vf_drawbox.c File Reference

Box drawing filter. More...

#include "libavutil/colorspace.h"
#include "libavutil/common.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "libavutil/parseutils.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"

Include dependency graph for vf_drawbox.c:

Go to the source code of this file.

Data Structures
struct	DrawBoxContext

Macros
#define	OFFSET(x)   offsetof(DrawBoxContext, x)
#define	FLAGS   AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Enumerations
enum	{ Y, U, V, A }

Functions
static av_cold int	init (AVFilterContext *ctx)
static int	query_formats (AVFilterContext *ctx)
static int	config_input (AVFilterLink *inlink)
static int	filter_frame (AVFilterLink *inlink, AVFrame *frame)
	AVFILTER_DEFINE_CLASS (drawbox)

Variables
static const AVOption	drawbox_options []
static const AVFilterPad	avfilter_vf_drawbox_inputs []
static const AVFilterPad	avfilter_vf_drawbox_outputs []
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.

Macro Definition Documentation

#define FLAGS   AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 136 of file vf_drawbox.c.

#define OFFSET

(

x

)

offsetof(DrawBoxContext, x)

Definition at line 135 of file vf_drawbox.c.

Enumeration Type Documentation

anonymous enum

Enumerator
Y
U
V
A

Definition at line 37 of file vf_drawbox.c.

Function Documentation

AVFILTER_DEFINE_CLASS

(

drawbox

)

static int config_input ( AVFilterLink *  inlink )

static

Definition at line 82 of file vf_drawbox.c.

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

static

Definition at line 100 of file vf_drawbox.c.

static av_cold int init ( AVFilterContext *  ctx )

static

Definition at line 48 of file vf_drawbox.c.

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 68 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),
    .priv_class = &drawbox_class,
    .init      = init,

    .query_formats   = query_formats,
    .inputs    = avfilter_vf_drawbox_inputs,
    .outputs   = avfilter_vf_drawbox_outputs,
}

Definition at line 174 of file vf_drawbox.c.

const AVFilterPad avfilter_vf_drawbox_inputs[]

static

Initial value:

= {
    {
        .name             = "default",
        .type             = AVMEDIA_TYPE_VIDEO,
        .config_props     = config_input,
        .get_video_buffer = ff_null_get_video_buffer,
        .filter_frame     = filter_frame,
        .needs_writable   = 1,
    },
    { NULL }
}

Definition at line 154 of file vf_drawbox.c.

const AVFilterPad avfilter_vf_drawbox_outputs[]

static

Initial value:

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

Definition at line 166 of file vf_drawbox.c.

const AVOption drawbox_options[]

static

Initial value:

= {
    { "x",      "Horizontal position of the left box edge", OFFSET(x),         AV_OPT_TYPE_INT,    { .i64 = 0 }, INT_MIN, INT_MAX, FLAGS },
    { "y",      "Vertical position of the top box edge",    OFFSET(y),         AV_OPT_TYPE_INT,    { .i64 = 0 }, INT_MIN, INT_MAX, FLAGS },
    { "width",  "Width of the box",                         OFFSET(w),         AV_OPT_TYPE_INT,    { .i64 = 0 }, 0,       INT_MAX, FLAGS },
    { "w",      "Width of the box",                         OFFSET(w),         AV_OPT_TYPE_INT,    { .i64 = 0 }, 0,       INT_MAX, FLAGS },
    { "height", "Height of the box",                        OFFSET(h),         AV_OPT_TYPE_INT,    { .i64 = 0 }, 0,       INT_MAX, FLAGS },
    { "h",      "Height of the box",                        OFFSET(h),         AV_OPT_TYPE_INT,    { .i64 = 0 }, 0,       INT_MAX, FLAGS },
    { "color",  "Color of the box",                         OFFSET(color_str), AV_OPT_TYPE_STRING, { .str = "black" }, CHAR_MIN, CHAR_MAX, .flags = FLAGS },
    { "c",      "Color of the box",                         OFFSET(color_str), AV_OPT_TYPE_STRING, { .str = "black" }, CHAR_MIN, CHAR_MAX, .flags = FLAGS },
    { "thickness",   "set the box maximum thickness",       OFFSET(thickness), AV_OPT_TYPE_INT, {.i64=4}, 0, INT_MAX, FLAGS },
    { "t",           "set the box maximum thickness",       OFFSET(thickness), AV_OPT_TYPE_INT, {.i64=4}, 0, INT_MAX, FLAGS },
    { NULL },
}

Definition at line 138 of file vf_drawbox.c.