_tab = is_table_lsf[g1->scalefac_compress & 1];
1636 tab0 = g0->sb_hybrid + 576;
1637 tab1 = g1->sb_hybrid + 576;
1639 non_zero_found_short[0] = 0;
1640 non_zero_found_short[1] = 0;
1641 non_zero_found_short[2] = 0;
1642 k = (13 - g1->short_start) * 3 + g1->long_end - 3;
1643 for(i = 12;i >= g1->short_start;i--) {
1644 /* for last band, use previous scale factor */
1647 len = band_size_short[s->sample_rate_index][i];
1651 if (!non_zero_found_short[l]) {
1652 /* test if non zero band. if so, stop doing i-stereo */
1653 for(j=0;j<len;j++) {
1655 non_zero_found_short[l] = 1;
1659 sf = g1->scale_factors[k + l];
1665 for(j=0;j<len;j++) {
1667 tab0[j] = MULL(tmp0, v1);
1668 tab1[j] = MULL(tmp0, v2);
1672 if (s->mode_ext & MODE_EXT_MS_STEREO) {
1673 /* lower part of the spectrum : do ms stereo
1675 for(j=0;j<len;j++) {
1678 tab0[j] = MULL(tmp0 + tmp1, ISQRT2);
1679 tab1[j] = MULL(tmp0 - tmp1, ISQRT2);
1686 non_zero_found = non_zero_found_short[0] |
1687 non_zero_found_short[1] |
1688 non_zero_found_short[2];
1690 for(i = g1->long_end - 1;i >= 0;i--) {
1691 len = band_size_long[s->sample_rate_index][i];
1694 /* test if non zero band. if so, stop doing i-stereo */
1695 if (!non_zero_found) {
1696 for(j=0;j<len;j++) {
1702 /* for last band, use previous scale factor */
1703 k = (i == 21) ? 20 : i;
1704 sf = g1->scale_factors[k];
1709 for(j=0;j<len;j++) {
1711 tab0[j] = MULL(tmp0, v1);
1712 tab1[j] = MULL(tmp0, v2);
1716 if (s->mode_ext & MODE_EXT_MS_STEREO) {
1717 /* lower part of the spectrum : do ms stereo
1719 for(j=0;j<len;j++) {
1722 tab0[j] = MULL(tmp0 + tmp1, ISQRT2);
1723 tab1[j] = MULL(tmp0 - tmp1, ISQRT2);
1728 } else if (s->mode_ext & MODE_EXT_MS_STEREO) {
1729 /* ms stereo ONLY */
1730 /* NOTE: the 1/sqrt(2) normalization factor is included in the
1732 tab0 = g0->sb_hybrid;
1733 tab1 = g1->sb_hybrid;
1734 for(i=0;i<576;i++) {
1737 tab0[i] = tmp0 + tmp1;
1738 tab1[i] = tmp0 - tmp1;
1743 static void compute_antialias_integer(MPADecodeContext *s,
1749 /* we antialias only "long" bands */
1750 if (g->block_type == 2) {
1751 if (!g->switch_point)
1753 /* XXX: check this for 8000Hz case */
1759 ptr = g->sb_hybrid + 18;
1760 for(i = n;i > 0;i--) {
1761 int tmp0, tmp1, tmp2;
1762 csa = &csa_table[0][0];
1766 tmp2= MULH(tmp0 + tmp1, csa[0+4*j]);\
1767 ptr[-1-j] = 4*(tmp2 - MULH(tmp1, csa[2+4*j]));\
1768 ptr[ j] = 4*(tmp2 + MULH(tmp0, csa[3+4*j]));
1783 static void compute_antialias_float(MPADecodeContext *s,
1789 /* we antialias only "long" bands */
1790 if (g->block_type == 2) {
1791 if (!g->switch_point)
1793 /* XXX: check this for 8000Hz case */
1799 ptr = g->sb_hybrid + 18;
1800 for(i = n;i > 0;i--) {
1802 float *csa = &csa_table_float[0][0];
1803 #define FLOAT_AA(j)\
1806 ptr[-1-j] = lrintf(tmp0 * csa[0+4*j] - tmp1 * csa[1+4*j]);\
1807 ptr[ j] = lrintf(tmp0 * csa[1+4*j] + tmp1 * csa[0+4*j]);
1822 static void compute_imdct(MPADecodeContext *s,
1824 int32_t *sb_samples,
