vf_perspective.c File Reference

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

Go to the source code of this file.

Data Structures
struct	PerspectiveContext

Macros
#define	SUB_PIXEL_BITS   8
#define	SUB_PIXELS   (1 << SUB_PIXEL_BITS)
#define	COEFF_BITS   11
#define	LINEAR   0
#define	CUBIC   1
#define	OFFSET(x)   offsetof(PerspectiveContext, x)
#define	FLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

Enumerations
enum	{ VAR_W, VAR_H, VAR_VARS_NB }

Functions
	AVFILTER_DEFINE_CLASS (perspective)
static int	query_formats (AVFilterContext *ctx)
static double	get_coeff (double d)
static int	config_input (AVFilterLink *inlink)
static void	resample_cubic (PerspectiveContext *s, uint8_t *dst, int dst_linesize, uint8_t *src, int src_linesize, int w, int h, int hsub, int vsub)
static void	resample_linear (PerspectiveContext *s, uint8_t *dst, int dst_linesize, uint8_t *src, int src_linesize, int w, int h, int hsub, int vsub)
static av_cold int	init (AVFilterContext *ctx)
static int	filter_frame (AVFilterLink *inlink, AVFrame *frame)
static av_cold void	uninit (AVFilterContext *ctx)

Variables
static const AVOption	perspective_options []
static const char *const	var_names [] = { "W", "H", NULL }
static const AVFilterPad	perspective_inputs []
static const AVFilterPad	perspective_outputs []
AVFilter	avfilter_vf_perspective

Macro Definition Documentation

#define SUB_PIXEL_BITS   8

Definition at line 31 of file vf_perspective.c.

Referenced by resample_cubic(), and resample_linear().

#define SUB_PIXELS   (1 << SUB_PIXEL_BITS)

Definition at line 32 of file vf_perspective.c.

Referenced by config_input(), resample_cubic(), and resample_linear().

#define COEFF_BITS   11

Definition at line 33 of file vf_perspective.c.

Referenced by config_input(), and resample_cubic().

#define LINEAR   0

Definition at line 35 of file vf_perspective.c.

Referenced by init().

#define CUBIC   1

Definition at line 36 of file vf_perspective.c.

Referenced by init().

#define OFFSET

(

x

)

offsetof(PerspectiveContext, x)

Definition at line 56 of file vf_perspective.c.

#define FLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

Definition at line 57 of file vf_perspective.c.

Enumeration Type Documentation

anonymous enum

Enumerator:

VAR_W
VAR_H
VAR_VARS_NB

Definition at line 106 of file vf_perspective.c.

Function Documentation

AVFILTER_DEFINE_CLASS

(

perspective

)

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 76 of file vf_perspective.c.

static double get_coeff ( double  d )

inlinestatic

Definition at line 89 of file vf_perspective.c.

Referenced by config_input().

static int config_input ( AVFilterLink *  inlink )

static

Definition at line 108 of file vf_perspective.c.

static void resample_cubic ( PerspectiveContext *  s, uint8_t *  dst, int  dst_linesize, uint8_t *  src, int  src_linesize, int  w, int  h, int  hsub, int  vsub  )

static

Definition at line 196 of file vf_perspective.c.

Referenced by init().

static void resample_linear ( PerspectiveContext *  s, uint8_t *  dst, int  dst_linesize, uint8_t *  src, int  src_linesize, int  w, int  h, int  hsub, int  vsub  )

static

Definition at line 264 of file vf_perspective.c.

Referenced by init().

static av_cold int init ( AVFilterContext *  ctx )

static

Definition at line 328 of file vf_perspective.c.

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

static

Definition at line 340 of file vf_perspective.c.

static av_cold void uninit ( AVFilterContext *  ctx )

static

Definition at line 367 of file vf_perspective.c.

Variable Documentation

const AVOption perspective_options[]

static

Initial value:

= {
    { "x0", "set top left x coordinate",     OFFSET(expr_str[0][0]), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, FLAGS },
    { "y0", "set top left y coordinate",     OFFSET(expr_str[0][1]), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, FLAGS },
    { "x1", "set top right x coordinate",    OFFSET(expr_str[1][0]), AV_OPT_TYPE_STRING, {.str="W"}, 0, 0, FLAGS },
    { "y1", "set top right y coordinate",    OFFSET(expr_str[1][1]), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, FLAGS },
    { "x2", "set bottom left x coordinate",  OFFSET(expr_str[2][0]), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, FLAGS },
    { "y2", "set bottom left y coordinate",  OFFSET(expr_str[2][1]), AV_OPT_TYPE_STRING, {.str="H"}, 0, 0, FLAGS },
    { "x3", "set bottom right x coordinate", OFFSET(expr_str[3][0]), AV_OPT_TYPE_STRING, {.str="W"}, 0, 0, FLAGS },
    { "y3", "set bottom right y coordinate", OFFSET(expr_str[3][1]), AV_OPT_TYPE_STRING, {.str="H"}, 0, 0, FLAGS },
    { "interpolation", "set interpolation", OFFSET(interpolation), AV_OPT_TYPE_INT, {.i64=LINEAR}, 0, 1, FLAGS, "interpolation" },
    {      "linear", "", 0, AV_OPT_TYPE_CONST, {.i64=LINEAR}, 0, 0, FLAGS, "interpolation" },
    {       "cubic", "", 0, AV_OPT_TYPE_CONST, {.i64=CUBIC},  0, 0, FLAGS, "interpolation" },
    { NULL }
}

Definition at line 59 of file vf_perspective.c.

const char* const var_names[] = { "W", "H", NULL }

static

Definition at line 105 of file vf_perspective.c.

Referenced by config_input().

const AVFilterPad perspective_inputs[]

static

Initial value:

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

Definition at line 374 of file vf_perspective.c.

const AVFilterPad perspective_outputs[]

static

Initial value:

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

Definition at line 384 of file vf_perspective.c.

AVFilter avfilter_vf_perspective

Initial value:

= {
    .name          = "perspective",
    .description   = NULL_IF_CONFIG_SMALL("Correct the perspective of video."),
    .priv_size     = sizeof(PerspectiveContext),
    .init          = init,
    .uninit        = uninit,
    .query_formats = query_formats,
    .inputs        = perspective_inputs,
    .outputs       = perspective_outputs,
    .priv_class    = &perspective_class,
    .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
}

Definition at line 392 of file vf_perspective.c.