vf_gradfun.c File Reference

gradfun debanding filter, ported from MPlayer libmpcodecs/vf_gradfun.c More...

#include "libavutil/imgutils.h"
#include "libavutil/common.h"
#include "libavutil/cpu.h"
#include "libavutil/pixdesc.h"
#include "libavutil/opt.h"
#include "avfilter.h"
#include "formats.h"
#include "gradfun.h"
#include "internal.h"
#include "video.h"

Go to the source code of this file.

Macros
#define	OFFSET(x)   offsetof(GradFunContext, x)
#define	F   AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Functions
	AVFILTER_DEFINE_CLASS (gradfun)
void	ff_gradfun_filter_line_c (uint8_t *dst, const uint8_t *src, const uint16_t *dc, int width, int thresh, const uint16_t *dithers)
void	ff_gradfun_blur_line_c (uint16_t *dc, uint16_t *buf, const uint16_t *buf1, const uint8_t *src, int src_linesize, int width)
static void	filter (GradFunContext *ctx, uint8_t *dst, const uint8_t *src, int width, int height, int dst_linesize, int src_linesize, int r)
static av_cold int	init (AVFilterContext *ctx, const char *args)
static av_cold void	uninit (AVFilterContext *ctx)
static int	query_formats (AVFilterContext *ctx)
static int	config_input (AVFilterLink *inlink)
static int	filter_frame (AVFilterLink *inlink, AVFilterBufferRef *in)

Variables
static const AVOption	gradfun_options []
static const uint16_t	dither [8][8]
static const AVFilterPad	avfilter_vf_gradfun_inputs []
static const AVFilterPad	avfilter_vf_gradfun_outputs []
AVFilter	avfilter_vf_gradfun

Detailed Description

gradfun debanding filter, ported from MPlayer libmpcodecs/vf_gradfun.c

Apply a boxblur debanding algorithm (based on the gradfun2db Avisynth filter by prunedtree). Foreach pixel, if it's within threshold of the blurred value, make it closer. So now we have a smoothed and higher bitdepth version of all the shallow gradients, while leaving detailed areas untouched. Dither it back to 8bit.

Definition in file vf_gradfun.c.

Macro Definition Documentation

#define OFFSET

(

x

)

offsetof(GradFunContext, x)

Definition at line 46 of file vf_gradfun.c.

#define F   AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 47 of file vf_gradfun.c.

Function Documentation

AVFILTER_DEFINE_CLASS

(

gradfun

)

void ff_gradfun_filter_line_c	(	uint8_t *	dst,
		const uint8_t *	src,
		const uint16_t *	dc,
		int	width,
		int	thresh,
		const uint16_t *	dithers
	)

Definition at line 68 of file vf_gradfun.c.

Referenced by init().

void ff_gradfun_blur_line_c	(	uint16_t *	dc,
		uint16_t *	buf,
		const uint16_t *	buf1,
		const uint8_t *	src,
		int	src_linesize,
		int	width
	)

Definition at line 82 of file vf_gradfun.c.

Referenced by init().

static void filter ( GradFunContext *  ctx, uint8_t *  dst, const uint8_t *  src, int  width, int  height, int  dst_linesize, int  src_linesize, int  r  )

static

Definition at line 93 of file vf_gradfun.c.

Referenced by filter_frame().

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

static

Definition at line 134 of file vf_gradfun.c.

static av_cold void uninit ( AVFilterContext *  ctx )

static

Definition at line 160 of file vf_gradfun.c.

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 166 of file vf_gradfun.c.

static int config_input ( AVFilterLink *  inlink )

static

Definition at line 182 of file vf_gradfun.c.

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

static

Definition at line 200 of file vf_gradfun.c.

Variable Documentation

const AVOption gradfun_options[]

static

Initial value:

= {
    { "strength", "set the maximum amount by which the filter will change any one pixel", OFFSET(strength), AV_OPT_TYPE_DOUBLE, {.dbl = 1.2}, 0.51, 64, F },
    { "radius",   "set the neighborhood to fit the gradient to",                          OFFSET(radius),   AV_OPT_TYPE_INT,    {.i64 =  16},    4, 32, F },
    { NULL }
}

Definition at line 49 of file vf_gradfun.c.

const uint16_t dither[8][8]

static

Initial value:

= {
    {0x00,0x60,0x18,0x78,0x06,0x66,0x1E,0x7E},
    {0x40,0x20,0x58,0x38,0x46,0x26,0x5E,0x3E},
    {0x10,0x70,0x08,0x68,0x16,0x76,0x0E,0x6E},
    {0x50,0x30,0x48,0x28,0x56,0x36,0x4E,0x2E},
    {0x04,0x64,0x1C,0x7C,0x02,0x62,0x1A,0x7A},
    {0x44,0x24,0x5C,0x3C,0x42,0x22,0x5A,0x3A},
    {0x14,0x74,0x0C,0x6C,0x12,0x72,0x0A,0x6A},
    {0x54,0x34,0x4C,0x2C,0x52,0x32,0x4A,0x2A},
}

Definition at line 57 of file vf_gradfun.c.

Referenced by filter().

const AVFilterPad avfilter_vf_gradfun_inputs[]

static

Initial value:

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

Definition at line 241 of file vf_gradfun.c.

const AVFilterPad avfilter_vf_gradfun_outputs[]

static

Initial value:

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

Definition at line 252 of file vf_gradfun.c.

AVFilter avfilter_vf_gradfun

Initial value:

= {
    .name          = "gradfun",
    .description   = NULL_IF_CONFIG_SMALL("Debands video quickly using gradients."),
    .priv_size     = sizeof(GradFunContext),
    .init          = init,
    .uninit        = uninit,
    .query_formats = query_formats,
    .inputs        = avfilter_vf_gradfun_inputs,
    .outputs       = avfilter_vf_gradfun_outputs,
    .priv_class    = &gradfun_class,
}

Definition at line 260 of file vf_gradfun.c.