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

Macros
#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	filter_frame (AVFilterLink *inlink, AVFilterBufferRef *frame)

Variables
static const AVOption	fade_options []
static const enum AVPixelFormat	studio_level_pix_fmts []
static const AVFilterPad	avfilter_vf_fade_inputs []
static const AVFilterPad	avfilter_vf_fade_outputs []
AVFilter	avfilter_vf_fade

Detailed Description

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

Definition in file vf_fade.c.

Macro Definition Documentation

#define R   0

Definition at line 40 of file vf_fade.c.

#define G   1

Definition at line 41 of file vf_fade.c.

#define B   2

Definition at line 42 of file vf_fade.c.

#define A   3

Definition at line 43 of file vf_fade.c.

#define Y   0

Definition at line 45 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 OFFSET

(

x

)

offsetof(FadeContext, x)

Definition at line 62 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.

Function Documentation

AVFILTER_DEFINE_CLASS

(

fade

)

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

static

Definition at line 78 of file vf_fade.c.

static av_cold void uninit ( AVFilterContext *  ctx )

static

Definition at line 109 of file vf_fade.c.

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 116 of file vf_fade.c.

static int config_props ( AVFilterLink *  inlink )

static

Definition at line 141 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 162 of file vf_fade.c.

Referenced by filter_frame().

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

static

Definition at line 181 of file vf_fade.c.

Variable Documentation

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 AVPixelFormat studio_level_pix_fmts[]

static

Initial value:

= {
    AV_PIX_FMT_YUV444P,  AV_PIX_FMT_YUV422P,  AV_PIX_FMT_YUV420P,
    AV_PIX_FMT_YUV411P,  AV_PIX_FMT_YUV410P,
    AV_PIX_FMT_YUV440P,
    AV_PIX_FMT_NONE
}

Definition at line 134 of file vf_fade.c.

Referenced by config_props().

const AVFilterPad avfilter_vf_fade_inputs[]

static

Initial value:

= {
    {
        .name             = "default",
        .type             = AVMEDIA_TYPE_VIDEO,
        .config_props     = config_props,
        .get_video_buffer = ff_null_get_video_buffer,
        .filter_frame     = filter_frame,
        .min_perms        = AV_PERM_READ | AV_PERM_WRITE,
    },
    { NULL }
}

Definition at line 230 of file vf_fade.c.

const AVFilterPad avfilter_vf_fade_outputs[]

static

Initial value:

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

Definition at line 242 of file vf_fade.c.

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    = avfilter_vf_fade_inputs,
    .outputs   = avfilter_vf_fade_outputs,
    .priv_class = &fade_class,
}

Definition at line 250 of file vf_fade.c.