libavfilter/vf_unsharp.c File Reference

blur / sharpen filter, ported to FFmpeg from MPlayer libmpcodecs/unsharp.c. More...

#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
#include "libavutil/common.h"
#include "libavutil/mem.h"
#include "libavutil/pixdesc.h"

Go to the source code of this file.

Data Structures
struct	FilterParam
struct	UnsharpContext
Defines
#define	MIN_SIZE   3
#define	MAX_SIZE   13
#define	SHIFTUP(x, shift)   (-((-(x))>>(shift)))
Functions
static void	apply_unsharp (uint8_t *dst, int dst_stride, const uint8_t *src, int src_stride, int width, int height, FilterParam *fp)
static void	set_filter_param (FilterParam *fp, int msize_x, int msize_y, double amount)
static av_cold int	init (AVFilterContext *ctx, const char *args)
static int	query_formats (AVFilterContext *ctx)
static void	init_filter_param (AVFilterContext *ctx, FilterParam *fp, const char *effect_type, int width)
static int	config_props (AVFilterLink *link)
static void	free_filter_param (FilterParam *fp)
static av_cold void	uninit (AVFilterContext *ctx)
static int	end_frame (AVFilterLink *link)
static int	draw_slice (AVFilterLink *link, int y, int h, int slice_dir)
Variables
AVFilter	avfilter_vf_unsharp

---

Detailed Description

blur / sharpen filter, ported to FFmpeg from MPlayer libmpcodecs/unsharp.c.

This code is based on:

An Efficient algorithm for Gaussian blur using finite-state machines Frederick M. Waltz and John W. V. Miller

SPIE Conf. on Machine Vision Systems for Inspection and Metrology VII Originally published Boston, Nov 98

http://www.engin.umd.umich.edu/~jwvm/ece581/21_GBlur.pdf

Definition in file vf_unsharp.c.

---

Define Documentation

#define MAX_SIZE   13

Definition at line 48 of file vf_unsharp.c.

Referenced by aiff_read_packet(), apply_unsharp(), mmf_read_packet(), and sol_read_packet().

#define MIN_SIZE   3

Definition at line 47 of file vf_unsharp.c.

#define SHIFTUP	(	x,
		shift		)	(-((-(x))>>(shift)))

Definition at line 51 of file vf_unsharp.c.

Referenced by config_props(), and end_frame().

---

Function Documentation

static void apply_unsharp	(	uint8_t *	dst,
		int	dst_stride,
		const uint8_t *	src,
		int	src_stride,
		int	width,
		int	height,
		FilterParam *	fp
	)			[static]

Definition at line 70 of file vf_unsharp.c.

Referenced by end_frame().

static int config_props

(

AVFilterLink *

link

)

[static]

Definition at line 187 of file vf_unsharp.c.

static int draw_slice	(	AVFilterLink *	link,
		int	y,
		int	h,
		int	slice_dir
	)			[static]

Definition at line 235 of file vf_unsharp.c.

static int end_frame

(

AVFilterLink *

link

)

[static]

Definition at line 216 of file vf_unsharp.c.

static void free_filter_param

(

FilterParam *

fp

)

[static]

Definition at line 200 of file vf_unsharp.c.

Referenced by uninit().

static av_cold int init	(	AVFilterContext *	ctx,
		const char *	args
	)			[static]

Definition at line 135 of file vf_unsharp.c.

static void init_filter_param	(	AVFilterContext *	ctx,
		FilterParam *	fp,
		const char *	effect_type,
		int	width
	)			[static]

Definition at line 173 of file vf_unsharp.c.

Referenced by config_props().

static int query_formats

(

AVFilterContext *

ctx

)

[static]

Definition at line 160 of file vf_unsharp.c.

static void set_filter_param	(	FilterParam *	fp,
		int	msize_x,
		int	msize_y,
		double	amount
	)			[static]

Definition at line 123 of file vf_unsharp.c.

Referenced by init().

static av_cold void uninit

(

AVFilterContext *

ctx

)

[static]

Definition at line 208 of file vf_unsharp.c.

---

Variable Documentation

AVFilter avfilter_vf_unsharp

Initial value:

 {
    .name      = "unsharp",
    .description = NULL_IF_CONFIG_SMALL("Sharpen or blur the input video."),

    .priv_size = sizeof(UnsharpContext),

    .init = init,
    .uninit = uninit,
    .query_formats = query_formats,

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

    .outputs   = (const AVFilterPad[]) {{ .name             = "default",
                                          .type             = AVMEDIA_TYPE_VIDEO, },
                                        { .name = NULL}},
}

Definition at line 240 of file vf_unsharp.c.