1 /*
2 * Mpeg Layer-3 audio decoder
3 * --------------------------
4 * copyright (c) 1995,1996,1997 by Michael Hipp.
5 * All rights reserved. See also 'README'
6 */
7
8 /* $Id: layer3.c,v 1.3 2003/08/12 00:02:55 snelg Exp $ */
9
10 #ifdef HAVE_CONFIG_H
11 # include <config.h>
12 #endif
13
14 #include <stdlib.h>
15 #include "common.h"
16 #include "huffman.h"
17 #include "encoder.h"
18 #include "decode_i386.h"
19
20 #ifdef WITH_DMALLOC
21 #include <dmalloc.h>
22 #endif
23
24 #define MPEG1
25
26
27 unsigned char *maxGain;
28 unsigned char *minGain;
29
30 static real ispow[8207];
31 static real aa_ca[8],aa_cs[8];
32 static real COS1[12][6];
33 static real win[4][36];
34 static real win1[4][36];
35 static real gainpow2[256+118+4];
36 static real COS9[9];
37 static real COS6_1,COS6_2;
38 static real tfcos36[9];
39 static real tfcos12[3];
40
41 struct bandInfoStruct {
42 short longIdx[23];
43 short longDiff[22];
44 short shortIdx[14];
45 short shortDiff[13];
46 };
47
48 int longLimit[9][23];
49 int shortLimit[9][14];
50
51 const struct bandInfoStruct bandInfo[9] = {
52
53 /* MPEG 1.0 */
54 { {0,4,8,12,16,20,24,30,36,44,52,62,74, 90,110,134,162,196,238,288,342,418,576},
55 {4,4,4,4,4,4,6,6,8, 8,10,12,16,20,24,28,34,42,50,54, 76,158},
56 {0,4*3,8*3,12*3,16*3,22*3,30*3,40*3,52*3,66*3, 84*3,106*3,136*3,192*3},
57 {4,4,4,4,6,8,10,12,14,18,22,30,56} } ,
58
59 { {0,4,8,12,16,20,24,30,36,42,50,60,72, 88,106,128,156,190,230,276,330,384,576},
60 {4,4,4,4,4,4,6,6,6, 8,10,12,16,18,22,28,34,40,46,54, 54,192},
61 {0,4*3,8*3,12*3,16*3,22*3,28*3,38*3,50*3,64*3, 80*3,100*3,126*3,192*3},
62 {4,4,4,4,6,6,10,12,14,16,20,26,66} } ,
63
64 { {0,4,8,12,16,20,24,30,36,44,54,66,82,102,126,156,194,240,296,364,448,550,576} ,
65 {4,4,4,4,4,4,6,6,8,10,12,16,20,24,30,38,46,56,68,84,102, 26} ,
66 {0,4*3,8*3,12*3,16*3,22*3,30*3,42*3,58*3,78*3,104*3,138*3,180*3,192*3} ,
67 {4,4,4,4,6,8,12,16,20,26,34,42,12} } ,
68
69 /* MPEG 2.0 */
70 { {0,6,12,18,24,30,36,44,54,66,80,96,116,140,168,200,238,284,336,396,464,522,576},
71 {6,6,6,6,6,6,8,10,12,14,16,20,24,28,32,38,46,52,60,68,58,54 } ,
72 {0,4*3,8*3,12*3,18*3,24*3,32*3,42*3,56*3,74*3,100*3,132*3,174*3,192*3} ,
73 {4,4,4,6,6,8,10,14,18,26,32,42,18 } } ,
74 /* docs: 332. mpg123: 330 */
75 { {0,6,12,18,24,30,36,44,54,66,80,96,114,136,162,194,232,278,332,394,464,540,576},
76 {6,6,6,6,6,6,8,10,12,14,16,18,22,26,32,38,46,54,62,70,76,36 } ,
77 {0,4*3,8*3,12*3,18*3,26*3,36*3,48*3,62*3,80*3,104*3,136*3,180*3,192*3} ,
78 {4,4,4,6,8,10,12,14,18,24,32,44,12 } } ,
79
80 { {0,6,12,18,24,30,36,44,54,66,80,96,116,140,168,200,238,284,336,396,464,522,576},
81 {6,6,6,6,6,6,8,10,12,14,16,20,24,28,32,38,46,52,60,68,58,54 },
82 {0,4*3,8*3,12*3,18*3,26*3,36*3,48*3,62*3,80*3,104*3,134*3,174*3,192*3},
83 {4,4,4,6,8,10,12,14,18,24,30,40,18 } } ,
84 /* MPEG 2.5 */
85 { {0,6,12,18,24,30,36,44,54,66,80,96,116,140,168,200,238,284,336,396,464,522,576} ,
86 {6,6,6,6,6,6,8,10,12,14,16,20,24,28,32,38,46,52,60,68,58,54},
87 {0,12,24,36,54,78,108,144,186,240,312,402,522,576},
88 {4,4,4,6,8,10,12,14,18,24,30,40,18} },
89 { {0,6,12,18,24,30,36,44,54,66,80,96,116,140,168,200,238,284,336,396,464,522,576} ,
90 {6,6,6,6,6,6,8,10,12,14,16,20,24,28,32,38,46,52,60,68,58,54},
91 {0,12,24,36,54,78,108,144,186,240,312,402,522,576},
92 {4,4,4,6,8,10,12,14,18,24,30,40,18} },
93 { {0,12,24,36,48,60,72,88,108,132,160,192,232,280,336,400,476,566,568,570,572,574,576},
94 {12,12,12,12,12,12,16,20,24,28,32,40,48,56,64,76,90,2,2,2,2,2},
95 {0, 24, 48, 72,108,156,216,288,372,480,486,492,498,576},
96 {8,8,8,12,16,20,24,28,36,2,2,2,26} } ,
97 };
98
99 static int mapbuf0[9][152];
100 static int mapbuf1[9][156];
101 static int mapbuf2[9][44];
102 static int *map[9][3];
103 static int *mapend[9][3];
104
105 static unsigned int n_slen2[512]; /* MPEG 2.0 slen for 'normal' mode */
106 static unsigned int i_slen2[256]; /* MPEG 2.0 slen for intensity stereo */
107
108 static real tan1_1[16],tan2_1[16],tan1_2[16],tan2_2[16];
109 static real pow1_1[2][16],pow2_1[2][16],pow1_2[2][16],pow2_2[2][16];
110
get1bit(void)111 static unsigned int get1bit(void)
112 {
113 unsigned char rval;
114 rval = *wordpointer << bitindex;
115
116 bitindex++;
117 wordpointer += (bitindex>>3);
118 bitindex &= 7;
119
120 return rval>>7;
121 }
122
123
124
125
126 /*
127 * init tables for layer-3
128 */
init_layer3(int down_sample_sblimit)129 void init_layer3(int down_sample_sblimit)
130 {
131 int i,j,k;
132
133 for(i=-256;i<118+4;i++)
134 gainpow2[i+256] = pow((double)2.0,-0.25 * (double) (i+210) );
135
136 for(i=0;i<8207;i++)
137 ispow[i] = pow((double)i,(double)4.0/3.0);
138
139 for (i=0;i<8;i++)
140 {
141 static double Ci[8]={-0.6,-0.535,-0.33,-0.185,-0.095,-0.041,-0.0142,-0.0037};
142 double sq=sqrt(1.0+Ci[i]*Ci[i]);
143 aa_cs[i] = 1.0/sq;
144 aa_ca[i] = Ci[i]/sq;
145 }
146
147 for(i=0;i<18;i++)
148 {
149 win[0][i] = win[1][i] = 0.5 * sin( M_PI / 72.0 * (double) (2*(i+0) +1) ) / cos ( M_PI * (double) (2*(i+0) +19) / 72.0 );
150 win[0][i+18] = win[3][i+18] = 0.5 * sin( M_PI / 72.0 * (double) (2*(i+18)+1) ) / cos ( M_PI * (double) (2*(i+18)+19) / 72.0 );
151 }
152 for(i=0;i<6;i++)
153 {
154 win[1][i+18] = 0.5 / cos ( M_PI * (double) (2*(i+18)+19) / 72.0 );
155 win[3][i+12] = 0.5 / cos ( M_PI * (double) (2*(i+12)+19) / 72.0 );
156 win[1][i+24] = 0.5 * sin( M_PI / 24.0 * (double) (2*i+13) ) / cos ( M_PI * (double) (2*(i+24)+19) / 72.0 );
157 win[1][i+30] = win[3][i] = 0.0;
158 win[3][i+6 ] = 0.5 * sin( M_PI / 24.0 * (double) (2*i+1) ) / cos ( M_PI * (double) (2*(i+6 )+19) / 72.0 );
