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avfilter/af_astats: count number of NaNs/Infs/denormals for floating-…
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…point audio too
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@richardpl
richardpl committed Apr 26, 2019
1 parent 0fc4646 commit 1e01f66
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Showing 2 changed files with 86 additions and 6 deletions.
6 changes: 6 additions & 0 deletions doc/filters.texi
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Expand Up @@ -2141,6 +2141,9 @@ Bit_depth
Dynamic_range
Zero_crossings
Zero_crossings_rate
Number_of_NaNs
Number_of_Infs
Number_of_denormals

and for Overall:
DC_offset
Expand All @@ -2158,6 +2161,9 @@ Flat_factor
Peak_count
Bit_depth
Number_of_samples
Number_of_NaNs
Number_of_Infs
Number_of_denormals

For example full key look like this @code{lavfi.astats.1.DC_offset} or
this @code{lavfi.astats.Overall.Peak_count}.
Expand Down
86 changes: 80 additions & 6 deletions libavfilter/af_astats.c
View file
Expand Up @@ -20,6 +20,7 @@
*/

#include <float.h>
#include <math.h>

#include "libavutil/opt.h"
#include "audio.h"
Expand Down Expand Up @@ -48,6 +49,9 @@
#define MEASURE_ZERO_CROSSINGS (1 << 16)
#define MEASURE_ZERO_CROSSINGS_RATE (1 << 17)
#define MEASURE_NUMBER_OF_SAMPLES (1 << 18)
#define MEASURE_NUMBER_OF_NANS (1 << 19)
#define MEASURE_NUMBER_OF_INFS (1 << 20)
#define MEASURE_NUMBER_OF_DENORMALS (1 << 21)

#define MEASURE_MINMAXPEAK (MEASURE_MIN_LEVEL | MEASURE_MAX_LEVEL | MEASURE_PEAK_LEVEL)

Expand All @@ -68,6 +72,9 @@ typedef struct ChannelStats {
uint64_t min_count, max_count;
uint64_t zero_runs;
uint64_t nb_samples;
uint64_t nb_nans;
uint64_t nb_infs;
uint64_t nb_denormals;
} ChannelStats;

typedef struct AudioStatsContext {
Expand All @@ -83,6 +90,8 @@ typedef struct AudioStatsContext {
int maxbitdepth;
int measure_perchannel;
int measure_overall;
int is_float;
int is_double;
} AudioStatsContext;

#define OFFSET(x) offsetof(AudioStatsContext, x)
Expand Down Expand Up @@ -114,6 +123,9 @@ static const AVOption astats_options[] = {
{ "Zero_crossings" , "", 0, AV_OPT_TYPE_CONST, {.i64=MEASURE_ZERO_CROSSINGS }, 0, 0, FLAGS, "measure" },
{ "Zero_crossings_rate" , "", 0, AV_OPT_TYPE_CONST, {.i64=MEASURE_ZERO_CROSSINGS_RATE }, 0, 0, FLAGS, "measure" },
{ "Number_of_samples" , "", 0, AV_OPT_TYPE_CONST, {.i64=MEASURE_NUMBER_OF_SAMPLES }, 0, 0, FLAGS, "measure" },
{ "Number_of_NaNs" , "", 0, AV_OPT_TYPE_CONST, {.i64=MEASURE_NUMBER_OF_NANS }, 0, 0, FLAGS, "measure" },
{ "Number_of_Infs" , "", 0, AV_OPT_TYPE_CONST, {.i64=MEASURE_NUMBER_OF_INFS }, 0, 0, FLAGS, "measure" },
{ "Number_of_denormals" , "", 0, AV_OPT_TYPE_CONST, {.i64=MEASURE_NUMBER_OF_DENORMALS }, 0, 0, FLAGS, "measure" },
{ "measure_overall", "only measure_perchannel these overall statistics", OFFSET(measure_overall), AV_OPT_TYPE_FLAGS, {.i64=MEASURE_ALL}, 0, UINT_MAX, FLAGS, "measure" },
{ NULL }
};
Expand Down Expand Up @@ -181,6 +193,9 @@ static void reset_stats(AudioStatsContext *s)
p->max_count = 0;
p->zero_runs = 0;
p->nb_samples = 0;
p->nb_nans = 0;
p->nb_infs = 0;
p->nb_denormals = 0;
}
}

Expand All @@ -196,6 +211,11 @@ static int config_output(AVFilterLink *outlink)
s->tc_samples = 5 * s->time_constant * outlink->sample_rate + .5;
s->nb_frames = 0;
s->maxbitdepth = av_get_bytes_per_sample(outlink->format) * 8;
s->is_double = outlink->format == AV_SAMPLE_FMT_DBL ||
outlink->format == AV_SAMPLE_FMT_DBLP;

s->is_float = outlink->format == AV_SAMPLE_FMT_FLT ||
outlink->format == AV_SAMPLE_FMT_FLTP;

reset_stats(s);

