vf_v360.c File Reference

#include <math.h>
#include "libavutil/avassert.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"
#include "v360.h"

Go to the source code of this file.

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

Macros
#define	OFFSET(x)   offsetof(V360Context, x)
#define	FLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
#define	TFLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
#define	DEFINE_REMAP1_LINE(bits, div)
#define	DEFINE_REMAP(ws, bits)
	Generate remapping function with a given window size and pixel depth. More...
#define	DEFINE_REMAP_LINE(ws, bits, div)

Functions
	AVFILTER_DEFINE_CLASS (v360)
static int	query_formats (AVFilterContext *ctx)
void	ff_v360_init (V360Context *s, int depth)
static void	nearest_kernel (float du, float dv, const XYRemap *rmap, int16_t *u, int16_t *v, int16_t *ker)
	Save nearest pixel coordinates for remapping. More...
static void	bilinear_kernel (float du, float dv, const XYRemap *rmap, int16_t *u, int16_t *v, int16_t *ker)
	Calculate kernel for bilinear interpolation. More...
static void	calculate_lagrange_coeffs (float t, float *coeffs)
	Calculate 1-dimensional lagrange coefficients. More...
static void	lagrange_kernel (float du, float dv, const XYRemap *rmap, int16_t *u, int16_t *v, int16_t *ker)
	Calculate kernel for lagrange interpolation. More...
static void	calculate_bicubic_coeffs (float t, float *coeffs)
	Calculate 1-dimensional cubic coefficients. More...
static void	bicubic_kernel (float du, float dv, const XYRemap *rmap, int16_t *u, int16_t *v, int16_t *ker)
	Calculate kernel for bicubic interpolation. More...
static void	calculate_lanczos_coeffs (float t, float *coeffs)
	Calculate 1-dimensional lanczos coefficients. More...
static void	lanczos_kernel (float du, float dv, const XYRemap *rmap, int16_t *u, int16_t *v, int16_t *ker)
	Calculate kernel for lanczos interpolation. More...
static void	calculate_spline16_coeffs (float t, float *coeffs)
	Calculate 1-dimensional spline16 coefficients. More...
static void	spline16_kernel (float du, float dv, const XYRemap *rmap, int16_t *u, int16_t *v, int16_t *ker)
	Calculate kernel for spline16 interpolation. More...
static void	calculate_gaussian_coeffs (float t, float *coeffs)
	Calculate 1-dimensional gaussian coefficients. More...
static void	gaussian_kernel (float du, float dv, const XYRemap *rmap, int16_t *u, int16_t *v, int16_t *ker)
	Calculate kernel for gaussian interpolation. More...
static void	calculate_cubic_bc_coeffs (float t, float *coeffs, float b, float c)
	Calculate 1-dimensional cubic_bc_spline coefficients. More...
static void	mitchell_kernel (float du, float dv, const XYRemap *rmap, int16_t *u, int16_t *v, int16_t *ker)
	Calculate kernel for mitchell interpolation. More...
static int	mod (int a, int b)
	Modulo operation with only positive remainders. More...
static int	reflecty (int y, int h)
	Reflect y operation. More...
static int	ereflectx (int x, int y, int w, int h)
	Reflect x operation for equirect. More...
static int	reflectx (int x, int y, int w, int h)
	Reflect x operation. More...
static int	get_direction (char c)
	Convert char to corresponding direction. More...
static int	get_rotation (char c)
	Convert char to corresponding rotation angle. More...
static int	get_rorder (char c)
	Convert char to corresponding rotation order. More...
static int	prepare_cube_in (AVFilterContext *ctx)
	Prepare data for processing cubemap input format. More...
static int	prepare_cube_out (AVFilterContext *ctx)
	Prepare data for processing cubemap output format. More...
static void	rotate_cube_face (float *uf, float *vf, int rotation)
static void	rotate_cube_face_inverse (float *uf, float *vf, int rotation)
static void	normalize_vector (float *vec)
	Normalize vector. More...
static void	cube_to_xyz (const V360Context *s, float uf, float vf, int face, float *vec, float scalew, float scaleh)
	Calculate 3D coordinates on sphere for corresponding cubemap position. More...
static void	xyz_to_cube (const V360Context *s, const float *vec, float *uf, float *vf, int *direction)
	Calculate cubemap position for corresponding 3D coordinates on sphere. More...
static void	process_cube_coordinates (const V360Context *s, float uf, float vf, int direction, float *new_uf, float *new_vf, int *face)
	Find position on another cube face in case of overflow/underflow. More...
static int	cube3x2_to_xyz (const V360Context *s, int i, int j, int width, int height, float *vec)
	Calculate 3D coordinates on sphere for corresponding frame position in cubemap3x2 format. More...
static int	xyz_to_cube3x2 (const V360Context *s, const float *vec, int width, int height, int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
	Calculate frame position in cubemap3x2 format for corresponding 3D coordinates on sphere. More...
static int	cube1x6_to_xyz (const V360Context *s, int i, int j, int width, int height, float *vec)
	Calculate 3D coordinates on sphere for corresponding frame position in cubemap1x6 format. More...
static int	cube6x1_to_xyz (const V360Context *s, int i, int j, int width, int height, float *vec)
	Calculate 3D coordinates on sphere for corresponding frame position in cubemap6x1 format. More...
static int	xyz_to_cube1x6 (const V360Context *s, const float *vec, int width, int height, int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
	Calculate frame position in cubemap1x6 format for corresponding 3D coordinates on sphere. More...
static int	xyz_to_cube6x1 (const V360Context *s, const float *vec, int width, int height, int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
	Calculate frame position in cubemap6x1 format for corresponding 3D coordinates on sphere. More...
static int	equirect_to_xyz (const V360Context *s, int i, int j, int width, int height, float *vec)
	Calculate 3D coordinates on sphere for corresponding frame position in equirectangular format. More...
static int	hequirect_to_xyz (const V360Context *s, int i, int j, int width, int height, float *vec)
	Calculate 3D coordinates on sphere for corresponding frame position in half equirectangular format. More...
static int	prepare_stereographic_out (AVFilterContext *ctx)
	Prepare data for processing stereographic output format. More...
static int	stereographic_to_xyz (const V360Context *s, int i, int j, int width, int height, float *vec)
	Calculate 3D coordinates on sphere for corresponding frame position in stereographic format. More...
static int	prepare_stereographic_in (AVFilterContext *ctx)
	Prepare data for processing stereographic input format. More...
static int	xyz_to_stereographic (const V360Context *s, const float *vec, int width, int height, int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
	Calculate frame position in stereographic format for corresponding 3D coordinates on sphere. More...
static int	prepare_equisolid_out (AVFilterContext *ctx)
	Prepare data for processing equisolid output format. More...
static int	equisolid_to_xyz (const V360Context *s, int i, int j, int width, int height, float *vec)
	Calculate 3D coordinates on sphere for corresponding frame position in equisolid format. More...
static int	prepare_equisolid_in (AVFilterContext *ctx)
	Prepare data for processing equisolid input format. More...
static int	xyz_to_equisolid (const V360Context *s, const float *vec, int width, int height, int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
	Calculate frame position in equisolid format for corresponding 3D coordinates on sphere. More...
static int	prepare_orthographic_out (AVFilterContext *ctx)
	Prepare data for processing orthographic output format. More...
static int	orthographic_to_xyz (const V360Context *s, int i, int j, int width, int height, float *vec)
	Calculate 3D coordinates on sphere for corresponding frame position in orthographic format. More...
static int	prepare_orthographic_in (AVFilterContext *ctx)
	Prepare data for processing orthographic input format. More...
static int	xyz_to_orthographic (const V360Context *s, const float *vec, int width, int height, int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
	Calculate frame position in orthographic format for corresponding 3D coordinates on sphere. More...
static int	xyz_to_equirect (const V360Context *s, const float *vec, int width, int height, int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
	Calculate frame position in equirectangular format for corresponding 3D coordinates on sphere. More...
static int	xyz_to_hequirect (const V360Context *s, const float *vec, int width, int height, int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
	Calculate frame position in half equirectangular format for corresponding 3D coordinates on sphere. More...
static int	prepare_flat_in (AVFilterContext *ctx)
	Prepare data for processing flat input format. More...
static int	xyz_to_flat (const V360Context *s, const float *vec, int width, int height, int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
	Calculate frame position in flat format for corresponding 3D coordinates on sphere. More...
static int	xyz_to_mercator (const V360Context *s, const float *vec, int width, int height, int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
	Calculate frame position in mercator format for corresponding 3D coordinates on sphere. More...
