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FFmpeg/libavfilter/vf_v360.c
Andreas Rheinhardt 790f793844 avutil/common: Don't auto-include mem.h 
There are lots of files that don't need it: The number of object
files that actually need it went down from 2011 to 884 here.

Keep it for external users in order to not cause breakages.

Also improve the other headers a bit while just at it.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-03-31 00:08:43 +01:00

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/*
* Copyright (c) 2019 Eugene Lyapustin
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* 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
*/
#include <math.h>
#include "libavutil/avassert.h"
#include "libavutil/mem.h"
#include "libavutil/pixdesc.h"
#include "libavutil/opt.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
#include "v360.h"
typedef struct ThreadData {
AVFrame *in;
AVFrame *out;
} ThreadData;
#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
static const AVOption v360_options[] = {
{ "input", "set input projection", OFFSET(in), AV_OPT_TYPE_INT, {.i64=EQUIRECTANGULAR}, 0, NB_PROJECTIONS-1, FLAGS, .unit = "in" },
{ "e", "equirectangular", 0, AV_OPT_TYPE_CONST, {.i64=EQUIRECTANGULAR}, 0, 0, FLAGS, .unit = "in" },
{ "equirect", "equirectangular", 0, AV_OPT_TYPE_CONST, {.i64=EQUIRECTANGULAR}, 0, 0, FLAGS, .unit = "in" },
{ "c3x2", "cubemap 3x2", 0, AV_OPT_TYPE_CONST, {.i64=CUBEMAP_3_2}, 0, 0, FLAGS, .unit = "in" },
{ "c6x1", "cubemap 6x1", 0, AV_OPT_TYPE_CONST, {.i64=CUBEMAP_6_1}, 0, 0, FLAGS, .unit = "in" },
{ "eac", "equi-angular cubemap", 0, AV_OPT_TYPE_CONST, {.i64=EQUIANGULAR}, 0, 0, FLAGS, .unit = "in" },
{ "dfisheye", "dual fisheye", 0, AV_OPT_TYPE_CONST, {.i64=DUAL_FISHEYE}, 0, 0, FLAGS, .unit = "in" },
{ "flat", "regular video", 0, AV_OPT_TYPE_CONST, {.i64=FLAT}, 0, 0, FLAGS, .unit = "in" },
{"rectilinear", "regular video", 0, AV_OPT_TYPE_CONST, {.i64=FLAT}, 0, 0, FLAGS, .unit = "in" },
{ "gnomonic", "regular video", 0, AV_OPT_TYPE_CONST, {.i64=FLAT}, 0, 0, FLAGS, .unit = "in" },
{ "barrel", "barrel facebook's 360 format", 0, AV_OPT_TYPE_CONST, {.i64=BARREL}, 0, 0, FLAGS, .unit = "in" },
{ "fb", "barrel facebook's 360 format", 0, AV_OPT_TYPE_CONST, {.i64=BARREL}, 0, 0, FLAGS, .unit = "in" },
{ "c1x6", "cubemap 1x6", 0, AV_OPT_TYPE_CONST, {.i64=CUBEMAP_1_6}, 0, 0, FLAGS, .unit = "in" },
{ "sg", "stereographic", 0, AV_OPT_TYPE_CONST, {.i64=STEREOGRAPHIC}, 0, 0, FLAGS, .unit = "in" },
{ "mercator", "mercator", 0, AV_OPT_TYPE_CONST, {.i64=MERCATOR}, 0, 0, FLAGS, .unit = "in" },
{ "ball", "ball", 0, AV_OPT_TYPE_CONST, {.i64=BALL}, 0, 0, FLAGS, .unit = "in" },
{ "hammer", "hammer", 0, AV_OPT_TYPE_CONST, {.i64=HAMMER}, 0, 0, FLAGS, .unit = "in" },
{"sinusoidal", "sinusoidal", 0, AV_OPT_TYPE_CONST, {.i64=SINUSOIDAL}, 0, 0, FLAGS, .unit = "in" },
{ "fisheye", "fisheye", 0, AV_OPT_TYPE_CONST, {.i64=FISHEYE}, 0, 0, FLAGS, .unit = "in" },
{ "pannini", "pannini", 0, AV_OPT_TYPE_CONST, {.i64=PANNINI}, 0, 0, FLAGS, .unit = "in" },
{"cylindrical", "cylindrical", 0, AV_OPT_TYPE_CONST, {.i64=CYLINDRICAL}, 0, 0, FLAGS, .unit = "in" },
{"tetrahedron", "tetrahedron", 0, AV_OPT_TYPE_CONST, {.i64=TETRAHEDRON}, 0, 0, FLAGS, .unit = "in" },
{"barrelsplit", "barrel split facebook's 360 format", 0, AV_OPT_TYPE_CONST, {.i64=BARREL_SPLIT}, 0, 0, FLAGS, .unit = "in" },
{ "tsp", "truncated square pyramid", 0, AV_OPT_TYPE_CONST, {.i64=TSPYRAMID}, 0, 0, FLAGS, .unit = "in" },
{ "hequirect", "half equirectangular", 0, AV_OPT_TYPE_CONST, {.i64=HEQUIRECTANGULAR},0, 0, FLAGS, .unit = "in" },
{ "he", "half equirectangular", 0, AV_OPT_TYPE_CONST, {.i64=HEQUIRECTANGULAR},0, 0, FLAGS, .unit = "in" },
{ "equisolid", "equisolid", 0, AV_OPT_TYPE_CONST, {.i64=EQUISOLID}, 0, 0, FLAGS, .unit = "in" },
{ "og", "orthographic", 0, AV_OPT_TYPE_CONST, {.i64=ORTHOGRAPHIC}, 0, 0, FLAGS, .unit = "in" },
{"octahedron", "octahedron", 0, AV_OPT_TYPE_CONST, {.i64=OCTAHEDRON}, 0, 0, FLAGS, .unit = "in" },
{"cylindricalea", "cylindrical equal area", 0, AV_OPT_TYPE_CONST, {.i64=CYLINDRICALEA}, 0, 0, FLAGS, .unit = "in" },
{ "output", "set output projection", OFFSET(out), AV_OPT_TYPE_INT, {.i64=CUBEMAP_3_2}, 0, NB_PROJECTIONS-1, FLAGS, .unit = "out" },
{ "e", "equirectangular", 0, AV_OPT_TYPE_CONST, {.i64=EQUIRECTANGULAR}, 0, 0, FLAGS, .unit = "out" },
{ "equirect", "equirectangular", 0, AV_OPT_TYPE_CONST, {.i64=EQUIRECTANGULAR}, 0, 0, FLAGS, .unit = "out" },
{ "c3x2", "cubemap 3x2", 0, AV_OPT_TYPE_CONST, {.i64=CUBEMAP_3_2}, 0, 0, FLAGS, .unit = "out" },
{ "c6x1", "cubemap 6x1", 0, AV_OPT_TYPE_CONST, {.i64=CUBEMAP_6_1}, 0, 0, FLAGS, .unit = "out" },
{ "eac", "equi-angular cubemap", 0, AV_OPT_TYPE_CONST, {.i64=EQUIANGULAR}, 0, 0, FLAGS, .unit = "out" },
{ "dfisheye", "dual fisheye", 0, AV_OPT_TYPE_CONST, {.i64=DUAL_FISHEYE}, 0, 0, FLAGS, .unit = "out" },
{ "flat", "regular video", 0, AV_OPT_TYPE_CONST, {.i64=FLAT}, 0, 0, FLAGS, .unit = "out" },
{"rectilinear", "regular video", 0, AV_OPT_TYPE_CONST, {.i64=FLAT}, 0, 0, FLAGS, .unit = "out" },
{ "gnomonic", "regular video", 0, AV_OPT_TYPE_CONST, {.i64=FLAT}, 0, 0, FLAGS, .unit = "out" },
{ "barrel", "barrel facebook's 360 format", 0, AV_OPT_TYPE_CONST, {.i64=BARREL}, 0, 0, FLAGS, .unit = "out" },
{ "fb", "barrel facebook's 360 format", 0, AV_OPT_TYPE_CONST, {.i64=BARREL}, 0, 0, FLAGS, .unit = "out" },
{ "c1x6", "cubemap 1x6", 0, AV_OPT_TYPE_CONST, {.i64=CUBEMAP_1_6}, 0, 0, FLAGS, .unit = "out" },
{ "sg", "stereographic", 0, AV_OPT_TYPE_CONST, {.i64=STEREOGRAPHIC}, 0, 0, FLAGS, .unit = "out" },
{ "mercator", "mercator", 0, AV_OPT_TYPE_CONST, {.i64=MERCATOR}, 0, 0, FLAGS, .unit = "out" },
{ "ball", "ball", 0, AV_OPT_TYPE_CONST, {.i64=BALL}, 0, 0, FLAGS, .unit = "out" },
{ "hammer", "hammer", 0, AV_OPT_TYPE_CONST, {.i64=HAMMER}, 0, 0, FLAGS, .unit = "out" },
{"sinusoidal", "sinusoidal", 0, AV_OPT_TYPE_CONST, {.i64=SINUSOIDAL}, 0, 0, FLAGS, .unit = "out" },
{ "fisheye", "fisheye", 0, AV_OPT_TYPE_CONST, {.i64=FISHEYE}, 0, 0, FLAGS, .unit = "out" },
{ "pannini", "pannini", 0, AV_OPT_TYPE_CONST, {.i64=PANNINI}, 0, 0, FLAGS, .unit = "out" },
{"cylindrical", "cylindrical", 0, AV_OPT_TYPE_CONST, {.i64=CYLINDRICAL}, 0, 0, FLAGS, .unit = "out" },
{"perspective", "perspective", 0, AV_OPT_TYPE_CONST, {.i64=PERSPECTIVE}, 0, 0, FLAGS, .unit = "out" },
{"tetrahedron", "tetrahedron", 0, AV_OPT_TYPE_CONST, {.i64=TETRAHEDRON}, 0, 0, FLAGS, .unit = "out" },
{"barrelsplit", "barrel split facebook's 360 format", 0, AV_OPT_TYPE_CONST, {.i64=BARREL_SPLIT}, 0, 0, FLAGS, .unit = "out" },
{ "tsp", "truncated square pyramid", 0, AV_OPT_TYPE_CONST, {.i64=TSPYRAMID}, 0, 0, FLAGS, .unit = "out" },
{ "hequirect", "half equirectangular", 0, AV_OPT_TYPE_CONST, {.i64=HEQUIRECTANGULAR},0, 0, FLAGS, .unit = "out" },
{ "he", "half equirectangular", 0, AV_OPT_TYPE_CONST, {.i64=HEQUIRECTANGULAR},0, 0, FLAGS, .unit = "out" },
{ "equisolid", "equisolid", 0, AV_OPT_TYPE_CONST, {.i64=EQUISOLID}, 0, 0, FLAGS, .unit = "out" },
{ "og", "orthographic", 0, AV_OPT_TYPE_CONST, {.i64=ORTHOGRAPHIC}, 0, 0, FLAGS, .unit = "out" },
{"octahedron", "octahedron", 0, AV_OPT_TYPE_CONST, {.i64=OCTAHEDRON}, 0, 0, FLAGS, .unit = "out" },
{"cylindricalea", "cylindrical equal area", 0, AV_OPT_TYPE_CONST, {.i64=CYLINDRICALEA}, 0, 0, FLAGS, .unit = "out" },
{ "interp", "set interpolation method", OFFSET(interp), AV_OPT_TYPE_INT, {.i64=BILINEAR}, 0, NB_INTERP_METHODS-1, FLAGS, .unit = "interp" },
{ "near", "nearest neighbour", 0, AV_OPT_TYPE_CONST, {.i64=NEAREST}, 0, 0, FLAGS, .unit = "interp" },
{ "nearest", "nearest neighbour", 0, AV_OPT_TYPE_CONST, {.i64=NEAREST}, 0, 0, FLAGS, .unit = "interp" },
{ "line", "bilinear interpolation", 0, AV_OPT_TYPE_CONST, {.i64=BILINEAR}, 0, 0, FLAGS, .unit = "interp" },
{ "linear", "bilinear interpolation", 0, AV_OPT_TYPE_CONST, {.i64=BILINEAR}, 0, 0, FLAGS, .unit = "interp" },
{ "lagrange9", "lagrange9 interpolation", 0, AV_OPT_TYPE_CONST, {.i64=LAGRANGE9}, 0, 0, FLAGS, .unit = "interp" },
{ "cube", "bicubic interpolation", 0, AV_OPT_TYPE_CONST, {.i64=BICUBIC}, 0, 0, FLAGS, .unit = "interp" },
{ "cubic", "bicubic interpolation", 0, AV_OPT_TYPE_CONST, {.i64=BICUBIC}, 0, 0, FLAGS, .unit = "interp" },
{ "lanc", "lanczos interpolation", 0, AV_OPT_TYPE_CONST, {.i64=LANCZOS}, 0, 0, FLAGS, .unit = "interp" },
{ "lanczos", "lanczos interpolation", 0, AV_OPT_TYPE_CONST, {.i64=LANCZOS}, 0, 0, FLAGS, .unit = "interp" },
{ "sp16", "spline16 interpolation", 0, AV_OPT_TYPE_CONST, {.i64=SPLINE16}, 0, 0, FLAGS, .unit = "interp" },
{ "spline16", "spline16 interpolation", 0, AV_OPT_TYPE_CONST, {.i64=SPLINE16}, 0, 0, FLAGS, .unit = "interp" },
{ "gauss", "gaussian interpolation", 0, AV_OPT_TYPE_CONST, {.i64=GAUSSIAN}, 0, 0, FLAGS, .unit = "interp" },
{ "gaussian", "gaussian interpolation", 0, AV_OPT_TYPE_CONST, {.i64=GAUSSIAN}, 0, 0, FLAGS, .unit = "interp" },
{ "mitchell", "mitchell interpolation", 0, AV_OPT_TYPE_CONST, {.i64=MITCHELL}, 0, 0, FLAGS, .unit = "interp" },
{ "w", "output width", OFFSET(width), AV_OPT_TYPE_INT, {.i64=0}, 0, INT16_MAX, FLAGS, .unit = "w"},
{ "h", "output height", OFFSET(height), AV_OPT_TYPE_INT, {.i64=0}, 0, INT16_MAX, FLAGS, .unit = "h"},
{ "in_stereo", "input stereo format", OFFSET(in_stereo), AV_OPT_TYPE_INT, {.i64=STEREO_2D}, 0, NB_STEREO_FMTS-1, FLAGS, .unit = "stereo" },
{"out_stereo", "output stereo format", OFFSET(out_stereo), AV_OPT_TYPE_INT, {.i64=STEREO_2D}, 0, NB_STEREO_FMTS-1, FLAGS, .unit = "stereo" },
{ "2d", "2d mono", 0, AV_OPT_TYPE_CONST, {.i64=STEREO_2D}, 0, 0, FLAGS, .unit = "stereo" },
{ "sbs", "side by side", 0, AV_OPT_TYPE_CONST, {.i64=STEREO_SBS}, 0, 0, FLAGS, .unit = "stereo" },
{ "tb", "top bottom", 0, AV_OPT_TYPE_CONST, {.i64=STEREO_TB}, 0, 0, FLAGS, .unit = "stereo" },
{ "in_forder", "input cubemap face order", OFFSET(in_forder), AV_OPT_TYPE_STRING, {.str="rludfb"}, 0, NB_DIRECTIONS-1, FLAGS, .unit = "in_forder"},
{"out_forder", "output cubemap face order", OFFSET(out_forder), AV_OPT_TYPE_STRING, {.str="rludfb"}, 0, NB_DIRECTIONS-1, FLAGS, .unit = "out_forder"},
{ "in_frot", "input cubemap face rotation", OFFSET(in_frot), AV_OPT_TYPE_STRING, {.str="000000"}, 0, NB_DIRECTIONS-1, FLAGS, .unit = "in_frot"},
{ "out_frot", "output cubemap face rotation",OFFSET(out_frot), AV_OPT_TYPE_STRING, {.str="000000"}, 0, NB_DIRECTIONS-1, FLAGS, .unit = "out_frot"},
{ "in_pad", "percent input cubemap pads", OFFSET(in_pad), AV_OPT_TYPE_FLOAT, {.dbl=0.f}, 0.f, 0.1,TFLAGS, .unit = "in_pad"},
{ "out_pad", "percent output cubemap pads", OFFSET(out_pad), AV_OPT_TYPE_FLOAT, {.dbl=0.f}, 0.f, 0.1,TFLAGS, .unit = "out_pad"},
{ "fin_pad", "fixed input cubemap pads", OFFSET(fin_pad), AV_OPT_TYPE_INT, {.i64=0}, 0, 100,TFLAGS, .unit = "fin_pad"},
{ "fout_pad", "fixed output cubemap pads", OFFSET(fout_pad), AV_OPT_TYPE_INT, {.i64=0}, 0, 100,TFLAGS, .unit = "fout_pad"},
{ "yaw", "yaw rotation", OFFSET(yaw), AV_OPT_TYPE_FLOAT, {.dbl=0.f}, -180.f, 180.f,TFLAGS, .unit = "yaw"},
{ "pitch", "pitch rotation", OFFSET(pitch), AV_OPT_TYPE_FLOAT, {.dbl=0.f}, -180.f, 180.f,TFLAGS, .unit = "pitch"},
{ "roll", "roll rotation", OFFSET(roll), AV_OPT_TYPE_FLOAT, {.dbl=0.f}, -180.f, 180.f,TFLAGS, .unit = "roll"},
{ "rorder", "rotation order", OFFSET(rorder), AV_OPT_TYPE_STRING, {.str="ypr"}, 0, 0,TFLAGS, .unit = "rorder"},
{ "h_fov", "output horizontal field of view",OFFSET(h_fov), AV_OPT_TYPE_FLOAT, {.dbl=0.f}, 0.f, 360.f,TFLAGS, .unit = "h_fov"},
{ "v_fov", "output vertical field of view", OFFSET(v_fov), AV_OPT_TYPE_FLOAT, {.dbl=0.f}, 0.f, 360.f,TFLAGS, .unit = "v_fov"},
{ "d_fov", "output diagonal field of view", OFFSET(d_fov), AV_OPT_TYPE_FLOAT, {.dbl=0.f}, 0.f, 360.f,TFLAGS, .unit = "d_fov"},
{ "h_flip", "flip out video horizontally", OFFSET(h_flip), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1,TFLAGS, .unit = "h_flip"},
{ "v_flip", "flip out video vertically", OFFSET(v_flip), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1,TFLAGS, .unit = "v_flip"},
{ "d_flip", "flip out video indepth", OFFSET(d_flip), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1,TFLAGS, .unit = "d_flip"},
{ "ih_flip", "flip in video horizontally", OFFSET(ih_flip), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1,TFLAGS, .unit = "ih_flip"},
{ "iv_flip", "flip in video vertically", OFFSET(iv_flip), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1,TFLAGS, .unit = "iv_flip"},
{ "in_trans", "transpose video input", OFFSET(in_transpose), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS, .unit = "in_transpose"},
{ "out_trans", "transpose video output", OFFSET(out_transpose), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS, .unit = "out_transpose"},
{ "ih_fov", "input horizontal field of view",OFFSET(ih_fov), AV_OPT_TYPE_FLOAT, {.dbl=0.f}, 0.f, 360.f,TFLAGS, .unit = "ih_fov"},
{ "iv_fov", "input vertical field of view", OFFSET(iv_fov), AV_OPT_TYPE_FLOAT, {.dbl=0.f}, 0.f, 360.f,TFLAGS, .unit = "iv_fov"},
{ "id_fov", "input diagonal field of view", OFFSET(id_fov), AV_OPT_TYPE_FLOAT, {.dbl=0.f}, 0.f, 360.f,TFLAGS, .unit = "id_fov"},
{ "h_offset", "output horizontal off-axis offset",OFFSET(h_offset), AV_OPT_TYPE_FLOAT,{.dbl=0.f}, -1.f, 1.f,TFLAGS, .unit = "h_offset"},
{ "v_offset", "output vertical off-axis offset", OFFSET(v_offset), AV_OPT_TYPE_FLOAT,{.dbl=0.f}, -1.f, 1.f,TFLAGS, .unit = "v_offset"},
{"alpha_mask", "build mask in alpha plane", OFFSET(alpha), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS, .unit = "alpha"},
{ "reset_rot", "reset rotation", OFFSET(reset_rot), AV_OPT_TYPE_BOOL, {.i64=0}, -1, 1,TFLAGS, .unit = "reset_rot"},
{ NULL }
};
AVFILTER_DEFINE_CLASS(v360);
static int query_formats(AVFilterContext *ctx)
{
V360Context *s = ctx->priv;
static const enum AVPixelFormat pix_fmts[] = {
// YUVA444
AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA444P9,
AV_PIX_FMT_YUVA444P10, AV_PIX_FMT_YUVA444P12,
AV_PIX_FMT_YUVA444P16,
// YUVA422
AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA422P9,
AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA422P12,
AV_PIX_FMT_YUVA422P16,
// YUVA420
AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA420P9,
AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA420P16,
// YUVJ
AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,
AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
AV_PIX_FMT_YUVJ411P,
// YUV444
AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV444P9,
AV_PIX_FMT_YUV444P10, AV_PIX_FMT_YUV444P12,
AV_PIX_FMT_YUV444P14, AV_PIX_FMT_YUV444P16,
// YUV440
AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV440P10,
AV_PIX_FMT_YUV440P12,
// YUV422
AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV422P9,
AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV422P12,
AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV422P16,
// YUV420
AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV420P9,
AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV420P12,
AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV420P16,
// YUV411
AV_PIX_FMT_YUV411P,
// YUV410
AV_PIX_FMT_YUV410P,
// GBR
AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRP9,
AV_PIX_FMT_GBRP10, AV_PIX_FMT_GBRP12,
AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,
// GBRA
AV_PIX_FMT_GBRAP, AV_PIX_FMT_GBRAP10,
AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRAP16,
// GRAY
AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY9,
AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12,
AV_PIX_FMT_GRAY14, AV_PIX_FMT_GRAY16,
AV_PIX_FMT_NONE
};
static const enum AVPixelFormat alpha_pix_fmts[] = {
AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA444P9,
AV_PIX_FMT_YUVA444P10, AV_PIX_FMT_YUVA444P12,
AV_PIX_FMT_YUVA444P16,
AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA422P9,
AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA422P12,
AV_PIX_FMT_YUVA422P16,
AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA420P9,
AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA420P16,
AV_PIX_FMT_GBRAP, AV_PIX_FMT_GBRAP10,
AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRAP16,
AV_PIX_FMT_NONE
};
return ff_set_common_formats_from_list(ctx, s->alpha ? alpha_pix_fmts : pix_fmts);
}
#define DEFINE_REMAP1_LINE(bits, div) \
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]]; \
}
DEFINE_REMAP1_LINE( 8, 1)
DEFINE_REMAP1_LINE(16, 2)
/**
* Generate remapping function with a given window size and pixel depth.
