media/libtremor/lib/tremor_mapping0.c@6474c204b198
media/libtremor/lib/tremor_mapping0.c
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
1 /********************************************************************
2 * *
3 * THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE. *
4 * *
5 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
6 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
7 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
8 * *
9 * THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002 *
10 * BY THE Xiph.Org FOUNDATION http://www.xiph.org/ *
11 * *
12 ********************************************************************
14 function: channel mapping 0 implementation
16 ********************************************************************/
18 #include <stdlib.h>
19 #include <stdio.h>
20 #include <string.h>
21 #include <math.h>
22 #include <ogg/ogg.h>
23 #include "ivorbiscodec.h"
24 #include "mdct.h"
25 #include "codec_internal.h"
26 #include "codebook.h"
27 #include "window.h"
28 #include "registry.h"
29 #include "misc.h"
31 /* simplistic, wasteful way of doing this (unique lookup for each
32 mode/submapping); there should be a central repository for
33 identical lookups. That will require minor work, so I'm putting it
34 off as low priority.
36 Why a lookup for each backend in a given mode? Because the
37 blocksize is set by the mode, and low backend lookups may require
38 parameters from other areas of the mode/mapping */
40 typedef struct {
41 vorbis_info_mode *mode;
42 vorbis_info_mapping0 *map;
44 vorbis_look_floor **floor_look;
46 vorbis_look_residue **residue_look;
48 vorbis_func_floor **floor_func;
49 vorbis_func_residue **residue_func;
51 int ch;
52 long lastframe; /* if a different mode is called, we need to
53 invalidate decay */
54 } vorbis_look_mapping0;
56 static void mapping0_free_info(vorbis_info_mapping *i){
57 vorbis_info_mapping0 *info=(vorbis_info_mapping0 *)i;
58 if(info){
59 memset(info,0,sizeof(*info));
60 _ogg_free(info);
61 }
62 }
64 static void mapping0_free_look(vorbis_look_mapping *look){
65 int i;
66 vorbis_look_mapping0 *l=(vorbis_look_mapping0 *)look;
67 if(l){
69 for(i=0;i<l->map->submaps;i++){
70 l->floor_func[i]->free_look(l->floor_look[i]);
71 l->residue_func[i]->free_look(l->residue_look[i]);
72 }
74 _ogg_free(l->floor_func);
75 _ogg_free(l->residue_func);
76 _ogg_free(l->floor_look);
77 _ogg_free(l->residue_look);
78 memset(l,0,sizeof(*l));
79 _ogg_free(l);
80 }
81 }
83 static vorbis_look_mapping *mapping0_look(vorbis_dsp_state *vd,vorbis_info_mode *vm,
84 vorbis_info_mapping *m){
85 int i;
86 vorbis_info *vi=vd->vi;
87 codec_setup_info *ci=(codec_setup_info *)vi->codec_setup;
88 vorbis_look_mapping0 *look=(vorbis_look_mapping0 *)_ogg_calloc(1,sizeof(*look));
89 vorbis_info_mapping0 *info=look->map=(vorbis_info_mapping0 *)m;
90 look->mode=vm;
92 look->floor_look=(vorbis_look_floor **)_ogg_calloc(info->submaps,sizeof(*look->floor_look));
94 look->residue_look=(vorbis_look_residue **)_ogg_calloc(info->submaps,sizeof(*look->residue_look));
96 look->floor_func=(vorbis_func_floor **)_ogg_calloc(info->submaps,sizeof(*look->floor_func));
