af_dcshift.c File Reference

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

Go to the source code of this file.

Data Structures
struct	DCShiftContext

Macros
#define	OFFSET(x)   offsetof(DCShiftContext, x)
#define	A   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Functions
	AVFILTER_DEFINE_CLASS (dcshift)
static av_cold int	init (AVFilterContext *ctx)
static int	filter_frame (AVFilterLink *inlink, AVFrame *in)

Variables
static const AVOption	dcshift_options []
static const AVFilterPad	dcshift_inputs []
const FFFilter	ff_af_dcshift

Macro Definition Documentation

OFFSET

#define OFFSET

(

x

)

offsetof(DCShiftContext, x)

Definition at line 35 of file af_dcshift.c.

A

#define A   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 36 of file af_dcshift.c.

Function Documentation

AVFILTER_DEFINE_CLASS()

AVFILTER_DEFINE_CLASS

(

dcshift

)

init()

static av_cold int init ( AVFilterContext *  ctx )

static

Definition at line 46 of file af_dcshift.c.

filter_frame()

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

static

Definition at line 55 of file af_dcshift.c.

Variable Documentation

dcshift_options

const AVOption dcshift_options[]

static

Initial value:

= {
    { "shift",       "set DC shift",     OFFSET(dcshift),       AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, A },
    { "limitergain", "set limiter gain", OFFSET(limitergain), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 1, A },
    { NULL }
}

Definition at line 38 of file af_dcshift.c.

dcshift_inputs

const AVFilterPad dcshift_inputs[]

static

Initial value:

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

Definition at line 117 of file af_dcshift.c.

ff_af_dcshift

const FFFilter ff_af_dcshift

Initial value:

= {
    .p.name         = "dcshift",
    .p.description  = NULL_IF_CONFIG_SMALL("Apply a DC shift to the audio."),
    .p.priv_class   = &dcshift_class,
    .p.flags        = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
    .priv_size      = sizeof(DCShiftContext),
    .init           = init,
    FILTER_INPUTS(dcshift_inputs),
    FILTER_OUTPUTS(ff_audio_default_filterpad),
    FILTER_SINGLE_SAMPLEFMT(AV_SAMPLE_FMT_S32P),
}

Definition at line 125 of file af_dcshift.c.