ref: 45b27da44c042e93ca154439ef5fc3b30d05ddaa
dir: /doc/opus_compare.c/
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>
#define OPUS_PI (3.14159265F)
#define OPUS_MIN(_x,_y) ((_x)<(_y)?(_x):(_y))
#define OPUS_MAX(_x,_y) ((_x)>(_y)?(_x):(_y))
#define OPUS_CLAMP(_a,_b,_c) OPUS_MAX(_a,OPUS_MIN(_b,_c))
#define OPUS_COSF(_x) ((float)cos(_x))
#define OPUS_SINF(_x) ((float)sin(_x))
#define OPUS_SQRTF(_x) ((float)sqrt(_x))
#define OPUS_LOG10F(_x) ((float)log10(_x))
static void *check_alloc(void *_ptr){
if(_ptr==NULL){
fprintf(stderr,"Out of memory.\n");
exit(EXIT_FAILURE);
}
return _ptr;
}
static void *opus_malloc(size_t _size){
return check_alloc(malloc(_size));
}
static void *opus_realloc(void *_ptr,size_t _size){
return check_alloc(realloc(_ptr,_size));
}
static size_t read_pcm16(float **_samples,FILE *_fin,
int _nchannels){
unsigned char buf[1024];
float *samples;
size_t nsamples;
size_t csamples;
size_t xi;
size_t nread;
samples=NULL;
nsamples=csamples=0;
for(;;){
nread=fread(buf,2*_nchannels,1024/(2*_nchannels),_fin);
if(nread<=0)break;
if(nsamples+nread>csamples){
do csamples=csamples<<1|1;
while(nsamples+nread>csamples);
samples=(float *)opus_realloc(samples,
_nchannels*csamples*sizeof(*samples));
}
for(xi=0;xi<nread;xi++){
int ci;
for(ci=0;ci<_nchannels;ci++){
int s;
s=buf[2*(xi*_nchannels+ci)+1]<<8|buf[2*(xi*_nchannels+ci)];
s=((s&0xFFFF)^0x8000)-0x8000;
samples[(nsamples+xi)*_nchannels+ci]=s;
}
}
nsamples+=nread;
}
*_samples=(float *)opus_realloc(samples,
_nchannels*nsamples*sizeof(*samples));
return nsamples;
}
static void band_energy(float *_out,const int *_bands,int _nbands,
const float *_in,int _nchannels,size_t _nframes,int _window_sz,
int _step){
float *window;
float *x;
float *c;
float *s;
size_t xi;
int xj;
window=(float *)opus_malloc((3+_nchannels)*_window_sz
*sizeof(*window));
c=window+_window_sz;
s=c+_window_sz;
x=s+_window_sz;
for(xj=0;xj<_window_sz;xj++){
window[xj]=0.5F-0.5F*OPUS_COSF((2*OPUS_PI/(_window_sz-1))*xj);
}
for(xj=0;xj<_window_sz;xj++)
c[xj]=OPUS_COSF((2*OPUS_PI/_window_sz)*xj);
for(xj=0;xj<_window_sz;xj++)
s[xj]=OPUS_SINF((2*OPUS_PI/_window_sz)*xj);
for(xi=0;xi<_nframes;xi++){
int ci;
int xk;
int bi;
for(ci=0;ci<_nchannels;ci++){
for(xk=0;xk<_window_sz;xk++){
x[ci*_window_sz+xk]=window[xk]
*_in[(xi*_step+xk)*_nchannels+ci];
}
}
for(bi=xj=0;bi<_nbands;bi++){
float e2;
e2=0;
for(;xj<_bands[bi+1];xj++){
float p;
p=0;
for(ci=0;ci<_nchannels;ci++){
float re;
float im;
int ti;
ti=0;
re=im=0;
for(xk=0;xk<_window_sz;xk++){
re+=c[ti]*x[ci*_window_sz+xk];
im-=s[ti]*x[ci*_window_sz+xk];
ti+=xj;
if(ti>=_window_sz)ti-=_window_sz;
}
p+=OPUS_SQRTF(re*re+im*im);
}
p*=(1.0F/_nchannels);
e2+=p*p;
}
_out[xi*_nbands+bi]=e2/(_bands[bi+1]-_bands[bi])+1;
}
}
free(window);
}
static int cmp_float(const void *_a,const void *_b){
float a;
float b;
a=*(const float *)_a;
b=*(const float *)_b;
return (a>b)-(a<b);
}
#define NBANDS (21)
/*Bands on which we compute the pseudo-NMR (Bark-derived
CELT bands).*/
static const int BANDS[NBANDS+1]={
0,2,4,6,8,10,12,14,16,20,24,28,32,40,48,56,68,80,96,120,156,200
};
/*Per-band NMR threshold.*/
static const float NMR_THRESH[NBANDS]={
85113.804F,72443.596F,61659.5F, 52480.746F,44668.359F,38018.940F,
32359.366F,27542.287F,23442.288F,19952.623F,16982.437F,14454.398F,
12302.688F,10471.285F, 8912.5094F,7585.7758F,6456.5423F,5495.4087F,
4677.3514F,3981.0717F,3388.4416F
};
/*Noise floor.*/
static const float NOISE_FLOOR[NBANDS]={