static int	mercator_to_xyz (const V360Context *s, int i, int j, int width, int height, float *vec)
	Calculate 3D coordinates on sphere for corresponding frame position in mercator format. More...
static int	xyz_to_ball (const V360Context *s, const float *vec, int width, int height, int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
	Calculate frame position in ball format for corresponding 3D coordinates on sphere. More...
static int	ball_to_xyz (const V360Context *s, int i, int j, int width, int height, float *vec)
	Calculate 3D coordinates on sphere for corresponding frame position in ball format. More...
static int	hammer_to_xyz (const V360Context *s, int i, int j, int width, int height, float *vec)
	Calculate 3D coordinates on sphere for corresponding frame position in hammer format. More...
static int	xyz_to_hammer (const V360Context *s, const float *vec, int width, int height, int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
	Calculate frame position in hammer format for corresponding 3D coordinates on sphere. More...
static int	sinusoidal_to_xyz (const V360Context *s, int i, int j, int width, int height, float *vec)
	Calculate 3D coordinates on sphere for corresponding frame position in sinusoidal format. More...
static int	xyz_to_sinusoidal (const V360Context *s, const float *vec, int width, int height, int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
	Calculate frame position in sinusoidal format for corresponding 3D coordinates on sphere. More...
static int	prepare_eac_in (AVFilterContext *ctx)
	Prepare data for processing equi-angular cubemap input format. More...
static int	prepare_eac_out (AVFilterContext *ctx)
	Prepare data for processing equi-angular cubemap output format. More...
static int	eac_to_xyz (const V360Context *s, int i, int j, int width, int height, float *vec)
	Calculate 3D coordinates on sphere for corresponding frame position in equi-angular cubemap format. More...
static int	xyz_to_eac (const V360Context *s, const float *vec, int width, int height, int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
	Calculate frame position in equi-angular cubemap format for corresponding 3D coordinates on sphere. More...
static int	prepare_flat_out (AVFilterContext *ctx)
	Prepare data for processing flat output format. More...
static int	flat_to_xyz (const V360Context *s, int i, int j, int width, int height, float *vec)
	Calculate 3D coordinates on sphere for corresponding frame position in flat format. More...
static int	prepare_fisheye_out (AVFilterContext *ctx)
	Prepare data for processing fisheye output format. More...
static int	fisheye_to_xyz (const V360Context *s, int i, int j, int width, int height, float *vec)
	Calculate 3D coordinates on sphere for corresponding frame position in fisheye format. More...
static int	prepare_fisheye_in (AVFilterContext *ctx)
	Prepare data for processing fisheye input format. More...
static int	xyz_to_fisheye (const V360Context *s, const float *vec, int width, int height, int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
	Calculate frame position in fisheye format for corresponding 3D coordinates on sphere. More...
static int	pannini_to_xyz (const V360Context *s, int i, int j, int width, int height, float *vec)
	Calculate 3D coordinates on sphere for corresponding frame position in pannini format. More...
static int	xyz_to_pannini (const V360Context *s, const float *vec, int width, int height, int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
	Calculate frame position in pannini format for corresponding 3D coordinates on sphere. More...
static int	prepare_cylindrical_out (AVFilterContext *ctx)
	Prepare data for processing cylindrical output format. More...
static int	cylindrical_to_xyz (const V360Context *s, int i, int j, int width, int height, float *vec)
	Calculate 3D coordinates on sphere for corresponding frame position in cylindrical format. More...
static int	prepare_cylindrical_in (AVFilterContext *ctx)
	Prepare data for processing cylindrical input format. More...
static int	xyz_to_cylindrical (const V360Context *s, const float *vec, int width, int height, int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
	Calculate frame position in cylindrical format for corresponding 3D coordinates on sphere. More...
static int	perspective_to_xyz (const V360Context *s, int i, int j, int width, int height, float *vec)
	Calculate 3D coordinates on sphere for corresponding frame position in perspective format. More...
static int	tetrahedron_to_xyz (const V360Context *s, int i, int j, int width, int height, float *vec)
	Calculate 3D coordinates on sphere for corresponding frame position in tetrahedron format. More...
static int	xyz_to_tetrahedron (const V360Context *s, const float *vec, int width, int height, int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
	Calculate frame position in tetrahedron format for corresponding 3D coordinates on sphere. More...
static int	dfisheye_to_xyz (const V360Context *s, int i, int j, int width, int height, float *vec)
	Calculate 3D coordinates on sphere for corresponding frame position in dual fisheye format. More...
static int	xyz_to_dfisheye (const V360Context *s, const float *vec, int width, int height, int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
	Calculate frame position in dual fisheye format for corresponding 3D coordinates on sphere. More...
static int	barrel_to_xyz (const V360Context *s, int i, int j, int width, int height, float *vec)
	Calculate 3D coordinates on sphere for corresponding frame position in barrel facebook's format. More...
static int	xyz_to_barrel (const V360Context *s, const float *vec, int width, int height, int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
	Calculate frame position in barrel facebook's format for corresponding 3D coordinates on sphere. More...
static int	xyz_to_barrelsplit (const V360Context *s, const float *vec, int width, int height, int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
	Calculate frame position in barrel split facebook's format for corresponding 3D coordinates on sphere. More...
static int	barrelsplit_to_xyz (const V360Context *s, int i, int j, int width, int height, float *vec)
	Calculate 3D coordinates on sphere for corresponding frame position in barrel split facebook's format. More...
static int	tspyramid_to_xyz (const V360Context *s, int i, int j, int width, int height, float *vec)
	Calculate 3D coordinates on sphere for corresponding frame position in tspyramid format. More...
static int	xyz_to_tspyramid (const V360Context *s, const float *vec, int width, int height, int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
	Calculate frame position in tspyramid format for corresponding 3D coordinates on sphere. More...
static int	octahedron_to_xyz (const V360Context *s, int i, int j, int width, int height, float *vec)
	Calculate 3D coordinates on sphere for corresponding frame position in octahedron format. More...
static int	xyz_to_octahedron (const V360Context *s, const float *vec, int width, int height, int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
	Calculate frame position in octahedron format for corresponding 3D coordinates on sphere. More...
static void	multiply_quaternion (float c[4], const float a[4], const float b[4])
static void	conjugate_quaternion (float d[4], const float q[4])
static void	calculate_rotation (float yaw, float pitch, float roll, float rot_quaternion[2][4], const int rotation_order[3])
	Calculate rotation quaternion for yaw/pitch/roll angles. More...
static void	rotate (const float rot_quaternion[2][4], float *vec)
	Rotate vector with given rotation quaternion. More...
static void	set_mirror_modifier (int h_flip, int v_flip, int d_flip, float *modifier)
static void	mirror (const float *modifier, float *vec)
static void	input_flip (int16_t u[4][4], int16_t v[4][4], int w, int h, int hflip, int vflip)
static int	allocate_plane (V360Context *s, int sizeof_uv, int sizeof_ker, int sizeof_mask, int p)
static void	fov_from_dfov (int format, float d_fov, float w, float h, float *h_fov, float *v_fov)
static void	set_dimensions (int *outw, int *outh, int w, int h, const AVPixFmtDescriptor *desc)
static av_always_inline int	v360_slice (AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
static int	config_output (AVFilterLink *outlink)
static int	filter_frame (AVFilterLink *inlink, AVFrame *in)
static int	process_command (AVFilterContext *ctx, const char *cmd, const char *args, char *res, int res_len, int flags)
static av_cold int	init (AVFilterContext *ctx)
static av_cold void	uninit (AVFilterContext *ctx)

Variables
static const AVOption	v360_options []
static const AVFilterPad	inputs []
static const AVFilterPad	outputs []
AVFilter	ff_vf_v360

Detailed Description

360 video conversion filter. Principle of operation:

(for each pixel in output frame) 1) Calculate OpenGL-like coordinates (x, y, z) for pixel position (i, j) 2) Apply 360 operations (rotation, mirror) to (x, y, z) 3) Calculate pixel position (u, v) in input frame 4) Calculate interpolation window and weight for each pixel

(for each frame) 5) Remap input frame to output frame using precalculated data

Definition in file vf_v360.c.

