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- Committer: Bazaar Package Importer
- Author(s): Daniel Kobras
- Date: 2006-10-01 17:21:19 UTC
- mto: (4.1.2 edgy) (5.1.1 gutsy) (6.1.1 experimental) (1.2.1 upstream)
- mto: This revision was merged to the branch mainline in revision 5.
- Revision ID: james.westby@ubuntu.com-20061001172119-ri8szi011ldi62bi
Tags: upstream-0.60
Import upstream version 0.60
- files added:
- AUTHORS
- build
- doc
- src
- files removed:
- BENCHMARKING
- jukebox
- mpglib
- precompiled
- precompiled/linux-i386
- tools
- files modified:
- COPYING
added
removed
src/layer3.c
1
/*
2
leyer3.c: the layer 3 decoder
3
4
copyright 1995-2006 by the mpg123 project - free software under the terms of the LGPL 2.1
5
see COPYING and AUTHORS files in distribution or http://mpg123.de
6
initially written by Michael Hipp
7
8
Optimize-TODO: put short bands into the band-field without the stride of 3 reals
9
Length-optimze: unify long and short band code where it is possible
10
11
The int-vs-pointer situation has to be cleaned up.
12
*/
13
14
#include <stdlib.h>
15
#include "config.h"
16
#include "mpg123.h"
17
#include "huffman.h"
18
19
#include "common.h"
20
#include "debug.h"
21
22
#include "getbits.h"
23
24
static real ispow[8207];
25
static real aa_ca[8],aa_cs[8];
26
static real COS1[12][6];
27
static real win[4][36];
28
static real win1[4][36];
29
static real gainpow2[256+118+4];
30
#ifdef USE_3DNOW
31
real COS9[9];
32
static real COS6_1,COS6_2;
33
real tfcos36[9];
34
#else
35
static real COS9[9];
36
static real COS6_1,COS6_2;
37
static real tfcos36[9];
38
#endif
39
static real tfcos12[3];
40
#define NEW_DCT9
41
#ifdef NEW_DCT9
42
static real cos9[3],cos18[3];
43
#endif
44
45
struct bandInfoStruct {
46
int longIdx[23];
47
int longDiff[22];
48
int shortIdx[14];
49
int shortDiff[13];
50
};
51
52
int longLimit[9][23];
53
int shortLimit[9][14];
54
55
struct bandInfoStruct bandInfo[9] = {
56
57
/* MPEG 1.0 */
58
{ {0,4,8,12,16,20,24,30,36,44,52,62,74, 90,110,134,162,196,238,288,342,418,576},
59
{4,4,4,4,4,4,6,6,8, 8,10,12,16,20,24,28,34,42,50,54, 76,158},
60
{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},
61
{4,4,4,4,6,8,10,12,14,18,22,30,56} } ,
62
63
{ {0,4,8,12,16,20,24,30,36,42,50,60,72, 88,106,128,156,190,230,276,330,384,576},
64
{4,4,4,4,4,4,6,6,6, 8,10,12,16,18,22,28,34,40,46,54, 54,192},
65
{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},
66
{4,4,4,4,6,6,10,12,14,16,20,26,66} } ,
67
68
{ {0,4,8,12,16,20,24,30,36,44,54,66,82,102,126,156,194,240,296,364,448,550,576} ,
69
{4,4,4,4,4,4,6,6,8,10,12,16,20,24,30,38,46,56,68,84,102, 26} ,
70
{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} ,
71
{4,4,4,4,6,8,12,16,20,26,34,42,12} } ,
72
73
/* MPEG 2.0 */
74
{ {0,6,12,18,24,30,36,44,54,66,80,96,116,140,168,200,238,284,336,396,464,522,576},
75
{6,6,6,6,6,6,8,10,12,14,16,20,24,28,32,38,46,52,60,68,58,54 } ,
76
{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} ,
77
{4,4,4,6,6,8,10,14,18,26,32,42,18 } } ,
78
79
/* mhipp trunk has 330 -> 332 without further explanation ... */
80
{ {0,6,12,18,24,30,36,44,54,66,80,96,114,136,162,194,232,278,330,394,464,540,576},
81
{6,6,6,6,6,6,8,10,12,14,16,18,22,26,32,38,46,52,64,70,76,36 } ,
82
{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} ,
83
{4,4,4,6,8,10,12,14,18,24,32,44,12 } } ,
84
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
{0,4*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},
88
{4,4,4,6,8,10,12,14,18,24,30,40,18 } } ,
89
/* MPEG 2.5 */
90
{ {0,6,12,18,24,30,36,44,54,66,80,96,116,140,168,200,238,284,336,396,464,522,576} ,
91
{6,6,6,6,6,6,8,10,12,14,16,20,24,28,32,38,46,52,60,68,58,54},
92
{0,12,24,36,54,78,108,144,186,240,312,402,522,576},
93
{4,4,4,6,8,10,12,14,18,24,30,40,18} },
94
{ {0,6,12,18,24,30,36,44,54,66,80,96,116,140,168,200,238,284,336,396,464,522,576} ,
95
{6,6,6,6,6,6,8,10,12,14,16,20,24,28,32,38,46,52,60,68,58,54},
96
{0,12,24,36,54,78,108,144,186,240,312,402,522,576},
97
{4,4,4,6,8,10,12,14,18,24,30,40,18} },
98
{ {0,12,24,36,48,60,72,88,108,132,160,192,232,280,336,400,476,566,568,570,572,574,576},
99
{12,12,12,12,12,12,16,20,24,28,32,40,48,56,64,76,90,2,2,2,2,2},
100
{0, 24, 48, 72,108,156,216,288,372,480,486,492,498,576},
101
{8,8,8,12,16,20,24,28,36,2,2,2,26} } ,
102
};
103
104
static int mapbuf0[9][152];
105
static int mapbuf1[9][156];
106
static int mapbuf2[9][44];
107
static int *map[9][3];
108
static int *mapend[9][3];
109
110
static unsigned int n_slen2[512]; /* MPEG 2.0 slen for 'normal' mode */
111
static unsigned int i_slen2[256]; /* MPEG 2.0 slen for intensity stereo */
112
113
static real tan1_1[16],tan2_1[16],tan1_2[16],tan2_2[16];
114
static real pow1_1[2][16],pow2_1[2][16],pow1_2[2][16],pow2_2[2][16];
115
116
#ifdef GAPLESS
117
/* still a dirty hack, places in bytes (zero-based)... */
118
static unsigned long position; /* position in raw decoder bytestream */
119
static unsigned long begin; /* first byte to play == number to skip */
120
static unsigned long end; /* last byte to play */
121
static int bytified;
122
123
/* input in bytes already */
124
void layer3_gapless_init(unsigned long b, unsigned long e)
125
{
126
bytified = 0;
127
position = 0;
128
begin = b;
129
end = e;
130
debug2("layer3_gapless_init: from %lu to %lu samples", begin, end);
131
}
132
133
void layer3_gapless_set_position(unsigned long frames, struct frame* fr, struct audio_info_struct *ai)
134
{
135
position = samples_to_bytes(frames*spf(fr), fr, ai);
136
debug1("set; position now %lu", position);
137
}
138
139
void layer3_gapless_bytify(struct frame *fr, struct audio_info_struct *ai)
140
{
141
if(!bytified)
142
{
143
begin = samples_to_bytes(begin, fr, ai);
144
end = samples_to_bytes(end, fr, ai);
145
bytified = 1;
146
debug2("bytified: begin=%lu; end=%5lu", begin, end);
147
}
148
}
149
150
/*
151
take the (partially or fully) filled and remove stuff for gapless mode if needed
152
pcm_point may then be smaller than before...
