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reduce size of vlc table, thats slightly faster here
[libav.git] / libavcodec / mpegaudiodec.c
CommitLineData
de6d9b64
FB		 1/*
2 * MPEG Audio decoder
ff4ec49e 3 * Copyright (c) 2001, 2002 Fabrice Bellard.
de6d9b64 4 *
ff4ec49e
FB		 5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
de6d9b64 9 *
ff4ec49e 10 * This library is distributed in the hope that it will be useful,
de6d9b64 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
ff4ec49e
FB		 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
de6d9b64 14 *
ff4ec49e
FB		 15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
5509bffa 17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
de6d9b64 18 */
983e3246
MN		 19
20/**
21 * @file mpegaudiodec.c
22 * MPEG Audio decoder.
115329f1 23 */
983e3246 24
239c2f4c 25//#define DEBUG
de6d9b64 26#include "avcodec.h"
caa336b4 27#include "bitstream.h"
84f986c0 28#include "dsputil.h"
de6d9b64
FB		 29
30/*
239c2f4c
FB		 31 * TODO:
32 * - in low precision mode, use more 16 bit multiplies in synth filter
33 * - test lsf / mpeg25 extensively.
de6d9b64
FB		 34 */
35
239c2f4c
FB		 36/* define USE_HIGHPRECISION to have a bit exact (but slower) mpeg
37 audio decoder */
81552334 38#ifdef CONFIG_MPEGAUDIO_HP
5ab1972b 39# define USE_HIGHPRECISION
81552334 40#endif
239c2f4c 41
d9b1c197 42#include "mpegaudio.h"
a3a5f4d6 43
239c2f4c
FB		 44#define FRAC_ONE (1 << FRAC_BITS)
45
47a0cd74 46#ifdef ARCH_X86
f617aded
MN		 47# define MULL(ra, rb) \
48 ({ int rt, dummy; asm (\
49 "imull %3 \n\t"\
50 "shrdl %4, %%edx, %%eax \n\t"\
51 : "=a"(rt), "=d"(dummy)\
52 : "a" (ra), "rm" (rb), "i"(FRAC_BITS));\
53 rt; })
47a0cd74
MN		 54# define MUL64(ra, rb) \
55 ({ int64_t rt; asm ("imull %2\n\t" : "=A"(rt) : "a" (ra), "g" (rb)); rt; })
56# define MULH(ra, rb) \
57 ({ int rt, dummy; asm ("imull %3\n\t" : "=d"(rt), "=a"(dummy): "a" (ra), "rm" (rb)); rt; })
69fd15f8
MN		 58#elif defined(ARCH_ARMV4L)
59# define MULL(a, b) \
60 ({ int lo, hi;\
61 asm("smull %0, %1, %2, %3 \n\t"\
acba3238
AJ		 62 "mov %0, %0, lsr %4\n\t"\
63 "add %1, %0, %1, lsl %5\n\t"\
64 : "=&r"(lo), "=&r"(hi)\
69fd15f8
MN		 65 : "r"(b), "r"(a), "i"(FRAC_BITS), "i"(32-FRAC_BITS));\
66 hi; })
67# define MUL64(a,b) ((int64_t)(a) * (int64_t)(b))
acba3238 68# define MULH(a, b) ({ int lo, hi; asm ("smull %0, %1, %2, %3" : "=&r"(lo), "=&r"(hi) : "r"(b), "r"(a)); hi; })
47a0cd74
MN		 69#else
70# define MULL(a,b) (((int64_t)(a) * (int64_t)(b)) >> FRAC_BITS)
71# define MUL64(a,b) ((int64_t)(a) * (int64_t)(b))
72//#define MULH(a,b) (((int64_t)(a) * (int64_t)(b))>>32) //gcc 3.4 creates an incredibly bloated mess out of this
73static always_inline int MULH(int a, int b){
74 return ((int64_t)(a) * (int64_t)(b))>>32;
75}
76#endif
239c2f4c
FB		 77#define FIX(a) ((int)((a) * FRAC_ONE))
78/* WARNING: only correct for posititive numbers */
79#define FIXR(a) ((int)((a) * FRAC_ONE + 0.5))
80#define FRAC_RND(a) (((a) + (FRAC_ONE/2)) >> FRAC_BITS)
81
711ae726 82#define FIXHR(a) ((int)((a) * (1LL<<32) + 0.5))
711ae726 83
239c2f4c
FB		 84/****************/
85
de6d9b64
FB		 86#define HEADER_SIZE 4
87#define BACKSTEP_SIZE 512
88
a1e257b2
MN		 89struct GranuleDef;
90
de6d9b64 91typedef struct MPADecodeContext {
bb270c08 92 uint8_t inbuf1[2][MPA_MAX_CODED_FRAME_SIZE + BACKSTEP_SIZE]; /* input buffer */
de6d9b64 93 int inbuf_index;
0c1a9eda 94 uint8_t *inbuf_ptr, *inbuf;
de6d9b64 95 int frame_size;
239c2f4c
FB		 96 int free_format_frame_size; /* frame size in case of free format
97 (zero if currently unknown) */
98 /* next header (used in free format parsing) */
115329f1 99 uint32_t free_format_next_header;
de6d9b64
FB		 100 int error_protection;
101 int layer;
102 int sample_rate;
239c2f4c 103 int sample_rate_index; /* between 0 and 8 */
de6d9b64
FB		 104 int bit_rate;
105 int old_frame_size;
106 GetBitContext gb;
239c2f4c
FB		 107 int nb_channels;
108 int mode;
109 int mode_ext;
110 int lsf;
a05c8d71 111 MPA_INT synth_buf[MPA_MAX_CHANNELS][512 * 2] __attribute__((aligned(16)));
239c2f4c 112 int synth_buf_offset[MPA_MAX_CHANNELS];
a05c8d71 113 int32_t sb_samples[MPA_MAX_CHANNELS][36][SBLIMIT] __attribute__((aligned(16)));
0c1a9eda 114 int32_t mdct_buf[MPA_MAX_CHANNELS][SBLIMIT * 18]; /* previous samples, for layer 3 MDCT */
239c2f4c
FB		 115#ifdef DEBUG
116 int frame_count;
117#endif
a1e257b2 118 void (*compute_antialias)(struct MPADecodeContext *s, struct GranuleDef *g);
1ede228a 119 int adu_mode; ///< 0 for standard mp3, 1 for adu formatted mp3
a7a85899 120 unsigned int dither_state;
de6d9b64
FB		 121} MPADecodeContext;
122
d2a7718d
RT		 123/**
124 * Context for MP3On4 decoder
125 */
126typedef struct MP3On4DecodeContext {
127 int frames; ///< number of mp3 frames per block (number of mp3 decoder instances)
128 int chan_cfg; ///< channel config number
129 MPADecodeContext *mp3decctx[5]; ///< MPADecodeContext for every decoder instance
130} MP3On4DecodeContext;
131
239c2f4c
FB		 132/* layer 3 "granule" */
133typedef struct GranuleDef {
0c1a9eda 134 uint8_t scfsi;
239c2f4c
FB		 135 int part2_3_length;
136 int big_values;
137 int global_gain;
138 int scalefac_compress;
0c1a9eda
ZK		 139 uint8_t block_type;
140 uint8_t switch_point;
239c2f4c
FB		 141 int table_select[3];
142 int subblock_gain[3];
0c1a9eda
ZK		 143 uint8_t scalefac_scale;
144 uint8_t count1table_select;
239c2f4c
FB		 145 int region_size[3]; /* number of huffman codes in each region */
146 int preflag;
147 int short_start, long_end; /* long/short band indexes */
0c1a9eda
ZK		 148 uint8_t scale_factors[40];
149 int32_t sb_hybrid[SBLIMIT * 18]; /* 576 samples */
239c2f4c 150} GranuleDef;
de6d9b64 151
239c2f4c
FB		 152#define MODE_EXT_MS_STEREO 2
153#define MODE_EXT_I_STEREO 1
154
155/* layer 3 huffman tables */
156typedef struct HuffTable {
157 int xsize;
0c1a9eda
ZK		 158 const uint8_t *bits;
159 const uint16_t *codes;
239c2f4c
FB		 160} HuffTable;
161
162#include "mpegaudiodectab.h"
163
a1e257b2
MN		 164static void compute_antialias_integer(MPADecodeContext *s, GranuleDef *g);
165static void compute_antialias_float(MPADecodeContext *s, GranuleDef *g);
166
239c2f4c 167/* vlc structure for decoding layer 3 huffman tables */
115329f1 168static VLC huff_vlc[16];
239c2f4c
FB		 169static VLC huff_quad_vlc[2];
170/* computed from band_size_long */
0c1a9eda 171static uint16_t band_index_long[9][23];
239c2f4c 172/* XXX: free when all decoders are closed */
d04728bb 173#define TABLE_4_3_SIZE (8191 + 16)*4
0c1a9eda 174static int8_t *table_4_3_exp;
0c1a9eda 175static uint32_t *table_4_3_value;
f8347c41 176static uint32_t exp_table[512];
55017f35 177static uint32_t expval_table[512][16];
239c2f4c 178/* intensity stereo coef table */
0c1a9eda
ZK		 179static int32_t is_table[2][16];
180static int32_t is_table_lsf[2][2][16];
a1e257b2
MN		 181static int32_t csa_table[8][4];
182static float csa_table_float[8][4];
0c1a9eda 183static int32_t mdct_win[8][36];
239c2f4c
FB		 184
185/* lower 2 bits: modulo 3, higher bits: shift */
0c1a9eda 186static uint16_t scale_factor_modshift[64];
239c2f4c 187/* [i][j]: 2^(-j/3) * FRAC_ONE * 2^(i+2) / (2^(i+2) - 1) */
0c1a9eda 188static int32_t scale_factor_mult[15][3];
239c2f4c
FB		 189/* mult table for layer 2 group quantization */
190
191#define SCALE_GEN(v) \
192{ FIXR(1.0 * (v)), FIXR(0.7937005259 * (v)), FIXR(0.6299605249 * (v)) }
193
c26ae41d 194static const int32_t scale_factor_mult2[3][3] = {
81552334
FB		 195 SCALE_GEN(4.0 / 3.0), /* 3 steps */
196 SCALE_GEN(4.0 / 5.0), /* 5 steps */
197 SCALE_GEN(4.0 / 9.0), /* 9 steps */
239c2f4c
FB		 198};
199
bf1f4da0 200void ff_mpa_synth_init(MPA_INT *window);
a05c8d71 201static MPA_INT window[512] __attribute__((aligned(16)));
115329f1 202
239c2f4c
FB		 203/* layer 1 unscaling */
204/* n = number of bits of the mantissa minus 1 */
205static inline int l1_unscale(int n, int mant, int scale_factor)
206{
207 int shift, mod;
0c1a9eda 208 int64_t val;
239c2f4c
FB		 209
210 shift = scale_factor_modshift[scale_factor];
211 mod = shift & 3;
212 shift >>= 2;
213 val = MUL64(mant + (-1 << n) + 1, scale_factor_mult[n-1][mod]);
214 shift += n;
81552334
FB		 215 /* NOTE: at this point, 1 <= shift >= 21 + 15 */
216 return (int)((val + (1LL << (shift - 1))) >> shift);
239c2f4c
FB		 217}
218
219static inline int l2_unscale_group(int steps, int mant, int scale_factor)
220{
221 int shift, mod, val;
222
223 shift = scale_factor_modshift[scale_factor];
224 mod = shift & 3;
225 shift >>= 2;
81552334
FB		 226
227 val = (mant - (steps >> 1)) * scale_factor_mult2[steps >> 2][mod];
228 /* NOTE: at this point, 0 <= shift <= 21 */
229 if (shift > 0)
230 val = (val + (1 << (shift - 1))) >> shift;
231 return val;
239c2f4c
FB		 232}
233
234/* compute value^(4/3) * 2^(exponent/4). It normalized to FRAC_BITS */
235static inline int l3_unscale(int value, int exponent)
236{
239c2f4c 237 unsigned int m;
239c2f4c
FB		 238 int e;
239
d04728bb
MN		 240 e = table_4_3_exp [4*value + (exponent&3)];
241 m = table_4_3_value[4*value + (exponent&3)];
242 e -= (exponent >> 2);
243 assert(e>=1);
239c2f4c 244 if (e > 31)
b696d2a6 245 return 0;
239c2f4c 246 m = (m + (1 << (e-1))) >> e;
d04728bb 247
239c2f4c 248 return m;
239c2f4c
FB		 249}
250
f9ed4f88
FB		 251/* all integer n^(4/3) computation code */
252#define DEV_ORDER 13
253
254#define POW_FRAC_BITS 24
255#define POW_FRAC_ONE (1 << POW_FRAC_BITS)
256#define POW_FIX(a) ((int)((a) * POW_FRAC_ONE))
0c1a9eda 257#define POW_MULL(a,b) (((int64_t)(a) * (int64_t)(b)) >> POW_FRAC_BITS)
f9ed4f88
FB		 258
259static int dev_4_3_coefs[DEV_ORDER];
260
88730be6 261#if 0 /* unused */
f9ed4f88
FB		 262static int pow_mult3[3] = {
263 POW_FIX(1.0),
264 POW_FIX(1.25992104989487316476),
265 POW_FIX(1.58740105196819947474),
266};
88730be6 267#endif
f9ed4f88
FB		 268
269static void int_pow_init(void)
270{
271 int i, a;
272
273 a = POW_FIX(1.0);
274 for(i=0;i<DEV_ORDER;i++) {
275 a = POW_MULL(a, POW_FIX(4.0 / 3.0) - i * POW_FIX(1.0)) / (i + 1);
276 dev_4_3_coefs[i] = a;
277 }
278}
279
88730be6 280#if 0 /* unused, remove? */
f9ed4f88
FB		 281/* return the mantissa and the binary exponent */
282static int int_pow(int i, int *exp_ptr)
283{
284 int e, er, eq, j;
285 int a, a1;
115329f1 286
f9ed4f88
FB		 287 /* renormalize */
288 a = i;
289 e = POW_FRAC_BITS;
290 while (a < (1 << (POW_FRAC_BITS - 1))) {
291 a = a << 1;
292 e--;
293 }
294 a -= (1 << POW_FRAC_BITS);
295 a1 = 0;
296 for(j = DEV_ORDER - 1; j >= 0; j--)
297 a1 = POW_MULL(a, dev_4_3_coefs[j] + a1);
298 a = (1 << POW_FRAC_BITS) + a1;
299 /* exponent compute (exact) */
300 e = e * 4;
301 er = e % 3;
302 eq = e / 3;
303 a = POW_MULL(a, pow_mult3[er]);
304 while (a >= 2 * POW_FRAC_ONE) {
305 a = a >> 1;
306 eq++;
307 }
308 /* convert to float */
309 while (a < POW_FRAC_ONE) {
310 a = a << 1;
311 eq--;
312 }
59d3e367 313 /* now POW_FRAC_ONE <= a < 2 * POW_FRAC_ONE */
81552334 314#if POW_FRAC_BITS > FRAC_BITS
59d3e367
FB		 315 a = (a + (1 << (POW_FRAC_BITS - FRAC_BITS - 1))) >> (POW_FRAC_BITS - FRAC_BITS);
316 /* correct overflow */
317 if (a >= 2 * (1 << FRAC_BITS)) {
318 a = a >> 1;
319 eq++;
320 }
321#endif
f9ed4f88 322 *exp_ptr = eq;
f9ed4f88 323 return a;
f9ed4f88 324}
88730be6 325#endif
de6d9b64
FB		 326
327static int decode_init(AVCodecContext * avctx)
328{
329 MPADecodeContext *s = avctx->priv_data;
