[FFmpeg-cvslog] avfilter/af_astats: also measure maximal difference between two consecutive samples
Paul B Mahol
git at videolan.org
Thu Jul 16 16:59:24 CEST 2015
ffmpeg | branch: master | Paul B Mahol <onemda at gmail.com> | Wed Jul 15 19:00:25 2015 +0000| [59a9998908d89a88f05409b441a4be04c3327fdd] | committer: Paul B Mahol
avfilter/af_astats: also measure maximal difference between two consecutive samples
While here also mention bit depth in documentation.
Signed-off-by: Paul B Mahol <onemda at gmail.com>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=59a9998908d89a88f05409b441a4be04c3327fdd
---
doc/filters.texi | 13 +++++++++++++
libavfilter/af_astats.c | 12 ++++++++++--
2 files changed, 23 insertions(+), 2 deletions(-)
diff --git a/doc/filters.texi b/doc/filters.texi
index 2679090..3b4ec2c 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -952,23 +952,27 @@ Available keys for each channel are:
DC_offset
Min_level
Max_level
+Max_difference
Peak_level
RMS_peak
RMS_trough
Crest_factor
Flat_factor
Peak_count
+Bit_depth
and for Overall:
DC_offset
Min_level
Max_level
+Max_difference
Peak_level
RMS_level
RMS_peak
RMS_trough
Flat_factor
Peak_count
+Bit_depth
Number_of_samples
For example full key look like this @code{lavfi.astats.1.DC_offset} or
@@ -976,6 +980,9 @@ this @code{lavfi.astats.Overall.Peak_count}.
For description what each key means read bellow.
+ at item reset
+Set number of frame after which stats are going to be recalculated.
+Default is disabled.
@end table
A description of each shown parameter follows:
@@ -990,6 +997,9 @@ Minimal sample level.
@item Max level
Maximal sample level.
+ at item Max difference
+Maximal difference between two consecutive samples.
+
@item Peak level dB
@item RMS level dB
Standard peak and RMS level measured in dBFS.
@@ -1008,6 +1018,9 @@ Flatness (i.e. consecutive samples with the same value) of the signal at its pea
@item Peak count
Number of occasions (not the number of samples) that the signal attained either
@var{Min level} or @var{Max level}.
+
+ at item Bit depth
+Overall bit depth of audio. Number of bits used for each sample.
@end table
@section astreamsync
diff --git a/libavfilter/af_astats.c b/libavfilter/af_astats.c
index 1f67014..81cede1 100644
--- a/libavfilter/af_astats.c
+++ b/libavfilter/af_astats.c
@@ -33,6 +33,7 @@ typedef struct ChannelStats {
double min, max;
double min_run, max_run;
double min_runs, max_runs;
+ double max_diff;
uint64_t mask;
uint64_t min_count, max_count;
uint64_t nb_samples;
@@ -160,6 +161,7 @@ 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->max_diff = FFMAX(p->max_diff, FFABS(d - p->last));
p->last = d;
p->mask |= llrint(d * (1LLU<<63));
@@ -190,7 +192,7 @@ 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,
+ min = DBL_MAX, max = DBL_MIN, max_diff = 0,
max_sigma_x = 0,
sigma_x = 0,
sigma_x2 = 0,
@@ -206,6 +208,7 @@ static void set_metadata(AudioStatsContext *s, AVDictionary **metadata)
min = FFMIN(min, p->min);
max = FFMAX(max, p->max);
+ max_diff = FFMAX(max_diff, p->max_diff);
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;
@@ -222,6 +225,7 @@ 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, "Max_difference", "%f", p->max_diff);
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)));
@@ -235,6 +239,7 @@ 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.Max_difference", "%f", max_diff);
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)));
@@ -292,7 +297,7 @@ 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,
+ min = DBL_MAX, max = DBL_MIN, max_diff = 0,
max_sigma_x = 0,
sigma_x = 0,
sigma_x2 = 0,
@@ -308,6 +313,7 @@ static void print_stats(AVFilterContext *ctx)
min = FFMIN(min, p->min);
max = FFMAX(max, p->max);
+ max_diff = FFMAX(max_diff, p->max_diff);
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;
@@ -325,6 +331,7 @@ 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, "Max difference: %f\n", p->max_diff);
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)));
@@ -340,6 +347,7 @@ 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, "Max difference: %f\n", max_diff);
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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