aboutsummaryrefslogtreecommitdiffstats
path: root/code/libspeex/cb_search.c
blob: 63f4c6a4bd49d0cd0659b202a84151c88fed596f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
/* Copyright (C) 2002-2006 Jean-Marc Valin 
   File: cb_search.c

   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions
   are met:
   
   - Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
   
   - Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.
   
   - Neither the name of the Xiph.org Foundation nor the names of its
   contributors may be used to endorse or promote products derived from
   this software without specific prior written permission.
   
   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
   CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "cb_search.h"
#include "filters.h"
#include "stack_alloc.h"
#include "vq.h"
#include "arch.h"
#include "math_approx.h"
#include "os_support.h"

#ifdef _USE_SSE
#include "cb_search_sse.h"
#elif defined(ARM4_ASM) || defined(ARM5E_ASM)
#include "cb_search_arm4.h"
#elif defined(BFIN_ASM)
#include "cb_search_bfin.h"
#endif

#ifndef OVERRIDE_COMPUTE_WEIGHTED_CODEBOOK
static void compute_weighted_codebook(const signed char *shape_cb, const spx_word16_t *r, spx_word16_t *resp, spx_word16_t *resp2, spx_word32_t *E, int shape_cb_size, int subvect_size, char *stack)
{
   int i, j, k;
   VARDECL(spx_word16_t *shape);
   ALLOC(shape, subvect_size, spx_word16_t);
   for (i=0;i<shape_cb_size;i++)
   {
      spx_word16_t *res;
      
      res = resp+i*subvect_size;
      for (k=0;k<subvect_size;k++)
         shape[k] = (spx_word16_t)shape_cb[i*subvect_size+k];
      E[i]=0;

      /* Compute codeword response using convolution with impulse response */
      for(j=0;j<subvect_size;j++)
      {
         spx_word32_t resj=0;
         spx_word16_t res16;
         for (k=0;k<=j;k++)
            resj = MAC16_16(resj,shape[k],r[j-k]);
#ifdef FIXED_POINT
         res16 = EXTRACT16(SHR32(resj, 13));
#else
         res16 = 0.03125f*resj;
#endif
         /* Compute codeword energy */
         E[i]=MAC16_16(E[i],res16,res16);
         res[j] = res16;
         /*printf ("%d\n", (int)res[j]);*/
      }
   }

}
#endif

#ifndef OVERRIDE_TARGET_UPDATE
static inline void target_update(spx_word16_t *t, spx_word16_t g, spx_word16_t *r, int len)
{
   int n;
   for (n=0;n<len;n++)
      t[n] = SUB16(t[n],PSHR32(MULT16_16(g,r[n]),13));
}
#endif



static void split_cb_search_shape_sign_N1(
spx_word16_t target[],			/* target vector */
spx_coef_t ak[],			/* LPCs for this subframe */
spx_coef_t awk1[],			/* Weighted LPCs for this subframe */
spx_coef_t awk2[],			/* Weighted LPCs for this subframe */
const void *par,                      /* Codebook/search parameters*/
int   p,                        /* number of LPC coeffs */
int   nsf,                      /* number of samples in subframe */
spx_sig_t *exc,
spx_word16_t *r,
SpeexBits *bits,
char *stack,
int   update_target
)
{
   int i,j,m,q;
   VARDECL(spx_word16_t *resp);
#ifdef _USE_SSE
   VARDECL(__m128 *resp2);
   VARDECL(__m128 *E);
#else
   spx_word16_t *resp2;
   VARDECL(spx_word32_t *E);
#endif
   VARDECL(spx_word16_t *t);
   VARDECL(spx_sig_t *e);
   const signed char *shape_cb;
   int shape_cb_size, subvect_size, nb_subvect;
   const split_cb_params *params;
   int best_index;
   spx_word32_t best_dist;
   int have_sign;
   
   params = (const split_cb_params *) par;
   subvect_size = params->subvect_size;
   nb_subvect = params->nb_subvect;
   shape_cb_size = 1<<params->shape_bits;
   shape_cb = params->shape_cb;
   have_sign = params->have_sign;
   ALLOC(resp, shape_cb_size*subvect_size, spx_word16_t);
#ifdef _USE_SSE
   ALLOC(resp2, (shape_cb_size*subvect_size)>>2, __m128);
   ALLOC(E, shape_cb_size>>2, __m128);
#else
   resp2 = resp;
   ALLOC(E, shape_cb_size, spx_word32_t);
#endif
   ALLOC(t, nsf, spx_word16_t);
   ALLOC(e, nsf, spx_sig_t);
   
