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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.

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",
.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",
},
{ 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,
.priv_class = &perspective_class,
}

Definition at line 392 of file vf_perspective.c.