summaryrefslogtreecommitdiffstats
path: root/tremor/mapping0.c
blob: bcf46ea8ac0196f84609cc06f9069ddd731e6ea7 (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
/********************************************************************
 *                                                                  *
 * 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: channel mapping 0 implementation

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

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

/* simplistic, wasteful way of doing this (unique lookup for each
   mode/submapping); there should be a central repository for
   identical lookups.  That will require minor work, so I'm putting it
   off as low priority.

   Why a lookup for each backend in a given mode?  Because the
   blocksize is set by the mode, and low backend lookups may require
   parameters from other areas of the mode/mapping */

typedef struct {
  vorbis_info_mode *mode;
  vorbis_info_mapping0 *map;

  vorbis_look_floor **floor_look;

  vorbis_look_residue **residue_look;

  vorbis_func_floor **floor_func;
  vorbis_func_residue **residue_func;

  int ch;
  long lastframe; /* if a different mode is called, we need to 
		     invalidate decay */
} vorbis_look_mapping0;

static void mapping0_free_info(vorbis_info_mapping *i){
  vorbis_info_mapping0 *info=(vorbis_info_mapping0 *)i;
  if(info){
    memset(info,0,sizeof(*info));
    _ogg_free(info);
  }
}

static void mapping0_free_look(vorbis_look_mapping *look){
  int i;
  vorbis_look_mapping0 *l=(vorbis_look_mapping0 *)look;
  if(l){

    for(i=0;i<l->map->submaps;i++){
      l->floor_func[i]->free_look(l->floor_look[i]);
      l->residue_func[i]->free_look(l->residue_look[i]);
    }

    _ogg_free(l->floor_func);
    _ogg_free(l->residue_func);
    _ogg_free(l->floor_look);
    _ogg_free(l->residue_look);
    memset(l,0,sizeof(*l));
    _ogg_free(l);
  }
}

static vorbis_look_mapping *mapping0_look(vorbis_dsp_state *vd,vorbis_info_mode *vm,
			  vorbis_info_mapping *m){
  int i;
  vorbis_info          *vi=vd->vi;
  codec_setup_info     *ci=(codec_setup_info *)vi->codec_setup;
  vorbis_look_mapping0 *look=(vorbis_look_mapping0 *)_ogg_calloc(1,sizeof(*look));
  vorbis_info_mapping0 *info=look->map=(vorbis_info_mapping0 *)m;
  look->mode=vm;
  
  look->floor_look=(vorbis_look_floor **)_ogg_calloc(info->submaps,sizeof(*look->floor_look));

  look->residue_look=(vorbis_look_residue **)_ogg_calloc(info->submaps,sizeof(*look->residue_look));

  look->floor_func=(vorbis_func_floor **)_ogg_calloc(info->submaps,sizeof(*look->floor_func));
  look->residue_func=(vorbis_func_residue **)_ogg_calloc(info->submaps,sizeof(*look->residue_func));
  
  for(i=0;i<info->submaps;i++){
    int floornum=info->floorsubmap[i];
    int resnum=info->residuesubmap[i];

    look->floor_func[i]=_floor_P[ci->floor_type[floornum]];
    look->floor_look[i]=look->floor_func[i]->
      look(vd,vm,ci->floor_param[floornum]);
    look->residue_func[i]=_residue_P[ci->residue_type[resnum]];
    look->residue_look[i]=look->residue_func[i]->
      look(vd,vm,ci->residue_param[resnum]);
    
  }

  look->ch=vi->channels;

  return(look);
}

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

/* also responsible for range checking */
static vorbis_info_mapping *mapping0_unpack(vorbis_info *vi,oggpack_buffer *opb){
  int i;
  vorbis_info_mapping0 *info=(vorbis_info_mapping0 *)_ogg_calloc(1,sizeof(*info));
  codec_setup_info     *ci=(codec_setup_info *)vi->codec_setup;
  memset(info,0,sizeof(*info));

  if(oggpack_read(opb,1))
    info->submaps=oggpack_read(opb,4)+1;
  else
    info->submaps=1;

  if(oggpack_read(opb,1)){
    info->coupling_steps=oggpack_read(opb,8)+1;

    for(i=0;i<info->coupling_steps;i++){
      int testM=info->coupling_mag[i]=oggpack_read(opb,ilog(vi->channels));
      int testA=info->coupling_ang[i]=oggpack_read(opb,ilog(vi->channels));

      if(testM<0 || 
	 testA<0 || 
	 testM==testA || 
	 testM>=vi->channels ||
	 testA>=vi->channels) goto err_out;
    }

  }

  if(oggpack_read(opb,2)>0)goto err_out; /* 2,3:reserved */
    
  if(info->submaps>1){
    for(i=0;i<vi->channels;i++){
      info->chmuxlist[i]=oggpack_read(opb,4);
      if(info->chmuxlist[i]>=info->submaps)goto err_out;
    }
  }
  for(i=0;i<info->submaps;i++){
    int temp=oggpack_read(opb,8);
    if(temp>=ci->times)goto err_out;
    info->floorsubmap[i]=oggpack_read(opb,8);
    if(info->floorsubmap[i]>=ci->floors)goto err_out;
    info->residuesubmap[i]=oggpack_read(opb,8);
    if(info->residuesubmap[i]>=ci->residues)goto err_out;
  }

  return info;

