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/opt.h"
#include "libavutil/pixdesc.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	FLAGS   AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Functions
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)
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, AVFrame *in)
	AVFILTER_DEFINE_CLASS (gradfun)

Variables
static const uint16_t	dither [8][8]
static const AVOption	gradfun_options []
static const AVFilterPad	avfilter_vf_gradfun_inputs []
static const AVFilterPad	avfilter_vf_gradfun_outputs []
AVFilter	ff_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). For each pixel, if it is within the 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 225 of file vf_gradfun.c.

#define FLAGS   AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 226 of file vf_gradfun.c.

Function Documentation

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 57 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 71 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 82 of file vf_gradfun.c.

Referenced by filter_frame().

static av_cold int init ( AVFilterContext *  ctx )

static

Definition at line 124 of file vf_gradfun.c.

static av_cold void uninit ( AVFilterContext *  ctx )

static

Definition at line 142 of file vf_gradfun.c.

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 148 of file vf_gradfun.c.

static int config_input ( AVFilterLink *  inlink )

static

Definition at line 164 of file vf_gradfun.c.

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

static

Definition at line 183 of file vf_gradfun.c.

AVFILTER_DEFINE_CLASS

(

gradfun

)

Variable Documentation

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 46 of file vf_gradfun.c.

Referenced by filter().

const AVOption gradfun_options[]

static

Initial value:

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

Definition at line 228 of file vf_gradfun.c.

const AVFilterPad avfilter_vf_gradfun_inputs[]

static

Initial value:

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

Definition at line 236 of file vf_gradfun.c.

const AVFilterPad avfilter_vf_gradfun_outputs[]

static

Initial value:

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

Definition at line 246 of file vf_gradfun.c.

AVFilter ff_vf_gradfun

Initial value:

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

Definition at line 254 of file vf_gradfun.c.