153
*/
154
void layer3_gapless_buffercheck()
155
{
156
/* pcm_point bytes added since last position... */
157
unsigned long new_pos = position + pcm_point;
158
if(begin && (position < begin))
159
{
160
debug4("new_pos %lu (old: %lu), begin %lu, pcm_point %i", new_pos, position, begin, pcm_point);
161
if(new_pos < begin) pcm_point = 0; /* full of padding/delay */
162
else
163
{
164
/* we need to shift the memory to the left... */
165
debug3("old pcm_point: %i, begin %lu; good bytes: %i", pcm_point, begin, (int)(new_pos-begin));
166
pcm_point -= begin-position;
167
debug3("shifting %i bytes from %p to %p", pcm_point, pcm_sample+(int)(begin-position), pcm_sample);
168
memmove(pcm_sample, pcm_sample+(int)(begin-position), pcm_point);
169
}
170
}
171
/* I don't cover the case with both end and begin in chunk! */
172
else if(end && (new_pos > end))
173
{
174
/* either end in current chunk or chunk totally out */
175
debug2("ending at position %lu / point %i", new_pos, pcm_point);
176
if(position < end) pcm_point -= new_pos-end;
177
else pcm_point = 0;
178
debug1("set pcm_point to %i", pcm_point);
179
}
180
position = new_pos;
181
}
182
#endif
183
184
/*
185
* init tables for layer-3
186
*/
187
void init_layer3(int down_sample_sblimit)
188
{
189
int i,j,k,l;
190
191
for(i=-256;i<118+4;i++)
192
#ifdef USE_MMX
193
if(!param.down_sample)
194
gainpow2[i+256] = 16384.0 * pow((double)2.0,-0.25 * (double) (i+210) );
195
else
196
#endif
197
gainpow2[i+256] = DOUBLE_TO_REAL(pow((double)2.0,-0.25 * (double) (i+210)));
198
199
for(i=0;i<8207;i++)
200
ispow[i] = DOUBLE_TO_REAL(pow((double)i,(double)4.0/3.0));
201
202
for (i=0;i<8;i++) {
203
static double Ci[8]={-0.6,-0.535,-0.33,-0.185,-0.095,-0.041,-0.0142,-0.0037};
204
double sq=sqrt(1.0+Ci[i]*Ci[i]);
205
aa_cs[i] = DOUBLE_TO_REAL(1.0/sq);
206
aa_ca[i] = DOUBLE_TO_REAL(Ci[i]/sq);
207
}
208
209
for(i=0;i<18;i++) {
210
win[0][i] = win[1][i] = DOUBLE_TO_REAL(0.5 * sin( M_PI / 72.0 * (double) (2*(i+0) +1) ) / cos ( M_PI * (double) (2*(i+0) +19) / 72.0 ));
211
win[0][i+18] = win[3][i+18] = DOUBLE_TO_REAL(0.5 * sin( M_PI / 72.0 * (double) (2*(i+18)+1) ) / cos ( M_PI * (double) (2*(i+18)+19) / 72.0 ));
212
}
213
for(i=0;i<6;i++) {
214
win[1][i+18] = DOUBLE_TO_REAL(0.5 / cos ( M_PI * (double) (2*(i+18)+19) / 72.0 ));
215
win[3][i+12] = DOUBLE_TO_REAL(0.5 / cos ( M_PI * (double) (2*(i+12)+19) / 72.0 ));
216
win[1][i+24] = DOUBLE_TO_REAL(0.5 * sin( M_PI / 24.0 * (double) (2*i+13) ) / cos ( M_PI * (double) (2*(i+24)+19) / 72.0 ));
217
win[1][i+30] = win[3][i] = DOUBLE_TO_REAL(0.0);
218
win[3][i+6 ] = DOUBLE_TO_REAL(0.5 * sin( M_PI / 24.0 * (double) (2*i+1) ) / cos ( M_PI * (double) (2*(i+6 )+19) / 72.0 ));
219
}
220
221
for(i=0;i<9;i++)
222
COS9[i] = DOUBLE_TO_REAL(cos( M_PI / 18.0 * (double) i));
223
224
for(i=0;i<9;i++)
225
tfcos36[i] = DOUBLE_TO_REAL(0.5 / cos ( M_PI * (double) (i*2+1) / 36.0 ));
226
for(i=0;i<3;i++)
227
tfcos12[i] = DOUBLE_TO_REAL(0.5 / cos ( M_PI * (double) (i*2+1) / 12.0 ));
228
229
COS6_1 = DOUBLE_TO_REAL(cos( M_PI / 6.0 * (double) 1));
230
COS6_2 = DOUBLE_TO_REAL(cos( M_PI / 6.0 * (double) 2));
231
232
#ifdef NEW_DCT9
233
cos9[0] = DOUBLE_TO_REAL(cos(1.0*M_PI/9.0));
234
cos9[1] = DOUBLE_TO_REAL(cos(5.0*M_PI/9.0));
235
cos9[2] = DOUBLE_TO_REAL(cos(7.0*M_PI/9.0));
236
cos18[0] = DOUBLE_TO_REAL(cos(1.0*M_PI/18.0));
237
cos18[1] = DOUBLE_TO_REAL(cos(11.0*M_PI/18.0));
238
cos18[2] = DOUBLE_TO_REAL(cos(13.0*M_PI/18.0));
239
#endif
240
241
for(i=0;i<12;i++) {
242
win[2][i] = DOUBLE_TO_REAL(0.5 * sin( M_PI / 24.0 * (double) (2*i+1) ) / cos ( M_PI * (double) (2*i+7) / 24.0 ));
243
for(j=0;j<6;j++)
244
COS1[i][j] = DOUBLE_TO_REAL(cos( M_PI / 24.0 * (double) ((2*i+7)*(2*j+1)) ));
245
}
246
247
for(j=0;j<4;j++) {
248
static int len[4] = { 36,36,12,36 };
249
for(i=0;i<len[j];i+=2)
250
win1[j][i] = + win[j][i];
251
for(i=1;i<len[j];i+=2)
252
win1[j][i] = - win[j][i];
253
}
254
255
for(i=0;i<16;i++) {
256
double t = tan( (double) i * M_PI / 12.0 );
257
tan1_1[i] = DOUBLE_TO_REAL(t / (1.0+t));
258
tan2_1[i] = DOUBLE_TO_REAL(1.0 / (1.0 + t));
259
tan1_2[i] = DOUBLE_TO_REAL(M_SQRT2 * t / (1.0+t));
260
tan2_2[i] = DOUBLE_TO_REAL(M_SQRT2 / (1.0 + t));
261
262
for(j=0;j<2;j++) {
263
double base = pow(2.0,-0.25*(j+1.0));
264
double p1=1.0,p2=1.0;
265
if(i > 0) {
266
if( i & 1 )
267
p1 = pow(base,(i+1.0)*0.5);
268
else
269
p2 = pow(base,i*0.5);
270
}
271
pow1_1[j][i] = DOUBLE_TO_REAL(p1);
272
pow2_1[j][i] = DOUBLE_TO_REAL(p2);
273
pow1_2[j][i] = DOUBLE_TO_REAL(M_SQRT2 * p1);
274
pow2_2[j][i] = DOUBLE_TO_REAL(M_SQRT2 * p2);
275
}
276
}
277
278
for(j=0;j<9;j++) {
279
struct bandInfoStruct *bi = &bandInfo[j];
280
int *mp;
281
int cb,lwin;
282
int *bdf;
283
284
mp = map[j][0] = mapbuf0[j];
285
bdf = bi->longDiff;
286
for(i=0,cb = 0; cb < 8 ; cb++,i+=*bdf++) {
287
*mp++ = (*bdf) >> 1;
288
*mp++ = i;
289
*mp++ = 3;
290
*mp++ = cb;
291
}
292
bdf = bi->shortDiff+3;
293
for(cb=3;cb<13;cb++) {
294
int l = (*bdf++) >> 1;
295
for(lwin=0;lwin<3;lwin++) {
296
*mp++ = l;
297
*mp++ = i + lwin;
298
*mp++ = lwin;
299
*mp++ = cb;
300
}
301
i += 6*l;
302
}
303
mapend[j][0] = mp;
304
305
mp = map[j][1] = mapbuf1[j];
306
bdf = bi->shortDiff+0;
307
for(i=0,cb=0;cb<13;cb++) {
308
int l = (*bdf++) >> 1;
309
for(lwin=0;lwin<3;lwin++) {
310
*mp++ = l;
311
*mp++ = i + lwin;
312
*mp++ = lwin;
313
*mp++ = cb;
314
}
315
i += 6*l;
316
}
317
mapend[j][1] = mp;
318
319
mp = map[j][2] = mapbuf2[j];
320
bdf = bi->longDiff;
321
for(cb = 0; cb < 22 ; cb++) {
322
*mp++ = (*bdf++) >> 1;
323
*mp++ = cb;
324
}
325
mapend[j][2] = mp;
326
327
}
328
329
for(j=0;j<9;j++) {
330
for(i=0;i<23;i++) {
331
longLimit[j][i] = (bandInfo[j].longIdx[i] - 1 + 8) / 18 + 1;
332
if(longLimit[j][i] > (down_sample_sblimit) )
333
longLimit[j][i] = down_sample_sblimit;
334
}
335
for(i=0;i<14;i++) {
336
shortLimit[j][i] = (bandInfo[j].shortIdx[i] - 1) / 18 + 1;
337
if(shortLimit[j][i] > (down_sample_sblimit) )
338
shortLimit[j][i] = down_sample_sblimit;
339
}
340
}
341
342
for(i=0;i<5;i++) {
343
for(j=0;j<6;j++) {
344
for(k=0;k<6;k++) {
345
int n = k + j * 6 + i * 36;
346
i_slen2[n] = i|(j<<3)|(k<<6)|(3<<12);
347
}
348
}
349
}
350
for(i=0;i<4;i++) {
351
for(j=0;j<4;j++) {
352
for(k=0;k<4;k++) {
353
int n = k + j * 4 + i * 16;
354
i_slen2[n+180] = i|(j<<3)|(k<<6)|(4<<12);
355
}
356
}
357
}
358
for(i=0;i<4;i++) {
359
for(j=0;j<3;j++) {
360
int n = j + i * 3;
361
i_slen2[n+244] = i|(j<<3) | (5<<12);
362
n_slen2[n+500] = i|(j<<3) | (2<<12) | (1<<15);
363
}
364
}
365
366
for(i=0;i<5;i++) {
367
for(j=0;j<5;j++) {
368
for(k=0;k<4;k++) {
369
for(l=0;l<4;l++) {
370
int n = l + k * 4 + j * 16 + i * 80;
371
n_slen2[n] = i|(j<<3)|(k<<6)|(l<<9)|(0<<12);
372
}
373
}
374
}
375
}
376
for(i=0;i<5;i++) {
377
for(j=0;j<5;j++) {
378
for(k=0;k<4;k++) {
379
int n = k + j * 4 + i * 20;
380
n_slen2[n+400] = i|(j<<3)|(k<<6)|(1<<12);
381
}
382
}
383
}
384
}
385
386
/*
387
* read additional side information (for MPEG 1 and MPEG 2)
388
*/
389
static int III_get_side_info(struct III_sideinfo *si,int stereo,
390
int ms_stereo,long sfreq,int single,int lsf)
391
{
392
int ch, gr;
393
int powdiff = (single == 3) ? 4 : 0;
394
395
static const int tabs[2][5] = { { 2,9,5,3,4 } , { 1,8,1,2,9 } };
396
const int *tab = tabs[lsf];
397
398
si->main_data_begin = getbits(tab[1]);
399
if (stereo == 1)
400
si->private_bits = getbits_fast(tab[2]);
401
else
402
si->private_bits = getbits_fast(tab[3]);
403
404
if(!lsf) {
405
for (ch=0; ch<stereo; ch++) {
406
si->ch[ch].gr[0].scfsi = -1;
407
si->ch[ch].gr[1].scfsi = getbits_fast(4);
408
}
409
}
410
411
for (gr=0; gr<tab[0]; gr++) {
412
for (ch=0; ch<stereo; ch++) {
413
register struct gr_info_s *gr_info = &(si->ch[ch].gr[gr]);
414
415
gr_info->part2_3_length = getbits(12);
416
gr_info->big_values = getbits(9);
417
if(gr_info->big_values > 288) {
418
error("big_values too large!");
419
gr_info->big_values = 288;
420
}
421
gr_info->pow2gain = gainpow2+256 - getbits_fast(8) + powdiff;
422
if(ms_stereo)
423
gr_info->pow2gain += 2;
424
gr_info->scalefac_compress = getbits(tab[4]);
425
426
if(get1bit()) { /* window switch flag */
427
int i;
428
gr_info->block_type = getbits_fast(2);
429
gr_info->mixed_block_flag = get1bit();
430
gr_info->table_select[0] = getbits_fast(5);
431
gr_info->table_select[1] = getbits_fast(5);
432
/*
433
* table_select[2] not needed, because there is no region2,
434
* but to satisfy some verifications tools we set it either.
