aboutsummaryrefslogtreecommitdiffhomepage
path: root/tremor/res012.c
blob: 56e98f3c70bd39b0982a9440f2330c2998ecacbc (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
/********************************************************************
 *                                                                  *
 * THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE.   *
 *                                                                  *
 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
 *                                                                  *
 * THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002    *
 * BY THE Xiph.Org FOUNDATION http://www.xiph.org/                  *
 *                                                                  *
 ********************************************************************

 function: residue backend 0, 1 and 2 implementation

 ********************************************************************/

#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "ogg.h"
#include "ivorbiscodec.h"
#include "codec_internal.h"
#include "registry.h"
#include "codebook.h"
#include "misc.h"
#include "os.h"

typedef struct {
  vorbis_info_residue0 *info;
  int         map;
  
  int         parts;
  int         stages;
  codebook   *fullbooks;
  codebook   *phrasebook;
  codebook ***partbooks;

  int         partvals;
  int       **decodemap;

} vorbis_look_residue0;

void res0_free_info(vorbis_info_residue *i){
  vorbis_info_residue0 *info=(vorbis_info_residue0 *)i;
  if(info){
    memset(info,0,sizeof(*info));
    _ogg_free(info);
  }
}

void res0_free_look(vorbis_look_residue *i){
  int j;
  if(i){

    vorbis_look_residue0 *look=(vorbis_look_residue0 *)i;

    for(j=0;j<look->parts;j++)
      if(look->partbooks[j])_ogg_free(look->partbooks[j]);
    _ogg_free(look->partbooks);
    for(j=0;j<look->partvals;j++)
      _ogg_free(look->decodemap[j]);
    _ogg_free(look->decodemap);

    memset(look,0,sizeof(*look));
    _ogg_free(look);
  }
}

static int ilog(unsigned int v){
  int ret=0;
  while(v){
    ret++;
    v>>=1;
  }
  return(ret);
}

static int icount(unsigned int v){
  int ret=0;
  while(v){
    ret+=v&1;
    v>>=1;
  }
  return(ret);
}

/* vorbis_info is for range checking */
vorbis_info_residue *res0_unpack(vorbis_info *vi,oggpack_buffer *opb){
  int j,acc=0;
  vorbis_info_residue0 *info=(vorbis_info_residue0 *)_ogg_calloc(1,sizeof(*info));
  codec_setup_info     *ci=(codec_setup_info *)vi->codec_setup;

  info->begin=oggpack_read(opb,24);
  info->end=oggpack_read(opb,24);
  info->grouping=oggpack_read(opb,24)+1;
  info->partitions=oggpack_read(opb,6)+1;
  info->groupbook=oggpack_read(opb,8);

  for(j=0;j<info->partitions;j++){
    int cascade=oggpack_read(opb,3);
    if(oggpack_read(opb,1))
      cascade|=(oggpack_read(opb,5)<<3);
    info->secondstages[j]=cascade;

    acc+=icount(cascade);
  }
  for(j=0;j<acc;j++)
    info->booklist[j]=oggpack_read(opb,8);

  if(info->groupbook>=ci->books)goto errout;
  for(j=0;j<acc;j++)
    if(info->booklist[j]>=ci->books)goto errout;

  return(info);
 errout:
  res0_free_info(info);
  return(NULL);
}

vorbis_look_residue *res0_look(vorbis_dsp_state *vd,vorbis_info_mode *vm,
			  vorbis_info_residue *vr){
  vorbis_info_residue0 *info=(vorbis_info_residue0 *)vr;
  vorbis_look_residue0 *look=(vorbis_look_residue0 *)_ogg_calloc(1,sizeof(*look));
  codec_setup_info     *ci=(codec_setup_info *)vd->vi->codec_setup;

  int j,k,acc=0;
  int dim;
  int maxstage=0;
  look->info=info;
  look->map=vm->mapping;

  look->parts=info->partitions;
  look->fullbooks=ci->fullbooks;
  look->phrasebook=ci->fullbooks+info->groupbook;
  dim=look->phrasebook->dim;

  look->partbooks=(codebook ***)_ogg_calloc(look->parts,sizeof(*look->partbooks));

  for(j=0;j<look->parts;j++){
    int stages=ilog(info->secondstages[j]);
    if(stages){
      if(stages>maxstage)maxstage=stages;
      look->partbooks[j]=(codebook **)_ogg_calloc(stages,sizeof(*look->partbooks[j]));
      for(k=0;k<stages;k++)
	if(info->secondstages[j]&(1<<k)){
	  look->partbooks[j][k]=ci->fullbooks+info->booklist[acc++];
#ifdef TRAIN_RES
	  look->training_data[k][j]=calloc(look->partbooks[j][k]->entries,
					   sizeof(***look->training_data));
#endif
	}
    }
  }

  look->partvals=look->parts;
  for(j=1;j<dim;j++)look->partvals*=look->parts;
  look->stages=maxstage;
  look->decodemap=(int **)_ogg_malloc(look->partvals*sizeof(*look->decodemap));
  for(j=0;j<look->partvals;j++){
    long val=j;
    long mult=look->partvals/look->parts;
    look->decodemap[j]=(int *)_ogg_malloc(dim*sizeof(*look->decodemap[j]));
    for(k=0;k<dim;k++){
      long deco=val/mult;
      val-=deco*mult;
      mult/=look->parts;
      look->decodemap[j][k]=deco;
    }
  }

  return(look);
}


/* a truncated packet here just means 'stop working'; it's not an error */
static int _01inverse(vorbis_block *vb,vorbis_look_residue *vl,
		      ogg_int32_t **in,int ch,
		      long (*decodepart)(codebook *, ogg_int32_t *, 
					 oggpack_buffer *,int,int)){

  long i,j,k,l,s;
  vorbis_look_residue0 *look=(vorbis_look_residue0 *)vl;
  vorbis_info_residue0 *info=look->info;