Macro Definition Documentation

OFFSET

#define OFFSET

(

x

)

offsetof(V360Context, x)

Definition at line 53 of file vf_v360.c.

FLAGS

#define FLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

Definition at line 54 of file vf_v360.c.

TFLAGS

#define TFLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM

Definition at line 55 of file vf_v360.c.

DEFINE_REMAP1_LINE

#define DEFINE_REMAP1_LINE	(		bits,
			div
	)

Value:

static void remap1_##bits##bit_line_c(uint8_t *dst, int width, const uint8_t *const src, \
                                      ptrdiff_t in_linesize,                             \
                                      const int16_t *const u, const int16_t *const v,    \
                                      const int16_t *const ker)                          \
{                                                                                        \
    const uint##bits##_t *const s = (const uint##bits##_t *const)src;                    \
    uint##bits##_t *d = (uint##bits##_t *)dst;                                           \
                                                                                         \
    in_linesize /= div;                                                                  \
                                                                                         \
    for (int x = 0; x < width; x++)                                                      \
        d[x] = s[v[x] * in_linesize + u[x]];                                             \
}

Definition at line 254 of file vf_v360.c.

DEFINE_REMAP

#define DEFINE_REMAP	(		ws,
			bits
	)

Generate remapping function with a given window size and pixel depth.

Parameters

ws	size of interpolation window
bits	number of bits per pixel

Definition at line 278 of file vf_v360.c.

DEFINE_REMAP_LINE

#define DEFINE_REMAP_LINE	(		ws,
			bits,
			div
	)

Value:

static void remap##ws##_##bits##bit_line_c(uint8_t *dst, int width, const uint8_t *const src, \
                                           ptrdiff_t in_linesize,                             \
                                           const int16_t *const u, const int16_t *const v,    \
                                           const int16_t *const ker)                          \
{                                                                                             \
    const uint##bits##_t *const s = (const uint##bits##_t *const)src;                         \
    uint##bits##_t *d = (uint##bits##_t *)dst;                                                \
                                                                                              \
    in_linesize /= div;                                                                       \
                                                                                              \
    for (int x = 0; x < width; x++) {                                                         \
        const int16_t *const uu = u + x * ws * ws;                                            \
        const int16_t *const vv = v + x * ws * ws;                                            \
        const int16_t *const kker = ker + x * ws * ws;                                        \
        int tmp = 0;                                                                          \
                                                                                              \
        for (int i = 0; i < ws; i++) {                                                        \
            const int iws = i * ws;                                                           \
            for (int j = 0; j < ws; j++) {                                                    \
                tmp += kker[iws + j] * s[vv[iws + j] * in_linesize + uu[iws + j]];            \
            }                                                                                 \
        }                                                                                     \
                                                                                              \
        d[x] = av_clip_uint##bits(tmp >> 14);                                                 \
    }                                                                                         \
}

Definition at line 334 of file vf_v360.c.

Function Documentation

AVFILTER_DEFINE_CLASS()

AVFILTER_DEFINE_CLASS

(

v360

)

query_formats()

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 170 of file vf_v360.c.

ff_v360_init()

void ff_v360_init	(	V360Context *	s,
		int	depth
	)

Definition at line 369 of file vf_v360.c.

Referenced by config_output().

nearest_kernel()

static void nearest_kernel ( float  du, float  dv, const XYRemap *  rmap, int16_t *  u, int16_t *  v, int16_t *  ker  )

static

Save nearest pixel coordinates for remapping.

Parameters

du	horizontal relative coordinate
dv	vertical relative coordinate
rmap	calculated 4x4 window
u	u remap data
v	v remap data
ker	ker remap data

Definition at line 404 of file vf_v360.c.

Referenced by config_output().

bilinear_kernel()

static void bilinear_kernel ( float  du, float  dv, const XYRemap *  rmap, int16_t *  u, int16_t *  v, int16_t *  ker  )

static

Calculate kernel for bilinear interpolation.

Parameters

du	horizontal relative coordinate
dv	vertical relative coordinate
rmap	calculated 4x4 window
u	u remap data
v	v remap data
ker	ker remap data

Definition at line 424 of file vf_v360.c.

Referenced by config_output().

calculate_lagrange_coeffs()

static void calculate_lagrange_coeffs ( float  t, float *  coeffs  )

inlinestatic

Calculate 1-dimensional lagrange coefficients.

Parameters

t	relative coordinate
coeffs	coefficients

Definition at line 446 of file vf_v360.c.

Referenced by lagrange_kernel().

lagrange_kernel()

static void lagrange_kernel ( float  du, float  dv, const XYRemap *  rmap, int16_t *  u, int16_t *  v, int16_t *  ker  )

static

Calculate kernel for lagrange interpolation.

Parameters

du	horizontal relative coordinate
dv	vertical relative coordinate
rmap	calculated 4x4 window
u	u remap data
v	v remap data
ker	ker remap data

Definition at line 463 of file vf_v360.c.

Referenced by config_output().

calculate_bicubic_coeffs()

static void calculate_bicubic_coeffs ( float  t, float *  coeffs  )

inlinestatic

Calculate 1-dimensional cubic coefficients.

Parameters

t	relative coordinate
coeffs	coefficients

Definition at line 487 of file vf_v360.c.

Referenced by bicubic_kernel().

bicubic_kernel()

static void bicubic_kernel ( float  du, float  dv, const XYRemap *  rmap, int16_t *  u, int16_t *  v, int16_t *  ker  )

static

Calculate kernel for bicubic interpolation.

Parameters

du	horizontal relative coordinate
dv	vertical relative coordinate
rmap	calculated 4x4 window
u	u remap data
v	v remap data
ker	ker remap data

Definition at line 508 of file vf_v360.c.

Referenced by config_output().

calculate_lanczos_coeffs()

static void calculate_lanczos_coeffs ( float  t, float *  coeffs  )

inlinestatic

Calculate 1-dimensional lanczos coefficients.

Parameters

t	relative coordinate
coeffs	coefficients

Definition at line 532 of file vf_v360.c.

Referenced by lanczos_kernel().

lanczos_kernel()

static void lanczos_kernel ( float  du, float  dv, const XYRemap *  rmap, int16_t *  u, int16_t *  v, int16_t *  ker  )

static

Calculate kernel for lanczos interpolation.

Parameters

du	horizontal relative coordinate
dv	vertical relative coordinate
rmap	calculated 4x4 window
u	u remap data
v	v remap data
ker	ker remap data

Definition at line 561 of file vf_v360.c.

Referenced by config_output().

calculate_spline16_coeffs()

static void calculate_spline16_coeffs ( float  t, float *  coeffs  )

static

Calculate 1-dimensional spline16 coefficients.

Parameters

t	relative coordinate
coeffs	coefficients

Definition at line 585 of file vf_v360.c.

Referenced by spline16_kernel().

spline16_kernel()

static void spline16_kernel ( float  du, float  dv, const XYRemap *  rmap, int16_t *  u, int16_t *  v, int16_t *  ker  )

static

Calculate kernel for spline16 interpolation.

Parameters

du	horizontal relative coordinate
dv	vertical relative coordinate
rmap	calculated 4x4 window
u	u remap data
v	v remap data
ker	ker remap data

Definition at line 603 of file vf_v360.c.

Referenced by config_output().

calculate_gaussian_coeffs()

static void calculate_gaussian_coeffs ( float  t, float *  coeffs  )

static

Calculate 1-dimensional gaussian coefficients.

Parameters

t	relative coordinate
coeffs	coefficients

Definition at line 627 of file vf_v360.c.