b587a7cb 330 static int init=0;
239c2f4c 331 int i, j, k;
de6d9b64 332
e6885654 333#if defined(USE_HIGHPRECISION) && defined(CONFIG_AUDIO_NONSHORT)
a3a5f4d6
MN		 334 avctx->sample_fmt= SAMPLE_FMT_S32;
335#else
336 avctx->sample_fmt= SAMPLE_FMT_S16;
115329f1
DB		 337#endif
338
ce4a29c0 339 if(avctx->antialias_algo != FF_AA_FLOAT)
ac806113
MN		 340 s->compute_antialias= compute_antialias_integer;
341 else
342 s->compute_antialias= compute_antialias_float;
343
8c5b5683 344 if (!init && !avctx->parse_only) {
239c2f4c
FB		 345 /* scale factors table for layer 1/2 */
346 for(i=0;i<64;i++) {
347 int shift, mod;
348 /* 1.0 (i = 3) is normalized to 2 ^ FRAC_BITS */
81552334 349 shift = (i / 3);
239c2f4c 350 mod = i % 3;
239c2f4c
FB		 351 scale_factor_modshift[i] = mod | (shift << 2);
352 }
353
354 /* scale factor multiply for layer 1 */
355 for(i=0;i<15;i++) {
356 int n, norm;
357 n = i + 2;
0c1a9eda 358 norm = ((int64_t_C(1) << n) * FRAC_ONE) / ((1 << n) - 1);
81552334
FB		 359 scale_factor_mult[i][0] = MULL(FIXR(1.0 * 2.0), norm);
360 scale_factor_mult[i][1] = MULL(FIXR(0.7937005259 * 2.0), norm);
361 scale_factor_mult[i][2] = MULL(FIXR(0.6299605249 * 2.0), norm);
239c2f4c 362 dprintf("%d: norm=%x s=%x %x %x\n",
115329f1 363 i, norm,
239c2f4c
FB		 364 scale_factor_mult[i][0],
365 scale_factor_mult[i][1],
366 scale_factor_mult[i][2]);
367 }
115329f1 368
bb270c08 369 ff_mpa_synth_init(window);
115329f1 370
239c2f4c 371 /* huffman decode tables */
239c2f4c
FB		 372 for(i=1;i<16;i++) {
373 const HuffTable *h = &mpa_huff_tables[i];
bb270c08 374 int xsize, x, y;
5c91a675 375 unsigned int n;
c7aa3696
MN		 376 uint8_t tmp_bits [256];
377 uint16_t tmp_codes[256];
378
379 memset(tmp_bits , 0, sizeof(tmp_bits ));
380 memset(tmp_codes, 0, sizeof(tmp_codes));
239c2f4c
FB		 381
382 xsize = h->xsize;
383 n = xsize * xsize;
115329f1 384
239c2f4c
FB		 385 j = 0;
386 for(x=0;x<xsize;x++) {
c7aa3696
MN		 387 for(y=0;y<xsize;y++){
388 tmp_bits [(x << 4) | y]= h->bits [j ];
389 tmp_codes[(x << 4) | y]= h->codes[j++];
390 }
239c2f4c 391 }
c7aa3696
MN		 392
393 /* XXX: fail test */
1f1d675b 394 init_vlc(&huff_vlc[i], 7, 256,
c7aa3696 395 tmp_bits, 1, 1, tmp_codes, 2, 2, 1);
239c2f4c
FB		 396 }
397 for(i=0;i<2;i++) {
115329f1 398 init_vlc(&huff_quad_vlc[i], i == 0 ? 7 : 4, 16,
073c2593 399 mpa_quad_bits[i], 1, 1, mpa_quad_codes[i], 1, 1, 1);
239c2f4c
FB		 400 }
401
402 for(i=0;i<9;i++) {
403 k = 0;
404 for(j=0;j<22;j++) {
405 band_index_long[i][j] = k;
406 k += band_size_long[i][j];
407 }
408 band_index_long[i][22] = k;
409 }
410
bb270c08
DB		 411 /* compute n ^ (4/3) and store it in mantissa/exp format */
412 table_4_3_exp= av_mallocz_static(TABLE_4_3_SIZE * sizeof(table_4_3_exp[0]));
8d1f2ba5 413 if(!table_4_3_exp)
bb270c08
DB		 414 return -1;
415 table_4_3_value= av_mallocz_static(TABLE_4_3_SIZE * sizeof(table_4_3_value[0]));
8d1f2ba5 416 if(!table_4_3_value)
239c2f4c 417 return -1;
115329f1 418
f9ed4f88 419 int_pow_init();
239c2f4c 420 for(i=1;i<TABLE_4_3_SIZE;i++) {
d04728bb 421 double f, fm;
239c2f4c 422 int e, m;
d04728bb
MN		 423 f = pow((double)(i/4), 4.0 / 3.0) * pow(2, (i&3)*0.25);
424 fm = frexp(f, &e);
f86f4481 425 m = (uint32_t)(fm*(1LL<<31) + 0.5);
44f1698a 426 e+= FRAC_BITS - 31 + 5;
d04728bb 427
239c2f4c
FB		 428 /* normalized to FRAC_BITS */
429 table_4_3_value[i] = m;
d04728bb
MN		 430// av_log(NULL, AV_LOG_DEBUG, "%d %d %f\n", i, m, pow((double)i, 4.0 / 3.0));
431 table_4_3_exp[i] = -e;
239c2f4c 432 }
55017f35
MN		 433 for(i=0; i<512*16; i++){
434 int exponent= (i>>4)-400;
435 double f= pow(i&15, 4.0 / 3.0) * pow(2, exponent*0.25 + FRAC_BITS + 5);
436 expval_table[exponent+400][i&15]= lrintf(f);
437 if((i&15)==1)
438 exp_table[exponent+400]= lrintf(f);
f8347c41 439 }
115329f1 440
239c2f4c
FB		 441 for(i=0;i<7;i++) {
442 float f;
443 int v;
444 if (i != 6) {
445 f = tan((double)i * M_PI / 12.0);
446 v = FIXR(f / (1.0 + f));
447 } else {
448 v = FIXR(1.0);
449 }
450 is_table[0][i] = v;
451 is_table[1][6 - i] = v;
452 }
453 /* invalid values */
454 for(i=7;i<16;i++)
455 is_table[0][i] = is_table[1][i] = 0.0;
456
457 for(i=0;i<16;i++) {
458 double f;
459 int e, k;
460
461 for(j=0;j<2;j++) {
462 e = -(j + 1) * ((i + 1) >> 1);
463 f = pow(2.0, e / 4.0);
464 k = i & 1;
465 is_table_lsf[j][k ^ 1][i] = FIXR(f);
466 is_table_lsf[j][k][i] = FIXR(1.0);
115329f1 467 dprintf("is_table_lsf %d %d: %x %x\n",
239c2f4c
FB		 468 i, j, is_table_lsf[j][0][i], is_table_lsf[j][1][i]);
469 }
470 }
471
472 for(i=0;i<8;i++) {
473 float ci, cs, ca;
474 ci = ci_table[i];
475 cs = 1.0 / sqrt(1.0 + ci * ci);
476 ca = cs * ci;
ce4a29c0
MN		 477 csa_table[i][0] = FIXHR(cs/4);
478 csa_table[i][1] = FIXHR(ca/4);
479 csa_table[i][2] = FIXHR(ca/4) + FIXHR(cs/4);
115329f1 480 csa_table[i][3] = FIXHR(ca/4) - FIXHR(cs/4);
a1e257b2
MN		 481 csa_table_float[i][0] = cs;
482 csa_table_float[i][1] = ca;
483 csa_table_float[i][2] = ca + cs;
115329f1 484 csa_table_float[i][3] = ca - cs;
a1e257b2 485// printf("%d %d %d %d\n", FIX(cs), FIX(cs-1), FIX(ca), FIX(cs)-FIX(ca));
711ae726 486// av_log(NULL, AV_LOG_DEBUG,"%f %f %f %f\n", cs, ca, ca+cs, ca-cs);
239c2f4c
FB		 487 }
488
489 /* compute mdct windows */
490 for(i=0;i<36;i++) {
711ae726
MN		 491 for(j=0; j<4; j++){
492 double d;
115329f1 493
125d6246
MN		 494 if(j==2 && i%3 != 1)
495 continue;
115329f1 496
711ae726
MN		 497 d= sin(M_PI * (i + 0.5) / 36.0);
498 if(j==1){
499 if (i>=30) d= 0;
500 else if(i>=24) d= sin(M_PI * (i - 18 + 0.5) / 12.0);
501 else if(i>=18) d= 1;
502 }else if(j==3){
503 if (i< 6) d= 0;
504 else if(i< 12) d= sin(M_PI * (i - 6 + 0.5) / 12.0);
505 else if(i< 18) d= 1;
506 }
507 //merge last stage of imdct into the window coefficients
125d6246
MN		 508 d*= 0.5 / cos(M_PI*(2*i + 19)/72);
509
510 if(j==2)
511 mdct_win[j][i/3] = FIXHR((d / (1<<5)));
512 else
513 mdct_win[j][i ] = FIXHR((d / (1<<5)));
711ae726
MN		 514// av_log(NULL, AV_LOG_DEBUG, "%2d %d %f\n", i,j,d / (1<<5));
515 }
239c2f4c
FB		 516 }
517
239c2f4c
FB		 518 /* NOTE: we do frequency inversion adter the MDCT by changing
519 the sign of the right window coefs */
520 for(j=0;j<4;j++) {
521 for(i=0;i<36;i+=2) {
522 mdct_win[j + 4][i] = mdct_win[j][i];
523 mdct_win[j + 4][i + 1] = -mdct_win[j][i + 1];
524 }
525 }
526
527#if defined(DEBUG)
528 for(j=0;j<8;j++) {
267f7edc 529 av_log(avctx, AV_LOG_DEBUG, "win%d=\n", j);
239c2f4c 530 for(i=0;i<36;i++)
267f7edc
SH		 531 av_log(avctx, AV_LOG_DEBUG, "%f, ", (double)mdct_win[j][i] / FRAC_ONE);
532 av_log(avctx, AV_LOG_DEBUG, "\n");
239c2f4c
FB		 533 }
534#endif
de6d9b64 535 init = 1;
de6d9b64
FB		 536 }
537
538 s->inbuf_index = 0;
539 s->inbuf = &s->inbuf1[s->inbuf_index][BACKSTEP_SIZE];
540 s->inbuf_ptr = s->inbuf;
239c2f4c
FB		 541#ifdef DEBUG
542 s->frame_count = 0;
543#endif
1ede228a
RT		 544 if (avctx->codec_id == CODEC_ID_MP3ADU)
545 s->adu_mode = 1;
de6d9b64
FB		 546 return 0;
547}
548
ef9f7306 549/* tab[i][j] = 1.0 / (2.0 * cos(pi*(2*k+1) / 2^(6 - j))) */
239c2f4c
FB		 550
551/* cos(i*pi/64) */
552
0bd2483a
MN		 553#define COS0_0 FIXHR(0.50060299823519630134/2)
554#define COS0_1 FIXHR(0.50547095989754365998/2)
555#define COS0_2 FIXHR(0.51544730992262454697/2)
556#define COS0_3 FIXHR(0.53104259108978417447/2)
557#define COS0_4 FIXHR(0.55310389603444452782/2)
558#define COS0_5 FIXHR(0.58293496820613387367/2)
559#define COS0_6 FIXHR(0.62250412303566481615/2)
560#define COS0_7 FIXHR(0.67480834145500574602/2)
561#define COS0_8 FIXHR(0.74453627100229844977/2)
562#define COS0_9 FIXHR(0.83934964541552703873/2)
563#define COS0_10 FIXHR(0.97256823786196069369/2)
564#define COS0_11 FIXHR(1.16943993343288495515/4)
565#define COS0_12 FIXHR(1.48416461631416627724/4)
566#define COS0_13 FIXHR(2.05778100995341155085/8)
567#define COS0_14 FIXHR(3.40760841846871878570/8)
568#define COS0_15 FIXHR(10.19000812354805681150/32)
569
570#define COS1_0 FIXHR(0.50241928618815570551/2)
571#define COS1_1 FIXHR(0.52249861493968888062/2)
572#define COS1_2 FIXHR(0.56694403481635770368/2)
573#define COS1_3 FIXHR(0.64682178335999012954/2)
574#define COS1_4 FIXHR(0.78815462345125022473/2)
575#define COS1_5 FIXHR(1.06067768599034747134/4)
576#define COS1_6 FIXHR(1.72244709823833392782/4)
577#define COS1_7 FIXHR(5.10114861868916385802/16)
578
579#define COS2_0 FIXHR(0.50979557910415916894/2)
580#define COS2_1 FIXHR(0.60134488693504528054/2)
581#define COS2_2 FIXHR(0.89997622313641570463/2)
582#define COS2_3 FIXHR(2.56291544774150617881/8)
583
584#define COS3_0 FIXHR(0.54119610014619698439/2)
585#define COS3_1 FIXHR(1.30656296487637652785/4)
586
587#define COS4_0 FIXHR(0.70710678118654752439/2)
239c2f4c
FB		 588
589/* butterfly operator */
0bd2483a 590#define BF(a, b, c, s)\
239c2f4c
FB		 591{\
592 tmp0 = tab[a] + tab[b];\
593 tmp1 = tab[a] - tab[b];\
594 tab[a] = tmp0;\
0bd2483a 595 tab[b] = MULH(tmp1<<(s), c);\
239c2f4c
FB		 596}
597
598#define BF1(a, b, c, d)\
599{\
0bd2483a
MN		 600 BF(a, b, COS4_0, 1);\
601 BF(c, d,-COS4_0, 1);\
239c2f4c
FB		 602 tab[c] += tab[d];\
603}
604
605#define BF2(a, b, c, d)\
606{\
0bd2483a
MN		 607 BF(a, b, COS4_0, 1);\
608 BF(c, d,-COS4_0, 1);\
239c2f4c
FB		 609 tab[c] += tab[d];\
610 tab[a] += tab[c];\
611 tab[c] += tab[b];\
612 tab[b] += tab[d];\
613}
614
615#define ADD(a, b) tab[a] += tab[b]
616
617/* DCT32 without 1/sqrt(2) coef zero scaling. */
0c1a9eda 618static void dct32(int32_t *out, int32_t *tab)
239c2f4c
FB		 619{
620 int tmp0, tmp1;
621
622 /* pass 1 */
0bd2483a
MN		 623 BF( 0, 31, COS0_0 , 1);
624 BF(15, 16, COS0_15, 5);
120aad7f 625 /* pass 2 */
0bd2483a
MN		 626 BF( 0, 15, COS1_0 , 1);
627 BF(16, 31,-COS1_0 , 1);
120aad7f 628 /* pass 1 */
0bd2483a
MN		 629 BF( 7, 24, COS0_7 , 1);
630 BF( 8, 23, COS0_8 , 1);
120aad7f 631 /* pass 2 */
0bd2483a
MN		 632 BF( 7, 8, COS1_7 , 4);
633 BF(23, 24,-COS1_7 , 4);
120aad7f 634 /* pass 3 */
0bd2483a
MN		 635 BF( 0, 7, COS2_0 , 1);
636 BF( 8, 15,-COS2_0 , 1);
637 BF(16, 23, COS2_0 , 1);
638 BF(24, 31,-COS2_0 , 1);
120aad7f 639 /* pass 1 */
0bd2483a
MN		 640 BF( 3, 28, COS0_3 , 1);
641 BF(12, 19, COS0_12, 2);
239c2f4c 642 /* pass 2 */
0bd2483a
MN		 643 BF( 3, 12, COS1_3 , 1);
644 BF(19, 28,-COS1_3 , 1);
120aad7f 645 /* pass 1 */
0bd2483a
MN		 646 BF( 4, 27, COS0_4 , 1);
647 BF(11, 20, COS0_11, 2);
120aad7f 648 /* pass 2 */
0bd2483a
MN		 649 BF( 4, 11, COS1_4 , 1);
650 BF(20, 27,-COS1_4 , 1);
120aad7f 651 /* pass 3 */
0bd2483a
MN		 652 BF( 3, 4, COS2_3 , 3);
653 BF(11, 12,-COS2_3 , 3);
654 BF(19, 20, COS2_3 , 3);
655 BF(27, 28,-COS2_3 , 3);
120aad7f 656 /* pass 4 */
0bd2483a
MN		 657 BF( 0, 3, COS3_0 , 1);
658 BF( 4, 7,-COS3_0 , 1);
659 BF( 8, 11, COS3_0 , 1);
660 BF(12, 15,-COS3_0 , 1);
661 BF(16, 19, COS3_0 , 1);
662 BF(20, 23,-COS3_0 , 1);
663 BF(24, 27, COS3_0 , 1);
664 BF(28, 31,-COS3_0 , 1);
115329f1 665
120aad7f
MN		 666
667
668 /* pass 1 */
0bd2483a
MN		 669 BF( 1, 30, COS0_1 , 1);
670 BF(14, 17, COS0_14, 3);
120aad7f 671 /* pass 2 */
0bd2483a
MN		 672 BF( 1, 14, COS1_1 , 1);
673 BF(17, 30,-COS1_1 , 1);
120aad7f 674 /* pass 1 */
0bd2483a
MN		 675 BF( 6, 25, COS0_6 , 1);
676 BF( 9, 22, COS0_9 , 1);
120aad7f 677 /* pass 2 */
0bd2483a
MN		 678 BF( 6, 9, COS1_6 , 2);
679 BF(22, 25,-COS1_6 , 2);
239c2f4c 680 /* pass 3 */
0bd2483a
MN		 681 BF( 1, 6, COS2_1 , 1);
682 BF( 9, 14,-COS2_1 , 1);
683 BF(17, 22, COS2_1 , 1);
684 BF(25, 30,-COS2_1 , 1);