  /* move all this setup out later */
  int samples_per_partition=info->grouping;
  int partitions_per_word=look->phrasebook->dim;
  int n=info->end-info->begin;
  
  int partvals=n/samples_per_partition;
  int partwords=(partvals+partitions_per_word-1)/partitions_per_word;
  int ***partword=(int ***)alloca(ch*sizeof(*partword));

  for(j=0;j<ch;j++)
    partword[j]=(int **)_vorbis_block_alloc(vb,partwords*sizeof(*partword[j]));

  for(s=0;s<look->stages;s++){

    /* each loop decodes on partition codeword containing 
       partitions_pre_word partitions */
    for(i=0,l=0;i<partvals;l++){
      if(s==0){
	/* fetch the partition word for each channel */
	for(j=0;j<ch;j++){
	  int temp=vorbis_book_decode(look->phrasebook,&vb->opb);
	  if(temp==-1)goto eopbreak;
	  partword[j][l]=look->decodemap[temp];
	  if(partword[j][l]==NULL)goto errout;
	}
      }
      
      /* now we decode residual values for the partitions */
      for(k=0;k<partitions_per_word && i<partvals;k++,i++)
	for(j=0;j<ch;j++){
	  long offset=info->begin+i*samples_per_partition;
	  if(info->secondstages[partword[j][l][k]]&(1<<s)){
	    codebook *stagebook=look->partbooks[partword[j][l][k]][s];
	    if(stagebook){
	      if(decodepart(stagebook,in[j]+offset,&vb->opb,
			    samples_per_partition,-8)==-1)goto eopbreak;
	    }
	  }
	}
    } 
  }
  
 errout:
 eopbreak:
  return(0);
}

int res0_inverse(vorbis_block *vb,vorbis_look_residue *vl,
		 ogg_int32_t **in,int *nonzero,int ch){
  int i,used=0;
  for(i=0;i<ch;i++)
    if(nonzero[i])
      in[used++]=in[i];
  if(used)
    return(_01inverse(vb,vl,in,used,vorbis_book_decodevs_add));
  else
    return(0);
}

int res1_inverse(vorbis_block *vb,vorbis_look_residue *vl,
		 ogg_int32_t **in,int *nonzero,int ch){
  int i,used=0;
  for(i=0;i<ch;i++)
    if(nonzero[i])
      in[used++]=in[i];
  if(used)
    return(_01inverse(vb,vl,in,used,vorbis_book_decodev_add));
  else
    return(0);
}

/* duplicate code here as speed is somewhat more important */
int res2_inverse(vorbis_block *vb,vorbis_look_residue *vl,
		 ogg_int32_t **in,int *nonzero,int ch){
  long i,k,l,s;
  vorbis_look_residue0 *look=(vorbis_look_residue0 *)vl;
  vorbis_info_residue0 *info=look->info;

  /* move all this setup out later */
  int samples_per_partition=info->grouping;
  int partitions_per_word=look->phrasebook->dim;
  int n=info->end-info->begin;

  int partvals=n/samples_per_partition;
  int partwords=(partvals+partitions_per_word-1)/partitions_per_word;
  int **partword=(int **)_vorbis_block_alloc(vb,partwords*sizeof(*partword));
  int beginoff=info->begin/ch;

  for(i=0;i<ch;i++)if(nonzero[i])break;
  if(i==ch)return(0); /* no nonzero vectors */

  samples_per_partition/=ch;

  for(s=0;s<look->stages;s++){
    for(i=0,l=0;i<partvals;l++){

      if(s==0){
	/* fetch the partition word */
	int temp=vorbis_book_decode(look->phrasebook,&vb->opb);
	if(temp==-1)goto eopbreak;
	partword[l]=look->decodemap[temp];
	if(partword[l]==NULL)goto errout;
      }

      /* now we decode residual values for the partitions */
      for(k=0;k<partitions_per_word && i<partvals;k++,i++)
	if(info->secondstages[partword[l][k]]&(1<<s)){
	  codebook *stagebook=look->partbooks[partword[l][k]][s];
	  
	  if(stagebook){
	    if(vorbis_book_decodevv_add(stagebook,in,
					i*samples_per_partition+beginoff,ch,
					&vb->opb,
					samples_per_partition,-8)==-1)
	      goto eopbreak;
	  }
	}
    } 
  }
  
 errout:
 eopbreak:
  return(0);
}


vorbis_func_residue residue0_exportbundle={
  &res0_unpack,
  &res0_look,
  &res0_free_info,
  &res0_free_look,
  &res0_inverse
};

vorbis_func_residue residue1_exportbundle={
  &res0_unpack,
  &res0_look,
  &res0_free_info,
  &res0_free_look,
  &res1_inverse
};

vorbis_func_residue residue2_exportbundle={
  &res0_unpack,
  &res0_look,
  &res0_free_info,
  &res0_free_look,
  &res2_inverse
};