Referenced by gaussian_kernel().

gaussian_kernel()

static void gaussian_kernel ( float  du, float  dv, const XYRemap *  rmap, int16_t *  u, int16_t *  v, int16_t *  ker  )

static

Calculate kernel for gaussian interpolation.

Parameters

du	horizontal relative coordinate
dv	vertical relative coordinate
rmap	calculated 4x4 window
u	u remap data
v	v remap data
ker	ker remap data

Definition at line 656 of file vf_v360.c.

Referenced by config_output().

calculate_cubic_bc_coeffs()

static void calculate_cubic_bc_coeffs ( float  t, float *  coeffs, float  b, float  c  )

static

Calculate 1-dimensional cubic_bc_spline coefficients.

Parameters

t	relative coordinate
coeffs	coefficients

Definition at line 680 of file vf_v360.c.

Referenced by mitchell_kernel().

mitchell_kernel()

static void mitchell_kernel ( float  du, float  dv, const XYRemap *  rmap, int16_t *  u, int16_t *  v, int16_t *  ker  )

static

Calculate kernel for mitchell interpolation.

Parameters

du	horizontal relative coordinate
dv	vertical relative coordinate
rmap	calculated 4x4 window
u	u remap data
v	v remap data
ker	ker remap data

Definition at line 721 of file vf_v360.c.

Referenced by config_output().

mod()

static int mod ( int  a, int  b  )

inlinestatic

Modulo operation with only positive remainders.

Parameters

a	dividend
b	divisor

Returns

positive remainder of (a / b)

Definition at line 747 of file vf_v360.c.

Referenced by av_compare_mod(), check_extensions(), choose_vlc_set(), draw_sierpinski(), ereflectx(), filter(), l1_unscale(), l2_unscale_group(), mpegaudiodec_common_init_static(), reflectx(), and request_frame().

reflecty()

static int reflecty ( int  y, int  h  )

inlinestatic

Reflect y operation.

Parameters

y	input vertical position
h	input height

Definition at line 763 of file vf_v360.c.

Referenced by xyz_to_equirect(), xyz_to_tetrahedron(), and xyz_to_tspyramid().

ereflectx()

static int ereflectx ( int  x, int  y, int  w, int  h  )

inlinestatic

Reflect x operation for equirect.

Parameters

x	input horizontal position
y	input vertical position
w	input width
h	input height

Definition at line 782 of file vf_v360.c.

Referenced by xyz_to_equirect().

reflectx()

static int reflectx ( int  x, int  y, int  w, int  h  )

inlinestatic

Reflect x operation.

Parameters

x	input horizontal position
y	input vertical position
w	input width
h	input height

Definition at line 798 of file vf_v360.c.

Referenced by xyz_to_tetrahedron(), and xyz_to_tspyramid().

get_direction()

static int get_direction ( char  c )

static

Convert char to corresponding direction.

Used for cubemap options.

Definition at line 810 of file vf_v360.c.

Referenced by prepare_cube_in(), and prepare_cube_out().

get_rotation()

static int get_rotation ( char  c )

static

Convert char to corresponding rotation angle.

Used for cubemap options.

Definition at line 834 of file vf_v360.c.

Referenced by prepare_cube_in(), and prepare_cube_out().

get_rorder()

static int get_rorder ( char  c )

static

Convert char to corresponding rotation order.

Definition at line 853 of file vf_v360.c.

Referenced by config_output().

prepare_cube_in()

static int prepare_cube_in ( AVFilterContext *  ctx )

static

Prepare data for processing cubemap input format.

Parameters

ctx	filter context

Returns

error code

Definition at line 877 of file vf_v360.c.

Referenced by config_output().

prepare_cube_out()

static int prepare_cube_out ( AVFilterContext *  ctx )

static

Prepare data for processing cubemap output format.

Parameters

ctx	filter context

Returns

error code

Definition at line 931 of file vf_v360.c.

Referenced by config_output().

rotate_cube_face()

static void rotate_cube_face ( float *  uf, float *  vf, int  rotation  )

inlinestatic

Definition at line 978 of file vf_v360.c.

Referenced by process_cube_coordinates(), and xyz_to_cube().

rotate_cube_face_inverse()

static void rotate_cube_face_inverse ( float *  uf, float *  vf, int  rotation  )

inlinestatic

Definition at line 1004 of file vf_v360.c.

Referenced by cube_to_xyz(), and process_cube_coordinates().

normalize_vector()

static void normalize_vector ( float *  vec )

static

Normalize vector.

Parameters

vec

vector

Definition at line 1035 of file vf_v360.c.

Referenced by barrel_to_xyz(), barrelsplit_to_xyz(), cube_to_xyz(), cylindrical_to_xyz(), dfisheye_to_xyz(), eac_to_xyz(), equisolid_to_xyz(), fisheye_to_xyz(), flat_to_xyz(), hammer_to_xyz(), octahedron_to_xyz(), orthographic_to_xyz(), pannini_to_xyz(), sinusoidal_to_xyz(), stereographic_to_xyz(), tetrahedron_to_xyz(), tspyramid_to_xyz(), and v360_slice().

cube_to_xyz()

static void cube_to_xyz ( const V360Context *  s, float  uf, float  vf, int  face, float *  vec, float  scalew, float  scaleh  )

static

Calculate 3D coordinates on sphere for corresponding cubemap position.

Common operation for every cubemap.

Parameters

s	filter private context
uf	horizontal cubemap coordinate [0, 1)
vf	vertical cubemap coordinate [0, 1)
face	face of cubemap
vec	coordinates on sphere
scalew	scale for uf
scaleh	scale for vf

Definition at line 1056 of file vf_v360.c.

Referenced by cube1x6_to_xyz(), cube3x2_to_xyz(), and cube6x1_to_xyz().

xyz_to_cube()

static void xyz_to_cube ( const V360Context *  s, const float *  vec, float *  uf, float *  vf, int *  direction  )

static

Calculate cubemap position for corresponding 3D coordinates on sphere.

Common operation for every cubemap.

Parameters

s	filter private context
vec	coordinated on sphere
uf	horizontal cubemap coordinate [0, 1)
vf	vertical cubemap coordinate [0, 1)
direction	direction of view

Definition at line 1120 of file vf_v360.c.

Referenced by xyz_to_cube1x6(), xyz_to_cube3x2(), xyz_to_cube6x1(), xyz_to_eac(), and xyz_to_tspyramid().

process_cube_coordinates()

static void process_cube_coordinates ( const V360Context *  s, float  uf, float  vf, int  direction, float *  new_uf, float *  new_vf, int *  face  )

static

Find position on another cube face in case of overflow/underflow.

Used for calculation of interpolation window.

Parameters

s	filter private context
uf	horizontal cubemap coordinate
vf	vertical cubemap coordinate
direction	direction of view
new_uf	new horizontal cubemap coordinate
new_vf	new vertical cubemap coordinate
face	face position on cubemap

Definition at line 1195 of file vf_v360.c.

Referenced by xyz_to_cube1x6(), xyz_to_cube3x2(), and xyz_to_cube6x1().

cube3x2_to_xyz()

static int cube3x2_to_xyz ( const V360Context *  s, int  i, int  j, int  width, int  height, float *  vec  )

static

Calculate 3D coordinates on sphere for corresponding frame position in cubemap3x2 format.

Parameters

s	filter private context
i	horizontal position on frame [0, width)
j	vertical position on frame [0, height)
width	frame width
height	frame height
vec	coordinates on sphere

Definition at line 1387 of file vf_v360.c.

Referenced by config_output().

xyz_to_cube3x2()

static int xyz_to_cube3x2 ( const V360Context *  s, const float *  vec, int  width, int  height, int16_t  us[4][4], int16_t  vs[4][4], float *  du, float *  dv  )

static

Calculate frame position in cubemap3x2 format for corresponding 3D coordinates on sphere.

Parameters

s	filter private context
vec	coordinates on sphere
width	frame width
height	frame height
us	horizontal coordinates for interpolation window
vs	vertical coordinates for interpolation window
du	horizontal relative coordinate
dv	vertical relative coordinate

Definition at line 1426 of file vf_v360.c.

