vf_chromakey.c File Reference

#include "libavutil/opt.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/pixdesc.h"
#include "avfilter.h"
#include "filters.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|AV_OPT_FLAG_RUNTIME_PARAM

Functions
static uint8_t	do_chromakey_pixel (ChromakeyContext *ctx, uint8_t u[9], uint8_t v[9])
static uint16_t	do_chromakey_pixel16 (ChromakeyContext *ctx, uint16_t u[9], uint16_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 av_always_inline void	get_pixel16_uv (AVFrame *frame, int hsub_log2, int vsub_log2, int x, int y, uint16_t *u, uint16_t *v)
static int	do_chromakey_slice (AVFilterContext *avctx, void *arg, int jobnr, int nb_jobs)
static int	do_chromakey16_slice (AVFilterContext *avctx, void *arg, int jobnr, int nb_jobs)
static int	do_chromahold_slice (AVFilterContext *avctx, void *arg, int jobnr, int nb_jobs)
static int	do_chromahold16_slice (AVFilterContext *avctx, void *arg, int jobnr, int nb_jobs)
static int	filter_frame (AVFilterLink *link, AVFrame *frame)
static av_cold int	config_output (AVFilterLink *outlink)
static av_cold int	config_input (AVFilterLink *inlink)
static int	process_command (AVFilterContext *ctx, const char *cmd, const char *args, char *res, int res_len, int flags)
	AVFILTER_DEFINE_CLASS (chromakey)
	AVFILTER_DEFINE_CLASS (chromahold)

Variables
static const AVFilterPad	inputs []
static const AVFilterPad	outputs []
static const AVOption	chromakey_options []
static enum AVPixelFormat	chromakey_fmts []
const AVFilter	ff_vf_chromakey
static const AVOption	chromahold_options []
static enum AVPixelFormat	hold_pixel_fmts []
const AVFilter	ff_vf_chromahold

Macro Definition Documentation

FIXNUM

#define FIXNUM

(

x

)

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

Definition at line 268 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 269 of file vf_chromakey.c.

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 270 of file vf_chromakey.c.

OFFSET

#define OFFSET

(

x

)

offsetof(ChromakeyContext, x)

Definition at line 344 of file vf_chromakey.c.

FLAGS

#define FLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM

Definition at line 345 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 48 of file vf_chromakey.c.

Referenced by do_chromakey_slice().

do_chromakey_pixel16()

static uint16_t do_chromakey_pixel16 ( ChromakeyContext *  ctx, uint16_t  u[9], uint16_t  v[9]  )

static

Definition at line 69 of file vf_chromakey.c.

Referenced by do_chromakey16_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 91 of file vf_chromakey.c.

Referenced by do_chromakey_slice().

get_pixel16_uv()

static av_always_inline void get_pixel16_uv ( AVFrame *  frame, int  hsub_log2, int  vsub_log2, int  x, int  y, uint16_t *  u, uint16_t *  v  )

static

Definition at line 103 of file vf_chromakey.c.

Referenced by do_chromakey16_slice().

do_chromakey_slice()

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

static

Definition at line 115 of file vf_chromakey.c.

Referenced by config_output().

do_chromakey16_slice()

static int do_chromakey16_slice ( AVFilterContext *  avctx, void *  arg, int  jobnr, int  nb_jobs  )

static

Definition at line 145 of file vf_chromakey.c.

Referenced by config_output().

do_chromahold_slice()

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

static

Definition at line 179 of file vf_chromakey.c.

Referenced by config_output().

do_chromahold16_slice()

static int do_chromahold16_slice ( AVFilterContext *  avctx, void *  arg, int  jobnr, int  nb_jobs  )

static

Definition at line 216 of file vf_chromakey.c.

Referenced by config_output().

filter_frame()

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

static

Definition at line 255 of file vf_chromakey.c.

config_output()

static av_cold int config_output ( AVFilterLink *  outlink )

static

Definition at line 272 of file vf_chromakey.c.

Referenced by process_command().

config_input()

static av_cold int config_input ( AVFilterLink *  inlink )

static

Definition at line 302 of file vf_chromakey.c.

process_command()

static int process_command ( AVFilterContext *  ctx, const char *  cmd, const char *  args, char *  res, int  res_len, int  flags  )

static

Definition at line 314 of file vf_chromakey.c.

