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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
 

Functions

void ff_gradfun_filter_line_c (uint8_t *dst, uint8_t *src, uint16_t *dc, int width, int thresh, const uint16_t *dithers)
 
void ff_gradfun_blur_line_c (uint16_t *dc, uint16_t *buf, uint16_t *buf1, uint8_t *src, int src_linesize, int width)
 
static void filter (GradFunContext *ctx, uint8_t *dst, 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)
 

Variables

static const uint16_t dither [8][8]
 
static const AVOption options []
 
static const AVClass gradfun_class
 
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

◆ OFFSET

#define OFFSET (   x)    offsetof(GradFunContext, x)

Definition at line 227 of file vf_gradfun.c.

◆ FLAGS

#define FLAGS   AV_OPT_FLAG_VIDEO_PARAM

Definition at line 228 of file vf_gradfun.c.

Function Documentation

◆ ff_gradfun_filter_line_c()

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

Definition at line 57 of file vf_gradfun.c.

Referenced by init().

◆ ff_gradfun_blur_line_c()

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

Definition at line 71 of file vf_gradfun.c.

Referenced by init().

◆ filter()

static void filter ( GradFunContext ctx,
uint8_t dst,
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().

◆ init()

static av_cold int init ( AVFilterContext ctx)
static

Definition at line 124 of file vf_gradfun.c.

◆ uninit()

static av_cold void uninit ( AVFilterContext ctx)
static

Definition at line 142 of file vf_gradfun.c.

◆ query_formats()

static int query_formats ( AVFilterContext ctx)
static

Definition at line 148 of file vf_gradfun.c.

◆ config_input()

static int config_input ( AVFilterLink inlink)
static

Definition at line 163 of file vf_gradfun.c.

◆ filter_frame()

static int filter_frame ( AVFilterLink inlink,
AVFrame in 
)
static

Definition at line 182 of file vf_gradfun.c.

Variable Documentation

◆ dither

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 ac3_decode_transform_coeffs_ch(), filter(), quantize_triangular_ns(), render_charset(), and rv40_loop_filter().

◆ options

const AVOption 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 },
}
NULL
Definition: eval.c:55
#define FLAGS
Definition: vf_gradfun.c:228
#define OFFSET(x)
Definition: vf_gradfun.c:227

Definition at line 229 of file vf_gradfun.c.

◆ gradfun_class

const AVClass gradfun_class
static
Initial value:
= {
.class_name = "gradfun",
.item_name = av_default_item_name,
.option = options,
}
LIBAVUTIL_VERSION_INT
Definition: eval.c:55
static const AVOption options[]
Definition: vf_gradfun.c:229
av_default_item_name
Definition: dnxhdenc.c:55

Definition at line 235 of file vf_gradfun.c.

◆ avfilter_vf_gradfun_inputs

const AVFilterPad avfilter_vf_gradfun_inputs[]
static
Initial value:
= {
{
.name = "default",
.config_props = config_input,
.filter_frame = filter_frame,
},
{ NULL }
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
Definition: vf_gradfun.c:182
static int config_input(AVFilterLink *inlink)
Definition: vf_gradfun.c:163
NULL
Definition: eval.c:55

Definition at line 242 of file vf_gradfun.c.

◆ avfilter_vf_gradfun_outputs

const AVFilterPad avfilter_vf_gradfun_outputs[]
static
Initial value:
= {
{
.name = "default",
},
{ NULL }
}
NULL
Definition: eval.c:55

Definition at line 252 of file vf_gradfun.c.

◆ 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,
}
static const AVFilterPad outputs[]
Definition: af_ashowinfo.c:259
Holds instance-specific information for gradfun.
Definition: gradfun.h:28
static const AVClass gradfun_class
Definition: vf_gradfun.c:235
static const AVFilterPad avfilter_vf_gradfun_outputs[]
Definition: vf_gradfun.c:252
static av_cold void uninit(AVFilterContext *ctx)
Definition: vf_gradfun.c:142
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:148
static av_cold int init(AVFilterContext *ctx)
Definition: vf_gradfun.c:124
static const AVFilterPad inputs[]
Definition: af_ashowinfo.c:248
static const AVFilterPad avfilter_vf_gradfun_inputs[]
Definition: vf_gradfun.c:242
static int query_formats(AVFilterContext *ctx)
Definition: vf_gradfun.c:148

Definition at line 260 of file vf_gradfun.c.