435
*/
436
gr_info->table_select[2] = 0;
437
for(i=0;i<3;i++)
438
gr_info->full_gain[i] = gr_info->pow2gain + (getbits_fast(3)<<3);
439
440
if(gr_info->block_type == 0) {
441
error("Blocktype == 0 and window-switching == 1 not allowed.");
442
/* exit(1); */
443
return 1;
444
}
445
446
/* region_count/start parameters are implicit in this case. */
447
if(!lsf || gr_info->block_type == 2)
448
gr_info->region1start = 36>>1;
449
else {
450
/* check this again for 2.5 and sfreq=8 */
451
if(sfreq == 8)
452
gr_info->region1start = 108>>1;
453
else
454
gr_info->region1start = 54>>1;
455
}
456
gr_info->region2start = 576>>1;
457
}
458
else {
459
int i,r0c,r1c;
460
for (i=0; i<3; i++)
461
gr_info->table_select[i] = getbits_fast(5);
462
r0c = getbits_fast(4);
463
r1c = getbits_fast(3);
464
gr_info->region1start = bandInfo[sfreq].longIdx[r0c+1] >> 1 ;
465
gr_info->region2start = bandInfo[sfreq].longIdx[r0c+1+r1c+1] >> 1;
466
gr_info->block_type = 0;
467
gr_info->mixed_block_flag = 0;
468
}
469
if(!lsf)
470
gr_info->preflag = get1bit();
471
gr_info->scalefac_scale = get1bit();
472
gr_info->count1table_select = get1bit();
473
}
474
}
475
return 0;
476
}
477
478
/*
479
* read scalefactors
480
*/
481
static int III_get_scale_factors_1(int *scf,struct gr_info_s *gr_info,int ch,int gr)
482
{
483
static const unsigned char slen[2][16] = {
484
{0, 0, 0, 0, 3, 1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4},
485
{0, 1, 2, 3, 0, 1, 2, 3, 1, 2, 3, 1, 2, 3, 2, 3}
486
};
487
int numbits;
488
int num0 = slen[0][gr_info->scalefac_compress];
489
int num1 = slen[1][gr_info->scalefac_compress];
490
491
if (gr_info->block_type == 2) {
492
int i=18;
493
numbits = (num0 + num1) * 18;
494
495
if (gr_info->mixed_block_flag) {
496
for (i=8;i;i--)
497
*scf++ = getbits_fast(num0);
498
i = 9;
499
numbits -= num0; /* num0 * 17 + num1 * 18 */
500
}
501
502
for (;i;i--)
503
*scf++ = getbits_fast(num0);
504
for (i = 18; i; i--)
505
*scf++ = getbits_fast(num1);
506
*scf++ = 0; *scf++ = 0; *scf++ = 0; /* short[13][0..2] = 0 */
507
}
508
else {
509
int i;
510
int scfsi = gr_info->scfsi;
511
512
if(scfsi < 0) { /* scfsi < 0 => granule == 0 */
513
for(i=11;i;i--)
514
*scf++ = getbits_fast(num0);
515
for(i=10;i;i--)
516
*scf++ = getbits_fast(num1);
517
numbits = (num0 + num1) * 10 + num0;
518
*scf++ = 0;
519
}
520
else {
521
numbits = 0;
522
if(!(scfsi & 0x8)) {
523
for (i=0;i<6;i++)
524
*scf++ = getbits_fast(num0);
525
numbits += num0 * 6;
526
}
527
else {
528
scf += 6;
529
}
530
531
if(!(scfsi & 0x4)) {
532
for (i=0;i<5;i++)
533
*scf++ = getbits_fast(num0);
534
numbits += num0 * 5;
535
}
536
else {
537
scf += 5;
538
}
539
540
if(!(scfsi & 0x2)) {
541
for(i=0;i<5;i++)
542
*scf++ = getbits_fast(num1);
543
numbits += num1 * 5;
544
}
545
else {
546
scf += 5;
547
}
548
549
if(!(scfsi & 0x1)) {
550
for (i=0;i<5;i++)
551
*scf++ = getbits_fast(num1);
552
numbits += num1 * 5;
553
}
554
else {
555
scf += 5;
556
}
557
*scf++ = 0; /* no l[21] in original sources */
558
}
559
}
560
return numbits;
561
}
562
563
static int III_get_scale_factors_2(int *scf,struct gr_info_s *gr_info,int i_stereo)
564
{
565
unsigned char *pnt;
566
int i,j,n=0,numbits=0;
567
unsigned int slen;
568
569
static unsigned char stab[3][6][4] = {
570
{ { 6, 5, 5,5 } , { 6, 5, 7,3 } , { 11,10,0,0} ,
571
{ 7, 7, 7,0 } , { 6, 6, 6,3 } , { 8, 8,5,0} } ,
572
{ { 9, 9, 9,9 } , { 9, 9,12,6 } , { 18,18,0,0} ,
573
{12,12,12,0 } , {12, 9, 9,6 } , { 15,12,9,0} } ,
574
{ { 6, 9, 9,9 } , { 6, 9,12,6 } , { 15,18,0,0} ,
575
{ 6,15,12,0 } , { 6,12, 9,6 } , { 6,18,9,0} } };
576
577
if(i_stereo) /* i_stereo AND second channel -> do_layer3() checks this */
578
slen = i_slen2[gr_info->scalefac_compress>>1];
579
else
580
slen = n_slen2[gr_info->scalefac_compress];
581
582
gr_info->preflag = (slen>>15) & 0x1;
583
584
n = 0;
585
if( gr_info->block_type == 2 ) {
586
n++;
587
if(gr_info->mixed_block_flag)
588
n++;
589
}
590
591
pnt = stab[n][(slen>>12)&0x7];
592
593
for(i=0;i<4;i++) {
594
int num = slen & 0x7;
595
slen >>= 3;
596
if(num) {
597
for(j=0;j<(int)(pnt[i]);j++)
598
*scf++ = getbits_fast(num);
599
numbits += pnt[i] * num;
600
}
601
else {
602
for(j=0;j<(int)(pnt[i]);j++)
603
*scf++ = 0;
604
}
605
}
606
607
n = (n << 1) + 1;
608
for(i=0;i<n;i++)
609
*scf++ = 0;
610
611
return numbits;
612
}
613
614
static 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};
615
static 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};
616
617
/*
618
* Dequantize samples (includes huffman decoding)
619
*/
620
/* 24 is enough because tab13 has max. a 19 bit huffvector */
621
#define BITSHIFT ((sizeof(long)-1)*8)
622
#define REFRESH_MASK \
623
while(num < BITSHIFT) { \
624
mask |= ((unsigned long)getbyte())<<(BITSHIFT-num); \
625
num += 8; \
626
part2remain -= 8; }
627
628
static int III_dequantize_sample(real xr[SBLIMIT][SSLIMIT],int *scf,
629
struct gr_info_s *gr_info,int sfreq,int part2bits)
630
{
631
int shift = 1 + gr_info->scalefac_scale;
632
real *xrpnt = (real *) xr;
633
int l[3],l3;
634
int part2remain = gr_info->part2_3_length - part2bits;
635
int *me;
636
637
/* mhipp tree has this split up a bit... */
638
int num=getbitoffset();
639
long mask = (long) getbits(num)<<(BITSHIFT+8-num);
640
part2remain -= num;
641
642
{
643
int bv = gr_info->big_values;
644
int region1 = gr_info->region1start;
645
int region2 = gr_info->region2start;
646
if(region1 > region2)
647
{
648
error("You got some really nasty file there... region1>region2!");
649
return 1;
650
}
651
l3 = ((576>>1)-bv)>>1;
652
/*
653
* we may lose the 'odd' bit here !!
