1 /********************************************************************
3 * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
4 * USE, DISTRIBUTION AND REPRODUCTION OF THIS SOURCE IS GOVERNED BY *
5 * THE GNU LESSER/LIBRARY PUBLIC LICENSE, WHICH IS INCLUDED WITH *
6 * THIS SOURCE. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
8 * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2000 *
9 * by Monty <monty@xiph.org> and the XIPHOPHORUS Company *
10 * http://www.xiph.org/ *
12 ********************************************************************
14 function: residue backend 0 implementation
15 last mod: $Id: res0.c,v 1.24 2001/01/22 01:38:25 xiphmont Exp $
17 ********************************************************************/
19 /* Slow, slow, slow, simpleminded and did I mention it was slow? The
20 encode/decode loops are coded for clarity and performance is not
21 yet even a nagging little idea lurking in the shadows. Oh and BTW,
29 #include "vorbis/codec.h"
30 #include "codec_internal.h"
37 vorbis_info_residue0 *info;
42 codebook ***partbooks;
46 } vorbis_look_residue0;
48 vorbis_info_residue *res0_copy_info(vorbis_info_residue *vr){
49 vorbis_info_residue0 *info=(vorbis_info_residue0 *)vr;
50 vorbis_info_residue0 *ret=_ogg_malloc(sizeof(vorbis_info_residue0));
51 memcpy(ret,info,sizeof(vorbis_info_residue0));
55 void res0_free_info(vorbis_info_residue *i){
57 memset(i,0,sizeof(vorbis_info_residue0));
62 void res0_free_look(vorbis_look_residue *i){
65 vorbis_look_residue0 *look=(vorbis_look_residue0 *)i;
66 for(j=0;j<look->parts;j++)
67 if(look->partbooks[j])_ogg_free(look->partbooks[j]);
68 _ogg_free(look->partbooks);
69 for(j=0;j<look->partvals;j++)
70 _ogg_free(look->decodemap[j]);
71 _ogg_free(look->decodemap);
72 memset(i,0,sizeof(vorbis_look_residue0));
77 void res0_pack(vorbis_info_residue *vr,oggpack_buffer *opb){
78 vorbis_info_residue0 *info=(vorbis_info_residue0 *)vr;
80 oggpack_write(opb,info->begin,24);
81 oggpack_write(opb,info->end,24);
83 oggpack_write(opb,info->grouping-1,24); /* residue vectors to group and
84 code with a partitioned book */
85 oggpack_write(opb,info->partitions-1,6); /* possible partition choices */
86 oggpack_write(opb,info->groupbook,8); /* group huffman book */
87 for(j=0;j<info->partitions;j++){
88 oggpack_write(opb,info->secondstages[j],4); /* zero *is* a valid choice */
89 acc+=info->secondstages[j];
92 oggpack_write(opb,info->booklist[j],8);
96 /* vorbis_info is for range checking */
97 vorbis_info_residue *res0_unpack(vorbis_info *vi,oggpack_buffer *opb){
99 vorbis_info_residue0 *info=_ogg_calloc(1,sizeof(vorbis_info_residue0));
100 codec_setup_info *ci=vi->codec_setup;
102 info->begin=oggpack_read(opb,24);
103 info->end=oggpack_read(opb,24);
104 info->grouping=oggpack_read(opb,24)+1;
105 info->partitions=oggpack_read(opb,6)+1;
106 info->groupbook=oggpack_read(opb,8);
107 for(j=0;j<info->partitions;j++){
108 int cascade=info->secondstages[j]=oggpack_read(opb,4);
109 if(cascade>1)goto errout; /* temporary! when cascading gets
110 reworked and actually used, we don't
111 want old code to DTWT */
115 info->booklist[j]=oggpack_read(opb,8);
116 if(info->booklist[j]==255)info->booklist[j]=-1;
119 if(info->groupbook>=ci->books)goto errout;
