af_tremolo.c File Reference

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

Go to the source code of this file.

Data Structures
struct	TremoloContext

Macros
#define	OFFSET(x)   offsetof(TremoloContext, x)
#define	FLAGS   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Functions
	AVFILTER_DEFINE_CLASS (tremolo)
static int	filter_frame (AVFilterLink *inlink, AVFrame *in)
static av_cold void	uninit (AVFilterContext *ctx)
static int	config_input (AVFilterLink *inlink)

Variables
static const AVOption	tremolo_options []
static const AVFilterPad	avfilter_af_tremolo_inputs []
const FFFilter	ff_af_tremolo

Macro Definition Documentation

OFFSET

#define OFFSET

(

x

)

offsetof(TremoloContext, x)

Definition at line 36 of file af_tremolo.c.

FLAGS

#define FLAGS   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 37 of file af_tremolo.c.

Function Documentation

AVFILTER_DEFINE_CLASS()

AVFILTER_DEFINE_CLASS

(

tremolo

)

filter_frame()

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

static

Definition at line 47 of file af_tremolo.c.

uninit()

static av_cold void uninit ( AVFilterContext *  ctx )

static

Definition at line 87 of file af_tremolo.c.

config_input()

static int config_input ( AVFilterLink *  inlink )

static

Definition at line 93 of file af_tremolo.c.

Variable Documentation

tremolo_options

const AVOption tremolo_options[]

static

Initial value:

= {
    { "f", "set frequency in hertz",    OFFSET(freq),    AV_OPT_TYPE_DOUBLE,   {.dbl = 5.0},   0.1,   20000.0, FLAGS },
    { "d", "set depth as percentage",   OFFSET(depth),   AV_OPT_TYPE_DOUBLE,   {.dbl = 0.5},   0.0,   1.0,     FLAGS },
    { NULL }
}

Definition at line 39 of file af_tremolo.c.

avfilter_af_tremolo_inputs

const AVFilterPad avfilter_af_tremolo_inputs[]

static

Initial value:

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

Definition at line 116 of file af_tremolo.c.

ff_af_tremolo

const FFFilter ff_af_tremolo

Initial value:

= {
    .p.name        = "tremolo",
    .p.description = NULL_IF_CONFIG_SMALL("Apply tremolo effect."),
    .p.priv_class  = &tremolo_class,
    .p.flags       = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
    .priv_size     = sizeof(TremoloContext),
    .uninit        = uninit,
    FILTER_INPUTS(avfilter_af_tremolo_inputs),
    FILTER_OUTPUTS(ff_audio_default_filterpad),
    FILTER_SINGLE_SAMPLEFMT(AV_SAMPLE_FMT_DBL),
}

Definition at line 125 of file af_tremolo.c.