8.7096359F,7.5857758F,6.6069345F,5.7543994F,5.0118723F,4.3651583F,
3.8018940F,3.3113112F,2.8840315F,2.5118864F,2.1877616F,1.9054607F,
1.6595869F,1.4454398F,1.2589254F,1.0964782F,0.95499259F,0.83176377F,
0.72443596F,0.63095734F,0.54954087F
};
#define TEST_WIN_SIZE (480)
#define TEST_WIN_STEP (TEST_WIN_SIZE>>1)
int main(int _argc,const char **_argv){
FILE *fin1;
FILE *fin2;
float *x;
float *y;
float *xb;
float *eb;
float *nmr;
float thresh;
float mismatch;
float err;
float nmr_sum;
size_t weight;
size_t xlength;
size_t ylength;
size_t nframes;
size_t xi;
int bi;
int nchannels;
if(_argc<3||_argc>4){
fprintf(stderr,"Usage: %s [-s] <file1.sw> <file2.sw>\n",
_argv[0]);
return EXIT_FAILURE;
}
nchannels=1;
if(strcmp(_argv[1],"-s")==0)nchannels=2;
fin1=fopen(_argv[nchannels],"rb");
if(fin1==NULL){
fprintf(stderr,"Error opening '%s'.\n",_argv[nchannels]);
return EXIT_FAILURE;
}
fin2=fopen(_argv[nchannels+1],"rb");
if(fin2==NULL){
fprintf(stderr,"Error opening '%s'.\n",_argv[nchannels+1]);
fclose(fin1);
return EXIT_FAILURE;
}
/*Read in the data and allocate scratch space.*/
xlength=read_pcm16(&x,fin1,nchannels);
fclose(fin1);
ylength=read_pcm16(&y,fin2,nchannels);
fclose(fin2);
if(xlength!=ylength){
fprintf(stderr,"Sample counts do not match (%lu!=%lu).\n",
(unsigned long)xlength,(unsigned long)ylength);
return EXIT_FAILURE;
}
if(xlength<TEST_WIN_SIZE){
fprintf(stderr,"Insufficient sample data (%lu<%i).\n",
(unsigned long)xlength,TEST_WIN_SIZE);
return EXIT_FAILURE;
}
nframes=(xlength-TEST_WIN_SIZE+TEST_WIN_STEP)/TEST_WIN_STEP;
xb=(float *)opus_malloc(nframes*NBANDS*sizeof(*xb));
eb=(float *)opus_malloc(nframes*NBANDS*sizeof(*eb));
nmr=(float *)opus_malloc(nframes*NBANDS*sizeof(*nmr));
/*Compute the error signal.*/
for(xi=0;xi<xlength*nchannels;xi++){
err=x[xi]-y[xi];
y[xi]=err-OPUS_CLAMP(-1,err,1);
}
/*Compute the per-band spectral energy of the original signal
and the error.*/
band_energy(xb,BANDS,NBANDS,x,nchannels,nframes,
TEST_WIN_SIZE,TEST_WIN_STEP);
free(x);
band_energy(eb,BANDS,NBANDS,y,nchannels,nframes,
TEST_WIN_SIZE,TEST_WIN_STEP);
free(y);
nmr_sum=0;
for(xi=0;xi<nframes;xi++){
/*Frequency masking (low to high): 10 dB/Bark slope.*/
for(bi=1;bi<NBANDS;bi++)
xb[xi*NBANDS+bi]+=0.1F*xb[xi*NBANDS+bi-1];
/*Frequency masking (high to low): 15 dB/Bark slope.*/
for(bi=NBANDS-1;bi-->0;)
xb[xi*NBANDS+bi]+=0.03F*xb[xi*NBANDS+bi+1];
if(xi>0){
/*Temporal masking: 5 dB/5ms slope.*/
for(bi=0;bi<NBANDS;bi++)
xb[xi*NBANDS+bi]+=0.3F*xb[(xi-1)*NBANDS+bi];
}
/*Compute NMR.*/
for(bi=0;bi<NBANDS;bi++){
nmr[xi*NBANDS+bi]=xb[xi*NBANDS+bi]/eb[xi*NBANDS+bi];
nmr_sum+=10*OPUS_LOG10F(nmr[xi*NBANDS+bi]);
}
}
/*Find the 90th percentile of the errors.*/
memcpy(xb,eb,nframes*NBANDS*sizeof(*xb));
qsort(xb,nframes*NBANDS,sizeof(*xb),cmp_float);
thresh=xb[(9*nframes*NBANDS+5)/10];
free(xb);
/*Compute the mismatch.*/
mismatch=0;
weight=0;
for(xi=0;xi<nframes;xi++){
for(bi=0;bi<NBANDS;bi++){
if(eb[xi*NBANDS+bi]>thresh){
mismatch+=NMR_THRESH[bi]/nmr[xi*NBANDS+bi];
weight++;
}
}
}
free(nmr);
free(eb);
printf("Average pseudo-NMR: %3.2f dB\n",nmr_sum/(nframes*NBANDS));
if(weight<=0){
err=-100;
printf("Mismatch level: below noise floor\n");
}
else{
err=10*OPUS_LOG10F(mismatch/weight);
printf("Weighted mismatch: %3.2f dB\n",err);
}
printf("\n");
if(err<0){
printf("**Decoder PASSES test (mismatch < 0 dB)\n");
return EXIT_SUCCESS;
}
printf("**Decoder FAILS test (mismatch >= 0 dB)\n");
return EXIT_FAILURE;
}