Expand Down Expand Up @@ -280,6 +300,24 @@ static inline void update_stat(AudioStatsContext *s, ChannelStats *p, double d,
p->nb_samples++;
}

static inline void update_float_stat(AudioStatsContext *s, ChannelStats *p, float d)
{
int type = fpclassify(d);

p->nb_nans += type == FP_NAN;
p->nb_infs += type == FP_INFINITE;
p->nb_denormals += type == FP_SUBNORMAL;
}

static inline void update_double_stat(AudioStatsContext *s, ChannelStats *p, double d)
{
int type = fpclassify(d);

p->nb_nans += type == FP_NAN;
p->nb_infs += type == FP_INFINITE;
p->nb_denormals += type == FP_SUBNORMAL;
}

static void set_meta(AVDictionary **metadata, int chan, const char *key,
const char *fmt, double val)
{
Expand All @@ -299,6 +337,7 @@ static void set_meta(AVDictionary **metadata, int chan, const char *key,
static void set_metadata(AudioStatsContext *s, AVDictionary **metadata)
{
uint64_t mask = 0, imask = 0xFFFFFFFFFFFFFFFF, min_count = 0, max_count = 0, nb_samples = 0;
uint64_t nb_nans = 0, nb_infs = 0, nb_denormals = 0;
double min_runs = 0, max_runs = 0,
min = DBL_MAX, max = DBL_MIN, min_diff = DBL_MAX, max_diff = 0,
nmin = DBL_MAX, nmax = DBL_MIN,
Expand Down Expand Up @@ -337,6 +376,9 @@ static void set_metadata(AudioStatsContext *s, AVDictionary **metadata)
mask |= p->mask;
imask &= p->imask;
nb_samples += p->nb_samples;
nb_nans += p->nb_nans;
nb_infs += p->nb_infs;
nb_denormals += p->nb_denormals;
if (fabs(p->sigma_x) > fabs(max_sigma_x))
max_sigma_x = p->sigma_x;

Expand Down Expand Up @@ -379,6 +421,12 @@ static void set_metadata(AudioStatsContext *s, AVDictionary **metadata)
set_meta(metadata, c + 1, "Zero_crossings", "%f", p->zero_runs);
if (s->measure_perchannel & MEASURE_ZERO_CROSSINGS_RATE)
set_meta(metadata, c + 1, "Zero_crossings_rate", "%f", p->zero_runs/(double)p->nb_samples);
if ((s->is_float || s->is_double) && s->measure_perchannel & MEASURE_NUMBER_OF_NANS)
set_meta(metadata, c + 1, "Number of NaNs", "%f", p->nb_nans);
if ((s->is_float || s->is_double) && s->measure_perchannel & MEASURE_NUMBER_OF_INFS)
set_meta(metadata, c + 1, "Number of Infs", "%f", p->nb_infs);
if ((s->is_float || s->is_double) && s->measure_perchannel & MEASURE_NUMBER_OF_DENORMALS)
set_meta(metadata, c + 1, "Number of denormals", "%f", p->nb_denormals);
}

if (s->measure_overall & MEASURE_DC_OFFSET)
Expand Down Expand Up @@ -414,33 +462,43 @@ static void set_metadata(AudioStatsContext *s, AVDictionary **metadata)
}
if (s->measure_overall & MEASURE_NUMBER_OF_SAMPLES)
set_meta(metadata, 0, "Overall.Number_of_samples", "%f", nb_samples / s->nb_channels);
if ((s->is_float || s->is_double) && s->measure_overall & MEASURE_NUMBER_OF_NANS)
set_meta(metadata, 0, "Number of NaNs", "%f", nb_nans / (float)s->nb_channels);
if ((s->is_float || s->is_double) && s->measure_overall & MEASURE_NUMBER_OF_INFS)
set_meta(metadata, 0, "Number of Infs", "%f", nb_infs / (float)s->nb_channels);
if ((s->is_float || s->is_double) && s->measure_overall & MEASURE_NUMBER_OF_DENORMALS)
set_meta(metadata, 0, "Number of denormals", "%f", nb_denormals / (float)s->nb_channels);
}

#define UPDATE_STATS_P(type, update_func, channel_func) \
#define UPDATE_STATS_P(type, update_func, update_float, channel_func) \
for (int c = 0; c < channels; c++) { \
ChannelStats *p = &s->chstats[c]; \
const type *src = (const type *)data[c]; \
const type * const srcend = src + samples; \
for (; src < srcend; src++) \
for (; src < srcend; src++) { \
update_func; \
update_float; \
} \
channel_func; \
}

