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

Data Structures
struct	FilterParams
	filter data More...

struct	BlendContext

Macros
#define	TOP 0

#define	BOTTOM 1

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

#define	FLAGS AV_OPT_FLAG_FILTERING_PARAM\|AV_OPT_FLAG_VIDEO_PARAM

#define	DEFINE_BLEND(name, expr)

#define	A top[j]

#define	B bottom[j]

#define	MULTIPLY(x, a, b) (x * ((a * b) / 255))

#define	SCREEN(x, a, b) (255 - x * ((255 - a) * (255 - b) / 255))

#define	BURN(a, b) ((a == 0) ? a : FFMAX(0, 255 - ((255 - b) << 8) / a))

#define	DODGE(a, b) ((a == 255) ? a : FFMIN(255, ((b << 8) / (255 - a))))

Enumerations
enum	BlendMode { BLEND_UNSET = -1, BLEND_NORMAL, BLEND_ADDITION, BLEND_AND, BLEND_AVERAGE, BLEND_BURN, BLEND_DARKEN, BLEND_DIFFERENCE, BLEND_DIVIDE, BLEND_DODGE, BLEND_EXCLUSION, BLEND_HARDLIGHT, BLEND_LIGHTEN, BLEND_MULTIPLY, BLEND_NEGATION, BLEND_OR, BLEND_OVERLAY, BLEND_PHOENIX, BLEND_PINLIGHT, BLEND_REFLECT, BLEND_SCREEN, BLEND_SOFTLIGHT, BLEND_SUBTRACT, BLEND_VIVIDLIGHT, BLEND_XOR, BLEND_NB }

enum	{ VAR_X, VAR_Y, VAR_W, VAR_H, VAR_SW, VAR_SH, VAR_T, VAR_A, VAR_B, VAR_TOP, VAR_BOTTOM, VAR_VARS_NB }

Functions
	AVFILTER_DEFINE_CLASS (blend)

static void	blend_normal (const uint8_t top, int top_linesize, const uint8_t bottom, int bottom_linesize, uint8_t dst, int dst_linesize, int width, int height, FilterParams param)

	DEFINE_BLEND (overlay,(A< 128)?MULTIPLY(2, A, B):SCREEN(2, A, B))

static av_cold int	init (AVFilterContext ctx, const char args)

static int	query_formats (AVFilterContext *ctx)

static int	config_output (AVFilterLink *outlink)

static int	config_input_top (AVFilterLink *inlink)

static av_cold void	uninit (AVFilterContext *ctx)

static int	request_frame (AVFilterLink *outlink)

static void	blend_frame (AVFilterContext ctx, AVFilterBufferRef top_buf, AVFilterBufferRef bottom_buf, AVFilterBufferRef dst_buf)

static int	filter_frame (AVFilterLink inlink, AVFilterBufferRef buf)

Variables
static const char *const	var_names [] = { "X", "Y", "W", "H", "SW", "SH", "T", "A", "B", "TOP", "BOTTOM", NULL }

static const AVOption	blend_options []

static const AVFilterPad	blend_inputs []

static const AVFilterPad	blend_outputs []

AVFilter	avfilter_vf_blend

Macro Definition Documentation

#define TOP 0

Definition at line 31 of file vf_blend.c.

Referenced by config_output(), decode_pixel_in_context(), filter_frame(), mss4_decode_dct(), mss4_decode_dct_block(), mss4_update_dc_cache(), and request_frame().

#define BOTTOM 1

Definition at line 32 of file vf_blend.c.

Referenced by config_output(), filter_frame(), and request_frame().

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

Definition at line 91 of file vf_blend.c.

#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

Definition at line 92 of file vf_blend.c.

#define DEFINE_BLEND	(	name,
		expr
	)

Value:

static void blend_## name(const uint8_t *top, int top_linesize,       \
                          const uint8_t *bottom, int bottom_linesize, \
                          uint8_t *dst, int dst_linesize,             \
                          int width, int height, FilterParams *param) \
{                                                                     \
    double opacity = param->opacity;                                  \
    int i, j;                                                         \
                                                                      \
    for (i = 0; i < height; i++) {                                    \
        for (j = 0; j < width; j++) {                                 \
            dst[j] = top[j] + ((expr) - top[j]) * opacity;            \
        }                                                             \
        dst    += dst_linesize;                                       \
        top    += top_linesize;                                       \
        bottom += bottom_linesize;                                    \
    }                                                                 \
}

Definition at line 147 of file vf_blend.c.

#define A top[j]

Definition at line 166 of file vf_blend.c.

#define B bottom[j]

Definition at line 167 of file vf_blend.c.

#define MULTIPLY	(	x,
		a,
		b
	)	(x * ((a * b) / 255))

Definition at line 169 of file vf_blend.c.

#define SCREEN	(	x,
		a,
		b
	)	(255 - x * ((255 - a) * (255 - b) / 255))

Definition at line 170 of file vf_blend.c.

