vf_chromakey.c File Reference

#include "libavutil/opt.h"
#include "libavutil/imgutils.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"

Go to the source code of this file.

Data Structures
struct	ChromakeyContext

Macros
#define	FIXNUM(x)   lrint((x) * (1 << 10))
#define	RGB_TO_U(rgb)   (((- FIXNUM(0.16874) * rgb[0] - FIXNUM(0.33126) * rgb[1] + FIXNUM(0.50000) * rgb[2] + (1 << 9) - 1) >> 10) + 128)
#define	RGB_TO_V(rgb)   ((( FIXNUM(0.50000) * rgb[0] - FIXNUM(0.41869) * rgb[1] - FIXNUM(0.08131) * rgb[2] + (1 << 9) - 1) >> 10) + 128)
#define	OFFSET(x)   offsetof(ChromakeyContext, x)
#define	FLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

Functions
static uint8_t	do_chromakey_pixel (ChromakeyContext *ctx, uint8_t u[9], uint8_t v[9])
static av_always_inline void	get_pixel_uv (AVFrame *frame, int hsub_log2, int vsub_log2, int x, int y, uint8_t *u, uint8_t *v)
static int	do_chromakey_slice (AVFilterContext *avctx, void *arg, int jobnr, int nb_jobs)
static int	filter_frame (AVFilterLink *link, AVFrame *frame)
static av_cold int	initialize_chromakey (AVFilterContext *avctx)
static av_cold int	query_formats (AVFilterContext *avctx)
static av_cold int	config_input (AVFilterLink *inlink)
	AVFILTER_DEFINE_CLASS (chromakey)

Variables
static const AVFilterPad	chromakey_inputs []
static const AVFilterPad	chromakey_outputs []
static const AVOption	chromakey_options []
AVFilter	ff_vf_chromakey

Macro Definition Documentation

FIXNUM

#define FIXNUM

(

x

)

lrint((x) * (1 << 10))

Definition at line 117 of file vf_chromakey.c.

RGB_TO_U

#define RGB_TO_U

(

rgb

)

(((- FIXNUM(0.16874) * rgb[0] - FIXNUM(0.33126) * rgb[1] + FIXNUM(0.50000) * rgb[2] + (1 << 9) - 1) >> 10) + 128)

Definition at line 118 of file vf_chromakey.c.

Referenced by initialize_chromakey().

RGB_TO_V

#define RGB_TO_V

(

rgb

)

((( FIXNUM(0.50000) * rgb[0] - FIXNUM(0.41869) * rgb[1] - FIXNUM(0.08131) * rgb[2] + (1 << 9) - 1) >> 10) + 128)

Definition at line 119 of file vf_chromakey.c.

Referenced by initialize_chromakey().

OFFSET

#define OFFSET

(

x

)

offsetof(ChromakeyContext, x)

Definition at line 185 of file vf_chromakey.c.

FLAGS

#define FLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

Definition at line 186 of file vf_chromakey.c.

Function Documentation

do_chromakey_pixel()

static uint8_t do_chromakey_pixel ( ChromakeyContext *  ctx, uint8_t  u[9], uint8_t  v[9]  )

static

Definition at line 43 of file vf_chromakey.c.

Referenced by do_chromakey_slice().

get_pixel_uv()

static av_always_inline void get_pixel_uv ( AVFrame *  frame, int  hsub_log2, int  vsub_log2, int  x, int  y, uint8_t *  u, uint8_t *  v  )

static

Definition at line 64 of file vf_chromakey.c.

Referenced by do_chromakey_slice().

do_chromakey_slice()

static int do_chromakey_slice ( AVFilterContext *  avctx, void *  arg, int  jobnr, int  nb_jobs  )

static

Definition at line 76 of file vf_chromakey.c.

Referenced by filter_frame().

filter_frame()

static int filter_frame ( AVFilterLink *  link, AVFrame *  frame  )

static

Definition at line 106 of file vf_chromakey.c.

initialize_chromakey()

static av_cold int initialize_chromakey ( AVFilterContext *  avctx )

static

Definition at line 121 of file vf_chromakey.c.

query_formats()

static av_cold int query_formats ( AVFilterContext *  avctx )

static

Definition at line 136 of file vf_chromakey.c.

config_input()

static av_cold int config_input ( AVFilterLink *  inlink )

static

Definition at line 154 of file vf_chromakey.c.

AVFILTER_DEFINE_CLASS()

AVFILTER_DEFINE_CLASS

(

chromakey

)

Variable Documentation

chromakey_inputs

const AVFilterPad chromakey_inputs[]

static

Initial value:

= {
    {
        .name           = "default",
        .type           = AVMEDIA_TYPE_VIDEO,
        .needs_writable = 1,
        .filter_frame   = filter_frame,
        .config_props   = config_input,
    },
    { NULL }
}

Definition at line 166 of file vf_chromakey.c.

chromakey_outputs

const AVFilterPad chromakey_outputs[]

static

Initial value:

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

Definition at line 177 of file vf_chromakey.c.

chromakey_options

const AVOption chromakey_options[]

static

Initial value:

= {
    { "color", "set the chromakey key color", OFFSET(chromakey_rgba), AV_OPT_TYPE_COLOR, { .str = "black" }, CHAR_MIN, CHAR_MAX, FLAGS },
    { "similarity", "set the chromakey similarity value", OFFSET(similarity), AV_OPT_TYPE_FLOAT, { .dbl = 0.01 }, 0.01, 1.0, FLAGS },
    { "blend", "set the chromakey key blend value", OFFSET(blend), AV_OPT_TYPE_FLOAT, { .dbl = 0.0 }, 0.0, 1.0, FLAGS },
    { "yuv", "color parameter is in yuv instead of rgb", OFFSET(is_yuv), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
    { NULL }
}

Definition at line 188 of file vf_chromakey.c.

ff_vf_chromakey

AVFilter ff_vf_chromakey

Initial value:

= {
    .name          = "chromakey",
    .description   = NULL_IF_CONFIG_SMALL("Turns a certain color into transparency. Operates on YUV colors."),
    .priv_size     = sizeof(ChromakeyContext),
    .priv_class    = &chromakey_class,
    .init          = initialize_chromakey,
    .query_formats = query_formats,
    .inputs        = chromakey_inputs,
    .outputs       = chromakey_outputs,
    .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
}

Definition at line 198 of file vf_chromakey.c.