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avfilter/af_astats: calculate audio bit-depth 

Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2015-07-13 08:49:26 +00:00
parent 3001558487
commit 61641627b8
1 changed files with 19 additions and 2 deletions
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21
libavfilter/af_astats.c
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@ -33,6 +33,7 @@ typedef struct ChannelStats {
double min, max;
double min_run, max_run;
double min_runs, max_runs;
uint64_t mask;
uint64_t min_count, max_count;
uint64_t nb_samples;
} ChannelStats;
@ -121,6 +122,15 @@ static int config_output(AVFilterLink *outlink)
return 0;
}
static unsigned bit_depth(uint64_t mask)
{
unsigned result = 64;
for (; result && !(mask & 1); --result, mask >>= 1);
return result;
}
static inline void update_stat(AudioStatsContext *s, ChannelStats *p, double d)
{
if (d < p->min) {
@ -151,6 +161,7 @@ static inline void update_stat(AudioStatsContext *s, ChannelStats *p, double d)
p->sigma_x2 += d * d;
p->avg_sigma_x2 = p->avg_sigma_x2 * s->mult + (1.0 - s->mult) * d * d;
p->last = d;
p->mask |= llrint(d * (1LLU<<63));
if (p->nb_samples >= s->tc_samples) {
p->max_sigma_x2 = FFMAX(p->max_sigma_x2, p->avg_sigma_x2);
@ -177,7 +188,7 @@ static void set_meta(AVDictionary **metadata, int chan, const char *key,
static void set_metadata(AudioStatsContext *s, AVDictionary **metadata)
{
uint64_t min_count = 0, max_count = 0, nb_samples = 0;
uint64_t mask = 0, min_count = 0, max_count = 0, nb_samples = 0;
double min_runs = 0, max_runs = 0,
min = DBL_MAX, max = DBL_MIN,
max_sigma_x = 0,
@ -203,6 +214,7 @@ static void set_metadata(AudioStatsContext *s, AVDictionary **metadata)
max_count += p->max_count;
min_runs += p->min_runs;
max_runs += p->max_runs;
mask |= p->mask;
nb_samples += p->nb_samples;
if (fabs(p->sigma_x) > fabs(max_sigma_x))
max_sigma_x = p->sigma_x;
@ -217,6 +229,7 @@ static void set_metadata(AudioStatsContext *s, AVDictionary **metadata)
set_meta(metadata, c + 1, "Crest_factor", "%f", p->sigma_x2 ? FFMAX(-p->min, p->max) / sqrt(p->sigma_x2 / p->nb_samples) : 1);
set_meta(metadata, c + 1, "Flat_factor", "%f", LINEAR_TO_DB((p->min_runs + p->max_runs) / (p->min_count + p->max_count)));
set_meta(metadata, c + 1, "Peak_count", "%f", (float)(p->min_count + p->max_count));
set_meta(metadata, c + 1, "Bit_depth", "%f", bit_depth(p->mask));
}
set_meta(metadata, 0, "Overall.DC_offset", "%f", max_sigma_x / (nb_samples / s->nb_channels));
@ -228,6 +241,7 @@ static void set_metadata(AudioStatsContext *s, AVDictionary **metadata)
set_meta(metadata, 0, "Overall.RMS_trough", "%f", LINEAR_TO_DB(sqrt(min_sigma_x2)));
set_meta(metadata, 0, "Overall.Flat_factor", "%f", LINEAR_TO_DB((min_runs + max_runs) / (min_count + max_count)));
set_meta(metadata, 0, "Overall.Peak_count", "%f", (float)(min_count + max_count) / (double)s->nb_channels);
set_meta(metadata, 0, "Overall.Bit_depth", "%f", bit_depth(mask));
set_meta(metadata, 0, "Overall.Number_of_samples", "%f", nb_samples / s->nb_channels);
}
@ -276,7 +290,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
static void print_stats(AVFilterContext *ctx)
{
AudioStatsContext *s = ctx->priv;
uint64_t min_count = 0, max_count = 0, nb_samples = 0;
uint64_t mask = 0, min_count = 0, max_count = 0, nb_samples = 0;
double min_runs = 0, max_runs = 0,
min = DBL_MAX, max = DBL_MIN,
max_sigma_x = 0,
@ -302,6 +316,7 @@ static void print_stats(AVFilterContext *ctx)
max_count += p->max_count;
min_runs += p->min_runs;
max_runs += p->max_runs;
mask |= p->mask;
nb_samples += p->nb_samples;
if (fabs(p->sigma_x) > fabs(max_sigma_x))
max_sigma_x = p->sigma_x;
@ -318,6 +333,7 @@ static void print_stats(AVFilterContext *ctx)
av_log(ctx, AV_LOG_INFO, "Crest factor: %f\n", p->sigma_x2 ? FFMAX(-p->min, p->max) / sqrt(p->sigma_x2 / p->nb_samples) : 1);
av_log(ctx, AV_LOG_INFO, "Flat factor: %f\n", LINEAR_TO_DB((p->min_runs + p->max_runs) / (p->min_count + p->max_count)));
av_log(ctx, AV_LOG_INFO, "Peak count: %"PRId64"\n", p->min_count + p->max_count);
av_log(ctx, AV_LOG_INFO, "Bit depth: %u\n", bit_depth(p->mask));
}
av_log(ctx, AV_LOG_INFO, "Overall\n");
@ -331,6 +347,7 @@ static void print_stats(AVFilterContext *ctx)
av_log(ctx, AV_LOG_INFO, "RMS trough dB: %f\n", LINEAR_TO_DB(sqrt(min_sigma_x2)));
av_log(ctx, AV_LOG_INFO, "Flat factor: %f\n", LINEAR_TO_DB((min_runs + max_runs) / (min_count + max_count)));
av_log(ctx, AV_LOG_INFO, "Peak count: %f\n", (min_count + max_count) / (double)s->nb_channels);
av_log(ctx, AV_LOG_INFO, "Bit depth: %u\n", bit_depth(mask));
av_log(ctx, AV_LOG_INFO, "Number of samples: %"PRId64"\n", nb_samples / s->nb_channels);
}