159 }
160
161 for(i=0;i<9;i++)
162 COS9[i] = cos( M_PI / 18.0 * (double) i);
163
164 for(i=0;i<9;i++)
165 tfcos36[i] = 0.5 / cos ( M_PI * (double) (i*2+1) / 36.0 );
166 for(i=0;i<3;i++)
167 tfcos12[i] = 0.5 / cos ( M_PI * (double) (i*2+1) / 12.0 );
168
169 COS6_1 = cos( M_PI / 6.0 * (double) 1);
170 COS6_2 = cos( M_PI / 6.0 * (double) 2);
171
172 for(i=0;i<12;i++)
173 {
174 win[2][i] = 0.5 * sin( M_PI / 24.0 * (double) (2*i+1) ) / cos ( M_PI * (double) (2*i+7) / 24.0 );
175 for(j=0;j<6;j++)
176 COS1[i][j] = cos( M_PI / 24.0 * (double) ((2*i+7)*(2*j+1)) );
177 }
178
179 for(j=0;j<4;j++) {
180 static int len[4] = { 36,36,12,36 };
181 for(i=0;i<len[j];i+=2)
182 win1[j][i] = + win[j][i];
183 for(i=1;i<len[j];i+=2)
184 win1[j][i] = - win[j][i];
185 }
186
187 for(i=0;i<16;i++)
188 {
189 double t = tan( (double) i * M_PI / 12.0 );
190 tan1_1[i] = t / (1.0+t);
191 tan2_1[i] = 1.0 / (1.0 + t);
192 tan1_2[i] = M_SQRT2 * t / (1.0+t);
193 tan2_2[i] = M_SQRT2 / (1.0 + t);
194
195 for(j=0;j<2;j++) {
196 double base = pow(2.0,-0.25*(j+1.0));
197 double p1=1.0,p2=1.0;
198 if(i > 0) {
199 if( i & 1 )
200 p1 = pow(base,(i+1.0)*0.5);
201 else
202 p2 = pow(base,i*0.5);
203 }
204 pow1_1[j][i] = p1;
205 pow2_1[j][i] = p2;
206 pow1_2[j][i] = M_SQRT2 * p1;
207 pow2_2[j][i] = M_SQRT2 * p2;
208 }
209 }
210
211 for(j=0;j<9;j++)
212 {
213 struct bandInfoStruct *bi = (struct bandInfoStruct *)&bandInfo[j];
214 int *mp;
215 int cb,lwin;
216 short *bdf;
217
218 mp = map[j][0] = mapbuf0[j];
219 bdf = bi->longDiff;
220 for(i=0,cb = 0; cb < 8 ; cb++,i+=*bdf++) {
221 *mp++ = (*bdf) >> 1;
222 *mp++ = i;
223 *mp++ = 3;
224 *mp++ = cb;
225 }
226 bdf = bi->shortDiff+3;
227 for(cb=3;cb<13;cb++) {
228 int l = (*bdf++) >> 1;
229 for(lwin=0;lwin<3;lwin++) {
230 *mp++ = l;
231 *mp++ = i + lwin;
232 *mp++ = lwin;
233 *mp++ = cb;
234 }
235 i += 6*l;
236 }
237 mapend[j][0] = mp;
238
239 mp = map[j][1] = mapbuf1[j];
240 bdf = bi->shortDiff+0;
241 for(i=0,cb=0;cb<13;cb++) {
242 int l = (*bdf++) >> 1;
243 for(lwin=0;lwin<3;lwin++) {
244 *mp++ = l;
245 *mp++ = i + lwin;
246 *mp++ = lwin;
247 *mp++ = cb;
248 }
249 i += 6*l;
250 }
251 mapend[j][1] = mp;
252
253 mp = map[j][2] = mapbuf2[j];
254 bdf = bi->longDiff;
255 for(cb = 0; cb < 22 ; cb++) {
256 *mp++ = (*bdf++) >> 1;
257 *mp++ = cb;
258 }
259 mapend[j][2] = mp;
260
261 }
262
263 for(j=0;j<9;j++) {
264 for(i=0;i<23;i++) {
265 longLimit[j][i] = (bandInfo[j].longIdx[i] - 1 + 8) / 18 + 1;
266 if(longLimit[j][i] > (down_sample_sblimit) )
267 longLimit[j][i] = down_sample_sblimit;
268 }
269 for(i=0;i<14;i++) {
270 shortLimit[j][i] = (bandInfo[j].shortIdx[i] - 1) / 18 + 1;
271 if(shortLimit[j][i] > (down_sample_sblimit) )
272 shortLimit[j][i] = down_sample_sblimit;
273 }
274 }
275
276 for(i=0;i<5;i++) {
277 for(j=0;j<6;j++) {
278 for(k=0;k<6;k++) {
279 int n = k + j * 6 + i * 36;
280 i_slen2[n] = i|(j<<3)|(k<<6)|(3<<12);
281 }
282 }
283 }
284 for(i=0;i<4;i++) {
285 for(j=0;j<4;j++) {
286 for(k=0;k<4;k++) {
287 int n = k + j * 4 + i * 16;
288 i_slen2[n+180] = i|(j<<3)|(k<<6)|(4<<12);
289 }
290 }
291 }
292 for(i=0;i<4;i++) {
293 for(j=0;j<3;j++) {
294 int n = j + i * 3;
295 i_slen2[n+244] = i|(j<<3) | (5<<12);
296 n_slen2[n+500] = i|(j<<3) | (2<<12) | (1<<15);
297 }
298 }
299
300 for(i=0;i<5;i++) {
301 for(j=0;j<5;j++) {
302 for(k=0;k<4;k++) {
303 int l;
304 for(l=0;l<4;l++) {
305 int n = l + k * 4 + j * 16 + i * 80;
306 n_slen2[n] = i|(j<<3)|(k<<6)|(l<<9)|(0<<12);
307 }
308 }
309 }
310 }
311 for(i=0;i<5;i++) {
312 for(j=0;j<5;j++) {
313 for(k=0;k<4;k++) {
314 int n = k + j * 4 + i * 20;
315 n_slen2[n+400] = i|(j<<3)|(k<<6)|(1<<12);
316 }
317 }
318 }
319 }
320
321 /*
322 * read additional side information
323 */
324 #ifdef MPEG1
III_get_side_info_1(struct III_sideinfo * si,int stereo,int ms_stereo,long sfreq,int single)325 static int III_get_side_info_1(struct III_sideinfo *si,int stereo,
326 int ms_stereo,long sfreq,int single)
327 {
328 int ch, gr;
329 int powdiff = (single == 3) ? 4 : 0;
330
331 si->main_data_begin = getbits(9);
332 if (stereo == 1)
333 si->private_bits = getbits_fast(5);
334 else
335 si->private_bits = getbits_fast(3);
336
337 for (ch=0; ch<stereo; ch++) {
338 si->ch[ch].gr[0].scfsi = -1;
339 si->ch[ch].gr[1].scfsi = getbits_fast(4);
340 }
341
342 for (gr=0; gr<2; gr++)
343 {
344 for (ch=0; ch<stereo; ch++)
345 {
346 register struct gr_info_s *gr_infos = &(si->ch[ch].gr[gr]);
347
348 gr_infos->part2_3_length = getbits(12);
349 gr_infos->big_values = getbits_fast(9);
350 if(gr_infos->big_values > 288) {
351 // fprintf(stderr,"big_values too large! %i\n",gr_infos->big_values);
352 //gr_infos->big_values = 288;
353 return 0;
354 }
355 {
356 unsigned int qss = getbits_fast(8);
357 if ((unsigned char)qss > *maxGain) *maxGain = (unsigned char)qss;
358 if ((unsigned char)qss < *minGain) *minGain = (unsigned char)qss;
359
360 gr_infos->pow2gain = gainpow2+256 - qss + powdiff;
361 }
362 if(ms_stereo)
363 gr_infos->pow2gain += 2;
364 gr_infos->scalefac_compress = getbits_fast(4);
365 /* window-switching flag == 1 for block_Type != 0 .. and block-type == 0 -> win-sw-flag = 0 */
366 if(get1bit())
367 {
368 int i;
369 gr_infos->block_type = getbits_fast(2);
370 gr_infos->mixed_block_flag = get1bit();
371 gr_infos->table_select[0] = getbits_fast(5);
372 gr_infos->table_select[1] = getbits_fast(5);
373
374
375 /*
376 * table_select[2] not needed, because there is no region2,
377 * but to satisfy some verifications tools we set it either.
