2 * Copyright (c) 2019 Eugene Lyapustin
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 * 360 video conversion filter.
24 * Principle of operation:
26 * (for each pixel in output frame)
27 * 1) Calculate OpenGL-like coordinates (x, y, z) for pixel position (i, j)
28 * 2) Apply 360 operations (rotation, mirror) to (x, y, z)
29 * 3) Calculate pixel position (u, v) in input frame
30 * 4) Calculate interpolation window and weight for each pixel
33 * 5) Remap input frame to output frame using precalculated data
38 #include "libavutil/avassert.h"
39 #include "libavutil/imgutils.h"
40 #include "libavutil/pixdesc.h"
41 #include "libavutil/opt.h"
48 typedef struct ThreadData {
53 #define OFFSET(x) offsetof(V360Context, x)
54 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
55 #define TFLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
57 static const AVOption v360_options[] = {
58 { "input", "set input projection", OFFSET(in), AV_OPT_TYPE_INT, {.i64=EQUIRECTANGULAR}, 0, NB_PROJECTIONS-1, FLAGS, "in" },
59 { "e", "equirectangular", 0, AV_OPT_TYPE_CONST, {.i64=EQUIRECTANGULAR}, 0, 0, FLAGS, "in" },
60 { "equirect", "equirectangular", 0, AV_OPT_TYPE_CONST, {.i64=EQUIRECTANGULAR}, 0, 0, FLAGS, "in" },
61 { "c3x2", "cubemap 3x2", 0, AV_OPT_TYPE_CONST, {.i64=CUBEMAP_3_2}, 0, 0, FLAGS, "in" },
62 { "c6x1", "cubemap 6x1", 0, AV_OPT_TYPE_CONST, {.i64=CUBEMAP_6_1}, 0, 0, FLAGS, "in" },
63 { "eac", "equi-angular cubemap", 0, AV_OPT_TYPE_CONST, {.i64=EQUIANGULAR}, 0, 0, FLAGS, "in" },
64 { "dfisheye", "dual fisheye", 0, AV_OPT_TYPE_CONST, {.i64=DUAL_FISHEYE}, 0, 0, FLAGS, "in" },
65 { "flat", "regular video", 0, AV_OPT_TYPE_CONST, {.i64=FLAT}, 0, 0, FLAGS, "in" },
66 {"rectilinear", "regular video", 0, AV_OPT_TYPE_CONST, {.i64=FLAT}, 0, 0, FLAGS, "in" },
67 { "gnomonic", "regular video", 0, AV_OPT_TYPE_CONST, {.i64=FLAT}, 0, 0, FLAGS, "in" },
68 { "barrel", "barrel facebook's 360 format", 0, AV_OPT_TYPE_CONST, {.i64=BARREL}, 0, 0, FLAGS, "in" },
69 { "fb", "barrel facebook's 360 format", 0, AV_OPT_TYPE_CONST, {.i64=BARREL}, 0, 0, FLAGS, "in" },
70 { "c1x6", "cubemap 1x6", 0, AV_OPT_TYPE_CONST, {.i64=CUBEMAP_1_6}, 0, 0, FLAGS, "in" },
71 { "sg", "stereographic", 0, AV_OPT_TYPE_CONST, {.i64=STEREOGRAPHIC}, 0, 0, FLAGS, "in" },
72 { "mercator", "mercator", 0, AV_OPT_TYPE_CONST, {.i64=MERCATOR}, 0, 0, FLAGS, "in" },
73 { "ball", "ball", 0, AV_OPT_TYPE_CONST, {.i64=BALL}, 0, 0, FLAGS, "in" },
74 { "hammer", "hammer", 0, AV_OPT_TYPE_CONST, {.i64=HAMMER}, 0, 0, FLAGS, "in" },
75 {"sinusoidal", "sinusoidal", 0, AV_OPT_TYPE_CONST, {.i64=SINUSOIDAL}, 0, 0, FLAGS, "in" },
76 { "fisheye", "fisheye", 0, AV_OPT_TYPE_CONST, {.i64=FISHEYE}, 0, 0, FLAGS, "in" },
77 { "pannini", "pannini", 0, AV_OPT_TYPE_CONST, {.i64=PANNINI}, 0, 0, FLAGS, "in" },
78 {"cylindrical", "cylindrical", 0, AV_OPT_TYPE_CONST, {.i64=CYLINDRICAL}, 0, 0, FLAGS, "in" },
79 {"tetrahedron", "tetrahedron", 0, AV_OPT_TYPE_CONST, {.i64=TETRAHEDRON}, 0, 0, FLAGS, "in" },
80 {"barrelsplit", "barrel split facebook's 360 format", 0, AV_OPT_TYPE_CONST, {.i64=BARREL_SPLIT}, 0, 0, FLAGS, "in" },
81 { "tsp", "truncated square pyramid", 0, AV_OPT_TYPE_CONST, {.i64=TSPYRAMID}, 0, 0, FLAGS, "in" },
82 { "hequirect", "half equirectangular", 0, AV_OPT_TYPE_CONST, {.i64=HEQUIRECTANGULAR},0, 0, FLAGS, "in" },
83 { "he", "half equirectangular", 0, AV_OPT_TYPE_CONST, {.i64=HEQUIRECTANGULAR},0, 0, FLAGS, "in" },
84 { "output", "set output projection", OFFSET(out), AV_OPT_TYPE_INT, {.i64=CUBEMAP_3_2}, 0, NB_PROJECTIONS-1, FLAGS, "out" },
85 { "e", "equirectangular", 0, AV_OPT_TYPE_CONST, {.i64=EQUIRECTANGULAR}, 0, 0, FLAGS, "out" },
86 { "equirect", "equirectangular", 0, AV_OPT_TYPE_CONST, {.i64=EQUIRECTANGULAR}, 0, 0, FLAGS, "out" },
