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 []
AVFilter	ff_af_silenceremove

Macro Definition Documentation

OFFSET

#define OFFSET

(

x

)

offsetof(SilenceRemoveContext, x)

Definition at line 103 of file af_silenceremove.c.

AF

#define AF   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_AUDIO_PARAM

Definition at line 104 of file af_silenceremove.c.

Enumeration Type Documentation

SilenceDetect

enum SilenceDetect

Enumerator
D_PEAK
D_RMS

Definition at line 33 of file af_silenceremove.c.

ThresholdMode

enum ThresholdMode

Enumerator
T_ANY
T_ALL

Definition at line 38 of file af_silenceremove.c.

SilenceMode

enum 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",
        .type         = AVMEDIA_TYPE_AUDIO,
        .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",
        .type          = AVMEDIA_TYPE_AUDIO,
        .request_frame = request_frame,
    },
    { NULL }
}

Definition at line 662 of file af_silenceremove.c.

ff_af_silenceremove

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,
    .uninit        = uninit,
    .query_formats = query_formats,
    .inputs        = silenceremove_inputs,
    .outputs       = silenceremove_outputs,
}

Definition at line 671 of file af_silenceremove.c.