1827 int32_t *ptr, *win, *win1, *buf, *out_ptr, *ptr1;
1829 int i, j, mdct_long_end, v, sblimit;
1831 /* find last non zero block */
1832 ptr = g->sb_hybrid + 576;
1833 ptr1 = g->sb_hybrid + 2 * 18;
1834 while (ptr >= ptr1) {
1836 v = ptr[0] | ptr[1] | ptr[2] | ptr[3] | ptr[4] | ptr[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 = MULH(out2[i], win[i]) + buf[i + 6*1];
1881 buf[i + 6*2] = MULH(out2[i + 6], win[i + 6]);
1884 imdct12(out2, ptr + 1);
1886 *out_ptr = MULH(out2[i], win[i]) + buf[i + 6*2];
1887 buf[i + 6*0] = MULH(out2[i + 6], win[i + 6]);
1890 imdct12(out2, ptr + 2);
1892 buf[i + 6*0] = MULH(out2[i], win[i]) + buf[i + 6*0];
1893 buf[i + 6*1] = MULH(out2[i + 6], win[i + 6]);
1900 for(j=sblimit;j<SBLIMIT;j++) {
1902 out_ptr = sb_samples + j;
1913 void sample_dump(int fnum, int32_t *tab, int n)
1915 static FILE *files[16], *f;
1922 snprintf(buf, sizeof(buf), "/tmp/out%d.%s.pcm",
1924 #ifdef USE_HIGHPRECISION
1930 f = fopen(buf, "w");
1938 av_log(NULL, AV_LOG_DEBUG, "pos=%d\n", pos);
1940 av_log(NULL, AV_LOG_DEBUG, " %0.4f", (double)tab[i] / FRAC_ONE);
1942 av_log(NULL, AV_LOG_DEBUG, "\n");
1947 /* normalize to 23 frac bits */
1948 v = tab[i] << (23 - FRAC_BITS);
1949 fwrite(&v, 1, sizeof(int32_t), f);
1955 /* main layer3 decoding function */
1956 static int mp_decode_layer3(MPADecodeContext *s)
1958 int nb_granules, main_data_begin, private_bits;
1959 int gr, ch, blocksplit_flag, i, j, k, n, bits_pos;
1960 GranuleDef granules[2][2], *g;
1961 int16_t exponents[576];
1963 /* read side info */
1965 main_data_begin = get_bits(&s->gb, 8);
1966 private_bits = get_bits(&s->gb, s->nb_channels);
1969 main_data_begin = get_bits(&s->gb, 9);
1970 if (s->nb_channels == 2)
1971 private_bits = get_bits(&s->gb, 3);
1973 private_bits = get_bits(&s->gb, 5);
1975 for(ch=0;ch<s->nb_channels;ch++) {
1976 granules[ch][0].scfsi = 0; /* all scale factors are transmitted */
1977 granules[ch][1].scfsi = get_bits(&s->gb, 4);
1981 for(gr=0;gr<nb_granules;gr++) {
1982 for(ch=0;ch<s->nb_channels;ch++) {
1983 dprintf(s->avctx, "gr=%d ch=%d: side_info\n", gr, ch);
1984 g = &granules[ch][gr];
1985 g->part2_3_length = get_bits(&s->gb, 12);
1986 g->big_values = get_bits(&s->gb, 9);
1987 if(g->big_values > 288){
1988 av_log(s->avctx, AV_LOG_ERROR, "big_values too big\n");
1992 g->global_gain = get_bits(&s->gb, 8);
1993 /* if MS stereo only is selected, we precompute the
1994 1/sqrt(2) renormalization factor */
1995 if ((s->mode_ext & (MODE_EXT_MS_STEREO | MODE_EXT_I_STEREO)) ==
1997 g->global_gain -= 2;
1999 g->scalefac_compress = get_bits(&s->gb, 9);
2001 g->scalefac_compress = get_bits(&s->gb, 4);
2002 blocksplit_flag = get_bits1(&s->gb);
2003 if (blocksplit_flag) {
2004 g->block_type = get_bits(&s->gb, 2);
2005 if (g->block_type == 0){
2006 av_log(NULL, AV_LOG_ERROR, "invalid block type\n");
2009 g->switch_point = get_bits1(&s->gb);
2011 g->table_select[i] = get_bits(&s->gb, 5);