87 { "c3x2", "cubemap 3x2", 0, AV_OPT_TYPE_CONST, {.i64=CUBEMAP_3_2}, 0, 0, FLAGS, "out" },
88 { "c6x1", "cubemap 6x1", 0, AV_OPT_TYPE_CONST, {.i64=CUBEMAP_6_1}, 0, 0, FLAGS, "out" },
89 { "eac", "equi-angular cubemap", 0, AV_OPT_TYPE_CONST, {.i64=EQUIANGULAR}, 0, 0, FLAGS, "out" },
90 { "dfisheye", "dual fisheye", 0, AV_OPT_TYPE_CONST, {.i64=DUAL_FISHEYE}, 0, 0, FLAGS, "out" },
91 { "flat", "regular video", 0, AV_OPT_TYPE_CONST, {.i64=FLAT}, 0, 0, FLAGS, "out" },
92 {"rectilinear", "regular video", 0, AV_OPT_TYPE_CONST, {.i64=FLAT}, 0, 0, FLAGS, "out" },
93 { "gnomonic", "regular video", 0, AV_OPT_TYPE_CONST, {.i64=FLAT}, 0, 0, FLAGS, "out" },
94 { "barrel", "barrel facebook's 360 format", 0, AV_OPT_TYPE_CONST, {.i64=BARREL}, 0, 0, FLAGS, "out" },
95 { "fb", "barrel facebook's 360 format", 0, AV_OPT_TYPE_CONST, {.i64=BARREL}, 0, 0, FLAGS, "out" },
96 { "c1x6", "cubemap 1x6", 0, AV_OPT_TYPE_CONST, {.i64=CUBEMAP_1_6}, 0, 0, FLAGS, "out" },
97 { "sg", "stereographic", 0, AV_OPT_TYPE_CONST, {.i64=STEREOGRAPHIC}, 0, 0, FLAGS, "out" },
98 { "mercator", "mercator", 0, AV_OPT_TYPE_CONST, {.i64=MERCATOR}, 0, 0, FLAGS, "out" },
99 { "ball", "ball", 0, AV_OPT_TYPE_CONST, {.i64=BALL}, 0, 0, FLAGS, "out" },
100 { "hammer", "hammer", 0, AV_OPT_TYPE_CONST, {.i64=HAMMER}, 0, 0, FLAGS, "out" },
101 {"sinusoidal", "sinusoidal", 0, AV_OPT_TYPE_CONST, {.i64=SINUSOIDAL}, 0, 0, FLAGS, "out" },
102 { "fisheye", "fisheye", 0, AV_OPT_TYPE_CONST, {.i64=FISHEYE}, 0, 0, FLAGS, "out" },
103 { "pannini", "pannini", 0, AV_OPT_TYPE_CONST, {.i64=PANNINI}, 0, 0, FLAGS, "out" },
104 {"cylindrical", "cylindrical", 0, AV_OPT_TYPE_CONST, {.i64=CYLINDRICAL}, 0, 0, FLAGS, "out" },
105 {"perspective", "perspective", 0, AV_OPT_TYPE_CONST, {.i64=PERSPECTIVE}, 0, 0, FLAGS, "out" },
106 {"tetrahedron", "tetrahedron", 0, AV_OPT_TYPE_CONST, {.i64=TETRAHEDRON}, 0, 0, FLAGS, "out" },
107 {"barrelsplit", "barrel split facebook's 360 format", 0, AV_OPT_TYPE_CONST, {.i64=BARREL_SPLIT}, 0, 0, FLAGS, "out" },
108 { "tsp", "truncated square pyramid", 0, AV_OPT_TYPE_CONST, {.i64=TSPYRAMID}, 0, 0, FLAGS, "out" },
109 { "hequirect", "half equirectangular", 0, AV_OPT_TYPE_CONST, {.i64=HEQUIRECTANGULAR},0, 0, FLAGS, "out" },
110 { "he", "half equirectangular", 0, AV_OPT_TYPE_CONST, {.i64=HEQUIRECTANGULAR},0, 0, FLAGS, "out" },
111 { "interp", "set interpolation method", OFFSET(interp), AV_OPT_TYPE_INT, {.i64=BILINEAR}, 0, NB_INTERP_METHODS-1, FLAGS, "interp" },
112 { "near", "nearest neighbour", 0, AV_OPT_TYPE_CONST, {.i64=NEAREST}, 0, 0, FLAGS, "interp" },
113 { "nearest", "nearest neighbour", 0, AV_OPT_TYPE_CONST, {.i64=NEAREST}, 0, 0, FLAGS, "interp" },
114 { "line", "bilinear interpolation", 0, AV_OPT_TYPE_CONST, {.i64=BILINEAR}, 0, 0, FLAGS, "interp" },
115 { "linear", "bilinear interpolation", 0, AV_OPT_TYPE_CONST, {.i64=BILINEAR}, 0, 0, FLAGS, "interp" },
116 { "lagrange9", "lagrange9 interpolation", 0, AV_OPT_TYPE_CONST, {.i64=LAGRANGE9}, 0, 0, FLAGS, "interp" },
117 { "cube", "bicubic interpolation", 0, AV_OPT_TYPE_CONST, {.i64=BICUBIC}, 0, 0, FLAGS, "interp" },
118 { "cubic", "bicubic interpolation", 0, AV_OPT_TYPE_CONST, {.i64=BICUBIC}, 0, 0, FLAGS, "interp" },
119 { "lanc", "lanczos interpolation", 0, AV_OPT_TYPE_CONST, {.i64=LANCZOS}, 0, 0, FLAGS, "interp" },
120 { "lanczos", "lanczos interpolation", 0, AV_OPT_TYPE_CONST, {.i64=LANCZOS}, 0, 0, FLAGS, "interp" },
121 { "sp16", "spline16 interpolation", 0, AV_OPT_TYPE_CONST, {.i64=SPLINE16}, 0, 0, FLAGS, "interp" },
122 { "spline16", "spline16 interpolation", 0, AV_OPT_TYPE_CONST, {.i64=SPLINE16}, 0, 0, FLAGS, "interp" },
123 { "gauss", "gaussian interpolation", 0, AV_OPT_TYPE_CONST, {.i64=GAUSSIAN}, 0, 0, FLAGS, "interp" },