378 */
379 gr_infos->table_select[2] = 0;
380 for(i=0;i<3;i++) {
381 unsigned int sbg = (getbits_fast(3)<<3);
382 gr_infos->full_gain[i] = gr_infos->pow2gain + sbg;
383 }
384
385 if(gr_infos->block_type == 0) {
386 // fprintf(stderr,"Blocktype == 0 and window-switching == 1 not allowed.\n");
387 return 0;
388 /* error seems to be very good recoverable, so don't exit */
389 /* exit(1); */
390 }
391 /* region_count/start parameters are implicit in this case. */
392 gr_infos->region1start = 36>>1;
393 gr_infos->region2start = 576>>1;
394 }
395 else
396 {
397 int i,r0c,r1c;
398 for (i=0; i<3; i++)
399 gr_infos->table_select[i] = getbits_fast(5);
400 r0c = getbits_fast(4);
401 r1c = getbits_fast(3);
402 gr_infos->region1start = bandInfo[sfreq].longIdx[r0c+1] >> 1 ;
403 gr_infos->region2start = bandInfo[sfreq].longIdx[r0c+1+r1c+1] >> 1;
404 gr_infos->block_type = 0;
405 gr_infos->mixed_block_flag = 0;
406 }
407 gr_infos->preflag = get1bit();
408 gr_infos->scalefac_scale = get1bit();
409 gr_infos->count1table_select = get1bit();
410 }
411 }
412 return 1;
413 }
414 #endif
415
416 /*
417 * Side Info for MPEG 2.0 / LSF
418 */
III_get_side_info_2(struct III_sideinfo * si,int stereo,int ms_stereo,long sfreq,int single)419 static int III_get_side_info_2(struct III_sideinfo *si,int stereo,
420 int ms_stereo,long sfreq,int single)
421 {
422 int ch;
423 int powdiff = (single == 3) ? 4 : 0;
424
425 si->main_data_begin = getbits(8);
426
427 if (stereo == 1)
428 si->private_bits = get1bit();
429 else
430 si->private_bits = getbits_fast(2);
431
432 for (ch=0; ch<stereo; ch++)
433 {
434 register struct gr_info_s *gr_infos = &(si->ch[ch].gr[0]);
435 unsigned int qss;
436
437 gr_infos->part2_3_length = getbits(12);
438 gr_infos->big_values = getbits_fast(9);
439 if(gr_infos->big_values > 288) {
440 // fprintf(stderr,"big_values too large! %i\n",gr_infos->big_values);
441 //gr_infos->big_values = 288;
442 return 0;
443 }
444 qss=getbits_fast(8);
445 if ((unsigned char)qss > *maxGain) *maxGain = (unsigned char)qss;
446 if ((unsigned char)qss < *minGain) *minGain = (unsigned char)qss;
447
448 gr_infos->pow2gain = gainpow2+256 - qss + powdiff;
449
450
451 if(ms_stereo)
452 gr_infos->pow2gain += 2;
453 gr_infos->scalefac_compress = getbits(9);
454 /* window-switching flag == 1 for block_Type != 0 .. and block-type == 0 -> win-sw-flag = 0 */
455 if(get1bit())
456 {
457 int i;
458 gr_infos->block_type = getbits_fast(2);
459 gr_infos->mixed_block_flag = get1bit();
460 gr_infos->table_select[0] = getbits_fast(5);
461 gr_infos->table_select[1] = getbits_fast(5);
462 /*
463 * table_select[2] not needed, because there is no region2,
464 * but to satisfy some verifications tools we set it either.
465 */
466 gr_infos->table_select[2] = 0;
467 for(i=0;i<3;i++) {
468 unsigned int sbg = (getbits_fast(3)<<3);
469 gr_infos->full_gain[i] = gr_infos->pow2gain + sbg;
470
471 }
472
473 if(gr_infos->block_type == 0) {
474 // fprintf(stderr,"Blocktype == 0 and window-switching == 1 not allowed.\n");
475 return 0;
476 /* error seems to be very good recoverable, so don't exit */
477 /* exit(1); */
478 }
479 /* region_count/start parameters are implicit in this case. */
480 /* check this again! */
481 if(gr_infos->block_type == 2)
482 gr_infos->region1start = 36>>1;
483 else if(sfreq == 8)
484 /* check this for 2.5 and sfreq=8 */
485 gr_infos->region1start = 108>>1;
486 else
487 gr_infos->region1start = 54>>1;
488 gr_infos->region2start = 576>>1;
489 }
490 else
491 {
492 int i,r0c,r1c;
493 for (i=0; i<3; i++)
494 gr_infos->table_select[i] = getbits_fast(5);
495 r0c = getbits_fast(4);
496 r1c = getbits_fast(3);
497 gr_infos->region1start = bandInfo[sfreq].longIdx[r0c+1] >> 1 ;
498 gr_infos->region2start = bandInfo[sfreq].longIdx[r0c+1+r1c+1] >> 1;
499 gr_infos->block_type = 0;
500 gr_infos->mixed_block_flag = 0;
501 }
502 gr_infos->scalefac_scale = get1bit();
503 gr_infos->count1table_select = get1bit();
504 }
505 return 1;
506 }
507
508 /*
509 * read scalefactors
510 */
511 #ifdef MPEG1
III_get_scale_factors_1(int * scf,struct gr_info_s * gr_infos)512 static int III_get_scale_factors_1(int *scf,struct gr_info_s *gr_infos)
513 {
514 static const unsigned char slen[2][16] = {
515 {0, 0, 0, 0, 3, 1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4},
516 {0, 1, 2, 3, 0, 1, 2, 3, 1, 2, 3, 1, 2, 3, 2, 3}
517 };
518 int numbits;
519 int num0 = slen[0][gr_infos->scalefac_compress];
520 int num1 = slen[1][gr_infos->scalefac_compress];
521
522 if (gr_infos->block_type == 2)
523 {
524 int i=18;
525 numbits = (num0 + num1) * 18;
526
527 if (gr_infos->mixed_block_flag) {
528 for (i=8;i;i--)
529 *scf++ = getbits_fast(num0);
530 i = 9;
531 numbits -= num0; /* num0 * 17 + num1 * 18 */
532 }
533
534 for (;i;i--)
535 *scf++ = getbits_fast(num0);
536 for (i = 18; i; i--)
537 *scf++ = getbits_fast(num1);
538 *scf++ = 0; *scf++ = 0; *scf++ = 0; /* short[13][0..2] = 0 */
539 }
540 else
541 {
542 int i;
543 int scfsi = gr_infos->scfsi;
544
545 if(scfsi < 0) { /* scfsi < 0 => granule == 0 */
546 for(i=11;i;i--)
547 *scf++ = getbits_fast(num0);
548 for(i=10;i;i--)
549 *scf++ = getbits_fast(num1);
550 numbits = (num0 + num1) * 10 + num0;
551 }
552 else {
553 numbits = 0;
554 if(!(scfsi & 0x8)) {
555 for (i=6;i;i--)
556 *scf++ = getbits_fast(num0);
557 numbits += num0 * 6;
558 }
559 else {
560 scf += 6;
561 }
562
563 if(!(scfsi & 0x4)) {
564 for (i=5;i;i--)
565 *scf++ = getbits_fast(num0);
566 numbits += num0 * 5;
567 }
568 else {
569 scf += 5;
570 }
571
572 if(!(scfsi & 0x2)) {
573 for(i=5;i;i--)
574 *scf++ = getbits_fast(num1);
575 numbits += num1 * 5;
576 }
577 else {
578 scf += 5;
579 }
580
581 if(!(scfsi & 0x1)) {
582 for (i=5;i;i--)
583 *scf++ = getbits_fast(num1);
584 numbits += num1 * 5;
585 }
586 else {
587 scf += 5;
588 }
589 }
590
591 *scf++ = 0; /* no l[21] in original sources */
592 }
593 return numbits;
594 }
595 #endif
596
III_get_scale_factors_2(int * scf,struct gr_info_s * gr_infos,int i_stereo)597 static int III_get_scale_factors_2(int *scf,struct gr_info_s *gr_infos,int i_stereo)
598 {
599 unsigned char *pnt;
600 int i,j;
601 unsigned int slen;
602 int n = 0;
603 int numbits = 0;
604
605 static const unsigned char stab[3][6][4] = {
606 { { 6, 5, 5,5 } , { 6, 5, 7,3 } , { 11,10,0,0} ,
607 { 7, 7, 7,0 } , { 6, 6, 6,3 } , { 8, 8,5,0} } ,
608 { { 9, 9, 9,9 } , { 9, 9,12,6 } , { 18,18,0,0} ,
609 {12,12,12,0 } , {12, 9, 9,6 } , { 15,12,9,0} } ,
610 { { 6, 9, 9,9 } , { 6, 9,12,6 } , { 15,18,0,0} ,
611 { 6,15,12,0 } , { 6,12, 9,6 } , { 6,18,9,0} } };
612
613 if(i_stereo) /* i_stereo AND second channel -> do_layer3() checks this */
614 slen = i_slen2[gr_infos->scalefac_compress>>1];
615 else
616 slen = n_slen2[gr_infos->scalefac_compress];
617
618 gr_infos->preflag = (slen>>15) & 0x1;
619
620 n = 0;
621 if( gr_infos->block_type == 2 ) {
622 n++;
623 if(gr_infos->mixed_block_flag)
624 n++;
625 }
626
627 pnt = (unsigned char *)stab[n][(slen>>12)&0x7];
628
629 for(i=0;i<4;i++) {
630 int num = slen & 0x7;
631 slen >>= 3;
632 if(num) {
633 for(j=0;j<(int)(pnt[i]);j++)
634 *scf++ = getbits_fast(num);
635 numbits += pnt[i] * num;
636 }
637 else {
638 for(j=0;j<(int)(pnt[i]);j++)
639 *scf++ = 0;
640 }
641 }
642
643 n = (n << 1) + 1;
644 for(i=0;i<n;i++)
645 *scf++ = 0;
646
647 return numbits;
648 }
649
650 static const int pretab1 [22] = {0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,2,2,3,3,3,2,0}; /* char enough ? */
651 static const int pretab2 [22] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
652
653 /*
654 * don't forget to apply the same changes to III_dequantize_sample_ms() !!!