 err_out:
  mapping0_free_info(info);
  return(NULL);
}

static int seq=0;
static int mapping0_inverse(vorbis_block *vb,vorbis_look_mapping *l){
  vorbis_dsp_state     *vd=vb->vd;
  vorbis_info          *vi=vd->vi;
  codec_setup_info     *ci=(codec_setup_info *)vi->codec_setup;
  backend_lookup_state *b=(backend_lookup_state *)vd->backend_state;
  vorbis_look_mapping0 *look=(vorbis_look_mapping0 *)l;
  vorbis_info_mapping0 *info=look->map;

  int                   i,j;
  long                  n=vb->pcmend=ci->blocksizes[vb->W];

  ogg_int32_t **pcmbundle=(ogg_int32_t **)alloca(sizeof(*pcmbundle)*vi->channels);
  int    *zerobundle=(int *)alloca(sizeof(*zerobundle)*vi->channels);
  
  int   *nonzero  =(int *)alloca(sizeof(*nonzero)*vi->channels);
  void **floormemo=(void **)alloca(sizeof(*floormemo)*vi->channels);
  
  /* time domain information decode (note that applying the
     information would have to happen later; we'll probably add a
     function entry to the harness for that later */
  /* NOT IMPLEMENTED */

  /* recover the spectral envelope; store it in the PCM vector for now */
  for(i=0;i<vi->channels;i++){
    int submap=info->chmuxlist[i];
    floormemo[i]=look->floor_func[submap]->
      inverse1(vb,look->floor_look[submap]);
    if(floormemo[i])
      nonzero[i]=1;
    else
      nonzero[i]=0;      
    memset(vb->pcm[i],0,sizeof(*vb->pcm[i])*n/2);
  }

  /* channel coupling can 'dirty' the nonzero listing */
  for(i=0;i<info->coupling_steps;i++){
    if(nonzero[info->coupling_mag[i]] ||
       nonzero[info->coupling_ang[i]]){
      nonzero[info->coupling_mag[i]]=1; 
      nonzero[info->coupling_ang[i]]=1; 
    }
  }

  /* recover the residue into our working vectors */
  for(i=0;i<info->submaps;i++){
    int ch_in_bundle=0;
    for(j=0;j<vi->channels;j++){
      if(info->chmuxlist[j]==i){
	if(nonzero[j])
	  zerobundle[ch_in_bundle]=1;
	else
	  zerobundle[ch_in_bundle]=0;
	pcmbundle[ch_in_bundle++]=vb->pcm[j];
      }
    }
    
    look->residue_func[i]->inverse(vb,look->residue_look[i],
				   pcmbundle,zerobundle,ch_in_bundle);
  }

  //for(j=0;j<vi->channels;j++)
  //_analysis_output("coupled",seq+j,vb->pcm[j],-8,n/2,0,0);


  /* channel coupling */
  for(i=info->coupling_steps-1;i>=0;i--){
    ogg_int32_t *pcmM=vb->pcm[info->coupling_mag[i]];
    ogg_int32_t *pcmA=vb->pcm[info->coupling_ang[i]];
    
    for(j=0;j<n/2;j++){
      ogg_int32_t mag=pcmM[j];
      ogg_int32_t ang=pcmA[j];
      
      if(mag>0)
	if(ang>0){
	  pcmM[j]=mag;
	  pcmA[j]=mag-ang;
	}else{
	  pcmA[j]=mag;
	  pcmM[j]=mag+ang;
	}
      else
	if(ang>0){
	  pcmM[j]=mag;
	  pcmA[j]=mag+ang;
	}else{
	  pcmA[j]=mag;
	  pcmM[j]=mag-ang;
	}
    }
  }

  //for(j=0;j<vi->channels;j++)
  //_analysis_output("residue",seq+j,vb->pcm[j],-8,n/2,0,0);

  /* compute and apply spectral envelope */
  for(i=0;i<vi->channels;i++){
    ogg_int32_t *pcm=vb->pcm[i];
    int submap=info->chmuxlist[i];
    look->floor_func[submap]->
      inverse2(vb,look->floor_look[submap],floormemo[i],pcm);
  }

  //for(j=0;j<vi->channels;j++)
  //_analysis_output("mdct",seq+j,vb->pcm[j],-24,n/2,0,1);

  /* transform the PCM data; takes PCM vector, vb; modifies PCM vector */
  /* only MDCT right now.... */
  for(i=0;i<vi->channels;i++){
    ogg_int32_t *pcm=vb->pcm[i];
    mdct_backward(n,pcm,pcm);
  }

  //for(j=0;j<vi->channels;j++)
  //_analysis_output("imdct",seq+j,vb->pcm[j],-24,n,0,0);

  /* window the data */
  for(i=0;i<vi->channels;i++){
    ogg_int32_t *pcm=vb->pcm[i];
    if(nonzero[i])
      _vorbis_apply_window(pcm,b->window,ci->blocksizes,vb->lW,vb->W,vb->nW);
    else
      for(j=0;j<n;j++)
	pcm[j]=0;
    
  }

  //for(j=0;j<vi->channels;j++)
  //_analysis_output("window",seq+j,vb->pcm[j],-24,n,0,0);

  seq+=vi->channels;
  /* all done! */
  return(0);
}

/* export hooks */
vorbis_func_mapping mapping0_exportbundle={
  &mapping0_unpack,
  &mapping0_look,
  &mapping0_free_info,
  &mapping0_free_look,
  &mapping0_inverse
};