121 if(info->booklist[j]>=ci->books)goto errout;
125 res0_free_info(info);
129 vorbis_look_residue *res0_look (vorbis_dsp_state *vd,vorbis_info_mode *vm,
130 vorbis_info_residue *vr){
131 vorbis_info_residue0 *info=(vorbis_info_residue0 *)vr;
132 vorbis_look_residue0 *look=_ogg_calloc(1,sizeof(vorbis_look_residue0));
133 backend_lookup_state *be=vd->backend_state;
138 look->map=vm->mapping;
140 look->parts=info->partitions;
141 look->phrasebook=be->fullbooks+info->groupbook;
142 dim=look->phrasebook->dim;
144 look->partbooks=_ogg_calloc(look->parts,sizeof(codebook **));
146 for(j=0;j<look->parts;j++){
147 int stages=info->secondstages[j];
149 look->partbooks[j]=_ogg_malloc(stages*sizeof(codebook *));
150 look->partbooks[j][0]=be->fullbooks+info->booklist[acc++];
154 look->partvals=rint(pow(look->parts,dim));
155 look->decodemap=_ogg_malloc(look->partvals*sizeof(int *));
156 for(j=0;j<look->partvals;j++){
158 long mult=look->partvals/look->parts;
159 look->decodemap[j]=_ogg_malloc(dim*sizeof(int));
164 look->decodemap[j][k]=deco;
172 /* does not guard against invalid settings; eg, a subn of 16 and a
173 subgroup request of 32. Max subn of 128 */
174 static int _testhack(float *vec,int n,vorbis_look_residue0 *look,
175 int auxparts,int auxpartnum){
176 vorbis_info_residue0 *info=look->info;
178 float max,localmax=0.f;
183 for(i=0;i<n;i++)temp[i]=fabs(vec[i]);
185 /* handle case subgrp==1 outside */
187 if(temp[i]>localmax)localmax=temp[i];
190 for(i=0;i<n;i++)temp[i]=rint(temp[i]);
203 if(temp[i]>localmax)localmax=temp[i];
206 for(i=0;i<auxparts-1;i++)
207 if(auxpartnum<info->blimit[i] &&
208 entropy[info->subgrp[i]]<=info->entmax[i] &&
209 max<=info->ampmax[i])
215 static int _encodepart(oggpack_buffer *opb,float *vec, int n,
216 int stages, codebook **books,int mode,int part){
219 int dim=books[j]->dim;
222 int entry=vorbis_book_besterror(books[j],vec+i,step,0);
227 sprintf(buf,"res0_%da%d_%d.vqd",mode,j,part);
229 fprintf(f,"%d\n",entry);
233 bits+=vorbis_book_encode(books[j],entry,opb);
239 static int _decodepart(oggpack_buffer *opb,float *work,float *vec, int n,
240 int stages, codebook **books){
243 memset(work,0,sizeof(float)*n);
245 int dim=books[0]->dim;
247 if(s_vorbis_book_decodevs(books[0],work,opb,step,0)==-1)
257 int res0_forward(vorbis_block *vb,vorbis_look_residue *vl,
260 vorbis_look_residue0 *look=(vorbis_look_residue0 *)vl;
261 vorbis_info_residue0 *info=look->info;
263 /* move all this setup out later */
264 int samples_per_partition=info->grouping;
265 int possible_partitions=info->partitions;
266 int partitions_per_word=look->phrasebook->dim;
267 int n=info->end-info->begin;
268 long phrasebits=0,resbitsT=0;
269 long *resbits=alloca(sizeof(long)*possible_partitions);
270 long *resvals=alloca(sizeof(long)*possible_partitions);
272 int partvals=n/samples_per_partition;
273 int partwords=(partvals+partitions_per_word-1)/partitions_per_word;
274 long **partword=_vorbis_block_alloc(vb,ch*sizeof(long *));
276 partvals=partwords*partitions_per_word;
278 /* we find the patition type for each partition of each
279 channel. We'll go back and do the interleaved encoding in a
280 bit. For now, clarity */
282 memset(resbits,0,sizeof(long)*possible_partitions);