655 */
III_dequantize_sample(real xr[SBLIMIT][SSLIMIT],int * scf,struct gr_info_s * gr_infos,int sfreq,int part2bits)656 static int III_dequantize_sample(real xr[SBLIMIT][SSLIMIT],int *scf,
657 struct gr_info_s *gr_infos,int sfreq,int part2bits)
658 {
659 int shift = 1 + gr_infos->scalefac_scale;
660 real *xrpnt = (real *) xr;
661 int l[3],l3;
662 int part2remain = gr_infos->part2_3_length - part2bits;
663 int *me;
664
665 {
666 int i;
667
668 for(i=(&xr[SBLIMIT][0]-xrpnt)>>1;i>0;i--) {
669 *xrpnt++ = 0.0;
670 *xrpnt++ = 0.0;
671 }
672
673 xrpnt = (real *) xr;
674 }
675
676 {
677 int bv = gr_infos->big_values;
678 int region1 = gr_infos->region1start;
679 int region2 = gr_infos->region2start;
680
681 l3 = ((576>>1)-bv)>>1;
682 /*
683 * we may lose the 'odd' bit here !!
684 * check this later again
685 */
686 if(bv <= region1) {
687 l[0] = bv; l[1] = 0; l[2] = 0;
688 }
689 else {
690 l[0] = region1;
691 if(bv <= region2) {
692 l[1] = bv - l[0]; l[2] = 0;
693 }
694 else {
695 l[1] = region2 - l[0]; l[2] = bv - region2;
696 }
697 }
698 }
699
700 if(gr_infos->block_type == 2) {
701 /*
702 * decoding with short or mixed mode BandIndex table
703 */
704 int i,max[4];
705 int step=0,lwin=0,cb=0;
706 register real v = 0.0;
707 register int *m,mc;
708
709 if(gr_infos->mixed_block_flag) {
710 max[3] = -1;
711 max[0] = max[1] = max[2] = 2;
712 m = map[sfreq][0];
713 me = mapend[sfreq][0];
714 }
715 else {
716 max[0] = max[1] = max[2] = max[3] = -1;
717 /* max[3] not really needed in this case */
718 m = map[sfreq][1];
719 me = mapend[sfreq][1];
720 }
721
722 mc = 0;
723 for(i=0;i<2;i++) {
724 int lp = l[i];
725 struct newhuff *h = (struct newhuff *)(ht+gr_infos->table_select[i]);
726 for(;lp;lp--,mc--) {
727 register int x,y;
728 if( (!mc) ) {
729 mc = *m++;
730 xrpnt = ((real *) xr) + (*m++);
731 lwin = *m++;
732 cb = *m++;
733 if(lwin == 3) {
734 v = gr_infos->pow2gain[(*scf++) << shift];
735 step = 1;
736 }
737 else {
738 v = gr_infos->full_gain[lwin][(*scf++) << shift];
739 step = 3;
740 }
741 }
742 {
743 register short *val = (short *)h->table;
744 while((y=*val++)<0) {
745 if (get1bit())
746 val -= y;
747 part2remain--;
748 }
749 x = y >> 4;
750 y &= 0xf;
751 }
752 if(x == 15) {
753 max[lwin] = cb;
754 part2remain -= h->linbits+1;
755 x += getbits((int)h->linbits);
756 if(get1bit())
757 *xrpnt = -ispow[x] * v;
758 else
759 *xrpnt = ispow[x] * v;
760 }
761 else if(x) {
762 max[lwin] = cb;
763 if(get1bit())
764 *xrpnt = -ispow[x] * v;
765 else
766 *xrpnt = ispow[x] * v;
767 part2remain--;
768 }
769 else
770 *xrpnt = 0.0;
771 xrpnt += step;
772 if(y == 15) {
773 max[lwin] = cb;
774 part2remain -= h->linbits+1;
775 y += getbits((int)h->linbits);
776 if(get1bit())
777 *xrpnt = -ispow[y] * v;
778 else
779 *xrpnt = ispow[y] * v;
780 }
781 else if(y) {
782 max[lwin] = cb;
783 if(get1bit())
784 *xrpnt = -ispow[y] * v;
785 else
786 *xrpnt = ispow[y] * v;
787 part2remain--;
788 }
789 else
790 *xrpnt = 0.0;
791 xrpnt += step;
792 }
793 }
794 for(;l3 && (part2remain > 0);l3--) {
795 struct newhuff *h = (struct newhuff *)(htc+gr_infos->count1table_select);
796 register short *val = (short *)h->table,a;
797
798 while((a=*val++)<0) {
799 part2remain--;
800 if(part2remain < 0) {
801 part2remain++;
802 a = 0;
803 break;
804 }
805 if (get1bit())
806 val -= a;
807 }
808 for(i=0;i<4;i++) {
809 if(!(i & 1)) {
810 if(!mc) {
811 mc = *m++;
812 xrpnt = ((real *) xr) + (*m++);
813 lwin = *m++;
814 cb = *m++;
815 if(lwin == 3) {
816 v = gr_infos->pow2gain[(*scf++) << shift];
817 step = 1;
818 }
819 else {
820 v = gr_infos->full_gain[lwin][(*scf++) << shift];
821 step = 3;
822 }
823 }
824 mc--;
825 }
826 if( (a & (0x8>>i)) ) {
827 max[lwin] = cb;
828 part2remain--;
829 if(part2remain < 0) {
830 part2remain++;
831 break;
832 }
833 if(get1bit())
834 *xrpnt = -v;
835 else
836 *xrpnt = v;
837 }
838 else
839 *xrpnt = 0.0;
840 xrpnt += step;
841 }
842 }
843
844 while( m < me ) {
845 if(!mc) {
846 mc = *m++;
847 xrpnt = ((real *) xr) + *m++;
848 if( (*m++) == 3)
849 step = 1;
850 else
851 step = 3;
852 m++; /* cb */
853 }
854 mc--;
855 *xrpnt = 0.0;
856 xrpnt += step;
857 *xrpnt = 0.0;
858 xrpnt += step;
859 /* we could add a little opt. here:
860 * if we finished a band for window 3 or a long band
861 * further bands could copied in a simple loop without a
862 * special 'map' decoding
863 */
864 }
865
866 gr_infos->maxband[0] = max[0]+1;
867 gr_infos->maxband[1] = max[1]+1;
868 gr_infos->maxband[2] = max[2]+1;
869 gr_infos->maxbandl = max[3]+1;
870
871 {
872 int rmax = max[0] > max[1] ? max[0] : max[1];
873 rmax = (rmax > max[2] ? rmax : max[2]) + 1;
874 gr_infos->maxb = rmax ? shortLimit[sfreq][rmax] : longLimit[sfreq][max[3]+1];
875 }
876
877 }
878 else {
879 /*
880 * decoding with 'long' BandIndex table (block_type != 2)
881 */
882 int *pretab = (int *)(gr_infos->preflag ? pretab1 : pretab2);
883 int i,max = -1;
884 int cb = 0;
885 register int *m = map[sfreq][2];
886 register real v = 0.0;
887 register int mc = 0;
888 #if 0
889 me = mapend[sfreq][2];
890 #endif
891
892 /*
893 * long hash table values
894 */
895 for(i=0;i<3;i++) {
896 int lp = l[i];
897 struct newhuff *h = (struct newhuff *)(ht+gr_infos->table_select[i]);