   /* FIXME: Do we still need to copy the target? */
   SPEEX_COPY(t, target, nsf);

   compute_weighted_codebook(shape_cb, r, resp, resp2, E, shape_cb_size, subvect_size, stack);

   for (i=0;i<nb_subvect;i++)
   {
      spx_word16_t *x=t+subvect_size*i;
      /*Find new n-best based on previous n-best j*/
      if (have_sign)
         vq_nbest_sign(x, resp2, subvect_size, shape_cb_size, E, 1, &best_index, &best_dist, stack);
      else
         vq_nbest(x, resp2, subvect_size, shape_cb_size, E, 1, &best_index, &best_dist, stack);
      
      speex_bits_pack(bits,best_index,params->shape_bits+have_sign);
      
      {
         int rind;
         spx_word16_t *res;
         spx_word16_t sign=1;
         rind = best_index;
         if (rind>=shape_cb_size)
         {
            sign=-1;
            rind-=shape_cb_size;
         }
         res = resp+rind*subvect_size;
         if (sign>0)
            for (m=0;m<subvect_size;m++)
               t[subvect_size*i+m] = SUB16(t[subvect_size*i+m], res[m]);
         else
            for (m=0;m<subvect_size;m++)
               t[subvect_size*i+m] = ADD16(t[subvect_size*i+m], res[m]);

#ifdef FIXED_POINT
         if (sign==1)
         {
            for (j=0;j<subvect_size;j++)
               e[subvect_size*i+j]=SHL32(EXTEND32(shape_cb[rind*subvect_size+j]),SIG_SHIFT-5);
         } else {
            for (j=0;j<subvect_size;j++)
               e[subvect_size*i+j]=NEG32(SHL32(EXTEND32(shape_cb[rind*subvect_size+j]),SIG_SHIFT-5));
         }
#else
         for (j=0;j<subvect_size;j++)
            e[subvect_size*i+j]=sign*0.03125*shape_cb[rind*subvect_size+j];
#endif
      
      }
            
      for (m=0;m<subvect_size;m++)
      {
         spx_word16_t g;
         int rind;
         spx_word16_t sign=1;
         rind = best_index;
         if (rind>=shape_cb_size)
         {
            sign=-1;
            rind-=shape_cb_size;
         }
         
         q=subvect_size-m;
#ifdef FIXED_POINT
         g=sign*shape_cb[rind*subvect_size+m];
#else
         g=sign*0.03125*shape_cb[rind*subvect_size+m];
#endif
         target_update(t+subvect_size*(i+1), g, r+q, nsf-subvect_size*(i+1));
      }
   }

   /* Update excitation */
   /* FIXME: We could update the excitation directly above */
   for (j=0;j<nsf;j++)
      exc[j]=ADD32(exc[j],e[j]);
   
   /* Update target: only update target if necessary */
   if (update_target)
   {
      VARDECL(spx_word16_t *r2);
      ALLOC(r2, nsf, spx_word16_t);
      for (j=0;j<nsf;j++)
         r2[j] = EXTRACT16(PSHR32(e[j] ,6));
      syn_percep_zero16(r2, ak, awk1, awk2, r2, nsf,p, stack);
      for (j=0;j<nsf;j++)
         target[j]=SUB16(target[j],PSHR16(r2[j],2));
   }
}



