#include <float.h>
#include <math.h>
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/tx.h"
#include "audio.h"
#include "avfilter.h"
#include "filters.h"
#include "window_func.h"

Data Structures
struct	ChannelSpectralStats

struct	AudioSpectralStatsContext

Macros
#define	MEASURE_ALL UINT_MAX

#define	MEASURE_NONE 0

#define	MEASURE_MEAN (1 << 0)

#define	MEASURE_VARIANCE (1 << 1)

#define	MEASURE_CENTROID (1 << 2)

#define	MEASURE_SPREAD (1 << 3)

#define	MEASURE_SKEWNESS (1 << 4)

#define	MEASURE_KURTOSIS (1 << 5)

#define	MEASURE_ENTROPY (1 << 6)

#define	MEASURE_FLATNESS (1 << 7)

#define	MEASURE_CREST (1 << 8)

#define	MEASURE_FLUX (1 << 9)

#define	MEASURE_SLOPE (1 << 10)

#define	MEASURE_DECREASE (1 << 11)

#define	MEASURE_ROLLOFF (1 << 12)

#define	OFFSET(x) offsetof(AudioSpectralStatsContext, x)

#define	A AV_OPT_FLAG_AUDIO_PARAM\|AV_OPT_FLAG_FILTERING_PARAM

Functions
	AVFILTER_DEFINE_CLASS (aspectralstats)

static int	config_output (AVFilterLink *outlink)

static void	set_meta (AVDictionary *metadata, int chan, const char key, const char *fmt, float val)

static void	set_metadata (AudioSpectralStatsContext s, AVDictionary *metadata)

static float	spectral_mean (const float *const spectral, int size, int max_freq)

static float	sqrf (float a)

static float	spectral_variance (const float *const spectral, int size, int max_freq, float mean)

static float	spectral_centroid (const float *const spectral, int size, int max_freq)

static float	spectral_spread (const float *const spectral, int size, int max_freq, float centroid)

static float	cbrf (float a)

static float	spectral_skewness (const float *const spectral, int size, int max_freq, float centroid, float spread)

static float	spectral_kurtosis (const float *const spectral, int size, int max_freq, float centroid, float spread)

static float	spectral_entropy (const float *const spectral, int size, int max_freq)

static float	spectral_flatness (const float *const spectral, int size, int max_freq)

static float	spectral_crest (const float *const spectral, int size, int max_freq)

static float	spectral_flux (const float const spectral, const float const prev_spectral, int size, int max_freq)

static float	spectral_slope (const float *const spectral, int size, int max_freq)

static float	spectral_decrease (const float *const spectral, int size, int max_freq)

static float	spectral_rolloff (const float *const spectral, int size, int max_freq)

static int	filter_channel (AVFilterContext ctx, void arg, int jobnr, int nb_jobs)

static int	filter_frame (AVFilterLink inlink, AVFrame in)

static int	activate (AVFilterContext *ctx)

static av_cold void	uninit (AVFilterContext *ctx)

Variables
static const AVOption	aspectralstats_options []

static const AVFilterPad	aspectralstats_outputs []

const AVFilter	ff_af_aspectralstats

Macro Definition Documentation

◆ MEASURE_ALL

#define MEASURE_ALL UINT_MAX

Definition at line 32 of file af_aspectralstats.c.

◆ MEASURE_NONE

#define MEASURE_NONE 0

Definition at line 33 of file af_aspectralstats.c.

◆ MEASURE_MEAN

#define MEASURE_MEAN (1 << 0)

Definition at line 34 of file af_aspectralstats.c.

◆ MEASURE_VARIANCE

#define MEASURE_VARIANCE (1 << 1)

Definition at line 35 of file af_aspectralstats.c.

◆ MEASURE_CENTROID

#define MEASURE_CENTROID (1 << 2)

Definition at line 36 of file af_aspectralstats.c.

◆ MEASURE_SPREAD

#define MEASURE_SPREAD (1 << 3)

Definition at line 37 of file af_aspectralstats.c.