124 { "gaussian", "gaussian interpolation", 0, AV_OPT_TYPE_CONST, {.i64=GAUSSIAN}, 0, 0, FLAGS, "interp" },
125 { "w", "output width", OFFSET(width), AV_OPT_TYPE_INT, {.i64=0}, 0, INT16_MAX, FLAGS, "w"},
126 { "h", "output height", OFFSET(height), AV_OPT_TYPE_INT, {.i64=0}, 0, INT16_MAX, FLAGS, "h"},
127 { "in_stereo", "input stereo format", OFFSET(in_stereo), AV_OPT_TYPE_INT, {.i64=STEREO_2D}, 0, NB_STEREO_FMTS-1, FLAGS, "stereo" },
128 {"out_stereo", "output stereo format", OFFSET(out_stereo), AV_OPT_TYPE_INT, {.i64=STEREO_2D}, 0, NB_STEREO_FMTS-1, FLAGS, "stereo" },
129 { "2d", "2d mono", 0, AV_OPT_TYPE_CONST, {.i64=STEREO_2D}, 0, 0, FLAGS, "stereo" },
130 { "sbs", "side by side", 0, AV_OPT_TYPE_CONST, {.i64=STEREO_SBS}, 0, 0, FLAGS, "stereo" },
131 { "tb", "top bottom", 0, AV_OPT_TYPE_CONST, {.i64=STEREO_TB}, 0, 0, FLAGS, "stereo" },
132 { "in_forder", "input cubemap face order", OFFSET(in_forder), AV_OPT_TYPE_STRING, {.str="rludfb"}, 0, NB_DIRECTIONS-1, FLAGS, "in_forder"},
133 {"out_forder", "output cubemap face order", OFFSET(out_forder), AV_OPT_TYPE_STRING, {.str="rludfb"}, 0, NB_DIRECTIONS-1, FLAGS, "out_forder"},
134 { "in_frot", "input cubemap face rotation", OFFSET(in_frot), AV_OPT_TYPE_STRING, {.str="000000"}, 0, NB_DIRECTIONS-1, FLAGS, "in_frot"},
135 { "out_frot", "output cubemap face rotation",OFFSET(out_frot), AV_OPT_TYPE_STRING, {.str="000000"}, 0, NB_DIRECTIONS-1, FLAGS, "out_frot"},
136 { "in_pad", "percent input cubemap pads", OFFSET(in_pad), AV_OPT_TYPE_FLOAT, {.dbl=0.f}, 0.f, 1.f,TFLAGS, "in_pad"},
137 { "out_pad", "percent output cubemap pads", OFFSET(out_pad), AV_OPT_TYPE_FLOAT, {.dbl=0.f}, 0.f, 1.f,TFLAGS, "out_pad"},
138 { "fin_pad", "fixed input cubemap pads", OFFSET(fin_pad), AV_OPT_TYPE_INT, {.i64=0}, 0, 100,TFLAGS, "fin_pad"},
139 { "fout_pad", "fixed output cubemap pads", OFFSET(fout_pad), AV_OPT_TYPE_INT, {.i64=0}, 0, 100,TFLAGS, "fout_pad"},
140 { "yaw", "yaw rotation", OFFSET(yaw), AV_OPT_TYPE_FLOAT, {.dbl=0.f}, -180.f, 180.f,TFLAGS, "yaw"},
141 { "pitch", "pitch rotation", OFFSET(pitch), AV_OPT_TYPE_FLOAT, {.dbl=0.f}, -180.f, 180.f,TFLAGS, "pitch"},
142 { "roll", "roll rotation", OFFSET(roll), AV_OPT_TYPE_FLOAT, {.dbl=0.f}, -180.f, 180.f,TFLAGS, "roll"},
143 { "rorder", "rotation order", OFFSET(rorder), AV_OPT_TYPE_STRING, {.str="ypr"}, 0, 0,TFLAGS, "rorder"},
144 { "h_fov", "output horizontal field of view",OFFSET(h_fov), AV_OPT_TYPE_FLOAT, {.dbl=90.f}, 0.00001f, 360.f,TFLAGS, "h_fov"},
145 { "v_fov", "output vertical field of view", OFFSET(v_fov), AV_OPT_TYPE_FLOAT, {.dbl=45.f}, 0.00001f, 360.f,TFLAGS, "v_fov"},
146 { "d_fov", "output diagonal field of view", OFFSET(d_fov), AV_OPT_TYPE_FLOAT, {.dbl=0.f}, 0.f, 360.f,TFLAGS, "d_fov"},
147 { "h_flip", "flip out video horizontally", OFFSET(h_flip), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1,TFLAGS, "h_flip"},
148 { "v_flip", "flip out video vertically", OFFSET(v_flip), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1,TFLAGS, "v_flip"},
149 { "d_flip", "flip out video indepth", OFFSET(d_flip), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1,TFLAGS, "d_flip"},
150 { "ih_flip", "flip in video horizontally", OFFSET(ih_flip), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1,TFLAGS, "ih_flip"},
151 { "iv_flip", "flip in video vertically", OFFSET(iv_flip), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1,TFLAGS, "iv_flip"},
152 { "in_trans", "transpose video input", OFFSET(in_transpose), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS, "in_transpose"},
153 { "out_trans", "transpose video output", OFFSET(out_transpose), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS, "out_transpose"},