*
* @param ws size of interpolation window
* @param bits number of bits per pixel
*/
#define DEFINE_REMAP(ws, bits) \
static int remap##ws##_##bits##bit_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs) \
{ \
ThreadData *td = arg; \
const V360Context *s = ctx->priv; \
const SliceXYRemap *r = &s->slice_remap[jobnr]; \
const AVFrame *in = td->in; \
AVFrame *out = td->out; \
\
for (int stereo = 0; stereo < 1 + s->out_stereo > STEREO_2D; stereo++) { \
for (int plane = 0; plane < s->nb_planes; plane++) { \
const unsigned map = s->map[plane]; \
const int in_linesize = in->linesize[plane]; \
const int out_linesize = out->linesize[plane]; \
const int uv_linesize = s->uv_linesize[plane]; \
const int in_offset_w = stereo ? s->in_offset_w[plane] : 0; \
const int in_offset_h = stereo ? s->in_offset_h[plane] : 0; \
const int out_offset_w = stereo ? s->out_offset_w[plane] : 0; \
const int out_offset_h = stereo ? s->out_offset_h[plane] : 0; \
const uint8_t *const src = in->data[plane] + \
in_offset_h * in_linesize + in_offset_w * (bits >> 3); \
uint8_t *dst = out->data[plane] + out_offset_h * out_linesize + out_offset_w * (bits >> 3); \
const uint8_t *mask = plane == 3 ? r->mask : NULL; \
const int width = s->pr_width[plane]; \
const int height = s->pr_height[plane]; \
\
const int slice_start = (height * jobnr ) / nb_jobs; \
const int slice_end = (height * (jobnr + 1)) / nb_jobs; \
\
for (int y = slice_start; y < slice_end && !mask; y++) { \
const int16_t *const u = r->u[map] + (y - slice_start) * uv_linesize * ws * ws; \
const int16_t *const v = r->v[map] + (y - slice_start) * uv_linesize * ws * ws; \
const int16_t *const ker = r->ker[map] + (y - slice_start) * uv_linesize * ws * ws; \
\
s->remap_line(dst + y * out_linesize, width, src, in_linesize, u, v, ker); \
} \
\
for (int y = slice_start; y < slice_end && mask; y++) { \
memcpy(dst + y * out_linesize, mask + \
(y - slice_start) * width * (bits >> 3), width * (bits >> 3)); \
} \
} \
} \
\
return 0; \
}
DEFINE_REMAP(1, 8)
DEFINE_REMAP(2, 8)
DEFINE_REMAP(3, 8)
DEFINE_REMAP(4, 8)
DEFINE_REMAP(1, 16)
DEFINE_REMAP(2, 16)
DEFINE_REMAP(3, 16)
DEFINE_REMAP(4, 16)
#define DEFINE_REMAP_LINE(ws, bits, div) \
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); \
} \
}
DEFINE_REMAP_LINE(2, 8, 1)
DEFINE_REMAP_LINE(3, 8, 1)
DEFINE_REMAP_LINE(4, 8, 1)
DEFINE_REMAP_LINE(2, 16, 2)
DEFINE_REMAP_LINE(3, 16, 2)
DEFINE_REMAP_LINE(4, 16, 2)
void ff_v360_init(V360Context *s, int depth)
{
switch (s->interp) {
case NEAREST:
s->remap_line = depth <= 8 ? remap1_8bit_line_c : remap1_16bit_line_c;
break;
case BILINEAR:
s->remap_line = depth <= 8 ? remap2_8bit_line_c : remap2_16bit_line_c;
break;
case LAGRANGE9:
s->remap_line = depth <= 8 ? remap3_8bit_line_c : remap3_16bit_line_c;
break;
case BICUBIC:
case LANCZOS:
case SPLINE16:
case GAUSSIAN:
case MITCHELL:
s->remap_line = depth <= 8 ? remap4_8bit_line_c : remap4_16bit_line_c;
break;
}
#if ARCH_X86
ff_v360_init_x86(s, depth);
#endif
}
/**
* Save nearest pixel coordinates for remapping.
*
* @param du horizontal relative coordinate
* @param dv vertical relative coordinate
* @param rmap calculated 4x4 window
* @param u u remap data
* @param v v remap data
* @param ker ker remap data
*/
static void nearest_kernel(float du, float dv, const XYRemap *rmap,
int16_t *u, int16_t *v, int16_t *ker)
{
const int i = lrintf(dv) + 1;
const int j = lrintf(du) + 1;
u[0] = rmap->u[i][j];
v[0] = rmap->v[i][j];
}
/**
* Calculate kernel for bilinear interpolation.
*
* @param du horizontal relative coordinate
* @param dv vertical relative coordinate
* @param rmap calculated 4x4 window
* @param u u remap data
* @param v v remap data
* @param ker ker remap data
*/
static void bilinear_kernel(float du, float dv, const XYRemap *rmap,
int16_t *u, int16_t *v, int16_t *ker)
{
for (int i = 0; i < 2; i++) {
for (int j = 0; j < 2; j++) {
u[i * 2 + j] = rmap->u[i + 1][j + 1];
v[i * 2 + j] = rmap->v[i + 1][j + 1];
}
}
ker[0] = lrintf((1.f - du) * (1.f - dv) * 16385.f);
ker[1] = lrintf( du * (1.f - dv) * 16385.f);
ker[2] = lrintf((1.f - du) * dv * 16385.f);
ker[3] = lrintf( du * dv * 16385.f);
}
/**
* Calculate 1-dimensional lagrange coefficients.
*
* @param t relative coordinate
* @param coeffs coefficients
*/
static inline void calculate_lagrange_coeffs(float t, float *coeffs)
{
coeffs[0] = (t - 1.f) * (t - 2.f) * 0.5f;
coeffs[1] = -t * (t - 2.f);
coeffs[2] = t * (t - 1.f) * 0.5f;
}
/**
* Calculate kernel for lagrange interpolation.
*
* @param du horizontal relative coordinate
* @param dv vertical relative coordinate
* @param rmap calculated 4x4 window
* @param u u remap data
* @param v v remap data
* @param ker ker remap data
*/
static void lagrange_kernel(float du, float dv, const XYRemap *rmap,
int16_t *u, int16_t *v, int16_t *ker)
{
float du_coeffs[3];
float dv_coeffs[3];
calculate_lagrange_coeffs(du, du_coeffs);
calculate_lagrange_coeffs(dv, dv_coeffs);
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 3; j++) {
u[i * 3 + j] = rmap->u[i + 1][j + 1];
v[i * 3 + j] = rmap->v[i + 1][j + 1];
ker[i * 3 + j] = lrintf(du_coeffs[j] * dv_coeffs[i] * 16385.f);
}
}
}
/**
* Calculate 1-dimensional cubic coefficients.
*
* @param t relative coordinate
* @param coeffs coefficients
*/
static inline void calculate_bicubic_coeffs(float t, float *coeffs)
{
const float tt = t * t;
const float ttt = t * t * t;
coeffs[0] = - t / 3.f + tt / 2.f - ttt / 6.f;
coeffs[1] = 1.f - t / 2.f - tt + ttt / 2.f;
coeffs[2] = t + tt / 2.f - ttt / 2.f;
coeffs[3] = - t / 6.f + ttt / 6.f;
}
/**
* Calculate kernel for bicubic interpolation.
*
* @param du horizontal relative coordinate
* @param dv vertical relative coordinate
* @param rmap calculated 4x4 window
* @param u u remap data
* @param v v remap data
* @param ker ker remap data
*/
static void bicubic_kernel(float du, float dv, const XYRemap *rmap,
int16_t *u, int16_t *v, int16_t *ker)
{
float du_coeffs[4];
float dv_coeffs[4];
calculate_bicubic_coeffs(du, du_coeffs);
calculate_bicubic_coeffs(dv, dv_coeffs);
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
u[i * 4 + j] = rmap->u[i][j];
v[i * 4 + j] = rmap->v[i][j];
ker[i * 4 + j] = lrintf(du_coeffs[j] * dv_coeffs[i] * 16385.f);
}
}
}
/**
* Calculate 1-dimensional lanczos coefficients.
*
* @param t relative coordinate
* @param coeffs coefficients
*/
static inline void calculate_lanczos_coeffs(float t, float *coeffs)
{
float sum = 0.f;
for (int i = 0; i < 4; i++) {
const float x = M_PI * (t - i + 1);
if (x == 0.f) {
coeffs[i] = 1.f;
} else {
coeffs[i] = sinf(x) * sinf(x / 2.f) / (x * x / 2.f);
}
sum += coeffs[i];
}
for (int i = 0; i < 4; i++) {
coeffs[i] /= sum;
}
}
/**
* Calculate kernel for lanczos interpolation.
*
* @param du horizontal relative coordinate
* @param dv vertical relative coordinate
* @param rmap calculated 4x4 window
* @param u u remap data
* @param v v remap data
* @param ker ker remap data
*/
static void lanczos_kernel(float du, float dv, const XYRemap *rmap,
int16_t *u, int16_t *v, int16_t *ker)
{
float du_coeffs[4];
float dv_coeffs[4];
calculate_lanczos_coeffs(du, du_coeffs);
calculate_lanczos_coeffs(dv, dv_coeffs);
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
u[i * 4 + j] = rmap->u[i][j];
v[i * 4 + j] = rmap->v[i][j];
ker[i * 4 + j] = lrintf(du_coeffs[j] * dv_coeffs[i] * 16385.f);
}
}
}
/**
* Calculate 1-dimensional spline16 coefficients.
*
* @param t relative coordinate
* @param coeffs coefficients
*/
static void calculate_spline16_coeffs(float t, float *coeffs)
{
coeffs[0] = ((-1.f / 3.f * t + 0.8f) * t - 7.f / 15.f) * t;
coeffs[1] = ((t - 9.f / 5.f) * t - 0.2f) * t + 1.f;
coeffs[2] = ((6.f / 5.f - t) * t + 0.8f) * t;
coeffs[3] = ((1.f / 3.f * t - 0.2f) * t - 2.f / 15.f) * t;
}
/**
* Calculate kernel for spline16 interpolation.
*
* @param du horizontal relative coordinate
* @param dv vertical relative coordinate
* @param rmap calculated 4x4 window
* @param u u remap data
* @param v v remap data
* @param ker ker remap data
*/
static void spline16_kernel(float du, float dv, const XYRemap *rmap,
int16_t *u, int16_t *v, int16_t *ker)
{
float du_coeffs[4];
float dv_coeffs[4];
calculate_spline16_coeffs(du, du_coeffs);
calculate_spline16_coeffs(dv, dv_coeffs);
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
u[i * 4 + j] = rmap->u[i][j];
v[i * 4 + j] = rmap->v[i][j];
ker[i * 4 + j] = lrintf(du_coeffs[j] * dv_coeffs[i] * 16385.f);
}
}
}
/**
* Calculate 1-dimensional gaussian coefficients.
*
* @param t relative coordinate
* @param coeffs coefficients
*/
static void calculate_gaussian_coeffs(float t, float *coeffs)
{
float sum = 0.f;
for (int i = 0; i < 4; i++) {
const float x = t - (i - 1);
if (x == 0.f) {
coeffs[i] = 1.f;
} else {
coeffs[i] = expf(-2.f * x * x) * expf(-x * x / 2.f);
}
sum += coeffs[i];
}
for (int i = 0; i < 4; i++) {
coeffs[i] /= sum;
}
}
/**
* Calculate kernel for gaussian interpolation.
*
* @param du horizontal relative coordinate
* @param dv vertical relative coordinate
* @param rmap calculated 4x4 window
* @param u u remap data
* @param v v remap data
* @param ker ker remap data
*/
static void gaussian_kernel(float du, float dv, const XYRemap *rmap,
int16_t *u, int16_t *v, int16_t *ker)
{
float du_coeffs[4];
float dv_coeffs[4];
calculate_gaussian_coeffs(du, du_coeffs);
calculate_gaussian_coeffs(dv, dv_coeffs);
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
u[i * 4 + j] = rmap->u[i][j];
v[i * 4 + j] = rmap->v[i][j];
ker[i * 4 + j] = lrintf(du_coeffs[j] * dv_coeffs[i] * 16385.f);
}
}
}
/**
* Calculate 1-dimensional cubic_bc_spline coefficients.
*
* @param t relative coordinate
* @param coeffs coefficients
*/
static void calculate_cubic_bc_coeffs(float t, float *coeffs,
float b, float c)
{
float sum = 0.f;
float p0 = (6.f - 2.f * b) / 6.f,
p2 = (-18.f + 12.f * b + 6.f * c) / 6.f,
p3 = (12.f - 9.f * b - 6.f * c) / 6.f,
q0 = (8.f * b + 24.f * c) / 6.f,
q1 = (-12.f * b - 48.f * c) / 6.f,
q2 = (6.f * b + 30.f * c) / 6.f,
q3 = (-b - 6.f * c) / 6.f;
for (int i = 0; i < 4; i++) {
const float x = fabsf(t - i + 1.f);
if (x < 1.f) {
coeffs[i] = (p0 + x * x * (p2 + x * p3)) *
(p0 + x * x * (p2 + x * p3 / 2.f) / 4.f);
} else if (x < 2.f) {
coeffs[i] = (q0 + x * (q1 + x * (q2 + x * q3))) *
(q0 + x * (q1 + x * (q2 + x / 2.f * q3) / 2.f) / 2.f);
} else {
coeffs[i] = 0.f;
}
sum += coeffs[i];
}
for (int i = 0; i < 4; i++) {
coeffs[i] /= sum;
}
}
/**
* Calculate kernel for mitchell interpolation.
*
* @param du horizontal relative coordinate
* @param dv vertical relative coordinate
* @param rmap calculated 4x4 window
* @param u u remap data
* @param v v remap data
* @param ker ker remap data
*/
static void mitchell_kernel(float du, float dv, const XYRemap *rmap,
int16_t *u, int16_t *v, int16_t *ker)
{
float du_coeffs[4];
float dv_coeffs[4];
calculate_cubic_bc_coeffs(du, du_coeffs, 1.f / 3.f, 1.f / 3.f);
calculate_cubic_bc_coeffs(dv, dv_coeffs, 1.f / 3.f, 1.f / 3.f);
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
u[i * 4 + j] = rmap->u[i][j];
v[i * 4 + j] = rmap->v[i][j];
ker[i * 4 + j] = lrintf(du_coeffs[j] * dv_coeffs[i] * 16385.f);
}
}
}
/**
* Modulo operation with only positive remainders.
*
* @param a dividend
* @param b divisor
*
* @return positive remainder of (a / b)
*/
static inline int mod(int a, int b)
{
const int res = a % b;
if (res < 0) {
return res + b;
} else {
return res;
}
}
/**
* Reflect y operation.
*
* @param y input vertical position
* @param h input height
*/
static inline int reflecty(int y, int h)
{
if (y < 0) {
y = -y;
} else if (y >= h) {
y = 2 * h - 1 - y;
}
return av_clip(y, 0, h - 1);
}
/**
* Reflect x operation for equirect.
*
* @param x input horizontal position
* @param y input vertical position
* @param w input width
* @param h input height
*/
static inline int ereflectx(int x, int y, int w, int h)
{
if (y < 0 || y >= h)
x += w / 2;
return mod(x, w);
}
/**
* Reflect x operation.
*
* @param x input horizontal position
* @param y input vertical position
* @param w input width
* @param h input height
*/
static inline int reflectx(int x, int y, int w, int h)
{
if (y < 0 || y >= h)
return w - 1 - x;
return mod(x, w);
}
/**
* Convert char to corresponding direction.