void split_cb_search_shape_sign(
spx_word16_t target[],			/* target vector */
spx_coef_t ak[],			/* LPCs for this subframe */
spx_coef_t awk1[],			/* Weighted LPCs for this subframe */
spx_coef_t awk2[],			/* Weighted LPCs for this subframe */
const void *par,                      /* Codebook/search parameters*/
int   p,                        /* number of LPC coeffs */
int   nsf,                      /* number of samples in subframe */
spx_sig_t *exc,
spx_word16_t *r,
SpeexBits *bits,
char *stack,
int   complexity,
int   update_target
)
{
   int i,j,k,m,n,q;
   VARDECL(spx_word16_t *resp);
#ifdef _USE_SSE
   VARDECL(__m128 *resp2);
   VARDECL(__m128 *E);
#else
   spx_word16_t *resp2;
   VARDECL(spx_word32_t *E);
#endif
   VARDECL(spx_word16_t *t);
   VARDECL(spx_sig_t *e);
   VARDECL(spx_word16_t *tmp);
   VARDECL(spx_word32_t *ndist);
   VARDECL(spx_word32_t *odist);
   VARDECL(int *itmp);
   VARDECL(spx_word16_t **ot2);
   VARDECL(spx_word16_t **nt2);
   spx_word16_t **ot, **nt;
   VARDECL(int **nind);
   VARDECL(int **oind);
   VARDECL(int *ind);
   const signed char *shape_cb;
   int shape_cb_size, subvect_size, nb_subvect;
   const split_cb_params *params;
   int N=2;
   VARDECL(int *best_index);
   VARDECL(spx_word32_t *best_dist);
   VARDECL(int *best_nind);
   VARDECL(int *best_ntarget);
   int have_sign;
   N=complexity;
   if (N>10)
      N=10;
   /* Complexity isn't as important for the codebooks as it is for the pitch */
   N=(2*N)/3;
   if (N<1)
      N=1;
   if (N==1)
   {
      split_cb_search_shape_sign_N1(target,ak,awk1,awk2,par,p,nsf,exc,r,bits,stack,update_target);
      return;
   }
   ALLOC(ot2, N, spx_word16_t*);
   ALLOC(nt2, N, spx_word16_t*);
   ALLOC(oind, N, int*);
   ALLOC(nind, N, int*);

   params = (const split_cb_params *) par;
   subvect_size = params->subvect_size;
   nb_subvect = params->nb_subvect;
   shape_cb_size = 1<<params->shape_bits;
   shape_cb = params->shape_cb;
   have_sign = params->have_sign;
   ALLOC(resp, shape_cb_size*subvect_size, spx_word16_t);
#ifdef _USE_SSE
   ALLOC(resp2, (shape_cb_size*subvect_size)>>2, __m128);
   ALLOC(E, shape_cb_size>>2, __m128);
#else
   resp2 = resp;
   ALLOC(E, shape_cb_size, spx_word32_t);
#endif
   ALLOC(t, nsf, spx_word16_t);
   ALLOC(e, nsf, spx_sig_t);
   ALLOC(ind, nb_subvect, int);

   ALLOC(tmp, 2*N*nsf, spx_word16_t);
   for (i=0;i<N;i++)
   {
      ot2[i]=tmp+2*i*nsf;
      nt2[i]=tmp+(2*i+1)*nsf;
   }
   ot=ot2;
   nt=nt2;
   ALLOC(best_index, N, int);
   ALLOC(best_dist, N, spx_word32_t);
   ALLOC(best_nind, N, int);
   ALLOC(best_ntarget, N, int);
   ALLOC(ndist, N, spx_word32_t);
   ALLOC(odist, N, spx_word32_t);
   
   ALLOC(itmp, 2*N*nb_subvect, int);
   for (i=0;i<N;i++)
   {
      nind[i]=itmp+2*i*nb_subvect;
      oind[i]=itmp+(2*i+1)*nb_subvect;
   }
   
   SPEEX_COPY(t, target, nsf);

   for (j=0;j<N;j++)
      SPEEX_COPY(&ot[j][0], t, nsf);

   /* Pre-compute codewords response and energy */
   compute_weighted_codebook(shape_cb, r, resp, resp2, E, shape_cb_size, subvect_size, stack);

   for (j=0;j<N;j++)
      odist[j]=0;
   