654
* check this later again
655
*/
656
if(bv <= region1) {
657
l[0] = bv; l[1] = 0; l[2] = 0;
658
}
659
else {
660
l[0] = region1;
661
if(bv <= region2) {
662
l[1] = bv - l[0]; l[2] = 0;
663
}
664
else {
665
l[1] = region2 - l[0]; l[2] = bv - region2;
666
}
667
}
668
}
669
670
if(gr_info->block_type == 2) {
671
/*
672
* decoding with short or mixed mode BandIndex table
673
*/
674
int i,max[4];
675
int step=0,lwin=3,cb=0;
676
register real v = 0.0;
677
register int *m,mc;
678
679
if(gr_info->mixed_block_flag) {
680
max[3] = -1;
681
max[0] = max[1] = max[2] = 2;
682
m = map[sfreq][0];
683
me = mapend[sfreq][0];
684
}
685
else {
686
max[0] = max[1] = max[2] = max[3] = -1;
687
/* max[3] not really needed in this case */
688
m = map[sfreq][1];
689
me = mapend[sfreq][1];
690
}
691
692
mc = 0;
693
for(i=0;i<2;i++) {
694
int lp = l[i];
695
struct newhuff *h = ht+gr_info->table_select[i];
696
for(;lp;lp--,mc--) {
697
register int x,y;
698
if( (!mc) ) {
699
mc = *m++;
700
xrpnt = ((real *) xr) + (*m++);
701
lwin = *m++;
702
cb = *m++;
703
if(lwin == 3) {
704
v = gr_info->pow2gain[(*scf++) << shift];
705
step = 1;
706
}
707
else {
708
v = gr_info->full_gain[lwin][(*scf++) << shift];
709
step = 3;
710
}
711
}
712
{
713
register short *val = h->table;
714
REFRESH_MASK;
715
while((y=*val++)<0) {
716
if (mask < 0)
717
val -= y;
718
num--;
719
mask <<= 1;
720
}
721
x = y >> 4;
722
y &= 0xf;
723
}
724
if(x == 15 && h->linbits) {
725
max[lwin] = cb;
726
REFRESH_MASK;
727
x += ((unsigned long) mask) >> (BITSHIFT+8-h->linbits);
728
num -= h->linbits+1;
729
mask <<= h->linbits;
730
if(mask < 0)
731
*xrpnt = REAL_MUL(-ispow[x], v);
732
else
733
*xrpnt = REAL_MUL(ispow[x], v);
734
mask <<= 1;
735
}
736
else if(x) {
737
max[lwin] = cb;
738
if(mask < 0)
739
*xrpnt = REAL_MUL(-ispow[x], v);
740
else
741
*xrpnt = REAL_MUL(ispow[x], v);
742
num--;
743
mask <<= 1;
744
}
745
else
746
*xrpnt = DOUBLE_TO_REAL(0.0);
747
xrpnt += step;
748
if(y == 15 && h->linbits) {
749
max[lwin] = cb;
750
REFRESH_MASK;
751
y += ((unsigned long) mask) >> (BITSHIFT+8-h->linbits);
752
num -= h->linbits+1;
753
mask <<= h->linbits;
754
if(mask < 0)
755
*xrpnt = REAL_MUL(-ispow[y], v);
756
else
757
*xrpnt = REAL_MUL(ispow[y], v);
758
mask <<= 1;
759
}
760
else if(y) {
761
max[lwin] = cb;
762
if(mask < 0)
763
*xrpnt = REAL_MUL(-ispow[y], v);
764
else
765
*xrpnt = REAL_MUL(ispow[y], v);
766
num--;
767
mask <<= 1;
768
}
769
else
770
*xrpnt = DOUBLE_TO_REAL(0.0);
771
xrpnt += step;
772
}
773
}
774
775
for(;l3 && (part2remain+num > 0);l3--) {
776
/* not mixing code and declarations to keep C89 happy */
777
struct newhuff* h;
778
register short* val;
779
register short a;
780
/* This is only a humble hack to prevent a special segfault. */
781
/* More insight into the real workings is still needed. */
782
/* especially why there are (valid?) files that make xrpnt exceed the array with 4 bytes without segfaulting, more seems to be really bad, though. */
783
#ifdef DEBUG
784
if(!(xrpnt < &xr[SBLIMIT][0]))
785
{
786
if(param.verbose) debug2("attempted soft xrpnt overflow (%p !< %p) ?", (void*) xrpnt, (void*) &xr[SBLIMIT][0]);
787
}
788
#endif
789
if(!(xrpnt < &xr[SBLIMIT][0]+5))
790
{
791
error2("attempted xrpnt overflow (%p !< %p)", (void*) xrpnt, (void*) &xr[SBLIMIT][0]);
792
return 2;
793
}
794
h = htc+gr_info->count1table_select;
795
val = h->table;
796
797
REFRESH_MASK;
798
while((a=*val++)<0) {
799
if (mask < 0)
800
val -= a;
801
num--;
802
mask <<= 1;
803
}
804
if(part2remain+num <= 0) {
805
num -= part2remain+num;
806
break;
807
}
808
809
for(i=0;i<4;i++) {
810
if(!(i & 1)) {
811
if(!mc) {
812
mc = *m++;
813
xrpnt = ((real *) xr) + (*m++);
814
lwin = *m++;
815
cb = *m++;
816
if(lwin == 3) {
817
v = gr_info->pow2gain[(*scf++) << shift];
818
step = 1;
819
}
820
else {
821
v = gr_info->full_gain[lwin][(*scf++) << shift];
822
step = 3;
823
}
824
}
825
mc--;
826
}
827
if( (a & (0x8>>i)) ) {
828
max[lwin] = cb;
829
if(part2remain+num <= 0) {
830
break;
831
}
832
if(mask < 0)
833
*xrpnt = -v;
834
else
835
*xrpnt = v;
836
num--;
837
mask <<= 1;
838
}
839
else
840
*xrpnt = DOUBLE_TO_REAL(0.0);
841
xrpnt += step;
842
}
843
}
844
845
if(lwin < 3) { /* short band? */
846
while(1) {
847
for(;mc > 0;mc--) {
848
*xrpnt = DOUBLE_TO_REAL(0.0); xrpnt += 3; /* short band -> step=3 */
849
*xrpnt = DOUBLE_TO_REAL(0.0); xrpnt += 3;
850
}
851
if(m >= me)
852
break;
853
mc = *m++;
854
xrpnt = ((real *) xr) + *m++;
855
if(*m++ == 0)
856
break; /* optimize: field will be set to zero at the end of the function */
857
m++; /* cb */
858
}
859
}
860
861
gr_info->maxband[0] = max[0]+1;
862
gr_info->maxband[1] = max[1]+1;
863
gr_info->maxband[2] = max[2]+1;
864
gr_info->maxbandl = max[3]+1;
865
866
{
867
int rmax = max[0] > max[1] ? max[0] : max[1];
868
rmax = (rmax > max[2] ? rmax : max[2]) + 1;
869
gr_info->maxb = rmax ? shortLimit[sfreq][rmax] : longLimit[sfreq][max[3]+1];
870
}
871
872
}
873
else {
874
/*
875
* decoding with 'long' BandIndex table (block_type != 2)
876
*/
877
int *pretab = gr_info->preflag ? pretab1 : pretab2;
878
int i,max = -1;
879
int cb = 0;
880
int *m = map[sfreq][2];
881
register real v = 0.0;
882
int mc = 0;
883
884
/*
885
* long hash table values
886
*/
887
for(i=0;i<3;i++) {
888
int lp = l[i];
889
struct newhuff *h = ht+gr_info->table_select[i];
890
891
for(;lp;lp--,mc--) {
892
int x,y;
893
if(!mc) {
894
mc = *m++;
895
cb = *m++;
896
if(cb == 21)
897
v = 0.0;
898
else
899
v = gr_info->pow2gain[((*scf++) + (*pretab++)) << shift];
900
901
}
902
{
903
register short *val = h->table;
904
REFRESH_MASK;
905
while((y=*val++)<0) {
906
if (mask < 0)
907
val -= y;
908
num--;
909
mask <<= 1;
910
}
911
x = y >> 4;
912
y &= 0xf;
913
}
914
915
if (x == 15 && h->linbits) {
916
max = cb;
917
REFRESH_MASK;
918
x += ((unsigned long) mask) >> (BITSHIFT+8-h->linbits);
919
num -= h->linbits+1;
920
mask <<= h->linbits;
921
if(mask < 0)
922
*xrpnt++ = REAL_MUL(-ispow[x], v);
923
else
924
*xrpnt++ = REAL_MUL(ispow[x], v);
925
mask <<= 1;
926
}
927
else if(x) {
928
max = cb;
929
if(mask < 0)
930
*xrpnt++ = REAL_MUL(-ispow[x], v);
931
else
932
*xrpnt++ = REAL_MUL(ispow[x], v);
933
num--;
934
mask <<= 1;
935
}
936
else
937
*xrpnt++ = DOUBLE_TO_REAL(0.0);
938
939
if (y == 15 && h->linbits) {
940
max = cb;
941
REFRESH_MASK;
942
y += ((unsigned long) mask) >> (BITSHIFT+8-h->linbits);
943
num -= h->linbits+1;
944
mask <<= h->linbits;
945
if(mask < 0)
946
*xrpnt++ = REAL_MUL(-ispow[y], v);
947
else
948
*xrpnt++ = REAL_MUL(ispow[y], v);
949
mask <<= 1;
950
}
951
else if(y) {
952
max = cb;
953
if(mask < 0)
954
*xrpnt++ = REAL_MUL(-ispow[y], v);
955
else
956
*xrpnt++ = REAL_MUL(ispow[y], v);
957
num--;
958
mask <<= 1;
959
}
960
else
961
*xrpnt++ = DOUBLE_TO_REAL(0.0);
962
}
963
}
964
965
/*
966
* short (count1table) values
967
*/
968
for(;l3 && (part2remain+num > 0);l3--) {
969
struct newhuff *h = htc+gr_info->count1table_select;
970
register short *val = h->table,a;
971
972
REFRESH_MASK;
973
while((a=*val++)<0) {
974
if (mask < 0)
975
val -= a;
976
num--;
977
mask <<= 1;
978
}
979
if(part2remain+num <= 0) {
980
num -= part2remain+num;
981
break;
982
}
983
984
for(i=0;i<4;i++) {
985
if(!(i & 1)) {
986
