af_alimiter.c File Reference

Lookahead limiter filter. More...

#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 "internal.h"

Go to the source code of this file.

Data Structures
struct	AudioLimiterContext

Macros
#define	OFFSET(x)   offsetof(AudioLimiterContext, x)
#define	A   AV_OPT_FLAG_AUDIO_PARAM
#define	F   AV_OPT_FLAG_FILTERING_PARAM

Functions
	AVFILTER_DEFINE_CLASS (alimiter)
static av_cold int	init (AVFilterContext *ctx)
static double	get_rdelta (AudioLimiterContext *s, double release, int sample_rate, double peak, double limit, double patt, int asc)
static int	filter_frame (AVFilterLink *inlink, AVFrame *in)
static int	query_formats (AVFilterContext *ctx)
static int	config_input (AVFilterLink *inlink)
static av_cold void	uninit (AVFilterContext *ctx)

Variables
static const AVOption	alimiter_options []
static const AVFilterPad	alimiter_inputs []
static const AVFilterPad	alimiter_outputs []
AVFilter	ff_af_alimiter

Detailed Description

Lookahead limiter filter.

Definition in file af_alimiter.c.

Macro Definition Documentation

#define OFFSET

(

x

)

offsetof(AudioLimiterContext, x)

Definition at line 65 of file af_alimiter.c.

#define A   AV_OPT_FLAG_AUDIO_PARAM

Definition at line 66 of file af_alimiter.c.

#define F   AV_OPT_FLAG_FILTERING_PARAM

Definition at line 67 of file af_alimiter.c.

Function Documentation

AVFILTER_DEFINE_CLASS

(

alimiter

)

static av_cold int init ( AVFilterContext *  ctx )

static

Definition at line 83 of file af_alimiter.c.

static double get_rdelta ( AudioLimiterContext *  s, double  release, int  sample_rate, double  peak, double  limit, double  patt, int  asc  )

static

Definition at line 96 of file af_alimiter.c.

Referenced by filter_frame().

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

static

Definition at line 115 of file af_alimiter.c.

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 280 of file af_alimiter.c.

static int config_input ( AVFilterLink *  inlink )

static

Definition at line 310 of file af_alimiter.c.

static av_cold void uninit ( AVFilterContext *  ctx )

static

Definition at line 333 of file af_alimiter.c.

Variable Documentation

const AVOption alimiter_options[]

static

Initial value:

= {
    { "level_in",  "set input level",  OFFSET(level_in),     AV_OPT_TYPE_DOUBLE, {.dbl=1},.015625,   64, A|F },
    { "level_out", "set output level", OFFSET(level_out),    AV_OPT_TYPE_DOUBLE, {.dbl=1},.015625,   64, A|F },
    { "limit",     "set limit",        OFFSET(limit),        AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.0625,    1, A|F },
    { "attack",    "set attack",       OFFSET(attack),       AV_OPT_TYPE_DOUBLE, {.dbl=5},    0.1,   80, A|F },
    { "release",   "set release",      OFFSET(release),      AV_OPT_TYPE_DOUBLE, {.dbl=50},     1, 8000, A|F },
    { "asc",       "enable asc",       OFFSET(auto_release), AV_OPT_TYPE_BOOL,   {.i64=0},      0,    1, A|F },
    { "asc_level", "set asc level",    OFFSET(asc_coeff),    AV_OPT_TYPE_DOUBLE, {.dbl=0.5},    0,    1, A|F },
    { "level",     "auto level",       OFFSET(auto_level),   AV_OPT_TYPE_BOOL,   {.i64=1},      0,    1, A|F },
    { NULL }
}

Definition at line 69 of file af_alimiter.c.

const AVFilterPad alimiter_inputs[]

static

Initial value:

= {
    {
        .name         = "main",
        .type         = AVMEDIA_TYPE_AUDIO,
        .filter_frame = filter_frame,
        .config_props = config_input,
    },
    { NULL }
}

Definition at line 342 of file af_alimiter.c.

const AVFilterPad alimiter_outputs[]

static

Initial value:

= {
    {
        .name = "default",
        .type = AVMEDIA_TYPE_AUDIO,
    },
    { NULL }
}

Definition at line 352 of file af_alimiter.c.

AVFilter ff_af_alimiter

Initial value:

= {
    .name           = "alimiter",
    .description    = NULL_IF_CONFIG_SMALL("Audio lookahead limiter."),
    .priv_size      = sizeof(AudioLimiterContext),
    .priv_class     = &alimiter_class,
    .init           = init,
    .uninit         = uninit,
    .query_formats  = query_formats,
    .inputs         = alimiter_inputs,
    .outputs        = alimiter_outputs,
}

Definition at line 360 of file af_alimiter.c.