   /*For all subvectors*/
   for (i=0;i<nb_subvect;i++)
   {
      /*"erase" nbest list*/
      for (j=0;j<N;j++)
         ndist[j]=VERY_LARGE32;
      /* This is not strictly necessary, but it provides an additonal safety 
         to prevent crashes in case something goes wrong in the previous
         steps (e.g. NaNs) */
      for (j=0;j<N;j++)
         best_nind[j] = best_ntarget[j] = 0;
      /*For all n-bests of previous subvector*/
      for (j=0;j<N;j++)
      {
         spx_word16_t *x=ot[j]+subvect_size*i;
         spx_word32_t tener = 0;
         for (m=0;m<subvect_size;m++)
            tener = MAC16_16(tener, x[m],x[m]);
#ifdef FIXED_POINT
         tener = SHR32(tener,1);
#else
         tener *= .5;
#endif
         /*Find new n-best based on previous n-best j*/
         if (have_sign)
            vq_nbest_sign(x, resp2, subvect_size, shape_cb_size, E, N, best_index, best_dist, stack);
         else
            vq_nbest(x, resp2, subvect_size, shape_cb_size, E, N, best_index, best_dist, stack);

         /*For all new n-bests*/
         for (k=0;k<N;k++)
         {
            /* Compute total distance (including previous sub-vectors */
            spx_word32_t err = ADD32(ADD32(odist[j],best_dist[k]),tener);
            
            /*update n-best list*/
            if (err<ndist[N-1])
            {
               for (m=0;m<N;m++)
               {
                  if (err < ndist[m])
                  {
                     for (n=N-1;n>m;n--)
                     {
                        ndist[n] = ndist[n-1];
                        best_nind[n] = best_nind[n-1];
                        best_ntarget[n] = best_ntarget[n-1];
                     }
                     /* n is equal to m here, so they're interchangeable */
                     ndist[m] = err;
                     best_nind[n] = best_index[k];
                     best_ntarget[n] = j;
                     break;
                  }
               }
            }
         }
         if (i==0)
            break;
      }
      for (j=0;j<N;j++)
      {
         /*previous target (we don't care what happened before*/
         for (m=(i+1)*subvect_size;m<nsf;m++)
            nt[j][m]=ot[best_ntarget[j]][m];
         
         /* New code: update the rest of the target only if it's worth it */
         for (m=0;m<subvect_size;m++)
         {
            spx_word16_t g;
            int rind;
            spx_word16_t sign=1;
            rind = best_nind[j];
            if (rind>=shape_cb_size)
            {
               sign=-1;
               rind-=shape_cb_size;
            }

            q=subvect_size-m;
#ifdef FIXED_POINT
            g=sign*shape_cb[rind*subvect_size+m];
#else
            g=sign*0.03125*shape_cb[rind*subvect_size+m];
#endif
            target_update(nt[j]+subvect_size*(i+1), g, r+q, nsf-subvect_size*(i+1));
         }

         for (q=0;q<nb_subvect;q++)
            nind[j][q]=oind[best_ntarget[j]][q];
         nind[j][i]=best_nind[j];
      }

      /*update old-new data*/
      /* just swap pointers instead of a long copy */
      {
         spx_word16_t **tmp2;
         tmp2=ot;
         ot=nt;
         nt=tmp2;
      }
      for (j=0;j<N;j++)
         for (m=0;m<nb_subvect;m++)
            oind[j][m]=nind[j][m];
      for (j=0;j<N;j++)
         odist[j]=ndist[j];
   }

   /*save indices*/
   for (i=0;i<nb_subvect;i++)
   {
      ind[i]=nind[0][i];
      speex_bits_pack(bits,ind[i],params->shape_bits+have_sign);
   }
   
   /* Put everything back together */
   for (i=0;i<nb_subvect;i++)
   {
      int rind;
      spx_word16_t sign=1;
      rind = ind[i];
      if (rind>=shape_cb_size)
      {
         sign=-1;
         rind-=shape_cb_size;
      }
#ifdef FIXED_POINT
      if (sign==1)
      {
         for (j=0;j<subvect_size;j++)
            e[subvect_size*i+j]=SHL32(EXTEND32(shape_cb[rind*subvect_size+j]),SIG_SHIFT-5);
      } else {
         for (j=0;j<subvect_size;j++)
            e[subvect_size*i+j]=NEG32(SHL32(EXTEND32(shape_cb[rind*subvect_size+j]),SIG_SHIFT-5));
      }
#else
      for (j=0;j<subvect_size;j++)
         e[subvect_size*i+j]=sign*0.03125*shape_cb[rind*subvect_size+j];
#endif
   }   
   /* Update excitation */
   for (j=0;j<nsf;j++)
      exc[j]=ADD32(exc[j],e[j]);
   