2013 g->subblock_gain[i] = get_bits(&s->gb, 3);
2014 /* compute huffman coded region sizes */
2015 if (g->block_type == 2)
2016 g->region_size[0] = (36 / 2);
2018 if (s->sample_rate_index <= 2)
2019 g->region_size[0] = (36 / 2);
2020 else if (s->sample_rate_index != 8)
2021 g->region_size[0] = (54 / 2);
2023 g->region_size[0] = (108 / 2);
2025 g->region_size[1] = (576 / 2);
2027 int region_address1, region_address2, l;
2029 g->switch_point = 0;
2031 g->table_select[i] = get_bits(&s->gb, 5);
2032 /* compute huffman coded region sizes */
2033 region_address1 = get_bits(&s->gb, 4);
2034 region_address2 = get_bits(&s->gb, 3);
2035 dprintf(s->avctx, "region1=%d region2=%d\n",
2036 region_address1, region_address2);
2038 band_index_long[s->sample_rate_index][region_address1 + 1] >> 1;
2039 l = region_address1 + region_address2 + 2;
2040 /* should not overflow */
2044 band_index_long[s->sample_rate_index][l] >> 1;
2046 /* convert region offsets to region sizes and truncate
2047 size to big_values */
2048 g->region_size[2] = (576 / 2);
2051 k = FFMIN(g->region_size[i], g->big_values);
2052 g->region_size[i] = k - j;
2056 /* compute band indexes */
2057 if (g->block_type == 2) {
2058 if (g->switch_point) {
2059 /* if switched mode, we handle the 36 first samples as
2060 long blocks. For 8000Hz, we handle the 48 first
2061 exponents as long blocks (XXX: check this!) */
2062 if (s->sample_rate_index <= 2)
2064 else if (s->sample_rate_index != 8)
2067 g->long_end = 4; /* 8000 Hz */
2069 g->short_start = 2 + (s->sample_rate_index != 8);
2075 g->short_start = 13;
2081 g->preflag = get_bits1(&s->gb);
2082 g->scalefac_scale = get_bits1(&s->gb);
2083 g->count1table_select = get_bits1(&s->gb);
2084 dprintf(s->avctx, "block_type=%d switch_point=%d\n",
2085 g->block_type, g->switch_point);
2090 const uint8_t *ptr = s->gb.buffer + (get_bits_count(&s->gb)>>3);
2091 assert((get_bits_count(&s->gb) & 7) == 0);
2092 /* now we get bits from the main_data_begin offset */
2093 dprintf(s->avctx, "seekback: %d\n", main_data_begin);
2094 //av_log(NULL, AV_LOG_ERROR, "backstep:%d, lastbuf:%d\n", main_data_begin, s->last_buf_size);
2096 memcpy(s->last_buf + s->last_buf_size, ptr, EXTRABYTES);
2098 init_get_bits(&s->gb, s->last_buf, s->last_buf_size*8);
2099 skip_bits_long(&s->gb, 8*(s->last_buf_size - main_data_begin));
2102 for(gr=0;gr<nb_granules;gr++) {
2103 for(ch=0;ch<s->nb_channels;ch++) {
2104 g = &granules[ch][gr];
2105 if(get_bits_count(&s->gb)<0){
2106 av_log(NULL, AV_LOG_ERROR, "mdb:%d, lastbuf:%d skipping granule %d\n",
2107 main_data_begin, s->last_buf_size, gr);
2108 skip_bits_long(&s->gb, g->part2_3_length);
2109 memset(g->sb_hybrid, 0, sizeof(g->sb_hybrid));
2110 if(get_bits_count(&s->gb) >= s->gb.size_in_bits && s->in_gb.buffer){
2111 skip_bits_long(&s->in_gb, get_bits_count(&s->gb) - s->gb.size_in_bits);
2113 s->in_gb.buffer=NULL;
2118 bits_pos = get_bits_count(&s->gb);
2122 int slen, slen1, slen2;