Referenced by config_output().

cube1x6_to_xyz()

static int cube1x6_to_xyz ( const V360Context *  s, int  i, int  j, int  width, int  height, float *  vec  )

static

Calculate 3D coordinates on sphere for corresponding frame position in cubemap1x6 format.

Parameters

s	filter private context
i	horizontal position on frame [0, width)
j	vertical position on frame [0, height)
width	frame width
height	frame height
vec	coordinates on sphere

Definition at line 1515 of file vf_v360.c.

Referenced by config_output().

cube6x1_to_xyz()

static int cube6x1_to_xyz ( const V360Context *  s, int  i, int  j, int  width, int  height, float *  vec  )

static

Calculate 3D coordinates on sphere for corresponding frame position in cubemap6x1 format.

Parameters

s	filter private context
i	horizontal position on frame [0, width)
j	vertical position on frame [0, height)
width	frame width
height	frame height
vec	coordinates on sphere

Definition at line 1548 of file vf_v360.c.

Referenced by config_output().

xyz_to_cube1x6()

static int xyz_to_cube1x6 ( const V360Context *  s, const float *  vec, int  width, int  height, int16_t  us[4][4], int16_t  vs[4][4], float *  du, float *  dv  )

static

Calculate frame position in cubemap1x6 format for corresponding 3D coordinates on sphere.

Parameters

s	filter private context
vec	coordinates on sphere
width	frame width
height	frame height
us	horizontal coordinates for interpolation window
vs	vertical coordinates for interpolation window
du	horizontal relative coordinate
dv	vertical relative coordinate

Definition at line 1583 of file vf_v360.c.

Referenced by config_output().

xyz_to_cube6x1()

static int xyz_to_cube6x1 ( const V360Context *  s, const float *  vec, int  width, int  height, int16_t  us[4][4], int16_t  vs[4][4], float *  du, float *  dv  )

static

Calculate frame position in cubemap6x1 format for corresponding 3D coordinates on sphere.

Parameters

s	filter private context
vec	coordinates on sphere
width	frame width
height	frame height
us	horizontal coordinates for interpolation window
vs	vertical coordinates for interpolation window
du	horizontal relative coordinate
dv	vertical relative coordinate

Definition at line 1663 of file vf_v360.c.

Referenced by config_output().

equirect_to_xyz()

static int equirect_to_xyz ( const V360Context *  s, int  i, int  j, int  width, int  height, float *  vec  )

static

Calculate 3D coordinates on sphere for corresponding frame position in equirectangular format.

Parameters

s	filter private context
i	horizontal position on frame [0, width)
j	vertical position on frame [0, height)
width	frame width
height	frame height
vec	coordinates on sphere

Definition at line 1741 of file vf_v360.c.

Referenced by config_output().

hequirect_to_xyz()

static int hequirect_to_xyz ( const V360Context *  s, int  i, int  j, int  width, int  height, float *  vec  )

static

Calculate 3D coordinates on sphere for corresponding frame position in half equirectangular format.

Parameters

s	filter private context
i	horizontal position on frame [0, width)
j	vertical position on frame [0, height)
width	frame width
height	frame height
vec	coordinates on sphere

Definition at line 1770 of file vf_v360.c.

Referenced by config_output().

prepare_stereographic_out()

static int prepare_stereographic_out ( AVFilterContext *  ctx )

static

Prepare data for processing stereographic output format.

Parameters

ctx	filter context

Returns

error code

Definition at line 1796 of file vf_v360.c.

Referenced by config_output().

stereographic_to_xyz()

static int stereographic_to_xyz ( const V360Context *  s, int  i, int  j, int  width, int  height, float *  vec  )

static

Calculate 3D coordinates on sphere for corresponding frame position in stereographic format.

Parameters

s	filter private context
i	horizontal position on frame [0, width)
j	vertical position on frame [0, height)
width	frame width
height	frame height
vec	coordinates on sphere

Definition at line 1816 of file vf_v360.c.

Referenced by config_output().

prepare_stereographic_in()

static int prepare_stereographic_in ( AVFilterContext *  ctx )

static

Prepare data for processing stereographic input format.

Parameters

ctx	filter context

Returns

error code

Definition at line 1842 of file vf_v360.c.

Referenced by config_output().

xyz_to_stereographic()

static int xyz_to_stereographic ( const V360Context *  s, const float *  vec, int  width, int  height, int16_t  us[4][4], int16_t  vs[4][4], float *  du, float *  dv  )

static

Calculate frame position in stereographic format for corresponding 3D coordinates on sphere.

Parameters

s	filter private context
vec	coordinates on sphere
width	frame width
height	frame height
us	horizontal coordinates for interpolation window
vs	vertical coordinates for interpolation window
du	horizontal relative coordinate
dv	vertical relative coordinate

Definition at line 1864 of file vf_v360.c.

Referenced by config_output().

prepare_equisolid_out()

static int prepare_equisolid_out ( AVFilterContext *  ctx )

static

Prepare data for processing equisolid output format.

Parameters

ctx	filter context

Returns

error code

Definition at line 1902 of file vf_v360.c.

Referenced by config_output().

equisolid_to_xyz()

static int equisolid_to_xyz ( const V360Context *  s, int  i, int  j, int  width, int  height, float *  vec  )

static

Calculate 3D coordinates on sphere for corresponding frame position in equisolid format.

Parameters

s	filter private context
i	horizontal position on frame [0, width)
j	vertical position on frame [0, height)
width	frame width
height	frame height
vec	coordinates on sphere

Definition at line 1922 of file vf_v360.c.

Referenced by config_output().

prepare_equisolid_in()

static int prepare_equisolid_in ( AVFilterContext *  ctx )

static

Prepare data for processing equisolid input format.

Parameters

ctx	filter context

Returns

error code

Definition at line 1948 of file vf_v360.c.

Referenced by config_output().

xyz_to_equisolid()

static int xyz_to_equisolid ( const V360Context *  s, const float *  vec, int  width, int  height, int16_t  us[4][4], int16_t  vs[4][4], float *  du, float *  dv  )

static

Calculate frame position in equisolid format for corresponding 3D coordinates on sphere.

Parameters

s	filter private context
vec	coordinates on sphere
width	frame width
height	frame height
us	horizontal coordinates for interpolation window
vs	vertical coordinates for interpolation window
du	horizontal relative coordinate
dv	vertical relative coordinate

Definition at line 1970 of file vf_v360.c.

Referenced by config_output().

prepare_orthographic_out()

static int prepare_orthographic_out ( AVFilterContext *  ctx )

static

Prepare data for processing orthographic output format.

Parameters

ctx	filter context

Returns

error code

Definition at line 2008 of file vf_v360.c.

Referenced by config_output().

orthographic_to_xyz()

static int orthographic_to_xyz ( const V360Context *  s, int  i, int  j, int  width, int  height, float *  vec  )

static

Calculate 3D coordinates on sphere for corresponding frame position in orthographic format.

Parameters

s	filter private context
i	horizontal position on frame [0, width)
j	vertical position on frame [0, height)
width	frame width
height	frame height
vec	coordinates on sphere

Definition at line 2028 of file vf_v360.c.

Referenced by config_output().

prepare_orthographic_in()

static int prepare_orthographic_in ( AVFilterContext *  ctx )

static

Prepare data for processing orthographic input format.

Parameters

ctx	filter context

Returns

error code

Definition at line 2053 of file vf_v360.c.

Referenced by config_output().

xyz_to_orthographic()

static int xyz_to_orthographic ( const V360Context *  s, const float *  vec, int  width, int  height, int16_t  us[4][4], int16_t  vs[4][4], float *  du, float *  dv  )

static

Calculate frame position in orthographic format for corresponding 3D coordinates on sphere.

Parameters

s	filter private context
vec	coordinates on sphere
width	frame width
height	frame height
us	horizontal coordinates for interpolation window
vs	vertical coordinates for interpolation window
du	horizontal relative coordinate
dv	vertical relative coordinate

Definition at line 2075 of file vf_v360.c.

