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avfilter/af_astats: count zero crossings

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This commit is contained in:
Paul B Mahol 2018-09-12 14:54:22 +02:00
parent acc9684dcd
commit c4774c5474
1 changed files with 12 additions and 0 deletions
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12
libavfilter/af_astats.c
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@ -28,6 +28,7 @@
typedef struct ChannelStats {
double last;
double last_non_zero;
double min_non_zero;
double sigma_x, sigma_x2;
double avg_sigma_x2, min_sigma_x2, max_sigma_x2;
@ -40,6 +41,7 @@ typedef struct ChannelStats {
double diff1_sum_x2;
uint64_t mask, imask;
uint64_t min_count, max_count;
uint64_t zero_runs;
uint64_t nb_samples;
} ChannelStats;
@ -127,6 +129,7 @@ static void reset_stats(AudioStatsContext *s)
p->imask = 0xFFFFFFFFFFFFFFFF;
p->min_count = 0;
p->max_count = 0;
p->zero_runs = 0;
p->nb_samples = 0;
}
}
@ -196,6 +199,11 @@ static inline void update_stat(AudioStatsContext *s, ChannelStats *p, double d,
p->max_runs += p->max_run * p->max_run;
}
if (d != 0) {
p->zero_runs += FFSIGN(d) != FFSIGN(p->last_non_zero);
p->last_non_zero = d;
}
p->sigma_x += nd;
p->sigma_x2 += nd * nd;
p->avg_sigma_x2 = p->avg_sigma_x2 * s->mult + (1.0 - s->mult) * nd * nd;
@ -292,6 +300,8 @@ static void set_metadata(AudioStatsContext *s, AVDictionary **metadata)
set_meta(metadata, c + 1, "Bit_depth", "%f", depth.num);
set_meta(metadata, c + 1, "Bit_depth2", "%f", depth.den);
set_meta(metadata, c + 1, "Dynamic_range", "%f", LINEAR_TO_DB(2 * FFMAX(FFABS(p->min), FFABS(p->max))/ p->min_non_zero));
set_meta(metadata, c + 1, "Zero_crossings", "%f", p->zero_runs);
set_meta(metadata, c + 1, "Zero_crossings_rate", "%f", p->zero_runs/(double)p->nb_samples);
}
set_meta(metadata, 0, "Overall.DC_offset", "%f", max_sigma_x / (nb_samples / s->nb_channels));
@ -486,6 +496,8 @@ static void print_stats(AVFilterContext *ctx)
bit_depth(s, p->mask, p->imask, &depth);
av_log(ctx, AV_LOG_INFO, "Bit depth: %u/%u\n", depth.num, depth.den);
av_log(ctx, AV_LOG_INFO, "Dynamic range: %f\n", LINEAR_TO_DB(2 * FFMAX(FFABS(p->min), FFABS(p->max))/ p->min_non_zero));
av_log(ctx, AV_LOG_INFO, "Zero crossings: %"PRId64"\n", p->zero_runs);
av_log(ctx, AV_LOG_INFO, "Zero crossings rate: %f\n", p->zero_runs/(double)p->nb_samples);
}
av_log(ctx, AV_LOG_INFO, "Overall\n");