239c2f4c 685
120aad7f 686 /* pass 1 */
0bd2483a
MN		 687 BF( 2, 29, COS0_2 , 1);
688 BF(13, 18, COS0_13, 3);
120aad7f 689 /* pass 2 */
0bd2483a
MN		 690 BF( 2, 13, COS1_2 , 1);
691 BF(18, 29,-COS1_2 , 1);
120aad7f 692 /* pass 1 */
0bd2483a
MN		 693 BF( 5, 26, COS0_5 , 1);
694 BF(10, 21, COS0_10, 1);
120aad7f 695 /* pass 2 */
0bd2483a
MN		 696 BF( 5, 10, COS1_5 , 2);
697 BF(21, 26,-COS1_5 , 2);
120aad7f 698 /* pass 3 */
0bd2483a
MN		 699 BF( 2, 5, COS2_2 , 1);
700 BF(10, 13,-COS2_2 , 1);
701 BF(18, 21, COS2_2 , 1);
702 BF(26, 29,-COS2_2 , 1);
239c2f4c 703 /* pass 4 */
0bd2483a
MN		 704 BF( 1, 2, COS3_1 , 2);
705 BF( 5, 6,-COS3_1 , 2);
706 BF( 9, 10, COS3_1 , 2);
707 BF(13, 14,-COS3_1 , 2);
708 BF(17, 18, COS3_1 , 2);
709 BF(21, 22,-COS3_1 , 2);
710 BF(25, 26, COS3_1 , 2);
711 BF(29, 30,-COS3_1 , 2);
115329f1 712
239c2f4c 713 /* pass 5 */
0bd2483a
MN		 714 BF1( 0, 1, 2, 3);
715 BF2( 4, 5, 6, 7);
716 BF1( 8, 9, 10, 11);
239c2f4c
FB		 717 BF2(12, 13, 14, 15);
718 BF1(16, 17, 18, 19);
719 BF2(20, 21, 22, 23);
720 BF1(24, 25, 26, 27);
721 BF2(28, 29, 30, 31);
115329f1 722
239c2f4c 723 /* pass 6 */
115329f1 724
239c2f4c
FB		 725 ADD( 8, 12);
726 ADD(12, 10);
727 ADD(10, 14);
728 ADD(14, 9);
729 ADD( 9, 13);
730 ADD(13, 11);
731 ADD(11, 15);
732
733 out[ 0] = tab[0];
734 out[16] = tab[1];
735 out[ 8] = tab[2];
736 out[24] = tab[3];
737 out[ 4] = tab[4];
738 out[20] = tab[5];
739 out[12] = tab[6];
740 out[28] = tab[7];
741 out[ 2] = tab[8];
742 out[18] = tab[9];
743 out[10] = tab[10];
744 out[26] = tab[11];
745 out[ 6] = tab[12];
746 out[22] = tab[13];
747 out[14] = tab[14];
748 out[30] = tab[15];
115329f1 749
239c2f4c
FB		 750 ADD(24, 28);
751 ADD(28, 26);
752 ADD(26, 30);
753 ADD(30, 25);
754 ADD(25, 29);
755 ADD(29, 27);
756 ADD(27, 31);
757
758 out[ 1] = tab[16] + tab[24];
759 out[17] = tab[17] + tab[25];
760 out[ 9] = tab[18] + tab[26];
761 out[25] = tab[19] + tab[27];
762 out[ 5] = tab[20] + tab[28];
763 out[21] = tab[21] + tab[29];
764 out[13] = tab[22] + tab[30];
765 out[29] = tab[23] + tab[31];
766 out[ 3] = tab[24] + tab[20];
767 out[19] = tab[25] + tab[21];
768 out[11] = tab[26] + tab[22];
769 out[27] = tab[27] + tab[23];
770 out[ 7] = tab[28] + tab[18];
771 out[23] = tab[29] + tab[19];
772 out[15] = tab[30] + tab[17];
773 out[31] = tab[31];
774}
775
239c2f4c
FB		 776#if FRAC_BITS <= 15
777
a7a85899 778static inline int round_sample(int *sum)
8c5b5683
FB		 779{
780 int sum1;
a7a85899
MN		 781 sum1 = (*sum) >> OUT_SHIFT;
782 *sum &= (1<<OUT_SHIFT)-1;
a3a5f4d6
MN		 783 if (sum1 < OUT_MIN)
784 sum1 = OUT_MIN;
785 else if (sum1 > OUT_MAX)
786 sum1 = OUT_MAX;
8c5b5683 787 return sum1;
239c2f4c
FB		 788}
789
5ab1972b
MN		 790# if defined(ARCH_POWERPC_405)
791 /* signed 16x16 -> 32 multiply add accumulate */
792# define MACS(rt, ra, rb) \
793 asm ("maclhw %0, %2, %3" : "=r" (rt) : "0" (rt), "r" (ra), "r" (rb));
794
795 /* signed 16x16 -> 32 multiply */
796# define MULS(ra, rb) \
797 ({ int __rt; asm ("mullhw %0, %1, %2" : "=r" (__rt) : "r" (ra), "r" (rb)); __rt; })
798# else
799 /* signed 16x16 -> 32 multiply add accumulate */
800# define MACS(rt, ra, rb) rt += (ra) * (rb)
801
802 /* signed 16x16 -> 32 multiply */
803# define MULS(ra, rb) ((ra) * (rb))
804# endif
8c5b5683
FB		 805#else
806
115329f1 807static inline int round_sample(int64_t *sum)
8c5b5683
FB		 808{
809 int sum1;
a7a85899
MN		 810 sum1 = (int)((*sum) >> OUT_SHIFT);
811 *sum &= (1<<OUT_SHIFT)-1;
a3a5f4d6
MN		 812 if (sum1 < OUT_MIN)
813 sum1 = OUT_MIN;
814 else if (sum1 > OUT_MAX)
815 sum1 = OUT_MAX;
8c5b5683 816 return sum1;
239c2f4c
FB		 817}
818
47a0cd74 819# define MULS(ra, rb) MUL64(ra, rb)
8c5b5683
FB		 820#endif
821
822#define SUM8(sum, op, w, p) \
239c2f4c 823{ \
8c5b5683
FB		 824 sum op MULS((w)[0 * 64], p[0 * 64]);\
825 sum op MULS((w)[1 * 64], p[1 * 64]);\
826 sum op MULS((w)[2 * 64], p[2 * 64]);\
827 sum op MULS((w)[3 * 64], p[3 * 64]);\
828 sum op MULS((w)[4 * 64], p[4 * 64]);\
829 sum op MULS((w)[5 * 64], p[5 * 64]);\
830 sum op MULS((w)[6 * 64], p[6 * 64]);\
831 sum op MULS((w)[7 * 64], p[7 * 64]);\
832}
833
834#define SUM8P2(sum1, op1, sum2, op2, w1, w2, p) \
835{ \
836 int tmp;\
837 tmp = p[0 * 64];\
838 sum1 op1 MULS((w1)[0 * 64], tmp);\
839 sum2 op2 MULS((w2)[0 * 64], tmp);\
840 tmp = p[1 * 64];\
841 sum1 op1 MULS((w1)[1 * 64], tmp);\
842 sum2 op2 MULS((w2)[1 * 64], tmp);\
843 tmp = p[2 * 64];\
844 sum1 op1 MULS((w1)[2 * 64], tmp);\
845 sum2 op2 MULS((w2)[2 * 64], tmp);\
846 tmp = p[3 * 64];\
847 sum1 op1 MULS((w1)[3 * 64], tmp);\
848 sum2 op2 MULS((w2)[3 * 64], tmp);\
849 tmp = p[4 * 64];\
850 sum1 op1 MULS((w1)[4 * 64], tmp);\
851 sum2 op2 MULS((w2)[4 * 64], tmp);\
852 tmp = p[5 * 64];\
853 sum1 op1 MULS((w1)[5 * 64], tmp);\
854 sum2 op2 MULS((w2)[5 * 64], tmp);\
855 tmp = p[6 * 64];\
856 sum1 op1 MULS((w1)[6 * 64], tmp);\
857 sum2 op2 MULS((w2)[6 * 64], tmp);\
858 tmp = p[7 * 64];\
859 sum1 op1 MULS((w1)[7 * 64], tmp);\
860 sum2 op2 MULS((w2)[7 * 64], tmp);\
239c2f4c
FB		 861}
862
bf1f4da0
AB		 863void ff_mpa_synth_init(MPA_INT *window)
864{
865 int i;
866
867 /* max = 18760, max sum over all 16 coefs : 44736 */
868 for(i=0;i<257;i++) {
869 int v;
870 v = mpa_enwindow[i];
871#if WFRAC_BITS < 16
872 v = (v + (1 << (16 - WFRAC_BITS - 1))) >> (16 - WFRAC_BITS);
873#endif
874 window[i] = v;
875 if ((i & 63) != 0)
876 v = -v;
877 if (i != 0)
878 window[512 - i] = v;
115329f1 879 }
bf1f4da0 880}
239c2f4c
FB		 881
882/* 32 sub band synthesis filter. Input: 32 sub band samples, Output:
883 32 samples. */
884/* XXX: optimize by avoiding ring buffer usage */
bf1f4da0 885void ff_mpa_synth_filter(MPA_INT *synth_buf_ptr, int *synth_buf_offset,
bb270c08 886 MPA_INT *window, int *dither_state,
115329f1 887 OUT_INT *samples, int incr,
0c1a9eda 888 int32_t sb_samples[SBLIMIT])
239c2f4c 889{
0c1a9eda 890 int32_t tmp[32];
8c5b5683 891 register MPA_INT *synth_buf;
491c4a10 892 register const MPA_INT *w, *w2, *p;
239c2f4c 893 int j, offset, v;
a3a5f4d6 894 OUT_INT *samples2;
239c2f4c 895#if FRAC_BITS <= 15
8c5b5683 896 int sum, sum2;
239c2f4c 897#else
8c5b5683 898 int64_t sum, sum2;
239c2f4c 899#endif
bf1f4da0 900
239c2f4c 901 dct32(tmp, sb_samples);
115329f1 902
bf1f4da0
AB		 903 offset = *synth_buf_offset;
904 synth_buf = synth_buf_ptr + offset;
239c2f4c
FB		 905
906 for(j=0;j<32;j++) {
907 v = tmp[j];
908#if FRAC_BITS <= 15
81552334
FB		 909 /* NOTE: can cause a loss in precision if very high amplitude
910 sound */
239c2f4c
FB		 911 if (v > 32767)
912 v = 32767;
913 else if (v < -32768)
914 v = -32768;
915#endif
916 synth_buf[j] = v;
917 }
918 /* copy to avoid wrap */
919 memcpy(synth_buf + 512, synth_buf, 32 * sizeof(MPA_INT));
920
8c5b5683 921 samples2 = samples + 31 * incr;
239c2f4c 922 w = window;
8c5b5683
FB		 923 w2 = window + 31;
924
093c6e50 925 sum = *dither_state;
8c5b5683
FB		 926 p = synth_buf + 16;
927 SUM8(sum, +=, w, p);
928 p = synth_buf + 48;
929 SUM8(sum, -=, w + 32, p);
a7a85899 930 *samples = round_sample(&sum);
8c5b5683 931 samples += incr;
239c2f4c
FB		 932 w++;
933
8c5b5683
FB		 934 /* we calculate two samples at the same time to avoid one memory
935 access per two sample */
936 for(j=1;j<16;j++) {
8c5b5683
FB		 937 sum2 = 0;
938 p = synth_buf + 16 + j;
939 SUM8P2(sum, +=, sum2, -=, w, w2, p);
940 p = synth_buf + 48 - j;
941 SUM8P2(sum, -=, sum2, -=, w + 32, w2 + 32, p);
942
a7a85899 943 *samples = round_sample(&sum);
8c5b5683 944 samples += incr;
a7a85899
MN		 945 sum += sum2;
946 *samples2 = round_sample(&sum);
8c5b5683 947 samples2 -= incr;
239c2f4c 948 w++;
8c5b5683 949 w2--;
239c2f4c 950 }
115329f1 951
8c5b5683 952 p = synth_buf + 32;
8c5b5683 953 SUM8(sum, -=, w + 32, p);
a7a85899 954 *samples = round_sample(&sum);
093c6e50 955 *dither_state= sum;
8c5b5683 956
239c2f4c 957 offset = (offset - 32) & 511;
bf1f4da0 958 *synth_buf_offset = offset;
239c2f4c
FB		 959}
960
125d6246
MN		 961#define C3 FIXHR(0.86602540378443864676/2)
962
963/* 0.5 / cos(pi*(2*i+1)/36) */
964static const int icos36[9] = {
965 FIXR(0.50190991877167369479),
966 FIXR(0.51763809020504152469), //0
967 FIXR(0.55168895948124587824),
968 FIXR(0.61038729438072803416),
969 FIXR(0.70710678118654752439), //1
970 FIXR(0.87172339781054900991),
971 FIXR(1.18310079157624925896),
972 FIXR(1.93185165257813657349), //2
973 FIXR(5.73685662283492756461),
974};
239c2f4c 975
eb644776
MN		 976/* 0.5 / cos(pi*(2*i+1)/36) */
977static const int icos36h[9] = {
978 FIXHR(0.50190991877167369479/2),
979 FIXHR(0.51763809020504152469/2), //0
980 FIXHR(0.55168895948124587824/2),
981 FIXHR(0.61038729438072803416/2),
982 FIXHR(0.70710678118654752439/2), //1
983 FIXHR(0.87172339781054900991/2),
984 FIXHR(1.18310079157624925896/4),
985 FIXHR(1.93185165257813657349/4), //2
986// FIXHR(5.73685662283492756461),
987};
988
239c2f4c
FB		 989/* 12 points IMDCT. We compute it "by hand" by factorizing obvious
990 cases. */
991static void imdct12(int *out, int *in)
992{
125d6246 993 int in0, in1, in2, in3, in4, in5, t1, t2;
44f1698a
MN		 994
995 in0= in[0*3];
996 in1= in[1*3] + in[0*3];
997 in2= in[2*3] + in[1*3];
998 in3= in[3*3] + in[2*3];
999 in4= in[4*3] + in[3*3];
1000 in5= in[5*3] + in[4*3];
125d6246
MN		 1001 in5 += in3;
1002 in3 += in1;
1003
1004 in2= MULH(2*in2, C3);
eb644776 1005 in3= MULH(4*in3, C3);
115329f1 1006
125d6246 1007 t1 = in0 - in4;
eb644776 1008 t2 = MULH(2*(in1 - in5), icos36h[4]);
125d6246 1009
115329f1 1010 out[ 7]=
125d6246
MN		 1011 out[10]= t1 + t2;
1012 out[ 1]=
1013 out[ 4]= t1 - t2;
1014
1015 in0 += in4>>1;
1016 in4 = in0 + in2;
eb644776
MN		 1017 in5 += 2*in1;
1018 in1 = MULH(in5 + in3, icos36h[1]);
115329f1 1019 out[ 8]=
eb644776 1020 out[ 9]= in4 + in1;
125d6246 1021 out[ 2]=
eb644776 1022 out[ 3]= in4 - in1;
115329f1 1023
125d6246 1024 in0 -= in2;
eb644776 1025 in5 = MULH(2*(in5 - in3), icos36h[7]);
125d6246 1026 out[ 0]=
eb644776 1027 out[ 5]= in0 - in5;
125d6246 1028 out[ 6]=
eb644776 1029 out[11]= in0 + in5;
239c2f4c
FB		 1030}
1031
239c2f4c 1032/* cos(pi*i/18) */
711ae726
MN		 1033#define C1 FIXHR(0.98480775301220805936/2)
1034#define C2 FIXHR(0.93969262078590838405/2)
1035#define C3 FIXHR(0.86602540378443864676/2)
1036#define C4 FIXHR(0.76604444311897803520/2)
1037#define C5 FIXHR(0.64278760968653932632/2)
1038#define C6 FIXHR(0.5/2)
1039#define C7 FIXHR(0.34202014332566873304/2)
1040#define C8 FIXHR(0.17364817766693034885/2)
1041
239c2f4c 1042
239c2f4c 1043/* using Lee like decomposition followed by hand coded 9 points DCT */
711ae726 1044static void imdct36(int *out, int *buf, int *in, int *win)
239c2f4c
FB		 1045{
1046 int i, j, t0, t1, t2, t3, s0, s1, s2, s3;
1047 int tmp[18], *tmp1, *in1;
239c2f4c
FB		 1048
1049 for(i=17;i>=1;i--)
1050 in[i] += in[i-1];
1051 for(i=17;i>=3;i-=2)
1052 in[i] += in[i-2];
1053
1054 for(j=0;j<2;j++) {
1055 tmp1 = tmp + j;
1056 in1 = in + j;
711ae726
MN		 1057#if 0
1058//more accurate but slower
1059 int64_t t0, t1, t2, t3;
1060 t2 = in1[2*4] + in1[2*8] - in1[2*2];
115329f1 1061
711ae726
MN		 1062 t3 = (in1[2*0] + (int64_t)(in1[2*6]>>1))<<32;
1063 t1 = in1[2*0] - in1[2*6];
1064 tmp1[ 6] = t1 - (t2>>1);
1065 tmp1[16] = t1 + t2;
1066
1067 t0 = MUL64(2*(in1[2*2] + in1[2*4]), C2);
1068 t1 = MUL64( in1[2*4] - in1[2*8] , -2*C8);
1069 t2 = MUL64(2*(in1[2*2] + in1[2*8]), -C4);
115329f1 1070
711ae726
MN		 1071 tmp1[10] = (t3 - t0 - t2) >> 32;
