Spherical video mapping

Граф связей класса Spherical video mapping:

Классы
struct	AVSphericalMapping

Определения типов
typedef struct AVSphericalMapping	AVSphericalMapping

Перечисления
enum	AVSphericalProjection { AV_SPHERICAL_EQUIRECTANGULAR, AV_SPHERICAL_CUBEMAP, AV_SPHERICAL_EQUIRECTANGULAR_TILE }

Функции
AVSphericalMapping *	av_spherical_alloc (size_t *size)
void	av_spherical_tile_bounds (const AVSphericalMapping *map, size_t width, size_t height, size_t *left, size_t *top, size_t *right, size_t *bottom)
const char *	av_spherical_projection_name (enum AVSphericalProjection projection)
int	av_spherical_from_name (const char *name)

Подробное описание

A spherical video file contains surfaces that need to be mapped onto a sphere. Depending on how the frame was converted, a different distortion transformation or surface recomposition function needs to be applied before the video should be mapped and displayed.

Типы

AVSphericalMapping

typedef struct AVSphericalMapping AVSphericalMapping

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavutil/spherical.h>

This structure describes how to handle spherical videos, outlining information about projection, initial layout, and any other view modifier.

Заметки

The struct must be allocated with av_spherical_alloc() and its size is not a part of the public ABI.

Перечисления

AVSphericalProjection

enum AVSphericalProjection

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavutil/spherical.h>

Projection of the video surface(s) on a sphere.

Элементы перечислений
AV_SPHERICAL_EQUIRECTANGULAR	Video represents a sphere mapped on a flat surface using equirectangular projection.
AV_SPHERICAL_CUBEMAP	Video frame is split into 6 faces of a cube, and arranged on a 3x2 layout. Faces are oriented upwards for the front, left, right, and back faces. The up face is oriented so the top of the face is forwards and the down face is oriented so the top of the face is to the back.
AV_SPHERICAL_EQUIRECTANGULAR_TILE	Video represents a portion of a sphere mapped on a flat surface using equirectangular projection. The bounding fields indicate the position of the current video in a larger surface.

См. определение в файле spherical.h строка 51

                           {
    AV_SPHERICAL_EQUIRECTANGULAR,
 
    AV_SPHERICAL_CUBEMAP,
 
    AV_SPHERICAL_EQUIRECTANGULAR_TILE,
};

Функции

av_spherical_alloc()

AVSphericalMapping* av_spherical_alloc

(

size_t *

size

)

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavutil/spherical.h>

Allocate a AVSphericalVideo structure and initialize its fields to default values.

Возвращает

the newly allocated struct or NULL on failure

av_spherical_tile_bounds()

void av_spherical_tile_bounds	(	const AVSphericalMapping *	map,
		size_t	width,
		size_t	height,
		size_t *	left,
		size_t *	top,
		size_t *	right,
		size_t *	bottom
	)

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavutil/spherical.h>

Convert the bounding fields from an AVSphericalVideo from 0.32 fixed point to pixels.

Аргументы

map	The AVSphericalVideo map to read bound values from.
width	Width of the current frame or stream.
height	Height of the current frame or stream.
left	Pixels from the left edge.
top	Pixels from the top edge.
right	Pixels from the right edge.
bottom	Pixels from the bottom edge.

av_spherical_projection_name()

const char* av_spherical_projection_name

(

enum AVSphericalProjection

projection

)

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavutil/spherical.h>

Provide a human-readable name of a given AVSphericalProjection.

Аргументы

projection

The input AVSphericalProjection.

Возвращает

The name of the AVSphericalProjection, or "unknown".

av_spherical_from_name()

int av_spherical_from_name

(

const char *

name

)

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavutil/spherical.h>

Get the AVSphericalProjection form a human-readable name.

Аргументы

name	The input string.

Возвращает

The AVSphericalProjection value, or -1 if not found.