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"

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

Functions
	DECLARE_ALIGNED (16, static const uint16_t, dither)[8][8]
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)
	AVFILTER_DEFINE_CLASS (gradfun)

Variables
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.

Variable Documentation

ff_vf_gradfun

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,
}