af_silencedetect.c File Reference

Audio silence detector. More...

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

Go to the source code of this file.

Data Structures
struct	SilenceDetectContext

Macros
#define	OFFSET(x)   offsetof(SilenceDetectContext, x)
#define	FLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_AUDIO_PARAM
#define	SILENCE_DETECT(name, type)

Functions
	AVFILTER_DEFINE_CLASS (silencedetect)
static char *	get_metadata_val (AVFrame *insamples, const char *key)
static av_always_inline void	update (SilenceDetectContext *s, AVFrame *insamples, int is_silence, int64_t nb_samples_notify, AVRational time_base)
static int	config_input (AVFilterLink *inlink)
static int	filter_frame (AVFilterLink *inlink, AVFrame *insamples)
static int	query_formats (AVFilterContext *ctx)

Variables
static const AVOption	silencedetect_options []
static const AVFilterPad	silencedetect_inputs []
static const AVFilterPad	silencedetect_outputs []
AVFilter	ff_af_silencedetect

Detailed Description

Audio silence detector.

Definition in file af_silencedetect.c.

Macro Definition Documentation

#define OFFSET

(

x

)

offsetof(SilenceDetectContext, x)

Definition at line 48 of file af_silencedetect.c.

#define FLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_AUDIO_PARAM

Definition at line 49 of file af_silencedetect.c.

#define SILENCE_DETECT	(		name,
			type
	)

Value:

static void silencedetect_##name(SilenceDetectContext *s, AVFrame *insamples,    \
                                 int nb_samples, int64_t nb_samples_notify,      \
                                 AVRational time_base)                           \
{                                                                                \
    const type *p = (const type *)insamples->data[0];                            \
    const type noise = s->noise;                                                 \
    int i;                                                                       \
                                                                                 \
    for (i = 0; i < nb_samples; i++, p++)                                        \
        update(s, insamples, *p < noise && *p > -noise,                          \
               nb_samples_notify, time_base);                                    \
}

Definition at line 96 of file af_silencedetect.c.

Function Documentation

AVFILTER_DEFINE_CLASS

(

silencedetect

)

static char* get_metadata_val ( AVFrame *  insamples, const char *  key  )

static

Definition at line 60 of file af_silencedetect.c.

Referenced by update().

static av_always_inline void update ( SilenceDetectContext *  s, AVFrame *  insamples, int  is_silence, int64_t  nb_samples_notify, AVRational  time_base  )

static

Definition at line 66 of file af_silencedetect.c.

Referenced by adpcm_decode_frame().

static int config_input ( AVFilterLink *  inlink )

static

Definition at line 115 of file af_silencedetect.c.

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

static

Definition at line 136 of file af_silencedetect.c.

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 156 of file af_silencedetect.c.

Variable Documentation

const AVOption silencedetect_options[]

static

Initial value:

= {
    { "n",         "set noise tolerance",              OFFSET(noise),     AV_OPT_TYPE_DOUBLE, {.dbl=0.001},          0, DBL_MAX,  FLAGS },
    { "noise",     "set noise tolerance",              OFFSET(noise),     AV_OPT_TYPE_DOUBLE, {.dbl=0.001},          0, DBL_MAX,  FLAGS },
    { "d",         "set minimum duration in seconds",  OFFSET(duration),  AV_OPT_TYPE_DOUBLE, {.dbl=2.},             0, 24*60*60, FLAGS },
    { "duration",  "set minimum duration in seconds",  OFFSET(duration),  AV_OPT_TYPE_DOUBLE, {.dbl=2.},             0, 24*60*60, FLAGS },
    { NULL }
}

Definition at line 50 of file af_silencedetect.c.

const AVFilterPad silencedetect_inputs[]

static

Initial value:

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

Definition at line 189 of file af_silencedetect.c.

const AVFilterPad silencedetect_outputs[]

static

Initial value:

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

Definition at line 199 of file af_silencedetect.c.

AVFilter ff_af_silencedetect

Initial value:

= {
    .name          = "silencedetect",
    .description   = NULL_IF_CONFIG_SMALL("Detect silence."),
    .priv_size     = sizeof(SilenceDetectContext),
    .query_formats = query_formats,
    .inputs        = silencedetect_inputs,
    .outputs       = silencedetect_outputs,
    .priv_class    = &silencedetect_class,
}

Definition at line 207 of file af_silencedetect.c.