Referenced by config_output().

xyz_to_equirect()

static int xyz_to_equirect ( const V360Context *  s, const float *  vec, int  width, int  height, int16_t  us[4][4], int16_t  vs[4][4], float *  du, float *  dv  )

static

Calculate frame position in equirectangular format for corresponding 3D coordinates on sphere.

Parameters

s	filter private context
vec	coordinates on sphere
width	frame width
height	frame height
us	horizontal coordinates for interpolation window
vs	vertical coordinates for interpolation window
du	horizontal relative coordinate
dv	vertical relative coordinate

Definition at line 2118 of file vf_v360.c.

Referenced by config_output().

xyz_to_hequirect()

static int xyz_to_hequirect ( const V360Context *  s, const float *  vec, int  width, int  height, int16_t  us[4][4], int16_t  vs[4][4], float *  du, float *  dv  )

static

Calculate frame position in half equirectangular format for corresponding 3D coordinates on sphere.

Parameters

s	filter private context
vec	coordinates on sphere
width	frame width
height	frame height
us	horizontal coordinates for interpolation window
vs	vertical coordinates for interpolation window
du	horizontal relative coordinate
dv	vertical relative coordinate

Definition at line 2156 of file vf_v360.c.

Referenced by config_output().

prepare_flat_in()

static int prepare_flat_in ( AVFilterContext *  ctx )

static

Prepare data for processing flat input format.

Parameters

ctx	filter context

Returns

error code

Definition at line 2191 of file vf_v360.c.

Referenced by config_output().

xyz_to_flat()

static int xyz_to_flat ( const V360Context *  s, const float *  vec, int  width, int  height, int16_t  us[4][4], int16_t  vs[4][4], float *  du, float *  dv  )

static

Calculate frame position in flat format for corresponding 3D coordinates on sphere.

Parameters

s	filter private context
vec	coordinates on sphere
width	frame width
height	frame height
us	horizontal coordinates for interpolation window
vs	vertical coordinates for interpolation window
du	horizontal relative coordinate
dv	vertical relative coordinate

Definition at line 2213 of file vf_v360.c.

Referenced by config_output().

xyz_to_mercator()

static int xyz_to_mercator ( const V360Context *  s, const float *  vec, int  width, int  height, int16_t  us[4][4], int16_t  vs[4][4], float *  du, float *  dv  )

static

Calculate frame position in mercator format for corresponding 3D coordinates on sphere.

Parameters

s	filter private context
vec	coordinates on sphere
width	frame width
height	frame height
us	horizontal coordinates for interpolation window
vs	vertical coordinates for interpolation window
du	horizontal relative coordinate
dv	vertical relative coordinate

Definition at line 2260 of file vf_v360.c.

Referenced by config_output().

mercator_to_xyz()

static int mercator_to_xyz ( const V360Context *  s, int  i, int  j, int  width, int  height, float *  vec  )

static

Calculate 3D coordinates on sphere for corresponding frame position in mercator format.

Parameters

s	filter private context
i	horizontal position on frame [0, width)
j	vertical position on frame [0, height)
width	frame width
height	frame height
vec	coordinates on sphere

Definition at line 2296 of file vf_v360.c.

Referenced by config_output().

xyz_to_ball()

static int xyz_to_ball ( const V360Context *  s, const float *  vec, int  width, int  height, int16_t  us[4][4], int16_t  vs[4][4], float *  du, float *  dv  )

static

Calculate frame position in ball format for corresponding 3D coordinates on sphere.

Parameters

s	filter private context
vec	coordinates on sphere
width	frame width
height	frame height
us	horizontal coordinates for interpolation window
vs	vertical coordinates for interpolation window
du	horizontal relative coordinate
dv	vertical relative coordinate

Definition at line 2328 of file vf_v360.c.

Referenced by config_output().

ball_to_xyz()

static int ball_to_xyz ( const V360Context *  s, int  i, int  j, int  width, int  height, float *  vec  )

static

Calculate 3D coordinates on sphere for corresponding frame position in ball format.

Parameters

s	filter private context
i	horizontal position on frame [0, width)
j	vertical position on frame [0, height)
width	frame width
height	frame height
vec	coordinates on sphere

Definition at line 2364 of file vf_v360.c.

Referenced by config_output().

hammer_to_xyz()

static int hammer_to_xyz ( const V360Context *  s, int  i, int  j, int  width, int  height, float *  vec  )

static

Calculate 3D coordinates on sphere for corresponding frame position in hammer format.

Parameters

s	filter private context
i	horizontal position on frame [0, width)
j	vertical position on frame [0, height)
width	frame width
height	frame height
vec	coordinates on sphere

Definition at line 2398 of file vf_v360.c.

Referenced by config_output().

xyz_to_hammer()

static int xyz_to_hammer ( const V360Context *  s, const float *  vec, int  width, int  height, int16_t  us[4][4], int16_t  vs[4][4], float *  du, float *  dv  )

static

Calculate frame position in hammer format for corresponding 3D coordinates on sphere.

Parameters

s	filter private context
vec	coordinates on sphere
width	frame width
height	frame height
us	horizontal coordinates for interpolation window
vs	vertical coordinates for interpolation window
du	horizontal relative coordinate
dv	vertical relative coordinate

Definition at line 2439 of file vf_v360.c.

Referenced by config_output().

sinusoidal_to_xyz()

static int sinusoidal_to_xyz ( const V360Context *  s, int  i, int  j, int  width, int  height, float *  vec  )

static

Calculate 3D coordinates on sphere for corresponding frame position in sinusoidal format.

Parameters

s	filter private context
i	horizontal position on frame [0, width)
j	vertical position on frame [0, height)
width	frame width
height	frame height
vec	coordinates on sphere

Definition at line 2478 of file vf_v360.c.

Referenced by config_output().

xyz_to_sinusoidal()

static int xyz_to_sinusoidal ( const V360Context *  s, const float *  vec, int  width, int  height, int16_t  us[4][4], int16_t  vs[4][4], float *  du, float *  dv  )

static

Calculate frame position in sinusoidal format for corresponding 3D coordinates on sphere.

Parameters

s	filter private context
vec	coordinates on sphere
width	frame width
height	frame height
us	horizontal coordinates for interpolation window
vs	vertical coordinates for interpolation window
du	horizontal relative coordinate
dv	vertical relative coordinate

Definition at line 2511 of file vf_v360.c.

Referenced by config_output().

prepare_eac_in()

static int prepare_eac_in ( AVFilterContext *  ctx )

static

Prepare data for processing equi-angular cubemap input format.

Parameters

ctx	filter context

Returns

error code

Definition at line 2544 of file vf_v360.c.

Referenced by config_output().

prepare_eac_out()

static int prepare_eac_out ( AVFilterContext *  ctx )

static

Prepare data for processing equi-angular cubemap output format.

Parameters

ctx	filter context

Returns

error code

Definition at line 2572 of file vf_v360.c.

Referenced by config_output().

eac_to_xyz()

static int eac_to_xyz ( const V360Context *  s, int  i, int  j, int  width, int  height, float *  vec  )

static

Calculate 3D coordinates on sphere for corresponding frame position in equi-angular cubemap format.

Parameters

s	filter private context
i	horizontal position on frame [0, width)
j	vertical position on frame [0, height)
width	frame width
height	frame height
vec	coordinates on sphere

Definition at line 2603 of file vf_v360.c.

Referenced by config_output().

xyz_to_eac()

static int xyz_to_eac ( const V360Context *  s, const float *  vec, int  width, int  height, int16_t  us[4][4], int16_t  vs[4][4], float *  du, float *  dv  )

static

Calculate frame position in equi-angular cubemap format for corresponding 3D coordinates on sphere.

Parameters

s	filter private context
vec	coordinates on sphere
width	frame width
height	frame height
us	horizontal coordinates for interpolation window
vs	vertical coordinates for interpolation window
du	horizontal relative coordinate
dv	vertical relative coordinate

Definition at line 2708 of file vf_v360.c.

Referenced by config_output().

prepare_flat_out()

static int prepare_flat_out ( AVFilterContext *  ctx )

static

Prepare data for processing flat output format.

Parameters

ctx	filter context

Returns

error code

Definition at line 2763 of file vf_v360.c.

