vf_drawbox.c File Reference

Box drawing filter. More...

#include "libavutil/colorspace.h"
#include "libavutil/pixdesc.h"
#include "libavutil/parseutils.h"
#include "avfilter.h"

Go to the source code of this file.

Data Structures
struct	DrawBoxContext

Enumerations
enum	{ Y, U, V, A }

Functions
static av_cold int	init (AVFilterContext *ctx, const char *args, void *opaque)
static int	query_formats (AVFilterContext *ctx)
static int	config_input (AVFilterLink *inlink)
static void	draw_slice (AVFilterLink *inlink, int y0, int h, int slice_dir)

Variables
AVFilter	avfilter_vf_drawbox

Detailed Description

Box drawing filter.

Also a nice template for a filter that needs to write in the input frame.

Definition in file vf_drawbox.c.

Enumeration Type Documentation

anonymous enum

Enumerator:

Y
U
V
A

Definition at line 32 of file vf_drawbox.c.

Function Documentation

static int config_input ( AVFilterLink *  inlink )

static

Definition at line 77 of file vf_drawbox.c.

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

static

Definition at line 94 of file vf_drawbox.c.

static av_cold int init ( AVFilterContext *  ctx, const char *  args, void *  opaque  )

static

Definition at line 40 of file vf_drawbox.c.

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 63 of file vf_drawbox.c.

Variable Documentation

AVFilter avfilter_vf_drawbox

Initial value:

 {
    .name      = "drawbox",
    .description = NULL_IF_CONFIG_SMALL("Draw a colored box on the input video."),
    .priv_size = sizeof(DrawBoxContext),
    .init      = init,

    .query_formats   = query_formats,
    .inputs    = (AVFilterPad[]) {{ .name             = "default",
                                    .type             = AVMEDIA_TYPE_VIDEO,
                                    .config_props     = config_input,
                                    .get_video_buffer = avfilter_null_get_video_buffer,
                                    .start_frame      = avfilter_null_start_frame,
                                    .draw_slice       = draw_slice,
                                    .end_frame        = avfilter_null_end_frame,
                                    .min_perms        = AV_PERM_WRITE | AV_PERM_READ,
                                    .rej_perms        = AV_PERM_PRESERVE },
                                  { .name = NULL}},
    .outputs   = (AVFilterPad[]) {{ .name             = "default",
                                    .type             = AVMEDIA_TYPE_VIDEO, },
                                  { .name = NULL}},
}

Definition at line 123 of file vf_drawbox.c.