af_sidechaincompress.c File Reference

Audio (Sidechain) Compressor filter. More...

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

Go to the source code of this file.

Data Structures
struct	SidechainCompressContext

Macros
#define	OFFSET(x)   offsetof(SidechainCompressContext, x)
#define	A   AV_OPT_FLAG_AUDIO_PARAM
#define	F   AV_OPT_FLAG_FILTERING_PARAM
#define	sidechaincompress_options   options
#define	FAKE_INFINITY   (65536.0 * 65536.0)
#define	IS_FAKE_INFINITY(value)   (fabs(value-FAKE_INFINITY) < 1.0)

Functions
	AVFILTER_DEFINE_CLASS (sidechaincompress)
static double	output_gain (double lin_slope, double ratio, double thres, double knee, double knee_start, double knee_stop, double compressed_knee_stop, int detection)
static int	compressor_config_output (AVFilterLink *outlink)
static void	compressor (SidechainCompressContext *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) Compressor filter.

Definition in file af_sidechaincompress.c.

Macro Definition Documentation

#define OFFSET

(

x

)

offsetof(SidechainCompressContext, x)

Definition at line 65 of file af_sidechaincompress.c.

#define A   AV_OPT_FLAG_AUDIO_PARAM

Definition at line 66 of file af_sidechaincompress.c.

#define F   AV_OPT_FLAG_FILTERING_PARAM

Definition at line 67 of file af_sidechaincompress.c.

#define sidechaincompress_options   options

Definition at line 88 of file af_sidechaincompress.c.

#define FAKE_INFINITY   (65536.0 * 65536.0)

Definition at line 92 of file af_sidechaincompress.c.

#define IS_FAKE_INFINITY

(

value

)

(fabs(value-FAKE_INFINITY) < 1.0)

Definition at line 95 of file af_sidechaincompress.c.

Referenced by output_gain().

Function Documentation

AVFILTER_DEFINE_CLASS

(

sidechaincompress

)

static double output_gain ( double  lin_slope, double  ratio, double  thres, double  knee, double  knee_start, double  knee_stop, double  compressed_knee_stop, int  detection  )

static

Definition at line 97 of file af_sidechaincompress.c.

Referenced by compressor().

static int compressor_config_output ( AVFilterLink *  outlink )

static

Definition at line 124 of file af_sidechaincompress.c.

static void compressor ( SidechainCompressContext *  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 142 of file af_sidechaincompress.c.

Variable Documentation

const AVOption options[]

static

Initial value:

= {
    { "level_in",  "set input gain",     OFFSET(level_in),  AV_OPT_TYPE_DOUBLE, {.dbl=1},        0.015625,   64, A|F },
    { "threshold", "set threshold",      OFFSET(threshold), AV_OPT_TYPE_DOUBLE, {.dbl=0.125}, 0.000976563,    1, A|F },
    { "ratio",     "set ratio",          OFFSET(ratio),     AV_OPT_TYPE_DOUBLE, {.dbl=2},               1,   20, A|F },
    { "attack",    "set attack",         OFFSET(attack),    AV_OPT_TYPE_DOUBLE, {.dbl=20},           0.01, 2000, A|F },
    { "release",   "set release",        OFFSET(release),   AV_OPT_TYPE_DOUBLE, {.dbl=250},          0.01, 9000, A|F },
    { "makeup",    "set make up gain",   OFFSET(makeup),    AV_OPT_TYPE_DOUBLE, {.dbl=2},               1,   64, A|F },
    { "knee",      "set knee",           OFFSET(knee),      AV_OPT_TYPE_DOUBLE, {.dbl=2.82843},         1,    8, A|F },
    { "link",      "set link type",      OFFSET(link),      AV_OPT_TYPE_INT,    {.i64=0},               0,    1, A|F, "link" },
    {   "average", 0,                    0,                 AV_OPT_TYPE_CONST,  {.i64=0},               0,    0, A|F, "link" },
    {   "maximum", 0,                    0,                 AV_OPT_TYPE_CONST,  {.i64=1},               0,    0, A|F, "link" },
    { "detection", "set detection",      OFFSET(detection), AV_OPT_TYPE_INT,    {.i64=1},               0,    1, A|F, "detection" },
    {   "peak",    0,                    0,                 AV_OPT_TYPE_CONST,  {.i64=0},               0,    0, A|F, "detection" },
    {   "rms",     0,                    0,                 AV_OPT_TYPE_CONST,  {.i64=1},               0,    0, A|F, "detection" },
    { "level_sc",  "set sidechain gain", OFFSET(level_sc),  AV_OPT_TYPE_DOUBLE, {.dbl=1},        0.015625,   64, A|F },
    { "mix",       "set mix",            OFFSET(mix),       AV_OPT_TYPE_DOUBLE, {.dbl=1},               0,    1, A|F },
    { NULL }
}

Definition at line 69 of file af_sidechaincompress.c.