af_astats.c File Reference

#include <float.h>
#include "libavutil/opt.h"
#include "audio.h"
#include "avfilter.h"
#include "internal.h"

Go to the source code of this file.

Data Structures
struct	ChannelStats
struct	AudioStatsContext

Macros
#define	OFFSET(x)   offsetof(AudioStatsContext, x)
#define	FLAGS   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
#define	LINEAR_TO_DB(x)   (log10(x) * 20)

Functions
	AVFILTER_DEFINE_CLASS (astats)
static int	query_formats (AVFilterContext *ctx)
static int	config_output (AVFilterLink *outlink)
static void	update_stat (AudioStatsContext *s, ChannelStats *p, double d)
static int	filter_frame (AVFilterLink *inlink, AVFrame *buf)
static void	print_stats (AVFilterContext *ctx)
static av_cold void	uninit (AVFilterContext *ctx)

Variables
static const AVOption	astats_options []
static const AVFilterPad	astats_inputs []
static const AVFilterPad	astats_outputs []
AVFilter	ff_af_astats

Macro Definition Documentation

#define OFFSET

(

x

)

offsetof(AudioStatsContext, x)

Definition at line 49 of file af_astats.c.

#define FLAGS   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 50 of file af_astats.c.

#define LINEAR_TO_DB

(

x

)

(log10(x) * 20)

Definition at line 176 of file af_astats.c.

Referenced by print_stats().

Function Documentation

AVFILTER_DEFINE_CLASS

(

astats

)

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 59 of file af_astats.c.

static int config_output ( AVFilterLink *  outlink )

static

Definition at line 86 of file af_astats.c.

static void update_stat ( AudioStatsContext *  s, ChannelStats *  p, double  d  )

inlinestatic

Definition at line 108 of file af_astats.c.

Referenced by filter_frame().

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

static

Definition at line 146 of file af_astats.c.

static void print_stats ( AVFilterContext *  ctx )

static

Definition at line 178 of file af_astats.c.

static av_cold void uninit ( AVFilterContext *  ctx )

static

Definition at line 239 of file af_astats.c.

Variable Documentation

const AVOption astats_options[]

static

Initial value:

= {
    { "length", "set the window length", OFFSET(time_constant), AV_OPT_TYPE_DOUBLE, {.dbl=.05}, .01, 10, FLAGS },
    { NULL }
}

Definition at line 52 of file af_astats.c.

const AVFilterPad astats_inputs[]

static

Initial value:

= {
    {
        .name         = "default",
        .type         = AVMEDIA_TYPE_AUDIO,
        .filter_frame = filter_frame,
    },
    { NULL }
}

Definition at line 247 of file af_astats.c.

const AVFilterPad astats_outputs[]

static

Initial value:

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

Definition at line 256 of file af_astats.c.

AVFilter ff_af_astats

Initial value:

= {
    .name          = "astats",
    .description   = NULL_IF_CONFIG_SMALL("Show time domain statistics about audio frames."),
    .query_formats = query_formats,
    .priv_size     = sizeof(AudioStatsContext),
    .priv_class    = &astats_class,
    .uninit        = uninit,
    .inputs        = astats_inputs,
    .outputs       = astats_outputs,
}

Definition at line 265 of file af_astats.c.