1072 tmp1[ 2] = (t3 + t0 + t1) >> 32;
1073 tmp1[14] = (t3 + t2 - t1) >> 32;
115329f1 1074
711ae726
MN		 1075 tmp1[ 4] = MULH(2*(in1[2*5] + in1[2*7] - in1[2*1]), -C3);
1076 t2 = MUL64(2*(in1[2*1] + in1[2*5]), C1);
1077 t3 = MUL64( in1[2*5] - in1[2*7] , -2*C7);
1078 t0 = MUL64(2*in1[2*3], C3);
1079
1080 t1 = MUL64(2*(in1[2*1] + in1[2*7]), -C5);
1081
1082 tmp1[ 0] = (t2 + t3 + t0) >> 32;
1083 tmp1[12] = (t2 + t1 - t0) >> 32;
1084 tmp1[ 8] = (t3 - t1 - t0) >> 32;
1085#else
1086 t2 = in1[2*4] + in1[2*8] - in1[2*2];
115329f1 1087
711ae726
MN		 1088 t3 = in1[2*0] + (in1[2*6]>>1);
1089 t1 = in1[2*0] - in1[2*6];
1090 tmp1[ 6] = t1 - (t2>>1);
1091 tmp1[16] = t1 + t2;
1092
1093 t0 = MULH(2*(in1[2*2] + in1[2*4]), C2);
1094 t1 = MULH( in1[2*4] - in1[2*8] , -2*C8);
1095 t2 = MULH(2*(in1[2*2] + in1[2*8]), -C4);
115329f1 1096
711ae726
MN		 1097 tmp1[10] = t3 - t0 - t2;
1098 tmp1[ 2] = t3 + t0 + t1;
1099 tmp1[14] = t3 + t2 - t1;
115329f1 1100
711ae726
MN		 1101 tmp1[ 4] = MULH(2*(in1[2*5] + in1[2*7] - in1[2*1]), -C3);
1102 t2 = MULH(2*(in1[2*1] + in1[2*5]), C1);
1103 t3 = MULH( in1[2*5] - in1[2*7] , -2*C7);
1104 t0 = MULH(2*in1[2*3], C3);
239c2f4c 1105
711ae726
MN		 1106 t1 = MULH(2*(in1[2*1] + in1[2*7]), -C5);
1107
1108 tmp1[ 0] = t2 + t3 + t0;
1109 tmp1[12] = t2 + t1 - t0;
1110 tmp1[ 8] = t3 - t1 - t0;
1111#endif
239c2f4c
FB		 1112 }
1113
1114 i = 0;
1115 for(j=0;j<4;j++) {
1116 t0 = tmp[i];
1117 t1 = tmp[i + 2];
1118 s0 = t1 + t0;
1119 s2 = t1 - t0;
1120
1121 t2 = tmp[i + 1];
1122 t3 = tmp[i + 3];
eb644776 1123 s1 = MULH(2*(t3 + t2), icos36h[j]);
239c2f4c 1124 s3 = MULL(t3 - t2, icos36[8 - j]);
115329f1 1125
44f1698a
MN		 1126 t0 = s0 + s1;
1127 t1 = s0 - s1;
125d6246 1128 out[(9 + j)*SBLIMIT] = MULH(t1, win[9 + j]) + buf[9 + j];
711ae726
MN		 1129 out[(8 - j)*SBLIMIT] = MULH(t1, win[8 - j]) + buf[8 - j];
1130 buf[9 + j] = MULH(t0, win[18 + 9 + j]);
1131 buf[8 - j] = MULH(t0, win[18 + 8 - j]);
115329f1 1132
44f1698a
MN		 1133 t0 = s2 + s3;
1134 t1 = s2 - s3;
125d6246 1135 out[(9 + 8 - j)*SBLIMIT] = MULH(t1, win[9 + 8 - j]) + buf[9 + 8 - j];
711ae726
MN		 1136 out[( j)*SBLIMIT] = MULH(t1, win[ j]) + buf[ j];
1137 buf[9 + 8 - j] = MULH(t0, win[18 + 9 + 8 - j]);
1138 buf[ + j] = MULH(t0, win[18 + j]);
239c2f4c
FB		 1139 i += 4;
1140 }
1141
1142 s0 = tmp[16];
eb644776 1143 s1 = MULH(2*tmp[17], icos36h[4]);
44f1698a
MN		 1144 t0 = s0 + s1;
1145 t1 = s0 - s1;
125d6246 1146 out[(9 + 4)*SBLIMIT] = MULH(t1, win[9 + 4]) + buf[9 + 4];
711ae726
MN		 1147 out[(8 - 4)*SBLIMIT] = MULH(t1, win[8 - 4]) + buf[8 - 4];
1148 buf[9 + 4] = MULH(t0, win[18 + 9 + 4]);
1149 buf[8 - 4] = MULH(t0, win[18 + 8 - 4]);
239c2f4c
FB		 1150}
1151
de6d9b64 1152/* header decoding. MUST check the header before because no
239c2f4c
FB		 1153 consistency check is done there. Return 1 if free format found and
1154 that the frame size must be computed externally */
0c1a9eda 1155static int decode_header(MPADecodeContext *s, uint32_t header)
de6d9b64 1156{
239c2f4c
FB		 1157 int sample_rate, frame_size, mpeg25, padding;
1158 int sample_rate_index, bitrate_index;
de6d9b64 1159 if (header & (1<<20)) {
239c2f4c
FB		 1160 s->lsf = (header & (1<<19)) ? 0 : 1;
1161 mpeg25 = 0;
de6d9b64 1162 } else {
239c2f4c
FB		 1163 s->lsf = 1;
1164 mpeg25 = 1;
de6d9b64 1165 }
115329f1 1166
de6d9b64
FB		 1167 s->layer = 4 - ((header >> 17) & 3);
1168 /* extract frequency */
239c2f4c
FB		 1169 sample_rate_index = (header >> 10) & 3;
1170 sample_rate = mpa_freq_tab[sample_rate_index] >> (s->lsf + mpeg25);
1171 sample_rate_index += 3 * (s->lsf + mpeg25);
1172 s->sample_rate_index = sample_rate_index;
1173 s->error_protection = ((header >> 16) & 1) ^ 1;
81552334 1174 s->sample_rate = sample_rate;
de6d9b64 1175
239c2f4c
FB		 1176 bitrate_index = (header >> 12) & 0xf;
1177 padding = (header >> 9) & 1;
1178 //extension = (header >> 8) & 1;
1179 s->mode = (header >> 6) & 3;
1180 s->mode_ext = (header >> 4) & 3;
1181 //copyright = (header >> 3) & 1;
1182 //original = (header >> 2) & 1;
1183 //emphasis = header & 3;
de6d9b64 1184
239c2f4c
FB		 1185 if (s->mode == MPA_MONO)
1186 s->nb_channels = 1;
1187 else
1188 s->nb_channels = 2;
115329f1 1189
239c2f4c
FB		 1190 if (bitrate_index != 0) {
1191 frame_size = mpa_bitrate_tab[s->lsf][s->layer - 1][bitrate_index];
1192 s->bit_rate = frame_size * 1000;
1193 switch(s->layer) {
1194 case 1:
1195 frame_size = (frame_size * 12000) / sample_rate;
1196 frame_size = (frame_size + padding) * 4;
1197 break;
1198 case 2:
1199 frame_size = (frame_size * 144000) / sample_rate;
1200 frame_size += padding;
1201 break;
1202 default:
1203 case 3:
1204 frame_size = (frame_size * 144000) / (sample_rate << s->lsf);
1205 frame_size += padding;
1206 break;
1207 }
1208 s->frame_size = frame_size;
1209 } else {
1210 /* if no frame size computed, signal it */
1211 if (!s->free_format_frame_size)
1212 return 1;
1213 /* free format: compute bitrate and real frame size from the
1214 frame size we extracted by reading the bitstream */
1215 s->frame_size = s->free_format_frame_size;
1216 switch(s->layer) {
1217 case 1:
1218 s->frame_size += padding * 4;
1219 s->bit_rate = (s->frame_size * sample_rate) / 48000;
1220 break;
1221 case 2:
1222 s->frame_size += padding;
1223 s->bit_rate = (s->frame_size * sample_rate) / 144000;
1224 break;
1225 default:
1226 case 3:
1227 s->frame_size += padding;
1228 s->bit_rate = (s->frame_size * (sample_rate << s->lsf)) / 144000;
1229 break;
1230 }
de6d9b64 1231 }
115329f1 1232
fad9f495 1233#if defined(DEBUG)
267f7edc 1234 dprintf("layer%d, %d Hz, %d kbits/s, ",
239c2f4c
FB		 1235 s->layer, s->sample_rate, s->bit_rate);
1236 if (s->nb_channels == 2) {
1237 if (s->layer == 3) {
1238 if (s->mode_ext & MODE_EXT_MS_STEREO)
267f7edc 1239 dprintf("ms-");
239c2f4c 1240 if (s->mode_ext & MODE_EXT_I_STEREO)
267f7edc 1241 dprintf("i-");
239c2f4c 1242 }
267f7edc 1243 dprintf("stereo");
239c2f4c 1244 } else {
267f7edc 1245 dprintf("mono");
239c2f4c 1246 }
267f7edc 1247 dprintf("\n");
de6d9b64 1248#endif
239c2f4c 1249 return 0;
de6d9b64
FB		 1250}
1251
8c5b5683 1252/* useful helper to get mpeg audio stream infos. Return -1 if error in
962d6ae6
FB		 1253 header, otherwise the coded frame size in bytes */
1254int mpa_decode_header(AVCodecContext *avctx, uint32_t head)
8c5b5683
FB		 1255{
1256 MPADecodeContext s1, *s = &s1;
2caa92d9 1257 memset( s, 0, sizeof(MPADecodeContext) );
8c5b5683 1258
a7a85899 1259 if (ff_mpa_check_header(head) != 0)
8c5b5683
FB		 1260 return -1;
1261
1262 if (decode_header(s, head) != 0) {
1263 return -1;
1264 }
1265
1266 switch(s->layer) {
1267 case 1:
962d6ae6 1268 avctx->frame_size = 384;
8c5b5683
FB		 1269 break;
1270 case 2:
962d6ae6 1271 avctx->frame_size = 1152;
8c5b5683
FB		 1272 break;
1273 default:
1274 case 3:
1275 if (s->lsf)
962d6ae6 1276 avctx->frame_size = 576;
8c5b5683 1277 else
962d6ae6 1278 avctx->frame_size = 1152;
8c5b5683
FB		 1279 break;
1280 }
1281
962d6ae6
FB		 1282 avctx->sample_rate = s->sample_rate;
1283 avctx->channels = s->nb_channels;
1284 avctx->bit_rate = s->bit_rate;
1285 avctx->sub_id = s->layer;
1286 return s->frame_size;
8c5b5683
FB		 1287}
1288
239c2f4c
FB		 1289/* return the number of decoded frames */
1290static int mp_decode_layer1(MPADecodeContext *s)
de6d9b64 1291{
239c2f4c 1292 int bound, i, v, n, ch, j, mant;
0c1a9eda
ZK		 1293 uint8_t allocation[MPA_MAX_CHANNELS][SBLIMIT];
1294 uint8_t scale_factors[MPA_MAX_CHANNELS][SBLIMIT];
239c2f4c 1295
115329f1 1296 if (s->mode == MPA_JSTEREO)
239c2f4c
FB		 1297 bound = (s->mode_ext + 1) * 4;
1298 else
1299 bound = SBLIMIT;
1300
1301 /* allocation bits */
1302 for(i=0;i<bound;i++) {
1303 for(ch=0;ch<s->nb_channels;ch++) {
1304 allocation[ch][i] = get_bits(&s->gb, 4);
1305 }
1306 }
1307 for(i=bound;i<SBLIMIT;i++) {
1308 allocation[0][i] = get_bits(&s->gb, 4);
1309 }
1310
1311 /* scale factors */
1312 for(i=0;i<bound;i++) {
1313 for(ch=0;ch<s->nb_channels;ch++) {
1314 if (allocation[ch][i])
1315 scale_factors[ch][i] = get_bits(&s->gb, 6);
1316 }
1317 }
1318 for(i=bound;i<SBLIMIT;i++) {
1319 if (allocation[0][i]) {
1320 scale_factors[0][i] = get_bits(&s->gb, 6);
1321 scale_factors[1][i] = get_bits(&s->gb, 6);
1322 }
1323 }
115329f1 1324
239c2f4c
FB		 1325 /* compute samples */
1326 for(j=0;j<12;j++) {
1327 for(i=0;i<bound;i++) {
1328 for(ch=0;ch<s->nb_channels;ch++) {
1329 n = allocation[ch][i];
1330 if (n) {
1331 mant = get_bits(&s->gb, n + 1);
1332 v = l1_unscale(n, mant, scale_factors[ch][i]);
1333 } else {
1334 v = 0;
1335 }
1336 s->sb_samples[ch][j][i] = v;
1337 }
1338 }
1339 for(i=bound;i<SBLIMIT;i++) {
1340 n = allocation[0][i];
1341 if (n) {
1342 mant = get_bits(&s->gb, n + 1);
1343 v = l1_unscale(n, mant, scale_factors[0][i]);
1344 s->sb_samples[0][j][i] = v;
1345 v = l1_unscale(n, mant, scale_factors[1][i]);
1346 s->sb_samples[1][j][i] = v;
1347 } else {
1348 s->sb_samples[0][j][i] = 0;
1349 s->sb_samples[1][j][i] = 0;
1350 }
1351 }
1352 }
1353 return 12;
1354}
1355
1356/* bitrate is in kb/s */
1357int l2_select_table(int bitrate, int nb_channels, int freq, int lsf)
1358{
1359 int ch_bitrate, table;
115329f1 1360
239c2f4c
FB		 1361 ch_bitrate = bitrate / nb_channels;
1362 if (!lsf) {
1363 if ((freq == 48000 && ch_bitrate >= 56) ||
115329f1 1364 (ch_bitrate >= 56 && ch_bitrate <= 80))
239c2f4c 1365 table = 0;
115329f1 1366 else if (freq != 48000 && ch_bitrate >= 96)
239c2f4c 1367 table = 1;
115329f1 1368 else if (freq != 32000 && ch_bitrate <= 48)
239c2f4c 1369 table = 2;
115329f1 1370 else
239c2f4c
FB		 1371 table = 3;
1372 } else {
1373 table = 4;
1374 }
1375 return table;
1376}
de6d9b64 1377
239c2f4c
FB		 1378static int mp_decode_layer2(MPADecodeContext *s)
1379{
1380 int sblimit; /* number of used subbands */
1381 const unsigned char *alloc_table;
1382 int table, bit_alloc_bits, i, j, ch, bound, v;
1383 unsigned char bit_alloc[MPA_MAX_CHANNELS][SBLIMIT];
1384 unsigned char scale_code[MPA_MAX_CHANNELS][SBLIMIT];
1385 unsigned char scale_factors[MPA_MAX_CHANNELS][SBLIMIT][3], *sf;
1386 int scale, qindex, bits, steps, k, l, m, b;
de6d9b64 1387
239c2f4c 1388 /* select decoding table */
115329f1 1389 table = l2_select_table(s->bit_rate / 1000, s->nb_channels,
239c2f4c
FB		 1390 s->sample_rate, s->lsf);
1391 sblimit = sblimit_table[table];
1392 alloc_table = alloc_tables[table];
1393
115329f1 1394 if (s->mode == MPA_JSTEREO)
239c2f4c
FB		 1395 bound = (s->mode_ext + 1) * 4;
1396 else
1397 bound = sblimit;
1398
1399 dprintf("bound=%d sblimit=%d\n", bound, sblimit);
2caa92d9
MN		 1400
1401 /* sanity check */
1402 if( bound > sblimit ) bound = sblimit;
1403
239c2f4c
FB		 1404 /* parse bit allocation */
1405 j = 0;
1406 for(i=0;i<bound;i++) {
1407 bit_alloc_bits = alloc_table[j];
1408 for(ch=0;ch<s->nb_channels;ch++) {
1409 bit_alloc[ch][i] = get_bits(&s->gb, bit_alloc_bits);
1410 }
1411 j += 1 << bit_alloc_bits;
1412 }
1413 for(i=bound;i<sblimit;i++) {
1414 bit_alloc_bits = alloc_table[j];
1415 v = get_bits(&s->gb, bit_alloc_bits);
1416 bit_alloc[0][i] = v;
1417 bit_alloc[1][i] = v;
1418 j += 1 << bit_alloc_bits;
de6d9b64 1419 }
239c2f4c
FB		 1420
1421#ifdef DEBUG
1422 {
1423 for(ch=0;ch<s->nb_channels;ch++) {
1424 for(i=0;i<sblimit;i++)
267f7edc
SH		 1425 dprintf(" %d", bit_alloc[ch][i]);
1426 dprintf("\n");
239c2f4c
FB		 1427 }
1428 }
1429#endif
