FFmpeg
Data Structures | Macros | Enumerations | Functions | Variables
af_silenceremove.c File Reference
#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  SilenceRemoveContext
 

Macros

#define OFFSET(x)   offsetof(SilenceRemoveContext, x)
 
#define AF   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_AUDIO_PARAM
 

Enumerations

enum  SilenceDetect { D_PEAK, D_RMS }
 
enum  ThresholdMode { T_ANY, T_ALL }
 
enum  SilenceMode {
  SILENCE_TRIM, SILENCE_TRIM_FLUSH, SILENCE_COPY, SILENCE_COPY_FLUSH,
  SILENCE_STOP
}
 

Functions

 AVFILTER_DEFINE_CLASS (silenceremove)
 
static double compute_peak (SilenceRemoveContext *s, double sample)
 
static void update_peak (SilenceRemoveContext *s, double sample)
 
static double compute_rms (SilenceRemoveContext *s, double sample)
 
static void update_rms (SilenceRemoveContext *s, double sample)
 
static av_cold int init (AVFilterContext *ctx)
 
static void clear_window (SilenceRemoveContext *s)
 
static int config_input (AVFilterLink *inlink)
 
static void flush (SilenceRemoveContext *s, AVFrame *out, AVFilterLink *outlink, int *nb_samples_written, int *ret, int flush_silence)
 
static int filter_frame (AVFilterLink *inlink, AVFrame *in)
 
static int request_frame (AVFilterLink *outlink)
 
static int query_formats (AVFilterContext *ctx)
 
static av_cold void uninit (AVFilterContext *ctx)
 

Variables

static const AVOption silenceremove_options []
 
static const AVFilterPad silenceremove_inputs []
 
static const AVFilterPad silenceremove_outputs []
 
const AVFilter ff_af_silenceremove
 

Macro Definition Documentation

◆ OFFSET

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

Definition at line 103 of file af_silenceremove.c.

◆ AF

Definition at line 104 of file af_silenceremove.c.

Enumeration Type Documentation

◆ SilenceDetect

Enumerator
D_PEAK 
D_RMS 

Definition at line 33 of file af_silenceremove.c.

◆ ThresholdMode

Enumerator
T_ANY 
T_ALL 

Definition at line 38 of file af_silenceremove.c.

◆ SilenceMode

Enumerator
SILENCE_TRIM 
SILENCE_TRIM_FLUSH 
SILENCE_COPY 
SILENCE_COPY_FLUSH 
SILENCE_STOP 

Definition at line 43 of file af_silenceremove.c.

Function Documentation

◆ AVFILTER_DEFINE_CLASS()

AVFILTER_DEFINE_CLASS ( silenceremove  )

◆ compute_peak()

static double compute_peak ( SilenceRemoveContext s,
double  sample 
)
static

Definition at line 128 of file af_silenceremove.c.

Referenced by init().

◆ update_peak()

static void update_peak ( SilenceRemoveContext s,
double  sample 
)
static

Definition at line 139 of file af_silenceremove.c.

Referenced by init().

◆ compute_rms()

static double compute_rms ( SilenceRemoveContext s,
double  sample 
)
static

Definition at line 150 of file af_silenceremove.c.

Referenced by init().

◆ update_rms()

static void update_rms ( SilenceRemoveContext s,
double  sample 
)
static

Definition at line 161 of file af_silenceremove.c.

Referenced by init().

◆ init()

static av_cold int init ( AVFilterContext ctx)
static

Definition at line 172 of file af_silenceremove.c.

◆ clear_window()

static void clear_window ( SilenceRemoveContext s)
static

Definition at line 195 of file af_silenceremove.c.

Referenced by config_input(), and filter_frame().

◆ config_input()

static int config_input ( AVFilterLink inlink)
static

Definition at line 204 of file af_silenceremove.c.

◆ flush()

static void flush ( SilenceRemoveContext s,
AVFrame out,
AVFilterLink outlink,
int nb_samples_written,
int ret,
int  flush_silence 
)
static

Definition at line 266 of file af_silenceremove.c.

Referenced by filter_frame().

◆ filter_frame()

static int filter_frame ( AVFilterLink inlink,
AVFrame in 
)
static

Definition at line 320 of file af_silenceremove.c.

◆ request_frame()

static int request_frame ( AVFilterLink outlink)
static

Definition at line 580 of file af_silenceremove.c.

◆ query_formats()

static int query_formats ( AVFilterContext ctx)
static

Definition at line 612 of file af_silenceremove.c.

◆ uninit()

static av_cold void uninit ( AVFilterContext ctx)
static

Definition at line 641 of file af_silenceremove.c.

