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-rw-r--r--vorbis/vq/metrics.c294
1 files changed, 0 insertions, 294 deletions
diff --git a/vorbis/vq/metrics.c b/vorbis/vq/metrics.c
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-/********************************************************************
- * *
- * THIS FILE IS PART OF THE OggVorbis SOFTWARE 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 SOURCE CODE IS (C) COPYRIGHT 1994-2001 *
- * by the Xiph.Org Foundation http://www.xiph.org/ *
- * *
- ********************************************************************
-
- function: function calls to collect codebook metrics
-
- ********************************************************************/
-
-
-#include <stdlib.h>
-#include <unistd.h>
-#include <math.h>
-#include "bookutil.h"
-
-/* collect the following metrics:
-
- mean and mean squared amplitude
- mean and mean squared error
- mean and mean squared error (per sample) by entry
- worst case fit by entry
- entry cell size
- hits by entry
- total bits
- total samples
- (average bits per sample)*/
-
-
-/* set up metrics */
-
-float meanamplitude_acc=0.f;
-float meanamplitudesq_acc=0.f;
-float meanerror_acc=0.f;
-float meanerrorsq_acc=0.f;
-
-float **histogram=NULL;
-float **histogram_error=NULL;
-float **histogram_errorsq=NULL;
-float **histogram_hi=NULL;
-float **histogram_lo=NULL;
-float bits=0.f;
-float count=0.f;
-
-static float *_now(codebook *c, int i){
- return c->valuelist+i*c->c->dim;
-}
-
-int books=0;
-
-void process_preprocess(codebook **bs,char *basename){
- int i;
- while(bs[books])books++;
-
- if(books){
- histogram=_ogg_calloc(books,sizeof(float *));
- histogram_error=_ogg_calloc(books,sizeof(float *));
- histogram_errorsq=_ogg_calloc(books,sizeof(float *));
- histogram_hi=_ogg_calloc(books,sizeof(float *));
- histogram_lo=_ogg_calloc(books,sizeof(float *));
- }else{
- fprintf(stderr,"Specify at least one codebook\n");
- exit(1);
- }
-
- for(i=0;i<books;i++){
- codebook *b=bs[i];
- histogram[i]=_ogg_calloc(b->entries,sizeof(float));
- histogram_error[i]=_ogg_calloc(b->entries*b->dim,sizeof(float));
- histogram_errorsq[i]=_ogg_calloc(b->entries*b->dim,sizeof(float));
- histogram_hi[i]=_ogg_calloc(b->entries*b->dim,sizeof(float));
- histogram_lo[i]=_ogg_calloc(b->entries*b->dim,sizeof(float));
- }
-}
-
-static float _dist(int el,float *a, float *b){
- int i;
- float acc=0.f;
- for(i=0;i<el;i++){
- float val=(a[i]-b[i]);
- acc+=val*val;
- }
- return acc;
-}
-
-void cell_spacing(codebook *c){
- int j,k;
- float min=-1.f,max=-1.f,mean=0.f,meansq=0.f;
- long total=0;
-
- /* minimum, maximum, mean, ms cell spacing */
- for(j=0;j<c->c->entries;j++){
- if(c->c->lengthlist[j]>0){
- float localmin=-1.;
- for(k=0;k<c->c->entries;k++){
- if(c->c->lengthlist[k]>0){
- float this=_dist(c->c->dim,_now(c,j),_now(c,k));
- if(j!=k &&
- (localmin==-1 || this<localmin))
- localmin=this;
- }
- }
-
- if(min==-1 || localmin<min)min=localmin;
- if(max==-1 || localmin>max)max=localmin;
- mean+=sqrt(localmin);
- meansq+=localmin;
- total++;
- }
- }
-
- fprintf(stderr,"\tminimum cell spacing (closest side): %g\n",sqrt(min));
- fprintf(stderr,"\tmaximum cell spacing (closest side): %g\n",sqrt(max));
- fprintf(stderr,"\tmean closest side spacing: %g\n",mean/total);
- fprintf(stderr,"\tmean sq closest side spacing: %g\n",sqrt(meansq/total));
-}
-
-void process_postprocess(codebook **bs,char *basename){
- int i,k,book;
- char *buffer=alloca(strlen(basename)+80);
-
- fprintf(stderr,"Done. Processed %ld data points:\n\n",
- (long)count);
-
- fprintf(stderr,"Global statistics:******************\n\n");
-
- fprintf(stderr,"\ttotal samples: %ld\n",(long)count);
- fprintf(stderr,"\ttotal bits required to code: %ld\n",(long)bits);
- fprintf(stderr,"\taverage bits per sample: %g\n\n",bits/count);
-
- fprintf(stderr,"\tmean sample amplitude: %g\n",