154 { "ih_fov", "input horizontal field of view",OFFSET(ih_fov), AV_OPT_TYPE_FLOAT, {.dbl=90.f}, 0.00001f, 360.f,TFLAGS, "ih_fov"},
155 { "iv_fov", "input vertical field of view", OFFSET(iv_fov), AV_OPT_TYPE_FLOAT, {.dbl=45.f}, 0.00001f, 360.f,TFLAGS, "iv_fov"},
156 { "id_fov", "input diagonal field of view", OFFSET(id_fov), AV_OPT_TYPE_FLOAT, {.dbl=0.f}, 0.f, 360.f,TFLAGS, "id_fov"},
157 {"alpha_mask", "build mask in alpha plane", OFFSET(alpha), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS, "alpha"},
161 AVFILTER_DEFINE_CLASS(v360);
163 static int query_formats(AVFilterContext *ctx)
165 V360Context *s = ctx->priv;
166 static const enum AVPixelFormat pix_fmts[] = {
168 AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA444P9,
169 AV_PIX_FMT_YUVA444P10, AV_PIX_FMT_YUVA444P12,
170 AV_PIX_FMT_YUVA444P16,
173 AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA422P9,
174 AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA422P12,
175 AV_PIX_FMT_YUVA422P16,
178 AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA420P9,
179 AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA420P16,
182 AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,
183 AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
187 AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV444P9,
188 AV_PIX_FMT_YUV444P10, AV_PIX_FMT_YUV444P12,
189 AV_PIX_FMT_YUV444P14, AV_PIX_FMT_YUV444P16,
192 AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV440P10,
193 AV_PIX_FMT_YUV440P12,
196 AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV422P9,
197 AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV422P12,
198 AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV422P16,
201 AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV420P9,
202 AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV420P12,
203 AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV420P16,
212 AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRP9,
213 AV_PIX_FMT_GBRP10, AV_PIX_FMT_GBRP12,
214 AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,
217 AV_PIX_FMT_GBRAP, AV_PIX_FMT_GBRAP10,
218 AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRAP16,
221 AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY9,
222 AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12,
223 AV_PIX_FMT_GRAY14, AV_PIX_FMT_GRAY16,
227 static const enum AVPixelFormat alpha_pix_fmts[] = {
228 AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA444P9,
229 AV_PIX_FMT_YUVA444P10, AV_PIX_FMT_YUVA444P12,
230 AV_PIX_FMT_YUVA444P16,
231 AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA422P9,
232 AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA422P12,
233 AV_PIX_FMT_YUVA422P16,
234 AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA420P9,
235 AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA420P16,
236 AV_PIX_FMT_GBRAP, AV_PIX_FMT_GBRAP10,
237 AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRAP16,
241 AVFilterFormats *fmts_list = ff_make_format_list(s->alpha ? alpha_pix_fmts : pix_fmts);
243 return AVERROR(ENOMEM);
244 return ff_set_common_formats(ctx, fmts_list);
247 #define DEFINE_REMAP1_LINE(bits, div) \
248 static void remap1_##bits##bit_line_c(uint8_t *dst, int width, const uint8_t *const src, \
249 ptrdiff_t in_linesize, \
250 const int16_t *const u, const int16_t *const v, \
251 const int16_t *const ker) \
253 const uint##bits##_t *const s = (const uint##bits##_t *const)src; \
254 uint##bits##_t *d = (uint##bits##_t *)dst; \
256 in_linesize /= div; \
258 for (int x = 0; x < width; x++) \
259 d[x] = s[v[x] * in_linesize + u[x]]; \
262 DEFINE_REMAP1_LINE( 8, 1)
263 DEFINE_REMAP1_LINE(16, 2)
266 * Generate remapping function with a given window size and pixel depth.
