1 /********************************************************************
3 * THIS FILE IS PART OF THE Ogg Vorbis SOFTWARE CODEC SOURCE CODE. *
4 * USE, DISTRIBUTION AND REPRODUCTION OF THIS SOURCE IS GOVERNED BY *
5 * THE GNU PUBLIC LICENSE 2, WHICH IS INCLUDED WITH THIS SOURCE. *
6 * PLEASE READ THESE TERMS DISTRIBUTING. *
8 * THE OggSQUISH 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 1.12 2000/05/08 20:49:49 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,
28 #include "vorbis/codec.h"
31 #include "bookinternal.h"
32 #include "sharedbook.h"
37 vorbis_info_residue0 *info;
41 codebook ***partbooks;
45 } vorbis_look_residue0;
47 void free_info(vorbis_info_residue *i){
49 memset(i,0,sizeof(vorbis_info_residue0));
54 void free_look(vorbis_look_residue *i){
57 vorbis_look_residue0 *look=(vorbis_look_residue0 *)i;
58 for(j=0;j<look->parts;j++)
59 if(look->partbooks[j])free(look->partbooks[j]);
60 free(look->partbooks);
61 for(j=0;j<look->partvals;j++)
62 free(look->decodemap[j]);
63 free(look->decodemap);
64 memset(i,0,sizeof(vorbis_look_residue0));
69 void pack(vorbis_info_residue *vr,oggpack_buffer *opb){
70 vorbis_info_residue0 *info=(vorbis_info_residue0 *)vr;
72 _oggpack_write(opb,info->begin,24);
73 _oggpack_write(opb,info->end,24);
75 _oggpack_write(opb,info->grouping-1,24); /* residue vectors to group and
76 code with a partitioned book */
77 _oggpack_write(opb,info->partitions-1,6); /* possible partition choices */
78 _oggpack_write(opb,info->groupbook,8); /* group huffman book */
79 for(j=0;j<info->partitions;j++){
80 _oggpack_write(opb,info->secondstages[j],4); /* zero *is* a valid choice */
81 acc+=info->secondstages[j];
84 _oggpack_write(opb,info->booklist[j],8);
88 /* vorbis_info is for range checking */
89 vorbis_info_residue *unpack(vorbis_info *vi,oggpack_buffer *opb){
91 vorbis_info_residue0 *info=calloc(1,sizeof(vorbis_info_residue0));
93 info->begin=_oggpack_read(opb,24);
94 info->end=_oggpack_read(opb,24);
95 info->grouping=_oggpack_read(opb,24)+1;
96 info->partitions=_oggpack_read(opb,6)+1;
97 info->groupbook=_oggpack_read(opb,8);
98 for(j=0;j<info->partitions;j++){
99 acc+=info->secondstages[j]=_oggpack_read(opb,4);
102 info->booklist[j]=_oggpack_read(opb,8);
104 if(info->groupbook>=vi->books)goto errout;
106 if(info->booklist[j]>=vi->books)goto errout;
114 vorbis_look_residue *look (vorbis_dsp_state *vd,vorbis_info_mode *vm,
115 vorbis_info_residue *vr){
116 vorbis_info_residue0 *info=(vorbis_info_residue0 *)vr;
117 vorbis_look_residue0 *look=calloc(1,sizeof(vorbis_look_residue0));
122 look->parts=info->partitions;
123 look->phrasebook=vd->fullbooks+info->groupbook;
124 dim=look->phrasebook->dim;
126 look->partbooks=calloc(look->parts,sizeof(codebook **));
128 for(j=0;j<look->parts;j++){
129 int stages=info->secondstages[j];
131 look->partbooks[j]=malloc(stages*sizeof(codebook *));
132 for(k=0;k<stages;k++)
133 look->partbooks[j][k]=vd->fullbooks+info->booklist[acc++];
137 look->partvals=rint(pow(look->parts,dim));
138 look->decodemap=malloc(look->partvals*sizeof(int *));
139 for(j=0;j<look->partvals;j++){
141 long mult=look->partvals/look->parts;
142 look->decodemap[j]=malloc(dim*sizeof(int));
147 look->decodemap[j][k]=deco;
154 /* classify by max quantized amplitude only */
155 static int _testhack(double *vec,int n,vorbis_look_residue0 *look){
156 vorbis_info_residue0 *info=look->info;
161 if(fabs(vec[i])>max)max=fabs(vec[i]);
163 for(i=0;i<look->parts-1;i++)
164 if(max>=info->ampmax[i])
169 static int _encodepart(oggpack_buffer *opb,double *vec, int n,
170 int stages, codebook **books){
173 for(j=0;j<stages;j++){
174 int dim=books[j]->dim;
177 bits+=vorbis_book_encodevs(books[j],vec+i,opb,step,0);
184 static int _decodepart(oggpack_buffer *opb,double *work,double *vec, int n,
185 int stages, codebook **books){
188 memset(work,0,sizeof(double)*n);
