double time_constant;
double mult;
int metadata;
+ int reset_count;
+ int nb_frames;
} AudioStatsContext;
#define OFFSET(x) offsetof(AudioStatsContext, x)
static const AVOption astats_options[] = {
{ "length", "set the window length", OFFSET(time_constant), AV_OPT_TYPE_DOUBLE, {.dbl=.05}, .01, 10, FLAGS },
{ "metadata", "inject metadata in the filtergraph", OFFSET(metadata), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS },
+ { "reset", "recalculate stats after this many frames", OFFSET(reset_count), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, FLAGS },
{ NULL }
};
return ff_set_common_samplerates(ctx, formats);
}
+static void reset_stats(AudioStatsContext *s)
+{
+ int c;
+
+ memset(s->chstats, 0, sizeof(*s->chstats));
+
+ for (c = 0; c < s->nb_channels; c++) {
+ ChannelStats *p = &s->chstats[c];
+
+ p->min = p->min_sigma_x2 = DBL_MAX;
+ p->max = p->max_sigma_x2 = DBL_MIN;
+ }
+}
+
static int config_output(AVFilterLink *outlink)
{
AudioStatsContext *s = outlink->src->priv;
- int c;
s->chstats = av_calloc(sizeof(*s->chstats), outlink->channels);
if (!s->chstats)
s->mult = exp((-1 / s->time_constant / outlink->sample_rate));
s->tc_samples = 5 * s->time_constant * outlink->sample_rate + .5;
- for (c = 0; c < s->nb_channels; c++) {
- ChannelStats *p = &s->chstats[c];
-
- p->min = p->min_sigma_x2 = DBL_MAX;
- p->max = p->max_sigma_x2 = DBL_MIN;
- }
+ reset_stats(s);
return 0;
}
if (s->metadata)
set_metadata(s, metadata);
+ if (s->reset_count > 0) {
+ s->nb_frames++;
+ if (s->nb_frames >= s->reset_count) {
+ reset_stats(s);
+ s->nb_frames = 0;
+ }
+ }
+
return ff_filter_frame(inlink->dst->outputs[0], buf);
}