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

Macros
#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	filter_frame (AVFilterLink *link, AVFilterBufferRef *in)

Variables
static const AVFilterPad	avfilter_vf_unsharp_inputs []
static const AVFilterPad	avfilter_vf_unsharp_outputs []
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.

Macro Definition Documentation

#define MIN_SIZE   3

Definition at line 47 of file vf_unsharp.c.

#define MAX_SIZE   13

Definition at line 48 of file vf_unsharp.c.

Referenced by apply_unsharp().

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

Definition at line 51 of file vf_unsharp.c.

Referenced by config_props(), and filter_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 filter_frame().

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 int init ( AVFilterContext *  ctx, const char *  args  )

static

Definition at line 135 of file vf_unsharp.c.

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 160 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 config_props ( AVFilterLink *  link )

static

Definition at line 187 of file vf_unsharp.c.

static void free_filter_param ( FilterParam *  fp )

static

Definition at line 201 of file vf_unsharp.c.

Referenced by uninit().

static av_cold void uninit ( AVFilterContext *  ctx )

static

Definition at line 209 of file vf_unsharp.c.

static int filter_frame ( AVFilterLink *  link, AVFilterBufferRef *  in  )

static

Definition at line 217 of file vf_unsharp.c.

Variable Documentation

const AVFilterPad avfilter_vf_unsharp_inputs[]

static

Initial value:

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

Definition at line 240 of file vf_unsharp.c.

const AVFilterPad avfilter_vf_unsharp_outputs[]

static

Initial value:

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

Definition at line 251 of file vf_unsharp.c.

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    = avfilter_vf_unsharp_inputs,

    .outputs   = avfilter_vf_unsharp_outputs,
}

Definition at line 259 of file vf_unsharp.c.