af_alimiter.c File Reference

Lookahead limiter filter. More...

#include "libavutil/channel_layout.h"
#include "libavutil/common.h"
#include "libavutil/fifo.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "audio.h"
#include "avfilter.h"
#include "filters.h"

Go to the source code of this file.

Data Structures
struct	MetaItem
struct	AudioLimiterContext

Macros
#define	OFFSET(x)
#define	AF   AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_RUNTIME_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	request_frame (AVFilterLink *outlink)
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 []
const FFFilter	ff_af_alimiter

Detailed Description

Lookahead limiter filter.

Definition in file af_alimiter.c.

Macro Definition Documentation

OFFSET

#define OFFSET

(

x

)

Value:

offsetof(AudioLimiterContext, x)

Definition at line 78 of file af_alimiter.c.

AF

#define AF   AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_RUNTIME_PARAM

Definition at line 79 of file af_alimiter.c.

Function Documentation

AVFILTER_DEFINE_CLASS()

AVFILTER_DEFINE_CLASS

(

alimiter

)

init()

static av_cold int init ( AVFilterContext * ctx )

static

Definition at line 96 of file af_alimiter.c.

get_rdelta()

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

static

Definition at line 109 of file af_alimiter.c.

Referenced by filter_frame().

filter_frame()

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

static

Definition at line 128 of file af_alimiter.c.

Referenced by request_frame().

request_frame()

static int request_frame ( AVFilterLink * outlink )

static

Definition at line 339 of file af_alimiter.c.

config_input()

static int config_input ( AVFilterLink * inlink )

static

Definition at line 359 of file af_alimiter.c.

uninit()

static av_cold void uninit ( AVFilterContext * ctx )

static

Definition at line 396 of file af_alimiter.c.

Variable Documentation

alimiter_options

const AVOption alimiter_options[]

static

Initial value:

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

Definition at line 81 of file af_alimiter.c.

alimiter_inputs

const AVFilterPad alimiter_inputs[]

static

Initial value:

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

Definition at line 407 of file af_alimiter.c.

alimiter_outputs

const AVFilterPad alimiter_outputs[]

static

Initial value:

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

Definition at line 416 of file af_alimiter.c.

ff_af_alimiter

const FFFilter ff_af_alimiter

Initial value:

= {
    .p.name         = "alimiter",
    .p.description  = NULL_IF_CONFIG_SMALL("Audio lookahead limiter."),
    .p.priv_class   = &alimiter_class,
    .p.flags        = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
    .priv_size      = sizeof(AudioLimiterContext),
    .init           = init,
    .uninit         = uninit,
    FILTER_INPUTS(alimiter_inputs),
    FILTER_OUTPUTS(alimiter_outputs),
    FILTER_SINGLE_SAMPLEFMT(AV_SAMPLE_FMT_DBL),
    .process_command = ff_filter_process_command,
}

Definition at line 424 of file af_alimiter.c.