vf_vignette.c File Reference

#include <float.h>
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/eval.h"
#include "libavutil/pixdesc.h"
#include "avfilter.h"
#include "filters.h"
#include "video.h"

Go to the source code of this file.

Data Structures
struct	VignetteContext

Macros
#define	DEF_EXPR_FIELDS(name)
#define	OFFSET(x)
#define	FLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
#define	PARSE_EXPR(name)

Enumerations
enum	var_name {   VAR_W , VAR_H , VAR_N , VAR_PTS ,   VAR_R , VAR_T , VAR_TB , VAR_NB }
enum	EvalMode { EVAL_MODE_INIT , EVAL_MODE_FRAME , EVAL_MODE_NB }

Functions
	AVFILTER_DEFINE_CLASS (vignette)
static av_cold int	init (AVFilterContext *ctx)
static av_cold void	uninit (AVFilterContext *ctx)
static double	get_natural_factor (const VignetteContext *s, int x, int y)
static void	update_context (VignetteContext *s, AVFilterLink *inlink, AVFrame *frame)
static double	get_dither_value (VignetteContext *s)
static int	filter_frame (AVFilterLink *inlink, AVFrame *in)
static int	config_props (AVFilterLink *inlink)

Variables
static const char *const	var_names []
static const AVOption	vignette_options []
static enum AVPixelFormat	pix_fmts []
static const AVFilterPad	vignette_inputs []
const FFFilter	ff_vf_vignette

Macro Definition Documentation

DEF_EXPR_FIELDS

#define DEF_EXPR_FIELDS

(

name

)

Value:

AVExpr *name##_pexpr; char *name##_expr; double name

Definition at line 64 of file vf_vignette.c.

OFFSET

#define OFFSET

(

x

)

Value:

offsetof(VignetteContext, x)

Definition at line 79 of file vf_vignette.c.

FLAGS

#define FLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

Definition at line 80 of file vf_vignette.c.

PARSE_EXPR

#define PARSE_EXPR

(

name

)

Value:

    do {                                               \
    int ret = av_expr_parse(&s->name##_pexpr,  s->name##_expr, var_names,   \
                            NULL, NULL, NULL, NULL, 0, ctx);                \
    if (ret < 0) {                                                          \
        av_log(ctx, AV_LOG_ERROR, "Unable to parse expression for '"        \
               AV_STRINGIFY(name) "'\n");                                   \
        return ret;                                                         \
    }                                                                       \
} while (0)

Referenced by init().

Enumeration Type Documentation

var_name

enum var_name

Enumerator
VAR_W
VAR_H
VAR_N
VAR_PTS
VAR_R
VAR_T
VAR_TB
VAR_NB

Definition at line 42 of file vf_vignette.c.

EvalMode

enum EvalMode

Enumerator
EVAL_MODE_INIT
EVAL_MODE_FRAME
EVAL_MODE_NB

Definition at line 53 of file vf_vignette.c.

Function Documentation

AVFILTER_DEFINE_CLASS()

AVFILTER_DEFINE_CLASS

(

vignette

)

init()

static av_cold int init ( AVFilterContext * ctx )

static

Definition at line 99 of file vf_vignette.c.

uninit()

static av_cold void uninit ( AVFilterContext * ctx )

static

Definition at line 119 of file vf_vignette.c.

get_natural_factor()

static double get_natural_factor ( const VignetteContext * s, int x, int y )

static

Definition at line 137 of file vf_vignette.c.

Referenced by update_context().

update_context()

static void update_context ( VignetteContext * s, AVFilterLink * inlink, AVFrame * frame )

static

Definition at line 150 of file vf_vignette.c.

Referenced by config_props(), filter_frame(), and update_moov_atom().

get_dither_value()

static double get_dither_value ( VignetteContext * s )

inlinestatic

Definition at line 191 of file vf_vignette.c.

Referenced by filter_frame().

filter_frame()

static int filter_frame ( AVFilterLink * inlink, AVFrame * in )

static

Definition at line 201 of file vf_vignette.c.

config_props()

static int config_props ( AVFilterLink * inlink )

static

Definition at line 284 of file vf_vignette.c.

Variable Documentation

var_names

const char* const var_names[]

static

Initial value:

= {
    "w",    
    "h",    
    "n",    
    "pts",  
    "r",    
    "t",    
    "tb",   
    NULL
}

Definition at line 31 of file vf_vignette.c.

vignette_options

const AVOption vignette_options[]

static

Initial value:

= {
    { "angle", "set lens angle", OFFSET(angle_expr), AV_OPT_TYPE_STRING, {.str="PI/5"}, .flags = FLAGS },
    { "a",     "set lens angle", OFFSET(angle_expr), AV_OPT_TYPE_STRING, {.str="PI/5"}, .flags = FLAGS },
    { "x0", "set circle center position on x-axis", OFFSET(x0_expr), AV_OPT_TYPE_STRING, {.str="w/2"}, .flags = FLAGS },
    { "y0", "set circle center position on y-axis", OFFSET(y0_expr), AV_OPT_TYPE_STRING, {.str="h/2"}, .flags = FLAGS },
    { "mode", "set forward/backward mode", OFFSET(backward), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, FLAGS, .unit = "mode" },
        { "forward",  NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 0}, INT_MIN, INT_MAX, FLAGS, .unit = "mode"},
        { "backward", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 1}, INT_MIN, INT_MAX, FLAGS, .unit = "mode"},
    { "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_INIT}, 0, EVAL_MODE_NB-1, FLAGS, .unit = "eval" },
        { "init",  "eval expressions once during initialization", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_INIT},  .flags = FLAGS, .unit = "eval" },
        { "frame", "eval expressions for each frame",             0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = FLAGS, .unit = "eval" },
    { "dither", "set dithering", OFFSET(do_dither), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, FLAGS },
    { "aspect", "set aspect ratio", OFFSET(aspect), AV_OPT_TYPE_RATIONAL, {.dbl = 1}, 0, DBL_MAX, .flags = FLAGS },
    { NULL }
}

Definition at line 81 of file vf_vignette.c.

pix_fmts

enum AVPixelFormat 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_RGB24,   AV_PIX_FMT_BGR24,
    AV_PIX_FMT_GRAY8,
    AV_PIX_FMT_NONE
}

Definition at line 128 of file vf_vignette.c.

vignette_inputs

const AVFilterPad vignette_inputs[]

static

Initial value:

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

Definition at line 322 of file vf_vignette.c.

ff_vf_vignette

const FFFilter ff_vf_vignette

Initial value:

= {
    .p.name        = "vignette",
    .p.description = NULL_IF_CONFIG_SMALL("Make or reverse a vignette effect."),
    .p.priv_class  = &vignette_class,
    .p.flags       = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
    .priv_size     = sizeof(VignetteContext),
    .init          = init,
    .uninit        = uninit,
    FILTER_INPUTS(vignette_inputs),
    FILTER_OUTPUTS(ff_video_default_filterpad),
    FILTER_PIXFMTS_ARRAY(pix_fmts),
}

Definition at line 331 of file vf_vignette.c.