if(!mc) {
987
mc = *m++;
988
cb = *m++;
989
if(cb == 21)
990
v = 0.0;
991
else
992
v = gr_info->pow2gain[((*scf++) + (*pretab++)) << shift];
993
}
994
mc--;
995
}
996
if ( (a & (0x8>>i)) ) {
997
max = cb;
998
if(part2remain+num <= 0) {
999
break;
1000
}
1001
if(mask < 0)
1002
*xrpnt++ = -v;
1003
else
1004
*xrpnt++ = v;
1005
num--;
1006
mask <<= 1;
1007
}
1008
else
1009
*xrpnt++ = DOUBLE_TO_REAL(0.0);
1010
}
1011
}
1012
1013
gr_info->maxbandl = max+1;
1014
gr_info->maxb = longLimit[sfreq][gr_info->maxbandl];
1015
}
1016
1017
part2remain += num;
1018
backbits(num);
1019
num = 0;
1020
1021
while(xrpnt < &xr[SBLIMIT][0])
1022
*xrpnt++ = DOUBLE_TO_REAL(0.0);
1023
1024
while( part2remain > 16 ) {
1025
getbits(16); /* Dismiss stuffing Bits */
1026
part2remain -= 16;
1027
}
1028
if(part2remain > 0)
1029
getbits(part2remain);
1030
else if(part2remain < 0) {
1031
debug1("Can't rewind stream by %d bits!",-part2remain);
1032
return 1; /* -> error */
1033
}
1034
return 0;
1035
}
1036
1037
/*
1038
* III_stereo: calculate real channel values for Joint-I-Stereo-mode
1039
*/
1040
static void III_i_stereo(real xr_buf[2][SBLIMIT][SSLIMIT],int *scalefac,
1041
struct gr_info_s *gr_info,int sfreq,int ms_stereo,int lsf)
1042
{
1043
real (*xr)[SBLIMIT*SSLIMIT] = (real (*)[SBLIMIT*SSLIMIT] ) xr_buf;
1044
struct bandInfoStruct *bi = &bandInfo[sfreq];
1045
1046
const real *tab1,*tab2;
1047
1048
#if 1
1049
int tab;
1050
/* TODO: optimize as static */
1051
static const real *tabs[3][2][2] = {
1052
{ { tan1_1,tan2_1 } , { tan1_2,tan2_2 } },
1053
{ { pow1_1[0],pow2_1[0] } , { pow1_2[0],pow2_2[0] } } ,
1054
{ { pow1_1[1],pow2_1[1] } , { pow1_2[1],pow2_2[1] } }
1055
};
1056
1057
tab = lsf + (gr_info->scalefac_compress & lsf);
1058
tab1 = tabs[tab][ms_stereo][0];
1059
tab2 = tabs[tab][ms_stereo][1];
1060
#else
1061
if(lsf) {
1062
int p = gr_info->scalefac_compress & 0x1;
1063
if(ms_stereo) {
1064
tab1 = pow1_2[p]; tab2 = pow2_2[p];
1065
}
1066
else {
1067
tab1 = pow1_1[p]; tab2 = pow2_1[p];
1068
}
1069
}
1070
else {
1071
if(ms_stereo) {
1072
tab1 = tan1_2; tab2 = tan2_2;
1073
}
1074
else {
1075
tab1 = tan1_1; tab2 = tan2_1;
1076
}
1077
}
1078
#endif
1079
1080
if (gr_info->block_type == 2) {
1081
int lwin,do_l = 0;
1082
if( gr_info->mixed_block_flag )
1083
do_l = 1;
1084
1085
for (lwin=0;lwin<3;lwin++) { /* process each window */
1086
/* get first band with zero values */
1087
int is_p,sb,idx,sfb = gr_info->maxband[lwin]; /* sfb is minimal 3 for mixed mode */
1088
if(sfb > 3)
1089
do_l = 0;
1090
1091
for(;sfb<12;sfb++) {
1092
is_p = scalefac[sfb*3+lwin-gr_info->mixed_block_flag]; /* scale: 0-15 */
1093
if(is_p != 7) {
1094
real t1,t2;
1095
sb = bi->shortDiff[sfb];
1096
idx = bi->shortIdx[sfb] + lwin;
1097
t1 = tab1[is_p]; t2 = tab2[is_p];
1098
for (; sb > 0; sb--,idx+=3) {
1099
real v = xr[0][idx];
1100
xr[0][idx] = REAL_MUL(v, t1);
1101
xr[1][idx] = REAL_MUL(v, t2);
1102
}
1103
}
1104
}
1105
1106
#if 1
1107
/* in the original: copy 10 to 11 , here: copy 11 to 12
1108
maybe still wrong??? (copy 12 to 13?) */
1109
is_p = scalefac[11*3+lwin-gr_info->mixed_block_flag]; /* scale: 0-15 */
1110
sb = bi->shortDiff[12];
1111
idx = bi->shortIdx[12] + lwin;
1112
#else
1113
is_p = scalefac[10*3+lwin-gr_info->mixed_block_flag]; /* scale: 0-15 */
1114
sb = bi->shortDiff[11];
1115
idx = bi->shortIdx[11] + lwin;
1116
#endif
1117
if(is_p != 7) {
1118
real t1,t2;
1119
t1 = tab1[is_p]; t2 = tab2[is_p];
1120
for ( ; sb > 0; sb--,idx+=3 ) {
1121
real v = xr[0][idx];
1122
xr[0][idx] = REAL_MUL(v, t1);
1123
xr[1][idx] = REAL_MUL(v, t2);
1124
}
1125
}
1126
} /* end for(lwin; .. ; . ) */
1127
1128
/* also check l-part, if ALL bands in the three windows are 'empty'
1129
* and mode = mixed_mode
1130
*/
1131
if (do_l) {
1132
int sfb = gr_info->maxbandl;
1133
int idx = bi->longIdx[sfb];
1134
1135
for ( ; sfb<8; sfb++ ) {
1136
int sb = bi->longDiff[sfb];
1137
int is_p = scalefac[sfb]; /* scale: 0-15 */
1138
if(is_p != 7) {
1139
real t1,t2;
1140
t1 = tab1[is_p]; t2 = tab2[is_p];
1141
for ( ; sb > 0; sb--,idx++) {
1142
real v = xr[0][idx];
1143
xr[0][idx] = REAL_MUL(v, t1);
1144
xr[1][idx] = REAL_MUL(v, t2);
1145
}
1146
}
1147
else
1148
idx += sb;
1149
}
1150
}
1151
}
1152
else { /* ((gr_info->block_type != 2)) */
1153
int sfb = gr_info->maxbandl;
1154
int is_p,idx;
1155
if(sfb > 21) return; /* tightened fix for CVE-2006-1655 */
1156
idx = bi->longIdx[sfb];
1157
for ( ; sfb<21; sfb++) {
1158
int sb = bi->longDiff[sfb];
1159
is_p = scalefac[sfb]; /* scale: 0-15 */
1160
if(is_p != 7) {
1161
real t1,t2;
1162
t1 = tab1[is_p]; t2 = tab2[is_p];
1163
for ( ; sb > 0; sb--,idx++) {
1164
real v = xr[0][idx];
1165
xr[0][idx] = REAL_MUL(v, t1);
1166
xr[1][idx] = REAL_MUL(v, t2);
1167
}
1168
}
1169
else
1170
idx += sb;
1171
}
1172
1173
is_p = scalefac[20];
1174
if(is_p != 7) { /* copy l-band 20 to l-band 21 */
1175
int sb;
1176
real t1 = tab1[is_p],t2 = tab2[is_p];
1177
1178
for ( sb = bi->longDiff[21]; sb > 0; sb--,idx++ ) {
1179
real v = xr[0][idx];
1180
xr[0][idx] = REAL_MUL(v, t1);
1181
xr[1][idx] = REAL_MUL(v, t2);
1182
}
1183
}
1184
} /* ... */
1185
}
1186
1187
static void III_antialias(real xr[SBLIMIT][SSLIMIT],struct gr_info_s *gr_info) {
1188
int sblim;
1189
1190
if(gr_info->block_type == 2) {
1191
if(!gr_info->mixed_block_flag)
1192
return;
1193
sblim = 1;
1194
}
1195
else {
1196
sblim = gr_info->maxb-1;
1197
}
1198
1199
/* 31 alias-reduction operations between each pair of sub-bands */
1200
/* with 8 butterflies between each pair */
1201
1202
{
1203
int sb;
1204
real *xr1=(real *) xr[1];
1205
1206
for(sb=sblim;sb;sb--,xr1+=10) {
1207
int ss;
1208
real *cs=aa_cs,*ca=aa_ca;
1209
real *xr2 = xr1;
1210
1211
for(ss=7;ss>=0;ss--)
1212
{ /* upper and lower butterfly inputs */
1213
register real bu = *--xr2,bd = *xr1;
1214
*xr2 = REAL_MUL(bu, *cs) - REAL_MUL(bd, *ca);
1215
*xr1++ = REAL_MUL(bd, *cs++) + REAL_MUL(bu, *ca++);
1216
}
1217
}
1218
}
1219
}
1220
1221
/*
1222
// This is an optimized DCT from Jeff Tsay's maplay 1.2+ package.
1223
// Saved one multiplication by doing the 'twiddle factor' stuff
1224
// together with the window mul. (MH)
1225
//
1226
// This uses Byeong Gi Lee's Fast Cosine Transform algorithm, but the
1227
// 9 point IDCT needs to be reduced further. Unfortunately, I don't
1228
// know how to do that, because 9 is not an even number. - Jeff.
1229
//
1230
//////////////////////////////////////////////////////////////////
1231
//
1232
// 9 Point Inverse Discrete Cosine Transform
1233
//
1234
// This piece of code is Copyright 1997 Mikko Tommila and is freely usable
1235
// by anybody. The algorithm itself is of course in the public domain.
1236
//
1237
// Again derived heuristically from the 9-point WFTA.
1238
//
1239
// The algorithm is optimized (?) for speed, not for small rounding errors or
1240
// good readability.
1241
//
1242
// 36 additions, 11 multiplications
1243
//
1244
// Again this is very likely sub-optimal.
1245
//
1246
// The code is optimized to use a minimum number of temporary variables,
1247
// so it should compile quite well even on 8-register Intel x86 processors.
1248
// This makes the code quite obfuscated and very difficult to understand.