898
899 for(;lp;lp--,mc--) {
900 int x,y;
901
902 if(!mc) {
903 mc = *m++;
904 v = gr_infos->pow2gain[((*scf++) + (*pretab++)) << shift];
905 cb = *m++;
906 }
907 {
908 register short *val = (short *)h->table;
909 while((y=*val++)<0) {
910 if (get1bit())
911 val -= y;
912 part2remain--;
913 }
914 x = y >> 4;
915 y &= 0xf;
916 }
917 if (x == 15) {
918 max = cb;
919 part2remain -= h->linbits+1;
920 x += getbits((int)h->linbits);
921 if(get1bit())
922 *xrpnt++ = -ispow[x] * v;
923 else
924 *xrpnt++ = ispow[x] * v;
925 }
926 else if(x) {
927 max = cb;
928 if(get1bit())
929 *xrpnt++ = -ispow[x] * v;
930 else
931 *xrpnt++ = ispow[x] * v;
932 part2remain--;
933 }
934 else
935 *xrpnt++ = 0.0;
936
937 if (y == 15) {
938 max = cb;
939 part2remain -= h->linbits+1;
940 y += getbits((int)h->linbits);
941 if(get1bit())
942 *xrpnt++ = -ispow[y] * v;
943 else
944 *xrpnt++ = ispow[y] * v;
945 }
946 else if(y) {
947 max = cb;
948 if(get1bit())
949 *xrpnt++ = -ispow[y] * v;
950 else
951 *xrpnt++ = ispow[y] * v;
952 part2remain--;
953 }
954 else
955 *xrpnt++ = 0.0;
956 }
957 }
958
959 /*
960 * short (count1table) values
961 */
962 for(;l3 && (part2remain > 0);l3--) {
963 struct newhuff *h = (struct newhuff *)(htc+gr_infos->count1table_select);
964 register short *val = (short *)h->table,a;
965
966 while((a=*val++)<0) {
967 part2remain--;
968 if(part2remain < 0) {
969 part2remain++;
970 a = 0;
971 break;
972 }
973 if (get1bit())
974 val -= a;
975 }
976 for(i=0;i<4;i++) {
977 if(!(i & 1)) {
978 if(!mc) {
979 mc = *m++;
980 cb = *m++;
981 v = gr_infos->pow2gain[((*scf++) + (*pretab++)) << shift];
982 }
983 mc--;
984 }
985 if ( (a & (0x8>>i)) ) {
986 max = cb;
987 part2remain--;
988 if(part2remain < 0) {
989 part2remain++;
990 break;
991 }
992 if(get1bit())
993 *xrpnt++ = -v;
994 else
995 *xrpnt++ = v;
996 }
997 else
998 *xrpnt++ = 0.0;
999 }
1000 }
1001
1002 /*
1003 * zero part
1004 */
1005 for(i=(&xr[SBLIMIT][0]-xrpnt)>>1;i;i--) {
1006 *xrpnt++ = 0.0;
1007 *xrpnt++ = 0.0;
1008 }
1009
1010 gr_infos->maxbandl = max+1;
1011 gr_infos->maxb = longLimit[sfreq][gr_infos->maxbandl];
1012 }
1013
1014 while( part2remain > 16 ) {
1015 getbits(16); /* Dismiss stuffing Bits */
1016 part2remain -= 16;
1017 }
1018 if(part2remain > 0)
1019 getbits(part2remain);
1020 else if(part2remain < 0) {
1021 // fprintf(stderr,"mpg123: Can't rewind stream by %d bits!\n",-part2remain);
1022 return -1; /* -> error */
1023 }
1024 return 0;
1025 }
1026
1027
1028 /*
1029 * III_stereo: calculate real channel values for Joint-I-Stereo-mode
1030 */
III_i_stereo(real xr_buf[2][SBLIMIT][SSLIMIT],int * scalefac,struct gr_info_s * gr_infos,int sfreq,int ms_stereo,int lsf)1031 static void III_i_stereo(real xr_buf[2][SBLIMIT][SSLIMIT],int *scalefac,
1032 struct gr_info_s *gr_infos,int sfreq,int ms_stereo,int lsf)
1033 {
1034 real (*xr)[SBLIMIT*SSLIMIT] = (real (*)[SBLIMIT*SSLIMIT] ) xr_buf;
1035 struct bandInfoStruct *bi = (struct bandInfoStruct *)&bandInfo[sfreq];
1036 real *tabl1,*tabl2;
1037
1038 if(lsf) {
1039 int p = gr_infos->scalefac_compress & 0x1;
1040 if(ms_stereo) {
1041 tabl1 = pow1_2[p]; tabl2 = pow2_2[p];
1042 }
1043 else {
1044 tabl1 = pow1_1[p]; tabl2 = pow2_1[p];
1045 }
1046 }
1047 else {
1048 if(ms_stereo) {
1049 tabl1 = tan1_2; tabl2 = tan2_2;
1050 }
1051 else {
1052 tabl1 = tan1_1; tabl2 = tan2_1;
1053 }
1054 }
1055
1056 if (gr_infos->block_type == 2)
1057 {
1058 int lwin,do_l = 0;
1059 if( gr_infos->mixed_block_flag )
1060 do_l = 1;
1061
1062 for (lwin=0;lwin<3;lwin++) /* process each window */
1063 {
1064 /* get first band with zero values */
1065 int is_p,sb,idx,sfb = gr_infos->maxband[lwin]; /* sfb is minimal 3 for mixed mode */
1066 if(sfb > 3)
1067 do_l = 0;
1068
1069 for(;sfb<12;sfb++)
1070 {
1071 is_p = scalefac[sfb*3+lwin-gr_infos->mixed_block_flag]; /* scale: 0-15 */
1072 if(is_p != 7) {
1073 real t1,t2;
1074 sb = bi->shortDiff[sfb];
1075 idx = bi->shortIdx[sfb] + lwin;
1076 t1 = tabl1[is_p]; t2 = tabl2[is_p];
1077 for (; sb > 0; sb--,idx+=3)
1078 {
1079 real v = xr[0][idx];
1080 xr[0][idx] = v * t1;
1081 xr[1][idx] = v * t2;
1082 }
1083 }
1084 }
1085
1086 #if 1
1087 /* in the original: copy 10 to 11 , here: copy 11 to 12
1088 maybe still wrong??? (copy 12 to 13?) */
1089 is_p = scalefac[11*3+lwin-gr_infos->mixed_block_flag]; /* scale: 0-15 */
1090 sb = bi->shortDiff[12];
1091 idx = bi->shortIdx[12] + lwin;
1092 #else
1093 is_p = scalefac[10*3+lwin-gr_infos->mixed_block_flag]; /* scale: 0-15 */
1094 sb = bi->shortDiff[11];
1095 idx = bi->shortIdx[11] + lwin;
1096 #endif
1097 if(is_p != 7)
1098 {
1099 real t1,t2;
1100 t1 = tabl1[is_p]; t2 = tabl2[is_p];
1101 for ( ; sb > 0; sb--,idx+=3 )
1102 {
1103 real v = xr[0][idx];
1104 xr[0][idx] = v * t1;
1105 xr[1][idx] = v * t2;
1106 }
1107 }
1108 } /* end for(lwin; .. ; . ) */
1109
1110 if (do_l)
1111 {
1112 /* also check l-part, if ALL bands in the three windows are 'empty'
1113 * and mode = mixed_mode
1114 */
1115 int sfb = gr_infos->maxbandl;
1116 int idx = bi->longIdx[sfb];
1117
1118 for ( ; sfb<8; sfb++ )
1119 {
1120 int sb = bi->longDiff[sfb];
1121 int is_p = scalefac[sfb]; /* scale: 0-15 */
1122 if(is_p != 7) {
1123 real t1,t2;
1124 t1 = tabl1[is_p]; t2 = tabl2[is_p];