* Used for cubemap options.
*/
static int get_direction(char c)
{
switch (c) {
case 'r':
return RIGHT;
case 'l':
return LEFT;
case 'u':
return UP;
case 'd':
return DOWN;
case 'f':
return FRONT;
case 'b':
return BACK;
default:
return -1;
}
}
/**
* Convert char to corresponding rotation angle.
* Used for cubemap options.
*/
static int get_rotation(char c)
{
switch (c) {
case '0':
return ROT_0;
case '1':
return ROT_90;
case '2':
return ROT_180;
case '3':
return ROT_270;
default:
return -1;
}
}
/**
* Convert char to corresponding rotation order.
*/
static int get_rorder(char c)
{
switch (c) {
case 'Y':
case 'y':
return YAW;
case 'P':
case 'p':
return PITCH;
case 'R':
case 'r':
return ROLL;
default:
return -1;
}
}
/**
* Prepare data for processing cubemap input format.
*
* @param ctx filter context
*
* @return error code
*/
static int prepare_cube_in(AVFilterContext *ctx)
{
V360Context *s = ctx->priv;
for (int face = 0; face < NB_FACES; face++) {
const char c = s->in_forder[face];
int direction;
if (c == '\0') {
av_log(ctx, AV_LOG_ERROR,
"Incomplete in_forder option. Direction for all 6 faces should be specified.\n");
return AVERROR(EINVAL);
}
direction = get_direction(c);
if (direction == -1) {
av_log(ctx, AV_LOG_ERROR,
"Incorrect direction symbol '%c' in in_forder option.\n", c);
return AVERROR(EINVAL);
}
s->in_cubemap_face_order[direction] = face;
}
for (int face = 0; face < NB_FACES; face++) {
const char c = s->in_frot[face];
int rotation;
if (c == '\0') {
av_log(ctx, AV_LOG_ERROR,
"Incomplete in_frot option. Rotation for all 6 faces should be specified.\n");
return AVERROR(EINVAL);
}
rotation = get_rotation(c);
if (rotation == -1) {
av_log(ctx, AV_LOG_ERROR,
"Incorrect rotation symbol '%c' in in_frot option.\n", c);
return AVERROR(EINVAL);
}
s->in_cubemap_face_rotation[face] = rotation;
}
return 0;
}
/**
* Prepare data for processing cubemap output format.
*
* @param ctx filter context
*
* @return error code
*/
static int prepare_cube_out(AVFilterContext *ctx)
{
V360Context *s = ctx->priv;
for (int face = 0; face < NB_FACES; face++) {
const char c = s->out_forder[face];
int direction;
if (c == '\0') {
av_log(ctx, AV_LOG_ERROR,
"Incomplete out_forder option. Direction for all 6 faces should be specified.\n");
return AVERROR(EINVAL);
}
direction = get_direction(c);
if (direction == -1) {
av_log(ctx, AV_LOG_ERROR,
"Incorrect direction symbol '%c' in out_forder option.\n", c);
return AVERROR(EINVAL);
}
s->out_cubemap_direction_order[face] = direction;
}
for (int face = 0; face < NB_FACES; face++) {
const char c = s->out_frot[face];
int rotation;
if (c == '\0') {
av_log(ctx, AV_LOG_ERROR,
"Incomplete out_frot option. Rotation for all 6 faces should be specified.\n");
return AVERROR(EINVAL);
}
rotation = get_rotation(c);
if (rotation == -1) {
av_log(ctx, AV_LOG_ERROR,
"Incorrect rotation symbol '%c' in out_frot option.\n", c);
return AVERROR(EINVAL);
}
s->out_cubemap_face_rotation[face] = rotation;
}
return 0;
}
static inline void rotate_cube_face(float *uf, float *vf, int rotation)
{
float tmp;
switch (rotation) {
case ROT_0:
break;
case ROT_90:
tmp = *uf;
*uf = -*vf;
*vf = tmp;
break;
case ROT_180:
*uf = -*uf;
*vf = -*vf;
break;
case ROT_270:
tmp = -*uf;
*uf = *vf;
*vf = tmp;
break;
default:
av_assert0(0);
}
}
static inline void rotate_cube_face_inverse(float *uf, float *vf, int rotation)
{
float tmp;
switch (rotation) {
case ROT_0:
break;
case ROT_90:
tmp = -*uf;
*uf = *vf;
*vf = tmp;
break;
case ROT_180:
*uf = -*uf;
*vf = -*vf;
break;
case ROT_270:
tmp = *uf;
*uf = -*vf;
*vf = tmp;
break;
default:
av_assert0(0);
}
}
/**
* Offset vector.
*
* @param vec vector
*/
static void offset_vector(float *vec, float h_offset, float v_offset)
{
vec[0] += h_offset;
vec[1] += v_offset;
}
/**
* Normalize vector.
*
* @param vec vector
*/
static void normalize_vector(float *vec)
{
const float norm = sqrtf(vec[0] * vec[0] + vec[1] * vec[1] + vec[2] * vec[2]);
vec[0] /= norm;
vec[1] /= norm;
vec[2] /= norm;
}
/**
* Calculate 3D coordinates on sphere for corresponding cubemap position.
* Common operation for every cubemap.
*
* @param s filter private context
* @param uf horizontal cubemap coordinate [0, 1)
* @param vf vertical cubemap coordinate [0, 1)
* @param face face of cubemap
* @param vec coordinates on sphere
* @param scalew scale for uf
* @param scaleh scale for vf
*/
static void cube_to_xyz(const V360Context *s,
float uf, float vf, int face,
float *vec, float scalew, float scaleh)
{
const int direction = s->out_cubemap_direction_order[face];
float l_x, l_y, l_z;
uf /= scalew;
vf /= scaleh;
rotate_cube_face_inverse(&uf, &vf, s->out_cubemap_face_rotation[face]);
switch (direction) {
case RIGHT:
l_x = 1.f;
l_y = vf;
l_z = -uf;
break;
case LEFT:
l_x = -1.f;
l_y = vf;
l_z = uf;
break;
case UP:
l_x = uf;
l_y = -1.f;
l_z = vf;
break;
case DOWN:
l_x = uf;
l_y = 1.f;
l_z = -vf;
break;
case FRONT:
l_x = uf;
l_y = vf;
l_z = 1.f;
break;
case BACK:
l_x = -uf;
l_y = vf;
l_z = -1.f;
break;
default:
av_assert0(0);
}
vec[0] = l_x;
vec[1] = l_y;
vec[2] = l_z;
}
/**
* Calculate cubemap position for corresponding 3D coordinates on sphere.
* Common operation for every cubemap.
*
* @param s filter private context
* @param vec coordinated on sphere
* @param uf horizontal cubemap coordinate [0, 1)
* @param vf vertical cubemap coordinate [0, 1)
* @param direction direction of view
*/
static void xyz_to_cube(const V360Context *s,
const float *vec,
float *uf, float *vf, int *direction)
{
const float phi = atan2f(vec[0], vec[2]);
const float theta = asinf(vec[1]);
float phi_norm, theta_threshold;
int face;
if (phi >= -M_PI_4 && phi < M_PI_4) {
*direction = FRONT;
phi_norm = phi;
} else if (phi >= -(M_PI_2 + M_PI_4) && phi < -M_PI_4) {
*direction = LEFT;
phi_norm = phi + M_PI_2;
} else if (phi >= M_PI_4 && phi < M_PI_2 + M_PI_4) {
*direction = RIGHT;
phi_norm = phi - M_PI_2;
} else {
*direction = BACK;
phi_norm = phi + ((phi > 0.f) ? -M_PI : M_PI);
}
theta_threshold = atanf(cosf(phi_norm));
if (theta > theta_threshold) {
*direction = DOWN;
} else if (theta < -theta_threshold) {
*direction = UP;
}
switch (*direction) {
case RIGHT:
*uf = -vec[2] / vec[0];
*vf = vec[1] / vec[0];
break;
case LEFT:
*uf = -vec[2] / vec[0];
*vf = -vec[1] / vec[0];
break;
case UP:
*uf = -vec[0] / vec[1];
*vf = -vec[2] / vec[1];
break;
case DOWN:
*uf = vec[0] / vec[1];
*vf = -vec[2] / vec[1];
break;
case FRONT:
*uf = vec[0] / vec[2];
*vf = vec[1] / vec[2];
break;
case BACK:
*uf = vec[0] / vec[2];
*vf = -vec[1] / vec[2];
break;
default:
av_assert0(0);
}
face = s->in_cubemap_face_order[*direction];
rotate_cube_face(uf, vf, s->in_cubemap_face_rotation[face]);
}
/**
* Find position on another cube face in case of overflow/underflow.
* Used for calculation of interpolation window.
*
* @param s filter private context
* @param uf horizontal cubemap coordinate
* @param vf vertical cubemap coordinate
* @param direction direction of view
* @param new_uf new horizontal cubemap coordinate
* @param new_vf new vertical cubemap coordinate
* @param face face position on cubemap
*/
static void process_cube_coordinates(const V360Context *s,
float uf, float vf, int direction,
float *new_uf, float *new_vf, int *face)
{
/*
* Cubemap orientation
*
* width
* <------->
* +-------+
* | | U
* | up | h ------->
* +-------+-------+-------+-------+ ^ e |
* | | | | | | i V |
* | left | front | right | back | | g |
* +-------+-------+-------+-------+ v h v
* | | t
* | down |
* +-------+
*/
*face = s->in_cubemap_face_order[direction];
rotate_cube_face_inverse(&uf, &vf, s->in_cubemap_face_rotation[*face]);
if ((uf < -1.f || uf >= 1.f) && (vf < -1.f || vf >= 1.f)) {
// There are no pixels to use in this case
*new_uf = uf;
*new_vf = vf;
} else if (uf < -1.f) {
uf += 2.f;
switch (direction) {
case RIGHT:
direction = FRONT;
*new_uf = uf;
*new_vf = vf;
break;
case LEFT:
direction = BACK;
*new_uf = uf;
*new_vf = vf;
break;
case UP:
direction = LEFT;
*new_uf = vf;
*new_vf = -uf;
break;
case DOWN:
direction = LEFT;
*new_uf = -vf;
*new_vf = uf;
break;
case FRONT:
direction = LEFT;
*new_uf = uf;
*new_vf = vf;
break;
case BACK:
direction = RIGHT;
*new_uf = uf;
*new_vf = vf;
break;
default:
av_assert0(0);
}
} else if (uf >= 1.f) {
uf -= 2.f;
switch (direction) {
case RIGHT:
direction = BACK;
*new_uf = uf;
*new_vf = vf;
break;
case LEFT:
direction = FRONT;
*new_uf = uf;
*new_vf = vf;
break;
case UP:
direction = RIGHT;
*new_uf = -vf;
*new_vf = uf;
break;
case DOWN:
direction = RIGHT;
*new_uf = vf;
*new_vf = -uf;
break;
case FRONT:
direction = RIGHT;
*new_uf = uf;
*new_vf = vf;
break;
case BACK:
direction = LEFT;
*new_uf = uf;
*new_vf = vf;
break;
default:
av_assert0(0);
}
} else if (vf < -1.f) {
vf += 2.f;
switch (direction) {
case RIGHT:
direction = UP;
*new_uf = vf;
*new_vf = -uf;
break;
case LEFT:
direction = UP;
*new_uf = -vf;
*new_vf = uf;
break;
case UP:
direction = BACK;
*new_uf = -uf;
*new_vf = -vf;
break;
case DOWN:
direction = FRONT;
*new_uf = uf;
*new_vf = vf;
break;
case FRONT:
direction = UP;
*new_uf = uf;
*new_vf = vf;
break;
case BACK:
direction = UP;
*new_uf = -uf;
*new_vf = -vf;
break;
default:
av_assert0(0);
}
} else if (vf >= 1.f) {
vf -= 2.f;
switch (direction) {
case RIGHT:
direction = DOWN;
*new_uf = -vf;
*new_vf = uf;
break;
case LEFT:
direction = DOWN;
*new_uf = vf;
*new_vf = -uf;
break;
case UP:
direction = FRONT;
*new_uf = uf;
*new_vf = vf;
break;
case DOWN:
direction = BACK;
*new_uf = -uf;
*new_vf = -vf;
break;
case FRONT:
direction = DOWN;
*new_uf = uf;
*new_vf = vf;
break;
case BACK:
direction = DOWN;
*new_uf = -uf;
*new_vf = -vf;
break;
default:
av_assert0(0);
}
} else {
// Inside cube face
*new_uf = uf;
*new_vf = vf;
}
*face = s->in_cubemap_face_order[direction];
rotate_cube_face(new_uf, new_vf, s->in_cubemap_face_rotation[*face]);
}
static av_always_inline float scale(float x, float s)
{
return (0.5f * x + 0.5f) * (s - 1.f);
}
static av_always_inline float rescale(int x, float s)
{
return (2.f * x + 1.f) / s - 1.f;
}
/**
* Calculate 3D coordinates on sphere for corresponding frame position in cubemap3x2 format.
*
* @param s filter private context
* @param i horizontal position on frame [0, width)
* @param j vertical position on frame [0, height)
* @param width frame width
* @param height frame height
* @param vec coordinates on sphere
*/
static int cube3x2_to_xyz(const V360Context *s,
int i, int j, int width, int height,
float *vec)
{
const float scalew = s->fout_pad > 0 ? 1.f - s->fout_pad / (width / 3.f) : 1.f - s->out_pad;
const float scaleh = s->fout_pad > 0 ? 1.f - s->fout_pad / (height / 2.f) : 1.f - s->out_pad;
const float ew = width / 3.f;
const float eh = height / 2.f;
const int u_face = floorf(i / ew);
const int v_face = floorf(j / eh);
const int face = u_face + 3 * v_face;
const int u_shift = ceilf(ew * u_face);
const int v_shift = ceilf(eh * v_face);
const int ewi = ceilf(ew * (u_face + 1)) - u_shift;
const int ehi = ceilf(eh * (v_face + 1)) - v_shift;
const float uf = rescale(i - u_shift, ewi);
const float vf = rescale(j - v_shift, ehi);
cube_to_xyz(s, uf, vf, face, vec, scalew, scaleh);
return 1;
}
/**
* Calculate frame position in cubemap3x2 format for corresponding 3D coordinates on sphere.
*
* @param s filter private context
* @param vec coordinates on sphere
* @param width frame width
* @param height frame height
* @param us horizontal coordinates for interpolation window
* @param vs vertical coordinates for interpolation window
* @param du horizontal relative coordinate
* @param dv vertical relative coordinate
*/
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)
{
const float scalew = s->fin_pad > 0 ? 1.f - s->fin_pad / (width / 3.f) : 1.f - s->in_pad;
const float scaleh = s->fin_pad > 0 ? 1.f - s->fin_pad / (height / 2.f) : 1.f - s->in_pad;
const float ew = width / 3.f;
const float eh = height / 2.f;
float uf, vf;
int ui, vi;
int ewi, ehi;
int direction, face;
int u_face, v_face;
xyz_to_cube(s, vec, &uf, &vf, &direction);
uf *= scalew;
vf *= scaleh;
face = s->in_cubemap_face_order[direction];
u_face = face % 3;
v_face = face / 3;
ewi = ceilf(ew * (u_face + 1)) - ceilf(ew * u_face);
ehi = ceilf(eh * (v_face + 1)) - ceilf(eh * v_face);
uf = 0.5f * ewi * (uf + 1.f) - 0.5f;
vf = 0.5f * ehi * (vf + 1.f) - 0.5f;
ui = floorf(uf);
vi = floorf(vf);
*du = uf - ui;
*dv = vf - vi;
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
int new_ui = ui + j - 1;
int new_vi = vi + i - 1;
int u_shift, v_shift;
int new_ewi, new_ehi;
if (new_ui >= 0 && new_ui < ewi && new_vi >= 0 && new_vi < ehi) {
face = s->in_cubemap_face_order[direction];
u_face = face % 3;
v_face = face / 3;
u_shift = ceilf(ew * u_face);
v_shift = ceilf(eh * v_face);
} else {
uf = 2.f * new_ui / ewi - 1.f;
vf = 2.f * new_vi / ehi - 1.f;
uf /= scalew;
vf /= scaleh;
process_cube_coordinates(s, uf, vf, direction, &uf, &vf, &face);
uf *= scalew;
vf *= scaleh;
u_face = face % 3;
v_face = face / 3;
u_shift = ceilf(ew * u_face);
v_shift = ceilf(eh * v_face);
new_ewi = ceilf(ew * (u_face + 1)) - u_shift;
new_ehi = ceilf(eh * (v_face + 1)) - v_shift;
new_ui = av_clip(lrintf(0.5f * new_ewi * (uf + 1.f)), 0, new_ewi - 1);
new_vi = av_clip(lrintf(0.5f * new_ehi * (vf + 1.f)), 0, new_ehi - 1);
}
us[i][j] = u_shift + new_ui;
vs[i][j] = v_shift + new_vi;
}
}
return 1;
}
/**
* Calculate 3D coordinates on sphere for corresponding frame position in cubemap1x6 format.
*
* @param s filter private context
* @param i horizontal position on frame [0, width)
* @param j vertical position on frame [0, height)
* @param width frame width
* @param height frame height
* @param vec coordinates on sphere
*/
static int cube1x6_to_xyz(const V360Context *s,
int i, int j, int width, int height,
float *vec)
{
const float scalew = s->fout_pad > 0 ? 1.f - (float)(s->fout_pad) / width : 1.f - s->out_pad;
const float scaleh = s->fout_pad > 0 ? 1.f - s->fout_pad / (height / 6.f) : 1.f - s->out_pad;
const float ew = width;
const float eh = height / 6.f;
const int face = floorf(j / eh);
const int v_shift = ceilf(eh * face);
const int ehi = ceilf(eh * (face + 1)) - v_shift;
const float uf = rescale(i, ew);
const float vf = rescale(j - v_shift, ehi);
cube_to_xyz(s, uf, vf, face, vec, scalew, scaleh);
return 1;
}
/**
* Calculate 3D coordinates on sphere for corresponding frame position in cubemap6x1 format.
*
* @param s filter private context
* @param i horizontal position on frame [0, width)
* @param j vertical position on frame [0, height)
* @param width frame width
* @param height frame height
* @param vec coordinates on sphere
*/
static int cube6x1_to_xyz(const V360Context *s,
int i, int j, int width, int height,
float *vec)
{
const float scalew = s->fout_pad > 0 ? 1.f - s->fout_pad / (width / 6.f) : 1.f - s->out_pad;
const float scaleh = s->fout_pad > 0 ? 1.f - (float)(s->fout_pad) / height : 1.f - s->out_pad;
const float ew = width / 6.f;
const float eh = height;
const int face = floorf(i / ew);
const int u_shift = ceilf(ew * face);
const int ewi = ceilf(ew * (face + 1)) - u_shift;
const float uf = rescale(i - u_shift, ewi);
const float vf = rescale(j, eh);
cube_to_xyz(s, uf, vf, face, vec, scalew, scaleh);
return 1;
}
/**
* Calculate frame position in cubemap1x6 format for corresponding 3D coordinates on sphere.