1249
//
1250
// References:
1251
// [1] S. Winograd: "On Computing the Discrete Fourier Transform",
1252
// Mathematics of Computation, Volume 32, Number 141, January 1978,
1253
// Pages 175-199
1254
*/
1255
1256
/*------------------------------------------------------------------*/
1257
/* */
1258
/* Function: Calculation of the inverse MDCT */
1259
/* */
1260
/*------------------------------------------------------------------*/
1261
#ifdef USE_3DNOW
1262
void dct36(real *inbuf,real *o1,real *o2,real *wintab,real *tsbuf)
1263
#else
1264
static void dct36(real *inbuf,real *o1,real *o2,real *wintab,real *tsbuf)
1265
#endif
1266
{
1267
#ifdef NEW_DCT9
1268
real tmp[18];
1269
#endif
1270
1271
{
1272
register real *in = inbuf;
1273
1274
in[17]+=in[16]; in[16]+=in[15]; in[15]+=in[14];
1275
in[14]+=in[13]; in[13]+=in[12]; in[12]+=in[11];
1276
in[11]+=in[10]; in[10]+=in[9]; in[9] +=in[8];
1277
in[8] +=in[7]; in[7] +=in[6]; in[6] +=in[5];
1278
in[5] +=in[4]; in[4] +=in[3]; in[3] +=in[2];
1279
in[2] +=in[1]; in[1] +=in[0];
1280
1281
in[17]+=in[15]; in[15]+=in[13]; in[13]+=in[11]; in[11]+=in[9];
1282
in[9] +=in[7]; in[7] +=in[5]; in[5] +=in[3]; in[3] +=in[1];
1283
1284
1285
#ifdef NEW_DCT9
1286
#if 1
1287
{
1288
real t3;
1289
{
1290
real t0, t1, t2;
1291
1292
t0 = REAL_MUL(COS6_2, (in[8] + in[16] - in[4]));
1293
t1 = REAL_MUL(COS6_2, in[12]);
1294
1295
t3 = in[0];
1296
t2 = t3 - t1 - t1;
1297
tmp[1] = tmp[7] = t2 - t0;
1298
tmp[4] = t2 + t0 + t0;
1299
t3 += t1;
1300
1301
t2 = REAL_MUL(COS6_1, (in[10] + in[14] - in[2]));
1302
tmp[1] -= t2;
1303
tmp[7] += t2;
1304
}
1305
{
1306
real t0, t1, t2;
1307
1308
t0 = REAL_MUL(cos9[0], (in[4] + in[8] ));
1309
t1 = REAL_MUL(cos9[1], (in[8] - in[16]));
1310
t2 = REAL_MUL(cos9[2], (in[4] + in[16]));
1311
1312
tmp[2] = tmp[6] = t3 - t0 - t2;
1313
tmp[0] = tmp[8] = t3 + t0 + t1;
1314
tmp[3] = tmp[5] = t3 - t1 + t2;
1315
}
1316
}
1317
{
1318
real t1, t2, t3;
1319
1320
t1 = REAL_MUL(cos18[0], (in[2] + in[10]));
1321
t2 = REAL_MUL(cos18[1], (in[10] - in[14]));
1322
t3 = REAL_MUL(COS6_1, in[6]);
1323
1324
{
1325
real t0 = t1 + t2 + t3;
1326
tmp[0] += t0;
1327
tmp[8] -= t0;
1328
}
1329
1330
t2 -= t3;
1331
t1 -= t3;
1332
1333
t3 = REAL_MUL(cos18[2], (in[2] + in[14]));
1334
1335
t1 += t3;
1336
tmp[3] += t1;
1337
tmp[5] -= t1;
1338
1339
t2 -= t3;
1340
tmp[2] += t2;
1341
tmp[6] -= t2;
1342
}
1343
1344
#else
1345
{
1346
real t0, t1, t2, t3, t4, t5, t6, t7;
1347
1348
t1 = REAL_MUL(COS6_2, in[12]);
1349
t2 = REAL_MUL(COS6_2, (in[8] + in[16] - in[4]));
1350
1351
t3 = in[0] + t1;
1352
t4 = in[0] - t1 - t1;
1353
t5 = t4 - t2;
1354
tmp[4] = t4 + t2 + t2;
1355
1356
t0 = REAL_MUL(cos9[0], (in[4] + in[8]));
1357
t1 = REAL_MUL(cos9[1], (in[8] - in[16]));
1358
1359
t2 = REAL_MUL(cos9[2], (in[4] + in[16]));
1360
1361
t6 = t3 - t0 - t2;
1362
t0 += t3 + t1;
1363
t3 += t2 - t1;
1364
1365
t2 = REAL_MUL(cos18[0], (in[2] + in[10]));
1366
t4 = REAL_MUL(cos18[1], (in[10] - in[14]));
1367
t7 = REAL_MUL(COS6_1, in[6]);
1368
1369
t1 = t2 + t4 + t7;
1370
tmp[0] = t0 + t1;
1371
tmp[8] = t0 - t1;
1372
t1 = REAL_MUL(cos18[2], (in[2] + in[14]));
1373
t2 += t1 - t7;
1374
1375
tmp[3] = t3 + t2;
1376
t0 = REAL_MUL(COS6_1, (in[10] + in[14] - in[2]));
1377
tmp[5] = t3 - t2;
1378
1379
t4 -= t1 + t7;
1380
1381
tmp[1] = t5 - t0;
1382
tmp[7] = t5 + t0;
1383
tmp[2] = t6 + t4;
1384
tmp[6] = t6 - t4;
1385
}
1386
#endif
1387
1388
{
1389
real t0, t1, t2, t3, t4, t5, t6, t7;
1390
1391
t1 = REAL_MUL(COS6_2, in[13]);
1392
t2 = REAL_MUL(COS6_2, (in[9] + in[17] - in[5]));
1393
1394
t3 = in[1] + t1;
1395
t4 = in[1] - t1 - t1;
1396
t5 = t4 - t2;
1397
1398
t0 = REAL_MUL(cos9[0], (in[5] + in[9]));
1399
t1 = REAL_MUL(cos9[1], (in[9] - in[17]));
1400
1401
tmp[13] = REAL_MUL((t4 + t2 + t2), tfcos36[17-13]);
1402
t2 = REAL_MUL(cos9[2], (in[5] + in[17]));
1403
1404
t6 = t3 - t0 - t2;
1405
t0 += t3 + t1;
1406
t3 += t2 - t1;
1407
1408
t2 = REAL_MUL(cos18[0], (in[3] + in[11]));
1409
t4 = REAL_MUL(cos18[1], (in[11] - in[15]));
1410
t7 = REAL_MUL(COS6_1, in[7]);
1411
1412
t1 = t2 + t4 + t7;
1413
tmp[17] = REAL_MUL((t0 + t1), tfcos36[17-17]);
1414
tmp[9] = REAL_MUL((t0 - t1), tfcos36[17-9]);
1415
t1 = REAL_MUL(cos18[2], (in[3] + in[15]));
1416
t2 += t1 - t7;
1417
1418
tmp[14] = REAL_MUL((t3 + t2), tfcos36[17-14]);
1419
t0 = REAL_MUL(COS6_1, (in[11] + in[15] - in[3]));
1420
tmp[12] = REAL_MUL((t3 - t2), tfcos36[17-12]);
1421
1422
t4 -= t1 + t7;
1423
1424
tmp[16] = REAL_MUL((t5 - t0), tfcos36[17-16]);
1425
tmp[10] = REAL_MUL((t5 + t0), tfcos36[17-10]);
1426
tmp[15] = REAL_MUL((t6 + t4), tfcos36[17-15]);
1427
tmp[11] = REAL_MUL((t6 - t4), tfcos36[17-11]);
1428
}
1429
1430
#define MACRO(v) { \
1431
real tmpval; \
1432
tmpval = tmp[(v)] + tmp[17-(v)]; \
1433
out2[9+(v)] = REAL_MUL(tmpval, w[27+(v)]); \
1434
out2[8-(v)] = REAL_MUL(tmpval, w[26-(v)]); \
1435
tmpval = tmp[(v)] - tmp[17-(v)]; \
1436
ts[SBLIMIT*(8-(v))] = out1[8-(v)] + REAL_MUL(tmpval, w[8-(v)]); \
1437
ts[SBLIMIT*(9+(v))] = out1[9+(v)] + REAL_MUL(tmpval, w[9+(v)]); }
1438
1439
{
1440
register real *out2 = o2;
1441
register real *w = wintab;
1442
register real *out1 = o1;
1443
register real *ts = tsbuf;
1444
1445
MACRO(0);
1446
MACRO(1);
1447
MACRO(2);
1448
MACRO(3);
1449
MACRO(4);
1450
MACRO(5);
1451
MACRO(6);
1452
MACRO(7);
1453
MACRO(8);
1454
}
1455
1456
#else
1457
1458
{
1459
1460
#define MACRO0(v) { \
1461
real tmp; \
1462
out2[9+(v)] = REAL_MUL((tmp = sum0 + sum1), w[27+(v)]); \
1463
out2[8-(v)] = REAL_MUL(tmp, w[26-(v)]); } \
1464
sum0 -= sum1; \
1465
ts[SBLIMIT*(8-(v))] = out1[8-(v)] + REAL_MUL(sum0, w[8-(v)]); \
1466
ts[SBLIMIT*(9+(v))] = out1[9+(v)] + REAL_MUL(sum0, w[9+(v)]);
1467
#define MACRO1(v) { \
1468
real sum0,sum1; \
1469
sum0 = tmp1a + tmp2a; \
1470
sum1 = REAL_MUL((tmp1b + tmp2b), tfcos36[(v)]); \
1471
MACRO0(v); }
1472
#define MACRO2(v) { \
1473
real sum0,sum1; \
1474
sum0 = tmp2a - tmp1a; \
1475
sum1 = REAL_MUL((tmp2b - tmp1b), tfcos36[(v)]); \
1476
MACRO0(v); }
1477
1478
register const real *c = COS9;
1479
register real *out2 = o2;
1480
register real *w = wintab;
1481
register real *out1 = o1;
1482
register real *ts = tsbuf;
1483
1484
real ta33,ta66,tb33,tb66;
1485
1486
ta33 = REAL_MUL(in[2*3+0], c[3]);
1487
ta66 = REAL_MUL(in[2*6+0], c[6]);
1488
tb33 = REAL_MUL(in[2*3+1], c[3]);
1489
tb66 = REAL_MUL(in[2*6+1], c[6]);
1490
1491
{
1492
real tmp1a,tmp2a,tmp1b,tmp2b;
1493