AVFILTER_DEFINE_CLASS() [1/2]

AVFILTER_DEFINE_CLASS

(

chromakey

)

AVFILTER_DEFINE_CLASS() [2/2]

AVFILTER_DEFINE_CLASS

(

chromahold

)

Variable Documentation

inputs

const AVFilterPad inputs[]

static

Initial value:

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

Definition at line 326 of file vf_chromakey.c.

outputs

const AVFilterPad outputs[]

static

Initial value:

= {
    {
        .name           = "default",
        .type           = AVMEDIA_TYPE_VIDEO,
        .config_props   = config_output,
    },
}

Definition at line 336 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" }, 0, 0, FLAGS },
    { "similarity", "set the chromakey similarity value", OFFSET(similarity), AV_OPT_TYPE_FLOAT, { .dbl = 0.01 }, 0.00001, 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 347 of file vf_chromakey.c.

chromakey_fmts

enum AVPixelFormat chromakey_fmts[]

static

Initial value:

= {
    AV_PIX_FMT_YUVA420P,
    AV_PIX_FMT_YUVA422P,
    AV_PIX_FMT_YUVA444P,
    AV_PIX_FMT_YUVA420P9,  AV_PIX_FMT_YUVA422P9,  AV_PIX_FMT_YUVA444P9,
    AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,
    AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA444P12,
    AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,
    AV_PIX_FMT_NONE
}

Definition at line 355 of file vf_chromakey.c.

ff_vf_chromakey

const 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,
    FILTER_INPUTS(inputs),
    FILTER_OUTPUTS(outputs),
    FILTER_PIXFMTS_ARRAY(chromakey_fmts),
    .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
    .process_command = process_command,
}

Definition at line 368 of file vf_chromakey.c.

chromahold_options

const AVOption chromahold_options[]

static

Initial value:

= {
    { "color", "set the chromahold key color", OFFSET(chromakey_rgba), AV_OPT_TYPE_COLOR, { .str = "black" }, 0, 0, FLAGS },
    { "similarity", "set the chromahold similarity value", OFFSET(similarity), AV_OPT_TYPE_FLOAT, { .dbl = 0.01 }, 0.00001, 1.0, FLAGS },
    { "blend", "set the chromahold 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 380 of file vf_chromakey.c.

hold_pixel_fmts

enum AVPixelFormat hold_pixel_fmts[]

static

Initial value:

= {
    AV_PIX_FMT_YUV420P,
    AV_PIX_FMT_YUV422P,
    AV_PIX_FMT_YUV444P,
    AV_PIX_FMT_YUVA420P,
    AV_PIX_FMT_YUVA422P,
    AV_PIX_FMT_YUVA444P,
    AV_PIX_FMT_YUV420P9,   AV_PIX_FMT_YUV422P9,   AV_PIX_FMT_YUV444P9,
    AV_PIX_FMT_YUV420P10,  AV_PIX_FMT_YUV422P10,  AV_PIX_FMT_YUV444P10,
    AV_PIX_FMT_YUV444P12,  AV_PIX_FMT_YUV422P12,  AV_PIX_FMT_YUV420P12,
    AV_PIX_FMT_YUV444P14,  AV_PIX_FMT_YUV422P14,  AV_PIX_FMT_YUV420P14,
    AV_PIX_FMT_YUV420P16,  AV_PIX_FMT_YUV422P16,  AV_PIX_FMT_YUV444P16,
    AV_PIX_FMT_YUVA420P9,  AV_PIX_FMT_YUVA422P9,  AV_PIX_FMT_YUVA444P9,
    AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,
    AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA444P12,
    AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,
    AV_PIX_FMT_NONE
}

Definition at line 388 of file vf_chromakey.c.

ff_vf_chromahold

const AVFilter ff_vf_chromahold

Initial value:

= {
    .name          = "chromahold",
    .description   = NULL_IF_CONFIG_SMALL("Turns a certain color range into gray."),
    .priv_size     = sizeof(ChromakeyContext),
    .priv_class    = &chromahold_class,
    FILTER_INPUTS(inputs),
    FILTER_OUTPUTS(outputs),
    FILTER_PIXFMTS_ARRAY(hold_pixel_fmts),
    .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
    .process_command = process_command,
}

Definition at line 409 of file vf_chromakey.c.