283 memset(resvals,0,sizeof(long)*possible_partitions);
286 partword[i]=_vorbis_block_alloc(vb,n/samples_per_partition*sizeof(long));
287 memset(partword[i],0,n/samples_per_partition*sizeof(long));
290 for(i=info->begin,l=0;i<info->end;i+=samples_per_partition,l++){
292 /* do the partition decision based on the number of 'bits'
293 needed to encode the block */
295 _testhack(in[j]+i,samples_per_partition,look,possible_partitions,l);
298 /* we code the partition words for each channel, then the residual
299 words for a partition per channel until we've written all the
300 residual words for that partition word. Then write the next
301 partition channel words... */
303 for(i=info->begin,l=0;i<info->end;){
305 /* first we encode a partition codeword for each channel */
307 long val=partword[j][l];
308 for(k=1;k<partitions_per_word;k++)
309 val= val*possible_partitions+partword[j][l+k];
310 phrasebits+=vorbis_book_encode(look->phrasebook,val,&vb->opb);
312 /* now we encode interleaved residual values for the partitions */
313 for(k=0;k<partitions_per_word;k++,l++,i+=samples_per_partition)
315 /*resbits[partword[j][l]]+=*/
316 resbitsT+=_encodepart(&vb->opb,in[j]+i,samples_per_partition,
317 info->secondstages[partword[j][l]],
318 look->partbooks[partword[j][l]],look->map,partword[j][l]);
319 resvals[partword[j][l]]+=samples_per_partition;
324 for(i=0;i<possible_partitions;i++)resbitsT+=resbits[i];
326 "Encoded %ld res vectors in %ld phrasing and %ld res bits\n\t",
327 ch*(info->end-info->begin),phrasebits,resbitsT);
328 for(i=0;i<possible_partitions;i++)
329 fprintf(stderr,"%ld(%ld):%ld ",i,resvals[i],resbits[i]);
330 fprintf(stderr,"\n");*/
335 /* a truncated packet here just means 'stop working'; it's not an error */
336 int res0_inverse(vorbis_block *vb,vorbis_look_residue *vl,float **in,int ch){
337 long i,j,k,l,transend=vb->pcmend/2;
338 vorbis_look_residue0 *look=(vorbis_look_residue0 *)vl;
339 vorbis_info_residue0 *info=look->info;
341 /* move all this setup out later */
342 int samples_per_partition=info->grouping;
343 int partitions_per_word=look->phrasebook->dim;
344 int n=info->end-info->begin;
346 int partvals=n/samples_per_partition;
347 int partwords=(partvals+partitions_per_word-1)/partitions_per_word;
348 int **partword=alloca(ch*sizeof(long *));
349 float *work=alloca(sizeof(float)*samples_per_partition);
350 partvals=partwords*partitions_per_word;
352 /* make sure we're zeroed up to the start */
354 memset(in[j],0,sizeof(float)*info->begin);
356 for(i=info->begin,l=0;i<info->end;){
357 /* fetch the partition word for each channel */
359 int temp=vorbis_book_decode(look->phrasebook,&vb->opb);
360 if(temp==-1)goto eopbreak;
361 partword[j]=look->decodemap[temp];
362 if(partword[j]==NULL)goto errout;
365 /* now we decode interleaved residual values for the partitions */
366 for(k=0;k<partitions_per_word;k++,l++,i+=samples_per_partition)
368 int part=partword[j][k];
369 if(_decodepart(&vb->opb,work,in[j]+i,samples_per_partition,
370 info->secondstages[part],
371 look->partbooks[part])==-1)goto eopbreak;
378 memset(in[j]+i,0,sizeof(float)*(transend-i));
385 memset(in[j],0,sizeof(float)*transend);
389 vorbis_func_residue residue0_exportbundle={