[FFmpeg-cvslog] avfilter/af_astats: measure minimal and mean difference between two consecutive samples
Paul B Mahol
git at videolan.org
Fri Jul 17 11:36:02 CEST 2015
ffmpeg | branch: master | Paul B Mahol <onemda at gmail.com> | Fri Jul 17 09:30:03 2015 +0000| [3b365dda5cd5e0db394d807bf904403bde4f4bc8] | committer: Paul B Mahol
avfilter/af_astats: measure minimal and mean difference between two consecutive samples
Signed-off-by: Paul B Mahol <onemda at gmail.com>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=3b365dda5cd5e0db394d807bf904403bde4f4bc8
---
doc/filters.texi | 11 +++++++++++
libavfilter/af_astats.c | 25 +++++++++++++++++++++----
2 files changed, 32 insertions(+), 4 deletions(-)
diff --git a/doc/filters.texi b/doc/filters.texi
index 3b4ec2c..49fab59 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -952,7 +952,9 @@ Available keys for each channel are:
DC_offset
Min_level
Max_level
+Min_difference
Max_difference
+Mean_difference
Peak_level
RMS_peak
RMS_trough
@@ -965,7 +967,9 @@ and for Overall:
DC_offset
Min_level
Max_level
+Min_difference
Max_difference
+Mean_difference
Peak_level
RMS_level
RMS_peak
@@ -997,9 +1001,16 @@ Minimal sample level.
@item Max level
Maximal sample level.
+ at item Min difference
+Minimal difference between two consecutive samples.
+
@item Max difference
Maximal difference between two consecutive samples.
+ at item Mean difference
+Mean difference between two consecutive samples.
+The average of each difference between two consecutive samples.
+
@item Peak level dB
@item RMS level dB
Standard peak and RMS level measured in dBFS.
diff --git a/libavfilter/af_astats.c b/libavfilter/af_astats.c
index 0e8c3e2..e38d66b 100644
--- a/libavfilter/af_astats.c
+++ b/libavfilter/af_astats.c
@@ -33,7 +33,8 @@ typedef struct ChannelStats {
double min, max;
double min_run, max_run;
double min_runs, max_runs;
- double max_diff;
+ double min_diff, max_diff;
+ double diff1_sum;
uint64_t mask;
uint64_t min_count, max_count;
uint64_t nb_samples;
@@ -104,7 +105,7 @@ static void reset_stats(AudioStatsContext *s)
p->min = p->min_sigma_x2 = DBL_MAX;
p->max = p->max_sigma_x2 = DBL_MIN;
- p->max_diff = -1;
+ p->min_diff = p->max_diff = -1;
}
}
@@ -162,7 +163,9 @@ static inline void update_stat(AudioStatsContext *s, ChannelStats *p, double d)
p->sigma_x += d;
p->sigma_x2 += d * d;
p->avg_sigma_x2 = p->avg_sigma_x2 * s->mult + (1.0 - s->mult) * d * d;
+ p->min_diff = FFMIN(p->min_diff == -1 ? DBL_MAX : p->min_diff, FFABS(d - (p->min_diff == -1 ? DBL_MAX : p->last)));
p->max_diff = FFMAX(p->max_diff, FFABS(d - (p->max_diff == -1 ? d : p->last)));
+ p->diff1_sum += FFABS(d - p->last);
p->last = d;
p->mask |= llrint(d * (1LLU<<63));
@@ -193,8 +196,9 @@ static void set_metadata(AudioStatsContext *s, AVDictionary **metadata)
{
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_diff = 0,
+ min = DBL_MAX, max = DBL_MIN, min_diff = DBL_MAX, max_diff = 0,
max_sigma_x = 0,
+ diff1_sum = 0,
sigma_x = 0,
sigma_x2 = 0,
min_sigma_x2 = DBL_MAX,
@@ -209,7 +213,9 @@ static void set_metadata(AudioStatsContext *s, AVDictionary **metadata)
min = FFMIN(min, p->min);
max = FFMAX(max, p->max);
+ min_diff = FFMIN(min_diff, p->min_diff);
max_diff = FFMAX(max_diff, p->max_diff);
+ diff1_sum += p->diff1_sum,
min_sigma_x2 = FFMIN(min_sigma_x2, p->min_sigma_x2);
max_sigma_x2 = FFMAX(max_sigma_x2, p->max_sigma_x2);
sigma_x += p->sigma_x;
@@ -226,7 +232,9 @@ static void set_metadata(AudioStatsContext *s, AVDictionary **metadata)
set_meta(metadata, c + 1, "DC_offset", "%f", p->sigma_x / p->nb_samples);