268 * @param ws size of interpolation window
269 * @param bits number of bits per pixel
271 #define DEFINE_REMAP(ws, bits) \
272 static int remap##ws##_##bits##bit_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs) \
274 ThreadData *td = arg; \
275 const V360Context *s = ctx->priv; \
276 const AVFrame *in = td->in; \
277 AVFrame *out = td->out; \
279 for (int stereo = 0; stereo < 1 + s->out_stereo > STEREO_2D; stereo++) { \
280 for (int plane = 0; plane < s->nb_planes; plane++) { \
281 const unsigned map = s->map[plane]; \
282 const int in_linesize = in->linesize[plane]; \
283 const int out_linesize = out->linesize[plane]; \
284 const int uv_linesize = s->uv_linesize[plane]; \
285 const int in_offset_w = stereo ? s->in_offset_w[plane] : 0; \
286 const int in_offset_h = stereo ? s->in_offset_h[plane] : 0; \
287 const int out_offset_w = stereo ? s->out_offset_w[plane] : 0; \
288 const int out_offset_h = stereo ? s->out_offset_h[plane] : 0; \
289 const uint8_t *const src = in->data[plane] + \
290 in_offset_h * in_linesize + in_offset_w * (bits >> 3); \
291 uint8_t *dst = out->data[plane] + out_offset_h * out_linesize + out_offset_w * (bits >> 3); \
292 const uint8_t *mask = plane == 3 ? s->mask : NULL; \
293 const int width = s->pr_width[plane]; \
294 const int height = s->pr_height[plane]; \
296 const int slice_start = (height * jobnr ) / nb_jobs; \
297 const int slice_end = (height * (jobnr + 1)) / nb_jobs; \
299 for (int y = slice_start; y < slice_end && !mask; y++) { \
300 const int16_t *const u = s->u[map] + y * uv_linesize * ws * ws; \
301 const int16_t *const v = s->v[map] + y * uv_linesize * ws * ws; \
302 const int16_t *const ker = s->ker[map] + y * uv_linesize * ws * ws; \
304 s->remap_line(dst + y * out_linesize, width, src, in_linesize, u, v, ker); \
307 for (int y = slice_start; y < slice_end && mask; y++) { \
308 memcpy(dst + y * out_linesize, mask + y * width * (bits >> 3), width * (bits >> 3)); \
325 #define DEFINE_REMAP_LINE(ws, bits, div) \
326 static void remap##ws##_##bits##bit_line_c(uint8_t *dst, int width, const uint8_t *const src, \
327 ptrdiff_t in_linesize, \
328 const int16_t *const u, const int16_t *const v, \
329 const int16_t *const ker) \
331 const uint##bits##_t *const s = (const uint##bits##_t *const)src; \
332 uint##bits##_t *d = (uint##bits##_t *)dst; \
334 in_linesize /= div; \
336 for (int x = 0; x < width; x++) { \
337 const int16_t *const uu = u + x * ws * ws; \
338 const int16_t *const vv = v + x * ws * ws; \
339 const int16_t *const kker = ker + x * ws * ws; \
342 for (int i = 0; i < ws; i++) { \
343 for (int j = 0; j < ws; j++) { \
344 tmp += kker[i * ws + j] * s[vv[i * ws + j] * in_linesize + uu[i * ws + j]]; \
348 d[x] = av_clip_uint##bits(tmp >> 14); \
352 DEFINE_REMAP_LINE(2, 8, 1)
353 DEFINE_REMAP_LINE(3, 8, 1)
354 DEFINE_REMAP_LINE(4, 8, 1)
355 DEFINE_REMAP_LINE(2, 16, 2)
356 DEFINE_REMAP_LINE(3, 16, 2)
357 DEFINE_REMAP_LINE(4, 16, 2)
359 void ff_v360_init(V360Context *s, int depth)
363 s->remap_line = depth <= 8 ? remap1_8bit_line_c : remap1_16bit_line_c;
366 s->remap_line = depth <= 8 ? remap2_8bit_line_c : remap2_16bit_line_c;
369 s->remap_line = depth <= 8 ? remap3_8bit_line_c : remap3_16bit_line_c;
375 s->remap_line = depth <= 8 ? remap4_8bit_line_c : remap4_16bit_line_c;
380 ff_v360_init_x86(s, depth);
384 * Save nearest pixel coordinates for remapping.
386 * @param du horizontal relative coordinate
387 * @param dv vertical relative coordinate
388 * @param rmap calculated 4x4 window
389 * @param u u remap data
390 * @param v v remap data
391 * @param ker ker remap data
393 static void nearest_kernel(float du, float dv, const XYRemap *rmap,
394 int16_t *u, int16_t *v, int16_t *ker)
396 const int i = lrintf(dv) + 1;
397 const int j = lrintf(du) + 1;
399 u[0] = rmap->u[i][j];
400 v[0] = rmap->v[i][j];
404 * Calculate kernel for bilinear interpolation.
406 * @param du horizontal relative coordinate
407 * @param dv vertical relative coordinate
408 * @param rmap calculated 4x4 window
409 * @param u u remap data
410 * @param v v remap data
411 * @param ker ker remap data
413 static void bilinear_kernel(float du, float dv, const XYRemap *rmap,
414 int16_t *u, int16_t *v, int16_t *ker)
416 for (int i = 0; i < 2; i++) {
417 for (int j = 0; j < 2; j++) {
418 u[i * 2 + j] = rmap->u[i + 1][j + 1];
419 v[i * 2 + j] = rmap->v[i + 1][j + 1];
423 ker[0] = lrintf((1.f - du) * (1.f - dv) * 16385.f);
424 ker[1] = lrintf( du * (1.f - dv) * 16385.f);
425 ker[2] = lrintf((1.f - du) * dv * 16385.f);
426 ker[3] = lrintf( du * dv * 16385.f);
430 * Calculate 1-dimensional lagrange coefficients.
432 * @param t relative coordinate
433 * @param coeffs coefficients
435 static inline void calculate_lagrange_coeffs(float t, float *coeffs)
437 coeffs[0] = (t - 1.f) * (t - 2.f) * 0.5f;
438 coeffs[1] = -t * (t - 2.f);
439 coeffs[2] = t * (t - 1.f) * 0.5f;
443 * Calculate kernel for lagrange interpolation.
445 * @param du horizontal relative coordinate
446 * @param dv vertical relative coordinate
447 * @param rmap calculated 4x4 window
448 * @param u u remap data
449 * @param v v remap data
450 * @param ker ker remap data
452 static void lagrange_kernel(float du, float dv, const XYRemap *rmap,
453 int16_t *u, int16_t *v, int16_t *ker)
458 calculate_lagrange_coeffs(du, du_coeffs);
459 calculate_lagrange_coeffs(dv, dv_coeffs);
461 for (int i = 0; i < 3; i++) {
462 for (int j = 0; j < 3; j++) {
463 u[i * 3 + j] = rmap->u[i + 1][j + 1];
464 v[i * 3 + j] = rmap->v[i + 1][j + 1];
465 ker[i * 3 + j] = lrintf(du_coeffs[j] * dv_coeffs[i] * 16385.f);
471 * Calculate 1-dimensional cubic coefficients.