Variable Documentation

◆ silenceremove_options

const AVOption silenceremove_options[]
static
Initial value:
= {
{ "start_periods", NULL, OFFSET(start_periods), AV_OPT_TYPE_INT, {.i64=0}, 0, 9000, AF },
{ "start_duration", "set start duration of non-silence part", OFFSET(start_duration_opt), AV_OPT_TYPE_DURATION, {.i64=0}, 0, INT32_MAX, AF },
{ "start_threshold", "set threshold for start silence detection", OFFSET(start_threshold), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, DBL_MAX, AF },
{ "start_silence", "set start duration of silence part to keep", OFFSET(start_silence_opt), AV_OPT_TYPE_DURATION, {.i64=0}, 0, INT32_MAX, AF },
{ "start_mode", "set which channel will trigger trimming from start", OFFSET(start_mode), AV_OPT_TYPE_INT, {.i64=T_ANY}, T_ANY, T_ALL, AF, "mode" },
{ "any", 0, 0, AV_OPT_TYPE_CONST, {.i64=T_ANY}, 0, 0, AF, "mode" },
{ "all", 0, 0, AV_OPT_TYPE_CONST, {.i64=T_ALL}, 0, 0, AF, "mode" },
{ "stop_periods", NULL, OFFSET(stop_periods), AV_OPT_TYPE_INT, {.i64=0}, -9000, 9000, AF },
{ "stop_duration", "set stop duration of non-silence part", OFFSET(stop_duration_opt), AV_OPT_TYPE_DURATION, {.i64=0}, 0, INT32_MAX, AF },
{ "stop_threshold", "set threshold for stop silence detection", OFFSET(stop_threshold), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, DBL_MAX, AF },
{ "stop_silence", "set stop duration of silence part to keep", OFFSET(stop_silence_opt), AV_OPT_TYPE_DURATION, {.i64=0}, 0, INT32_MAX, AF },
{ "stop_mode", "set which channel will trigger trimming from end", OFFSET(stop_mode), AV_OPT_TYPE_INT, {.i64=T_ANY}, T_ANY, T_ALL, AF, "mode" },
{ "detection", "set how silence is detected", OFFSET(detection), AV_OPT_TYPE_INT, {.i64=D_RMS}, D_PEAK,D_RMS, AF, "detection" },
{ "peak", "use absolute values of samples", 0, AV_OPT_TYPE_CONST, {.i64=D_PEAK},0, 0, AF, "detection" },
{ "rms", "use squared values of samples", 0, AV_OPT_TYPE_CONST, {.i64=D_RMS}, 0, 0, AF, "detection" },
{ "window", "set duration of window in seconds", OFFSET(window_ratio), AV_OPT_TYPE_DOUBLE, {.dbl=0.02}, 0, 10, AF },
{ NULL }
}

Definition at line 106 of file af_silenceremove.c.

◆ silenceremove_inputs

const AVFilterPad silenceremove_inputs[]
static
Initial value:
= {
{
.name = "default",
.config_props = config_input,
.filter_frame = filter_frame,
},
{ NULL }
}

Definition at line 652 of file af_silenceremove.c.

◆ silenceremove_outputs

const AVFilterPad silenceremove_outputs[]
static
Initial value:
= {
{
.name = "default",
.request_frame = request_frame,
},
{ NULL }
}

Definition at line 662 of file af_silenceremove.c.

◆ ff_af_silenceremove

const AVFilter ff_af_silenceremove
Initial value:
= {
.name = "silenceremove",
.description = NULL_IF_CONFIG_SMALL("Remove silence."),
.priv_size = sizeof(SilenceRemoveContext),
.priv_class = &silenceremove_class,
.init = init,
}

Definition at line 671 of file af_silenceremove.c.

init
static av_cold int init(AVFilterContext *ctx)
Definition: af_silenceremove.c:172
request_frame
static int request_frame(AVFilterLink *outlink)
Definition: af_silenceremove.c:580
AV_OPT_TYPE_DURATION
@ AV_OPT_TYPE_DURATION
Definition: opt.h:239
silenceremove_inputs
static const AVFilterPad silenceremove_inputs[]
Definition: af_silenceremove.c:652
inputs
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several inputs
Definition: filter_design.txt:243
AV_OPT_TYPE_DOUBLE
@ AV_OPT_TYPE_DOUBLE
Definition: opt.h:227
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
filter_frame
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
Definition: af_silenceremove.c:320
outputs
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
query_formats
static int query_formats(AVFilterContext *ctx)
Definition: af_silenceremove.c:612
NULL
#define NULL
Definition: coverity.c:32
SilenceRemoveContext
Definition: af_silenceremove.c:51
uninit
static av_cold void uninit(AVFilterContext *ctx)
Definition: af_silenceremove.c:641
AF
#define AF
Definition: af_silenceremove.c:104
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
config_input
static int config_input(AVFilterLink *inlink)
Definition: af_silenceremove.c:204
D_PEAK
@ D_PEAK
Definition: af_silenceremove.c:34
OFFSET
#define OFFSET(x)
Definition: af_silenceremove.c:103
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Definition: opt.h:225
silenceremove_outputs
static const AVFilterPad silenceremove_outputs[]
Definition: af_silenceremove.c:662
T_ALL
@ T_ALL
Definition: af_silenceremove.c:40
D_RMS
@ D_RMS
Definition: af_silenceremove.c:35
AV_OPT_TYPE_CONST
@ AV_OPT_TYPE_CONST
Definition: opt.h:234
T_ANY
@ T_ANY
Definition: af_silenceremove.c:39