1430
1431 /* scale codes */
1432 for(i=0;i<sblimit;i++) {
1433 for(ch=0;ch<s->nb_channels;ch++) {
115329f1 1434 if (bit_alloc[ch][i])
239c2f4c
FB		 1435 scale_code[ch][i] = get_bits(&s->gb, 2);
1436 }
1437 }
115329f1 1438
239c2f4c
FB		 1439 /* scale factors */
1440 for(i=0;i<sblimit;i++) {
1441 for(ch=0;ch<s->nb_channels;ch++) {
1442 if (bit_alloc[ch][i]) {
1443 sf = scale_factors[ch][i];
1444 switch(scale_code[ch][i]) {
1445 default:
1446 case 0:
1447 sf[0] = get_bits(&s->gb, 6);
1448 sf[1] = get_bits(&s->gb, 6);
1449 sf[2] = get_bits(&s->gb, 6);
1450 break;
1451 case 2:
1452 sf[0] = get_bits(&s->gb, 6);
1453 sf[1] = sf[0];
1454 sf[2] = sf[0];
1455 break;
1456 case 1:
1457 sf[0] = get_bits(&s->gb, 6);
1458 sf[2] = get_bits(&s->gb, 6);
1459 sf[1] = sf[0];
1460 break;
1461 case 3:
1462 sf[0] = get_bits(&s->gb, 6);
1463 sf[2] = get_bits(&s->gb, 6);
1464 sf[1] = sf[2];
1465 break;
1466 }
1467 }
1468 }
1469 }
1470
1471#ifdef DEBUG
1472 for(ch=0;ch<s->nb_channels;ch++) {
1473 for(i=0;i<sblimit;i++) {
1474 if (bit_alloc[ch][i]) {
1475 sf = scale_factors[ch][i];
267f7edc 1476 dprintf(" %d %d %d", sf[0], sf[1], sf[2]);
239c2f4c 1477 } else {
267f7edc 1478 dprintf(" -");
239c2f4c
FB		 1479 }
1480 }
267f7edc 1481 dprintf("\n");
239c2f4c
FB		 1482 }
1483#endif
1484
1485 /* samples */
1486 for(k=0;k<3;k++) {
1487 for(l=0;l<12;l+=3) {
1488 j = 0;
1489 for(i=0;i<bound;i++) {
1490 bit_alloc_bits = alloc_table[j];
1491 for(ch=0;ch<s->nb_channels;ch++) {
1492 b = bit_alloc[ch][i];
1493 if (b) {
1494 scale = scale_factors[ch][i][k];
1495 qindex = alloc_table[j+b];
1496 bits = quant_bits[qindex];
1497 if (bits < 0) {
1498 /* 3 values at the same time */
1499 v = get_bits(&s->gb, -bits);
1500 steps = quant_steps[qindex];
115329f1 1501 s->sb_samples[ch][k * 12 + l + 0][i] =
239c2f4c
FB		 1502 l2_unscale_group(steps, v % steps, scale);
1503 v = v / steps;
115329f1 1504 s->sb_samples[ch][k * 12 + l + 1][i] =
239c2f4c
FB		 1505 l2_unscale_group(steps, v % steps, scale);
1506 v = v / steps;
115329f1 1507 s->sb_samples[ch][k * 12 + l + 2][i] =
239c2f4c
FB		 1508 l2_unscale_group(steps, v, scale);
1509 } else {
1510 for(m=0;m<3;m++) {
1511 v = get_bits(&s->gb, bits);
1512 v = l1_unscale(bits - 1, v, scale);
1513 s->sb_samples[ch][k * 12 + l + m][i] = v;
1514 }
1515 }
1516 } else {
1517 s->sb_samples[ch][k * 12 + l + 0][i] = 0;
1518 s->sb_samples[ch][k * 12 + l + 1][i] = 0;
1519 s->sb_samples[ch][k * 12 + l + 2][i] = 0;
1520 }
1521 }
1522 /* next subband in alloc table */
115329f1 1523 j += 1 << bit_alloc_bits;
239c2f4c
FB		 1524 }
1525 /* XXX: find a way to avoid this duplication of code */
1526 for(i=bound;i<sblimit;i++) {
1527 bit_alloc_bits = alloc_table[j];
1528 b = bit_alloc[0][i];
1529 if (b) {
1530 int mant, scale0, scale1;
1531 scale0 = scale_factors[0][i][k];
1532 scale1 = scale_factors[1][i][k];
1533 qindex = alloc_table[j+b];
1534 bits = quant_bits[qindex];
1535 if (bits < 0) {
1536 /* 3 values at the same time */
1537 v = get_bits(&s->gb, -bits);
1538 steps = quant_steps[qindex];
1539 mant = v % steps;
1540 v = v / steps;
115329f1 1541 s->sb_samples[0][k * 12 + l + 0][i] =
239c2f4c 1542 l2_unscale_group(steps, mant, scale0);
115329f1 1543 s->sb_samples[1][k * 12 + l + 0][i] =
239c2f4c
FB		 1544 l2_unscale_group(steps, mant, scale1);
1545 mant = v % steps;
1546 v = v / steps;
115329f1 1547 s->sb_samples[0][k * 12 + l + 1][i] =
239c2f4c 1548 l2_unscale_group(steps, mant, scale0);
115329f1 1549 s->sb_samples[1][k * 12 + l + 1][i] =
239c2f4c 1550 l2_unscale_group(steps, mant, scale1);
115329f1 1551 s->sb_samples[0][k * 12 + l + 2][i] =
239c2f4c 1552 l2_unscale_group(steps, v, scale0);
115329f1 1553 s->sb_samples[1][k * 12 + l + 2][i] =
239c2f4c
FB		 1554 l2_unscale_group(steps, v, scale1);
1555 } else {
1556 for(m=0;m<3;m++) {
1557 mant = get_bits(&s->gb, bits);
115329f1 1558 s->sb_samples[0][k * 12 + l + m][i] =
239c2f4c 1559 l1_unscale(bits - 1, mant, scale0);
115329f1 1560 s->sb_samples[1][k * 12 + l + m][i] =
239c2f4c
FB		 1561 l1_unscale(bits - 1, mant, scale1);
1562 }
1563 }
1564 } else {
1565 s->sb_samples[0][k * 12 + l + 0][i] = 0;
1566 s->sb_samples[0][k * 12 + l + 1][i] = 0;
1567 s->sb_samples[0][k * 12 + l + 2][i] = 0;
1568 s->sb_samples[1][k * 12 + l + 0][i] = 0;
1569 s->sb_samples[1][k * 12 + l + 1][i] = 0;
1570 s->sb_samples[1][k * 12 + l + 2][i] = 0;
1571 }
1572 /* next subband in alloc table */
115329f1 1573 j += 1 << bit_alloc_bits;
239c2f4c
FB		 1574 }
1575 /* fill remaining samples to zero */
1576 for(i=sblimit;i<SBLIMIT;i++) {
1577 for(ch=0;ch<s->nb_channels;ch++) {
1578 s->sb_samples[ch][k * 12 + l + 0][i] = 0;
1579 s->sb_samples[ch][k * 12 + l + 1][i] = 0;
1580 s->sb_samples[ch][k * 12 + l + 2][i] = 0;
1581 }
1582 }
1583 }
1584 }
1585 return 3 * 12;
de6d9b64
FB		 1586}
1587
1588/*
239c2f4c 1589 * Seek back in the stream for backstep bytes (at most 511 bytes)
de6d9b64 1590 */
5c91a675 1591static void seek_to_maindata(MPADecodeContext *s, unsigned int backstep)
de6d9b64 1592{
0c1a9eda 1593 uint8_t *ptr;
de6d9b64
FB		 1594
1595 /* compute current position in stream */
228ef9dd 1596 ptr = (uint8_t *)(s->gb.buffer + (get_bits_count(&s->gb)>>3));
8db1a1dd 1597
de6d9b64
FB		 1598 /* copy old data before current one */
1599 ptr -= backstep;
115329f1 1600 memcpy(ptr, s->inbuf1[s->inbuf_index ^ 1] +
239c2f4c 1601 BACKSTEP_SIZE + s->old_frame_size - backstep, backstep);
de6d9b64 1602 /* init get bits again */
68f593b4 1603 init_get_bits(&s->gb, ptr, (s->frame_size + backstep)*8);
de6d9b64 1604
239c2f4c
FB		 1605 /* prepare next buffer */
1606 s->inbuf_index ^= 1;
1607 s->inbuf = &s->inbuf1[s->inbuf_index][BACKSTEP_SIZE];
1608 s->old_frame_size = s->frame_size;
1609}
1610
1611static inline void lsf_sf_expand(int *slen,
1612 int sf, int n1, int n2, int n3)
1613{
1614 if (n3) {
1615 slen[3] = sf % n3;
1616 sf /= n3;
1617 } else {
1618 slen[3] = 0;
1619 }
1620 if (n2) {
1621 slen[2] = sf % n2;
1622 sf /= n2;
1623 } else {
1624 slen[2] = 0;
1625 }
1626 slen[1] = sf % n1;
1627 sf /= n1;
1628 slen[0] = sf;
1629}
1630
115329f1 1631static void exponents_from_scale_factors(MPADecodeContext *s,
239c2f4c 1632 GranuleDef *g,
0c1a9eda 1633 int16_t *exponents)
239c2f4c 1634{
0c1a9eda 1635 const uint8_t *bstab, *pretab;
239c2f4c 1636 int len, i, j, k, l, v0, shift, gain, gains[3];
0c1a9eda 1637 int16_t *exp_ptr;
239c2f4c
FB		 1638
1639 exp_ptr = exponents;
1640 gain = g->global_gain - 210;
1641 shift = g->scalefac_scale + 1;
1642
1643 bstab = band_size_long[s->sample_rate_index];
1644 pretab = mpa_pretab[g->preflag];
1645 for(i=0;i<g->long_end;i++) {
1646 v0 = gain - ((g->scale_factors[i] + pretab[i]) << shift);
1647 len = bstab[i];
1648 for(j=len;j>0;j--)
1649 *exp_ptr++ = v0;
1650 }
1651
1652 if (g->short_start < 13) {
1653 bstab = band_size_short[s->sample_rate_index];
1654 gains[0] = gain - (g->subblock_gain[0] << 3);
1655 gains[1] = gain - (g->subblock_gain[1] << 3);
1656 gains[2] = gain - (g->subblock_gain[2] << 3);
1657 k = g->long_end;
1658 for(i=g->short_start;i<13;i++) {
1659 len = bstab[i];
1660 for(l=0;l<3;l++) {
1661 v0 = gains[l] - (g->scale_factors[k++] << shift);
1662 for(j=len;j>0;j--)
1663 *exp_ptr++ = v0;
1664 }
1665 }
1666 }
1667}
1668
1669/* handle n = 0 too */
1670static inline int get_bitsz(GetBitContext *s, int n)
1671{
1672 if (n == 0)
1673 return 0;
1674 else
1675 return get_bits(s, n);
1676}
1677
1678static int huffman_decode(MPADecodeContext *s, GranuleDef *g,
0c1a9eda 1679 int16_t *exponents, int end_pos)
239c2f4c
FB		 1680{
1681 int s_index;
1682 int linbits, code, x, y, l, v, i, j, k, pos;
a08a502e 1683 int last_pos;
239c2f4c 1684 VLC *vlc;
239c2f4c
FB		 1685
1686 /* low frequencies (called big values) */
1687 s_index = 0;
1688 for(i=0;i<3;i++) {
1689 j = g->region_size[i];
1690 if (j == 0)
1691 continue;
1692 /* select vlc table */
1693 k = g->table_select[i];
1694 l = mpa_huff_data[k][0];
1695 linbits = mpa_huff_data[k][1];
1696 vlc = &huff_vlc[l];
239c2f4c 1697
daf4cd9a
MN		 1698 if(!l){
1699 memset(&g->sb_hybrid[s_index], 0, sizeof(*g->sb_hybrid)*j);
1700 s_index += 2*j;
1701 continue;
1702 }
1703
239c2f4c
FB		 1704 /* read huffcode and compute each couple */
1705 for(;j>0;j--) {
1706 if (get_bits_count(&s->gb) >= end_pos)
1707 break;
1f1d675b 1708 y = get_vlc2(&s->gb, vlc->table, 7, 3);
3328ec63
MN		 1709
1710 if(!y){
1711 g->sb_hybrid[s_index ] =
1712 g->sb_hybrid[s_index+1] = 0;
1713 s_index += 2;
1714 continue;
1715 }
1716
daf4cd9a
MN		 1717 x = y >> 4;
1718 y = y & 0x0f;
1719
115329f1 1720 dprintf("region=%d n=%d x=%d y=%d exp=%d\n",
239c2f4c
FB		 1721 i, g->region_size[i] - j, x, y, exponents[s_index]);
1722 if (x) {
55017f35 1723#if 0
239c2f4c
FB		 1724 if (x == 15)
1725 x += get_bitsz(&s->gb, linbits);
1726 v = l3_unscale(x, exponents[s_index]);
55017f35
MN		 1727#else
1728 if (x < 15){
1729 v = expval_table[ exponents[s_index] + 400 ][ x ];
1730 }else{
1731 x += get_bitsz(&s->gb, linbits);
1732 v = l3_unscale(x, exponents[s_index]);
1733 }
1734#endif
239c2f4c
FB		 1735 if (get_bits1(&s->gb))
1736 v = -v;
1737 } else {
1738 v = 0;
1739 }
1740 g->sb_hybrid[s_index++] = v;
1741 if (y) {
55017f35 1742#if 0
239c2f4c
FB		 1743 if (y == 15)
1744 y += get_bitsz(&s->gb, linbits);
1745 v = l3_unscale(y, exponents[s_index]);
55017f35
MN		 1746#else
1747 if (y < 15){
1748 v = expval_table[ exponents[s_index] + 400 ][ y ];
1749 }else{
1750 y += get_bitsz(&s->gb, linbits);
1751 v = l3_unscale(y, exponents[s_index]);
1752 }
1753#endif
239c2f4c
FB		 1754 if (get_bits1(&s->gb))
1755 v = -v;
1756 } else {
1757 v = 0;
1758 }
1759 g->sb_hybrid[s_index++] = v;
1760 }
1761 }
115329f1 1762
239c2f4c
FB		 1763 /* high frequencies */
1764 vlc = &huff_quad_vlc[g->count1table_select];
a08a502e 1765 last_pos=0;
239c2f4c
FB		 1766 while (s_index <= 572) {
1767 pos = get_bits_count(&s->gb);
1768 if (pos >= end_pos) {
a08a502e 1769 if (pos > end_pos && last_pos){
239c2f4c
FB		 1770 /* some encoders generate an incorrect size for this
1771 part. We must go back into the data */
1772 s_index -= 4;
7ca1ed0d
MN		 1773 init_get_bits(&s->gb, s->gb.buffer + 4*(last_pos>>5), s->gb.size_in_bits - (last_pos&(~31)));
1774 skip_bits(&s->gb, last_pos&31);
239c2f4c
FB		 1775 }
1776 break;
1777 }
a08a502e 1778 last_pos= pos;
8db1a1dd 1779
3c693e77 1780 code = get_vlc2(&s->gb, vlc->table, vlc->bits, 1);
239c2f4c 1781 dprintf("t=%d code=%d\n", g->count1table_select, code);
3c693e77
MN		 1782 g->sb_hybrid[s_index+0]=
1783 g->sb_hybrid[s_index+1]=
1784 g->sb_hybrid[s_index+2]=
1785 g->sb_hybrid[s_index+3]= 0;
1786 while(code){
1787 const static int idxtab[16]={3,3,2,2,1,1,1,1,0,0,0,0,0,0,0,0};
1788 int pos= s_index+idxtab[code];
1789 code ^= 8>>idxtab[code];
f8347c41 1790 v = exp_table[ exponents[pos] + 400];
3c693e77
MN		 1791 if(get_bits1(&s->gb))
1792 v = -v;
1793 g->sb_hybrid[pos] = v;
239c2f4c 1794 }
3c693e77 1795 s_index+=4;
239c2f4c 1796 }
daf4cd9a 1797 memset(&g->sb_hybrid[s_index], 0, sizeof(*g->sb_hybrid)*(576 - s_index));
de6d9b64
FB		 1798 return 0;
1799}
1800
239c2f4c
FB		 1801/* Reorder short blocks from bitstream order to interleaved order. It
1802 would be faster to do it in parsing, but the code would be far more
1803 complicated */
1804static void reorder_block(MPADecodeContext *s, GranuleDef *g)
1805{
6430ce0f 1806 int i, j, len;