2124 /* MPEG1 scale factors */
2125 slen1 = slen_table[0][g->scalefac_compress];
2126 slen2 = slen_table[1][g->scalefac_compress];
2127 dprintf(s->avctx, "slen1=%d slen2=%d\n", slen1, slen2);
2128 if (g->block_type == 2) {
2129 n = g->switch_point ? 17 : 18;
2133 g->scale_factors[j++] = get_bits(&s->gb, slen1);
2136 g->scale_factors[j++] = 0;
2140 g->scale_factors[j++] = get_bits(&s->gb, slen2);
2142 g->scale_factors[j++] = 0;
2145 g->scale_factors[j++] = 0;
2148 sc = granules[ch][0].scale_factors;
2151 n = (k == 0 ? 6 : 5);
2152 if ((g->scfsi & (0x8 >> k)) == 0) {
2153 slen = (k < 2) ? slen1 : slen2;
2156 g->scale_factors[j++] = get_bits(&s->gb, slen);
2159 g->scale_factors[j++] = 0;
2162 /* simply copy from last granule */
2164 g->scale_factors[j] = sc[j];
2169 g->scale_factors[j++] = 0;
2173 dprintf(s->avctx, "scfsi=%x gr=%d ch=%d scale_factors:\n",
2176 dprintf(s->avctx, " %d", g->scale_factors[i]);
2177 dprintf(s->avctx, "\n");
2181 int tindex, tindex2, slen[4], sl, sf;
2183 /* LSF scale factors */
2184 if (g->block_type == 2) {
2185 tindex = g->switch_point ? 2 : 1;
2189 sf = g->scalefac_compress;
2190 if ((s->mode_ext & MODE_EXT_I_STEREO) && ch == 1) {
2191 /* intensity stereo case */
2194 lsf_sf_expand(slen, sf, 6, 6, 0);
2196 } else if (sf < 244) {
2197 lsf_sf_expand(slen, sf - 180, 4, 4, 0);
2200 lsf_sf_expand(slen, sf - 244, 3, 0, 0);
2206 lsf_sf_expand(slen, sf, 5, 4, 4);
2208 } else if (sf < 500) {
2209 lsf_sf_expand(slen, sf - 400, 5, 4, 0);
2212 lsf_sf_expand(slen, sf - 500, 3, 0, 0);
2220 n = lsf_nsf_table[tindex2][tindex][k];
2224 g->scale_factors[j++] = get_bits(&s->gb, sl);
2227 g->scale_factors[j++] = 0;
2230 /* XXX: should compute exact size */
2232 g->scale_factors[j] = 0;
2235 dprintf(s->avctx, "gr=%d ch=%d scale_factors:\n",
2238 dprintf(s->avctx, " %d", g->scale_factors[i]);
2239 dprintf(s->avctx, "\n");
2244 exponents_from_scale_factors(s, g, exponents);
2246 /* read Huffman coded residue */
2247 huffman_decode(s, g, exponents, bits_pos + g->part2_3_length);
2249 sample_dump(0, g->sb_hybrid, 576);
2253 if (s->nb_channels == 2)
2254 compute_stereo(s, &granules[0][gr], &granules[1][gr]);
2256 for(ch=0;ch<s->nb_channels;ch++) {
2257 g = &granules[ch][gr];
2259 reorder_block(s, g);
2261 sample_dump(0, g->sb_hybrid, 576);
2263 s->compute_antialias(s, g);
2265 sample_dump(1, g->sb_hybrid, 576);
2267 compute_imdct(s, g, &s->sb_samples[ch][18 * gr][0], s->mdct_buf[ch]);
2269 sample_dump(2, &s->sb_samples[ch][18 * gr][0], 576);
2273 if(get_bits_count(&s->gb)<0)
2274 skip_bits_long(&s->gb, -get_bits_count(&s->gb));
2275 return nb_granules * 18;
2278 static int mp_decode_frame(MPADecodeContext *s,
2279 OUT_INT *samples, const uint8_t *buf, int buf_size)
2281 int i, nb_frames, ch;
2282 OUT_INT *samples_ptr;
2284 init_get_bits(&s->gb, buf + HEADER_SIZE, (buf_size - HEADER_SIZE)*8);
2286 /* skip error protection field */
2287 if (s->error_protection)