tmp1a = REAL_MUL(in[2*1+0], c[1]) + ta33 + REAL_MUL(in[2*5+0], c[5]) + REAL_MUL(in[2*7+0], c[7]);
1494
tmp1b = REAL_MUL(in[2*1+1], c[1]) + tb33 + REAL_MUL(in[2*5+1], c[5]) + REAL_MUL(in[2*7+1], c[7]);
1495
tmp2a = REAL_MUL(in[2*2+0], c[2]) + REAL_MUL(in[2*4+0], c[4]) + ta66 + REAL_MUL(in[2*8+0], c[8]);
1496
tmp2b = REAL_MUL(in[2*2+1], c[2]) + REAL_MUL(in[2*4+1], c[4]) + tb66 + REAL_MUL(in[2*8+1], c[8]);
1497
1498
MACRO1(0);
1499
MACRO2(8);
1500
}
1501
1502
{
1503
real tmp1a,tmp2a,tmp1b,tmp2b;
1504
tmp1a = REAL_MUL(( in[2*1+0] - in[2*5+0] - in[2*7+0] ), c[3]);
1505
tmp1b = REAL_MUL(( in[2*1+1] - in[2*5+1] - in[2*7+1] ), c[3]);
1506
tmp2a = REAL_MUL(( in[2*2+0] - in[2*4+0] - in[2*8+0] ), c[6]) - in[2*6+0] + in[2*0+0];
1507
tmp2b = REAL_MUL(( in[2*2+1] - in[2*4+1] - in[2*8+1] ), c[6]) - in[2*6+1] + in[2*0+1];
1508
1509
MACRO1(1);
1510
MACRO2(7);
1511
}
1512
1513
{
1514
real tmp1a,tmp2a,tmp1b,tmp2b;
1515
tmp1a = REAL_MUL(in[2*1+0], c[5]) - ta33 - REAL_MUL(in[2*5+0], c[7]) + REAL_MUL(in[2*7+0], c[1]);
1516
tmp1b = REAL_MUL(in[2*1+1], c[5]) - tb33 - REAL_MUL(in[2*5+1], c[7]) + REAL_MUL(in[2*7+1], c[1]);
1517
tmp2a = - REAL_MUL(in[2*2+0], c[8]) - REAL_MUL(in[2*4+0], c[2]) + ta66 + REAL_MUL(in[2*8+0], c[4]);
1518
tmp2b = - REAL_MUL(in[2*2+1], c[8]) - REAL_MUL(in[2*4+1], c[2]) + tb66 + REAL_MUL(in[2*8+1], c[4]);
1519
1520
MACRO1(2);
1521
MACRO2(6);
1522
}
1523
1524
{
1525
real tmp1a,tmp2a,tmp1b,tmp2b;
1526
tmp1a = REAL_MUL(in[2*1+0], c[7]) - ta33 + REAL_MUL(in[2*5+0], c[1]) - REAL_MUL(in[2*7+0], c[5]);
1527
tmp1b = REAL_MUL(in[2*1+1], c[7]) - tb33 + REAL_MUL(in[2*5+1], c[1]) - REAL_MUL(in[2*7+1], c[5]);
1528
tmp2a = - REAL_MUL(in[2*2+0], c[4]) + REAL_MUL(in[2*4+0], c[8]) + ta66 - REAL_MUL(in[2*8+0], c[2]);
1529
tmp2b = - REAL_MUL(in[2*2+1], c[4]) + REAL_MUL(in[2*4+1], c[8]) + tb66 - REAL_MUL(in[2*8+1], c[2]);
1530
1531
MACRO1(3);
1532
MACRO2(5);
1533
}
1534
1535
{
1536
real sum0,sum1;
1537
sum0 = in[2*0+0] - in[2*2+0] + in[2*4+0] - in[2*6+0] + in[2*8+0];
1538
sum1 = REAL_MUL((in[2*0+1] - in[2*2+1] + in[2*4+1] - in[2*6+1] + in[2*8+1] ), tfcos36[4]);
1539
MACRO0(4);
1540
}
1541
}
1542
#endif
1543
1544
}
1545
}
1546
1547
/*
1548
* new DCT12
1549
*/
1550
static void dct12(real *in,real *rawout1,real *rawout2,register real *wi,register real *ts)
1551
{
1552
#define DCT12_PART1 \
1553
in5 = in[5*3]; \
1554
in5 += (in4 = in[4*3]); \
1555
in4 += (in3 = in[3*3]); \
1556
in3 += (in2 = in[2*3]); \
1557
in2 += (in1 = in[1*3]); \
1558
in1 += (in0 = in[0*3]); \
1559
\
1560
in5 += in3; in3 += in1; \
1561
\
1562
in2 = REAL_MUL(in2, COS6_1); \
1563
in3 = REAL_MUL(in3, COS6_1); \
1564
1565
#define DCT12_PART2 \
1566
in0 += REAL_MUL(in4, COS6_2); \
1567
\
1568
in4 = in0 + in2; \
1569
in0 -= in2; \
1570
\
1571
in1 += REAL_MUL(in5, COS6_2); \
1572
\
1573
in5 = REAL_MUL((in1 + in3), tfcos12[0]); \
1574
in1 = REAL_MUL((in1 - in3), tfcos12[2]); \
1575
\
1576
in3 = in4 + in5; \
1577
in4 -= in5; \
1578
\
1579
in2 = in0 + in1; \
1580
in0 -= in1;
1581
1582
1583
{
1584
real in0,in1,in2,in3,in4,in5;
1585
register real *out1 = rawout1;
1586
ts[SBLIMIT*0] = out1[0]; ts[SBLIMIT*1] = out1[1]; ts[SBLIMIT*2] = out1[2];
1587
ts[SBLIMIT*3] = out1[3]; ts[SBLIMIT*4] = out1[4]; ts[SBLIMIT*5] = out1[5];
1588
1589
DCT12_PART1
1590
1591
{
1592
real tmp0,tmp1 = (in0 - in4);
1593
{
1594
real tmp2 = REAL_MUL((in1 - in5), tfcos12[1]);
1595
tmp0 = tmp1 + tmp2;
1596
tmp1 -= tmp2;
1597
}
1598
ts[(17-1)*SBLIMIT] = out1[17-1] + REAL_MUL(tmp0, wi[11-1]);
1599
ts[(12+1)*SBLIMIT] = out1[12+1] + REAL_MUL(tmp0, wi[6+1]);
1600
ts[(6 +1)*SBLIMIT] = out1[6 +1] + REAL_MUL(tmp1, wi[1]);
1601
ts[(11-1)*SBLIMIT] = out1[11-1] + REAL_MUL(tmp1, wi[5-1]);
1602
}
1603
1604
DCT12_PART2
1605
1606
ts[(17-0)*SBLIMIT] = out1[17-0] + REAL_MUL(in2, wi[11-0]);
1607
ts[(12+0)*SBLIMIT] = out1[12+0] + REAL_MUL(in2, wi[6+0]);
1608
ts[(12+2)*SBLIMIT] = out1[12+2] + REAL_MUL(in3, wi[6+2]);
1609
ts[(17-2)*SBLIMIT] = out1[17-2] + REAL_MUL(in3, wi[11-2]);
1610
1611
ts[(6 +0)*SBLIMIT] = out1[6+0] + REAL_MUL(in0, wi[0]);
1612
ts[(11-0)*SBLIMIT] = out1[11-0] + REAL_MUL(in0, wi[5-0]);
1613
ts[(6 +2)*SBLIMIT] = out1[6+2] + REAL_MUL(in4, wi[2]);
1614
ts[(11-2)*SBLIMIT] = out1[11-2] + REAL_MUL(in4, wi[5-2]);
1615
}
1616
1617
in++;
1618
1619
{
1620
real in0,in1,in2,in3,in4,in5;
1621
register real *out2 = rawout2;
1622
1623
DCT12_PART1
1624
1625
{
1626
real tmp0,tmp1 = (in0 - in4);
1627
{
1628
real tmp2 = REAL_MUL((in1 - in5), tfcos12[1]);
1629
tmp0 = tmp1 + tmp2;
1630
tmp1 -= tmp2;
1631
}
1632
out2[5-1] = REAL_MUL(tmp0, wi[11-1]);
1633
out2[0+1] = REAL_MUL(tmp0, wi[6+1]);
1634
ts[(12+1)*SBLIMIT] += REAL_MUL(tmp1, wi[1]);
1635
ts[(17-1)*SBLIMIT] += REAL_MUL(tmp1, wi[5-1]);
1636
}
1637
1638
DCT12_PART2
1639
1640
out2[5-0] = REAL_MUL(in2, wi[11-0]);
1641
out2[0+0] = REAL_MUL(in2, wi[6+0]);
1642
out2[0+2] = REAL_MUL(in3, wi[6+2]);
1643
out2[5-2] = REAL_MUL(in3, wi[11-2]);
1644
1645
ts[(12+0)*SBLIMIT] += REAL_MUL(in0, wi[0]);
1646
ts[(17-0)*SBLIMIT] += REAL_MUL(in0, wi[5-0]);
1647
ts[(12+2)*SBLIMIT] += REAL_MUL(in4, wi[2]);
1648
ts[(17-2)*SBLIMIT] += REAL_MUL(in4, wi[5-2]);
1649
}
1650
1651
in++;
1652
1653
{
1654
real in0,in1,in2,in3,in4,in5;
1655
register real *out2 = rawout2;
1656
out2[12]=out2[13]=out2[14]=out2[15]=out2[16]=out2[17]=0.0;
1657
1658
DCT12_PART1
1659
1660
{
1661
real tmp0,tmp1 = (in0 - in4);
1662
{
1663
real tmp2 = REAL_MUL((in1 - in5), tfcos12[1]);
1664
tmp0 = tmp1 + tmp2;
1665
tmp1 -= tmp2;
1666
}
1667
out2[11-1] = REAL_MUL(tmp0, wi[11-1]);
1668
out2[6 +1] = REAL_MUL(tmp0, wi[6+1]);
1669
out2[0+1] += REAL_MUL(tmp1, wi[1]);
1670
out2[5-1] += REAL_MUL(tmp1, wi[5-1]);
1671
}
1672
1673
DCT12_PART2
1674
1675
out2[11-0] = REAL_MUL(in2, wi[11-0]);
1676
out2[6 +0] = REAL_MUL(in2, wi[6+0]);
1677
out2[6 +2] = REAL_MUL(in3, wi[6+2]);
1678
out2[11-2] = REAL_MUL(in3, wi[11-2]);
1679
1680
out2[0+0] += REAL_MUL(in0, wi[0]);
1681
out2[5-0] += REAL_MUL(in0, wi[5-0]);
1682
out2[0+2] += REAL_MUL(in4, wi[2]);
1683
out2[5-2] += REAL_MUL(in4, wi[5-2]);
1684
}
1685
}
1686
1687
/*
1688
* III_hybrid
1689
*/
1690
#ifdef USE_3DNOW
1691
static void III_hybrid(real fsIn[SBLIMIT][SSLIMIT],real tsOut[SSLIMIT][SBLIMIT],int ch,struct gr_info_s *gr_info,struct frame *fr)
1692
#else
1693
static void III_hybrid(real fsIn[SBLIMIT][SSLIMIT],real tsOut[SSLIMIT][SBLIMIT],
1694
int ch,struct gr_info_s *gr_info)
1695
#endif
1696
{
1697
static real block[2][2][SBLIMIT*SSLIMIT] = { { { 0, } } };
1698