- meanamplitude_acc/count);
- fprintf(stderr,"\tmean squared sample amplitude: %g\n\n",
- sqrt(meanamplitudesq_acc/count));
-
- fprintf(stderr,"\tmean code error: %g\n",
- meanerror_acc/count);
- fprintf(stderr,"\tmean squared code error: %g\n\n",
- sqrt(meanerrorsq_acc/count));
-
- for(book=0;book<books;book++){
- FILE *out;
- codebook *b=bs[book];
- int n=b->c->entries;
- int dim=b->c->dim;
-
- fprintf(stderr,"Book %d statistics:------------------\n",book);
-
- cell_spacing(b);
-
- sprintf(buffer,"%s-%d-mse.m",basename,book);
- out=fopen(buffer,"w");
- if(!out){
- fprintf(stderr,"Could not open file %s for writing\n",buffer);
- exit(1);
- }
-
- for(i=0;i<n;i++){
- for(k=0;k<dim;k++){
- fprintf(out,"%d, %g, %g\n",
- i*dim+k,(b->valuelist+i*dim)[k],
- sqrt((histogram_errorsq[book]+i*dim)[k]/histogram[book][i]));
- }
- }
- fclose(out);
-
- sprintf(buffer,"%s-%d-me.m",basename,book);
- out=fopen(buffer,"w");
- if(!out){
- fprintf(stderr,"Could not open file %s for writing\n",buffer);
- exit(1);
- }
-
- for(i=0;i<n;i++){
- for(k=0;k<dim;k++){
- fprintf(out,"%d, %g, %g\n",
- i*dim+k,(b->valuelist+i*dim)[k],
- (histogram_error[book]+i*dim)[k]/histogram[book][i]);
- }
- }
- fclose(out);
-
- sprintf(buffer,"%s-%d-worst.m",basename,book);
- out=fopen(buffer,"w");
- if(!out){
- fprintf(stderr,"Could not open file %s for writing\n",buffer);
- exit(1);
- }
-
- for(i=0;i<n;i++){
- for(k=0;k<dim;k++){
- fprintf(out,"%d, %g, %g, %g\n",
- i*dim+k,(b->valuelist+i*dim)[k],
- (b->valuelist+i*dim)[k]+(histogram_lo[book]+i*dim)[k],
- (b->valuelist+i*dim)[k]+(histogram_hi[book]+i*dim)[k]);
- }
- }
- fclose(out);
- }
-}
-
-float process_one(codebook *b,int book,float *a,int dim,int step,int addmul,
- float base){
- int j,entry;
- float amplitude=0.f;
-
- if(book==0){
- float last=base;
- for(j=0;j<dim;j++){
- amplitude=a[j*step]-(b->c->q_sequencep?last:0);
- meanamplitude_acc+=fabs(amplitude);
- meanamplitudesq_acc+=amplitude*amplitude;
- count++;
- last=a[j*step];
- }
- }
-
- if(b->c->q_sequencep){
- float temp;
- for(j=0;j<dim;j++){
- temp=a[j*step];
- a[j*step]-=base;
- }
- base=temp;
- }
-
- entry=vorbis_book_besterror(b,a,step,addmul);
-
- if(entry==-1){
- fprintf(stderr,"Internal error: _best returned -1.\n");
- exit(1);
- }
-
- histogram[book][entry]++;
- bits+=vorbis_book_codelen(b,entry);
-
- for(j=0;j<dim;j++){
- float error=a[j*step];
-
- if(book==books-1){
- meanerror_acc+=fabs(error);
- meanerrorsq_acc+=error*error;
- }
- histogram_errorsq[book][entry*dim+j]+=error*error;
- histogram_error[book][entry*dim+j]+=fabs(error);
- if(histogram[book][entry]==0 || histogram_hi[book][entry*dim+j]<error)
- histogram_hi[book][entry*dim+j]=error;
- if(histogram[book][entry]==0 || histogram_lo[book][entry*dim+j]>error)
- histogram_lo[book][entry*dim+j]=error;
- }
- return base;
-}
-
-
-void process_vector(codebook **bs,int *addmul,int inter,float *a,int n){
- int bi;
- int i;
-
- for(bi=0;bi<books;bi++){
- codebook *b=bs[bi];
- int dim=b->dim;
- float base=0.f;
-
- if(inter){
- for(i=0;i<n/dim;i++)
- base=process_one(b,bi,a+i,dim,n/dim,addmul[bi],base);
- }else{
- for(i=0;i<=n-dim;i+=dim)
- base=process_one(b,bi,a+i,dim,1,addmul[bi],base);
- }
- }
-
- if((long)(count)%100)spinnit("working.... samples: ",count);
-}
-
-void process_usage(void){
- fprintf(stderr,
- "usage: vqmetrics [-i] +|*<codebook>.vqh [ +|*<codebook.vqh> ]... \n"
- " datafile.vqd [datafile.vqd]...\n\n"
- " data can be taken on stdin. -i indicates interleaved coding.\n"
- " Output goes to output files:\n"
- " basename-me.m: gnuplot: mean error by entry value\n"
- " basename-mse.m: gnuplot: mean square error by entry value\n"
- " basename-worst.m: gnuplot: worst error by entry value\n"
- " basename-distance.m: gnuplot file showing distance probability\n"
- "\n");
-
-}
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