97 look->residue_func=(vorbis_func_residue **)_ogg_calloc(info->submaps,sizeof(*look->residue_func));
99 for(i=0;i<info->submaps;i++){
100 int floornum=info->floorsubmap[i];
101 int resnum=info->residuesubmap[i];
103 look->floor_func[i]=_floor_P[ci->floor_type[floornum]];
104 look->floor_look[i]=look->floor_func[i]->
105 look(vd,vm,ci->floor_param[floornum]);
106 look->residue_func[i]=_residue_P[ci->residue_type[resnum]];
107 look->residue_look[i]=look->residue_func[i]->
108 look(vd,vm,ci->residue_param[resnum]);
110 }
112 look->ch=vi->channels;
114 return(look);
115 }
117 static int ilog(unsigned int v){
118 int ret=0;
119 if(v)--v;
120 while(v){
121 ret++;
122 v>>=1;
123 }
124 return(ret);
125 }
127 /* also responsible for range checking */
128 static vorbis_info_mapping *mapping0_unpack(vorbis_info *vi,oggpack_buffer *opb){
129 int i,b;
130 vorbis_info_mapping0 *info=(vorbis_info_mapping0 *)_ogg_calloc(1,sizeof(*info));
131 codec_setup_info *ci=(codec_setup_info *)vi->codec_setup;
132 memset(info,0,sizeof(*info));
134 b=oggpack_read(opb,1);
135 if(b<0)goto err_out;
136 if(b){
137 info->submaps=oggpack_read(opb,4)+1;
138 if(info->submaps<=0)goto err_out;
139 }else
140 info->submaps=1;
142 b=oggpack_read(opb,1);
143 if(b<0)goto err_out;
144 if(b){
145 info->coupling_steps=oggpack_read(opb,8)+1;
146 if(info->coupling_steps<=0)goto err_out;
147 for(i=0;i<info->coupling_steps;i++){
148 int testM=info->coupling_mag[i]=oggpack_read(opb,ilog(vi->channels));
149 int testA=info->coupling_ang[i]=oggpack_read(opb,ilog(vi->channels));
151 if(testM<0 ||
152 testA<0 ||
153 testM==testA ||
154 testM>=vi->channels ||
155 testA>=vi->channels) goto err_out;
156 }
158 }
160 if(oggpack_read(opb,2)!=0)goto err_out; /* 2,3:reserved */
162 if(info->submaps>1){
163 for(i=0;i<vi->channels;i++){
164 info->chmuxlist[i]=oggpack_read(opb,4);
165 if(info->chmuxlist[i]>=info->submaps || info->chmuxlist[i]<0)goto err_out;
166 }
167 }
168 for(i=0;i<info->submaps;i++){
169 int temp=oggpack_read(opb,8);
170 if(temp>=ci->times)goto err_out;
171 info->floorsubmap[i]=oggpack_read(opb,8);
172 if(info->floorsubmap[i]>=ci->floors || info->floorsubmap[i]<0)goto err_out;
173 info->residuesubmap[i]=oggpack_read(opb,8);
174 if(info->residuesubmap[i]>=ci->residues || info->residuesubmap[i]<0)
175 goto err_out;
176 }
178 return info;
180 err_out:
181 mapping0_free_info(info);
182 return(NULL);
183 }
185 static int seq=0;
186 static int mapping0_inverse(vorbis_block *vb,vorbis_look_mapping *l){
187 vorbis_dsp_state *vd=vb->vd;
188 vorbis_info *vi=vd->vi;
189 codec_setup_info *ci=(codec_setup_info *)vi->codec_setup;
190 private_state *b=(private_state *)vd->backend_state;
191 vorbis_look_mapping0 *look=(vorbis_look_mapping0 *)l;
192 vorbis_info_mapping0 *info=look->map;
194 int i,j;
195 long n=vb->pcmend=ci->blocksizes[vb->W];
197 ogg_int32_t **pcmbundle=(ogg_int32_t **)alloca(sizeof(*pcmbundle)*vi->channels);
198 int *zerobundle=(int *)alloca(sizeof(*zerobundle)*vi->channels);
200 int *nonzero =(int *)alloca(sizeof(*nonzero)*vi->channels);
201 void **floormemo=(void **)alloca(sizeof(*floormemo)*vi->channels);
203 /* time domain information decode (note that applying the
