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authorMichael Niedermayer <michaelni@gmx.at>2012-03-02 06:21:48 +0100
committerMichael Niedermayer <michaelni@gmx.at>2012-03-02 16:00:21 +0100
commita5bf9b351cc0db2b95cc199e30f2ec7325009c3a (patch)
treeff33d4b2afbbad31eb2cd40f25d22ad189a46200 /libavdevice
parentec3cd74f2dab8e3e8234ccb994132b23d3098585 (diff)
downloadffmpeg-a5bf9b351cc0db2b95cc199e30f2ec7325009c3a.tar.gz
timefilter: better selftest code.
Add support for divergence detection and variable period. Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Diffstat (limited to 'libavdevice')
-rw-r--r--libavdevice/timefilter.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/libavdevice/timefilter.c b/libavdevice/timefilter.c
index ff6552f7d7..e225ed11a9 100644
--- a/libavdevice/timefilter.c
+++ b/libavdevice/timefilter.c
@@ -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);