0c1a9eda
ZK		 1807 int32_t *ptr, *dst, *ptr1;
1808 int32_t tmp[576];
239c2f4c
FB		 1809
1810 if (g->block_type != 2)
1811 return;
1812
1813 if (g->switch_point) {
1814 if (s->sample_rate_index != 8) {
1815 ptr = g->sb_hybrid + 36;
1816 } else {
1817 ptr = g->sb_hybrid + 48;
1818 }
1819 } else {
1820 ptr = g->sb_hybrid;
1821 }
115329f1 1822
239c2f4c
FB		 1823 for(i=g->short_start;i<13;i++) {
1824 len = band_size_short[s->sample_rate_index][i];
1825 ptr1 = ptr;
6430ce0f
MN		 1826 dst = tmp;
1827 for(j=len;j>0;j--) {
1828 *dst++ = ptr[0*len];
1829 *dst++ = ptr[1*len];
1830 *dst++ = ptr[2*len];
1831 ptr++;
239c2f4c 1832 }
6430ce0f
MN		 1833 ptr+=2*len;
1834 memcpy(ptr1, tmp, len * 3 * sizeof(*ptr1));
239c2f4c
FB		 1835 }
1836}
1837
1838#define ISQRT2 FIXR(0.70710678118654752440)
1839
1840static void compute_stereo(MPADecodeContext *s,
1841 GranuleDef *g0, GranuleDef *g1)
1842{
1843 int i, j, k, l;
0c1a9eda 1844 int32_t v1, v2;
239c2f4c 1845 int sf_max, tmp0, tmp1, sf, len, non_zero_found;
0c1a9eda
ZK		 1846 int32_t (*is_tab)[16];
1847 int32_t *tab0, *tab1;
239c2f4c
FB		 1848 int non_zero_found_short[3];
1849
1850 /* intensity stereo */
1851 if (s->mode_ext & MODE_EXT_I_STEREO) {
1852 if (!s->lsf) {
1853 is_tab = is_table;
1854 sf_max = 7;
1855 } else {
1856 is_tab = is_table_lsf[g1->scalefac_compress & 1];
1857 sf_max = 16;
1858 }
115329f1 1859
239c2f4c
FB		 1860 tab0 = g0->sb_hybrid + 576;
1861 tab1 = g1->sb_hybrid + 576;
1862
1863 non_zero_found_short[0] = 0;
1864 non_zero_found_short[1] = 0;
1865 non_zero_found_short[2] = 0;
1866 k = (13 - g1->short_start) * 3 + g1->long_end - 3;
1867 for(i = 12;i >= g1->short_start;i--) {
1868 /* for last band, use previous scale factor */
1869 if (i != 11)
1870 k -= 3;
1871 len = band_size_short[s->sample_rate_index][i];
1872 for(l=2;l>=0;l--) {
1873 tab0 -= len;
1874 tab1 -= len;
1875 if (!non_zero_found_short[l]) {
1876 /* test if non zero band. if so, stop doing i-stereo */
1877 for(j=0;j<len;j++) {
1878 if (tab1[j] != 0) {
1879 non_zero_found_short[l] = 1;
1880 goto found1;
1881 }
1882 }
1883 sf = g1->scale_factors[k + l];
1884 if (sf >= sf_max)
1885 goto found1;
1886
1887 v1 = is_tab[0][sf];
1888 v2 = is_tab[1][sf];
1889 for(j=0;j<len;j++) {
1890 tmp0 = tab0[j];
1891 tab0[j] = MULL(tmp0, v1);
1892 tab1[j] = MULL(tmp0, v2);
1893 }
1894 } else {
1895 found1:
1896 if (s->mode_ext & MODE_EXT_MS_STEREO) {
1897 /* lower part of the spectrum : do ms stereo
1898 if enabled */
1899 for(j=0;j<len;j++) {
1900 tmp0 = tab0[j];
1901 tmp1 = tab1[j];
1902 tab0[j] = MULL(tmp0 + tmp1, ISQRT2);
1903 tab1[j] = MULL(tmp0 - tmp1, ISQRT2);
1904 }
1905 }
1906 }
1907 }
1908 }
1909
115329f1
DB		 1910 non_zero_found = non_zero_found_short[0] |
1911 non_zero_found_short[1] |
239c2f4c
FB		 1912 non_zero_found_short[2];
1913
1914 for(i = g1->long_end - 1;i >= 0;i--) {
1915 len = band_size_long[s->sample_rate_index][i];
1916 tab0 -= len;
1917 tab1 -= len;
1918 /* test if non zero band. if so, stop doing i-stereo */
1919 if (!non_zero_found) {
1920 for(j=0;j<len;j++) {
1921 if (tab1[j] != 0) {
1922 non_zero_found = 1;
1923 goto found2;
1924 }
1925 }
1926 /* for last band, use previous scale factor */
1927 k = (i == 21) ? 20 : i;
1928 sf = g1->scale_factors[k];
1929 if (sf >= sf_max)
1930 goto found2;
1931 v1 = is_tab[0][sf];
1932 v2 = is_tab[1][sf];
1933 for(j=0;j<len;j++) {
1934 tmp0 = tab0[j];
1935 tab0[j] = MULL(tmp0, v1);
1936 tab1[j] = MULL(tmp0, v2);
1937 }
1938 } else {
1939 found2:
1940 if (s->mode_ext & MODE_EXT_MS_STEREO) {
1941 /* lower part of the spectrum : do ms stereo
1942 if enabled */
1943 for(j=0;j<len;j++) {
1944 tmp0 = tab0[j];
1945 tmp1 = tab1[j];
1946 tab0[j] = MULL(tmp0 + tmp1, ISQRT2);
1947 tab1[j] = MULL(tmp0 - tmp1, ISQRT2);
1948 }
1949 }
1950 }
1951 }
1952 } else if (s->mode_ext & MODE_EXT_MS_STEREO) {
1953 /* ms stereo ONLY */
1954 /* NOTE: the 1/sqrt(2) normalization factor is included in the
1955 global gain */
1956 tab0 = g0->sb_hybrid;
1957 tab1 = g1->sb_hybrid;
1958 for(i=0;i<576;i++) {
1959 tmp0 = tab0[i];
1960 tmp1 = tab1[i];
1961 tab0[i] = tmp0 + tmp1;
1962 tab1[i] = tmp0 - tmp1;
1963 }
1964 }
1965}
1966
a1e257b2 1967static void compute_antialias_integer(MPADecodeContext *s,
239c2f4c
FB		 1968 GranuleDef *g)
1969{
ce4a29c0
MN		 1970 int32_t *ptr, *csa;
1971 int n, i;
239c2f4c
FB		 1972
1973 /* we antialias only "long" bands */
1974 if (g->block_type == 2) {
1975 if (!g->switch_point)
1976 return;
1977 /* XXX: check this for 8000Hz case */
1978 n = 1;
1979 } else {
1980 n = SBLIMIT - 1;
1981 }
115329f1 1982
239c2f4c
FB		 1983 ptr = g->sb_hybrid + 18;
1984 for(i = n;i > 0;i--) {
ce4a29c0
MN		 1985 int tmp0, tmp1, tmp2;
1986 csa = &csa_table[0][0];
1987#define INT_AA(j) \
44f1698a
MN		 1988 tmp0 = ptr[-1-j];\
1989 tmp1 = ptr[ j];\
ce4a29c0 1990 tmp2= MULH(tmp0 + tmp1, csa[0+4*j]);\
44f1698a
MN		 1991 ptr[-1-j] = 4*(tmp2 - MULH(tmp1, csa[2+4*j]));\
1992 ptr[ j] = 4*(tmp2 + MULH(tmp0, csa[3+4*j]));
ce4a29c0
MN		 1993
1994 INT_AA(0)
1995 INT_AA(1)
1996 INT_AA(2)
1997 INT_AA(3)
1998 INT_AA(4)
1999 INT_AA(5)
2000 INT_AA(6)
2001 INT_AA(7)
115329f1
DB		 2002
2003 ptr += 18;
a1e257b2
MN		 2004 }
2005}
2006
2007static void compute_antialias_float(MPADecodeContext *s,
2008 GranuleDef *g)
2009{
ce4a29c0
MN		 2010 int32_t *ptr;
2011 int n, i;
a1e257b2
MN		 2012
2013 /* we antialias only "long" bands */
2014 if (g->block_type == 2) {
2015 if (!g->switch_point)
2016 return;
2017 /* XXX: check this for 8000Hz case */
2018 n = 1;
2019 } else {
2020 n = SBLIMIT - 1;
2021 }
115329f1 2022
a1e257b2
MN		 2023 ptr = g->sb_hybrid + 18;
2024 for(i = n;i > 0;i--) {
ce4a29c0 2025 float tmp0, tmp1;
115329f1 2026 float *csa = &csa_table_float[0][0];
ce4a29c0
MN		 2027#define FLOAT_AA(j)\
2028 tmp0= ptr[-1-j];\
2029 tmp1= ptr[ j];\
2030 ptr[-1-j] = lrintf(tmp0 * csa[0+4*j] - tmp1 * csa[1+4*j]);\
2031 ptr[ j] = lrintf(tmp0 * csa[1+4*j] + tmp1 * csa[0+4*j]);
115329f1 2032
ce4a29c0
MN		 2033 FLOAT_AA(0)
2034 FLOAT_AA(1)
2035 FLOAT_AA(2)
2036 FLOAT_AA(3)
2037 FLOAT_AA(4)
2038 FLOAT_AA(5)
2039 FLOAT_AA(6)
2040 FLOAT_AA(7)
2041
115329f1 2042 ptr += 18;
239c2f4c
FB		 2043 }
2044}
2045
2046static void compute_imdct(MPADecodeContext *s,
115329f1 2047 GranuleDef *g,
0c1a9eda
ZK		 2048 int32_t *sb_samples,
2049 int32_t *mdct_buf)
239c2f4c 2050{
125d6246 2051 int32_t *ptr, *win, *win1, *buf, *out_ptr, *ptr1;
0c1a9eda 2052 int32_t out2[12];
125d6246 2053 int i, j, mdct_long_end, v, sblimit;
239c2f4c
FB		 2054
2055 /* find last non zero block */
2056 ptr = g->sb_hybrid + 576;
2057 ptr1 = g->sb_hybrid + 2 * 18;
2058 while (ptr >= ptr1) {
2059 ptr -= 6;
2060 v = ptr[0] | ptr[1] | ptr[2] | ptr[3] | ptr[4] | ptr[5];
2061 if (v != 0)
2062 break;
2063 }
2064 sblimit = ((ptr - g->sb_hybrid) / 18) + 1;
2065
2066 if (g->block_type == 2) {
2067 /* XXX: check for 8000 Hz */
2068 if (g->switch_point)
2069 mdct_long_end = 2;
2070 else
2071 mdct_long_end = 0;
2072 } else {
2073 mdct_long_end = sblimit;
2074 }
2075
2076 buf = mdct_buf;
2077 ptr = g->sb_hybrid;
2078 for(j=0;j<mdct_long_end;j++) {
239c2f4c
FB		 2079 /* apply window & overlap with previous buffer */
2080 out_ptr = sb_samples + j;
2081 /* select window */
2082 if (g->switch_point && j < 2)
2083 win1 = mdct_win[0];
2084 else
2085 win1 = mdct_win[g->block_type];
2086 /* select frequency inversion */
2087 win = win1 + ((4 * 36) & -(j & 1));
711ae726
MN		 2088 imdct36(out_ptr, buf, ptr, win);
2089 out_ptr += 18*SBLIMIT;
239c2f4c
FB		 2090 ptr += 18;
2091 buf += 18;
2092 }
2093 for(j=mdct_long_end;j<sblimit;j++) {
239c2f4c
FB		 2094 /* select frequency inversion */
2095 win = mdct_win[2] + ((4 * 36) & -(j & 1));
239c2f4c 2096 out_ptr = sb_samples + j;
115329f1 2097
125d6246
MN		 2098 for(i=0; i<6; i++){
2099 *out_ptr = buf[i];
2100 out_ptr += SBLIMIT;
2101 }
2102 imdct12(out2, ptr + 0);
2103 for(i=0;i<6;i++) {
2104 *out_ptr = MULH(out2[i], win[i]) + buf[i + 6*1];
2105 buf[i + 6*2] = MULH(out2[i + 6], win[i + 6]);
239c2f4c
FB		 2106 out_ptr += SBLIMIT;
2107 }
125d6246
MN		 2108 imdct12(out2, ptr + 1);
2109 for(i=0;i<6;i++) {
2110 *out_ptr = MULH(out2[i], win[i]) + buf[i + 6*2];
2111 buf[i + 6*0] = MULH(out2[i + 6], win[i + 6]);
2112 out_ptr += SBLIMIT;
2113 }
2114 imdct12(out2, ptr + 2);
2115 for(i=0;i<6;i++) {
2116 buf[i + 6*0] = MULH(out2[i], win[i]) + buf[i + 6*0];
2117 buf[i + 6*1] = MULH(out2[i + 6], win[i + 6]);
2118 buf[i + 6*2] = 0;
2119 }
239c2f4c
FB		 2120 ptr += 18;
2121 buf += 18;
2122 }
2123 /* zero bands */
2124 for(j=sblimit;j<SBLIMIT;j++) {
2125 /* overlap */
2126 out_ptr = sb_samples + j;
2127 for(i=0;i<18;i++) {
2128 *out_ptr = buf[i];
2129 buf[i] = 0;
2130 out_ptr += SBLIMIT;
2131 }
2132 buf += 18;
2133 }
2134}
2135
747a67fb 2136#if defined(DEBUG)
0c1a9eda 2137void sample_dump(int fnum, int32_t *tab, int n)
239c2f4c
FB		 2138{
2139 static FILE *files[16], *f;
2140 char buf[512];
81552334 2141 int i;
0c1a9eda 2142 int32_t v;
115329f1 2143
239c2f4c
FB		 2144 f = files[fnum];
2145 if (!f) {
115329f1
DB		 2146 snprintf(buf, sizeof(buf), "/tmp/out%d.%s.pcm",
2147 fnum,
81552334
FB		 2148#ifdef USE_HIGHPRECISION
2149 "hp"
2150#else
2151 "lp"
2152#endif
2153 );
239c2f4c
FB		 2154 f = fopen(buf, "w");
2155 if (!f)
2156 return;
2157 files[fnum] = f;
2158 }
115329f1 2159
239c2f4c 2160 if (fnum == 0) {
239c2f4c 2161 static int pos = 0;
84af4a7e 2162 av_log(NULL, AV_LOG_DEBUG, "pos=%d\n", pos);
239c2f4c 2163 for(i=0;i<n;i++) {
84af4a7e 2164 av_log(NULL, AV_LOG_DEBUG, " %0.4f", (double)tab[i] / FRAC_ONE);
239c2f4c 2165 if ((i % 18) == 17)
84af4a7e 2166 av_log(NULL, AV_LOG_DEBUG, "\n");
239c2f4c
FB		 2167 }
2168 pos += n;
2169 }
81552334
FB		 2170 for(i=0;i<n;i++) {
2171 /* normalize to 23 frac bits */
2172 v = tab[i] << (23 - FRAC_BITS);
0c1a9eda 2173 fwrite(&v, 1, sizeof(int32_t), f);
81552334 2174 }
239c2f4c
FB		 2175}
2176#endif
2177
2178
2179/* main layer3 decoding function */
2180static int mp_decode_layer3(MPADecodeContext *s)
2181{
2182 int nb_granules, main_data_begin, private_bits;
2183 int gr, ch, blocksplit_flag, i, j, k, n, bits_pos, bits_left;
2184 GranuleDef granules[2][2], *g;
0c1a9eda 2185 int16_t exponents[576];
239c2f4c
FB		 2186
2187 /* read side info */
2188 if (s->lsf) {
2189 main_data_begin = get_bits(&s->gb, 8);
a753e55b 2190 private_bits = get_bits(&s->gb, s->nb_channels);
239c2f4c
FB		 2191 nb_granules = 1;
2192 } else {
2193 main_data_begin = get_bits(&s->gb, 9);
2194 if (s->nb_channels == 2)
2195 private_bits = get_bits(&s->gb, 3);
2196 else
2197 private_bits = get_bits(&s->gb, 5);
2198 nb_granules = 2;
2199 for(ch=0;ch<s->nb_channels;ch++) {
2200 granules[ch][0].scfsi = 0; /* all scale factors are transmitted */
2201 granules[ch][1].scfsi = get_bits(&s->gb, 4);
2202 }
2203 }
115329f1 2204
239c2f4c
FB		 2205 for(gr=0;gr<nb_granules;gr++) {
2206 for(ch=0;ch<s->nb_channels;ch++) {
2207 dprintf("gr=%d ch=%d: side_info\n", gr, ch);
2208 g = &granules[ch][gr];
2209 g->part2_3_length = get_bits(&s->gb, 12);
2210 g->big_values = get_bits(&s->gb, 9);
2211 g->global_gain = get_bits(&s->gb, 8);
2212 /* if MS stereo only is selected, we precompute the
2213 1/sqrt(2) renormalization factor */
115329f1 2214 if ((s->mode_ext & (MODE_EXT_MS_STEREO | MODE_EXT_I_STEREO)) ==
239c2f4c
FB		 2215 MODE_EXT_MS_STEREO)
2216 g->global_gain -= 2;
2217 if (s->lsf)
