af_agate.c File Reference

Audio (Sidechain) Gate filter. More...

#include "libavutil/audio_fifo.h"
#include "libavutil/avassert.h"
#include "libavutil/channel_layout.h"
#include "libavutil/opt.h"
#include "avfilter.h"
#include "audio.h"
#include "formats.h"
#include "hermite.h"

Go to the source code of this file.

Data Structures
struct	AudioGateContext

Macros
#define	OFFSET(x)   offsetof(AudioGateContext, x)
#define	A   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
#define	FAKE_INFINITY   (65536.0 * 65536.0)
#define	IS_FAKE_INFINITY(value)   (fabs(value-FAKE_INFINITY) < 1.0)

Functions
static int	agate_config_input (AVFilterLink *inlink)
static double	output_gain (double lin_slope, double ratio, double thres, double knee, double knee_start, double knee_stop, double lin_knee_stop, double range)
static void	gate (AudioGateContext *s, const double *src, double *dst, const double *scsrc, int nb_samples, double level_in, double level_sc, AVFilterLink *inlink, AVFilterLink *sclink)

Variables
static const AVOption	options []

Detailed Description

Audio (Sidechain) Gate filter.

Definition in file af_agate.c.

Macro Definition Documentation

#define OFFSET

(

x

)

offsetof(AudioGateContext, x)

Definition at line 62 of file af_agate.c.

#define A   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 63 of file af_agate.c.

#define FAKE_INFINITY   (65536.0 * 65536.0)

Definition at line 107 of file af_agate.c.

#define IS_FAKE_INFINITY

(

value

)

(fabs(value-FAKE_INFINITY) < 1.0)

Definition at line 110 of file af_agate.c.

Referenced by output_gain().

Function Documentation

static int agate_config_input ( AVFilterLink *  inlink )

static

Definition at line 84 of file af_agate.c.

static double output_gain ( double  lin_slope, double  ratio, double  thres, double  knee, double  knee_start, double  knee_stop, double  lin_knee_stop, double  range  )

static

Definition at line 112 of file af_agate.c.

Referenced by gate().

static void gate ( AudioGateContext *  s, const double *  src, double *  dst, const double *  scsrc, int  nb_samples, double  level_in, double  level_sc, AVFilterLink *  inlink, AVFilterLink *  sclink  )

static

Definition at line 136 of file af_agate.c.

Variable Documentation

const AVOption options[]

static

Initial value:

= {
    { "level_in",  "set input level",        OFFSET(level_in),  AV_OPT_TYPE_DOUBLE, {.dbl=1},           0.015625,   64, A },
    { "range",     "set max gain reduction", OFFSET(range),     AV_OPT_TYPE_DOUBLE, {.dbl=0.06125},     0, 1, A },
    { "threshold", "set threshold",          OFFSET(threshold), AV_OPT_TYPE_DOUBLE, {.dbl=0.125},       0, 1, A },
    { "ratio",     "set ratio",              OFFSET(ratio),     AV_OPT_TYPE_DOUBLE, {.dbl=2},           1,  9000, A },
    { "attack",    "set attack",             OFFSET(attack),    AV_OPT_TYPE_DOUBLE, {.dbl=20},          0.01, 9000, A },
    { "release",   "set release",            OFFSET(release),   AV_OPT_TYPE_DOUBLE, {.dbl=250},         0.01, 9000, A },
    { "makeup",    "set makeup gain",        OFFSET(makeup),    AV_OPT_TYPE_DOUBLE, {.dbl=1},           1,   64, A },
    { "knee",      "set knee",               OFFSET(knee),      AV_OPT_TYPE_DOUBLE, {.dbl=2.828427125}, 1,    8, A },
    { "detection", "set detection",          OFFSET(detection), AV_OPT_TYPE_INT,    {.i64=1},           0,    1, A, "detection" },
    {   "peak",    0,                        0,                 AV_OPT_TYPE_CONST,  {.i64=0},           0,    0, A, "detection" },
    {   "rms",     0,                        0,                 AV_OPT_TYPE_CONST,  {.i64=1},           0,    0, A, "detection" },
    { "link",      "set link",               OFFSET(link),      AV_OPT_TYPE_INT,    {.i64=0},           0,    1, A, "link" },
    {   "average", 0,                        0,                 AV_OPT_TYPE_CONST,  {.i64=0},           0,    0, A, "link" },
    {   "maximum", 0,                        0,                 AV_OPT_TYPE_CONST,  {.i64=1},           0,    0, A, "link" },
    { "level_sc",  "set sidechain gain",     OFFSET(level_sc),  AV_OPT_TYPE_DOUBLE, {.dbl=1},           0.015625,   64, A },
    { NULL }
}

Definition at line 65 of file af_agate.c.