vf_unsharp.c File Reference

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

#include <float.h>
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
#include "libavutil/common.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"

Go to the source code of this file.

Data Structures
struct	FilterParam
struct	UnsharpContext

Macros
#define	MIN_MATRIX_SIZE   3
#define	MAX_MATRIX_SIZE   63
#define	SHIFTUP(x, shift)   (-((-(x))>>(shift)))
#define	OFFSET(x)   offsetof(UnsharpContext, x)

Functions
	AVFILTER_DEFINE_CLASS (unsharp)
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 int	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 AVOption	unsharp_options []
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_MATRIX_SIZE   3

Definition at line 50 of file vf_unsharp.c.

#define MAX_MATRIX_SIZE   63

Definition at line 51 of file vf_unsharp.c.

Referenced by apply_unsharp().

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

Definition at line 54 of file vf_unsharp.c.

Referenced by config_props(), and filter_frame().

#define OFFSET

(

x

)

offsetof(UnsharpContext, x)

Definition at line 76 of file vf_unsharp.c.

Function Documentation

AVFILTER_DEFINE_CLASS

(

unsharp

)

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 98 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 156 of file vf_unsharp.c.

Referenced by init().

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

static

Definition at line 168 of file vf_unsharp.c.

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 190 of file vf_unsharp.c.

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

static

Definition at line 203 of file vf_unsharp.c.

Referenced by config_props().

static int config_props ( AVFilterLink *  link )

static

Definition at line 225 of file vf_unsharp.c.

static void free_filter_param ( FilterParam *  fp )

static

Definition at line 244 of file vf_unsharp.c.

Referenced by uninit().

static av_cold void uninit ( AVFilterContext *  ctx )

static

Definition at line 252 of file vf_unsharp.c.

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

static

Definition at line 261 of file vf_unsharp.c.

Variable Documentation

const AVOption unsharp_options[]

static

Initial value:

= {
    { "luma_msize_x",    "set luma matrix x size",     OFFSET(luma_msize_x),    AV_OPT_TYPE_INT,    {.i64=5}, 3, 63 },
    { "lx",              "set luma matrix x size",     OFFSET(luma_msize_x),    AV_OPT_TYPE_INT,    {.i64=5}, 3, 63 },
    { "luma_msize_y",    "set luma matrix y size",     OFFSET(luma_msize_y),    AV_OPT_TYPE_INT,    {.i64=5}, 3, 63 },
    { "ly",              "set luma matrix y size",     OFFSET(luma_msize_y),    AV_OPT_TYPE_INT,    {.i64=5}, 3, 63 },
    { "luma_amount",     "set luma effect amount",     OFFSET(luma_amount),     AV_OPT_TYPE_DOUBLE, {.dbl=1.0}, -DBL_MAX, DBL_MAX },
    { "la",              "set luma effect amount",     OFFSET(luma_amount),     AV_OPT_TYPE_DOUBLE, {.dbl=1.0}, -DBL_MAX, DBL_MAX },

    { "chroma_msize_x",  "set chroma matrix x size",   OFFSET(chroma_msize_x), AV_OPT_TYPE_INT,    {.i64=5}, 3, 63 },
    { "cx",              "set chroma matrix x size",   OFFSET(chroma_msize_x), AV_OPT_TYPE_INT,    {.i64=5}, 3, 63 },
    { "chroma_msize_y",  "set chroma matrix y size",   OFFSET(chroma_msize_y), AV_OPT_TYPE_INT,    {.i64=5}, 3, 63 },
    { "cy"          ,    "set chroma matrix y size",   OFFSET(chroma_msize_y), AV_OPT_TYPE_INT,    {.i64=5}, 3, 63 },
    { "chroma_amount",   "set chroma effect strenght", OFFSET(chroma_amount),  AV_OPT_TYPE_DOUBLE, {.dbl=0.0}, -DBL_MAX, DBL_MAX },
    { "ca",              "set chroma effect strenght", OFFSET(chroma_amount),  AV_OPT_TYPE_DOUBLE, {.dbl=0.0}, -DBL_MAX, DBL_MAX },

    { NULL }
}

Definition at line 78 of file vf_unsharp.c.

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 284 of file vf_unsharp.c.

const AVFilterPad avfilter_vf_unsharp_outputs[]

static

Initial value:

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

Definition at line 295 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,

    .priv_class = &unsharp_class,
}

Definition at line 303 of file vf_unsharp.c.