473 * @param t relative coordinate
474 * @param coeffs coefficients
476 static inline void calculate_bicubic_coeffs(float t, float *coeffs)
478 const float tt = t * t;
479 const float ttt = t * t * t;
481 coeffs[0] = - t / 3.f + tt / 2.f - ttt / 6.f;
482 coeffs[1] = 1.f - t / 2.f - tt + ttt / 2.f;
483 coeffs[2] = t + tt / 2.f - ttt / 2.f;
484 coeffs[3] = - t / 6.f + ttt / 6.f;
488 * Calculate kernel for bicubic interpolation.
490 * @param du horizontal relative coordinate
491 * @param dv vertical relative coordinate
492 * @param rmap calculated 4x4 window
493 * @param u u remap data
494 * @param v v remap data
495 * @param ker ker remap data
497 static void bicubic_kernel(float du, float dv, const XYRemap *rmap,
498 int16_t *u, int16_t *v, int16_t *ker)
503 calculate_bicubic_coeffs(du, du_coeffs);
504 calculate_bicubic_coeffs(dv, dv_coeffs);
506 for (int i = 0; i < 4; i++) {
507 for (int j = 0; j < 4; j++) {
508 u[i * 4 + j] = rmap->u[i][j];
509 v[i * 4 + j] = rmap->v[i][j];
510 ker[i * 4 + j] = lrintf(du_coeffs[j] * dv_coeffs[i] * 16385.f);
516 * Calculate 1-dimensional lanczos coefficients.
518 * @param t relative coordinate
519 * @param coeffs coefficients
521 static inline void calculate_lanczos_coeffs(float t, float *coeffs)
525 for (int i = 0; i < 4; i++) {
526 const float x = M_PI * (t - i + 1);
530 coeffs[i] = sinf(x) * sinf(x / 2.f) / (x * x / 2.f);
535 for (int i = 0; i < 4; i++) {
541 * Calculate kernel for lanczos interpolation.
543 * @param du horizontal relative coordinate
544 * @param dv vertical relative coordinate
545 * @param rmap calculated 4x4 window
546 * @param u u remap data
547 * @param v v remap data
548 * @param ker ker remap data
550 static void lanczos_kernel(float du, float dv, const XYRemap *rmap,
551 int16_t *u, int16_t *v, int16_t *ker)
556 calculate_lanczos_coeffs(du, du_coeffs);
557 calculate_lanczos_coeffs(dv, dv_coeffs);
559 for (int i = 0; i < 4; i++) {
560 for (int j = 0; j < 4; j++) {
561 u[i * 4 + j] = rmap->u[i][j];
562 v[i * 4 + j] = rmap->v[i][j];
563 ker[i * 4 + j] = lrintf(du_coeffs[j] * dv_coeffs[i] * 16385.f);
569 * Calculate 1-dimensional spline16 coefficients.
571 * @param t relative coordinate
572 * @param coeffs coefficients
574 static void calculate_spline16_coeffs(float t, float *coeffs)
576 coeffs[0] = ((-1.f / 3.f * t + 0.8f) * t - 7.f / 15.f) * t;
577 coeffs[1] = ((t - 9.f / 5.f) * t - 0.2f) * t + 1.f;
578 coeffs[2] = ((6.f / 5.f - t) * t + 0.8f) * t;
579 coeffs[3] = ((1.f / 3.f * t - 0.2f) * t - 2.f / 15.f) * t;
583 * Calculate kernel for spline16 interpolation.
585 * @param du horizontal relative coordinate
586 * @param dv vertical relative coordinate
587 * @param rmap calculated 4x4 window
588 * @param u u remap data
589 * @param v v remap data
590 * @param ker ker remap data
592 static void spline16_kernel(float du, float dv, const XYRemap *rmap,
593 int16_t *u, int16_t *v, int16_t *ker)
598 calculate_spline16_coeffs(du, du_coeffs);
599 calculate_spline16_coeffs(dv, dv_coeffs);
601 for (int i = 0; i < 4; i++) {
602 for (int j = 0; j < 4; j++) {
603 u[i * 4 + j] = rmap->u[i][j];
604 v[i * 4 + j] = rmap->v[i][j];
605 ker[i * 4 + j] = lrintf(du_coeffs[j] * dv_coeffs[i] * 16385.f);
611 * Calculate 1-dimensional gaussian coefficients.
613 * @param t relative coordinate
614 * @param coeffs coefficients
616 static void calculate_gaussian_coeffs(float t, float *coeffs)
620 for (int i = 0; i < 4; i++) {
621 const float x = t - (i - 1);
625 coeffs[i] = expf(-2.f * x * x) * expf(-x * x / 2.f);
630 for (int i = 0; i < 4; i++) {
636 * Calculate kernel for gaussian interpolation.
638 * @param du horizontal relative coordinate
639 * @param dv vertical relative coordinate
640 * @param rmap calculated 4x4 window
641 * @param u u remap data
642 * @param v v remap data
643 * @param ker ker remap data
645 static void gaussian_kernel(float du, float dv, const XYRemap *rmap,
646 int16_t *u, int16_t *v, int16_t *ker)
651 calculate_gaussian_coeffs(du, du_coeffs);
652 calculate_gaussian_coeffs(dv, dv_coeffs);
654 for (int i = 0; i < 4; i++) {
655 for (int j = 0; j < 4; j++) {
656 u[i * 4 + j] = rmap->u[i][j];
657 v[i * 4 + j] = rmap->v[i][j];
658 ker[i * 4 + j] = lrintf(du_coeffs[j] * dv_coeffs[i] * 16385.f);
664 * Modulo operation with only positive remainders.