1125 for ( ; sb > 0; sb--,idx++)
1126 {
1127 real v = xr[0][idx];
1128 xr[0][idx] = v * t1;
1129 xr[1][idx] = v * t2;
1130 }
1131 }
1132 else
1133 idx += sb;
1134 }
1135 }
1136 }
1137 else /* ((gr_infos->block_type != 2)) */
1138 {
1139 int sfb = gr_infos->maxbandl;
1140 int is_p,idx = bi->longIdx[sfb];
1141 for ( ; sfb<21; sfb++)
1142 {
1143 int sb = bi->longDiff[sfb];
1144 is_p = scalefac[sfb]; /* scale: 0-15 */
1145 if(is_p != 7) {
1146 real t1,t2;
1147 t1 = tabl1[is_p]; t2 = tabl2[is_p];
1148 for ( ; sb > 0; sb--,idx++)
1149 {
1150 real v = xr[0][idx];
1151 xr[0][idx] = v * t1;
1152 xr[1][idx] = v * t2;
1153 }
1154 }
1155 else
1156 idx += sb;
1157 }
1158
1159 is_p = scalefac[20]; /* copy l-band 20 to l-band 21 */
1160 if(is_p != 7)
1161 {
1162 int sb;
1163 real t1 = tabl1[is_p],t2 = tabl2[is_p];
1164
1165 for ( sb = bi->longDiff[21]; sb > 0; sb--,idx++ )
1166 {
1167 real v = xr[0][idx];
1168 xr[0][idx] = v * t1;
1169 xr[1][idx] = v * t2;
1170 }
1171 }
1172 } /* ... */
1173 }
1174
III_antialias(real xr[SBLIMIT][SSLIMIT],struct gr_info_s * gr_infos)1175 static void III_antialias(real xr[SBLIMIT][SSLIMIT],struct gr_info_s *gr_infos)
1176 {
1177 int sblim;
1178
1179 if(gr_infos->block_type == 2)
1180 {
1181 if(!gr_infos->mixed_block_flag)
1182 return;
1183 sblim = 1;
1184 }
1185 else {
1186 sblim = gr_infos->maxb-1;
1187 }
1188
1189 /* 31 alias-reduction operations between each pair of sub-bands */
1190 /* with 8 butterflies between each pair */
1191
1192 {
1193 int sb;
1194 real *xr1=(real *) xr[1];
1195
1196 for(sb=sblim;sb;sb--,xr1+=10)
1197 {
1198 int ss;
1199 real *cs=aa_cs,*ca=aa_ca;
1200 real *xr2 = xr1;
1201
1202 for(ss=7;ss>=0;ss--)
1203 { /* upper and lower butterfly inputs */
1204 register real bu = *--xr2,bd = *xr1;
1205 *xr2 = (bu * (*cs) ) - (bd * (*ca) );
1206 *xr1++ = (bd * (*cs++) ) + (bu * (*ca++) );
1207 }
1208 }
1209 }
1210 }
1211
1212 /*
1213 DCT insipired by Jeff Tsay's DCT from the maplay package
1214 this is an optimized version with manual unroll.
1215
1216 References:
1217 [1] S. Winograd: "On Computing the Discrete Fourier Transform",
1218 Mathematics of Computation, Volume 32, Number 141, January 1978,
1219 Pages 175-199
1220 */
1221
dct36(real * inbuf,real * o1,real * o2,real * wintab,real * tsbuf)1222 static void dct36(real *inbuf,real *o1,real *o2,real *wintab,real *tsbuf)
1223 {
1224 {
1225 register real *in = inbuf;
1226
1227 in[17]+=in[16]; in[16]+=in[15]; in[15]+=in[14];
1228 in[14]+=in[13]; in[13]+=in[12]; in[12]+=in[11];
1229 in[11]+=in[10]; in[10]+=in[9]; in[9] +=in[8];
1230 in[8] +=in[7]; in[7] +=in[6]; in[6] +=in[5];
1231 in[5] +=in[4]; in[4] +=in[3]; in[3] +=in[2];
1232 in[2] +=in[1]; in[1] +=in[0];
1233
1234 in[17]+=in[15]; in[15]+=in[13]; in[13]+=in[11]; in[11]+=in[9];
1235 in[9] +=in[7]; in[7] +=in[5]; in[5] +=in[3]; in[3] +=in[1];
1236
1237
1238 {
1239
1240 #define MACRO0(v) { \
1241 real tmp; \
1242 out2[9+(v)] = (tmp = sum0 + sum1) * w[27+(v)]; \
1243 out2[8-(v)] = tmp * w[26-(v)]; } \
1244 sum0 -= sum1; \
1245 ts[SBLIMIT*(8-(v))] = out1[8-(v)] + sum0 * w[8-(v)]; \
1246 ts[SBLIMIT*(9+(v))] = out1[9+(v)] + sum0 * w[9+(v)];
1247 #define MACRO1(v) { \
1248 real sum0,sum1; \
1249 sum0 = tmp1a + tmp2a; \
1250 sum1 = (tmp1b + tmp2b) * tfcos36[(v)]; \
1251 MACRO0(v); }
1252 #define MACRO2(v) { \
1253 real sum0,sum1; \
1254 sum0 = tmp2a - tmp1a; \
1255 sum1 = (tmp2b - tmp1b) * tfcos36[(v)]; \
1256 MACRO0(v); }
1257
1258 register const real *c = COS9;
1259 register real *out2 = o2;
1260 register real *w = wintab;
1261 register real *out1 = o1;
1262 register real *ts = tsbuf;
1263
1264 real ta33,ta66,tb33,tb66;
1265
1266 ta33 = in[2*3+0] * c[3];
1267 ta66 = in[2*6+0] * c[6];
1268 tb33 = in[2*3+1] * c[3];
1269 tb66 = in[2*6+1] * c[6];
1270
1271 {
1272 real tmp1a,tmp2a,tmp1b,tmp2b;
1273 tmp1a = in[2*1+0] * c[1] + ta33 + in[2*5+0] * c[5] + in[2*7+0] * c[7];
1274 tmp1b = in[2*1+1] * c[1] + tb33 + in[2*5+1] * c[5] + in[2*7+1] * c[7];
1275 tmp2a = in[2*0+0] + in[2*2+0] * c[2] + in[2*4+0] * c[4] + ta66 + in[2*8+0] * c[8];
1276 tmp2b = in[2*0+1] + in[2*2+1] * c[2] + in[2*4+1] * c[4] + tb66 + in[2*8+1] * c[8];
1277
1278 MACRO1(0);
1279 MACRO2(8);
1280 }
1281
1282 {
1283 real tmp1a,tmp2a,tmp1b,tmp2b;
1284 tmp1a = ( in[2*1+0] - in[2*5+0] - in[2*7+0] ) * c[3];
1285 tmp1b = ( in[2*1+1] - in[2*5+1] - in[2*7+1] ) * c[3];
1286 tmp2a = ( in[2*2+0] - in[2*4+0] - in[2*8+0] ) * c[6] - in[2*6+0] + in[2*0+0];
1287 tmp2b = ( in[2*2+1] - in[2*4+1] - in[2*8+1] ) * c[6] - in[2*6+1] + in[2*0+1];
1288
1289 MACRO1(1);
1290 MACRO2(7);
1291 }
1292
1293 {
1294 real tmp1a,tmp2a,tmp1b,tmp2b;
1295 tmp1a = in[2*1+0] * c[5] - ta33 - in[2*5+0] * c[7] + in[2*7+0] * c[1];
1296 tmp1b = in[2*1+1] * c[5] - tb33 - in[2*5+1] * c[7] + in[2*7+1] * c[1];
1297 tmp2a = in[2*0+0] - in[2*2+0] * c[8] - in[2*4+0] * c[2] + ta66 + in[2*8+0] * c[4];
1298 tmp2b = in[2*0+1] - in[2*2+1] * c[8] - in[2*4+1] * c[2] + tb66 + in[2*8+1] * c[4];
1299
1300 MACRO1(2);
1301 MACRO2(6);
1302 }
1303
1304 {
1305 real tmp1a,tmp2a,tmp1b,tmp2b;
1306 tmp1a = in[2*1+0] * c[7] - ta33 + in[2*5+0] * c[1] - in[2*7+0] * c[5];
1307 tmp1b = in[2*1+1] * c[7] - tb33 + in[2*5+1] * c[1] - in[2*7+1] * c[5];