*
* @param s filter private context
* @param vec coordinates on sphere
* @param width frame width
* @param height frame height
* @param us horizontal coordinates for interpolation window
* @param vs vertical coordinates for interpolation window
* @param du horizontal relative coordinate
* @param dv vertical relative coordinate
*/
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)
{
const float scalew = s->fin_pad > 0 ? 1.f - (float)(s->fin_pad) / width : 1.f - s->in_pad;
const float scaleh = s->fin_pad > 0 ? 1.f - s->fin_pad / (height / 6.f) : 1.f - s->in_pad;
const float eh = height / 6.f;
const int ewi = width;
float uf, vf;
int ui, vi;
int ehi;
int direction, face;
xyz_to_cube(s, vec, &uf, &vf, &direction);
uf *= scalew;
vf *= scaleh;
face = s->in_cubemap_face_order[direction];
ehi = ceilf(eh * (face + 1)) - ceilf(eh * face);
uf = 0.5f * ewi * (uf + 1.f) - 0.5f;
vf = 0.5f * ehi * (vf + 1.f) - 0.5f;
ui = floorf(uf);
vi = floorf(vf);
*du = uf - ui;
*dv = vf - vi;
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
int new_ui = ui + j - 1;
int new_vi = vi + i - 1;
int v_shift;
int new_ehi;
if (new_ui >= 0 && new_ui < ewi && new_vi >= 0 && new_vi < ehi) {
face = s->in_cubemap_face_order[direction];
v_shift = ceilf(eh * face);
} else {
uf = 2.f * new_ui / ewi - 1.f;
vf = 2.f * new_vi / ehi - 1.f;
uf /= scalew;
vf /= scaleh;
process_cube_coordinates(s, uf, vf, direction, &uf, &vf, &face);
uf *= scalew;
vf *= scaleh;
v_shift = ceilf(eh * face);
new_ehi = ceilf(eh * (face + 1)) - v_shift;
new_ui = av_clip(lrintf(0.5f * ewi * (uf + 1.f)), 0, ewi - 1);
new_vi = av_clip(lrintf(0.5f * new_ehi * (vf + 1.f)), 0, new_ehi - 1);
}
us[i][j] = new_ui;
vs[i][j] = v_shift + new_vi;
}
}
return 1;
}
/**
* Calculate frame position in cubemap6x1 format for corresponding 3D coordinates on sphere.
*
* @param s filter private context
* @param vec coordinates on sphere
* @param width frame width
* @param height frame height
* @param us horizontal coordinates for interpolation window
* @param vs vertical coordinates for interpolation window
* @param du horizontal relative coordinate
* @param dv vertical relative coordinate
*/
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)
{
const float scalew = s->fin_pad > 0 ? 1.f - s->fin_pad / (width / 6.f) : 1.f - s->in_pad;
const float scaleh = s->fin_pad > 0 ? 1.f - (float)(s->fin_pad) / height : 1.f - s->in_pad;
const float ew = width / 6.f;
const int ehi = height;
float uf, vf;
int ui, vi;
int ewi;
int direction, face;
xyz_to_cube(s, vec, &uf, &vf, &direction);
uf *= scalew;
vf *= scaleh;
face = s->in_cubemap_face_order[direction];
ewi = ceilf(ew * (face + 1)) - ceilf(ew * face);
uf = 0.5f * ewi * (uf + 1.f) - 0.5f;
vf = 0.5f * ehi * (vf + 1.f) - 0.5f;
ui = floorf(uf);
vi = floorf(vf);
*du = uf - ui;
*dv = vf - vi;
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
int new_ui = ui + j - 1;
int new_vi = vi + i - 1;
int u_shift;
int new_ewi;
if (new_ui >= 0 && new_ui < ewi && new_vi >= 0 && new_vi < ehi) {
face = s->in_cubemap_face_order[direction];
u_shift = ceilf(ew * face);
} else {
uf = 2.f * new_ui / ewi - 1.f;
vf = 2.f * new_vi / ehi - 1.f;
uf /= scalew;
vf /= scaleh;
process_cube_coordinates(s, uf, vf, direction, &uf, &vf, &face);
uf *= scalew;
vf *= scaleh;
u_shift = ceilf(ew * face);
new_ewi = ceilf(ew * (face + 1)) - u_shift;
new_ui = av_clip(lrintf(0.5f * new_ewi * (uf + 1.f)), 0, new_ewi - 1);
new_vi = av_clip(lrintf(0.5f * ehi * (vf + 1.f)), 0, ehi - 1);
}
us[i][j] = u_shift + new_ui;
vs[i][j] = new_vi;
}
}
return 1;
}
/**
* Prepare data for processing equirectangular output format.
*
* @param ctx filter context
*
* @return error code
*/
static int prepare_equirect_out(AVFilterContext *ctx)
{
V360Context *s = ctx->priv;
s->flat_range[0] = s->h_fov * M_PI / 360.f;
s->flat_range[1] = s->v_fov * M_PI / 360.f;
return 0;
}
/**
* Calculate 3D coordinates on sphere for corresponding frame position in equirectangular format.
*
* @param s filter private context
* @param i horizontal position on frame [0, width)
* @param j vertical position on frame [0, height)
* @param width frame width
* @param height frame height
* @param vec coordinates on sphere
*/
static int equirect_to_xyz(const V360Context *s,
int i, int j, int width, int height,
float *vec)
{
const float phi = rescale(i, width) * s->flat_range[0];
const float theta = rescale(j, height) * s->flat_range[1];
const float sin_phi = sinf(phi);
const float cos_phi = cosf(phi);
const float sin_theta = sinf(theta);
const float cos_theta = cosf(theta);
vec[0] = cos_theta * sin_phi;
vec[1] = sin_theta;
vec[2] = cos_theta * cos_phi;
return 1;
}
/**
* Calculate 3D coordinates on sphere for corresponding frame position in half equirectangular format.
*
* @param s filter private context
* @param i horizontal position on frame [0, width)
* @param j vertical position on frame [0, height)
* @param width frame width
* @param height frame height
* @param vec coordinates on sphere
*/
static int hequirect_to_xyz(const V360Context *s,
int i, int j, int width, int height,
float *vec)
{
const float phi = rescale(i, width) * M_PI_2;
const float theta = rescale(j, height) * M_PI_2;
const float sin_phi = sinf(phi);
const float cos_phi = cosf(phi);
const float sin_theta = sinf(theta);
const float cos_theta = cosf(theta);
vec[0] = cos_theta * sin_phi;
vec[1] = sin_theta;
vec[2] = cos_theta * cos_phi;
return 1;
}
/**
* Prepare data for processing stereographic output format.
*
* @param ctx filter context
*
* @return error code
*/
static int prepare_stereographic_out(AVFilterContext *ctx)
{
V360Context *s = ctx->priv;
s->flat_range[0] = tanf(FFMIN(s->h_fov, 359.f) * M_PI / 720.f);
s->flat_range[1] = tanf(FFMIN(s->v_fov, 359.f) * M_PI / 720.f);
return 0;
}
/**
* Calculate 3D coordinates on sphere for corresponding frame position in stereographic format.
*
* @param s filter private context
* @param i horizontal position on frame [0, width)
* @param j vertical position on frame [0, height)
* @param width frame width
* @param height frame height
* @param vec coordinates on sphere
*/
static int stereographic_to_xyz(const V360Context *s,
int i, int j, int width, int height,
float *vec)
{
const float x = rescale(i, width) * s->flat_range[0];
const float y = rescale(j, height) * s->flat_range[1];
const float r = hypotf(x, y);
const float theta = atanf(r) * 2.f;
const float sin_theta = sinf(theta);
vec[0] = x / r * sin_theta;
vec[1] = y / r * sin_theta;
vec[2] = cosf(theta);
return 1;
}
/**
* Prepare data for processing stereographic input format.
*
* @param ctx filter context
*
* @return error code
*/
static int prepare_stereographic_in(AVFilterContext *ctx)
{
V360Context *s = ctx->priv;
s->iflat_range[0] = tanf(FFMIN(s->ih_fov, 359.f) * M_PI / 720.f);
s->iflat_range[1] = tanf(FFMIN(s->iv_fov, 359.f) * M_PI / 720.f);
return 0;
}
/**
* Calculate frame position in stereographic format for corresponding 3D coordinates on sphere.
*
* @param s filter private context
* @param vec coordinates on sphere
* @param width frame width
* @param height frame height
* @param us horizontal coordinates for interpolation window
* @param vs vertical coordinates for interpolation window
* @param du horizontal relative coordinate
* @param dv vertical relative coordinate
*/
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)
{
const float theta = acosf(vec[2]);
const float r = tanf(theta * 0.5f);
const float c = r / hypotf(vec[0], vec[1]);
const float x = vec[0] * c / s->iflat_range[0];
const float y = vec[1] * c / s->iflat_range[1];
const float uf = scale(x, width);
const float vf = scale(y, height);
const int ui = floorf(uf);
const int vi = floorf(vf);
const int visible = isfinite(x) && isfinite(y) && vi >= 0 && vi < height && ui >= 0 && ui < width;
*du = visible ? uf - ui : 0.f;
*dv = visible ? vf - vi : 0.f;
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
us[i][j] = visible ? av_clip(ui + j - 1, 0, width - 1) : 0;
vs[i][j] = visible ? av_clip(vi + i - 1, 0, height - 1) : 0;
}
}
return visible;
}
/**
* Prepare data for processing equisolid output format.
*
* @param ctx filter context
*
* @return error code
*/
static int prepare_equisolid_out(AVFilterContext *ctx)
{
V360Context *s = ctx->priv;
s->flat_range[0] = sinf(s->h_fov * M_PI / 720.f);
s->flat_range[1] = sinf(s->v_fov * M_PI / 720.f);
return 0;
}
/**
* Calculate 3D coordinates on sphere for corresponding frame position in equisolid format.
*
* @param s filter private context
* @param i horizontal position on frame [0, width)
* @param j vertical position on frame [0, height)
* @param width frame width
* @param height frame height
* @param vec coordinates on sphere
*/
static int equisolid_to_xyz(const V360Context *s,
int i, int j, int width, int height,
float *vec)
{
const float x = rescale(i, width) * s->flat_range[0];
const float y = rescale(j, height) * s->flat_range[1];
const float r = hypotf(x, y);
const float theta = asinf(r) * 2.f;
const float sin_theta = sinf(theta);
vec[0] = x / r * sin_theta;
vec[1] = y / r * sin_theta;
vec[2] = cosf(theta);
return 1;
}
/**
* Prepare data for processing equisolid input format.
*
* @param ctx filter context
*
* @return error code
*/
static int prepare_equisolid_in(AVFilterContext *ctx)
{
V360Context *s = ctx->priv;
s->iflat_range[0] = sinf(FFMIN(s->ih_fov, 359.f) * M_PI / 720.f);
s->iflat_range[1] = sinf(FFMIN(s->iv_fov, 359.f) * M_PI / 720.f);
return 0;
}
/**
* Calculate frame position in equisolid format for corresponding 3D coordinates on sphere.
*
* @param s filter private context
* @param vec coordinates on sphere
* @param width frame width
* @param height frame height
* @param us horizontal coordinates for interpolation window
* @param vs vertical coordinates for interpolation window
* @param du horizontal relative coordinate
* @param dv vertical relative coordinate
*/
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)
{
const float theta = acosf(vec[2]);
const float r = sinf(theta * 0.5f);
const float c = r / hypotf(vec[0], vec[1]);
const float x = vec[0] * c / s->iflat_range[0];
const float y = vec[1] * c / s->iflat_range[1];
const float uf = scale(x, width);
const float vf = scale(y, height);
const int ui = floorf(uf);
const int vi = floorf(vf);
const int visible = isfinite(x) && isfinite(y) && vi >= 0 && vi < height && ui >= 0 && ui < width;
*du = visible ? uf - ui : 0.f;
*dv = visible ? vf - vi : 0.f;
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
us[i][j] = visible ? av_clip(ui + j - 1, 0, width - 1) : 0;
vs[i][j] = visible ? av_clip(vi + i - 1, 0, height - 1) : 0;
}
}
return visible;
}
/**
* Prepare data for processing orthographic output format.
*
* @param ctx filter context
*
* @return error code
*/
static int prepare_orthographic_out(AVFilterContext *ctx)
{
V360Context *s = ctx->priv;
s->flat_range[0] = sinf(FFMIN(s->h_fov, 180.f) * M_PI / 360.f);
s->flat_range[1] = sinf(FFMIN(s->v_fov, 180.f) * M_PI / 360.f);
return 0;
}
/**
* Calculate 3D coordinates on sphere for corresponding frame position in orthographic format.
*
* @param s filter private context
* @param i horizontal position on frame [0, width)
* @param j vertical position on frame [0, height)
* @param width frame width
* @param height frame height
* @param vec coordinates on sphere
*/
static int orthographic_to_xyz(const V360Context *s,
int i, int j, int width, int height,
float *vec)
{
const float x = rescale(i, width) * s->flat_range[0];
const float y = rescale(j, height) * s->flat_range[1];
const float r = hypotf(x, y);
const float theta = asinf(r);
vec[2] = cosf(theta);
if (vec[2] > 0) {
vec[0] = x;
vec[1] = y;
return 1;
} else {
vec[0] = 0.f;
vec[1] = 0.f;
vec[2] = 1.f;
return 0;
}
}
/**
* Prepare data for processing orthographic input format.
*
* @param ctx filter context
*
* @return error code
*/
static int prepare_orthographic_in(AVFilterContext *ctx)
{
V360Context *s = ctx->priv;
s->iflat_range[0] = sinf(FFMIN(s->ih_fov, 180.f) * M_PI / 360.f);
s->iflat_range[1] = sinf(FFMIN(s->iv_fov, 180.f) * M_PI / 360.f);
return 0;
}
/**
* Calculate frame position in orthographic format for corresponding 3D coordinates on sphere.
*
* @param s filter private context
* @param vec coordinates on sphere
* @param width frame width
* @param height frame height
* @param us horizontal coordinates for interpolation window
* @param vs vertical coordinates for interpolation window
* @param du horizontal relative coordinate
* @param dv vertical relative coordinate
*/
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)
{
const float theta = acosf(vec[2]);
const float r = sinf(theta);
const float c = r / hypotf(vec[0], vec[1]);
const float x = vec[0] * c / s->iflat_range[0];
const float y = vec[1] * c / s->iflat_range[1];
const float uf = scale(x, width);
const float vf = scale(y, height);
const int ui = floorf(uf);
const int vi = floorf(vf);
const int visible = vec[2] >= 0.f && isfinite(x) && isfinite(y) && vi >= 0 && vi < height && ui >= 0 && ui < width;
*du = visible ? uf - ui : 0.f;
*dv = visible ? vf - vi : 0.f;
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
us[i][j] = visible ? av_clip(ui + j - 1, 0, width - 1) : 0;
vs[i][j] = visible ? av_clip(vi + i - 1, 0, height - 1) : 0;
}
}
return visible;
}
/**
* Prepare data for processing equirectangular input format.
*
* @param ctx filter context
*
* @return error code
*/
static int prepare_equirect_in(AVFilterContext *ctx)
{
V360Context *s = ctx->priv;
s->iflat_range[0] = s->ih_fov * M_PI / 360.f;
s->iflat_range[1] = s->iv_fov * M_PI / 360.f;
return 0;
}
/**
* Calculate frame position in equirectangular format for corresponding 3D coordinates on sphere.
*
* @param s filter private context
* @param vec coordinates on sphere
* @param width frame width
* @param height frame height
* @param us horizontal coordinates for interpolation window
* @param vs vertical coordinates for interpolation window
* @param du horizontal relative coordinate
* @param dv vertical relative coordinate
*/
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)
{
const float phi = atan2f(vec[0], vec[2]) / s->iflat_range[0];
const float theta = asinf(vec[1]) / s->iflat_range[1];
const float uf = scale(phi, width);
const float vf = scale(theta, height);
const int ui = floorf(uf);
const int vi = floorf(vf);
int visible;
*du = uf - ui;
*dv = vf - vi;
visible = vi >= 0 && vi < height && ui >= 0 && ui < width;
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
us[i][j] = ereflectx(ui + j - 1, vi + i - 1, width, height);
vs[i][j] = reflecty(vi + i - 1, height);
}
}
return visible;
}
/**
* Calculate frame position in half equirectangular format for corresponding 3D coordinates on sphere.
*
* @param s filter private context
* @param vec coordinates on sphere
* @param width frame width
* @param height frame height
* @param us horizontal coordinates for interpolation window
* @param vs vertical coordinates for interpolation window
* @param du horizontal relative coordinate
* @param dv vertical relative coordinate
*/
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)
{
const float phi = atan2f(vec[0], vec[2]) / M_PI_2;
const float theta = asinf(vec[1]) / M_PI_2;
const float uf = scale(phi, width);
const float vf = scale(theta, height);
const int ui = floorf(uf);
const int vi = floorf(vf);
const int visible = phi >= -M_PI_2 && phi <= M_PI_2;
*du = uf - ui;
*dv = vf - vi;
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
us[i][j] = av_clip(ui + j - 1, 0, width - 1);
vs[i][j] = av_clip(vi + i - 1, 0, height - 1);
}
}
return visible;
}
/**
* Prepare data for processing flat input format.
*
* @param ctx filter context
*
* @return error code
*/
static int prepare_flat_in(AVFilterContext *ctx)
{
V360Context *s = ctx->priv;
s->iflat_range[0] = tanf(0.5f * s->ih_fov * M_PI / 180.f);
s->iflat_range[1] = tanf(0.5f * s->iv_fov * M_PI / 180.f);
return 0;
}
/**
* Calculate frame position in flat format for corresponding 3D coordinates on sphere.
*
* @param s filter private context
* @param vec coordinates on sphere
* @param width frame width
* @param height frame height
* @param us horizontal coordinates for interpolation window
* @param vs vertical coordinates for interpolation window
* @param du horizontal relative coordinate
* @param dv vertical relative coordinate
*/
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)
{
const float theta = acosf(vec[2]);
const float r = tanf(theta);
const float rr = fabsf(r) < 1e+6f ? r : hypotf(width, height);
const float zf = vec[2];
const float h = hypotf(vec[0], vec[1]);
const float c = h <= 1e-6f ? 1.f : rr / h;
float uf = vec[0] * c / s->iflat_range[0];
float vf = vec[1] * c / s->iflat_range[1];
int visible, ui, vi;
uf = zf >= 0.f ? scale(uf, width) : 0.f;
vf = zf >= 0.f ? scale(vf, height) : 0.f;
ui = floorf(uf);
vi = floorf(vf);
visible = vi >= 0 && vi < height && ui >= 0 && ui < width && zf >= 0.f;
*du = uf - ui;
*dv = vf - vi;
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
us[i][j] = visible ? av_clip(ui + j - 1, 0, width - 1) : 0;
vs[i][j] = visible ? av_clip(vi + i - 1, 0, height - 1) : 0;
}
}
return visible;
}
/**
* Calculate frame position in mercator format for corresponding 3D coordinates on sphere.
