#include "libavutil/avassert.h"
#include "libavutil/eval.h"
#include "libavutil/opt.h"
#include "internal.h"

Data Structures
struct	DCTdnoizContext

struct	ThreadData
	Used for passing data between threads. More...

Macros
#define	MAX_THREADS 8

#define	MIN_NBITS 3 /* blocksize = 1<<3 = 8 */

#define	MAX_NBITS 4 /* blocksize = 1<<4 = 16 */

#define	DEFAULT_NBITS 3

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

#define	FLAGS AV_OPT_FLAG_FILTERING_PARAM\|AV_OPT_FLAG_VIDEO_PARAM

#define	DEF_FILTER_FREQ_FUNCS(bsize)

#define	DCT3X3_0_0 0.5773502691896258f /* 1/sqrt(3) */

#define	DCT3X3_0_1 0.5773502691896258f /* 1/sqrt(3) */

#define	DCT3X3_0_2 0.5773502691896258f /* 1/sqrt(3) */

#define	DCT3X3_1_0 0.7071067811865475f /* 1/sqrt(2) */

#define	DCT3X3_1_2 -0.7071067811865475f /* -1/sqrt(2) */

#define	DCT3X3_2_0 0.4082482904638631f /* 1/sqrt(6) */

#define	DCT3X3_2_1 -0.8164965809277261f /* -2/sqrt(6) */

#define	DCT3X3_2_2 0.4082482904638631f /* 1/sqrt(6) */

#define	DECLARE_COLOR_FUNCS(name, r, g, b)

Enumerations
enum	{ VAR_C, VAR_VARS_NB }

Functions
	AVFILTER_DEFINE_CLASS (dctdnoiz)

static void av_always_inline	fdct8_1d (float dst, const float src, int dst_stridea, int dst_strideb, int src_stridea, int src_strideb)

static void av_always_inline	idct8_1d (float dst, const float src, int dst_stridea, int dst_strideb, int src_stridea, int src_strideb, int add)

static void av_always_inline	fdct16_1d (float dst, const float src, int dst_stridea, int dst_strideb, int src_stridea, int src_strideb)

static void av_always_inline	idct16_1d (float dst, const float src, int dst_stridea, int dst_strideb, int src_stridea, int src_strideb, int add)

static av_always_inline void	color_decorrelation (float dst, int dst_linesize, const uint8_t src, int src_linesize, int w, int h, int r, int g, int b)

static av_always_inline void	color_correlation (uint8_t dst, int dst_linesize, float src, int src_linesize, int w, int h, int r, int g, int b)

static av_always_inline void	color_decorrelation_gbrp (float dst, int dst_linesize, const uint8_t src, int src_linesize, int w, int h)

static av_always_inline void	color_correlation_gbrp (uint8_t dst, int dst_linesize, float src, int src_linesize, int w, int h)

static int	config_input (AVFilterLink *inlink)

static av_cold int	init (AVFilterContext *ctx)

static int	query_formats (AVFilterContext *ctx)

static int	filter_slice (AVFilterContext ctx, void arg, int jobnr, int nb_jobs)

static int	filter_frame (AVFilterLink inlink, AVFrame in)

static av_cold void	uninit (AVFilterContext *ctx)

Variables
static const char *const	var_names [] = { "c", NULL }
	A simple, relatively efficient and slow DCT image denoiser. More...

static const AVOption	dctdnoiz_options []

static const AVFilterPad	dctdnoiz_inputs []

static const AVFilterPad	dctdnoiz_outputs []

AVFilter	ff_vf_dctdnoiz

Macro Definition Documentation

◆ MAX_THREADS

#define MAX_THREADS 8

Definition at line 39 of file vf_dctdnoiz.c.

◆ MIN_NBITS

#define MIN_NBITS 3 /* blocksize = 1<<3 = 8 */

Definition at line 73 of file vf_dctdnoiz.c.

◆ MAX_NBITS

#define MAX_NBITS 4 /* blocksize = 1<<4 = 16 */

Definition at line 74 of file vf_dctdnoiz.c.

◆ DEFAULT_NBITS

#define DEFAULT_NBITS 3

Definition at line 75 of file vf_dctdnoiz.c.

◆ OFFSET

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

Definition at line 77 of file vf_dctdnoiz.c.

◆ FLAGS

#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

Definition at line 78 of file vf_dctdnoiz.c.

◆ DEF_FILTER_FREQ_FUNCS

#define DEF_FILTER_FREQ_FUNCS ( bsize )

Definition at line 352 of file vf_dctdnoiz.c.

◆ DCT3X3_0_0

#define DCT3X3_0_0 0.5773502691896258f /* 1/sqrt(3) */

Definition at line 401 of file vf_dctdnoiz.c.

◆ DCT3X3_0_1

#define DCT3X3_0_1 0.5773502691896258f /* 1/sqrt(3) */

Definition at line 402 of file vf_dctdnoiz.c.