set_meta(metadata, c + 1, "Min_level", "%f", p->min);
set_meta(metadata, c + 1, "Max_level", "%f", p->max);
+ set_meta(metadata, c + 1, "Min_difference", "%f", p->min_diff);
set_meta(metadata, c + 1, "Max_difference", "%f", p->max_diff);
+ set_meta(metadata, c + 1, "Mean_difference", "%f", p->diff1_sum / (p->nb_samples - 1));
set_meta(metadata, c + 1, "Peak_level", "%f", LINEAR_TO_DB(FFMAX(-p->min, p->max)));
set_meta(metadata, c + 1, "RMS_level", "%f", LINEAR_TO_DB(sqrt(p->sigma_x2 / p->nb_samples)));
set_meta(metadata, c + 1, "RMS_peak", "%f", LINEAR_TO_DB(sqrt(p->max_sigma_x2)));
@@ -240,7 +248,9 @@ static void set_metadata(AudioStatsContext *s, AVDictionary **metadata)
set_meta(metadata, 0, "Overall.DC_offset", "%f", max_sigma_x / (nb_samples / s->nb_channels));
set_meta(metadata, 0, "Overall.Min_level", "%f", min);
set_meta(metadata, 0, "Overall.Max_level", "%f", max);
+ set_meta(metadata, 0, "Overall.Min_difference", "%f", min_diff);
set_meta(metadata, 0, "Overall.Max_difference", "%f", max_diff);
+ set_meta(metadata, 0, "Overall.Mean_difference", "%f", diff1_sum / (nb_samples - s->nb_channels));
set_meta(metadata, 0, "Overall.Peak_level", "%f", LINEAR_TO_DB(FFMAX(-min, max)));
set_meta(metadata, 0, "Overall.RMS_level", "%f", LINEAR_TO_DB(sqrt(sigma_x2 / nb_samples)));
set_meta(metadata, 0, "Overall.RMS_peak", "%f", LINEAR_TO_DB(sqrt(max_sigma_x2)));
@@ -298,8 +308,9 @@ static void print_stats(AVFilterContext *ctx)
AudioStatsContext *s = ctx->priv;
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_diff = 0,
+ min = DBL_MAX, max = DBL_MIN, min_diff = DBL_MAX, max_diff = 0,
max_sigma_x = 0,
+ diff1_sum = 0,
sigma_x = 0,
sigma_x2 = 0,
min_sigma_x2 = DBL_MAX,
@@ -314,7 +325,9 @@ static void print_stats(AVFilterContext *ctx)
min = FFMIN(min, p->min);
max = FFMAX(max, p->max);
+ min_diff = FFMIN(min_diff, p->min_diff);
max_diff = FFMAX(max_diff, p->max_diff);
+ diff1_sum += p->diff1_sum,
min_sigma_x2 = FFMIN(min_sigma_x2, p->min_sigma_x2);
max_sigma_x2 = FFMAX(max_sigma_x2, p->max_sigma_x2);
sigma_x += p->sigma_x;
@@ -332,7 +345,9 @@ static void print_stats(AVFilterContext *ctx)
av_log(ctx, AV_LOG_INFO, "DC offset: %f\n", p->sigma_x / p->nb_samples);
av_log(ctx, AV_LOG_INFO, "Min level: %f\n", p->min);
av_log(ctx, AV_LOG_INFO, "Max level: %f\n", p->max);
+ av_log(ctx, AV_LOG_INFO, "Min difference: %f\n", p->min_diff);
av_log(ctx, AV_LOG_INFO, "Max difference: %f\n", p->max_diff);
+ av_log(ctx, AV_LOG_INFO, "Mean difference: %f\n", p->diff1_sum / (p->nb_samples - 1));
av_log(ctx, AV_LOG_INFO, "Peak level dB: %f\n", LINEAR_TO_DB(FFMAX(-p->min, p->max)));
av_log(ctx, AV_LOG_INFO, "RMS level dB: %f\n", LINEAR_TO_DB(sqrt(p->sigma_x2 / p->nb_samples)));
av_log(ctx, AV_LOG_INFO, "RMS peak dB: %f\n", LINEAR_TO_DB(sqrt(p->max_sigma_x2)));
@@ -348,7 +363,9 @@ static void print_stats(AVFilterContext *ctx)
av_log(ctx, AV_LOG_INFO, "DC offset: %f\n", max_sigma_x / (nb_samples / s->nb_channels));
av_log(ctx, AV_LOG_INFO, "Min level: %f\n", min);
av_log(ctx, AV_LOG_INFO, "Max level: %f\n", max);
+ av_log(ctx, AV_LOG_INFO, "Min difference: %f\n", min_diff);
av_log(ctx, AV_LOG_INFO, "Max difference: %f\n", max_diff);
+ av_log(ctx, AV_LOG_INFO, "Mean difference: %f\n", diff1_sum / (nb_samples - s->nb_channels));
av_log(ctx, AV_LOG_INFO, "Peak level dB: %f\n", LINEAR_TO_DB(FFMAX(-min, max)));
av_log(ctx, AV_LOG_INFO, "RMS level dB: %f\n", LINEAR_TO_DB(sqrt(sigma_x2 / nb_samples)));
av_log(ctx, AV_LOG_INFO, "RMS peak dB: %f\n", LINEAR_TO_DB(sqrt(max_sigma_x2)));
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