2218 g->scalefac_compress = get_bits(&s->gb, 9);
2219 else
2220 g->scalefac_compress = get_bits(&s->gb, 4);
2221 blocksplit_flag = get_bits(&s->gb, 1);
2222 if (blocksplit_flag) {
2223 g->block_type = get_bits(&s->gb, 2);
2224 if (g->block_type == 0)
2225 return -1;
2226 g->switch_point = get_bits(&s->gb, 1);
2227 for(i=0;i<2;i++)
2228 g->table_select[i] = get_bits(&s->gb, 5);
115329f1 2229 for(i=0;i<3;i++)
239c2f4c
FB		 2230 g->subblock_gain[i] = get_bits(&s->gb, 3);
2231 /* compute huffman coded region sizes */
2232 if (g->block_type == 2)
2233 g->region_size[0] = (36 / 2);
2234 else {
115329f1 2235 if (s->sample_rate_index <= 2)
239c2f4c 2236 g->region_size[0] = (36 / 2);
115329f1 2237 else if (s->sample_rate_index != 8)
239c2f4c
FB		 2238 g->region_size[0] = (54 / 2);
2239 else
2240 g->region_size[0] = (108 / 2);
2241 }
2242 g->region_size[1] = (576 / 2);
2243 } else {
2244 int region_address1, region_address2, l;
2245 g->block_type = 0;
2246 g->switch_point = 0;
2247 for(i=0;i<3;i++)
2248 g->table_select[i] = get_bits(&s->gb, 5);
2249 /* compute huffman coded region sizes */
2250 region_address1 = get_bits(&s->gb, 4);
2251 region_address2 = get_bits(&s->gb, 3);
115329f1 2252 dprintf("region1=%d region2=%d\n",
239c2f4c 2253 region_address1, region_address2);
115329f1 2254 g->region_size[0] =
239c2f4c
FB		 2255 band_index_long[s->sample_rate_index][region_address1 + 1] >> 1;
2256 l = region_address1 + region_address2 + 2;
2257 /* should not overflow */
2258 if (l > 22)
2259 l = 22;
115329f1 2260 g->region_size[1] =
239c2f4c
FB		 2261 band_index_long[s->sample_rate_index][l] >> 1;
2262 }
2263 /* convert region offsets to region sizes and truncate
2264 size to big_values */
2265 g->region_size[2] = (576 / 2);
2266 j = 0;
2267 for(i=0;i<3;i++) {
c7aa3696 2268 k = FFMIN(g->region_size[i], g->big_values);
239c2f4c
FB		 2269 g->region_size[i] = k - j;
2270 j = k;
2271 }
2272
2273 /* compute band indexes */
2274 if (g->block_type == 2) {
2275 if (g->switch_point) {
2276 /* if switched mode, we handle the 36 first samples as
2277 long blocks. For 8000Hz, we handle the 48 first
2278 exponents as long blocks (XXX: check this!) */
2279 if (s->sample_rate_index <= 2)
2280 g->long_end = 8;
2281 else if (s->sample_rate_index != 8)
2282 g->long_end = 6;
2283 else
2284 g->long_end = 4; /* 8000 Hz */
115329f1 2285
c7aa3696 2286 g->short_start = 2 + (s->sample_rate_index != 8);
239c2f4c
FB		 2287 } else {
2288 g->long_end = 0;
2289 g->short_start = 0;
2290 }
2291 } else {
2292 g->short_start = 13;
2293 g->long_end = 22;
2294 }
115329f1 2295
239c2f4c
FB		 2296 g->preflag = 0;
2297 if (!s->lsf)
2298 g->preflag = get_bits(&s->gb, 1);
2299 g->scalefac_scale = get_bits(&s->gb, 1);
2300 g->count1table_select = get_bits(&s->gb, 1);
2301 dprintf("block_type=%d switch_point=%d\n",
2302 g->block_type, g->switch_point);
2303 }
2304 }
2305
1ede228a 2306 if (!s->adu_mode) {
239c2f4c
FB		 2307 /* now we get bits from the main_data_begin offset */
2308 dprintf("seekback: %d\n", main_data_begin);
2309 seek_to_maindata(s, main_data_begin);
1ede228a 2310 }
239c2f4c
FB		 2311
2312 for(gr=0;gr<nb_granules;gr++) {
2313 for(ch=0;ch<s->nb_channels;ch++) {
2314 g = &granules[ch][gr];
115329f1 2315
239c2f4c 2316 bits_pos = get_bits_count(&s->gb);
115329f1 2317
239c2f4c 2318 if (!s->lsf) {
0c1a9eda 2319 uint8_t *sc;
239c2f4c
FB		 2320 int slen, slen1, slen2;
2321
2322 /* MPEG1 scale factors */
2323 slen1 = slen_table[0][g->scalefac_compress];
2324 slen2 = slen_table[1][g->scalefac_compress];
2325 dprintf("slen1=%d slen2=%d\n", slen1, slen2);
2326 if (g->block_type == 2) {
2327 n = g->switch_point ? 17 : 18;
2328 j = 0;
e90a7270
MN		 2329 if(slen1){
2330 for(i=0;i<n;i++)
2331 g->scale_factors[j++] = get_bits(&s->gb, slen1);
2332 }else{
2333 for(i=0;i<n;i++)
2334 g->scale_factors[j++] = 0;
2335 }
2336 if(slen2){
2337 for(i=0;i<18;i++)
2338 g->scale_factors[j++] = get_bits(&s->gb, slen2);
2339 for(i=0;i<3;i++)
2340 g->scale_factors[j++] = 0;
2341 }else{
2342 for(i=0;i<21;i++)
2343 g->scale_factors[j++] = 0;
2344 }
239c2f4c
FB		 2345 } else {
2346 sc = granules[ch][0].scale_factors;
2347 j = 0;
2348 for(k=0;k<4;k++) {
2349 n = (k == 0 ? 6 : 5);
2350 if ((g->scfsi & (0x8 >> k)) == 0) {
2351 slen = (k < 2) ? slen1 : slen2;
e90a7270
MN		 2352 if(slen){
2353 for(i=0;i<n;i++)
2354 g->scale_factors[j++] = get_bits(&s->gb, slen);
2355 }else{
2356 for(i=0;i<n;i++)
2357 g->scale_factors[j++] = 0;
2358 }
239c2f4c
FB		 2359 } else {
2360 /* simply copy from last granule */
2361 for(i=0;i<n;i++) {
2362 g->scale_factors[j] = sc[j];
2363 j++;
2364 }
2365 }
2366 }
2367 g->scale_factors[j++] = 0;
2368 }
747a67fb 2369#if defined(DEBUG)
239c2f4c 2370 {
267f7edc 2371 dprintf("scfsi=%x gr=%d ch=%d scale_factors:\n",
239c2f4c
FB		 2372 g->scfsi, gr, ch);
2373 for(i=0;i<j;i++)
267f7edc
SH		 2374 dprintf(" %d", g->scale_factors[i]);
2375 dprintf("\n");
239c2f4c
FB		 2376 }
2377#endif
2378 } else {
2379 int tindex, tindex2, slen[4], sl, sf;
2380
2381 /* LSF scale factors */
2382 if (g->block_type == 2) {
2383 tindex = g->switch_point ? 2 : 1;
2384 } else {
2385 tindex = 0;
2386 }
2387 sf = g->scalefac_compress;
2388 if ((s->mode_ext & MODE_EXT_I_STEREO) && ch == 1) {
2389 /* intensity stereo case */
2390 sf >>= 1;
2391 if (sf < 180) {
2392 lsf_sf_expand(slen, sf, 6, 6, 0);
2393 tindex2 = 3;
2394 } else if (sf < 244) {
2395 lsf_sf_expand(slen, sf - 180, 4, 4, 0);
2396 tindex2 = 4;
2397 } else {
2398 lsf_sf_expand(slen, sf - 244, 3, 0, 0);
2399 tindex2 = 5;
2400 }
2401 } else {
2402 /* normal case */
2403 if (sf < 400) {
2404 lsf_sf_expand(slen, sf, 5, 4, 4);
2405 tindex2 = 0;
2406 } else if (sf < 500) {
2407 lsf_sf_expand(slen, sf - 400, 5, 4, 0);
2408 tindex2 = 1;
2409 } else {
2410 lsf_sf_expand(slen, sf - 500, 3, 0, 0);
2411 tindex2 = 2;
2412 g->preflag = 1;
2413 }
2414 }
2415
2416 j = 0;
2417 for(k=0;k<4;k++) {
2418 n = lsf_nsf_table[tindex2][tindex][k];
2419 sl = slen[k];
92c5cb62 2420 if(sl){
e90a7270
MN		 2421 for(i=0;i<n;i++)
2422 g->scale_factors[j++] = get_bits(&s->gb, sl);
2423 }else{
2424 for(i=0;i<n;i++)
2425 g->scale_factors[j++] = 0;
2426 }
239c2f4c
FB		 2427 }
2428 /* XXX: should compute exact size */
2429 for(;j<40;j++)
2430 g->scale_factors[j] = 0;
747a67fb 2431#if defined(DEBUG)
239c2f4c 2432 {
267f7edc 2433 dprintf("gr=%d ch=%d scale_factors:\n",
239c2f4c
FB		 2434 gr, ch);
2435 for(i=0;i<40;i++)
267f7edc
SH		 2436 dprintf(" %d", g->scale_factors[i]);
2437 dprintf("\n");
239c2f4c
FB		 2438 }
2439#endif
2440 }
2441
2442 exponents_from_scale_factors(s, g, exponents);
2443
2444 /* read Huffman coded residue */
2445 if (huffman_decode(s, g, exponents,
2446 bits_pos + g->part2_3_length) < 0)
2447 return -1;
747a67fb
FB		 2448#if defined(DEBUG)
2449 sample_dump(0, g->sb_hybrid, 576);
239c2f4c
FB		 2450#endif
2451
2452 /* skip extension bits */
2453 bits_left = g->part2_3_length - (get_bits_count(&s->gb) - bits_pos);
2454 if (bits_left < 0) {
2455 dprintf("bits_left=%d\n", bits_left);
2456 return -1;
2457 }
2458 while (bits_left >= 16) {
2459 skip_bits(&s->gb, 16);
2460 bits_left -= 16;
2461 }
2462 if (bits_left > 0)
2463 skip_bits(&s->gb, bits_left);
2464 } /* ch */
2465
2466 if (s->nb_channels == 2)
2467 compute_stereo(s, &granules[0][gr], &granules[1][gr]);
2468
2469 for(ch=0;ch<s->nb_channels;ch++) {
2470 g = &granules[ch][gr];
2471
2472 reorder_block(s, g);
747a67fb 2473#if defined(DEBUG)
239c2f4c
FB		 2474 sample_dump(0, g->sb_hybrid, 576);
2475#endif
a1e257b2 2476 s->compute_antialias(s, g);
81552334 2477#if defined(DEBUG)
239c2f4c
FB		 2478 sample_dump(1, g->sb_hybrid, 576);
2479#endif
115329f1 2480 compute_imdct(s, g, &s->sb_samples[ch][18 * gr][0], s->mdct_buf[ch]);
81552334 2481#if defined(DEBUG)
239c2f4c
FB		 2482 sample_dump(2, &s->sb_samples[ch][18 * gr][0], 576);
2483#endif
2484 }
2485 } /* gr */
2486 return nb_granules * 18;
2487}
2488
115329f1 2489static int mp_decode_frame(MPADecodeContext *s,
a3a5f4d6 2490 OUT_INT *samples)
239c2f4c
FB		 2491{
2492 int i, nb_frames, ch;
a3a5f4d6 2493 OUT_INT *samples_ptr;
239c2f4c 2494
115329f1 2495 init_get_bits(&s->gb, s->inbuf + HEADER_SIZE,
68f593b4 2496 (s->inbuf_ptr - s->inbuf - HEADER_SIZE)*8);
115329f1 2497
239c2f4c
FB		 2498 /* skip error protection field */
2499 if (s->error_protection)
2500 get_bits(&s->gb, 16);
2501
2502 dprintf("frame %d:\n", s->frame_count);
2503 switch(s->layer) {
2504 case 1:
2505 nb_frames = mp_decode_layer1(s);
2506 break;
2507 case 2:
2508 nb_frames = mp_decode_layer2(s);
2509 break;
2510 case 3:
2511 default:
2512 nb_frames = mp_decode_layer3(s);
2513 break;
2514 }
2515#if defined(DEBUG)
2516 for(i=0;i<nb_frames;i++) {
2517 for(ch=0;ch<s->nb_channels;ch++) {
2518 int j;
267f7edc 2519 dprintf("%d-%d:", i, ch);
239c2f4c 2520 for(j=0;j<SBLIMIT;j++)
267f7edc
SH		 2521 dprintf(" %0.6f", (double)s->sb_samples[ch][i][j] / FRAC_ONE);
2522 dprintf("\n");
239c2f4c
FB		 2523 }
2524 }
2525#endif
2526 /* apply the synthesis filter */
2527 for(ch=0;ch<s->nb_channels;ch++) {
2528 samples_ptr = samples + ch;
2529 for(i=0;i<nb_frames;i++) {
bf1f4da0 2530 ff_mpa_synth_filter(s->synth_buf[ch], &(s->synth_buf_offset[ch]),
bb270c08
DB		 2531 window, &s->dither_state,
2532 samples_ptr, s->nb_channels,
239c2f4c
FB		 2533 s->sb_samples[ch][i]);
2534 samples_ptr += 32 * s->nb_channels;
2535 }
2536 }
2537#ifdef DEBUG
115329f1 2538 s->frame_count++;
239c2f4c 2539#endif
a3a5f4d6 2540 return nb_frames * 32 * sizeof(OUT_INT) * s->nb_channels;
239c2f4c
FB		 2541}
2542
de6d9b64 2543static int decode_frame(AVCodecContext * avctx,
bb270c08
DB		 2544 void *data, int *data_size,
2545 uint8_t * buf, int buf_size)
de6d9b64
FB		 2546{
2547 MPADecodeContext *s = avctx->priv_data;
0c1a9eda
ZK		 2548 uint32_t header;
2549 uint8_t *buf_ptr;
de6d9b64 2550 int len, out_size;
a3a5f4d6 2551 OUT_INT *out_samples = data;
de6d9b64 2552
de6d9b64
FB		 2553 buf_ptr = buf;
2554 while (buf_size > 0) {
bb270c08
DB		 2555 len = s->inbuf_ptr - s->inbuf;
2556 if (s->frame_size == 0) {
239c2f4c
FB		 2557 /* special case for next header for first frame in free
2558 format case (XXX: find a simpler method) */
2559 if (s->free_format_next_header != 0) {
2560 s->inbuf[0] = s->free_format_next_header >> 24;
2561 s->inbuf[1] = s->free_format_next_header >> 16;
2562 s->inbuf[2] = s->free_format_next_header >> 8;
2563 s->inbuf[3] = s->free_format_next_header;
2564 s->inbuf_ptr = s->inbuf + 4;
2565 s->free_format_next_header = 0;
2566 goto got_header;
2567 }
bb270c08 2568 /* no header seen : find one. We need at least HEADER_SIZE
239c2f4c 2569 bytes to parse it */
bb270c08
DB		 2570 len = HEADER_SIZE - len;
2571 if (len > buf_size)
2572 len = buf_size;
2573 if (len > 0) {
2574 memcpy(s->inbuf_ptr, buf_ptr, len);
2575 buf_ptr += len;
2576 buf_size -= len;
2577 s->inbuf_ptr += len;
2578 }
2579 if ((s->inbuf_ptr - s->inbuf) >= HEADER_SIZE) {
239c2f4c 2580 got_header:
bb270c08
DB		 2581 header = (s->inbuf[0] << 24) | (s->inbuf[1] << 16) |
2582 (s->inbuf[2] << 8) | s->inbuf[3];
92d24f49 2583
bb270c08
DB		 2584 if (ff_mpa_check_header(header) < 0) {
2585 /* no sync found : move by one byte (inefficient, but simple!) */
2586 memmove(s->inbuf, s->inbuf + 1, s->inbuf_ptr - s->inbuf - 1);
2587 s->inbuf_ptr--;
239c2f4c
FB		 2588 dprintf("skip %x\n", header);
