#include "libavutil/avassert.h"
#include "libavutil/eval.h"
#include "libavutil/imgutils.h"
#include "libavutil/mem.h"
#include "libavutil/pixdesc.h"
#include "libavutil/opt.h"
#include "avfilter.h"
#include "filters.h"
#include "video.h"

Data Structures
struct	PerspectiveContext

struct	ThreadData
	Used for passing data between threads. More...

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	PERSPECTIVESense { PERSPECTIVE_SENSE_SOURCE = 0, PERSPECTIVE_SENSE_DESTINATION = 1 }

enum	EvalMode { EVAL_MODE_ONCE, EVAL_MODE_FRAME, EVAL_MODE_NB, EVAL_MODE_INIT, EVAL_MODE_FRAME, EVAL_MODE_NB, EVAL_MODE_INIT, EVAL_MODE_FRAME, EVAL_MODE_NB, EVAL_MODE_INIT, EVAL_MODE_FRAME, EVAL_MODE_NB, EVAL_MODE_INIT, EVAL_MODE_FRAME, EVAL_MODE_NB, EVAL_MODE_INIT, EVAL_MODE_FRAME, EVAL_MODE_NB, EVAL_MODE_INIT, EVAL_MODE_FRAME, EVAL_MODE_NB, EVAL_MODE_INIT, EVAL_MODE_FRAME, EVAL_MODE_NB, EVAL_MODE_INIT, EVAL_MODE_FRAME, EVAL_MODE_NB }

enum	{ VAR_W, VAR_H, VAR_IN, VAR_ON, VAR_VARS_NB }

Functions
	AVFILTER_DEFINE_CLASS (perspective)

static double	get_coeff (double d)

static int	calc_persp_luts (AVFilterContext ctx, AVFilterLink inlink)

static int	config_input (AVFilterLink *inlink)

static int	resample_cubic (AVFilterContext ctx, void arg, int job, int nb_jobs)

static int	resample_linear (AVFilterContext ctx, void arg, int job, int nb_jobs)

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 enum AVPixelFormat	pix_fmts []

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

static const AVFilterPad	perspective_inputs []

const AVFilter	ff_vf_perspective

Macro Definition Documentation

◆ SUB_PIXEL_BITS

#define SUB_PIXEL_BITS 8

Definition at line 32 of file vf_perspective.c.

◆ SUB_PIXELS

#define SUB_PIXELS (1 << SUB_PIXEL_BITS)

Definition at line 33 of file vf_perspective.c.

◆ COEFF_BITS

#define COEFF_BITS 11

Definition at line 34 of file vf_perspective.c.

◆ LINEAR

#define LINEAR 0

Definition at line 36 of file vf_perspective.c.

◆ CUBIC

#define CUBIC 1

Definition at line 37 of file vf_perspective.c.

◆ OFFSET

#define OFFSET ( x ) offsetof(PerspectiveContext, x)

Definition at line 57 of file vf_perspective.c.

◆ FLAGS

#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

Definition at line 58 of file vf_perspective.c.

Enumeration Type Documentation

◆ PERSPECTIVESense

enum PERSPECTIVESense

Enumerator
PERSPECTIVE_SENSE_SOURCE	coordinates give locations in source of corners of destination.
PERSPECTIVE_SENSE_DESTINATION	coordinates give locations in destination of corners of source.

Definition at line 60 of file vf_perspective.c.

◆ EvalMode

enum EvalMode

Enumerator
EVAL_MODE_ONCE
EVAL_MODE_FRAME
EVAL_MODE_NB
EVAL_MODE_INIT
EVAL_MODE_FRAME
EVAL_MODE_NB
EVAL_MODE_INIT
EVAL_MODE_FRAME
EVAL_MODE_NB
EVAL_MODE_INIT
EVAL_MODE_FRAME
EVAL_MODE_NB
EVAL_MODE_INIT
EVAL_MODE_FRAME
EVAL_MODE_NB
EVAL_MODE_INIT
EVAL_MODE_FRAME
EVAL_MODE_NB
EVAL_MODE_INIT
EVAL_MODE_FRAME
EVAL_MODE_NB
EVAL_MODE_INIT
EVAL_MODE_FRAME
EVAL_MODE_NB
EVAL_MODE_INIT
EVAL_MODE_FRAME
EVAL_MODE_NB

Definition at line 65 of file vf_perspective.c.

◆ anonymous enum

anonymous enum

Enumerator
VAR_W
VAR_H
VAR_IN
VAR_ON
VAR_VARS_NB

Definition at line 121 of file vf_perspective.c.