*
* @param s filter private context
* @param vec coordinates on sphere
* @param width frame width
* @param height frame height
* @param us horizontal coordinates for interpolation window
* @param vs vertical coordinates for interpolation window
* @param du horizontal relative coordinate
* @param dv vertical relative coordinate
*/
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)
{
const float phi = atan2f(vec[0], vec[2]) / M_PI;
const float theta = av_clipf(logf((1.f + vec[1]) / (1.f - vec[1])) / (2.f * M_PI), -1.f, 1.f);
const float uf = scale(phi, width);
const float vf = scale(theta, height);
const int ui = floorf(uf);
const int vi = floorf(vf);
*du = uf - ui;
*dv = vf - vi;
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
us[i][j] = av_clip(ui + j - 1, 0, width - 1);
vs[i][j] = av_clip(vi + i - 1, 0, height - 1);
}
}
return 1;
}
/**
* Calculate 3D coordinates on sphere for corresponding frame position in mercator format.
*
* @param s filter private context
* @param i horizontal position on frame [0, width)
* @param j vertical position on frame [0, height)
* @param width frame width
* @param height frame height
* @param vec coordinates on sphere
*/
static int mercator_to_xyz(const V360Context *s,
int i, int j, int width, int height,
float *vec)
{
const float phi = rescale(i, width) * M_PI + M_PI_2;
const float y = rescale(j, height) * M_PI;
const float div = expf(2.f * y) + 1.f;
const float sin_phi = sinf(phi);
const float cos_phi = cosf(phi);
const float sin_theta = 2.f * expf(y) / div;
const float cos_theta = (expf(2.f * y) - 1.f) / div;
vec[0] = -sin_theta * cos_phi;
vec[1] = cos_theta;
vec[2] = sin_theta * sin_phi;
return 1;
}
/**
* Calculate frame position in ball format for corresponding 3D coordinates on sphere.
*
* @param s filter private context
* @param vec coordinates on sphere
* @param width frame width
* @param height frame height
* @param us horizontal coordinates for interpolation window
* @param vs vertical coordinates for interpolation window
* @param du horizontal relative coordinate
* @param dv vertical relative coordinate
*/
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)
{
const float l = hypotf(vec[0], vec[1]);
const float r = sqrtf(1.f - vec[2]) / M_SQRT2;
const float d = l > 0.f ? l : 1.f;
const float uf = scale(r * vec[0] / d, width);
const float vf = scale(r * vec[1] / d, height);
const int ui = floorf(uf);
const int vi = floorf(vf);
*du = uf - ui;
*dv = vf - vi;
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
us[i][j] = av_clip(ui + j - 1, 0, width - 1);
vs[i][j] = av_clip(vi + i - 1, 0, height - 1);
}
}
return 1;
}
/**
* Calculate 3D coordinates on sphere for corresponding frame position in ball format.
*
* @param s filter private context
* @param i horizontal position on frame [0, width)
* @param j vertical position on frame [0, height)
* @param width frame width
* @param height frame height
* @param vec coordinates on sphere
*/
static int ball_to_xyz(const V360Context *s,
int i, int j, int width, int height,
float *vec)
{
const float x = rescale(i, width);
const float y = rescale(j, height);
const float l = hypotf(x, y);
if (l <= 1.f) {
const float z = 2.f * l * sqrtf(1.f - l * l);
vec[0] = z * x / (l > 0.f ? l : 1.f);
vec[1] = z * y / (l > 0.f ? l : 1.f);
vec[2] = 1.f - 2.f * l * l;
} else {
vec[0] = 0.f;
vec[1] = 1.f;
vec[2] = 0.f;
return 0;
}
return 1;
}
/**
* Calculate 3D coordinates on sphere for corresponding frame position in hammer format.
*
* @param s filter private context
* @param i horizontal position on frame [0, width)
* @param j vertical position on frame [0, height)
* @param width frame width
* @param height frame height
* @param vec coordinates on sphere
*/
static int hammer_to_xyz(const V360Context *s,
int i, int j, int width, int height,
float *vec)
{
const float x = rescale(i, width);
const float y = rescale(j, height);
const float xx = x * x;
const float yy = y * y;
const float z = sqrtf(1.f - xx * 0.5f - yy * 0.5f);
const float a = M_SQRT2 * x * z;
const float b = 2.f * z * z - 1.f;
const float aa = a * a;
const float bb = b * b;
const float w = sqrtf(1.f - 2.f * yy * z * z);
vec[0] = w * 2.f * a * b / (aa + bb);
vec[1] = M_SQRT2 * y * z;
vec[2] = w * (bb - aa) / (aa + bb);
return 1;
}
/**
* Calculate frame position in hammer format for corresponding 3D coordinates on sphere.
*
* @param s filter private context
* @param vec coordinates on sphere
* @param width frame width
* @param height frame height
* @param us horizontal coordinates for interpolation window
* @param vs vertical coordinates for interpolation window
* @param du horizontal relative coordinate
* @param dv vertical relative coordinate
*/
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)
{
const float theta = atan2f(vec[0], vec[2]);
const float z = sqrtf(1.f + sqrtf(1.f - vec[1] * vec[1]) * cosf(theta * 0.5f));
const float x = sqrtf(1.f - vec[1] * vec[1]) * sinf(theta * 0.5f) / z;
const float y = vec[1] / z;
const float uf = (x + 1.f) * width / 2.f;
const float vf = (y + 1.f) * height / 2.f;
const int ui = floorf(uf);
const int vi = floorf(vf);
*du = uf - ui;
*dv = vf - vi;
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
us[i][j] = av_clip(ui + j - 1, 0, width - 1);
vs[i][j] = av_clip(vi + i - 1, 0, height - 1);
}
}
return 1;
}
/**
* Calculate 3D coordinates on sphere for corresponding frame position in sinusoidal format.
*
* @param s filter private context
* @param i horizontal position on frame [0, width)
* @param j vertical position on frame [0, height)
* @param width frame width
* @param height frame height
* @param vec coordinates on sphere
*/
static int sinusoidal_to_xyz(const V360Context *s,
int i, int j, int width, int height,
float *vec)
{
const float theta = rescale(j, height) * M_PI_2;
const float phi = rescale(i, width) * M_PI / cosf(theta);
const float sin_phi = sinf(phi);
const float cos_phi = cosf(phi);
const float sin_theta = sinf(theta);
const float cos_theta = cosf(theta);
vec[0] = cos_theta * sin_phi;
vec[1] = sin_theta;
vec[2] = cos_theta * cos_phi;
return 1;
}
/**
* Calculate frame position in sinusoidal format for corresponding 3D coordinates on sphere.
*
* @param s filter private context
* @param vec coordinates on sphere
* @param width frame width
* @param height frame height
* @param us horizontal coordinates for interpolation window
* @param vs vertical coordinates for interpolation window
* @param du horizontal relative coordinate
* @param dv vertical relative coordinate
*/
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)
{
const float theta = asinf(vec[1]);
const float phi = atan2f(vec[0], vec[2]) * cosf(theta);
const float uf = scale(phi / M_PI, width);
const float vf = scale(theta / M_PI_2, height);
const int ui = floorf(uf);
const int vi = floorf(vf);
*du = uf - ui;
*dv = vf - vi;
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
us[i][j] = av_clip(ui + j - 1, 0, width - 1);
vs[i][j] = av_clip(vi + i - 1, 0, height - 1);
}
}
return 1;
}
/**
* Prepare data for processing equi-angular cubemap input format.
*
* @param ctx filter context
*
* @return error code
*/
static int prepare_eac_in(AVFilterContext *ctx)
{
V360Context *s = ctx->priv;
s->in_cubemap_face_order[RIGHT] = TOP_RIGHT;
s->in_cubemap_face_order[LEFT] = TOP_LEFT;
s->in_cubemap_face_order[UP] = BOTTOM_RIGHT;
s->in_cubemap_face_order[DOWN] = BOTTOM_LEFT;
s->in_cubemap_face_order[FRONT] = TOP_MIDDLE;
s->in_cubemap_face_order[BACK] = BOTTOM_MIDDLE;
s->in_cubemap_face_rotation[TOP_LEFT] = ROT_0;
s->in_cubemap_face_rotation[TOP_MIDDLE] = ROT_0;
s->in_cubemap_face_rotation[TOP_RIGHT] = ROT_0;
s->in_cubemap_face_rotation[BOTTOM_LEFT] = ROT_270;
s->in_cubemap_face_rotation[BOTTOM_MIDDLE] = ROT_90;
s->in_cubemap_face_rotation[BOTTOM_RIGHT] = ROT_270;
return 0;
}
/**
* Prepare data for processing equi-angular cubemap output format.
*
* @param ctx filter context
*
* @return error code
*/
static int prepare_eac_out(AVFilterContext *ctx)
{
V360Context *s = ctx->priv;
s->out_cubemap_direction_order[TOP_LEFT] = LEFT;
s->out_cubemap_direction_order[TOP_MIDDLE] = FRONT;
s->out_cubemap_direction_order[TOP_RIGHT] = RIGHT;
s->out_cubemap_direction_order[BOTTOM_LEFT] = DOWN;
s->out_cubemap_direction_order[BOTTOM_MIDDLE] = BACK;
s->out_cubemap_direction_order[BOTTOM_RIGHT] = UP;
s->out_cubemap_face_rotation[TOP_LEFT] = ROT_0;
s->out_cubemap_face_rotation[TOP_MIDDLE] = ROT_0;
s->out_cubemap_face_rotation[TOP_RIGHT] = ROT_0;
s->out_cubemap_face_rotation[BOTTOM_LEFT] = ROT_270;
s->out_cubemap_face_rotation[BOTTOM_MIDDLE] = ROT_90;
s->out_cubemap_face_rotation[BOTTOM_RIGHT] = ROT_270;
return 0;
}
/**
* Calculate 3D coordinates on sphere for corresponding frame position in equi-angular cubemap format.
*
* @param s filter private context
* @param i horizontal position on frame [0, width)
* @param j vertical position on frame [0, height)
* @param width frame width
* @param height frame height
* @param vec coordinates on sphere
*/
static int eac_to_xyz(const V360Context *s,
int i, int j, int width, int height,
float *vec)
{
const float pixel_pad = 2;
const float u_pad = pixel_pad / width;
const float v_pad = pixel_pad / height;
int u_face, v_face, face;
float l_x, l_y, l_z;
float uf = (i + 0.5f) / width;
float vf = (j + 0.5f) / height;
// EAC has 2-pixel padding on faces except between faces on the same row
// Padding pixels seems not to be stretched with tangent as regular pixels
// Formulas below approximate original padding as close as I could get experimentally
// Horizontal padding
uf = 3.f * (uf - u_pad) / (1.f - 2.f * u_pad);
if (uf < 0.f) {
u_face = 0;
uf -= 0.5f;
} else if (uf >= 3.f) {
u_face = 2;
uf -= 2.5f;
} else {
u_face = floorf(uf);
uf = fmodf(uf, 1.f) - 0.5f;
}
// Vertical padding
v_face = floorf(vf * 2.f);
vf = (vf - v_pad - 0.5f * v_face) / (0.5f - 2.f * v_pad) - 0.5f;
if (uf >= -0.5f && uf < 0.5f) {
uf = tanf(M_PI_2 * uf);
} else {
uf = 2.f * uf;
}
if (vf >= -0.5f && vf < 0.5f) {
vf = tanf(M_PI_2 * vf);
} else {
vf = 2.f * vf;
}
face = u_face + 3 * v_face;
switch (face) {
case TOP_LEFT:
l_x = -1.f;
l_y = vf;
l_z = uf;
break;
case TOP_MIDDLE:
l_x = uf;
l_y = vf;
l_z = 1.f;
break;
case TOP_RIGHT:
l_x = 1.f;
l_y = vf;
l_z = -uf;
break;
case BOTTOM_LEFT:
l_x = -vf;
l_y = 1.f;
l_z = -uf;
break;
case BOTTOM_MIDDLE:
l_x = -vf;
l_y = -uf;
l_z = -1.f;
break;
case BOTTOM_RIGHT:
l_x = -vf;
l_y = -1.f;
l_z = uf;
break;
default:
av_assert0(0);
}
vec[0] = l_x;
vec[1] = l_y;
vec[2] = l_z;
return 1;
}
/**
* Calculate frame position in equi-angular cubemap format for corresponding 3D coordinates on sphere.
*
* @param s filter private context
* @param vec coordinates on sphere
* @param width frame width
* @param height frame height
* @param us horizontal coordinates for interpolation window
* @param vs vertical coordinates for interpolation window
* @param du horizontal relative coordinate
* @param dv vertical relative coordinate
*/
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)
{
const float pixel_pad = 2;
const float u_pad = pixel_pad / width;
const float v_pad = pixel_pad / height;
float uf, vf;
int ui, vi;
int direction, face;
int u_face, v_face;
xyz_to_cube(s, vec, &uf, &vf, &direction);
face = s->in_cubemap_face_order[direction];
u_face = face % 3;
v_face = face / 3;
uf = M_2_PI * atanf(uf) + 0.5f;
vf = M_2_PI * atanf(vf) + 0.5f;
// These formulas are inversed from eac_to_xyz ones
uf = (uf + u_face) * (1.f - 2.f * u_pad) / 3.f + u_pad;
vf = vf * (0.5f - 2.f * v_pad) + v_pad + 0.5f * v_face;
uf *= width;
vf *= height;
uf -= 0.5f;
vf -= 0.5f;
ui = floorf(uf);
vi = floorf(vf);
*du = uf - ui;
*dv = vf - vi;
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
us[i][j] = av_clip(ui + j - 1, 0, width - 1);
vs[i][j] = av_clip(vi + i - 1, 0, height - 1);
}
}
return 1;
}
/**
* Prepare data for processing flat output format.
*
* @param ctx filter context
*
* @return error code
*/
static int prepare_flat_out(AVFilterContext *ctx)
{
V360Context *s = ctx->priv;
s->flat_range[0] = tanf(0.5f * s->h_fov * M_PI / 180.f);
s->flat_range[1] = tanf(0.5f * s->v_fov * M_PI / 180.f);
return 0;
}
/**
* Calculate 3D coordinates on sphere for corresponding frame position in flat format.
*
* @param s filter private context
* @param i horizontal position on frame [0, width)
* @param j vertical position on frame [0, height)
* @param width frame width
* @param height frame height
* @param vec coordinates on sphere
*/
static int flat_to_xyz(const V360Context *s,
int i, int j, int width, int height,
float *vec)
{
const float l_x = s->flat_range[0] * rescale(i, width);
const float l_y = s->flat_range[1] * rescale(j, height);
vec[0] = l_x;
vec[1] = l_y;
vec[2] = 1.f;
return 1;
}
/**
* Prepare data for processing fisheye output format.
*
* @param ctx filter context
*
* @return error code
*/
static int prepare_fisheye_out(AVFilterContext *ctx)
{
V360Context *s = ctx->priv;
s->flat_range[0] = s->h_fov / 180.f;
s->flat_range[1] = s->v_fov / 180.f;
return 0;
}
/**
* Calculate 3D coordinates on sphere for corresponding frame position in fisheye format.
*
* @param s filter private context
* @param i horizontal position on frame [0, width)
* @param j vertical position on frame [0, height)
* @param width frame width
* @param height frame height
* @param vec coordinates on sphere
*/
static int fisheye_to_xyz(const V360Context *s,
int i, int j, int width, int height,
float *vec)
{
const float uf = s->flat_range[0] * rescale(i, width);
const float vf = s->flat_range[1] * rescale(j, height);
const float phi = atan2f(vf, uf);
const float theta = M_PI_2 * (1.f - hypotf(uf, vf));
const float sin_phi = sinf(phi);
const float cos_phi = cosf(phi);
const float sin_theta = sinf(theta);
const float cos_theta = cosf(theta);
vec[0] = cos_theta * cos_phi;
vec[1] = cos_theta * sin_phi;
vec[2] = sin_theta;
return 1;
}
/**
* Prepare data for processing fisheye input format.
*
* @param ctx filter context
*
* @return error code
*/
static int prepare_fisheye_in(AVFilterContext *ctx)
{
V360Context *s = ctx->priv;
s->iflat_range[0] = s->ih_fov / 180.f;
s->iflat_range[1] = s->iv_fov / 180.f;
return 0;
}
/**
* Calculate frame position in fisheye format for corresponding 3D coordinates on sphere.
*
* @param s filter private context
* @param vec coordinates on sphere
* @param width frame width
* @param height frame height
* @param us horizontal coordinates for interpolation window
* @param vs vertical coordinates for interpolation window
* @param du horizontal relative coordinate
* @param dv vertical relative coordinate
*/
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)
{
const float h = hypotf(vec[0], vec[1]);
const float lh = h > 0.f ? h : 1.f;
const float phi = atan2f(h, vec[2]) / M_PI;
float uf = vec[0] / lh * phi / s->iflat_range[0];
float vf = vec[1] / lh * phi / s->iflat_range[1];
const int visible = -0.5f < uf && uf < 0.5f && -0.5f < vf && vf < 0.5f;
int ui, vi;
uf = scale(uf * 2.f, width);
vf = scale(vf * 2.f, height);
ui = floorf(uf);
vi = floorf(vf);
*du = visible ? uf - ui : 0.f;
*dv = visible ? vf - vi : 0.f;
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
us[i][j] = visible ? av_clip(ui + j - 1, 0, width - 1) : 0;
vs[i][j] = visible ? av_clip(vi + i - 1, 0, height - 1) : 0;
}
}
return visible;
}
/**
* Calculate 3D coordinates on sphere for corresponding frame position in pannini format.
*
* @param s filter private context
* @param i horizontal position on frame [0, width)
* @param j vertical position on frame [0, height)
* @param width frame width
* @param height frame height
* @param vec coordinates on sphere
*/
static int pannini_to_xyz(const V360Context *s,
int i, int j, int width, int height,
float *vec)
{
const float uf = rescale(i, width);
const float vf = rescale(j, height);
const float d = s->h_fov;
const float k = uf * uf / ((d + 1.f) * (d + 1.f));
const float dscr = k * k * d * d - (k + 1.f) * (k * d * d - 1.f);
const float clon = (-k * d + sqrtf(dscr)) / (k + 1.f);
const float S = (d + 1.f) / (d + clon);
const float lon = atan2f(uf, S * clon);
const float lat = atan2f(vf, S);
vec[0] = sinf(lon) * cosf(lat);
vec[1] = sinf(lat);
vec[2] = cosf(lon) * cosf(lat);
return 1;
}
/**
* Calculate frame position in pannini format for corresponding 3D coordinates on sphere.
*
* @param s filter private context
* @param vec coordinates on sphere
* @param width frame width
* @param height frame height
* @param us horizontal coordinates for interpolation window
* @param vs vertical coordinates for interpolation window
* @param du horizontal relative coordinate
* @param dv vertical relative coordinate
*/
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)
{
const float phi = atan2f(vec[0], vec[2]);
const float theta = asinf(vec[1]);
const float d = s->ih_fov;
const float S = (d + 1.f) / (d + cosf(phi));
const float x = S * sinf(phi);
const float y = S * tanf(theta);
const float uf = scale(x, width);
const float vf = scale(y, height);
const int ui = floorf(uf);
const int vi = floorf(vf);
const int visible = vi >= 0 && vi < height && ui >= 0 && ui < width && vec[2] >= 0.f;
*du = uf - ui;
*dv = vf - vi;
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
us[i][j] = visible ? av_clip(ui + j - 1, 0, width - 1) : 0;
vs[i][j] = visible ? av_clip(vi + i - 1, 0, height - 1) : 0;
}
}
return visible;
}
/**
* Prepare data for processing cylindrical output format.