#define UPDATE_STATS_I(type, update_func, channel_func) \
#define UPDATE_STATS_I(type, update_func, update_float, channel_func) \
for (int c = 0; c < channels; c++) { \
ChannelStats *p = &s->chstats[c]; \
const type *src = (const type *)data[0]; \
const type * const srcend = src + samples * channels; \
for (src += c; src < srcend; src += channels) \
for (src += c; src < srcend; src += channels) { \
update_func; \
update_float; \
} \
channel_func; \
}

#define UPDATE_STATS(planar, type, sample, normalizer_suffix, int_sample) \
if ((s->measure_overall | s->measure_perchannel) & ~MEASURE_MINMAXPEAK) { \
UPDATE_STATS_##planar(type, update_stat(s, p, sample, sample normalizer_suffix, int_sample), ); \
UPDATE_STATS_##planar(type, update_stat(s, p, sample, sample normalizer_suffix, int_sample), s->is_float ? update_float_stat(s, p, sample) : s->is_double ? update_double_stat(s, p, sample) : NULL, ); \
} else { \
UPDATE_STATS_##planar(type, update_minmax(s, p, sample), p->nmin = p->min normalizer_suffix; p->nmax = p->max normalizer_suffix;); \
UPDATE_STATS_##planar(type, update_minmax(s, p, sample), , p->nmin = p->min normalizer_suffix; p->nmax = p->max normalizer_suffix;); \
}

static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
Expand Down Expand Up @@ -502,6 +560,7 @@ static void print_stats(AVFilterContext *ctx)
{
AudioStatsContext *s = ctx->priv;
uint64_t mask = 0, imask = 0xFFFFFFFFFFFFFFFF, min_count = 0, max_count = 0, nb_samples = 0;
uint64_t nb_nans = 0, nb_infs = 0, nb_denormals = 0;
double min_runs = 0, max_runs = 0,
min = DBL_MAX, max = DBL_MIN, min_diff = DBL_MAX, max_diff = 0,
nmin = DBL_MAX, nmax = DBL_MIN,
Expand Down Expand Up @@ -540,6 +599,9 @@ static void print_stats(AVFilterContext *ctx)
mask |= p->mask;
imask &= p->imask;
nb_samples += p->nb_samples;
nb_nans += p->nb_nans;
nb_infs += p->nb_infs;
nb_denormals += p->nb_denormals;
if (fabs(p->sigma_x) > fabs(max_sigma_x))
max_sigma_x = p->sigma_x;

Expand Down Expand Up @@ -583,6 +645,12 @@ static void print_stats(AVFilterContext *ctx)
av_log(ctx, AV_LOG_INFO, "Zero crossings: %"PRId64"\n", p->zero_runs);
if (s->measure_perchannel & MEASURE_ZERO_CROSSINGS_RATE)
av_log(ctx, AV_LOG_INFO, "Zero crossings rate: %f\n", p->zero_runs/(double)p->nb_samples);
if ((s->is_float || s->is_double) && s->measure_perchannel & MEASURE_NUMBER_OF_NANS)
av_log(ctx, AV_LOG_INFO, "Number of NaNs: %"PRId64"\n", p->nb_nans);
if ((s->is_float || s->is_double) && s->measure_perchannel & MEASURE_NUMBER_OF_INFS)
av_log(ctx, AV_LOG_INFO, "Number of Infs: %"PRId64"\n", p->nb_infs);
if ((s->is_float || s->is_double) && s->measure_perchannel & MEASURE_NUMBER_OF_DENORMALS)
av_log(ctx, AV_LOG_INFO, "Number of denormals: %"PRId64"\n", p->nb_denormals);
}

av_log(ctx, AV_LOG_INFO, "Overall\n");
Expand Down Expand Up @@ -619,6 +687,12 @@ static void print_stats(AVFilterContext *ctx)
}
if (s->measure_overall & MEASURE_NUMBER_OF_SAMPLES)
av_log(ctx, AV_LOG_INFO, "Number of samples: %"PRId64"\n", nb_samples / s->nb_channels);
if ((s->is_float || s->is_double) && s->measure_overall & MEASURE_NUMBER_OF_NANS)
av_log(ctx, AV_LOG_INFO, "Number of NaNs: %f\n", nb_nans / (float)s->nb_channels);
if ((s->is_float || s->is_double) && s->measure_overall & MEASURE_NUMBER_OF_INFS)
av_log(ctx, AV_LOG_INFO, "Number of Infs: %f\n", nb_infs / (float)s->nb_channels);
if ((s->is_float || s->is_double) && s->measure_overall & MEASURE_NUMBER_OF_DENORMALS)
av_log(ctx, AV_LOG_INFO, "Number of denormals: %f\n", nb_denormals / (float)s->nb_channels);
}

static av_cold void uninit(AVFilterContext *ctx)
Expand Down

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