669 * @return positive remainder of (a / b)
671 static inline int mod(int a, int b)
673 const int res = a % b;
682 * Reflect y operation.
684 * @param y input vertical position
685 * @param h input height
687 static inline int reflecty(int y, int h)
692 return 2 * h - 1 - y;
699 * Reflect x operation for equirect.
701 * @param x input horizontal position
702 * @param y input vertical position
703 * @param w input width
704 * @param h input height
706 static inline int ereflectx(int x, int y, int w, int h)
715 * Reflect x operation.
717 * @param x input horizontal position
718 * @param y input vertical position
719 * @param w input width
720 * @param h input height
722 static inline int reflectx(int x, int y, int w, int h)
731 * Convert char to corresponding direction.
732 * Used for cubemap options.
734 static int get_direction(char c)
755 * Convert char to corresponding rotation angle.
756 * Used for cubemap options.
758 static int get_rotation(char c)
775 * Convert char to corresponding rotation order.
777 static int get_rorder(char c)
795 * Prepare data for processing cubemap input format.
797 * @param ctx filter context
801 static int prepare_cube_in(AVFilterContext *ctx)
803 V360Context *s = ctx->priv;
805 for (int face = 0; face < NB_FACES; face++) {
806 const char c = s->in_forder[face];
810 av_log(ctx, AV_LOG_ERROR,
811 "Incomplete in_forder option. Direction for all 6 faces should be specified.\n");
812 return AVERROR(EINVAL);
815 direction = get_direction(c);
816 if (direction == -1) {
817 av_log(ctx, AV_LOG_ERROR,
818 "Incorrect direction symbol '%c' in in_forder option.\n", c);
819 return AVERROR(EINVAL);
822 s->in_cubemap_face_order[direction] = face;
825 for (int face = 0; face < NB_FACES; face++) {
826 const char c = s->in_frot[face];
830 av_log(ctx, AV_LOG_ERROR,
831 "Incomplete in_frot option. Rotation for all 6 faces should be specified.\n");
832 return AVERROR(EINVAL);
835 rotation = get_rotation(c);
836 if (rotation == -1) {
837 av_log(ctx, AV_LOG_ERROR,
838 "Incorrect rotation symbol '%c' in in_frot option.\n", c);
839 return AVERROR(EINVAL);
842 s->in_cubemap_face_rotation[face] = rotation;
849 * Prepare data for processing cubemap output format.
851 * @param ctx filter context
855 static int prepare_cube_out(AVFilterContext *ctx)
857 V360Context *s = ctx->priv;
859 for (int face = 0; face < NB_FACES; face++) {
860 const char c = s->out_forder[face];
864 av_log(ctx, AV_LOG_ERROR,
865 "Incomplete out_forder option. Direction for all 6 faces should be specified.\n");
866 return AVERROR(EINVAL);
869 direction = get_direction(c);
870 if (direction == -1) {
871 av_log(ctx, AV_LOG_ERROR,
872 "Incorrect direction symbol '%c' in out_forder option.\n", c);
873 return AVERROR(EINVAL);
876 s->out_cubemap_direction_order[face] = direction;
879 for (int face = 0; face < NB_FACES; face++) {
880 const char c = s->out_frot[face];
884 av_log(ctx, AV_LOG_ERROR,
885 "Incomplete out_frot option. Rotation for all 6 faces should be specified.\n");
886 return AVERROR(EINVAL);
889 rotation = get_rotation(c);
890 if (rotation == -1) {
891 av_log(ctx, AV_LOG_ERROR,
892 "Incorrect rotation symbol '%c' in out_frot option.\n", c);
893 return AVERROR(EINVAL);
896 s->out_cubemap_face_rotation[face] = rotation;
902 static inline void rotate_cube_face(float *uf, float *vf, int rotation)
928 static inline void rotate_cube_face_inverse(float *uf, float *vf, int rotation)
959 static void normalize_vector(float *vec)
961 const float norm = sqrtf(vec[0] * vec[0] + vec[1] * vec[1] + vec[2] * vec[2]);
969 * Calculate 3D coordinates on sphere for corresponding cubemap position.
970 * Common operation for every cubemap.
972 * @param s filter private context
973 * @param uf horizontal cubemap coordinate [0, 1)
974 * @param vf vertical cubemap coordinate [0, 1)
975 * @param face face of cubemap
976 * @param vec coordinates on sphere
977 * @param scalew scale for uf
978 * @param scaleh scale for vf
980 static void cube_to_xyz(const V360Context *s,
981 float uf, float vf, int face,
982 float *vec, float scalew, float scaleh)
984 const int direction = s->out_cubemap_direction_order[face];
990 rotate_cube_face_inverse(&uf, &vf, s->out_cubemap_face_rotation[face]);
1031 normalize_vector(vec);
1035 * Calculate cubemap position for corresponding 3D coordinates on sphere.
1036 * Common operation for every cubemap.
