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Selftest code.

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Originally committed as revision 17844 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2009-03-06 00:26:51 +00:00
parent 8537591abc
commit 1b85ec1ea2
1 changed files with 48 additions and 0 deletions
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48
libavformat/timefilter.c
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@ -72,3 +72,51 @@ double ff_timefilter_update(TimeFilter *self, double system_time, double period)
}
return self->cycle_time;
}
#ifdef TEST
main(){
double n0,n1;
#define SAMPLES 1000
double ideal[SAMPLES];
double samples[SAMPLES];
for(n0= 0; n0<40; n0=2*n0+1){
for(n1= 0; n1<10; n1=2*n1+1){
double best_error= 1000000000;
double bestpar0=1;
double bestpar1=0.001;
int better, i;
srandom(123);
for(i=0; i<SAMPLES; i++){
ideal[i] = 10 + i + n1*i/(1000);
samples[i]= ideal[i] + n0*(rand()-RAND_MAX/2)/(RAND_MAX*10LL);
}
do{
double par0, par1;
better=0;
for(par0= bestpar0*0.8; par0<=bestpar0*1.21; par0+=bestpar0*0.05){
for(par1= bestpar1*0.8; par1<=bestpar1*1.21; par1+=bestpar1*0.05){
double error=0;
TimeFilter *tf= ff_timefilter_new(par0, par1);
for(i=0; i<SAMPLES; i++){
double filtered;
filtered= ff_timefilter_update(tf, samples[i], 1);
error += (filtered - ideal[i]) * (filtered - ideal[i]);
}
ff_timefilter_destroy(tf);
if(error < best_error){
best_error= error;
bestpar0= par0;
bestpar1= par1;
better=1;
}
}
}
}while(better);
printf(" [%f %f %f]", bestpar0, bestpar1, best_error);
}
printf("\n");
}
}
#endif