*
* @param ctx filter context
*
* @return error code
*/
static int prepare_cylindrical_out(AVFilterContext *ctx)
{
V360Context *s = ctx->priv;
s->flat_range[0] = M_PI * s->h_fov / 360.f;
s->flat_range[1] = tanf(0.5f * s->v_fov * M_PI / 180.f);
return 0;
}
/**
* Calculate 3D coordinates on sphere for corresponding frame position in cylindrical format.
*
* @param s filter private context
* @param i horizontal position on frame [0, width)
* @param j vertical position on frame [0, height)
* @param width frame width
* @param height frame height
* @param vec coordinates on sphere
*/
static int cylindrical_to_xyz(const V360Context *s,
int i, int j, int width, int height,
float *vec)
{
const float uf = s->flat_range[0] * rescale(i, width);
const float vf = s->flat_range[1] * rescale(j, height);
const float phi = uf;
const float theta = atanf(vf);
const float sin_phi = sinf(phi);
const float cos_phi = cosf(phi);
const float sin_theta = sinf(theta);
const float cos_theta = cosf(theta);
vec[0] = cos_theta * sin_phi;
vec[1] = sin_theta;
vec[2] = cos_theta * cos_phi;
return 1;
}
/**
* Prepare data for processing cylindrical input format.
*
* @param ctx filter context
*
* @return error code
*/
static int prepare_cylindrical_in(AVFilterContext *ctx)
{
V360Context *s = ctx->priv;
s->iflat_range[0] = M_PI * s->ih_fov / 360.f;
s->iflat_range[1] = tanf(0.5f * s->iv_fov * M_PI / 180.f);
return 0;
}
/**
* Calculate frame position in cylindrical format for corresponding 3D coordinates on sphere.
*
* @param s filter private context
* @param vec coordinates on sphere
* @param width frame width
* @param height frame height
* @param us horizontal coordinates for interpolation window
* @param vs vertical coordinates for interpolation window
* @param du horizontal relative coordinate
* @param dv vertical relative coordinate
*/
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)
{
const float phi = atan2f(vec[0], vec[2]) / s->iflat_range[0];
const float theta = asinf(vec[1]);
const float uf = scale(phi, width);
const float vf = scale(tanf(theta) / s->iflat_range[1], height);
const int ui = floorf(uf);
const int vi = floorf(vf);
const int visible = vi >= 0 && vi < height && ui >= 0 && ui < width &&
theta <= M_PI * s->iv_fov / 180.f &&
theta >= -M_PI * s->iv_fov / 180.f;
*du = uf - ui;
*dv = vf - vi;
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
us[i][j] = visible ? av_clip(ui + j - 1, 0, width - 1) : 0;
vs[i][j] = visible ? av_clip(vi + i - 1, 0, height - 1) : 0;
}
}
return visible;
}
/**
* Prepare data for processing cylindrical equal area output format.
*
* @param ctx filter context
*
* @return error code
*/
static int prepare_cylindricalea_out(AVFilterContext *ctx)
{
V360Context *s = ctx->priv;
s->flat_range[0] = s->h_fov * M_PI / 360.f;
s->flat_range[1] = s->v_fov / 180.f;
return 0;
}
/**
* Prepare data for processing cylindrical equal area input format.
*
* @param ctx filter context
*
* @return error code
*/
static int prepare_cylindricalea_in(AVFilterContext *ctx)
{
V360Context *s = ctx->priv;
s->iflat_range[0] = M_PI * s->ih_fov / 360.f;
s->iflat_range[1] = s->iv_fov / 180.f;
return 0;
}
/**
* Calculate 3D coordinates on sphere for corresponding frame position in cylindrical equal area format.
*
* @param s filter private context
* @param i horizontal position on frame [0, width)
* @param j vertical position on frame [0, height)
* @param width frame width
* @param height frame height
* @param vec coordinates on sphere
*/
static int cylindricalea_to_xyz(const V360Context *s,
int i, int j, int width, int height,
float *vec)
{
const float uf = s->flat_range[0] * rescale(i, width);
const float vf = s->flat_range[1] * rescale(j, height);
const float phi = uf;
const float theta = asinf(vf);
const float sin_phi = sinf(phi);
const float cos_phi = cosf(phi);
const float sin_theta = sinf(theta);
const float cos_theta = cosf(theta);
vec[0] = cos_theta * sin_phi;
vec[1] = sin_theta;
vec[2] = cos_theta * cos_phi;
return 1;
}
/**
* Calculate frame position in cylindrical equal area format for corresponding 3D coordinates on sphere.
*
* @param s filter private context
* @param vec coordinates on sphere
* @param width frame width
* @param height frame height
* @param us horizontal coordinates for interpolation window
* @param vs vertical coordinates for interpolation window
* @param du horizontal relative coordinate
* @param dv vertical relative coordinate
*/
static int xyz_to_cylindricalea(const V360Context *s,
const float *vec, int width, int height,
int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
{
const float phi = atan2f(vec[0], vec[2]) / s->iflat_range[0];
const float theta = asinf(vec[1]);
const float uf = scale(phi, width);
const float vf = scale(sinf(theta) / s->iflat_range[1], height);
const int ui = floorf(uf);
const int vi = floorf(vf);
const int visible = vi >= 0 && vi < height && ui >= 0 && ui < width &&
theta <= M_PI * s->iv_fov / 180.f &&
theta >= -M_PI * s->iv_fov / 180.f;
*du = uf - ui;
*dv = vf - vi;
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
us[i][j] = visible ? av_clip(ui + j - 1, 0, width - 1) : 0;
vs[i][j] = visible ? av_clip(vi + i - 1, 0, height - 1) : 0;
}
}
return visible;
}
/**
* Calculate 3D coordinates on sphere for corresponding frame position in perspective format.
*
* @param s filter private context
* @param i horizontal position on frame [0, width)
* @param j vertical position on frame [0, height)
* @param width frame width
* @param height frame height
* @param vec coordinates on sphere
*/
static int perspective_to_xyz(const V360Context *s,
int i, int j, int width, int height,
float *vec)
{
const float uf = rescale(i, width);
const float vf = rescale(j, height);
const float rh = hypotf(uf, vf);
const float sinzz = 1.f - rh * rh;
const float h = 1.f + s->v_fov;
const float sinz = (h - sqrtf(sinzz)) / (h / rh + rh / h);
const float sinz2 = sinz * sinz;
if (sinz2 <= 1.f) {
const float cosz = sqrtf(1.f - sinz2);
const float theta = asinf(cosz);
const float phi = atan2f(uf, vf);
const float sin_phi = sinf(phi);
const float cos_phi = cosf(phi);
const float sin_theta = sinf(theta);
const float cos_theta = cosf(theta);
vec[0] = cos_theta * sin_phi;
vec[1] = cos_theta * cos_phi;
vec[2] = sin_theta;
} else {
vec[0] = 0.f;
vec[1] = 1.f;
vec[2] = 0.f;
return 0;
}
return 1;
}
/**
* Calculate 3D coordinates on sphere for corresponding frame position in tetrahedron format.
*
* @param s filter private context
* @param i horizontal position on frame [0, width)
* @param j vertical position on frame [0, height)
* @param width frame width
* @param height frame height
* @param vec coordinates on sphere
*/
static int tetrahedron_to_xyz(const V360Context *s,
int i, int j, int width, int height,
float *vec)
{
const float uf = ((float)i + 0.5f) / width;
const float vf = ((float)j + 0.5f) / height;
vec[0] = uf < 0.5f ? uf * 4.f - 1.f : 3.f - uf * 4.f;
vec[1] = 1.f - vf * 2.f;
vec[2] = 2.f * fabsf(1.f - fabsf(1.f - uf * 2.f + vf)) - 1.f;
return 1;
}
/**
* Calculate frame position in tetrahedron format for corresponding 3D coordinates on sphere.
*
* @param s filter private context
* @param vec coordinates on sphere
* @param width frame width
* @param height frame height
* @param us horizontal coordinates for interpolation window
* @param vs vertical coordinates for interpolation window
* @param du horizontal relative coordinate
* @param dv vertical relative coordinate
*/
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)
{
const float d0 = vec[0] * 1.f + vec[1] * 1.f + vec[2] *-1.f;
const float d1 = vec[0] *-1.f + vec[1] *-1.f + vec[2] *-1.f;
const float d2 = vec[0] * 1.f + vec[1] *-1.f + vec[2] * 1.f;
const float d3 = vec[0] *-1.f + vec[1] * 1.f + vec[2] * 1.f;
const float d = FFMAX(d0, FFMAX3(d1, d2, d3));
float uf, vf, x, y, z;
int ui, vi;
x = vec[0] / d;
y = vec[1] / d;
z = -vec[2] / d;
vf = 0.5f - y * 0.5f;
if ((x + y >= 0.f && y + z >= 0.f && -z - x <= 0.f) ||
(x + y <= 0.f && -y + z >= 0.f && z - x >= 0.f)) {
uf = 0.25f * x + 0.25f;
} else {
uf = 0.75f - 0.25f * x;
}
uf *= width;
vf *= height;
ui = floorf(uf);
vi = floorf(vf);
*du = uf - ui;
*dv = vf - vi;
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
us[i][j] = reflectx(ui + j - 1, vi + i - 1, width, height);
vs[i][j] = reflecty(vi + i - 1, height);
}
}
return 1;
}
/**
* Prepare data for processing double fisheye input format.
*
* @param ctx filter context
*
* @return error code
*/
static int prepare_dfisheye_in(AVFilterContext *ctx)
{
V360Context *s = ctx->priv;
s->iflat_range[0] = s->ih_fov / 360.f;
s->iflat_range[1] = s->iv_fov / 360.f;
return 0;
}
/**
* Calculate 3D coordinates on sphere for corresponding frame position in dual fisheye format.
*
* @param s filter private context
* @param i horizontal position on frame [0, width)
* @param j vertical position on frame [0, height)
* @param width frame width
* @param height frame height
* @param vec coordinates on sphere
*/
static int dfisheye_to_xyz(const V360Context *s,
int i, int j, int width, int height,
float *vec)
{
const float ew = width * 0.5f;
const float eh = height;
const int ei = i >= ew ? i - ew : i;
const float m = i >= ew ? 1.f : -1.f;
const float uf = s->flat_range[0] * rescale(ei, ew);
const float vf = s->flat_range[1] * rescale(j, eh);
const float h = hypotf(uf, vf);
const float lh = h > 0.f ? h : 1.f;
const float theta = m * M_PI_2 * (1.f - h);
const float sin_theta = sinf(theta);
const float cos_theta = cosf(theta);
vec[0] = cos_theta * m * uf / lh;
vec[1] = cos_theta * vf / lh;
vec[2] = sin_theta;
return 1;
}
/**
* Calculate frame position in dual fisheye format for corresponding 3D coordinates on sphere.
*
* @param s filter private context
* @param vec coordinates on sphere
* @param width frame width
* @param height frame height
* @param us horizontal coordinates for interpolation window
* @param vs vertical coordinates for interpolation window
* @param du horizontal relative coordinate
* @param dv vertical relative coordinate
*/
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)
{
const float ew = width * 0.5f;
const float eh = height;
const float h = hypotf(vec[0], vec[1]);
const float lh = h > 0.f ? h : 1.f;
const float theta = acosf(fabsf(vec[2])) / M_PI;
float uf = scale(theta * (vec[0] / lh) / s->iflat_range[0], ew);
float vf = scale(theta * (vec[1] / lh) / s->iflat_range[1], eh);
int ui, vi;
int u_shift;
if (vec[2] >= 0.f) {
u_shift = ceilf(ew);
} else {
u_shift = 0;
uf = ew - uf - 1.f;
}
ui = floorf(uf);
vi = floorf(vf);
*du = uf - ui;
*dv = vf - vi;
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
us[i][j] = u_shift + av_clip(ui + j - 1, 0, ew - 1);
vs[i][j] = av_clip( vi + i - 1, 0, height - 1);
}
}
return 1;
}
/**
* Calculate 3D coordinates on sphere for corresponding frame position in barrel facebook's format.
*
* @param s filter private context
* @param i horizontal position on frame [0, width)
* @param j vertical position on frame [0, height)
* @param width frame width
* @param height frame height
* @param vec coordinates on sphere
*/
static int barrel_to_xyz(const V360Context *s,
int i, int j, int width, int height,
float *vec)
{
const float scale = 0.99f;
float l_x, l_y, l_z;
if (i < 4 * width / 5) {
const float theta_range = M_PI_4;
const int ew = 4 * width / 5;
const int eh = height;
const float phi = rescale(i, ew) * M_PI / scale;
const float theta = rescale(j, eh) * theta_range / scale;
const float sin_phi = sinf(phi);
const float cos_phi = cosf(phi);
const float sin_theta = sinf(theta);
const float cos_theta = cosf(theta);
l_x = cos_theta * sin_phi;
l_y = sin_theta;
l_z = cos_theta * cos_phi;
} else {
const int ew = width / 5;
const int eh = height / 2;
float uf, vf;
if (j < eh) { // UP
uf = rescale(i - 4 * ew, ew);
vf = rescale(j, eh);
uf /= scale;
vf /= scale;
l_x = uf;
l_y = -1.f;
l_z = vf;
} else { // DOWN
uf = rescale(i - 4 * ew, ew);
vf = rescale(j - eh, eh);
uf /= scale;
vf /= scale;
l_x = uf;
l_y = 1.f;
l_z = -vf;
}
}
vec[0] = l_x;
vec[1] = l_y;
vec[2] = l_z;
return 1;
}
/**
* Calculate frame position in barrel facebook's format for corresponding 3D coordinates on sphere.
*
* @param s filter private context
* @param vec coordinates on sphere
* @param width frame width
* @param height frame height
* @param us horizontal coordinates for interpolation window
* @param vs vertical coordinates for interpolation window
* @param du horizontal relative coordinate
* @param dv vertical relative coordinate
*/
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)
{
const float scale = 0.99f;
const float phi = atan2f(vec[0], vec[2]);
const float theta = asinf(vec[1]);
const float theta_range = M_PI_4;
int ew, eh;
int u_shift, v_shift;
float uf, vf;
int ui, vi;
if (theta > -theta_range && theta < theta_range) {
ew = 4 * width / 5;
eh = height;
u_shift = 0;
v_shift = 0;
uf = (phi / M_PI * scale + 1.f) * ew / 2.f;
vf = (theta / theta_range * scale + 1.f) * eh / 2.f;
} else {
ew = width / 5;
eh = height / 2;
u_shift = 4 * ew;
if (theta < 0.f) { // UP
uf = -vec[0] / vec[1];
vf = -vec[2] / vec[1];
v_shift = 0;
} else { // DOWN
uf = vec[0] / vec[1];
vf = -vec[2] / vec[1];
v_shift = eh;
}
uf = 0.5f * ew * (uf * scale + 1.f);
vf = 0.5f * eh * (vf * scale + 1.f);
}
ui = floorf(uf);
vi = floorf(vf);
*du = uf - ui;
*dv = vf - vi;
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
us[i][j] = u_shift + av_clip(ui + j - 1, 0, ew - 1);
vs[i][j] = v_shift + av_clip(vi + i - 1, 0, eh - 1);
}
}
return 1;
}
/**
* Calculate frame position in barrel split facebook's format for corresponding 3D coordinates on sphere.
*
* @param s filter private context
* @param vec coordinates on sphere
* @param width frame width
* @param height frame height
* @param us horizontal coordinates for interpolation window
* @param vs vertical coordinates for interpolation window
* @param du horizontal relative coordinate
* @param dv vertical relative coordinate
*/
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)
{
const float phi = atan2f(vec[0], vec[2]);
const float theta = asinf(vec[1]);
const float theta_range = M_PI_4;
int ew, eh;
int u_shift, v_shift;
float uf, vf;
int ui, vi;
if (theta >= -theta_range && theta <= theta_range) {
const float scalew = s->fin_pad > 0 ? 1.f - s->fin_pad / (width * 2.f / 3.f) : 1.f - s->in_pad;
const float scaleh = s->fin_pad > 0 ? 1.f - s->fin_pad / (height / 2.f) : 1.f - s->in_pad;
ew = width / 3 * 2;
eh = height / 2;
u_shift = 0;
v_shift = phi >= M_PI_2 || phi < -M_PI_2 ? eh : 0;
uf = fmodf(phi, M_PI_2) / M_PI_2;
vf = theta / M_PI_4;
if (v_shift)
uf = uf >= 0.f ? fmodf(uf - 1.f, 1.f) : fmodf(uf + 1.f, 1.f);
uf = (uf * scalew + 1.f) * width / 3.f;
vf = (vf * scaleh + 1.f) * height / 4.f;
} else {
const float scalew = s->fin_pad > 0 ? 1.f - s->fin_pad / (width / 3.f) : 1.f - s->in_pad;
const float scaleh = s->fin_pad > 0 ? 1.f - s->fin_pad / (height / 4.f) : 1.f - s->in_pad;
ew = width / 3;
eh = height / 4;
u_shift = 2 * ew;
uf = vec[0] / vec[1] * scalew;
vf = vec[2] / vec[1] * scaleh;
if (theta <= 0.f && theta >= -M_PI_2 &&
phi <= M_PI_2 && phi >= -M_PI_2) {
// front top
uf *= -1.0f;
vf = -(vf + 1.f) * scaleh + 1.f;
v_shift = 0;
} else if (theta >= 0.f && theta <= M_PI_2 &&
phi <= M_PI_2 && phi >= -M_PI_2) {
// front bottom
vf = -(vf - 1.f) * scaleh;
v_shift = height * 0.25f;
} else if (theta <= 0.f && theta >= -M_PI_2) {
// back top
vf = (vf - 1.f) * scaleh + 1.f;
v_shift = height * 0.5f;
} else {
// back bottom
uf *= -1.0f;
vf = (vf + 1.f) * scaleh;
v_shift = height * 0.75f;
}
uf = 0.5f * width / 3.f * (uf + 1.f);
vf *= height * 0.25f;
}
ui = floorf(uf);
vi = floorf(vf);
*du = uf - ui;
*dv = vf - vi;
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
us[i][j] = u_shift + av_clip(ui + j - 1, 0, ew - 1);
vs[i][j] = v_shift + av_clip(vi + i - 1, 0, eh - 1);
}
}
return 1;
}
/**
* Calculate 3D coordinates on sphere for corresponding frame position in barrel split facebook's format.
