vf_edgedetect.c File Reference

Edge detection filter. More...

#include "libavutil/avassert.h"
#include "libavutil/imgutils.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "avfilter.h"
#include "filters.h"
#include "formats.h"
#include "video.h"
#include "edge_common.h"

Go to the source code of this file.

Data Structures
struct	plane_info
struct	EdgeDetectContext

Macros
#define	PLANE_R   0x4
#define	PLANE_G   0x1
#define	PLANE_B   0x2
#define	PLANE_Y   0x1
#define	PLANE_U   0x2
#define	PLANE_V   0x4
#define	PLANE_A   0x8
#define	OFFSET(x)
#define	FLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

Enumerations
enum	FilterMode { MODE_WIRES , MODE_COLORMIX , MODE_CANNY , NB_MODE }

Functions
	AVFILTER_DEFINE_CLASS (edgedetect)
static av_cold int	init (AVFilterContext *ctx)
static int	query_formats (const AVFilterContext *ctx, AVFilterFormatsConfig **cfg_in, AVFilterFormatsConfig **cfg_out)
static int	config_props (AVFilterLink *inlink)
static void	color_mix (int w, int h, uint8_t *dst, int dst_linesize, const uint8_t *src, int src_linesize)
static int	filter_frame (AVFilterLink *inlink, AVFrame *in)
static av_cold void	uninit (AVFilterContext *ctx)

Variables
static const AVOption	edgedetect_options []
static const AVFilterPad	edgedetect_inputs []
const FFFilter	ff_vf_edgedetect

Detailed Description

Edge detection filter.

See also

https://en.wikipedia.org/wiki/Canny_edge_detector

Definition in file vf_edgedetect.c.

Macro Definition Documentation

PLANE_R

#define PLANE_R   0x4

Definition at line 38 of file vf_edgedetect.c.

Referenced by config_input().

PLANE_G

#define PLANE_G   0x1

Definition at line 39 of file vf_edgedetect.c.

Referenced by config_input().

PLANE_B

#define PLANE_B   0x2

Definition at line 40 of file vf_edgedetect.c.

Referenced by config_input().

PLANE_Y

#define PLANE_Y   0x1

Definition at line 41 of file vf_edgedetect.c.

Referenced by config_input().

PLANE_U

#define PLANE_U   0x2

Definition at line 42 of file vf_edgedetect.c.

Referenced by config_input().

PLANE_V

#define PLANE_V   0x4

Definition at line 43 of file vf_edgedetect.c.

Referenced by config_input().

PLANE_A

#define PLANE_A   0x8

Definition at line 44 of file vf_edgedetect.c.

Referenced by config_input().

OFFSET

#define OFFSET

(

x

)

Value:

offsetof(EdgeDetectContext, x)

Definition at line 70 of file vf_edgedetect.c.

FLAGS

#define FLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

Definition at line 71 of file vf_edgedetect.c.

Enumeration Type Documentation

FilterMode

enum FilterMode

Enumerator
MODE_WIRES
MODE_COLORMIX
MODE_CANNY
NB_MODE

Definition at line 46 of file vf_edgedetect.c.

Function Documentation

AVFILTER_DEFINE_CLASS()

AVFILTER_DEFINE_CLASS

(

edgedetect

)

init()

static av_cold int init ( AVFilterContext * ctx )

static

Definition at line 91 of file vf_edgedetect.c.

query_formats()

static int query_formats ( const AVFilterContext * ctx, AVFilterFormatsConfig ** cfg_in, AVFilterFormatsConfig ** cfg_out )

static

Definition at line 100 of file vf_edgedetect.c.

config_props()

static int config_props ( AVFilterLink * inlink )

static

Definition at line 122 of file vf_edgedetect.c.

color_mix()

static void color_mix ( int w, int h, uint8_t * dst, int dst_linesize, const uint8_t * src, int src_linesize )

static

Definition at line 146 of file vf_edgedetect.c.

Referenced by filter_frame().

filter_frame()

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

static

Definition at line 160 of file vf_edgedetect.c.

uninit()

static av_cold void uninit ( AVFilterContext * ctx )

static

Definition at line 233 of file vf_edgedetect.c.

Variable Documentation

edgedetect_options

const AVOption edgedetect_options[]

static

Initial value:

= {
    { "high", "set high threshold", OFFSET(high), AV_OPT_TYPE_DOUBLE, {.dbl=50/255.}, 0, 1, FLAGS },
    { "low",  "set low threshold",  OFFSET(low),  AV_OPT_TYPE_DOUBLE, {.dbl=20/255.}, 0, 1, FLAGS },
    { "mode", "set mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=MODE_WIRES}, 0, NB_MODE-1, FLAGS, .unit = "mode" },
        { "wires",    "white/gray wires on black",  0, AV_OPT_TYPE_CONST, {.i64=MODE_WIRES},    INT_MIN, INT_MAX, FLAGS, .unit = "mode" },
        { "colormix", "mix colors",                 0, AV_OPT_TYPE_CONST, {.i64=MODE_COLORMIX}, INT_MIN, INT_MAX, FLAGS, .unit = "mode" },
        { "canny",    "detect edges on planes",     0, AV_OPT_TYPE_CONST, {.i64=MODE_CANNY},    INT_MIN, INT_MAX, FLAGS, .unit = "mode" },
    { "planes", "set planes to filter",  OFFSET(filter_planes), AV_OPT_TYPE_FLAGS, {.i64=7}, 1, 0x7, FLAGS, .unit = "flags" },
        { "y", "filter luma plane",  0, AV_OPT_TYPE_CONST, {.i64=PLANE_Y}, 0, 0, FLAGS, .unit = "flags" },
        { "u", "filter u plane",     0, AV_OPT_TYPE_CONST, {.i64=PLANE_U}, 0, 0, FLAGS, .unit = "flags" },
        { "v", "filter v plane",     0, AV_OPT_TYPE_CONST, {.i64=PLANE_V}, 0, 0, FLAGS, .unit = "flags" },
        { "r", "filter red plane",   0, AV_OPT_TYPE_CONST, {.i64=PLANE_R}, 0, 0, FLAGS, .unit = "flags" },
        { "g", "filter green plane", 0, AV_OPT_TYPE_CONST, {.i64=PLANE_G}, 0, 0, FLAGS, .unit = "flags" },
        { "b", "filter blue plane",  0, AV_OPT_TYPE_CONST, {.i64=PLANE_B}, 0, 0, FLAGS, .unit = "flags" },
    { NULL }
}

Definition at line 72 of file vf_edgedetect.c.

edgedetect_inputs

const AVFilterPad edgedetect_inputs[]

static

Initial value:

= {
    {
        .name         = "default",
        .type         = AVMEDIA_TYPE_VIDEO,
        .config_props = config_props,
        .filter_frame = filter_frame,
    },
}

Definition at line 246 of file vf_edgedetect.c.

ff_vf_edgedetect

const FFFilter ff_vf_edgedetect

Initial value:

= {
    .p.name        = "edgedetect",
    .p.description = NULL_IF_CONFIG_SMALL("Detect and draw edge."),
    .p.priv_class  = &edgedetect_class,
    .p.flags       = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
    .priv_size     = sizeof(EdgeDetectContext),
    .init          = init,
    .uninit        = uninit,
    FILTER_INPUTS(edgedetect_inputs),
    FILTER_OUTPUTS(ff_video_default_filterpad),
    FILTER_QUERY_FUNC2(query_formats),
}

Definition at line 255 of file vf_edgedetect.c.