af_silenceremove.c File Reference

#include <float.h>
#include "libavutil/avassert.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "audio.h"
#include "filters.h"
#include "avfilter.h"
#include "silenceremove_template.c"

Go to the source code of this file.

Data Structures
struct	SilenceRemoveContext

Macros
#define	OFFSET(x)
#define	AF   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_AUDIO_PARAM
#define	AFR   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
#define	DEPTH   32
#define	DEPTH   64

Enumerations
enum	SilenceDetect {   D_AVG , D_RMS , D_PEAK , D_MEDIAN ,   D_PTP , D_DEV , D_NB }
enum	TimestampMode { TS_WRITE , TS_COPY , TS_NB }
enum	ThresholdMode { T_ANY , T_ALL }

Functions
	AVFILTER_DEFINE_CLASS (silenceremove)
static av_cold int	init (AVFilterContext *ctx)
static void	clear_windows (SilenceRemoveContext *s)
static int	config_input (AVFilterLink *inlink)
static int	config_output (AVFilterLink *outlink)
static int	filter_frame (AVFilterLink *outlink, AVFrame *in)
static int	activate (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 FFFilter	ff_af_silenceremove

Macro Definition Documentation

OFFSET

#define OFFSET

(

x

)

Value:

offsetof(SilenceRemoveContext, x)

Definition at line 125 of file af_silenceremove.c.

AF

#define AF   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_AUDIO_PARAM

Definition at line 126 of file af_silenceremove.c.

AFR

#define AFR   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM

Definition at line 127 of file af_silenceremove.c.

DEPTH [1/2]

#define DEPTH   32

Definition at line 158 of file af_silenceremove.c.

DEPTH [2/2]

#define DEPTH   64

Definition at line 158 of file af_silenceremove.c.

Enumeration Type Documentation

SilenceDetect

enum SilenceDetect

Enumerator
D_AVG
D_RMS
D_PEAK
D_MEDIAN
D_PTP
D_DEV
D_NB

Definition at line 33 of file af_silenceremove.c.

TimestampMode

enum TimestampMode

Enumerator
TS_WRITE
TS_COPY
TS_NB

Definition at line 43 of file af_silenceremove.c.

ThresholdMode

enum ThresholdMode

Enumerator
T_ANY
T_ALL

Definition at line 49 of file af_silenceremove.c.

Function Documentation

AVFILTER_DEFINE_CLASS()

AVFILTER_DEFINE_CLASS

(

silenceremove

)

init()

static av_cold int init ( AVFilterContext * ctx )

static

Definition at line 165 of file af_silenceremove.c.

clear_windows()

static void clear_windows ( SilenceRemoveContext * s )

static

Definition at line 177 of file af_silenceremove.c.

Referenced by config_output().

config_input()

static int config_input ( AVFilterLink * inlink )

static

Definition at line 198 of file af_silenceremove.c.

config_output()

static int config_output ( AVFilterLink * outlink )

static

Definition at line 223 of file af_silenceremove.c.

filter_frame()

static int filter_frame ( AVFilterLink * outlink, AVFrame * in )

static

Definition at line 294 of file af_silenceremove.c.

Referenced by activate().

activate()

static int activate ( AVFilterContext * ctx )

static

Definition at line 416 of file af_silenceremove.c.

uninit()

static av_cold void uninit ( AVFilterContext * ctx )

static

Definition at line 448 of file af_silenceremove.c.

Variable Documentation

silenceremove_options

const AVOption silenceremove_options[]

static

Initial value:

= {
    { "start_periods",   "set periods of silence parts to skip from start",    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, AFR },
    { "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, AFR, .unit = "mode" },
    {   "any",           0,                                                    0,                           AV_OPT_TYPE_CONST,    {.i64=T_ANY}, 0,         0, AFR, .unit = "mode" },
    {   "all",           0,                                                    0,                           AV_OPT_TYPE_CONST,    {.i64=T_ALL}, 0,         0, AFR, .unit = "mode" },
    { "stop_periods",    "set periods of silence parts to skip from end",      OFFSET(stop_periods),        AV_OPT_TYPE_INT,      {.i64=0}, -9000,      9000, AF },
    { "stop_duration",   "set stop duration of 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, AFR },
    { "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_ALL}, T_ANY, T_ALL, AFR, .unit = "mode" },
    { "detection",       "set how silence is detected",                        OFFSET(detection),           AV_OPT_TYPE_INT,      {.i64=D_RMS}, 0,    D_NB-1, AF, .unit = "detection" },
    {   "avg",           "use mean absolute values of samples",                0,                           AV_OPT_TYPE_CONST,    {.i64=D_AVG}, 0,         0, AF, .unit = "detection" },
    {   "rms",           "use root mean squared values of samples",            0,                           AV_OPT_TYPE_CONST,    {.i64=D_RMS}, 0,         0, AF, .unit = "detection" },
    {   "peak",          "use max absolute values of samples",                 0,                           AV_OPT_TYPE_CONST,    {.i64=D_PEAK},0,         0, AF, .unit = "detection" },
    {   "median",        "use median of absolute values of samples",           0,                           AV_OPT_TYPE_CONST,    {.i64=D_MEDIAN},0,       0, AF, .unit = "detection" },
    {   "ptp",           "use absolute of max peak to min peak difference",    0,                           AV_OPT_TYPE_CONST,    {.i64=D_PTP}, 0,         0, AF, .unit = "detection" },
    {   "dev",           "use standard deviation from values of samples",      0,                           AV_OPT_TYPE_CONST,    {.i64=D_DEV}, 0,         0, AF, .unit = "detection" },
    { "window",          "set duration of window for silence detection",       OFFSET(window_duration_opt), AV_OPT_TYPE_DURATION, {.i64=20000}, 0, 100000000, AF },
    { "timestamp",       "set how every output frame timestamp is processed",  OFFSET(timestamp_mode),      AV_OPT_TYPE_INT,      {.i64=TS_WRITE}, 0, TS_NB-1, AF, .unit = "timestamp" },
    {   "write",         "full timestamps rewrite, keep only the start time",  0,                           AV_OPT_TYPE_CONST,    {.i64=TS_WRITE}, 0,       0, AF, .unit = "timestamp" },
    {   "copy",          "non-dropped frames are left with same timestamp",    0,                           AV_OPT_TYPE_CONST,    {.i64=TS_COPY},  0,       0, AF, .unit = "timestamp" },
    { NULL }
}

Definition at line 129 of file af_silenceremove.c.

silenceremove_inputs

const AVFilterPad silenceremove_inputs[]

static

Initial value:

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

Definition at line 465 of file af_silenceremove.c.

silenceremove_outputs

const AVFilterPad silenceremove_outputs[]

static

Initial value:

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

Definition at line 473 of file af_silenceremove.c.

ff_af_silenceremove

const FFFilter ff_af_silenceremove

Initial value:

= {
    .p.name        = "silenceremove",
    .p.description = NULL_IF_CONFIG_SMALL("Remove silence."),
    .p.priv_class  = &silenceremove_class,
    .p.flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
    .priv_size     = sizeof(SilenceRemoveContext),
    .init          = init,
    .activate      = activate,
    .uninit        = uninit,
    FILTER_INPUTS(silenceremove_inputs),
    FILTER_OUTPUTS(silenceremove_outputs),
    FILTER_SAMPLEFMTS(AV_SAMPLE_FMT_FLT,
                      AV_SAMPLE_FMT_DBL),
    .process_command = ff_filter_process_command,
}

Definition at line 481 of file af_silenceremove.c.