2288 skip_bits(&s->gb, 16);
2290 dprintf(s->avctx, "frame %d:\n", s->frame_count);
2293 nb_frames = mp_decode_layer1(s);
2296 nb_frames = mp_decode_layer2(s);
2300 nb_frames = mp_decode_layer3(s);
2303 if(s->in_gb.buffer){
2304 align_get_bits(&s->gb);
2305 i= (s->gb.size_in_bits - get_bits_count(&s->gb))>>3;
2306 if(i >= 0 && i <= BACKSTEP_SIZE){
2307 memmove(s->last_buf, s->gb.buffer + (get_bits_count(&s->gb)>>3), i);
2310 av_log(NULL, AV_LOG_ERROR, "invalid old backstep %d\n", i);
2312 s->in_gb.buffer= NULL;
2315 align_get_bits(&s->gb);
2316 assert((get_bits_count(&s->gb) & 7) == 0);
2317 i= (s->gb.size_in_bits - get_bits_count(&s->gb))>>3;
2319 if(i<0 || i > BACKSTEP_SIZE || nb_frames<0){
2320 av_log(NULL, AV_LOG_ERROR, "invalid new backstep %d\n", i);
2321 i= FFMIN(BACKSTEP_SIZE, buf_size - HEADER_SIZE);
2323 assert(i <= buf_size - HEADER_SIZE && i>= 0);
2324 memcpy(s->last_buf + s->last_buf_size, s->gb.buffer + buf_size - HEADER_SIZE - i, i);
2325 s->last_buf_size += i;
2330 for(i=0;i<nb_frames;i++) {
2331 for(ch=0;ch<s->nb_channels;ch++) {
2333 dprintf(s->avctx, "%d-%d:", i, ch);
2334 for(j=0;j<SBLIMIT;j++)
2335 dprintf(s->avctx, " %0.6f", (double)s->sb_samples[ch][i][j] / FRAC_ONE);
2336 dprintf(s->avctx, "\n");
2340 /* apply the synthesis filter */
2341 for(ch=0;ch<s->nb_channels;ch++) {
2342 samples_ptr = samples + ch;
2343 for(i=0;i<nb_frames;i++) {
2344 ff_mpa_synth_filter(s->synth_buf[ch], &(s->synth_buf_offset[ch]),
2345 window, &s->dither_state,
2346 samples_ptr, s->nb_channels,
2347 s->sb_samples[ch][i]);
2348 samples_ptr += 32 * s->nb_channels;
2354 return nb_frames * 32 * sizeof(OUT_INT) * s->nb_channels;
2357 static int decode_frame(AVCodecContext * avctx,
2358 void *data, int *data_size,
2359 uint8_t * buf, int buf_size)
2361 MPADecodeContext *s = avctx->priv_data;
2364 OUT_INT *out_samples = data;
2367 if(buf_size < HEADER_SIZE)
2370 header = AV_RB32(buf);
2371 if(ff_mpa_check_header(header) < 0){
2374 av_log(avctx, AV_LOG_ERROR, "Header missing skipping one byte.\n");
2378 if (ff_mpegaudio_decode_header(s, header) == 1) {
2379 /* free format: prepare to compute frame size */
2383 /* update codec info */
2384 avctx->channels = s->nb_channels;
2385 avctx->bit_rate = s->bit_rate;
2386 avctx->sub_id = s->layer;
2389 avctx->frame_size = 384;
2392 avctx->frame_size = 1152;
2396 avctx->frame_size = 576;
2398 avctx->frame_size = 1152;
2402 if(s->frame_size<=0 || s->frame_size > buf_size){
2403 av_log(avctx, AV_LOG_ERROR, "incomplete frame\n");
2405 }else if(s->frame_size < buf_size){
2406 av_log(avctx, AV_LOG_ERROR, "incorrect frame size\n");
2407 buf_size= s->frame_size;
2410 out_size = mp_decode_frame(s, out_samples, buf, buf_size);
2412 *data_size = out_size;
2413 avctx->sample_rate = s->sample_rate;
2414 //FIXME maybe move the other codec info stuff from above here too
2416 av_log(avctx, AV_LOG_DEBUG, "Error while decoding MPEG audio frame.\n"); //FIXME return -1 / but also return the number of bytes consumed
