vf_alphamerge.c File Reference

copy an alpha component from another video's luma More...

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

Go to the source code of this file.

Data Structures
struct	AlphaMergeContext

Enumerations
enum	{ Y, U, V, A }

Functions
static av_cold void	uninit (AVFilterContext *ctx)
static int	query_formats (AVFilterContext *ctx)
static int	config_input_main (AVFilterLink *inlink)
static int	config_output (AVFilterLink *outlink)
static void	draw_frame (AVFilterContext *ctx, AVFilterBufferRef *main_buf, AVFilterBufferRef *alpha_buf)
static int	filter_frame (AVFilterLink *inlink, AVFilterBufferRef *buf)
static int	request_frame (AVFilterLink *outlink)

Variables
static const AVFilterPad	alphamerge_inputs []
static const AVFilterPad	alphamerge_outputs []
AVFilter	avfilter_vf_alphamerge

Detailed Description

copy an alpha component from another video's luma

Definition in file vf_alphamerge.c.

Enumeration Type Documentation

anonymous enum

Enumerator:

Y
U
V
A

Definition at line 36 of file vf_alphamerge.c.

Function Documentation

static av_cold void uninit ( AVFilterContext *  ctx )

static

Definition at line 46 of file vf_alphamerge.c.

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 53 of file vf_alphamerge.c.

static int config_input_main ( AVFilterLink *  inlink )

static

Definition at line 69 of file vf_alphamerge.c.

static int config_output ( AVFilterLink *  outlink )

static

Definition at line 77 of file vf_alphamerge.c.

static void draw_frame ( AVFilterContext *  ctx, AVFilterBufferRef *  main_buf, AVFilterBufferRef *  alpha_buf  )

static

Definition at line 98 of file vf_alphamerge.c.

Referenced by filter_frame().

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

static

Definition at line 129 of file vf_alphamerge.c.

static int request_frame ( AVFilterLink *  outlink )

static

Definition at line 156 of file vf_alphamerge.c.

Variable Documentation

const AVFilterPad alphamerge_inputs[]

static

Initial value:

= {
    {
        .name             = "main",
        .type             = AVMEDIA_TYPE_VIDEO,
        .config_props     = config_input_main,
        .get_video_buffer = ff_null_get_video_buffer,
        .filter_frame     = filter_frame,
        .min_perms        = AV_PERM_READ | AV_PERM_WRITE | AV_PERM_PRESERVE,
    },{
        .name             = "alpha",
        .type             = AVMEDIA_TYPE_VIDEO,
        .filter_frame     = filter_frame,
        .min_perms        = AV_PERM_READ | AV_PERM_PRESERVE,
    },
    { NULL }
}

Definition at line 172 of file vf_alphamerge.c.

const AVFilterPad alphamerge_outputs[]

static

Initial value:

= {
    {
        .name          = "default",
        .type          = AVMEDIA_TYPE_VIDEO,
        .config_props  = config_output,
        .request_frame = request_frame,
    },
    { NULL }
}

Definition at line 189 of file vf_alphamerge.c.

AVFilter avfilter_vf_alphamerge

Initial value:

= {
    .name           = "alphamerge",
    .description    = NULL_IF_CONFIG_SMALL("Copy the luma value of the second "
                      "input into the alpha channel of the first input."),
    .uninit         = uninit,
    .priv_size      = sizeof(AlphaMergeContext),
    .query_formats  = query_formats,
    .inputs         = alphamerge_inputs,
    .outputs        = alphamerge_outputs,
}

Definition at line 199 of file vf_alphamerge.c.