1308 tmp2a = in[2*0+0] - in[2*2+0] * c[4] + in[2*4+0] * c[8] + ta66 - in[2*8+0] * c[2];
1309 tmp2b = in[2*0+1] - in[2*2+1] * c[4] + in[2*4+1] * c[8] + tb66 - in[2*8+1] * c[2];
1310
1311 MACRO1(3);
1312 MACRO2(5);
1313 }
1314
1315 {
1316 real sum0,sum1;
1317 sum0 = in[2*0+0] - in[2*2+0] + in[2*4+0] - in[2*6+0] + in[2*8+0];
1318 sum1 = (in[2*0+1] - in[2*2+1] + in[2*4+1] - in[2*6+1] + in[2*8+1] ) * tfcos36[4];
1319 MACRO0(4);
1320 }
1321 }
1322
1323 }
1324 }
1325
1326 /*
1327 * new DCT12
1328 */
dct12(real * in,real * rawout1,real * rawout2,register real * wi,register real * ts)1329 static void dct12(real *in,real *rawout1,real *rawout2,register real *wi,register real *ts)
1330 {
1331 #define DCT12_PART1 \
1332 in5 = in[5*3]; \
1333 in5 += (in4 = in[4*3]); \
1334 in4 += (in3 = in[3*3]); \
1335 in3 += (in2 = in[2*3]); \
1336 in2 += (in1 = in[1*3]); \
1337 in1 += (in0 = in[0*3]); \
1338 \
1339 in5 += in3; in3 += in1; \
1340 \
1341 in2 *= COS6_1; \
1342 in3 *= COS6_1; \
1343
1344 #define DCT12_PART2 \
1345 in0 += in4 * COS6_2; \
1346 \
1347 in4 = in0 + in2; \
1348 in0 -= in2; \
1349 \
1350 in1 += in5 * COS6_2; \
1351 \
1352 in5 = (in1 + in3) * tfcos12[0]; \
1353 in1 = (in1 - in3) * tfcos12[2]; \
1354 \
1355 in3 = in4 + in5; \
1356 in4 -= in5; \
1357 \
1358 in2 = in0 + in1; \
1359 in0 -= in1;
1360
1361
1362 {
1363 real in0,in1,in2,in3,in4,in5;
1364 register real *out1 = rawout1;
1365 ts[SBLIMIT*0] = out1[0]; ts[SBLIMIT*1] = out1[1]; ts[SBLIMIT*2] = out1[2];
1366 ts[SBLIMIT*3] = out1[3]; ts[SBLIMIT*4] = out1[4]; ts[SBLIMIT*5] = out1[5];
1367
1368 DCT12_PART1
1369
1370 {
1371 real tmp0,tmp1 = (in0 - in4);
1372 {
1373 real tmp2 = (in1 - in5) * tfcos12[1];
1374 tmp0 = tmp1 + tmp2;
1375 tmp1 -= tmp2;
1376 }
1377 ts[(17-1)*SBLIMIT] = out1[17-1] + tmp0 * wi[11-1];
1378 ts[(12+1)*SBLIMIT] = out1[12+1] + tmp0 * wi[6+1];
1379 ts[(6 +1)*SBLIMIT] = out1[6 +1] + tmp1 * wi[1];
1380 ts[(11-1)*SBLIMIT] = out1[11-1] + tmp1 * wi[5-1];
1381 }
1382
1383 DCT12_PART2
1384
1385 ts[(17-0)*SBLIMIT] = out1[17-0] + in2 * wi[11-0];
1386 ts[(12+0)*SBLIMIT] = out1[12+0] + in2 * wi[6+0];
1387 ts[(12+2)*SBLIMIT] = out1[12+2] + in3 * wi[6+2];
1388 ts[(17-2)*SBLIMIT] = out1[17-2] + in3 * wi[11-2];
1389
1390 ts[(6+0)*SBLIMIT] = out1[6+0] + in0 * wi[0];
1391 ts[(11-0)*SBLIMIT] = out1[11-0] + in0 * wi[5-0];
1392 ts[(6+2)*SBLIMIT] = out1[6+2] + in4 * wi[2];
1393 ts[(11-2)*SBLIMIT] = out1[11-2] + in4 * wi[5-2];
1394 }
1395
1396 in++;
1397
1398 {
1399 real in0,in1,in2,in3,in4,in5;
1400 register real *out2 = rawout2;
1401
1402 DCT12_PART1
1403
1404 {
1405 real tmp0,tmp1 = (in0 - in4);
1406 {
1407 real tmp2 = (in1 - in5) * tfcos12[1];
1408 tmp0 = tmp1 + tmp2;
1409 tmp1 -= tmp2;
1410 }
1411 out2[5-1] = tmp0 * wi[11-1];
1412 out2[0+1] = tmp0 * wi[6+1];
1413 ts[(12+1)*SBLIMIT] += tmp1 * wi[1];
1414 ts[(17-1)*SBLIMIT] += tmp1 * wi[5-1];
1415 }
1416
1417 DCT12_PART2
1418
1419 out2[5-0] = in2 * wi[11-0];
1420 out2[0+0] = in2 * wi[6+0];
1421 out2[0+2] = in3 * wi[6+2];
1422 out2[5-2] = in3 * wi[11-2];
1423
1424 ts[(12+0)*SBLIMIT] += in0 * wi[0];
1425 ts[(17-0)*SBLIMIT] += in0 * wi[5-0];
1426 ts[(12+2)*SBLIMIT] += in4 * wi[2];
1427 ts[(17-2)*SBLIMIT] += in4 * wi[5-2];
1428 }
1429
1430 in++;
1431
1432 {
1433 real in0,in1,in2,in3,in4,in5;
1434 register real *out2 = rawout2;
1435 out2[12]=out2[13]=out2[14]=out2[15]=out2[16]=out2[17]=0.0;
1436
1437 DCT12_PART1
1438
1439 {
1440 real tmp0,tmp1 = (in0 - in4);
1441 {
1442 real tmp2 = (in1 - in5) * tfcos12[1];
1443 tmp0 = tmp1 + tmp2;
1444 tmp1 -= tmp2;
1445 }
1446 out2[11-1] = tmp0 * wi[11-1];
1447 out2[6 +1] = tmp0 * wi[6+1];
1448 out2[0+1] += tmp1 * wi[1];
1449 out2[5-1] += tmp1 * wi[5-1];
1450 }
1451
1452 DCT12_PART2
1453
1454 out2[11-0] = in2 * wi[11-0];
1455 out2[6 +0] = in2 * wi[6+0];
1456 out2[6 +2] = in3 * wi[6+2];
1457 out2[11-2] = in3 * wi[11-2];
1458
1459 out2[0+0] += in0 * wi[0];
1460 out2[5-0] += in0 * wi[5-0];
1461 out2[0+2] += in4 * wi[2];
1462 out2[5-2] += in4 * wi[5-2];
1463 }
1464 }
1465
1466 /*
1467 * III_hybrid
1468 */
III_hybrid(PMPSTR mp,real fsIn[SBLIMIT][SSLIMIT],real tsOut[SSLIMIT][SBLIMIT],int ch,struct gr_info_s * gr_infos)1469 static void III_hybrid( PMPSTR mp, real fsIn[SBLIMIT][SSLIMIT],real tsOut[SSLIMIT][SBLIMIT],
1470 int ch,struct gr_info_s *gr_infos)
1471 {
1472 real *tspnt = (real *) tsOut;
1473 real (*block)[2][SBLIMIT*SSLIMIT] = mp->hybrid_block;
1474 int *blc = mp->hybrid_blc;
1475 real *rawout1,*rawout2;
1476 int bt;
1477 int sb = 0;
1478
1479 {
1480 int b = blc[ch];
1481 rawout1=block[b][ch];
1482 b=-b+1;
1483 rawout2=block[b][ch];
1484 blc[ch] = b;
1485 }
1486
1487
1488 if(gr_infos->mixed_block_flag) {
1489 sb = 2;
1490 dct36(fsIn[0],rawout1,rawout2,win[0],tspnt);
1491 dct36(fsIn[1],rawout1+18,rawout2+18,win1[0],tspnt+1);
1492 rawout1 += 36; rawout2 += 36; tspnt += 2;
1493 }
1494
1495 bt = gr_infos->block_type;
1496 if(bt == 2) {
1497 for (; sb<(int)gr_infos->maxb; sb+=2,tspnt+=2,rawout1+=36,rawout2+=36) {
1498 dct12(fsIn[sb],rawout1,rawout2,win[2],tspnt);
1499 dct12(fsIn[sb+1],rawout1+18,rawout2+18,win1[2],tspnt+1);
1500 }
1501 }
1502 else {
1503 for (; sb<(int)gr_infos->maxb; sb+=2,tspnt+=2,rawout1+=36,rawout2+=36) {
1504 dct36(fsIn[sb],rawout1,rawout2,win[bt],tspnt);
