af_silencedetect.c File Reference

Audio silence detector. More...

#include <float.h>
#include "libavutil/channel_layout.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

Functions
	AVFILTER_DEFINE_CLASS (silencedetect)
static av_cold int	init (AVFilterContext *ctx, const char *args)
static char *	get_metadata_val (AVFilterBufferRef *insamples, const char *key)
static int	filter_frame (AVFilterLink *inlink, AVFilterBufferRef *insamples)
static int	query_formats (AVFilterContext *ctx)

Variables
static const AVOption	silencedetect_options []
static const AVFilterPad	silencedetect_inputs []
static const AVFilterPad	silencedetect_outputs []
AVFilter	avfilter_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 45 of file af_silencedetect.c.

#define FLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_AUDIO_PARAM

Definition at line 46 of file af_silencedetect.c.

Function Documentation

AVFILTER_DEFINE_CLASS

(

silencedetect

)

static av_cold int init ( AVFilterContext *  ctx, const char *  args  )

static

Definition at line 57 of file af_silencedetect.c.

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

static

Definition at line 73 of file af_silencedetect.c.

Referenced by filter_frame().

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

static

Definition at line 79 of file af_silencedetect.c.

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 130 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 47 of file af_silencedetect.c.

const AVFilterPad silencedetect_inputs[]

static

Initial value:

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

Definition at line 157 of file af_silencedetect.c.

const AVFilterPad silencedetect_outputs[]

static

Initial value:

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

Definition at line 167 of file af_silencedetect.c.

AVFilter avfilter_af_silencedetect

Initial value:

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

Definition at line 175 of file af_silencedetect.c.