vf_paletteuse.c File Reference

Use a palette to downsample an input video stream. More...

#include "libavutil/bprint.h"
#include "libavutil/internal.h"
#include "libavutil/opt.h"
#include "libavutil/qsort.h"
#include "avfilter.h"
#include "filters.h"
#include "framesync.h"
#include "internal.h"

Classes
struct	color_node
struct	cached_color
struct	cache_node
struct	PaletteUseContext
struct	nearest_color
struct	stack_node
struct	color
struct	color_rect

Macros
#define	NBITS   5
#define	CACHE_SIZE   (1<<(3*NBITS))
#define	OFFSET(x)   offsetof(PaletteUseContext, x)
#define	FLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
#define	COLORMAP_NEAREST(search, palette, root, target, trans_thresh)
#define	INDENT   4
#define	DECLARE_CMP_FUNC(name, pos)
#define	DEFINE_SET_FRAME(color_search, name, value)
#define	DEFINE_SET_FRAME_COLOR_SEARCH(color_search, color_search_macro)
#define	DITHERING_ENTRIES(color_search)

Typedefs
typedef int(*	set_frame_func) (struct PaletteUseContext *s, AVFrame *out, AVFrame *in, int x_start, int y_start, int width, int height)
typedef struct PaletteUseContext	PaletteUseContext
typedef int(*	cmp_func) (const void *, const void *)

Enumerations
enum	dithering_mode {   DITHERING_NONE, DITHERING_BAYER, DITHERING_HECKBERT, DITHERING_FLOYD_STEINBERG,   DITHERING_SIERRA2, DITHERING_SIERRA2_4A, NB_DITHERING }
enum	color_search_method { COLOR_SEARCH_NNS_ITERATIVE, COLOR_SEARCH_NNS_RECURSIVE, COLOR_SEARCH_BRUTEFORCE, NB_COLOR_SEARCHES }
enum	diff_mode { DIFF_MODE_NONE, DIFF_MODE_RECTANGLE, NB_DIFF_MODE }

Functions
	AVFILTER_DEFINE_CLASS (paletteuse)

Variables
AVFilter	ff_vf_paletteuse

Detailed Description

Use a palette to downsample an input video stream.

Macro Definition Documentation

COLORMAP_NEAREST

#define COLORMAP_NEAREST	(		search,
			palette,
			root,
			target,
			trans_thresh
	)

Value:

search == COLOR_SEARCH_NNS_ITERATIVE ? colormap_nearest_iterative(root, target, trans_thresh) :      \
    search == COLOR_SEARCH_NNS_RECURSIVE ? colormap_nearest_recursive(root, target, trans_thresh) :      \
                                           colormap_nearest_bruteforce(palette, target, trans_thresh)

DECLARE_CMP_FUNC

#define DECLARE_CMP_FUNC	(		name,
			pos
	)

Value:

static int cmp_##name(const void *pa, const void *pb)   \
{                                                       \
    const struct color *a = pa;                         \
    const struct color *b = pb;                         \
    return   (a->value >> (8 * (3 - (pos))) & 0xff)     \
           - (b->value >> (8 * (3 - (pos))) & 0xff);    \
}

DEFINE_SET_FRAME

#define DEFINE_SET_FRAME	(		color_search,
			name,
			value
	)

Value:

static int set_frame_##name(PaletteUseContext *s, AVFrame *out, AVFrame *in,    \
                            int x_start, int y_start, int w, int h)             \
{                                                                               \
    return set_frame(s, out, in, x_start, y_start, w, h, value, color_search);  \
}

DEFINE_SET_FRAME_COLOR_SEARCH

#define DEFINE_SET_FRAME_COLOR_SEARCH	(		color_search,
			color_search_macro
	)

Value:

DEFINE_SET_FRAME(color_search_macro, color_search##_##none,            DITHERING_NONE)              \
    DEFINE_SET_FRAME(color_search_macro, color_search##_##bayer,           DITHERING_BAYER)             \
    DEFINE_SET_FRAME(color_search_macro, color_search##_##heckbert,        DITHERING_HECKBERT)          \
    DEFINE_SET_FRAME(color_search_macro, color_search##_##floyd_steinberg, DITHERING_FLOYD_STEINBERG)   \
    DEFINE_SET_FRAME(color_search_macro, color_search##_##sierra2,         DITHERING_SIERRA2)           \
    DEFINE_SET_FRAME(color_search_macro, color_search##_##sierra2_4a,      DITHERING_SIERRA2_4A)        \

DITHERING_ENTRIES

#define DITHERING_ENTRIES

(

color_search

)

Value:

{       \
    set_frame_##color_search##_none,            \
    set_frame_##color_search##_bayer,           \
    set_frame_##color_search##_heckbert,        \
    set_frame_##color_search##_floyd_steinberg, \
    set_frame_##color_search##_sierra2,         \
    set_frame_##color_search##_sierra2_4a,      \
}

Variable Documentation

ff_vf_paletteuse

AVFilter ff_vf_paletteuse

Initial value:

= {
    .name          = "paletteuse",
    .description   = NULL_IF_CONFIG_SMALL("Use a palette to downsample an input video stream."),
    .priv_size     = sizeof(PaletteUseContext),
    .query_formats = query_formats,
    .init          = init,
    .uninit        = uninit,
    .activate      = activate,
    .inputs        = paletteuse_inputs,
    .outputs       = paletteuse_outputs,
    .priv_class    = &paletteuse_class,
}