1505 dct36(fsIn[sb+1],rawout1+18,rawout2+18,win1[bt],tspnt+1);
1506 }
1507 }
1508
1509 for(;sb<SBLIMIT;sb++,tspnt++) {
1510 int i;
1511 for(i=0;i<SSLIMIT;i++) {
1512 tspnt[i*SBLIMIT] = *rawout1++;
1513 *rawout2++ = 0.0;
1514 }
1515 }
1516 }
1517
1518 /*
1519 * main layer3 handler
1520 */
1521 struct III_sideinfo sideinfo;
1522
do_layer3_sideinfo(struct frame * fr)1523 int do_layer3_sideinfo(struct frame *fr)
1524 {
1525 int stereo = fr->stereo;
1526 int single = fr->single;
1527 int ms_stereo;
1528 int sfreq = fr->sampling_frequency;
1529 int granules;
1530 int ch,gr,databits;
1531
1532 if(stereo == 1) { /* stream is mono */
1533 single = 0;
1534 }
1535
1536 if(fr->mode == MPG_MD_JOINT_STEREO) {
1537 ms_stereo = fr->mode_ext & 0x2;
1538 }
1539 else
1540 ms_stereo = 0;
1541
1542
1543 if(fr->lsf) {
1544 granules = 1;
1545 if (!(III_get_side_info_2(&sideinfo,stereo,ms_stereo,sfreq,single)))
1546 return -32767;
1547 }
1548 else {
1549 granules = 2;
1550 #ifdef MPEG1
1551 if (!(III_get_side_info_1(&sideinfo,stereo,ms_stereo,sfreq,single)))
1552 return -32767;
1553 #else
1554 fprintf(stderr,"Not supported\n");
1555 #endif
1556 }
1557
1558 databits=0;
1559 for (gr=0 ; gr < granules ; ++gr) {
1560 for (ch=0; ch < stereo ; ++ch) {
1561 struct gr_info_s *gr_infos = &(sideinfo.ch[ch].gr[gr]);
1562 databits += gr_infos->part2_3_length;
1563 }
1564 }
1565 return databits-8*sideinfo.main_data_begin;
1566 }
1567
1568
1569
do_layer3(PMPSTR mp,int * pcm_point)1570 int do_layer3( PMPSTR mp,int *pcm_point)
1571 {
1572 int gr, ch, ss,clip=0;
1573 int scalefacs[2][39]; /* max 39 for short[13][3] mode, mixed: 38, long: 22 */
1574 // struct III_sideinfo sideinfo;
1575 struct frame *fr=&(mp->fr);
1576 int stereo = fr->stereo;
1577 int single = fr->single;
1578 int ms_stereo,i_stereo;
1579 int sfreq = fr->sampling_frequency;
1580 int stereo1,granules;
1581
1582 if(set_pointer(mp, (int)sideinfo.main_data_begin) == MP3_ERR)
1583 return -32767;
1584
1585 if(stereo == 1) { /* stream is mono */
1586 stereo1 = 1;
1587 single = 0;
1588 }
1589 else if(single >= 0) /* stream is stereo, but force to mono */
1590 stereo1 = 1;
1591 else
1592 stereo1 = 2;
1593
1594 if(fr->mode == MPG_MD_JOINT_STEREO) {
1595 ms_stereo = fr->mode_ext & 0x2;
1596 i_stereo = fr->mode_ext & 0x1;
1597 }
1598 else
1599 ms_stereo = i_stereo = 0;
1600
1601
1602 if(fr->lsf) {
1603 granules = 1;
1604 }
1605 else {
1606 granules = 2;
1607 }
1608
1609
1610 for (gr=0;gr<granules;gr++)
1611 {
1612 static real hybridIn[2][SBLIMIT][SSLIMIT];
1613 static real hybridOut[2][SSLIMIT][SBLIMIT];
1614
1615 {
1616 struct gr_info_s *gr_infos = &(sideinfo.ch[0].gr[gr]);
1617 long part2bits;
1618
1619 if(fr->lsf)
1620 part2bits = III_get_scale_factors_2(scalefacs[0],gr_infos,0);
1621 else {
1622 #ifdef MPEG1
1623 part2bits = III_get_scale_factors_1(scalefacs[0],gr_infos);
1624 #else
1625 fprintf(stderr,"Not supported\n");
1626 #endif
1627 }
1628
1629
1630 if(III_dequantize_sample(hybridIn[0], scalefacs[0],gr_infos,sfreq,part2bits))
1631 return 0;
1632 }
1633 if(stereo == 2) {
1634 struct gr_info_s *gr_infos = &(sideinfo.ch[1].gr[gr]);
1635 long part2bits;
1636 if(fr->lsf)
1637 part2bits = III_get_scale_factors_2(scalefacs[1],gr_infos,i_stereo);
1638 else {
1639 #ifdef MPEG1
1640 part2bits = III_get_scale_factors_1(scalefacs[1],gr_infos);
1641 #else
1642 fprintf(stderr,"Not supported\n");
1643 #endif
1644 }
1645
1646 if(III_dequantize_sample(hybridIn[1],scalefacs[1],gr_infos,sfreq,part2bits))
1647 return 0;
1648
1649 if(ms_stereo) {
1650 int i;
1651 for(i=0;i<SBLIMIT*SSLIMIT;i++) {
1652 real tmp0,tmp1;
1653 tmp0 = ((real *) hybridIn[0])[i];
1654 tmp1 = ((real *) hybridIn[1])[i];
1655 ((real *) hybridIn[1])[i] = tmp0 - tmp1;
1656 ((real *) hybridIn[0])[i] = tmp0 + tmp1;
1657 }
1658 }
1659
1660 if(i_stereo)
1661 III_i_stereo(hybridIn,scalefacs[1],gr_infos,sfreq,ms_stereo,fr->lsf);
1662
1663 if(ms_stereo || i_stereo || (single == 3) ) {
1664 if(gr_infos->maxb > sideinfo.ch[0].gr[gr].maxb)
1665 sideinfo.ch[0].gr[gr].maxb = gr_infos->maxb;
1666 else
1667 gr_infos->maxb = sideinfo.ch[0].gr[gr].maxb;
1668 }
1669
1670 switch(single) {
1671 case 3:
1672 {
1673 register int i;
1674 register real *in0 = (real *) hybridIn[0],*in1 = (real *) hybridIn[1];
1675 for(i=0;i<(int)(SSLIMIT*gr_infos->maxb);i++,in0++)
1676 *in0 = (*in0 + *in1++); /* *0.5 done by pow-scale */
1677 }
1678 break;
1679 case 1:
1680 {
1681 register int i;
1682 register real *in0 = (real *) hybridIn[0],*in1 = (real *) hybridIn[1];
1683 for(i=0;i<(int)(SSLIMIT*gr_infos->maxb);i++)
1684 *in0++ = *in1++;
1685 }
1686 break;
1687 }
1688 }
1689
1690
1691
1692 for(ch=0;ch<stereo1;ch++) {
1693 struct gr_info_s *gr_infos = &(sideinfo.ch[ch].gr[gr]);
1694 III_antialias(hybridIn[ch],gr_infos);
1695 III_hybrid(mp, hybridIn[ch], hybridOut[ch], ch,gr_infos);
1696 }
1697
1698 for(ss=0;ss<SSLIMIT;ss++) {
1699 if(single >= 0) {
1700 clip += synth_1to1_mono(mp, hybridOut[0][ss],pcm_point);
1701 }
1702 else {
1703 int p1 = *pcm_point;
1704 clip += synth_1to1(mp, hybridOut[0][ss],0,&p1);
1705 clip += synth_1to1(mp, hybridOut[1][ss],1,pcm_point);
1706 }
1707 }
1708 }
1709
1710 return 0;
1711 }
1712
1713