Function Documentation

◆ AVFILTER_DEFINE_CLASS()

AVFILTER_DEFINE_CLASS ( perspective )

◆ get_coeff()

static double get_coeff ( double d )

inlinestatic

Definition at line 104 of file vf_perspective.c.

Referenced by config_input().

◆ calc_persp_luts()

static int calc_persp_luts	(	AVFilterContext *	ctx,
		AVFilterLink *	inlink
	)

static

Definition at line 123 of file vf_perspective.c.

Referenced by config_input(), and filter_frame().

◆ config_input()

static int config_input ( AVFilterLink * inlink )

static

Definition at line 222 of file vf_perspective.c.

◆ resample_cubic()

static int resample_cubic	(	AVFilterContext *	ctx,
		void *	arg,
		int	job,
		int	nb_jobs
	)

static

Definition at line 276 of file vf_perspective.c.

Referenced by init().

◆ resample_linear()

static int resample_linear	(	AVFilterContext *	ctx,
		void *	arg,
		int	job,
		int	nb_jobs
	)

static

Definition at line 355 of file vf_perspective.c.

Referenced by init().

◆ init()

static av_cold int init ( AVFilterContext * ctx )

static

Definition at line 430 of file vf_perspective.c.

◆ filter_frame()

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

static

Definition at line 442 of file vf_perspective.c.

◆ uninit()

static av_cold void uninit ( AVFilterContext * ctx )

static

Definition at line 484 of file vf_perspective.c.

Variable Documentation

◆ perspective_options

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, .unit = "interpolation" },
    {      "linear", "", 0, AV_OPT_TYPE_CONST, {.i64=LINEAR}, 0, 0, FLAGS, .unit = "interpolation" },
    {       "cubic", "", 0, AV_OPT_TYPE_CONST, {.i64=CUBIC},  0, 0, FLAGS, .unit = "interpolation" },
    { "sense",   "specify the sense of the coordinates", OFFSET(sense), AV_OPT_TYPE_INT, {.i64=PERSPECTIVE_SENSE_SOURCE}, 0, 1, FLAGS, .unit = "sense"},
    {       "source", "specify locations in source to send to corners in destination",
                0, AV_OPT_TYPE_CONST, {.i64=PERSPECTIVE_SENSE_SOURCE}, 0, 0, FLAGS, .unit = "sense"},
    {       "destination", "specify locations in destination to send corners of source",
                0, AV_OPT_TYPE_CONST, {.i64=PERSPECTIVE_SENSE_DESTINATION}, 0, 0, FLAGS, .unit = "sense"},
    { "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 per-frame",                  0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = FLAGS, .unit = "eval" },
 
    { NULL }
}

Definition at line 71 of file vf_perspective.c.

◆ pix_fmts

enum AVPixelFormat pix_fmts[]

static

Initial value:

= {
    AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P,
    AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ422P,AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ411P,
    AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
    AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP, AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE
}

Definition at line 97 of file vf_perspective.c.

◆ var_names

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

static

Definition at line 120 of file vf_perspective.c.

Referenced by calc_persp_luts().

◆ perspective_inputs

const AVFilterPad perspective_inputs[]

static

Initial value:

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

Definition at line 491 of file vf_perspective.c.

◆ ff_vf_perspective

const AVFilter ff_vf_perspective

Initial value:

= {
    .name          = "perspective",
    .description   = NULL_IF_CONFIG_SMALL("Correct the perspective of video."),
    .priv_size     = sizeof(PerspectiveContext),
    .init          = init,
    .uninit        = uninit,
    FILTER_INPUTS(perspective_inputs),
    FILTER_OUTPUTS(ff_video_default_filterpad),
    FILTER_PIXFMTS_ARRAY(pix_fmts),
    .priv_class    = &perspective_class,
    .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
}

Definition at line 500 of file vf_perspective.c.

Data Structures

Macros

Enumerations

Functions

Variables

Macro Definition Documentation

◆ SUB_PIXEL_BITS

◆ SUB_PIXELS

◆ COEFF_BITS

◆ LINEAR

◆ CUBIC

◆ OFFSET

◆ FLAGS

Enumeration Type Documentation

◆ PERSPECTIVESense

◆ EvalMode

◆ anonymous enum

Function Documentation

◆ AVFILTER_DEFINE_CLASS()

◆ get_coeff()

◆ calc_persp_luts()

◆ config_input()

◆ resample_cubic()

◆ resample_linear()

◆ init()

◆ filter_frame()

◆ uninit()

Variable Documentation

◆ perspective_options

◆ pix_fmts

◆ var_names

◆ perspective_inputs

◆ ff_vf_perspective