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timefilter: better selftest code. 

Add support for divergence detection and variable period.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-03-02 06:21:48 +01:00
parent ec3cd74f2d
commit a5bf9b351c
1 changed files with 9 additions and 3 deletions
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12
libavdevice/timefilter.c
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@ -89,6 +89,7 @@ int main(void)
#define SAMPLES 1000
double ideal[SAMPLES];
double samples[SAMPLES];
double samplet[SAMPLES];
#if 1
for (n0 = 0; n0 < 40; n0 = 2 * n0 + 1) {
for (n1 = 0; n1 < 10; n1 = 2 * n1 + 1) {
@ -100,13 +101,16 @@ int main(void)
#endif
double best_error = 1000000000;
double bestpar0 = 1;
double bestpar1 = 0.001;
double bestpar1 = 1;
int better, i;
av_lfg_init(&prng, 123);
for (i = 0; i < SAMPLES; i++) {
ideal[i] = 10 + i + n1 * i / (1000);
samplet[i] = 10 + i + (av_lfg_get(&prng) < LFG_MAX/2 ? 0 : 0.999);
ideal[i] = samplet[i] + n1 * i / (1000);
samples[i] = ideal[i] + n0 * (av_lfg_get(&prng) - LFG_MAX / 2) / (LFG_MAX * 10LL);
if(i && samples[i]<samples[i-1])
samples[i]=samples[i-1]+0.001;
}
do {
@ -118,7 +122,9 @@ int main(void)
TimeFilter *tf = ff_timefilter_new(1, par0, par1);
for (i = 0; i < SAMPLES; i++) {
double filtered;
filtered = ff_timefilter_update(tf, samples[i], 1);
filtered = ff_timefilter_update(tf, samples[i], i ? (samplet[i] - samplet[i-1]) : 1);
if(filtered < 0 || filtered > 1000000000)
printf("filter is unstable\n");
error += (filtered - ideal[i]) * (filtered - ideal[i]);
}
ff_timefilter_destroy(tf);