◆ MEASURE_SKEWNESS

#define MEASURE_SKEWNESS (1 << 4)

Definition at line 38 of file af_aspectralstats.c.

◆ MEASURE_KURTOSIS

#define MEASURE_KURTOSIS (1 << 5)

Definition at line 39 of file af_aspectralstats.c.

◆ MEASURE_ENTROPY

#define MEASURE_ENTROPY (1 << 6)

Definition at line 40 of file af_aspectralstats.c.

◆ MEASURE_FLATNESS

#define MEASURE_FLATNESS (1 << 7)

Definition at line 41 of file af_aspectralstats.c.

◆ MEASURE_CREST

#define MEASURE_CREST (1 << 8)

Definition at line 42 of file af_aspectralstats.c.

◆ MEASURE_FLUX

#define MEASURE_FLUX (1 << 9)

Definition at line 43 of file af_aspectralstats.c.

◆ MEASURE_SLOPE

#define MEASURE_SLOPE (1 << 10)

Definition at line 44 of file af_aspectralstats.c.

◆ MEASURE_DECREASE

#define MEASURE_DECREASE (1 << 11)

Definition at line 45 of file af_aspectralstats.c.

◆ MEASURE_ROLLOFF

#define MEASURE_ROLLOFF (1 << 12)

Definition at line 46 of file af_aspectralstats.c.

◆ OFFSET

#define OFFSET ( x ) offsetof(AudioSpectralStatsContext, x)

Definition at line 83 of file af_aspectralstats.c.

◆ A

#define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 84 of file af_aspectralstats.c.

Function Documentation

◆ AVFILTER_DEFINE_CLASS()

AVFILTER_DEFINE_CLASS ( aspectralstats )

◆ config_output()

static int config_output ( AVFilterLink * outlink )

static

Definition at line 111 of file af_aspectralstats.c.

◆ set_meta()

static void set_meta	(	AVDictionary **	metadata,
		int	chan,
		const char *	key,
		const char *	fmt,
		float	val
	)

static

Definition at line 183 of file af_aspectralstats.c.

Referenced by do_vif(), and set_metadata().

◆ set_metadata()

static void set_metadata	(	AudioSpectralStatsContext *	s,
		AVDictionary **	metadata
	)

static

Definition at line 197 of file af_aspectralstats.c.

Referenced by filter_frame().

◆ spectral_mean()

static float spectral_mean	(	const float *const	spectral,
		int	size,
		int	max_freq
	)

static

Definition at line 231 of file af_aspectralstats.c.

Referenced by filter_channel().

◆ sqrf()

static float sqrf ( float a )

static

Definition at line 241 of file af_aspectralstats.c.

Referenced by spectral_flux(), spectral_kurtosis(), spectral_slope(), spectral_spread(), and spectral_variance().

◆ spectral_variance()

static float spectral_variance	(	const float *const	spectral,
		int	size,
		int	max_freq,
		float	mean
	)

static

Definition at line 246 of file af_aspectralstats.c.

Referenced by filter_channel().

◆ spectral_centroid()

static float spectral_centroid	(	const float *const	spectral,
		int	size,
		int	max_freq
	)

static

Definition at line 256 of file af_aspectralstats.c.

Referenced by filter_channel().

◆ spectral_spread()

static float spectral_spread	(	const float *const	spectral,
		int	size,
		int	max_freq,
		float	centroid
	)

static

Definition at line 271 of file af_aspectralstats.c.

Referenced by filter_channel().

◆ cbrf()

static float cbrf ( float a )

static

Definition at line 286 of file af_aspectralstats.c.

Referenced by spectral_skewness().

◆ spectral_skewness()

static float spectral_skewness	(	const float *const	spectral,
		int	size,
		int	max_freq,
		float	centroid,
		float	spread
	)

static

Definition at line 291 of file af_aspectralstats.c.

Referenced by filter_channel().

◆ spectral_kurtosis()

static float spectral_kurtosis	(	const float *const	spectral,
		int	size,
		int	max_freq,
		float	centroid,
		float	spread
	)

static

Definition at line 307 of file af_aspectralstats.c.