◆ DCT3X3_0_2

#define DCT3X3_0_2 0.5773502691896258f /* 1/sqrt(3) */

Definition at line 403 of file vf_dctdnoiz.c.

◆ DCT3X3_1_0

#define DCT3X3_1_0 0.7071067811865475f /* 1/sqrt(2) */

Definition at line 404 of file vf_dctdnoiz.c.

◆ DCT3X3_1_2

#define DCT3X3_1_2 -0.7071067811865475f /* -1/sqrt(2) */

Definition at line 405 of file vf_dctdnoiz.c.

◆ DCT3X3_2_0

#define DCT3X3_2_0 0.4082482904638631f /* 1/sqrt(6) */

Definition at line 406 of file vf_dctdnoiz.c.

◆ DCT3X3_2_1

#define DCT3X3_2_1 -0.8164965809277261f /* -2/sqrt(6) */

Definition at line 407 of file vf_dctdnoiz.c.

◆ DCT3X3_2_2

#define DCT3X3_2_2 0.4082482904638631f /* 1/sqrt(6) */

Definition at line 408 of file vf_dctdnoiz.c.

◆ DECLARE_COLOR_FUNCS

#define DECLARE_COLOR_FUNCS	(	name,
		r,
		g,
		b
	)

Value:

static void color_decorrelation_##name(float **dst, int dst_linesize,               \
                                       const uint8_t **src, int src_linesize,       \
                                       int w, int h)                                \
{                                                                                   \
    color_decorrelation(dst, dst_linesize, src, src_linesize, w, h, r, g, b);       \
}                                                                                   \
                                                                                    \
static void color_correlation_##name(uint8_t **dst, int dst_linesize,               \
                                     float **src, int src_linesize,                 \
                                     int w, int h)                                  \
{                                                                                   \
    color_correlation(dst, dst_linesize, src, src_linesize, w, h, r, g, b);         \
}

Definition at line 460 of file vf_dctdnoiz.c.

Enumeration Type Documentation

◆ anonymous enum

anonymous enum

Enumerator
VAR_C
VAR_VARS_NB

Definition at line 37 of file vf_dctdnoiz.c.

Function Documentation

◆ AVFILTER_DEFINE_CLASS()

AVFILTER_DEFINE_CLASS ( dctdnoiz )

◆ fdct8_1d()

static void av_always_inline fdct8_1d	(	float *	dst,
		const float *	src,
		int	dst_stridea,
		int	dst_strideb,
		int	src_stridea,
		int	src_strideb
	)

static

Definition at line 91 of file vf_dctdnoiz.c.

◆ idct8_1d()

static void av_always_inline idct8_1d	(	float *	dst,
		const float *	src,
		int	dst_stridea,
		int	dst_strideb,
		int	src_stridea,
		int	src_strideb,
		int	add
	)

static

Definition at line 129 of file vf_dctdnoiz.c.

◆ fdct16_1d()

static void av_always_inline fdct16_1d	(	float *	dst,
		const float *	src,
		int	dst_stridea,
		int	dst_strideb,
		int	src_stridea,
		int	src_strideb
	)

static

Definition at line 173 of file vf_dctdnoiz.c.

◆ idct16_1d()

static void av_always_inline idct16_1d	(	float *	dst,
		const float *	src,
		int	dst_stridea,
		int	dst_strideb,
		int	src_stridea,
		int	src_strideb,
		int	add
	)

static

Definition at line 257 of file vf_dctdnoiz.c.

◆ color_decorrelation()

static av_always_inline void color_decorrelation	(	float **	dst,
		int	dst_linesize,
		const uint8_t **	src,
		int	src_linesize,
		int	w,
		int	h,
		int	r,
		int	g,
		int	b
	)

static

Definition at line 410 of file vf_dctdnoiz.c.

◆ color_correlation()

static av_always_inline void color_correlation	(	uint8_t **	dst,
		int	dst_linesize,
		float **	src,
		int	src_linesize,
		int	w,
		int	h,
		int	r,
		int	g,
		int	b
	)

static

Definition at line 435 of file vf_dctdnoiz.c.

◆ color_decorrelation_gbrp()

static av_always_inline void color_decorrelation_gbrp	(	float **	dst,
		int	dst_linesize,
		const uint8_t **	src,
		int	src_linesize,
		int	w,
		int	h
	)

static

Definition at line 478 of file vf_dctdnoiz.c.

Referenced by config_input().

◆ color_correlation_gbrp()

static av_always_inline void color_correlation_gbrp	(	uint8_t **	dst,
		int	dst_linesize,
		float **	src,
		int	src_linesize,
		int	w,
		int	h
	)

static

Definition at line 505 of file vf_dctdnoiz.c.

Referenced by config_input().

◆ config_input()

static int config_input ( AVFilterLink * inlink )

static

Definition at line 532 of file vf_dctdnoiz.c.