#define BURN	(	a,
		b
	)	((a == 0) ? a : FFMAX(0, 255 - ((255 - b) << 8) / a))

Definition at line 171 of file vf_blend.c.

#define DODGE	(	a,
		b
	)	((a == 255) ? a : FFMIN(255, ((b << 8) / (255 - a))))

Definition at line 172 of file vf_blend.c.

Enumeration Type Documentation

enum BlendMode

Enumerator:

BLEND_UNSET
BLEND_NORMAL
BLEND_ADDITION
BLEND_AND
BLEND_AVERAGE
BLEND_BURN
BLEND_DARKEN
BLEND_DIFFERENCE
BLEND_DIVIDE
BLEND_DODGE
BLEND_EXCLUSION
BLEND_HARDLIGHT
BLEND_LIGHTEN
BLEND_MULTIPLY
BLEND_NEGATION
BLEND_OR
BLEND_OVERLAY
BLEND_PHOENIX
BLEND_PINLIGHT
BLEND_REFLECT
BLEND_SCREEN
BLEND_SOFTLIGHT
BLEND_SUBTRACT
BLEND_VIVIDLIGHT
BLEND_XOR
BLEND_NB

Definition at line 34 of file vf_blend.c.

anonymous enum

Enumerator:

VAR_X
VAR_Y
VAR_W
VAR_H
VAR_SW
VAR_SH
VAR_T
VAR_A
VAR_B
VAR_TOP
VAR_BOTTOM
VAR_VARS_NB

Definition at line 64 of file vf_blend.c.

Function Documentation

AVFILTER_DEFINE_CLASS ( blend )

static void blend_normal	(	const uint8_t *	top,
		int	top_linesize,
		const uint8_t *	bottom,
		int	bottom_linesize,
		uint8_t *	dst,
		int	dst_linesize,
		int	width,
		int	height,
		FilterParams *	param
	)

static

Definition at line 139 of file vf_blend.c.

Referenced by init().

DEFINE_BLEND	(	overlay	,
		(A< 128)?MULTIPLY(2, A, B):SCREEN(2, A, B)
	)

Definition at line 181 of file vf_blend.c.

static av_cold int init	(	AVFilterContext *	ctx,
		const char *	args
	)

static

Definition at line 222 of file vf_blend.c.

static int query_formats ( AVFilterContext * ctx )

static

Definition at line 285 of file vf_blend.c.

static int config_output ( AVFilterLink * outlink )

static

Definition at line 297 of file vf_blend.c.

static int config_input_top ( AVFilterLink * inlink )

static

Definition at line 331 of file vf_blend.c.

static av_cold void uninit ( AVFilterContext * ctx )

static

Definition at line 341 of file vf_blend.c.

static int request_frame ( AVFilterLink * outlink )

static

Definition at line 354 of file vf_blend.c.

static void blend_frame	(	AVFilterContext *	ctx,
		AVFilterBufferRef *	top_buf,
		AVFilterBufferRef *	bottom_buf,
		AVFilterBufferRef *	dst_buf
	)

static

Definition at line 370 of file vf_blend.c.

Referenced by filter_frame().

static int filter_frame	(	AVFilterLink *	inlink,
		AVFilterBufferRef *	buf
	)

static

Definition at line 401 of file vf_blend.c.

Variable Documentation

const char* const var_names[] = { "X", "Y", "W", "H", "SW", "SH", "T", "A", "B", "TOP", "BOTTOM", NULL }

static

Definition at line 63 of file vf_blend.c.

Referenced by init().

const AVOption blend_options[]

static

Definition at line 94 of file vf_blend.c.

const AVFilterPad blend_inputs[]

static

Initial value:

= {
    {
        .name             = "top",
        .type             = AVMEDIA_TYPE_VIDEO,
        .config_props     = config_input_top,
        .filter_frame     = filter_frame,
        .min_perms        = AV_PERM_READ | AV_PERM_PRESERVE,
    },{
        .name             = "bottom",
        .type             = AVMEDIA_TYPE_VIDEO,
        .filter_frame     = filter_frame,
        .min_perms        = AV_PERM_READ | AV_PERM_PRESERVE,
    },
    { NULL }
}

Definition at line 438 of file vf_blend.c.

const AVFilterPad blend_outputs[]

static

Initial value:

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

Definition at line 454 of file vf_blend.c.

AVFilter avfilter_vf_blend

Initial value:

= {
    .name          = "blend",
    .description   = NULL_IF_CONFIG_SMALL("Blend two video frames into each other."),
    .init          = init,
    .uninit        = uninit,
    .priv_size     = sizeof(BlendContext),
    .query_formats = query_formats,
    .inputs        = blend_inputs,
    .outputs       = blend_outputs,
    .priv_class    = &blend_class,
}

Definition at line 464 of file vf_blend.c.

Data Structures

Macros

Enumerations

Functions

Variables

Macro Definition Documentation

Enumeration Type Documentation

Function Documentation

Variable Documentation