Referenced by config_output().

flat_to_xyz()

static int flat_to_xyz ( const V360Context *  s, int  i, int  j, int  width, int  height, float *  vec  )

static

Calculate 3D coordinates on sphere for corresponding frame position in flat format.

Parameters

s	filter private context
i	horizontal position on frame [0, width)
j	vertical position on frame [0, height)
width	frame width
height	frame height
vec	coordinates on sphere

Definition at line 2783 of file vf_v360.c.

Referenced by config_output().

prepare_fisheye_out()

static int prepare_fisheye_out ( AVFilterContext *  ctx )

static

Prepare data for processing fisheye output format.

Parameters

ctx	filter context

Returns

error code

Definition at line 2806 of file vf_v360.c.

Referenced by config_output().

fisheye_to_xyz()

static int fisheye_to_xyz ( const V360Context *  s, int  i, int  j, int  width, int  height, float *  vec  )

static

Calculate 3D coordinates on sphere for corresponding frame position in fisheye format.

Parameters

s	filter private context
i	horizontal position on frame [0, width)
j	vertical position on frame [0, height)
width	frame width
height	frame height
vec	coordinates on sphere

Definition at line 2826 of file vf_v360.c.

Referenced by config_output().

prepare_fisheye_in()

static int prepare_fisheye_in ( AVFilterContext *  ctx )

static

Prepare data for processing fisheye input format.

Parameters

ctx	filter context

Returns

error code

Definition at line 2857 of file vf_v360.c.

Referenced by config_output().

xyz_to_fisheye()

static int xyz_to_fisheye ( const V360Context *  s, const float *  vec, int  width, int  height, int16_t  us[4][4], int16_t  vs[4][4], float *  du, float *  dv  )

static

Calculate frame position in fisheye format for corresponding 3D coordinates on sphere.

Parameters

s	filter private context
vec	coordinates on sphere
width	frame width
height	frame height
us	horizontal coordinates for interpolation window
vs	vertical coordinates for interpolation window
du	horizontal relative coordinate
dv	vertical relative coordinate

Definition at line 2879 of file vf_v360.c.

Referenced by config_output().

pannini_to_xyz()

static int pannini_to_xyz ( const V360Context *  s, int  i, int  j, int  width, int  height, float *  vec  )

static

Calculate 3D coordinates on sphere for corresponding frame position in pannini format.

Parameters

s	filter private context
i	horizontal position on frame [0, width)
j	vertical position on frame [0, height)
width	frame width
height	frame height
vec	coordinates on sphere

Definition at line 2922 of file vf_v360.c.

Referenced by config_output().

xyz_to_pannini()

static int xyz_to_pannini ( const V360Context *  s, const float *  vec, int  width, int  height, int16_t  us[4][4], int16_t  vs[4][4], float *  du, float *  dv  )

static

Calculate frame position in pannini format for corresponding 3D coordinates on sphere.

Parameters

s	filter private context
vec	coordinates on sphere
width	frame width
height	frame height
us	horizontal coordinates for interpolation window
vs	vertical coordinates for interpolation window
du	horizontal relative coordinate
dv	vertical relative coordinate

Definition at line 2958 of file vf_v360.c.

Referenced by config_output().

prepare_cylindrical_out()

static int prepare_cylindrical_out ( AVFilterContext *  ctx )

static

Prepare data for processing cylindrical output format.

Parameters

ctx	filter context

Returns

error code

Definition at line 2999 of file vf_v360.c.

Referenced by config_output().

cylindrical_to_xyz()

static int cylindrical_to_xyz ( const V360Context *  s, int  i, int  j, int  width, int  height, float *  vec  )

static

Calculate 3D coordinates on sphere for corresponding frame position in cylindrical format.

Parameters

s	filter private context
i	horizontal position on frame [0, width)
j	vertical position on frame [0, height)
width	frame width
height	frame height
vec	coordinates on sphere

Definition at line 3019 of file vf_v360.c.

Referenced by config_output().

prepare_cylindrical_in()

static int prepare_cylindrical_in ( AVFilterContext *  ctx )

static

Prepare data for processing cylindrical input format.

Parameters

ctx	filter context

Returns

error code

Definition at line 3050 of file vf_v360.c.

Referenced by config_output().

xyz_to_cylindrical()

static int xyz_to_cylindrical ( const V360Context *  s, const float *  vec, int  width, int  height, int16_t  us[4][4], int16_t  vs[4][4], float *  du, float *  dv  )

static

Calculate frame position in cylindrical format for corresponding 3D coordinates on sphere.

Parameters

s	filter private context
vec	coordinates on sphere
width	frame width
height	frame height
us	horizontal coordinates for interpolation window
vs	vertical coordinates for interpolation window
du	horizontal relative coordinate
dv	vertical relative coordinate

Definition at line 3072 of file vf_v360.c.

Referenced by config_output().

perspective_to_xyz()

static int perspective_to_xyz ( const V360Context *  s, int  i, int  j, int  width, int  height, float *  vec  )

static

Calculate 3D coordinates on sphere for corresponding frame position in perspective format.

Parameters

s	filter private context
i	horizontal position on frame [0, width)
j	vertical position on frame [0, height)
width	frame width
height	frame height
vec	coordinates on sphere

Definition at line 3112 of file vf_v360.c.

Referenced by config_output().

tetrahedron_to_xyz()

static int tetrahedron_to_xyz ( const V360Context *  s, int  i, int  j, int  width, int  height, float *  vec  )

static

Calculate 3D coordinates on sphere for corresponding frame position in tetrahedron format.

Parameters

s	filter private context
i	horizontal position on frame [0, width)
j	vertical position on frame [0, height)
width	frame width
height	frame height
vec	coordinates on sphere

Definition at line 3158 of file vf_v360.c.

Referenced by config_output().

xyz_to_tetrahedron()

static int xyz_to_tetrahedron ( const V360Context *  s, const float *  vec, int  width, int  height, int16_t  us[4][4], int16_t  vs[4][4], float *  du, float *  dv  )

static

Calculate frame position in tetrahedron format for corresponding 3D coordinates on sphere.

Parameters

s	filter private context
vec	coordinates on sphere
width	frame width
height	frame height
us	horizontal coordinates for interpolation window
vs	vertical coordinates for interpolation window
du	horizontal relative coordinate
dv	vertical relative coordinate

Definition at line 3186 of file vf_v360.c.

Referenced by config_output().

dfisheye_to_xyz()

static int dfisheye_to_xyz ( const V360Context *  s, int  i, int  j, int  width, int  height, float *  vec  )

static

Calculate 3D coordinates on sphere for corresponding frame position in dual fisheye format.

Parameters

s	filter private context
i	horizontal position on frame [0, width)
j	vertical position on frame [0, height)
width	frame width
height	frame height
vec	coordinates on sphere

Definition at line 3241 of file vf_v360.c.

Referenced by config_output().

xyz_to_dfisheye()

static int xyz_to_dfisheye ( const V360Context *  s, const float *  vec, int  width, int  height, int16_t  us[4][4], int16_t  vs[4][4], float *  du, float *  dv  )

static

Calculate frame position in dual fisheye format for corresponding 3D coordinates on sphere.

Parameters

s	filter private context
vec	coordinates on sphere
width	frame width
height	frame height
us	horizontal coordinates for interpolation window
vs	vertical coordinates for interpolation window
du	horizontal relative coordinate
dv	vertical relative coordinate

Definition at line 3282 of file vf_v360.c.

Referenced by config_output().

barrel_to_xyz()

static int barrel_to_xyz ( const V360Context *  s, int  i, int  j, int  width, int  height, float *  vec  )

static

Calculate 3D coordinates on sphere for corresponding frame position in barrel facebook's format.

Parameters

s	filter private context
i	horizontal position on frame [0, width)
j	vertical position on frame [0, height)
width	frame width
height	frame height
vec	coordinates on sphere

Definition at line 3332 of file vf_v360.c.