204 information would have to happen later; we'll probably add a
205 function entry to the harness for that later */
206 /* NOT IMPLEMENTED */
208 /* recover the spectral envelope; store it in the PCM vector for now */
209 for(i=0;i<vi->channels;i++){
210 int submap=info->chmuxlist[i];
211 floormemo[i]=look->floor_func[submap]->
212 inverse1(vb,look->floor_look[submap]);
213 if(floormemo[i])
214 nonzero[i]=1;
215 else
216 nonzero[i]=0;
217 memset(vb->pcm[i],0,sizeof(*vb->pcm[i])*n/2);
218 }
220 /* channel coupling can 'dirty' the nonzero listing */
221 for(i=0;i<info->coupling_steps;i++){
222 if(nonzero[info->coupling_mag[i]] ||
223 nonzero[info->coupling_ang[i]]){
224 nonzero[info->coupling_mag[i]]=1;
225 nonzero[info->coupling_ang[i]]=1;
226 }
227 }
229 /* recover the residue into our working vectors */
230 for(i=0;i<info->submaps;i++){
231 int ch_in_bundle=0;
232 for(j=0;j<vi->channels;j++){
233 if(info->chmuxlist[j]==i){
234 if(nonzero[j])
235 zerobundle[ch_in_bundle]=1;
236 else
237 zerobundle[ch_in_bundle]=0;
238 pcmbundle[ch_in_bundle++]=vb->pcm[j];
239 }
240 }
242 look->residue_func[i]->inverse(vb,look->residue_look[i],
243 pcmbundle,zerobundle,ch_in_bundle);
244 }
246 //for(j=0;j<vi->channels;j++)
247 //_analysis_output("coupled",seq+j,vb->pcm[j],-8,n/2,0,0);
250 /* channel coupling */
251 for(i=info->coupling_steps-1;i>=0;i--){
252 ogg_int32_t *pcmM=vb->pcm[info->coupling_mag[i]];
253 ogg_int32_t *pcmA=vb->pcm[info->coupling_ang[i]];
255 for(j=0;j<n/2;j++){
256 ogg_int32_t mag=pcmM[j];
257 ogg_int32_t ang=pcmA[j];
259 if(mag>0)
260 if(ang>0){
261 pcmM[j]=mag;
262 pcmA[j]=mag-ang;
263 }else{
264 pcmA[j]=mag;
265 pcmM[j]=mag+ang;
266 }
267 else
268 if(ang>0){
269 pcmM[j]=mag;
270 pcmA[j]=mag+ang;
271 }else{
272 pcmA[j]=mag;
273 pcmM[j]=mag-ang;
274 }
275 }
276 }
278 //for(j=0;j<vi->channels;j++)
279 //_analysis_output("residue",seq+j,vb->pcm[j],-8,n/2,0,0);
281 /* compute and apply spectral envelope */
282 for(i=0;i<vi->channels;i++){
283 ogg_int32_t *pcm=vb->pcm[i];
284 int submap=info->chmuxlist[i];
285 look->floor_func[submap]->
286 inverse2(vb,look->floor_look[submap],floormemo[i],pcm);
287 }
289 //for(j=0;j<vi->channels;j++)
290 //_analysis_output("mdct",seq+j,vb->pcm[j],-24,n/2,0,1);
292 /* transform the PCM data; takes PCM vector, vb; modifies PCM vector */
293 /* only MDCT right now.... */
294 for(i=0;i<vi->channels;i++){
295 ogg_int32_t *pcm=vb->pcm[i];
296 mdct_backward(n,pcm,pcm);
297 }
299 //for(j=0;j<vi->channels;j++)
300 //_analysis_output("imdct",seq+j,vb->pcm[j],-24,n,0,0);
302 /* window the data */
303 for(i=0;i<vi->channels;i++){
304 ogg_int32_t *pcm=vb->pcm[i];
305 if(nonzero[i])
306 _vorbis_apply_window(pcm,b->window,ci->blocksizes,vb->lW,vb->W,vb->nW);
307 else
308 for(j=0;j<n;j++)
309 pcm[j]=0;
311 }
313 //for(j=0;j<vi->channels;j++)
314 //_analysis_output("window",seq+j,vb->pcm[j],-24,n,0,0);
316 seq+=vi->channels;
317 /* all done! */
318 return(0);
319 }
321 /* export hooks */
322 vorbis_func_mapping mapping0_exportbundle={
323 &mapping0_unpack,
324 &mapping0_look,
325 &mapping0_free_info,
326 &mapping0_free_look,
327 &mapping0_inverse
328 };