2589 /* reset free format frame size to give a chance
2590 to get a new bitrate */
2591 s->free_format_frame_size = 0;
bb270c08
DB		 2592 } else {
2593 if (decode_header(s, header) == 1) {
81552334 2594 /* free format: prepare to compute frame size */
bb270c08 2595 s->frame_size = -1;
239c2f4c 2596 }
81552334
FB		 2597 /* update codec info */
2598 avctx->sample_rate = s->sample_rate;
2599 avctx->channels = s->nb_channels;
2600 avctx->bit_rate = s->bit_rate;
98ce5991 2601 avctx->sub_id = s->layer;
8c5b5683
FB		 2602 switch(s->layer) {
2603 case 1:
2604 avctx->frame_size = 384;
2605 break;
2606 case 2:
2607 avctx->frame_size = 1152;
2608 break;
2609 case 3:
2610 if (s->lsf)
2611 avctx->frame_size = 576;
2612 else
2613 avctx->frame_size = 1152;
2614 break;
2615 }
bb270c08
DB		 2616 }
2617 }
239c2f4c
FB		 2618 } else if (s->frame_size == -1) {
2619 /* free format : find next sync to compute frame size */
bb270c08
DB		 2620 len = MPA_MAX_CODED_FRAME_SIZE - len;
2621 if (len > buf_size)
2622 len = buf_size;
239c2f4c 2623 if (len == 0) {
bb270c08 2624 /* frame too long: resync */
239c2f4c 2625 s->frame_size = 0;
bb270c08
DB		 2626 memmove(s->inbuf, s->inbuf + 1, s->inbuf_ptr - s->inbuf - 1);
2627 s->inbuf_ptr--;
239c2f4c 2628 } else {
0c1a9eda
ZK		 2629 uint8_t *p, *pend;
2630 uint32_t header1;
239c2f4c
FB		 2631 int padding;
2632
2633 memcpy(s->inbuf_ptr, buf_ptr, len);
2634 /* check for header */
2635 p = s->inbuf_ptr - 3;
2636 pend = s->inbuf_ptr + len - 4;
2637 while (p <= pend) {
2638 header = (p[0] << 24) | (p[1] << 16) |
2639 (p[2] << 8) | p[3];
2640 header1 = (s->inbuf[0] << 24) | (s->inbuf[1] << 16) |
2641 (s->inbuf[2] << 8) | s->inbuf[3];
2642 /* check with high probability that we have a
2643 valid header */
2644 if ((header & SAME_HEADER_MASK) ==
2645 (header1 & SAME_HEADER_MASK)) {
2646 /* header found: update pointers */
2647 len = (p + 4) - s->inbuf_ptr;
2648 buf_ptr += len;
2649 buf_size -= len;
2650 s->inbuf_ptr = p;
2651 /* compute frame size */
2652 s->free_format_next_header = header;
2653 s->free_format_frame_size = s->inbuf_ptr - s->inbuf;
2654 padding = (header1 >> 9) & 1;
2655 if (s->layer == 1)
2656 s->free_format_frame_size -= padding * 4;
2657 else
2658 s->free_format_frame_size -= padding;
115329f1 2659 dprintf("free frame size=%d padding=%d\n",
239c2f4c
FB		 2660 s->free_format_frame_size, padding);
2661 decode_header(s, header1);
2662 goto next_data;
2663 }
2664 p++;
2665 }
2666 /* not found: simply increase pointers */
2667 buf_ptr += len;
2668 s->inbuf_ptr += len;
2669 buf_size -= len;
2670 }
bb270c08 2671 } else if (len < s->frame_size) {
de5123dc
ZK		 2672 if (s->frame_size > MPA_MAX_CODED_FRAME_SIZE)
2673 s->frame_size = MPA_MAX_CODED_FRAME_SIZE;
bb270c08
DB		 2674 len = s->frame_size - len;
2675 if (len > buf_size)
2676 len = buf_size;
2677 memcpy(s->inbuf_ptr, buf_ptr, len);
2678 buf_ptr += len;
2679 s->inbuf_ptr += len;
2680 buf_size -= len;
2681 }
8c5b5683 2682 next_data:
115329f1 2683 if (s->frame_size > 0 &&
8c5b5683
FB		 2684 (s->inbuf_ptr - s->inbuf) >= s->frame_size) {
2685 if (avctx->parse_only) {
2686 /* simply return the frame data */
2687 *(uint8_t **)data = s->inbuf;
2688 out_size = s->inbuf_ptr - s->inbuf;
2689 } else {
2690 out_size = mp_decode_frame(s, out_samples);
2691 }
bb270c08
DB		 2692 s->inbuf_ptr = s->inbuf;
2693 s->frame_size = 0;
02af2269 2694 if(out_size>=0)
bb270c08 2695 *data_size = out_size;
02af2269
MN		 2696 else
2697 av_log(avctx, AV_LOG_DEBUG, "Error while decoding mpeg audio frame\n"); //FIXME return -1 / but also return the number of bytes consumed
bb270c08
DB		 2698 break;
2699 }
de6d9b64
FB		 2700 }
2701 return buf_ptr - buf;
2702}
2703
1ede228a
RT		 2704
2705static int decode_frame_adu(AVCodecContext * avctx,
bb270c08
DB		 2706 void *data, int *data_size,
2707 uint8_t * buf, int buf_size)
1ede228a
RT		 2708{
2709 MPADecodeContext *s = avctx->priv_data;
2710 uint32_t header;
2711 int len, out_size;
a3a5f4d6 2712 OUT_INT *out_samples = data;
1ede228a
RT		 2713
2714 len = buf_size;
2715
2716 // Discard too short frames
2717 if (buf_size < HEADER_SIZE) {
2718 *data_size = 0;
2719 return buf_size;
2720 }
2721
2722
2723 if (len > MPA_MAX_CODED_FRAME_SIZE)
2724 len = MPA_MAX_CODED_FRAME_SIZE;
2725
2726 memcpy(s->inbuf, buf, len);
2727 s->inbuf_ptr = s->inbuf + len;
2728
2729 // Get header and restore sync word
2730 header = (s->inbuf[0] << 24) | (s->inbuf[1] << 16) |
2731 (s->inbuf[2] << 8) | s->inbuf[3] | 0xffe00000;
2732
a7a85899 2733 if (ff_mpa_check_header(header) < 0) { // Bad header, discard frame
1ede228a
RT		 2734 *data_size = 0;
2735 return buf_size;
2736 }
2737
2738 decode_header(s, header);
2739 /* update codec info */
2740 avctx->sample_rate = s->sample_rate;
2741 avctx->channels = s->nb_channels;
2742 avctx->bit_rate = s->bit_rate;
2743 avctx->sub_id = s->layer;
2744
2745 avctx->frame_size=s->frame_size = len;
2746
2747 if (avctx->parse_only) {
2748 /* simply return the frame data */
2749 *(uint8_t **)data = s->inbuf;
2750 out_size = s->inbuf_ptr - s->inbuf;
2751 } else {
2752 out_size = mp_decode_frame(s, out_samples);
2753 }
2754
2755 *data_size = out_size;
2756 return buf_size;
2757}
2758
2759
d2a7718d
RT		 2760/* Next 3 arrays are indexed by channel config number (passed via codecdata) */
2761static int mp3Frames[16] = {0,1,1,2,3,3,4,5,2}; /* number of mp3 decoder instances */
2762static int mp3Channels[16] = {0,1,2,3,4,5,6,8,4}; /* total output channels */
2763/* offsets into output buffer, assume output order is FL FR BL BR C LFE */
2764static int chan_offset[9][5] = {
2765 {0},
2766 {0}, // C
2767 {0}, // FLR
2768 {2,0}, // C FLR
2769 {2,0,3}, // C FLR BS
2770 {4,0,2}, // C FLR BLRS
2771 {4,0,2,5}, // C FLR BLRS LFE
2772 {4,0,2,6,5}, // C FLR BLRS BLR LFE
2773 {0,2} // FLR BLRS
2774};
2775
2776
2777static int decode_init_mp3on4(AVCodecContext * avctx)
2778{
2779 MP3On4DecodeContext *s = avctx->priv_data;
2780 int i;
2781
2782 if ((avctx->extradata_size < 2) || (avctx->extradata == NULL)) {
2783 av_log(avctx, AV_LOG_ERROR, "Codec extradata missing or too short.\n");
2784 return -1;
2785 }
2786
2787 s->chan_cfg = (((unsigned char *)avctx->extradata)[1] >> 3) & 0x0f;
2788 s->frames = mp3Frames[s->chan_cfg];
2789 if(!s->frames) {
2790 av_log(avctx, AV_LOG_ERROR, "Invalid channel config number.\n");
2791 return -1;
2792 }
2793 avctx->channels = mp3Channels[s->chan_cfg];
2794
2795 /* Init the first mp3 decoder in standard way, so that all tables get builded
2796 * We replace avctx->priv_data with the context of the first decoder so that
2797 * decode_init() does not have to be changed.
2798 * Other decoders will be inited here copying data from the first context
2799 */
2800 // Allocate zeroed memory for the first decoder context
2801 s->mp3decctx[0] = av_mallocz(sizeof(MPADecodeContext));
2802 // Put decoder context in place to make init_decode() happy
2803 avctx->priv_data = s->mp3decctx[0];
2804 decode_init(avctx);
2805 // Restore mp3on4 context pointer
2806 avctx->priv_data = s;
2807 s->mp3decctx[0]->adu_mode = 1; // Set adu mode
2808
2809 /* Create a separate codec/context for each frame (first is already ok).
2810 * Each frame is 1 or 2 channels - up to 5 frames allowed
2811 */
2812 for (i = 1; i < s->frames; i++) {
2813 s->mp3decctx[i] = av_mallocz(sizeof(MPADecodeContext));
2814 s->mp3decctx[i]->compute_antialias = s->mp3decctx[0]->compute_antialias;
2815 s->mp3decctx[i]->inbuf = &s->mp3decctx[i]->inbuf1[0][BACKSTEP_SIZE];
2816 s->mp3decctx[i]->inbuf_ptr = s->mp3decctx[i]->inbuf;
2817 s->mp3decctx[i]->adu_mode = 1;
2818 }
2819
2820 return 0;
2821}
2822
2823
2824static int decode_close_mp3on4(AVCodecContext * avctx)
2825{
2826 MP3On4DecodeContext *s = avctx->priv_data;
2827 int i;
2828
2829 for (i = 0; i < s->frames; i++)
2830 if (s->mp3decctx[i])
2831 av_free(s->mp3decctx[i]);
2832
2833 return 0;
2834}
2835
2836
2837static int decode_frame_mp3on4(AVCodecContext * avctx,
bb270c08
DB		 2838 void *data, int *data_size,
2839 uint8_t * buf, int buf_size)
d2a7718d
RT		 2840{
2841 MP3On4DecodeContext *s = avctx->priv_data;
2842 MPADecodeContext *m;
2843 int len, out_size = 0;
2844 uint32_t header;
2845 OUT_INT *out_samples = data;
2846 OUT_INT decoded_buf[MPA_FRAME_SIZE * MPA_MAX_CHANNELS];
2847 OUT_INT *outptr, *bp;
2848 int fsize;
2849 unsigned char *start2 = buf, *start;
2850 int fr, i, j, n;
2851 int off = avctx->channels;
2852 int *coff = chan_offset[s->chan_cfg];
2853
2854 len = buf_size;
2855
2856 // Discard too short frames
2857 if (buf_size < HEADER_SIZE) {
2858 *data_size = 0;
2859 return buf_size;
2860 }
2861
2862 // If only one decoder interleave is not needed
2863 outptr = s->frames == 1 ? out_samples : decoded_buf;
2864
2865 for (fr = 0; fr < s->frames; fr++) {
2866 start = start2;
2867 fsize = (start[0] << 4) | (start[1] >> 4);
2868 start2 += fsize;
2869 if (fsize > len)
2870 fsize = len;
2871 len -= fsize;
2872 if (fsize > MPA_MAX_CODED_FRAME_SIZE)
2873 fsize = MPA_MAX_CODED_FRAME_SIZE;
2874 m = s->mp3decctx[fr];
2875 assert (m != NULL);
2876 /* copy original to new */
2877 m->inbuf_ptr = m->inbuf + fsize;
2878 memcpy(m->inbuf, start, fsize);
2879
2880 // Get header
2881 header = (m->inbuf[0] << 24) | (m->inbuf[1] << 16) |
2882 (m->inbuf[2] << 8) | m->inbuf[3] | 0xfff00000;
2883
2884 if (ff_mpa_check_header(header) < 0) { // Bad header, discard block
2885 *data_size = 0;
2886 return buf_size;
2887 }
2888
2889 decode_header(m, header);
2890 mp_decode_frame(m, decoded_buf);
2891
2892 n = MPA_FRAME_SIZE * m->nb_channels;
2893 out_size += n * sizeof(OUT_INT);
2894 if(s->frames > 1) {
2895 /* interleave output data */
2896 bp = out_samples + coff[fr];
2897 if(m->nb_channels == 1) {
2898 for(j = 0; j < n; j++) {
2899 *bp = decoded_buf[j];
2900 bp += off;
2901 }
2902 } else {
2903 for(j = 0; j < n; j++) {
2904 bp[0] = decoded_buf[j++];
2905 bp[1] = decoded_buf[j];
2906 bp += off;
2907 }
2908 }
2909 }
2910 }
2911
2912 /* update codec info */
2913 avctx->sample_rate = s->mp3decctx[0]->sample_rate;
2914 avctx->frame_size= buf_size;
2915 avctx->bit_rate = 0;
2916 for (i = 0; i < s->frames; i++)
2917 avctx->bit_rate += s->mp3decctx[i]->bit_rate;
2918
2919 *data_size = out_size;
2920 return buf_size;
2921}
2922
2923
4b1f4f23 2924AVCodec mp2_decoder =
de6d9b64 2925{
4b1f4f23 2926 "mp2",
de6d9b64
FB		 2927 CODEC_TYPE_AUDIO,
2928 CODEC_ID_MP2,
2929 sizeof(MPADecodeContext),
2930 decode_init,
2931 NULL,
2932 NULL,
2933 decode_frame,
8c5b5683 2934 CODEC_CAP_PARSE_ONLY,
de6d9b64 2935};
4b1f4f23
J		 2936
2937AVCodec mp3_decoder =
2938{
2939 "mp3",
2940 CODEC_TYPE_AUDIO,
80783dc2 2941 CODEC_ID_MP3,
4b1f4f23
J		 2942 sizeof(MPADecodeContext),
2943 decode_init,
2944 NULL,
2945 NULL,
2946 decode_frame,
8c5b5683 2947 CODEC_CAP_PARSE_ONLY,
4b1f4f23 2948};
1ede228a
RT		 2949
2950AVCodec mp3adu_decoder =
2951{
2952 "mp3adu",
2953 CODEC_TYPE_AUDIO,
2954 CODEC_ID_MP3ADU,
2955 sizeof(MPADecodeContext),
2956 decode_init,
2957 NULL,
2958 NULL,
2959 decode_frame_adu,
2960 CODEC_CAP_PARSE_ONLY,
2961};
d2a7718d
RT		 2962
2963AVCodec mp3on4_decoder =
2964{
2965 "mp3on4",
2966 CODEC_TYPE_AUDIO,
2967 CODEC_ID_MP3ON4,
2968 sizeof(MP3On4DecodeContext),
2969 decode_init_mp3on4,
2970 NULL,
2971 decode_close_mp3on4,
2972 decode_frame_mp3on4,
2973 0
2974};
Libav master