av_cold int ff_alsa_close(AVFormatContext *s1)
{
AlsaData *s = s1->priv_data;
av_freep(&s->reorder_buf);
if (CONFIG_ALSA_INDEV)
ff_timefilter_destroy(s->timefilter);
snd_pcm_close(s->h);
return 0;
}
static void stop_jack(JackData *self)
{
if (self->client) {
if (self->activated)
jack_deactivate(self->client);
jack_client_close(self->client);
}
sem_destroy(&self->packet_count);
free_pkt_fifo(self->new_pkts);
free_pkt_fifo(self->filled_pkts);
av_freep(&self->ports);
ff_timefilter_destroy(self->timefilter);
}
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;
av_lfg_init(&prng, 123);
for(i=0; i<SAMPLES; i++){
ideal[i] = 10 + i + n1*i/(1000);
samples[i] = ideal[i] + n0 * (av_lfg_get(&prng) - LFG_MAX / 2)
/ (LFG_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(1, 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);
#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");
}
return 0;
}