static int blc[2]={0,0};
1699
1700
real *tspnt = (real *) tsOut;
1701
real *rawout1,*rawout2;
1702
int bt,sb = 0;
1703
1704
{
1705
int b = blc[ch];
1706
rawout1=block[b][ch];
1707
b=-b+1;
1708
rawout2=block[b][ch];
1709
blc[ch] = b;
1710
}
1711
1712
if(gr_info->mixed_block_flag) {
1713
sb = 2;
1714
#ifdef USE_3DNOW
1715
(fr->dct36)(fsIn[0],rawout1,rawout2,win[0],tspnt);
1716
(fr->dct36)(fsIn[1],rawout1+18,rawout2+18,win1[0],tspnt+1);
1717
#else
1718
dct36(fsIn[0],rawout1,rawout2,win[0],tspnt);
1719
dct36(fsIn[1],rawout1+18,rawout2+18,win1[0],tspnt+1);
1720
#endif
1721
rawout1 += 36; rawout2 += 36; tspnt += 2;
1722
}
1723
1724
bt = gr_info->block_type;
1725
if(bt == 2) {
1726
for (; sb<gr_info->maxb; sb+=2,tspnt+=2,rawout1+=36,rawout2+=36) {
1727
dct12(fsIn[sb] ,rawout1 ,rawout2 ,win[2] ,tspnt);
1728
dct12(fsIn[sb+1],rawout1+18,rawout2+18,win1[2],tspnt+1);
1729
}
1730
}
1731
else {
1732
for (; sb<gr_info->maxb; sb+=2,tspnt+=2,rawout1+=36,rawout2+=36) {
1733
#ifdef USE_3DNOW
1734
(fr->dct36)(fsIn[sb],rawout1,rawout2,win[bt],tspnt);
1735
(fr->dct36)(fsIn[sb+1],rawout1+18,rawout2+18,win1[bt],tspnt+1);
1736
#else
1737
dct36(fsIn[sb],rawout1,rawout2,win[bt],tspnt);
1738
dct36(fsIn[sb+1],rawout1+18,rawout2+18,win1[bt],tspnt+1);
1739
#endif
1740
}
1741
}
1742
1743
for(;sb<SBLIMIT;sb++,tspnt++) {
1744
int i;
1745
for(i=0;i<SSLIMIT;i++) {
1746
tspnt[i*SBLIMIT] = *rawout1++;
1747
*rawout2++ = DOUBLE_TO_REAL(0.0);
1748
}
1749
}
1750
}
1751
1752
1753
/*
1754
* main layer3 handler
1755
*/
1756
int do_layer3(struct frame *fr,int outmode,struct audio_info_struct *ai)
1757
{
1758
int gr, ch, ss,clip=0;
1759
int scalefacs[2][39]; /* max 39 for short[13][3] mode, mixed: 38, long: 22 */
1760
struct III_sideinfo sideinfo;
1761
int stereo = fr->stereo;
1762
int single = fr->single;
1763
int ms_stereo,i_stereo;
1764
int sfreq = fr->sampling_frequency;
1765
int stereo1,granules;
1766
1767
if(stereo == 1) { /* stream is mono */
1768
stereo1 = 1;
1769
single = 0;
1770
}
1771
else if(single >= 0) /* stream is stereo, but force to mono */
1772
stereo1 = 1;
1773
else
1774
stereo1 = 2;
1775
1776
if(fr->mode == MPG_MD_JOINT_STEREO) {
1777
ms_stereo = (fr->mode_ext & 0x2)>>1;
1778
i_stereo = fr->mode_ext & 0x1;
1779
}
1780
else
1781
ms_stereo = i_stereo = 0;
1782
1783
if(fr->lsf) {
1784
granules = 1;
1785
#if 0
1786
III_get_side_info_2(&sideinfo,stereo,ms_stereo,sfreq,single);
1787
#endif
1788
}
1789
else {
1790
granules = 2;
1791
}
1792
/* quick hack to keep the music playing */
1793
/* after having seen this nasty test file... */
1794
if(III_get_side_info(&sideinfo,stereo,ms_stereo,sfreq,single,fr->lsf))
1795
{
1796
error("bad frame - unable to get valid sideinfo");
1797
return clip;
1798
}
1799
1800
set_pointer(sideinfo.main_data_begin);
1801
1802
for (gr=0;gr<granules;gr++) {
1803
real hybridIn [2][SBLIMIT][SSLIMIT];
1804
real hybridOut[2][SSLIMIT][SBLIMIT];
1805
1806
{
1807
struct gr_info_s *gr_info = &(sideinfo.ch[0].gr[gr]);
1808
long part2bits;
1809
if(fr->lsf)
1810
part2bits = III_get_scale_factors_2(scalefacs[0],gr_info,0);
1811
else
1812
part2bits = III_get_scale_factors_1(scalefacs[0],gr_info,0,gr);
1813
1814
if(III_dequantize_sample(hybridIn[0], scalefacs[0],gr_info,sfreq,part2bits))
1815
return clip;
1816
}
1817
1818
if(stereo == 2) {
1819
struct gr_info_s *gr_info = &(sideinfo.ch[1].gr[gr]);
1820
long part2bits;
1821
if(fr->lsf)
1822
part2bits = III_get_scale_factors_2(scalefacs[1],gr_info,i_stereo);
1823
else
1824
part2bits = III_get_scale_factors_1(scalefacs[1],gr_info,1,gr);
1825
1826
if(III_dequantize_sample(hybridIn[1],scalefacs[1],gr_info,sfreq,part2bits))
1827
return clip;
1828
1829
if(ms_stereo) {
1830
int i;
1831
int maxb = sideinfo.ch[0].gr[gr].maxb;
1832
if(sideinfo.ch[1].gr[gr].maxb > maxb)
1833
maxb = sideinfo.ch[1].gr[gr].maxb;
1834
for(i=0;i<SSLIMIT*maxb;i++) {
1835
real tmp0 = ((real *)hybridIn[0])[i];
1836
real tmp1 = ((real *)hybridIn[1])[i];
1837
((real *)hybridIn[0])[i] = tmp0 + tmp1;
1838
((real *)hybridIn[1])[i] = tmp0 - tmp1;
1839
}
1840
}
1841
1842
if(i_stereo)
1843
III_i_stereo(hybridIn,scalefacs[1],gr_info,sfreq,ms_stereo,fr->lsf);
1844
1845
if(ms_stereo || i_stereo || (single == 3) ) {
1846
if(gr_info->maxb > sideinfo.ch[0].gr[gr].maxb)
1847
sideinfo.ch[0].gr[gr].maxb = gr_info->maxb;
1848
else
1849
gr_info->maxb = sideinfo.ch[0].gr[gr].maxb;
1850
}
1851
1852
switch(single) {
1853
case 3:
1854
{
1855
register int i;
1856
register real *in0 = (real *) hybridIn[0],*in1 = (real *) hybridIn[1];
1857
for(i=0;i<SSLIMIT*gr_info->maxb;i++,in0++)
1858
*in0 = (*in0 + *in1++); /* *0.5 done by pow-scale */
1859
}
1860
break;
1861
case 1:
1862
{
1863
register int i;
1864
register real *in0 = (real *) hybridIn[0],*in1 = (real *) hybridIn[1];
1865
for(i=0;i<SSLIMIT*gr_info->maxb;i++)
1866
*in0++ = *in1++;
1867
}
1868
break;
1869
}
1870
}
1871
1872
for(ch=0;ch<stereo1;ch++) {
1873
struct gr_info_s *gr_info = &(sideinfo.ch[ch].gr[gr]);
1874
III_antialias(hybridIn[ch],gr_info);
1875
#ifdef USE_3DNOW
1876
III_hybrid(hybridIn[ch], hybridOut[ch], ch,gr_info,fr);
1877
#else
1878
III_hybrid(hybridIn[ch], hybridOut[ch], ch,gr_info);
1879
#endif
1880
}
1881
1882
#ifdef I486_OPT
1883
if (fr->synth != synth_1to1 || single >= 0) {
1884
#endif
1885
for(ss=0;ss<SSLIMIT;ss++) {
1886
if(single >= 0) {
1887
clip += (fr->synth_mono)(hybridOut[0][ss],pcm_sample,&pcm_point);
1888
}
1889
else {
1890
int p1 = pcm_point;
1891
clip += (fr->synth)(hybridOut[0][ss],0,pcm_sample,&p1);
1892
clip += (fr->synth)(hybridOut[1][ss],1,pcm_sample,&pcm_point);
1893
}
1894
1895
#ifdef VARMODESUPPORT
1896
if (playlimit < 128) {
1897
pcm_point -= playlimit >> 1;
1898
playlimit = 0;
1899
}
1900
else
1901
playlimit -= 128;
1902
#endif
1903
if(pcm_point >= audiobufsize) audio_flush(outmode,ai);
1904
}
1905
#ifdef I486_OPT
1906
} else {
1907
/* Only stereo, 16 bits benefit from the 486 optimization. */
1908
ss=0;
1909
while (ss < SSLIMIT) {
1910
int n;
1911
n=(audiobufsize - pcm_point) / (2*2*32);
1912
if (n > (SSLIMIT-ss)) n=SSLIMIT-ss;
1913
1914
synth_1to1_486(hybridOut[0][ss],0,pcm_sample+pcm_point,n);
1915
synth_1to1_486(hybridOut[1][ss],1,pcm_sample+pcm_point,n);
1916
ss+=n;
1917
pcm_point+=(2*2*32)*n;
1918
1919
if(pcm_point >= audiobufsize) audio_flush(outmode,ai);
1920
}
1921
}
1922
#endif
1923
}
1924
1925
return clip;
1926
}
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Version: 2.0.1