Referenced by filter_channel().

◆ spectral_entropy()

static float spectral_entropy	(	const float *const	spectral,
		int	size,
		int	max_freq
	)

static

Definition at line 323 of file af_aspectralstats.c.

Referenced by filter_channel().

◆ spectral_flatness()

static float spectral_flatness	(	const float *const	spectral,
		int	size,
		int	max_freq
	)

static

Definition at line 337 of file af_aspectralstats.c.

Referenced by filter_channel().

◆ spectral_crest()

static float spectral_crest	(	const float *const	spectral,
		int	size,
		int	max_freq
	)

static

Definition at line 355 of file af_aspectralstats.c.

Referenced by filter_channel().

◆ spectral_flux()

static float spectral_flux	(	const float *const	spectral,
		const float *const	prev_spectral,
		int	size,
		int	max_freq
	)

static

Definition at line 370 of file af_aspectralstats.c.

Referenced by filter_channel().

◆ spectral_slope()

static float spectral_slope	(	const float *const	spectral,
		int	size,
		int	max_freq
	)

static

Definition at line 381 of file af_aspectralstats.c.

Referenced by filter_channel().

◆ spectral_decrease()

static float spectral_decrease	(	const float *const	spectral,
		int	size,
		int	max_freq
	)

static

Definition at line 400 of file af_aspectralstats.c.

Referenced by filter_channel().

◆ spectral_rolloff()

static float spectral_rolloff	(	const float *const	spectral,
		int	size,
		int	max_freq
	)

static

Definition at line 414 of file af_aspectralstats.c.

Referenced by filter_channel().

◆ filter_channel()

static int filter_channel	(	AVFilterContext *	ctx,
		void *	arg,
		int	jobnr,
		int	nb_jobs
	)

static

Definition at line 435 of file af_aspectralstats.c.

Referenced by filter_frame().

◆ filter_frame()

static int filter_frame	(	AVFilterLink *	inlink,
		AVFrame *	in
	)

static

Definition at line 506 of file af_aspectralstats.c.

Referenced by activate().

◆ activate()

static int activate ( AVFilterContext * ctx )

static

Definition at line 546 of file af_aspectralstats.c.

◆ uninit()

static av_cold void uninit ( AVFilterContext * ctx )

static

Definition at line 575 of file af_aspectralstats.c.

Variable Documentation

◆ aspectralstats_options

const AVOption aspectralstats_options[]

static

Initial value:

= {
    { "win_size", "set the window size", OFFSET(win_size), AV_OPT_TYPE_INT, {.i64=2048}, 32, 65536, A },
    WIN_FUNC_OPTION("win_func", OFFSET(win_func), A, WFUNC_HANNING),
    { "overlap", "set window overlap", OFFSET(overlap), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, 0,  1, A },
    { "measure", "select the parameters which are measured", OFFSET(measure), AV_OPT_TYPE_FLAGS, {.i64=MEASURE_ALL}, 0, UINT_MAX, A, .unit = "measure" },
    { "none",     "", 0, AV_OPT_TYPE_CONST, {.i64=MEASURE_NONE    }, 0, 0, A, .unit = "measure" },
    { "all",      "", 0, AV_OPT_TYPE_CONST, {.i64=MEASURE_ALL     }, 0, 0, A, .unit = "measure" },
    { "mean",     "", 0, AV_OPT_TYPE_CONST, {.i64=MEASURE_MEAN    }, 0, 0, A, .unit = "measure" },
    { "variance", "", 0, AV_OPT_TYPE_CONST, {.i64=MEASURE_VARIANCE}, 0, 0, A, .unit = "measure" },
    { "centroid", "", 0, AV_OPT_TYPE_CONST, {.i64=MEASURE_CENTROID}, 0, 0, A, .unit = "measure" },
    { "spread",   "", 0, AV_OPT_TYPE_CONST, {.i64=MEASURE_SPREAD  }, 0, 0, A, .unit = "measure" },
    { "skewness", "", 0, AV_OPT_TYPE_CONST, {.i64=MEASURE_SKEWNESS}, 0, 0, A, .unit = "measure" },
    { "kurtosis", "", 0, AV_OPT_TYPE_CONST, {.i64=MEASURE_KURTOSIS}, 0, 0, A, .unit = "measure" },
    { "entropy",  "", 0, AV_OPT_TYPE_CONST, {.i64=MEASURE_ENTROPY }, 0, 0, A, .unit = "measure" },
    { "flatness", "", 0, AV_OPT_TYPE_CONST, {.i64=MEASURE_FLATNESS}, 0, 0, A, .unit = "measure" },
    { "crest",    "", 0, AV_OPT_TYPE_CONST, {.i64=MEASURE_CREST   }, 0, 0, A, .unit = "measure" },
    { "flux",     "", 0, AV_OPT_TYPE_CONST, {.i64=MEASURE_FLUX    }, 0, 0, A, .unit = "measure" },
    { "slope",    "", 0, AV_OPT_TYPE_CONST, {.i64=MEASURE_SLOPE   }, 0, 0, A, .unit = "measure" },
    { "decrease", "", 0, AV_OPT_TYPE_CONST, {.i64=MEASURE_DECREASE}, 0, 0, A, .unit = "measure" },
    { "rolloff",  "", 0, AV_OPT_TYPE_CONST, {.i64=MEASURE_ROLLOFF }, 0, 0, A, .unit = "measure" },
    { NULL }
}