   /* Update target: only update target if necessary */
   if (update_target)
   {
      VARDECL(spx_word16_t *r2);
      ALLOC(r2, nsf, spx_word16_t);
      for (j=0;j<nsf;j++)
         r2[j] = EXTRACT16(PSHR32(e[j] ,6));
      syn_percep_zero16(r2, ak, awk1, awk2, r2, nsf,p, stack);
      for (j=0;j<nsf;j++)
         target[j]=SUB16(target[j],PSHR16(r2[j],2));
   }
}


void split_cb_shape_sign_unquant(
spx_sig_t *exc,
const void *par,                      /* non-overlapping codebook */
int   nsf,                      /* number of samples in subframe */
SpeexBits *bits,
char *stack,
spx_int32_t *seed
)
{
   int i,j;
   VARDECL(int *ind);
   VARDECL(int *signs);
   const signed char *shape_cb;
   int shape_cb_size, subvect_size, nb_subvect;
   const split_cb_params *params;
   int have_sign;

   params = (const split_cb_params *) par;
   subvect_size = params->subvect_size;
   nb_subvect = params->nb_subvect;
   shape_cb_size = 1<<params->shape_bits;
   shape_cb = params->shape_cb;
   have_sign = params->have_sign;

   ALLOC(ind, nb_subvect, int);
   ALLOC(signs, nb_subvect, int);

   /* Decode codewords and gains */
   for (i=0;i<nb_subvect;i++)
   {
      if (have_sign)
         signs[i] = speex_bits_unpack_unsigned(bits, 1);
      else
         signs[i] = 0;
      ind[i] = speex_bits_unpack_unsigned(bits, params->shape_bits);
   }
   /* Compute decoded excitation */
   for (i=0;i<nb_subvect;i++)
   {
      spx_word16_t s=1;
      if (signs[i])
         s=-1;
#ifdef FIXED_POINT
      if (s==1)
      {
         for (j=0;j<subvect_size;j++)
            exc[subvect_size*i+j]=SHL32(EXTEND32(shape_cb[ind[i]*subvect_size+j]),SIG_SHIFT-5);
      } else {
         for (j=0;j<subvect_size;j++)
            exc[subvect_size*i+j]=NEG32(SHL32(EXTEND32(shape_cb[ind[i]*subvect_size+j]),SIG_SHIFT-5));
      }
#else
      for (j=0;j<subvect_size;j++)
         exc[subvect_size*i+j]+=s*0.03125*shape_cb[ind[i]*subvect_size+j];      
#endif
   }
}

void noise_codebook_quant(
spx_word16_t target[],			/* target vector */
spx_coef_t ak[],			/* LPCs for this subframe */
spx_coef_t awk1[],			/* Weighted LPCs for this subframe */
spx_coef_t awk2[],			/* Weighted LPCs for this subframe */
const void *par,                      /* Codebook/search parameters*/
int   p,                        /* number of LPC coeffs */
int   nsf,                      /* number of samples in subframe */
spx_sig_t *exc,
spx_word16_t *r,
SpeexBits *bits,
char *stack,
int   complexity,
int   update_target
)
{
   int i;
   VARDECL(spx_word16_t *tmp);
   ALLOC(tmp, nsf, spx_word16_t);
   residue_percep_zero16(target, ak, awk1, awk2, tmp, nsf, p, stack);

   for (i=0;i<nsf;i++)
      exc[i]+=SHL32(EXTEND32(tmp[i]),8);
   SPEEX_MEMSET(target, 0, nsf);
}


void noise_codebook_unquant(
spx_sig_t *exc,
const void *par,                      /* non-overlapping codebook */
int   nsf,                      /* number of samples in subframe */
SpeexBits *bits,
char *stack,
spx_int32_t *seed
)
{
   int i;
   /* FIXME: This is bad, but I don't think the function ever gets called anyway */
   for (i=0;i<nsf;i++)
      exc[i]=SHL32(EXTEND32(speex_rand(1, seed)),SIG_SHIFT);
}