*
* @param s filter private context
* @param i horizontal position on frame [0, width)
* @param j vertical position on frame [0, height)
* @param width frame width
* @param height frame height
* @param vec coordinates on sphere
*/
static int barrelsplit_to_xyz(const V360Context *s,
int i, int j, int width, int height,
float *vec)
{
const float x = (i + 0.5f) / width;
const float y = (j + 0.5f) / height;
float l_x, l_y, l_z;
int ret;
if (x < 2.f / 3.f) {
const float scalew = s->fout_pad > 0 ? 1.f - s->fout_pad / (width * 2.f / 3.f) : 1.f - s->out_pad;
const float scaleh = s->fout_pad > 0 ? 1.f - s->fout_pad / (height / 2.f) : 1.f - s->out_pad;
const float back = floorf(y * 2.f);
const float phi = ((3.f / 2.f * x - 0.5f) / scalew - back) * M_PI;
const float theta = (y - 0.25f - 0.5f * back) / scaleh * M_PI;
const float sin_phi = sinf(phi);
const float cos_phi = cosf(phi);
const float sin_theta = sinf(theta);
const float cos_theta = cosf(theta);
l_x = cos_theta * sin_phi;
l_y = sin_theta;
l_z = cos_theta * cos_phi;
ret = 1;
} else {
const float scalew = s->fout_pad > 0 ? 1.f - s->fout_pad / (width / 3.f) : 1.f - s->out_pad;
const float scaleh = s->fout_pad > 0 ? 1.f - s->fout_pad / (height / 4.f) : 1.f - s->out_pad;
const float facef = floorf(y * 4.f);
const int face = facef;
const float dir_vert = (face == 1 || face == 3) ? 1.0f : -1.0f;
float uf, vf;
uf = x * 3.f - 2.f;
switch (face) {
case 0: // front top
case 1: // front bottom
uf = 1.f - uf;
vf = (0.5f - 2.f * y) / scaleh + facef;
break;
case 2: // back top
case 3: // back bottom
vf = (y * 2.f - 1.5f) / scaleh + 3.f - facef;
break;
}
l_x = (0.5f - uf) / scalew;
l_y = 0.5f * dir_vert;
l_z = (vf - 0.5f) * dir_vert / scaleh;
ret = (l_x * l_x * scalew * scalew + l_z * l_z * scaleh * scaleh) < 0.5f * 0.5f;
}
vec[0] = l_x;
vec[1] = l_y;
vec[2] = l_z;
return ret;
}
/**
* Calculate 3D coordinates on sphere for corresponding frame position in tspyramid format.
*
* @param s filter private context
* @param i horizontal position on frame [0, width)
* @param j vertical position on frame [0, height)
* @param width frame width
* @param height frame height
* @param vec coordinates on sphere
*/
static int tspyramid_to_xyz(const V360Context *s,
int i, int j, int width, int height,
float *vec)
{
const float x = (i + 0.5f) / width;
const float y = (j + 0.5f) / height;
if (x < 0.5f) {
vec[0] = x * 4.f - 1.f;
vec[1] = (y * 2.f - 1.f);
vec[2] = 1.f;
} else if (x >= 0.6875f && x < 0.8125f &&
y >= 0.375f && y < 0.625f) {
vec[0] = -(x - 0.6875f) * 16.f + 1.f;
vec[1] = (y - 0.375f) * 8.f - 1.f;
vec[2] = -1.f;
} else if (0.5f <= x && x < 0.6875f &&
((0.f <= y && y < 0.375f && y >= 2.f * (x - 0.5f)) ||
(0.375f <= y && y < 0.625f) ||
(0.625f <= y && y < 1.f && y <= 2.f * (1.f - x)))) {
vec[0] = 1.f;
vec[1] = 2.f * (y - 2.f * x + 1.f) / (3.f - 4.f * x) - 1.f;
vec[2] = -2.f * (x - 0.5f) / 0.1875f + 1.f;
} else if (0.8125f <= x && x < 1.f &&
((0.f <= y && y < 0.375f && x >= (1.f - y / 2.f)) ||
(0.375f <= y && y < 0.625f) ||
(0.625f <= y && y < 1.f && y <= (2.f * x - 1.f)))) {
vec[0] = -1.f;
vec[1] = 2.f * (y + 2.f * x - 2.f) / (4.f * x - 3.f) - 1.f;
vec[2] = 2.f * (x - 0.8125f) / 0.1875f - 1.f;
} else if (0.f <= y && y < 0.375f &&
((0.5f <= x && x < 0.8125f && y < 2.f * (x - 0.5f)) ||
(0.6875f <= x && x < 0.8125f) ||
(0.8125f <= x && x < 1.f && x < (1.f - y / 2.f)))) {
vec[0] = 2.f * (1.f - x - 0.5f * y) / (0.5f - y) - 1.f;
vec[1] = -1.f;
vec[2] = 2.f * (0.375f - y) / 0.375f - 1.f;
} else {
vec[0] = 2.f * (0.5f - x + 0.5f * y) / (y - 0.5f) - 1.f;
vec[1] = 1.f;
vec[2] = -2.f * (1.f - y) / 0.375f + 1.f;
}
return 1;
}
/**
* Calculate frame position in tspyramid format for corresponding 3D coordinates on sphere.
*
* @param s filter private context
* @param vec coordinates on sphere
* @param width frame width
* @param height frame height
* @param us horizontal coordinates for interpolation window
* @param vs vertical coordinates for interpolation window
* @param du horizontal relative coordinate
* @param dv vertical relative coordinate
*/
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)
{
float uf, vf;
int ui, vi;
int face;
xyz_to_cube(s, vec, &uf, &vf, &face);
uf = (uf + 1.f) * 0.5f;
vf = (vf + 1.f) * 0.5f;
switch (face) {
case UP:
uf = 0.1875f * vf - 0.375f * uf * vf - 0.125f * uf + 0.8125f;
vf = 0.375f - 0.375f * vf;
break;
case FRONT:
uf = 0.5f * uf;
break;
case DOWN:
uf = 1.f - 0.1875f * vf - 0.5f * uf + 0.375f * uf * vf;
vf = 1.f - 0.375f * vf;
break;
case LEFT:
vf = 0.25f * vf + 0.75f * uf * vf - 0.375f * uf + 0.375f;
uf = 0.1875f * uf + 0.8125f;
break;
case RIGHT:
vf = 0.375f * uf - 0.75f * uf * vf + vf;
uf = 0.1875f * uf + 0.5f;
break;
case BACK:
uf = 0.125f * uf + 0.6875f;
vf = 0.25f * vf + 0.375f;
break;
}
uf *= width;
vf *= height;
ui = floorf(uf);
vi = floorf(vf);
*du = uf - ui;
*dv = vf - vi;
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
us[i][j] = reflectx(ui + j - 1, vi + i - 1, width, height);
vs[i][j] = reflecty(vi + i - 1, height);
}
}
return 1;
}
/**
* Calculate 3D coordinates on sphere for corresponding frame position in octahedron format.
*
* @param s filter private context
* @param i horizontal position on frame [0, width)
* @param j vertical position on frame [0, height)
* @param width frame width
* @param height frame height
* @param vec coordinates on sphere
*/
static int octahedron_to_xyz(const V360Context *s,
int i, int j, int width, int height,
float *vec)
{
const float x = rescale(i, width);
const float y = rescale(j, height);
const float ax = fabsf(x);
const float ay = fabsf(y);
vec[2] = 1.f - (ax + ay);
if (ax + ay > 1.f) {
vec[0] = (1.f - ay) * FFSIGN(x);
vec[1] = (1.f - ax) * FFSIGN(y);
} else {
vec[0] = x;
vec[1] = y;
}
return 1;
}
/**
* Calculate frame position in octahedron format for corresponding 3D coordinates on sphere.
*
* @param s filter private context
* @param vec coordinates on sphere
* @param width frame width
* @param height frame height
* @param us horizontal coordinates for interpolation window
* @param vs vertical coordinates for interpolation window
* @param du horizontal relative coordinate
* @param dv vertical relative coordinate
*/
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)
{
float uf, vf, zf;
int ui, vi;
float div = fabsf(vec[0]) + fabsf(vec[1]) + fabsf(vec[2]);
uf = vec[0] / div;
vf = vec[1] / div;
zf = vec[2];
if (zf < 0.f) {
zf = vf;
vf = (1.f - fabsf(uf)) * FFSIGN(zf);
uf = (1.f - fabsf(zf)) * FFSIGN(uf);
}
uf = scale(uf, width);
vf = scale(vf, height);
ui = floorf(uf);
vi = floorf(vf);
*du = uf - ui;
*dv = vf - vi;
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
us[i][j] = av_clip(ui + j - 1, 0, width - 1);
vs[i][j] = av_clip(vi + i - 1, 0, height - 1);
}
}
return 1;
}
static void multiply_quaternion(float c[4], const float a[4], const float b[4])
{
c[0] = a[0] * b[0] - a[1] * b[1] - a[2] * b[2] - a[3] * b[3];
c[1] = a[1] * b[0] + a[0] * b[1] + a[2] * b[3] - a[3] * b[2];
c[2] = a[2] * b[0] + a[0] * b[2] + a[3] * b[1] - a[1] * b[3];
c[3] = a[3] * b[0] + a[0] * b[3] + a[1] * b[2] - a[2] * b[1];
}
static void conjugate_quaternion(float d[4], const float q[4])
{
d[0] = q[0];
d[1] = -q[1];
d[2] = -q[2];
d[3] = -q[3];
}
/**
* Calculate rotation quaternion for yaw/pitch/roll angles.
*/
static inline void calculate_rotation(float yaw, float pitch, float roll,
float rot_quaternion[2][4],
const int rotation_order[3])
{
const float yaw_rad = yaw * M_PI / 180.f;
const float pitch_rad = pitch * M_PI / 180.f;
const float roll_rad = roll * M_PI / 180.f;
const float sin_yaw = sinf(yaw_rad * 0.5f);
const float cos_yaw = cosf(yaw_rad * 0.5f);
const float sin_pitch = sinf(pitch_rad * 0.5f);
const float cos_pitch = cosf(pitch_rad * 0.5f);
const float sin_roll = sinf(roll_rad * 0.5f);
const float cos_roll = cosf(roll_rad * 0.5f);
float m[3][4];
float tmp[2][4];
m[0][0] = cos_yaw; m[0][1] = 0.f; m[0][2] = sin_yaw; m[0][3] = 0.f;
m[1][0] = cos_pitch; m[1][1] = sin_pitch; m[1][2] = 0.f; m[1][3] = 0.f;
m[2][0] = cos_roll; m[2][1] = 0.f; m[2][2] = 0.f; m[2][3] = sin_roll;
multiply_quaternion(tmp[0], rot_quaternion[0], m[rotation_order[0]]);
multiply_quaternion(tmp[1], tmp[0], m[rotation_order[1]]);
multiply_quaternion(rot_quaternion[0], tmp[1], m[rotation_order[2]]);
conjugate_quaternion(rot_quaternion[1], rot_quaternion[0]);
}
/**
* Rotate vector with given rotation quaternion.
*
* @param rot_quaternion rotation quaternion
* @param vec vector
*/
static inline void rotate(const float rot_quaternion[2][4],
float *vec)
{
float qv[4], temp[4], rqv[4];
qv[0] = 0.f;
qv[1] = vec[0];
qv[2] = vec[1];
qv[3] = vec[2];
multiply_quaternion(temp, rot_quaternion[0], qv);
multiply_quaternion(rqv, temp, rot_quaternion[1]);
vec[0] = rqv[1];
vec[1] = rqv[2];
vec[2] = rqv[3];
}
static inline void set_mirror_modifier(int h_flip, int v_flip, int d_flip,
float *modifier)
{
modifier[0] = h_flip ? -1.f : 1.f;
modifier[1] = v_flip ? -1.f : 1.f;
modifier[2] = d_flip ? -1.f : 1.f;
}
static inline void mirror(const float *modifier, float *vec)
{
vec[0] *= modifier[0];
vec[1] *= modifier[1];
vec[2] *= modifier[2];
}
static inline void input_flip(int16_t u[4][4], int16_t v[4][4], int w, int h, int hflip, int vflip)
{
if (hflip) {
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++)
u[i][j] = w - 1 - u[i][j];
}
}
if (vflip) {
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++)
v[i][j] = h - 1 - v[i][j];
}
}
}
static int allocate_plane(V360Context *s, int sizeof_uv, int sizeof_ker, int sizeof_mask, int p)
{
const int pr_height = s->pr_height[p];
for (int n = 0; n < s->nb_threads; n++) {
SliceXYRemap *r = &s->slice_remap[n];
const int slice_start = (pr_height * n ) / s->nb_threads;
const int slice_end = (pr_height * (n + 1)) / s->nb_threads;
const int height = slice_end - slice_start;
if (!r->u[p])
r->u[p] = av_calloc(s->uv_linesize[p] * height, sizeof_uv);
if (!r->v[p])
r->v[p] = av_calloc(s->uv_linesize[p] * height, sizeof_uv);
if (!r->u[p] || !r->v[p])
return AVERROR(ENOMEM);
if (sizeof_ker) {
if (!r->ker[p])
r->ker[p] = av_calloc(s->uv_linesize[p] * height, sizeof_ker);
if (!r->ker[p])
return AVERROR(ENOMEM);
}
if (sizeof_mask && !p) {
if (!r->mask)
r->mask = av_calloc(s->pr_width[p] * height, sizeof_mask);
if (!r->mask)
return AVERROR(ENOMEM);
}
}
return 0;
}
static void fov_from_dfov(int format, float d_fov, float w, float h, float *h_fov, float *v_fov)
{
switch (format) {
case EQUIRECTANGULAR:
*h_fov = d_fov;
*v_fov = d_fov * 0.5f;
break;
case ORTHOGRAPHIC:
{
const float d = 0.5f * hypotf(w, h);
const float l = sinf(d_fov * M_PI / 360.f) / d;
*h_fov = asinf(w * 0.5f * l) * 360.f / M_PI;
*v_fov = asinf(h * 0.5f * l) * 360.f / M_PI;
if (d_fov > 180.f) {
*h_fov = 180.f - *h_fov;
*v_fov = 180.f - *v_fov;
}
}
break;
case EQUISOLID:
{
const float d = 0.5f * hypotf(w, h);
const float l = d / (sinf(d_fov * M_PI / 720.f));
*h_fov = 2.f * asinf(w * 0.5f / l) * 360.f / M_PI;
*v_fov = 2.f * asinf(h * 0.5f / l) * 360.f / M_PI;
}
break;
case STEREOGRAPHIC:
{
const float d = 0.5f * hypotf(w, h);
const float l = d / (tanf(d_fov * M_PI / 720.f));
*h_fov = 2.f * atan2f(w * 0.5f, l) * 360.f / M_PI;
*v_fov = 2.f * atan2f(h * 0.5f, l) * 360.f / M_PI;
}
break;
case DUAL_FISHEYE:
{
const float d = hypotf(w * 0.5f, h);
*h_fov = 0.5f * w / d * d_fov;
*v_fov = h / d * d_fov;
}
break;
case FISHEYE:
{
const float d = hypotf(w, h);
*h_fov = w / d * d_fov;
*v_fov = h / d * d_fov;
}
break;
case FLAT:
default:
{
const float da = tanf(0.5f * FFMIN(d_fov, 359.f) * M_PI / 180.f);
const float d = hypotf(w, h);
*h_fov = atan2f(da * w, d) * 360.f / M_PI;
*v_fov = atan2f(da * h, d) * 360.f / M_PI;
if (*h_fov < 0.f)
*h_fov += 360.f;
if (*v_fov < 0.f)
*v_fov += 360.f;
}
break;
}
}
static void set_dimensions(int *outw, int *outh, int w, int h, const AVPixFmtDescriptor *desc)
{
outw[1] = outw[2] = AV_CEIL_RSHIFT(w, desc->log2_chroma_w);
outw[0] = outw[3] = w;
outh[1] = outh[2] = AV_CEIL_RSHIFT(h, desc->log2_chroma_h);
outh[0] = outh[3] = h;
}
// Calculate remap data
static int v360_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
V360Context *s = ctx->priv;
SliceXYRemap *r = &s->slice_remap[jobnr];
for (int p = 0; p < s->nb_allocated; p++) {
const int max_value = s->max_value;
const int width = s->pr_width[p];
const int uv_linesize = s->uv_linesize[p];
const int height = s->pr_height[p];
const int in_width = s->inplanewidth[p];
const int in_height = s->inplaneheight[p];
const int slice_start = (height * jobnr ) / nb_jobs;
const int slice_end = (height * (jobnr + 1)) / nb_jobs;
const int elements = s->elements;
float du, dv;
float vec[3];
XYRemap rmap;
for (int j = slice_start; j < slice_end; j++) {
for (int i = 0; i < width; i++) {
int16_t *u = r->u[p] + ((j - slice_start) * uv_linesize + i) * elements;
int16_t *v = r->v[p] + ((j - slice_start) * uv_linesize + i) * elements;
int16_t *ker = r->ker[p] + ((j - slice_start) * uv_linesize + i) * elements;
uint8_t *mask8 = p ? NULL : r->mask + ((j - slice_start) * s->pr_width[0] + i);
uint16_t *mask16 = p ? NULL : (uint16_t *)r->mask + ((j - slice_start) * s->pr_width[0] + i);
int in_mask, out_mask;
if (s->out_transpose)
out_mask = s->out_transform(s, j, i, height, width, vec);
else
out_mask = s->out_transform(s, i, j, width, height, vec);
offset_vector(vec, s->h_offset, s->v_offset);
normalize_vector(vec);
av_assert1(!isnan(vec[0]) && !isnan(vec[1]) && !isnan(vec[2]));
rotate(s->rot_quaternion, vec);
av_assert1(!isnan(vec[0]) && !isnan(vec[1]) && !isnan(vec[2]));
normalize_vector(vec);
mirror(s->output_mirror_modifier, vec);
if (s->in_transpose)
in_mask = s->in_transform(s, vec, in_height, in_width, rmap.v, rmap.u, &du, &dv);
else
in_mask = s->in_transform(s, vec, in_width, in_height, rmap.u, rmap.v, &du, &dv);
input_flip(rmap.u, rmap.v, in_width, in_height, s->ih_flip, s->iv_flip);
av_assert1(!isnan(du) && !isnan(dv));
s->calculate_kernel(du, dv, &rmap, u, v, ker);
if (!p && r->mask) {
if (s->mask_size == 1) {
mask8[0] = 255 * (out_mask & in_mask);
} else {
mask16[0] = max_value * (out_mask & in_mask);
}
}
}
}
}
return 0;
}
static int config_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
AVFilterLink *inlink = ctx->inputs[0];
V360Context *s = ctx->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
const int depth = desc->comp[0].depth;
const int sizeof_mask = s->mask_size = (depth + 7) >> 3;
float default_h_fov = 360.f;
float default_v_fov = 180.f;
float default_ih_fov = 360.f;
float default_iv_fov = 180.f;
int sizeof_uv;
int sizeof_ker;
int err;
int h, w;
int in_offset_h, in_offset_w;
int out_offset_h, out_offset_w;
float hf, wf;