189 for(j=0;j<stages;j++){
190 int dim=books[j]->dim;
193 vorbis_book_decodevs(books[j],work+i,opb,step,0);
202 int forward(vorbis_block *vb,vorbis_look_residue *vl,
205 vorbis_look_residue0 *look=(vorbis_look_residue0 *)vl;
206 vorbis_info_residue0 *info=look->info;
208 /* move all this setup out later */
209 int samples_per_partition=info->grouping;
210 int possible_partitions=info->partitions;
211 int partitions_per_word=look->phrasebook->dim;
212 int n=info->end-info->begin;
213 long phrasebits=0,resbitsT=0;
214 long *resbits=alloca(sizeof(long)*possible_partitions);
215 long *resvals=alloca(sizeof(long)*possible_partitions);
217 int partvals=n/samples_per_partition;
218 int partwords=(partvals+partitions_per_word-1)/partitions_per_word;
219 long **partword=_vorbis_block_alloc(vb,ch*sizeof(long *));
220 partvals=partwords*partitions_per_word;
222 /* we find the patition type for each partition of each
223 channel. We'll go back and do the interleaved encoding in a
224 bit. For now, clarity */
226 memset(resbits,0,sizeof(long)*possible_partitions);
227 memset(resvals,0,sizeof(long)*possible_partitions);
230 partword[i]=_vorbis_block_alloc(vb,n/samples_per_partition*sizeof(long));
231 memset(partword[i],0,n/samples_per_partition*sizeof(long));
234 for(i=info->begin,l=0;i<info->end;i+=samples_per_partition,l++)
236 /* do the partition decision based on the number of 'bits'
237 needed to encode the block */
238 partword[j][l]=_testhack(in[j]+i,samples_per_partition,look);
240 /* we code the partition words for each channel, then the residual
241 words for a partition per channel until we've written all the
242 residual words for that partition word. Then write the next
243 parition channel words... */
245 for(i=info->begin,l=0;i<info->end;){
246 /* first we encode a partition codeword for each channel */
248 long val=partword[j][l];
249 for(k=1;k<partitions_per_word;k++)
250 val= val*possible_partitions+partword[j][l+k];
251 phrasebits+=vorbis_book_encode(look->phrasebook,val,&vb->opb);
253 /* now we encode interleaved residual values for the partitions */
254 for(k=0;k<partitions_per_word;k++,l++,i+=samples_per_partition)
256 resbits[partword[j][l]]+=
257 _encodepart(&vb->opb,in[j]+i,samples_per_partition,
258 info->secondstages[partword[j][l]],
259 look->partbooks[partword[j][l]]);
260 resvals[partword[j][l]]+=samples_per_partition;
265 for(i=0;i<possible_partitions;i++)resbitsT+=resbits[i];
267 "Encoded %ld res vectors in %ld phrasing and %ld res bits\n\t",
268 ch*(info->end-info->begin),phrasebits,resbitsT);
269 for(i=0;i<possible_partitions;i++)
270 fprintf(stderr,"%ld(%ld):%ld ",i,resvals[i],resbits[i]);
271 fprintf(stderr,"\n");
276 int inverse(vorbis_block *vb,vorbis_look_residue *vl,double **in,int ch){
278 vorbis_look_residue0 *look=(vorbis_look_residue0 *)vl;
279 vorbis_info_residue0 *info=look->info;
281 /* move all this setup out later */
282 int samples_per_partition=info->grouping;
283 int partitions_per_word=look->phrasebook->dim;
284 int n=info->end-info->begin;
286 int partvals=n/samples_per_partition;
287 int partwords=(partvals+partitions_per_word-1)/partitions_per_word;
288 int **partword=alloca(ch*sizeof(long *));
289 double *work=alloca(sizeof(double)*samples_per_partition);
290 partvals=partwords*partitions_per_word;
292 for(i=info->begin,l=0;i<info->end;){
293 /* fetch the partition word for each channel */
295 int temp=vorbis_book_decode(look->phrasebook,&vb->opb);
296 partword[j]=look->decodemap[temp];
297 if(partword[j]==NULL)exit(1);
300 /* now we decode interleaved residual values for the partitions */
301 for(k=0;k<partitions_per_word;k++,l++,i+=samples_per_partition)
303 int part=partword[j][k];
304 _decodepart(&vb->opb,work,in[j]+i,samples_per_partition,
305 info->secondstages[part],
306 look->partbooks[part]);
313 vorbis_func_residue residue0_exportbundle={