/*
* Delay Locked Loop based time filter
* Copyright (c) 2009 Samalyse
+ * Copyright (c) 2009 Michael Niedermayer
* Author: Olivier Guilyardi <olivier samalyse com>
+ * Michael Niedermayer <michaelni gmx at>
*
* This file is part of FFmpeg.
*
}
#ifdef TEST
+#include "libavutil/lfg.h"
+#define LFG_MAX ((1LL << 32) - 1)
+
int main(void)
{
+ AVLFG prng;
double n0,n1;
#define SAMPLES 1000
double ideal[SAMPLES];
double samples[SAMPLES];
+#if 1
for(n0= 0; n0<40; n0=2*n0+1){
for(n1= 0; n1<10; n1=2*n1+1){
+#else
+ {{
+ n0=7;
+ n1=1;
+#endif
double best_error= 1000000000;
double bestpar0=1;
double bestpar1=0.001;
int better, i;
- srandom(123);
+ av_lfg_init(&prng, 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);
+ samples[i] = ideal[i] + n0 * (av_lfg_get(&prng) - LFG_MAX / 2)
+ / (LFG_MAX * 10LL);
}
do{
}
}
}while(better);
- printf(" [%f %f %f]", bestpar0, bestpar1, best_error);
+#if 0
+ double lastfil=9;
+ TimeFilter *tf= ff_timefilter_new(1, bestpar0, bestpar1);
+ for(i=0; i<SAMPLES; i++){
+ double filtered;
+ filtered= ff_timefilter_update(tf, samples[i], 1);
+ printf("%f %f %f %f\n", i - samples[i] + 10, filtered - samples[i], samples[FFMAX(i, 1)] - samples[FFMAX(i-1, 0)], filtered - lastfil);
+ lastfil= filtered;
+ }
+ ff_timefilter_destroy(tf);
+#else
+ printf(" [%f %f %9f]", bestpar0, bestpar1, best_error);
+#endif
}
printf("\n");
}