int (*prepare_out)(AVFilterContext *ctx);
int have_alpha;
s->max_value = (1 << depth) - 1;
switch (s->interp) {
case NEAREST:
s->calculate_kernel = nearest_kernel;
s->remap_slice = depth <= 8 ? remap1_8bit_slice : remap1_16bit_slice;
s->elements = 1;
sizeof_uv = sizeof(int16_t) * s->elements;
sizeof_ker = 0;
break;
case BILINEAR:
s->calculate_kernel = bilinear_kernel;
s->remap_slice = depth <= 8 ? remap2_8bit_slice : remap2_16bit_slice;
s->elements = 2 * 2;
sizeof_uv = sizeof(int16_t) * s->elements;
sizeof_ker = sizeof(int16_t) * s->elements;
break;
case LAGRANGE9:
s->calculate_kernel = lagrange_kernel;
s->remap_slice = depth <= 8 ? remap3_8bit_slice : remap3_16bit_slice;
s->elements = 3 * 3;
sizeof_uv = sizeof(int16_t) * s->elements;
sizeof_ker = sizeof(int16_t) * s->elements;
break;
case BICUBIC:
s->calculate_kernel = bicubic_kernel;
s->remap_slice = depth <= 8 ? remap4_8bit_slice : remap4_16bit_slice;
s->elements = 4 * 4;
sizeof_uv = sizeof(int16_t) * s->elements;
sizeof_ker = sizeof(int16_t) * s->elements;
break;
case LANCZOS:
s->calculate_kernel = lanczos_kernel;
s->remap_slice = depth <= 8 ? remap4_8bit_slice : remap4_16bit_slice;
s->elements = 4 * 4;
sizeof_uv = sizeof(int16_t) * s->elements;
sizeof_ker = sizeof(int16_t) * s->elements;
break;
case SPLINE16:
s->calculate_kernel = spline16_kernel;
s->remap_slice = depth <= 8 ? remap4_8bit_slice : remap4_16bit_slice;
s->elements = 4 * 4;
sizeof_uv = sizeof(int16_t) * s->elements;
sizeof_ker = sizeof(int16_t) * s->elements;
break;
case GAUSSIAN:
s->calculate_kernel = gaussian_kernel;
s->remap_slice = depth <= 8 ? remap4_8bit_slice : remap4_16bit_slice;
s->elements = 4 * 4;
sizeof_uv = sizeof(int16_t) * s->elements;
sizeof_ker = sizeof(int16_t) * s->elements;
break;
case MITCHELL:
s->calculate_kernel = mitchell_kernel;
s->remap_slice = depth <= 8 ? remap4_8bit_slice : remap4_16bit_slice;
s->elements = 4 * 4;
sizeof_uv = sizeof(int16_t) * s->elements;
sizeof_ker = sizeof(int16_t) * s->elements;
break;
default:
av_assert0(0);
}
ff_v360_init(s, depth);
for (int order = 0; order < NB_RORDERS; order++) {
const char c = s->rorder[order];
int rorder;
if (c == '\0') {
av_log(ctx, AV_LOG_WARNING,
"Incomplete rorder option. Direction for all 3 rotation orders should be specified. Switching to default rorder.\n");
s->rotation_order[0] = YAW;
s->rotation_order[1] = PITCH;
s->rotation_order[2] = ROLL;
break;
}
rorder = get_rorder(c);
if (rorder == -1) {
av_log(ctx, AV_LOG_WARNING,
"Incorrect rotation order symbol '%c' in rorder option. Switching to default rorder.\n", c);
s->rotation_order[0] = YAW;
s->rotation_order[1] = PITCH;
s->rotation_order[2] = ROLL;
break;
}
s->rotation_order[order] = rorder;
}
switch (s->in_stereo) {
case STEREO_2D:
w = inlink->w;
h = inlink->h;
in_offset_w = in_offset_h = 0;
break;
case STEREO_SBS:
w = inlink->w / 2;
h = inlink->h;
in_offset_w = w;
in_offset_h = 0;
break;
case STEREO_TB:
w = inlink->w;
h = inlink->h / 2;
in_offset_w = 0;
in_offset_h = h;
break;
default:
av_assert0(0);
}
set_dimensions(s->inplanewidth, s->inplaneheight, w, h, desc);
set_dimensions(s->in_offset_w, s->in_offset_h, in_offset_w, in_offset_h, desc);
s->in_width = s->inplanewidth[0];
s->in_height = s->inplaneheight[0];
switch (s->in) {
case CYLINDRICAL:
case FLAT:
default_ih_fov = 90.f;
default_iv_fov = 45.f;
break;
case EQUISOLID:
case ORTHOGRAPHIC:
case STEREOGRAPHIC:
case DUAL_FISHEYE:
case FISHEYE:
default_ih_fov = 180.f;
default_iv_fov = 180.f;
default:
break;
}
if (s->ih_fov == 0.f)
s->ih_fov = default_ih_fov;
if (s->iv_fov == 0.f)
s->iv_fov = default_iv_fov;
if (s->id_fov > 0.f)
fov_from_dfov(s->in, s->id_fov, w, h, &s->ih_fov, &s->iv_fov);
if (s->in_transpose)
FFSWAP(int, s->in_width, s->in_height);
switch (s->in) {
case EQUIRECTANGULAR:
s->in_transform = xyz_to_equirect;
err = prepare_equirect_in(ctx);
wf = w;
hf = h;
break;
case CUBEMAP_3_2:
s->in_transform = xyz_to_cube3x2;
err = prepare_cube_in(ctx);
wf = w / 3.f * 4.f;
hf = h;
break;
case CUBEMAP_1_6:
s->in_transform = xyz_to_cube1x6;
err = prepare_cube_in(ctx);
wf = w * 4.f;
hf = h / 3.f;
break;
case CUBEMAP_6_1:
s->in_transform = xyz_to_cube6x1;
err = prepare_cube_in(ctx);
wf = w / 3.f * 2.f;
hf = h * 2.f;
break;
case EQUIANGULAR:
s->in_transform = xyz_to_eac;
err = prepare_eac_in(ctx);
wf = w;
hf = h / 9.f * 8.f;
break;
case FLAT:
s->in_transform = xyz_to_flat;
err = prepare_flat_in(ctx);
wf = w;
hf = h;
break;
case PERSPECTIVE:
av_log(ctx, AV_LOG_ERROR, "Supplied format is not accepted as input.\n");
return AVERROR(EINVAL);
case DUAL_FISHEYE:
s->in_transform = xyz_to_dfisheye;
err = prepare_dfisheye_in(ctx);
wf = w;
hf = h;
break;
case BARREL:
s->in_transform = xyz_to_barrel;
err = 0;
wf = w / 5.f * 4.f;
hf = h;
break;
case STEREOGRAPHIC:
s->in_transform = xyz_to_stereographic;
err = prepare_stereographic_in(ctx);
wf = w;
hf = h / 2.f;
break;
case MERCATOR:
s->in_transform = xyz_to_mercator;
err = 0;
wf = w;
hf = h / 2.f;
break;
case BALL:
s->in_transform = xyz_to_ball;
err = 0;
wf = w;
hf = h / 2.f;
break;
case HAMMER:
s->in_transform = xyz_to_hammer;
err = 0;
wf = w;
hf = h;
break;
case SINUSOIDAL:
s->in_transform = xyz_to_sinusoidal;
err = 0;
wf = w;
hf = h;
break;
case FISHEYE:
s->in_transform = xyz_to_fisheye;
err = prepare_fisheye_in(ctx);
wf = w * 2;
hf = h;
break;
case PANNINI:
s->in_transform = xyz_to_pannini;
err = 0;
wf = w;
hf = h;
break;
case CYLINDRICAL:
s->in_transform = xyz_to_cylindrical;
err = prepare_cylindrical_in(ctx);
wf = w;
hf = h * 2.f;
break;
case CYLINDRICALEA:
s->in_transform = xyz_to_cylindricalea;
err = prepare_cylindricalea_in(ctx);
wf = w;
hf = h;
break;
case TETRAHEDRON:
s->in_transform = xyz_to_tetrahedron;
err = 0;
wf = w;
hf = h;
break;
case BARREL_SPLIT:
s->in_transform = xyz_to_barrelsplit;
err = 0;
wf = w * 4.f / 3.f;
hf = h;
break;
case TSPYRAMID:
s->in_transform = xyz_to_tspyramid;
err = 0;
wf = w;
hf = h;
break;
case HEQUIRECTANGULAR:
s->in_transform = xyz_to_hequirect;
err = 0;
wf = w * 2.f;
hf = h;
break;
case EQUISOLID:
s->in_transform = xyz_to_equisolid;
err = prepare_equisolid_in(ctx);
wf = w;
hf = h / 2.f;
break;
case ORTHOGRAPHIC:
s->in_transform = xyz_to_orthographic;
err = prepare_orthographic_in(ctx);
wf = w;
hf = h / 2.f;
break;
case OCTAHEDRON:
s->in_transform = xyz_to_octahedron;
err = 0;
wf = w;
hf = h / 2.f;
break;
default:
av_log(ctx, AV_LOG_ERROR, "Specified input format is not handled.\n");
return AVERROR_BUG;
}
if (err != 0) {
return err;
}
switch (s->out) {
case EQUIRECTANGULAR:
s->out_transform = equirect_to_xyz;
prepare_out = prepare_equirect_out;
w = lrintf(wf);
h = lrintf(hf);
break;
case CUBEMAP_3_2:
s->out_transform = cube3x2_to_xyz;
prepare_out = prepare_cube_out;
w = lrintf(wf / 4.f * 3.f);
h = lrintf(hf);
break;
case CUBEMAP_1_6:
s->out_transform = cube1x6_to_xyz;
prepare_out = prepare_cube_out;
w = lrintf(wf / 4.f);
h = lrintf(hf * 3.f);
break;
case CUBEMAP_6_1:
s->out_transform = cube6x1_to_xyz;
prepare_out = prepare_cube_out;
w = lrintf(wf / 2.f * 3.f);
h = lrintf(hf / 2.f);
break;
case EQUIANGULAR:
s->out_transform = eac_to_xyz;
prepare_out = prepare_eac_out;
w = lrintf(wf);
h = lrintf(hf / 8.f * 9.f);
break;
case FLAT:
s->out_transform = flat_to_xyz;
prepare_out = prepare_flat_out;
w = lrintf(wf);
h = lrintf(hf);
break;
case DUAL_FISHEYE:
s->out_transform = dfisheye_to_xyz;
prepare_out = prepare_fisheye_out;
w = lrintf(wf);
h = lrintf(hf);
break;
case BARREL:
s->out_transform = barrel_to_xyz;
prepare_out = NULL;
w = lrintf(wf / 4.f * 5.f);
h = lrintf(hf);
break;
case STEREOGRAPHIC:
s->out_transform = stereographic_to_xyz;
prepare_out = prepare_stereographic_out;
w = lrintf(wf);
h = lrintf(hf * 2.f);
break;
case MERCATOR:
s->out_transform = mercator_to_xyz;
prepare_out = NULL;
w = lrintf(wf);
h = lrintf(hf * 2.f);
break;
case BALL:
s->out_transform = ball_to_xyz;
prepare_out = NULL;
w = lrintf(wf);
h = lrintf(hf * 2.f);
break;
case HAMMER:
s->out_transform = hammer_to_xyz;
prepare_out = NULL;
w = lrintf(wf);
h = lrintf(hf);
break;
case SINUSOIDAL:
s->out_transform = sinusoidal_to_xyz;
prepare_out = NULL;
w = lrintf(wf);
h = lrintf(hf);
break;
case FISHEYE:
s->out_transform = fisheye_to_xyz;
prepare_out = prepare_fisheye_out;
w = lrintf(wf * 0.5f);
h = lrintf(hf);
break;
case PANNINI:
s->out_transform = pannini_to_xyz;
prepare_out = NULL;
w = lrintf(wf);
h = lrintf(hf);
break;
case CYLINDRICAL:
s->out_transform = cylindrical_to_xyz;
prepare_out = prepare_cylindrical_out;
w = lrintf(wf);
h = lrintf(hf * 0.5f);
break;
case CYLINDRICALEA:
s->out_transform = cylindricalea_to_xyz;
prepare_out = prepare_cylindricalea_out;
w = lrintf(wf);
h = lrintf(hf);
break;
case PERSPECTIVE:
s->out_transform = perspective_to_xyz;
prepare_out = NULL;
w = lrintf(wf / 2.f);
h = lrintf(hf);
break;
case TETRAHEDRON:
s->out_transform = tetrahedron_to_xyz;
prepare_out = NULL;
w = lrintf(wf);
h = lrintf(hf);
break;
case BARREL_SPLIT:
s->out_transform = barrelsplit_to_xyz;
prepare_out = NULL;
w = lrintf(wf / 4.f * 3.f);
h = lrintf(hf);
break;
case TSPYRAMID:
s->out_transform = tspyramid_to_xyz;
prepare_out = NULL;
w = lrintf(wf);
h = lrintf(hf);
break;
case HEQUIRECTANGULAR:
s->out_transform = hequirect_to_xyz;
prepare_out = NULL;
w = lrintf(wf / 2.f);
h = lrintf(hf);
break;
case EQUISOLID:
s->out_transform = equisolid_to_xyz;
prepare_out = prepare_equisolid_out;
w = lrintf(wf);
h = lrintf(hf * 2.f);
break;
case ORTHOGRAPHIC:
s->out_transform = orthographic_to_xyz;
prepare_out = prepare_orthographic_out;
w = lrintf(wf);
h = lrintf(hf * 2.f);
break;
case OCTAHEDRON:
s->out_transform = octahedron_to_xyz;
prepare_out = NULL;
w = lrintf(wf);
h = lrintf(hf * 2.f);
break;
default:
av_log(ctx, AV_LOG_ERROR, "Specified output format is not handled.\n");
return AVERROR_BUG;
}
// Override resolution with user values if specified
if (s->width > 0 && s->height <= 0 && s->h_fov > 0.f && s->v_fov > 0.f &&
s->out == FLAT && s->d_fov == 0.f) {
w = s->width;
h = w / tanf(s->h_fov * M_PI / 360.f) * tanf(s->v_fov * M_PI / 360.f);
} else if (s->width <= 0 && s->height > 0 && s->h_fov > 0.f && s->v_fov > 0.f &&
s->out == FLAT && s->d_fov == 0.f) {
h = s->height;
w = h / tanf(s->v_fov * M_PI / 360.f) * tanf(s->h_fov * M_PI / 360.f);
} else if (s->width > 0 && s->height > 0) {
w = s->width;
h = s->height;
} else if (s->width > 0 || s->height > 0) {
av_log(ctx, AV_LOG_ERROR, "Both width and height values should be specified.\n");
return AVERROR(EINVAL);
} else {
if (s->out_transpose)
FFSWAP(int, w, h);
if (s->in_transpose)
FFSWAP(int, w, h);
}
s->width = w;
s->height = h;
switch (s->out) {
case CYLINDRICAL:
case FLAT:
default_h_fov = 90.f;
default_v_fov = 45.f;
break;
case EQUISOLID:
case ORTHOGRAPHIC:
case STEREOGRAPHIC:
case DUAL_FISHEYE:
case FISHEYE:
default_h_fov = 180.f;
default_v_fov = 180.f;
break;
default:
break;
}
if (s->h_fov == 0.f)
s->h_fov = default_h_fov;
if (s->v_fov == 0.f)
s->v_fov = default_v_fov;
if (s->d_fov > 0.f)
fov_from_dfov(s->out, s->d_fov, w, h, &s->h_fov, &s->v_fov);
if (prepare_out) {
err = prepare_out(ctx);
if (err != 0)
return err;
}
set_dimensions(s->pr_width, s->pr_height, w, h, desc);
switch (s->out_stereo) {
case STEREO_2D:
out_offset_w = out_offset_h = 0;
break;
case STEREO_SBS:
out_offset_w = w;
out_offset_h = 0;
w *= 2;
break;
case STEREO_TB:
out_offset_w = 0;
out_offset_h = h;
h *= 2;
break;
default:
av_assert0(0);
}
set_dimensions(s->out_offset_w, s->out_offset_h, out_offset_w, out_offset_h, desc);
set_dimensions(s->planewidth, s->planeheight, w, h, desc);
for (int i = 0; i < 4; i++)
s->uv_linesize[i] = FFALIGN(s->pr_width[i], 8);
outlink->h = h;
outlink->w = w;
s->nb_threads = FFMIN(outlink->h, ff_filter_get_nb_threads(ctx));
s->nb_planes = av_pix_fmt_count_planes(inlink->format);
have_alpha = !!(desc->flags & AV_PIX_FMT_FLAG_ALPHA);
if (desc->log2_chroma_h == desc->log2_chroma_w && desc->log2_chroma_h == 0) {
s->nb_allocated = 1;
s->map[0] = s->map[1] = s->map[2] = s->map[3] = 0;
} else {
s->nb_allocated = 2;
s->map[0] = s->map[3] = 0;
s->map[1] = s->map[2] = 1;
}
if (!s->slice_remap)
s->slice_remap = av_calloc(s->nb_threads, sizeof(*s->slice_remap));
if (!s->slice_remap)
return AVERROR(ENOMEM);
for (int i = 0; i < s->nb_allocated; i++) {
err = allocate_plane(s, sizeof_uv, sizeof_ker, sizeof_mask * have_alpha * s->alpha, i);
if (err < 0)
return err;
}
calculate_rotation(s->yaw, s->pitch, s->roll,
s->rot_quaternion, s->rotation_order);
set_mirror_modifier(s->h_flip, s->v_flip, s->d_flip, s->output_mirror_modifier);
ff_filter_execute(ctx, v360_slice, NULL, NULL, s->nb_threads);
return 0;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
AVFilterLink *outlink = ctx->outputs[0];
V360Context *s = ctx->priv;
AVFrame *out;
ThreadData td;
out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!out) {
av_frame_free(&in);
return AVERROR(ENOMEM);
}
av_frame_copy_props(out, in);
td.in = in;
td.out = out;
ff_filter_execute(ctx, s->remap_slice, &td, NULL, s->nb_threads);
av_frame_free(&in);
return ff_filter_frame(outlink, out);
}
static void reset_rot(V360Context *s)
{
s->rot_quaternion[0][0] = 1.f;
s->rot_quaternion[0][1] = s->rot_quaternion[0][2] = s->rot_quaternion[0][3] = 0.f;
}
static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
char *res, int res_len, int flags)
{
V360Context *s = ctx->priv;
int ret;
if (s->reset_rot <= 0)
s->yaw = s->pitch = s->roll = 0.f;
if (s->reset_rot < 0)
s->reset_rot = 0;
ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags);
if (ret < 0)
return ret;
if (s->reset_rot)
reset_rot(s);
return config_output(ctx->outputs[0]);
}
static av_cold int init(AVFilterContext *ctx)
{
V360Context *s = ctx->priv;
reset_rot(s);
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
V360Context *s = ctx->priv;
for (int n = 0; n < s->nb_threads && s->slice_remap; n++) {
SliceXYRemap *r = &s->slice_remap[n];
for (int p = 0; p < s->nb_allocated; p++) {
av_freep(&r->u[p]);
av_freep(&r->v[p]);
av_freep(&r->ker[p]);
}
av_freep(&r->mask);
}
av_freep(&s->slice_remap);
}
static const AVFilterPad inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
},
};
static const AVFilterPad outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_output,
},
};
const AVFilter ff_vf_v360 = {
.name = "v360",
.description = NULL_IF_CONFIG_SMALL("Convert 360 projection of video."),
.priv_size = sizeof(V360Context),
.init = init,
.uninit = uninit,
FILTER_INPUTS(inputs),
FILTER_OUTPUTS(outputs),
FILTER_QUERY_FUNC(query_formats),
.priv_class = &v360_class,
.flags = AVFILTER_FLAG_SLICE_THREADS,
.process_command = process_command,
};
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