Referenced by config_output().

xyz_to_barrel()

static int xyz_to_barrel ( const V360Context *  s, const float *  vec, int  width, int  height, int16_t  us[4][4], int16_t  vs[4][4], float *  du, float *  dv  )

static

Calculate frame position in barrel facebook's format for corresponding 3D coordinates on sphere.

Parameters

s	filter private context
vec	coordinates on sphere
width	frame width
height	frame height
us	horizontal coordinates for interpolation window
vs	vertical coordinates for interpolation window
du	horizontal relative coordinate
dv	vertical relative coordinate

Definition at line 3406 of file vf_v360.c.

Referenced by config_output().

xyz_to_barrelsplit()

static int xyz_to_barrelsplit ( const V360Context *  s, const float *  vec, int  width, int  height, int16_t  us[4][4], int16_t  vs[4][4], float *  du, float *  dv  )

static

Calculate frame position in barrel split facebook's format for corresponding 3D coordinates on sphere.

Parameters

s	filter private context
vec	coordinates on sphere
width	frame width
height	frame height
us	horizontal coordinates for interpolation window
vs	vertical coordinates for interpolation window
du	horizontal relative coordinate
dv	vertical relative coordinate

Definition at line 3478 of file vf_v360.c.

Referenced by config_output().

barrelsplit_to_xyz()

static int barrelsplit_to_xyz ( const V360Context *  s, int  i, int  j, int  width, int  height, float *  vec  )

static

Calculate 3D coordinates on sphere for corresponding frame position in barrel split facebook's format.

Parameters

s	filter private context
i	horizontal position on frame [0, width)
j	vertical position on frame [0, height)
width	frame width
height	frame height
vec	coordinates on sphere

Definition at line 3572 of file vf_v360.c.

Referenced by config_output().

tspyramid_to_xyz()

static int tspyramid_to_xyz ( const V360Context *  s, int  i, int  j, int  width, int  height, float *  vec  )

static

Calculate 3D coordinates on sphere for corresponding frame position in tspyramid format.

Parameters

s	filter private context
i	horizontal position on frame [0, width)
j	vertical position on frame [0, height)
width	frame width
height	frame height
vec	coordinates on sphere

Definition at line 3662 of file vf_v360.c.

Referenced by config_output().

xyz_to_tspyramid()

static int xyz_to_tspyramid ( const V360Context *  s, const float *  vec, int  width, int  height, int16_t  us[4][4], int16_t  vs[4][4], float *  du, float *  dv  )

static

Calculate frame position in tspyramid format for corresponding 3D coordinates on sphere.

Parameters

s	filter private context
vec	coordinates on sphere
width	frame width
height	frame height
us	horizontal coordinates for interpolation window
vs	vertical coordinates for interpolation window
du	horizontal relative coordinate
dv	vertical relative coordinate

Definition at line 3722 of file vf_v360.c.

Referenced by config_output().

octahedron_to_xyz()

static int octahedron_to_xyz ( const V360Context *  s, int  i, int  j, int  width, int  height, float *  vec  )

static

Calculate 3D coordinates on sphere for corresponding frame position in octahedron format.

Parameters

s	filter private context
i	horizontal position on frame [0, width)
j	vertical position on frame [0, height)
width	frame width
height	frame height
vec	coordinates on sphere

Definition at line 3790 of file vf_v360.c.

Referenced by config_output().

xyz_to_octahedron()

static int xyz_to_octahedron ( const V360Context *  s, const float *  vec, int  width, int  height, int16_t  us[4][4], int16_t  vs[4][4], float *  du, float *  dv  )

static

Calculate frame position in octahedron format for corresponding 3D coordinates on sphere.

Parameters

s	filter private context
vec	coordinates on sphere
width	frame width
height	frame height
us	horizontal coordinates for interpolation window
vs	vertical coordinates for interpolation window
du	horizontal relative coordinate
dv	vertical relative coordinate

Definition at line 3825 of file vf_v360.c.

Referenced by config_output().

multiply_quaternion()

static void multiply_quaternion ( float  c[4], const float  a[4], const float  b[4]  )

static

Definition at line 3865 of file vf_v360.c.

Referenced by calculate_rotation(), and rotate().

conjugate_quaternion()

static void conjugate_quaternion ( float  d[4], const float  q[4]  )

static

Definition at line 3873 of file vf_v360.c.

Referenced by calculate_rotation().

calculate_rotation()

static void calculate_rotation ( float  yaw, float  pitch, float  roll, float  rot_quaternion[2][4], const int  rotation_order[3]  )

inlinestatic

Calculate rotation quaternion for yaw/pitch/roll angles.

Definition at line 3884 of file vf_v360.c.

Referenced by config_output().

rotate()

static void rotate ( const float  rot_quaternion[2][4], float *  vec  )

inlinestatic

Rotate vector with given rotation quaternion.

Parameters

rot_quaternion	rotation quaternion
vec	vector

Definition at line 3919 of file vf_v360.c.

Referenced by hq3x_interp_2x1(), mov_read_tkhd(), and v360_slice().

set_mirror_modifier()

static void set_mirror_modifier ( int  h_flip, int  v_flip, int  d_flip, float *  modifier  )

inlinestatic

Definition at line 3937 of file vf_v360.c.

Referenced by config_output().

mirror()

static void mirror ( const float *  modifier, float *  vec  )

inlinestatic

Definition at line 3945 of file vf_v360.c.

Referenced by acolor(), acolor16(), chroma(), chroma16(), color(), color16(), flat(), flat16(), lowpass(), lowpass16(), and v360_slice().

input_flip()

static void input_flip ( int16_t  u[4][4], int16_t  v[4][4], int  w, int  h, int  hflip, int  vflip  )

inlinestatic

Definition at line 3952 of file vf_v360.c.

Referenced by v360_slice().

allocate_plane()

static int allocate_plane ( V360Context *  s, int  sizeof_uv, int  sizeof_ker, int  sizeof_mask, int  p  )

static

Definition at line 3969 of file vf_v360.c.

Referenced by config_output().

fov_from_dfov()

static void fov_from_dfov ( int  format, float  d_fov, float  w, float  h, float *  h_fov, float *  v_fov  )

static

Definition at line 4003 of file vf_v360.c.

Referenced by config_output().

set_dimensions()

static void set_dimensions ( int *  outw, int *  outh, int  w, int  h, const AVPixFmtDescriptor *  desc  )

static

Definition at line 4072 of file vf_v360.c.

Referenced by config_output().

v360_slice()

static av_always_inline int v360_slice ( AVFilterContext *  ctx, void *  arg, int  jobnr, int  nb_jobs  )

static

Definition at line 4081 of file vf_v360.c.

Referenced by config_output().

config_output()

static int config_output ( AVFilterLink *  outlink )

static

Definition at line 4140 of file vf_v360.c.

Referenced by process_command().

filter_frame()

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

static

Definition at line 4682 of file vf_v360.c.

process_command()

static int process_command ( AVFilterContext *  ctx, const char *  cmd, const char *  args, char *  res, int  res_len, int  flags  )

static

Definition at line 4706 of file vf_v360.c.

init()

static av_cold int init ( AVFilterContext *  ctx )

static

Definition at line 4721 of file vf_v360.c.

uninit()

static av_cold void uninit ( AVFilterContext *  ctx )

static

Definition at line 4731 of file vf_v360.c.

Variable Documentation

v360_options

const AVOption v360_options[]

static

Definition at line 57 of file vf_v360.c.

inputs

const AVFilterPad inputs[]

static

Initial value:

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

Definition at line 4750 of file vf_v360.c.

outputs

const AVFilterPad outputs[]

static

Initial value:

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

Definition at line 4759 of file vf_v360.c.

ff_vf_v360

AVFilter ff_vf_v360

Initial value:

= {
    .name          = "v360",
    .description   = NULL_IF_CONFIG_SMALL("Convert 360 projection of video."),
    .priv_size     = sizeof(V360Context),
    .init          = init,
    .uninit        = uninit,
    .query_formats = query_formats,
    .inputs        = inputs,
    .outputs       = outputs,
    .priv_class    = &v360_class,
    .flags         = AVFILTER_FLAG_SLICE_THREADS,
    .process_command = process_command,
}

Definition at line 4768 of file vf_v360.c.