libavfilter/vf_fade.c File Reference

video fade filter based heavily on vf_negate.c by Bobby Bingham More...

#include "libavutil/avstring.h"
#include "libavutil/common.h"
#include "libavutil/eval.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "avfilter.h"
#include "drawutils.h"
#include "internal.h"
#include "formats.h"
#include "video.h"

Go to the source code of this file.

Data Structures
struct	FadeContext
Defines
#define	R   0
#define	G   1
#define	B   2
#define	A   3
#define	Y   0
#define	U   1
#define	V   2
#define	OFFSET(x)   offsetof(FadeContext, x)
#define	FLAGS   AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
Functions
	AVFILTER_DEFINE_CLASS (fade)
static av_cold int	init (AVFilterContext *ctx, const char *args)
static av_cold void	uninit (AVFilterContext *ctx)
static int	query_formats (AVFilterContext *ctx)
static int	config_props (AVFilterLink *inlink)
static void	fade_plane (int y, int h, int w, int fade_factor, int black_level, int black_level_scaled, uint8_t offset, uint8_t step, int bytes_per_plane, uint8_t *data, int line_size)
static int	draw_slice (AVFilterLink *inlink, int y, int h, int slice_dir)
static int	end_frame (AVFilterLink *inlink)
Variables
static const AVOption	fade_options []
static const enum PixelFormat	studio_level_pix_fmts []
static enum PixelFormat	alpha_pix_fmts []
AVFilter	avfilter_vf_fade

---

Detailed Description

video fade filter based heavily on vf_negate.c by Bobby Bingham

Definition in file vf_fade.c.

---

Define Documentation

#define A   3

Definition at line 43 of file vf_fade.c.

#define B   2

Definition at line 42 of file vf_fade.c.

#define FLAGS   AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 63 of file vf_fade.c.

#define G   1

Definition at line 41 of file vf_fade.c.

#define OFFSET

(

x

)

offsetof(FadeContext, x)

Definition at line 62 of file vf_fade.c.

#define R   0

Definition at line 40 of file vf_fade.c.

#define U   1

Definition at line 46 of file vf_fade.c.

#define V   2

Definition at line 47 of file vf_fade.c.

#define Y   0

Definition at line 45 of file vf_fade.c.

---

Function Documentation

AVFILTER_DEFINE_CLASS

(

fade

)

static int config_props

(

AVFilterLink *

inlink

)

[static]

Definition at line 179 of file vf_fade.c.

static int draw_slice	(	AVFilterLink *	inlink,
		int	y,
		int	h,
		int	slice_dir
	)			[static]

Definition at line 219 of file vf_fade.c.

static int end_frame

(

AVFilterLink *

inlink

)

[static]

Definition at line 263 of file vf_fade.c.

static void fade_plane	(	int	y,
		int	h,
		int	w,
		int	fade_factor,
		int	black_level,
		int	black_level_scaled,
		uint8_t	offset,
		uint8_t	step,
		int	bytes_per_plane,
		uint8_t *	data,
		int	line_size
	)			[static]

Definition at line 200 of file vf_fade.c.

Referenced by draw_slice().

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

Definition at line 78 of file vf_fade.c.

static int query_formats

(

AVFilterContext *

ctx

)

[static]

Definition at line 147 of file vf_fade.c.

static av_cold void uninit

(

AVFilterContext *

ctx

)

[static]

Definition at line 140 of file vf_fade.c.

---

Variable Documentation

enum PixelFormat alpha_pix_fmts[] [static]

Initial value:

 {
    PIX_FMT_YUVA420P,
    PIX_FMT_ARGB, PIX_FMT_ABGR,
    PIX_FMT_RGBA, PIX_FMT_BGRA,
    PIX_FMT_NONE
}

Definition at line 172 of file vf_fade.c.

Referenced by config_input_main(), config_input_overlay(), and config_props().

AVFilter avfilter_vf_fade

Initial value:

 {
    .name          = "fade",
    .description   = NULL_IF_CONFIG_SMALL("Fade in/out input video."),
    .init          = init,
    .uninit        = uninit,
    .priv_size     = sizeof(FadeContext),
    .query_formats = query_formats,

    .inputs    = (const AVFilterPad[]) {{ .name            = "default",
                                          .type            = AVMEDIA_TYPE_VIDEO,
                                          .config_props    = config_props,
                                          .get_video_buffer = ff_null_get_video_buffer,
                                          .start_frame      = ff_null_start_frame,
                                          .draw_slice      = draw_slice,
                                          .end_frame       = end_frame,
                                          .min_perms       = AV_PERM_READ | AV_PERM_WRITE },
                                        { .name = NULL}},
    .outputs   = (const AVFilterPad[]) {{ .name            = "default",
                                          .type            = AVMEDIA_TYPE_VIDEO, },
                                        { .name = NULL}},
    .priv_class = &fade_class,
}

Definition at line 279 of file vf_fade.c.

const AVOption fade_options[] [static]

Initial value:

 {
    { "type",        "set the fade direction",                     OFFSET(type),        AV_OPT_TYPE_STRING, {.str = "in" }, CHAR_MIN, CHAR_MAX, FLAGS },
    { "t",           "set the fade direction",                     OFFSET(type),        AV_OPT_TYPE_STRING, {.str = "in" }, CHAR_MIN, CHAR_MAX, FLAGS },
    { "start_frame", "set expression of frame to start fading",    OFFSET(start_frame), AV_OPT_TYPE_INT, {.i64 = 0    }, 0, INT_MAX, FLAGS },
    { "s",           "set expression of frame to start fading",    OFFSET(start_frame), AV_OPT_TYPE_INT, {.i64 = 0    }, 0, INT_MAX, FLAGS },
    { "nb_frames",   "set expression for fade duration in frames", OFFSET(nb_frames),   AV_OPT_TYPE_INT, {.i64 = 25   }, 0, INT_MAX, FLAGS },
    { "n",           "set expression for fade duration in frames", OFFSET(nb_frames),   AV_OPT_TYPE_INT, {.i64 = 25   }, 0, INT_MAX, FLAGS },
    { "alpha",       "fade alpha if it is available on the input", OFFSET(alpha),       AV_OPT_TYPE_INT, {.i64 = 0    }, 0,       1, FLAGS },
    {NULL},
}

Definition at line 65 of file vf_fade.c.

const enum PixelFormat studio_level_pix_fmts[] [static]

Initial value:

 {
    PIX_FMT_YUV444P,  PIX_FMT_YUV422P,  PIX_FMT_YUV420P,
    PIX_FMT_YUV411P,  PIX_FMT_YUV410P,
    PIX_FMT_YUV440P,
    PIX_FMT_NONE
}

Definition at line 165 of file vf_fade.c.

Referenced by config_props().