vf_alphaextract.c File Reference

simple channel-swapping filter to get at the alpha component More...

#include <string.h>
#include "libavutil/pixfmt.h"
#include "avfilter.h"
#include "drawutils.h"
#include "internal.h"
#include "formats.h"
#include "video.h"

Go to the source code of this file.

Data Structures
struct	AlphaExtractContext

Enumerations
enum	{ Y, U, V, A }

Functions
static int	query_formats (AVFilterContext *ctx)
static int	config_input (AVFilterLink *inlink)
static int	filter_frame (AVFilterLink *inlink, AVFilterBufferRef *cur_buf)

Variables
static const AVFilterPad	alphaextract_inputs []
static const AVFilterPad	alphaextract_outputs []
AVFilter	avfilter_vf_alphaextract

Detailed Description

simple channel-swapping filter to get at the alpha component

Definition in file vf_alphaextract.c.

Enumeration Type Documentation

anonymous enum

Enumerator:

Y
U
V
A

Definition at line 35 of file vf_alphaextract.c.

Function Documentation

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 42 of file vf_alphaextract.c.

static int config_input ( AVFilterLink *  inlink )

static

Definition at line 55 of file vf_alphaextract.c.

static int filter_frame ( AVFilterLink *  inlink, AVFilterBufferRef *  cur_buf  )

static

Definition at line 63 of file vf_alphaextract.c.

Variable Documentation

const AVFilterPad alphaextract_inputs[]

static

Initial value:

= {
    {
        .name         = "default",
        .type         = AVMEDIA_TYPE_VIDEO,
        .config_props = config_input,
        .filter_frame = filter_frame,
        .min_perms    = AV_PERM_READ,
    },
    { NULL }
}

Definition at line 106 of file vf_alphaextract.c.

const AVFilterPad alphaextract_outputs[]

static

Initial value:

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

Definition at line 117 of file vf_alphaextract.c.

AVFilter avfilter_vf_alphaextract

Initial value:

= {
    .name           = "alphaextract",
    .description    = NULL_IF_CONFIG_SMALL("Extract an alpha channel as a "
                      "grayscale image component."),
    .priv_size      = sizeof(AlphaExtractContext),
    .query_formats  = query_formats,
    .inputs         = alphaextract_inputs,
    .outputs        = alphaextract_outputs,
}

Definition at line 125 of file vf_alphaextract.c.