libavfilter/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 "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	draw_slice (AVFilterLink *inlink, int y0, int h, int slice_dir)
Variables
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 34 of file vf_alphaextract.c.

---

Function Documentation

static int config_input

(

AVFilterLink *

inlink

)

[static]

Definition at line 54 of file vf_alphaextract.c.

static int draw_slice	(	AVFilterLink *	inlink,
		int	y0,
		int	h,
		int	slice_dir
	)			[static]

Definition at line 62 of file vf_alphaextract.c.

static int query_formats

(

AVFilterContext *

ctx

)

[static]

Definition at line 41 of file vf_alphaextract.c.

---

Variable Documentation

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    = (const AVFilterPad[]) {
        { .name             = "default",
          .type             = AVMEDIA_TYPE_VIDEO,
          .config_props     = config_input,
          .draw_slice       = draw_slice,
          .min_perms        = AV_PERM_READ },
        { .name = NULL }
    },
    .outputs   = (const AVFilterPad[]) {
      { .name               = "default",
        .type               = AVMEDIA_TYPE_VIDEO, },
      { .name = NULL }
    },
}

Definition at line 97 of file vf_alphaextract.c.