Definition at line 86 of file af_aspectralstats.c.

◆ aspectralstats_outputs

const AVFilterPad aspectralstats_outputs[]

static

Initial value:

= {
    {
        .name         = "default",
        .type         = AVMEDIA_TYPE_AUDIO,
        .config_props = config_output,
    },
}

Definition at line 603 of file af_aspectralstats.c.

◆ ff_af_aspectralstats

const AVFilter ff_af_aspectralstats

Initial value:

= {
    .name          = "aspectralstats",
    .description   = NULL_IF_CONFIG_SMALL("Show frequency domain statistics about audio frames."),
    .priv_size     = sizeof(AudioSpectralStatsContext),
    .priv_class    = &aspectralstats_class,
    .uninit        = uninit,
    .activate      = activate,
    FILTER_INPUTS(ff_audio_default_filterpad),
    FILTER_OUTPUTS(aspectralstats_outputs),
    FILTER_SINGLE_SAMPLEFMT(AV_SAMPLE_FMT_FLTP),
    .flags         = AVFILTER_FLAG_SLICE_THREADS,
}

Definition at line 611 of file af_aspectralstats.c.

Data Structures

Macros

Functions

Variables

Macro Definition Documentation

◆ MEASURE_ALL

◆ MEASURE_NONE

◆ MEASURE_MEAN

◆ MEASURE_VARIANCE

◆ MEASURE_CENTROID

◆ MEASURE_SPREAD

◆ MEASURE_SKEWNESS

◆ MEASURE_KURTOSIS

◆ MEASURE_ENTROPY

◆ MEASURE_FLATNESS

◆ MEASURE_CREST

◆ MEASURE_FLUX

◆ MEASURE_SLOPE

◆ MEASURE_DECREASE

◆ MEASURE_ROLLOFF

◆ OFFSET

◆ A

Function Documentation

◆ AVFILTER_DEFINE_CLASS()

◆ config_output()

◆ set_meta()

◆ set_metadata()

◆ spectral_mean()

◆ sqrf()

◆ spectral_variance()

◆ spectral_centroid()

◆ spectral_spread()

◆ cbrf()

◆ spectral_skewness()

◆ spectral_kurtosis()

◆ spectral_entropy()

◆ spectral_flatness()

◆ spectral_crest()

◆ spectral_flux()

◆ spectral_slope()

◆ spectral_decrease()

◆ spectral_rolloff()

◆ filter_channel()

◆ filter_frame()

◆ activate()

◆ uninit()

Variable Documentation

◆ aspectralstats_options

◆ aspectralstats_outputs

◆ ff_af_aspectralstats