◆ init()

static av_cold int init ( AVFilterContext * ctx )

static

Definition at line 622 of file vf_dctdnoiz.c.

◆ query_formats()

static int query_formats ( AVFilterContext * ctx )

static

Definition at line 656 of file vf_dctdnoiz.c.

◆ filter_slice()

static int filter_slice	(	AVFilterContext *	ctx,
		void *	arg,
		int	jobnr,
		int	nb_jobs
	)

static

Definition at line 673 of file vf_dctdnoiz.c.

Referenced by filter_frame().

◆ filter_frame()

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

static

Definition at line 721 of file vf_dctdnoiz.c.

◆ uninit()

static av_cold void uninit ( AVFilterContext * ctx )

static

Definition at line 792 of file vf_dctdnoiz.c.

Variable Documentation

◆ var_names

const char* const var_names[] = { "c", NULL }

static

A simple, relatively efficient and slow DCT image denoiser.

See also: http://www.ipol.im/pub/art/2011/ys-dct/

The DCT factorization used is based on "Fast and numerically stable algorithms for discrete cosine transforms" from Gerlind Plonkaa & Manfred Tasche (DOI: 10.1016/j.laa.2004.07.015).

Definition at line 36 of file vf_dctdnoiz.c.

Referenced by config_input().

◆ dctdnoiz_options

const AVOption dctdnoiz_options[]

static

Initial value:

= {
    { "sigma",   "set noise sigma constant",               OFFSET(sigma),    AV_OPT_TYPE_FLOAT,  {.dbl=0},            0, 999,          .flags = FLAGS },
    { "s",       "set noise sigma constant",               OFFSET(sigma),    AV_OPT_TYPE_FLOAT,  {.dbl=0},            0, 999,          .flags = FLAGS },
    { "overlap", "set number of block overlapping pixels", OFFSET(overlap),  AV_OPT_TYPE_INT,    {.i64=-1}, -1, (1<<MAX_NBITS)-1, .flags = FLAGS },
    { "expr",    "set coefficient factor expression",      OFFSET(expr_str), AV_OPT_TYPE_STRING, {.str=NULL},                          .flags = FLAGS },
    { "e",       "set coefficient factor expression",      OFFSET(expr_str), AV_OPT_TYPE_STRING, {.str=NULL},                          .flags = FLAGS },
    { "n",       "set the block size, expressed in bits",  OFFSET(n),        AV_OPT_TYPE_INT,    {.i64=DEFAULT_NBITS}, MIN_NBITS, MAX_NBITS, .flags = FLAGS },
    { NULL }
}

Definition at line 79 of file vf_dctdnoiz.c.

◆ dctdnoiz_inputs

const AVFilterPad dctdnoiz_inputs[]

static

Initial value:

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

Definition at line 809 of file vf_dctdnoiz.c.

◆ dctdnoiz_outputs

const AVFilterPad dctdnoiz_outputs[]

static

Initial value:

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

Definition at line 819 of file vf_dctdnoiz.c.

◆ ff_vf_dctdnoiz

AVFilter ff_vf_dctdnoiz

Initial value:

= {
    .name          = "dctdnoiz",
    .description   = NULL_IF_CONFIG_SMALL("Denoise frames using 2D DCT."),
    .priv_size     = sizeof(DCTdnoizContext),
    .init          = init,
    .uninit        = uninit,
    .query_formats = query_formats,
    .inputs        = dctdnoiz_inputs,
    .outputs       = dctdnoiz_outputs,
    .priv_class    = &dctdnoiz_class,
    .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
}

Definition at line 827 of file vf_dctdnoiz.c.

Data Structures

Macros

Enumerations

Functions

Variables

Macro Definition Documentation

◆ MAX_THREADS

◆ MIN_NBITS

◆ MAX_NBITS

◆ DEFAULT_NBITS

◆ OFFSET

◆ FLAGS

◆ DEF_FILTER_FREQ_FUNCS

◆ DCT3X3_0_0

◆ DCT3X3_0_1

◆ DCT3X3_0_2

◆ DCT3X3_1_0

◆ DCT3X3_1_2

◆ DCT3X3_2_0

◆ DCT3X3_2_1

◆ DCT3X3_2_2

◆ DECLARE_COLOR_FUNCS

Enumeration Type Documentation

◆ anonymous enum

Function Documentation

◆ AVFILTER_DEFINE_CLASS()

◆ fdct8_1d()

◆ idct8_1d()

◆ fdct16_1d()

◆ idct16_1d()

◆ color_decorrelation()

◆ color_correlation()

◆ color_decorrelation_gbrp()

◆ color_correlation_gbrp()

◆ config_input()

◆ init()

◆ query_formats()

◆ filter_slice()

◆ filter_frame()

◆ uninit()

Variable Documentation

◆ var_names

◆ dctdnoiz_options

◆ dctdnoiz_inputs

◆ dctdnoiz_outputs

◆ ff_vf_dctdnoiz