2421 static void flush(AVCodecContext *avctx){
2422 MPADecodeContext *s = avctx->priv_data;
2423 s->last_buf_size= 0;
2426 #ifdef CONFIG_MP3ADU_DECODER
2427 static int decode_frame_adu(AVCodecContext * avctx,
2428 void *data, int *data_size,
2429 uint8_t * buf, int buf_size)
2431 MPADecodeContext *s = avctx->priv_data;
2434 OUT_INT *out_samples = data;
2438 // Discard too short frames
2439 if (buf_size < HEADER_SIZE) {
2445 if (len > MPA_MAX_CODED_FRAME_SIZE)
2446 len = MPA_MAX_CODED_FRAME_SIZE;
2448 // Get header and restore sync word
2449 header = AV_RB32(buf) | 0xffe00000;
2451 if (ff_mpa_check_header(header) < 0) { // Bad header, discard frame
2456 ff_mpegaudio_decode_header(s, header);
2457 /* update codec info */
2458 avctx->sample_rate = s->sample_rate;
2459 avctx->channels = s->nb_channels;
2460 avctx->bit_rate = s->bit_rate;
2461 avctx->sub_id = s->layer;
2463 avctx->frame_size=s->frame_size = len;
2465 if (avctx->parse_only) {
2466 out_size = buf_size;
2468 out_size = mp_decode_frame(s, out_samples, buf, buf_size);
2471 *data_size = out_size;
2474 #endif /* CONFIG_MP3ADU_DECODER */
2476 #ifdef CONFIG_MP3ON4_DECODER
2477 /* Next 3 arrays are indexed by channel config number (passed via codecdata) */
2478 static int mp3Frames[16] = {0,1,1,2,3,3,4,5,2}; /* number of mp3 decoder instances */
2479 static int mp3Channels[16] = {0,1,2,3,4,5,6,8,4}; /* total output channels */
2480 /* offsets into output buffer, assume output order is FL FR BL BR C LFE */
2481 static int chan_offset[9][5] = {
2486 {2,0,3}, // C FLR BS
2487 {4,0,2}, // C FLR BLRS
2488 {4,0,2,5}, // C FLR BLRS LFE
2489 {4,0,2,6,5}, // C FLR BLRS BLR LFE
2494 static int decode_init_mp3on4(AVCodecContext * avctx)
2496 MP3On4DecodeContext *s = avctx->priv_data;
2499 if ((avctx->extradata_size < 2) || (avctx->extradata == NULL)) {
2500 av_log(avctx, AV_LOG_ERROR, "Codec extradata missing or too short.\n");
2504 s->chan_cfg = (((unsigned char *)avctx->extradata)[1] >> 3) & 0x0f;
2505 s->frames = mp3Frames[s->chan_cfg];
2507 av_log(avctx, AV_LOG_ERROR, "Invalid channel config number.\n");
2510 avctx->channels = mp3Channels[s->chan_cfg];
2512 /* Init the first mp3 decoder in standard way, so that all tables get builded
2513 * We replace avctx->priv_data with the context of the first decoder so that
2514 * decode_init() does not have to be changed.
2515 * Other decoders will be inited here copying data from the first context
2517 // Allocate zeroed memory for the first decoder context
2518 s->mp3decctx[0] = av_mallocz(sizeof(MPADecodeContext));
2519 // Put decoder context in place to make init_decode() happy
2520 avctx->priv_data = s->mp3decctx[0];
2522 // Restore mp3on4 context pointer
2523 avctx->priv_data = s;
2524 s->mp3decctx[0]->adu_mode = 1; // Set adu mode
2526 /* Create a separate codec/context for each frame (first is already ok).
2527 * Each frame is 1 or 2 channels - up to 5 frames allowed
2529 for (i = 1; i < s->frames; i++) {
2530 s->mp3decctx[i] = av_mallocz(sizeof(MPADecodeContext));
2531 s->mp3decctx[i]->compute_antialias = s->mp3decctx[0]->compute_antialias;
2532 s->mp3decctx[i]->adu_mode = 1;
2533 s->mp3decctx[i]->avctx = avctx;
2540 static int decode_close_mp3on4(AVCodecContext * avctx)
2542 MP3On4DecodeContext *s = avctx->priv_data;
2545 for (i = 0; i < s->frames; i++)
2546 if (s->mp3decctx[i])
2547 av_free(s->mp3decctx[i]);
2553 static int decode_frame_mp3on4(AVCodecContext * avctx,
2554 void *data, int *data_size,
2555 uint8_t * buf, int buf_size)
2557 MP3On4DecodeContext *s = avctx->priv_data;
2558 MPADecodeContext *m;
2559 int len, out_size = 0;
2561 OUT_INT *out_samples = data;
2562 OUT_INT decoded_buf[MPA_FRAME_SIZE * MPA_MAX_CHANNELS];
2563 OUT_INT *outptr, *bp;
2565 unsigned char *start2 = buf, *start;
2567 int off = avctx->channels;
2568 int *coff = chan_offset[s->chan_cfg];
2572 // Discard too short frames
2573 if (buf_size < HEADER_SIZE) {
2578 // If only one decoder interleave is not needed
2579 outptr = s->frames == 1 ? out_samples : decoded_buf;
2581 for (fr = 0; fr < s->frames; fr++) {
2583 fsize = (start[0] << 4) | (start[1] >> 4);
2588 if (fsize > MPA_MAX_CODED_FRAME_SIZE)
2589 fsize = MPA_MAX_CODED_FRAME_SIZE;
2590 m = s->mp3decctx[fr];
2594 header = AV_RB32(start) | 0xfff00000;
2596 if (ff_mpa_check_header(header) < 0) { // Bad header, discard block
2601 ff_mpegaudio_decode_header(m, header);
2602 mp_decode_frame(m, decoded_buf, start, fsize);
2604 n = MPA_FRAME_SIZE * m->nb_channels;
2605 out_size += n * sizeof(OUT_INT);
2607 /* interleave output data */
2608 bp = out_samples + coff[fr];
2609 if(m->nb_channels == 1) {
2610 for(j = 0; j < n; j++) {
2611 *bp = decoded_buf[j];
2615 for(j = 0; j < n; j++) {
2616 bp[0] = decoded_buf[j++];
2617 bp[1] = decoded_buf[j];
2624 /* update codec info */
2625 avctx->sample_rate = s->mp3decctx[0]->sample_rate;
2626 avctx->frame_size= buf_size;
2627 avctx->bit_rate = 0;
2628 for (i = 0; i < s->frames; i++)
2629 avctx->bit_rate += s->mp3decctx[i]->bit_rate;
2631 *data_size = out_size;
2634 #endif /* CONFIG_MP3ON4_DECODER */
2636 #ifdef CONFIG_MP2_DECODER
2637 AVCodec mp2_decoder =
2642 sizeof(MPADecodeContext),
2647 CODEC_CAP_PARSE_ONLY,
2650 #ifdef CONFIG_MP3_DECODER
2651 AVCodec mp3_decoder =
2656 sizeof(MPADecodeContext),
2661 CODEC_CAP_PARSE_ONLY,
2665 #ifdef CONFIG_MP3ADU_DECODER
2666 AVCodec mp3adu_decoder =
2671 sizeof(MPADecodeContext),
2676 CODEC_CAP_PARSE_ONLY,
2680 #ifdef CONFIG_MP3ON4_DECODER
2681 AVCodec mp3on4_decoder =
2686 sizeof(MP3On4DecodeContext),
2689 decode_close_mp3on4,
2690 decode_frame_mp3on4,