1038 * @param s filter private context
1039 * @param vec coordinated on sphere
1040 * @param uf horizontal cubemap coordinate [0, 1)
1041 * @param vf vertical cubemap coordinate [0, 1)
1042 * @param direction direction of view
1044 static void xyz_to_cube(const V360Context *s,
1046 float *uf, float *vf, int *direction)
1048 const float phi = atan2f(vec[0], vec[2]);
1049 const float theta = asinf(vec[1]);
1050 float phi_norm, theta_threshold;
1053 if (phi >= -M_PI_4 && phi < M_PI_4) {
1056 } else if (phi >= -(M_PI_2 + M_PI_4) && phi < -M_PI_4) {
1058 phi_norm = phi + M_PI_2;
1059 } else if (phi >= M_PI_4 && phi < M_PI_2 + M_PI_4) {
1061 phi_norm = phi - M_PI_2;
1064 phi_norm = phi + ((phi > 0.f) ? -M_PI : M_PI);
1067 theta_threshold = atanf(cosf(phi_norm));
1068 if (theta > theta_threshold) {
1070 } else if (theta < -theta_threshold) {
1074 switch (*direction) {
1076 *uf = -vec[2] / vec[0];
1077 *vf = vec[1] / vec[0];
1080 *uf = -vec[2] / vec[0];
1081 *vf = -vec[1] / vec[0];
1084 *uf = -vec[0] / vec[1];
1085 *vf = -vec[2] / vec[1];
1088 *uf = vec[0] / vec[1];
1089 *vf = -vec[2] / vec[1];
1092 *uf = vec[0] / vec[2];
1093 *vf = vec[1] / vec[2];
1096 *uf = vec[0] / vec[2];
1097 *vf = -vec[1] / vec[2];
1103 face = s->in_cubemap_face_order[*direction];
1104 rotate_cube_face(uf, vf, s->in_cubemap_face_rotation[face]);
1106 (*uf) *= s->input_mirror_modifier[0];
1107 (*vf) *= s->input_mirror_modifier[1];
1111 * Find position on another cube face in case of overflow/underflow.
1112 * Used for calculation of interpolation window.
1114 * @param s filter private context
1115 * @param uf horizontal cubemap coordinate
1116 * @param vf vertical cubemap coordinate
1117 * @param direction direction of view
1118 * @param new_uf new horizontal cubemap coordinate
1119 * @param new_vf new vertical cubemap coordinate
1120 * @param face face position on cubemap
1122 static void process_cube_coordinates(const V360Context *s,
1123 float uf, float vf, int direction,
1124 float *new_uf, float *new_vf, int *face)
1127 * Cubemap orientation
1134 * +-------+-------+-------+-------+ ^ e |
1136 * | left | front | right | back | | g |
1137 * +-------+-------+-------+-------+ v h v
1143 *face = s->in_cubemap_face_order[direction];
1144 rotate_cube_face_inverse(&uf, &vf, s->in_cubemap_face_rotation[*face]);
1146 if ((uf < -1.f || uf >= 1.f) && (vf < -1.f || vf >= 1.f)) {
1147 // There are no pixels to use in this case
1150 } else if (uf < -1.f) {
1152 switch (direction) {
1186 } else if (uf >= 1.f) {
1188 switch (direction) {
1222 } else if (vf < -1.f) {
1224 switch (direction) {
1258 } else if (vf >= 1.f) {
1260 switch (direction) {
1300 *face = s->in_cubemap_face_order[direction];
1301 rotate_cube_face(new_uf, new_vf, s->in_cubemap_face_rotation[*face]);
1305 * Calculate 3D coordinates on sphere for corresponding frame position in cubemap3x2 format.
1307 * @param s filter private context
1308 * @param i horizontal position on frame [0, width)
1309 * @param j vertical position on frame [0, height)
1310 * @param width frame width
1311 * @param height frame height
1312 * @param vec coordinates on sphere
1314 static int cube3x2_to_xyz(const V360Context *s,
1315 int i, int j, int width, int height,
1318 const float scalew = s->fout_pad > 0 ? 1.f - s->fout_pad / (width / 3.f) : 1.f - s->out_pad;
1319 const float scaleh = s->fout_pad > 0 ? 1.f - s->fout_pad / (height / 2.f) : 1.f - s->out_pad;
1321 const float ew = width / 3.f;
1322 const float eh = height / 2.f;
1324 const int u_face = floorf(i / ew);
1325 const int v_face = floorf(j / eh);
1326 const int face = u_face + 3 * v_face;
1328 const int u_shift = ceilf(ew * u_face);
1329 const int v_shift = ceilf(eh * v_face);
1330 const int ewi = ceilf(ew * (u_face + 1)) - u_shift;
1331 const int ehi = ceilf(eh * (v_face + 1)) - v_shift;
1333 const float uf = 2.f * (i - u_shift + 0.5f) / ewi - 1.f;
1334 const float vf = 2.f * (j - v_shift + 0.5f) / ehi - 1.f;
1336 cube_to_xyz(s, uf, vf, face, vec, scalew, scaleh);
1342 * Calculate frame position in cubemap3x2 format for corresponding 3D coordinates on sphere.
1344 * @param s filter private context
1345 * @param vec coordinates on sphere
1346 * @param width frame width
1347 * @param height frame height
1348 * @param us horizontal coordinates for interpolation window
1349 * @param vs vertical coordinates for interpolation window
1350 * @param du horizontal relative coordinate
1351 * @param dv vertical relative coordinate
1353 static int xyz_to_cube3x2(const V360Context *s,
1354 const float *vec, int width, int height,
1355 int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
1357 const float scalew = s->fin_pad > 0 ? 1.f - s->fin_pad / (width / 3.f) : 1.f - s->in_pad;
1358 const float scaleh = s->fin_pad > 0 ? 1.f - s->fin_pad / (height / 2.f) : 1.f - s->in_pad;
1359 const float ew = width / 3.f;
1360 const float eh = height / 2.f;
1364 int direction, face;
1367 xyz_to_cube(s, vec, &uf, &vf, &direction);
1372 face = s->in_cubemap_face_order[direction];
1375 ewi = ceilf(ew * (u_face + 1)) - ceilf(ew * u_face);
1376 ehi = ceilf(eh * (v_face + 1)) - ceilf(eh * v_face);
1378 uf = 0.5f * ewi * (uf + 1.f) - 0.5f;
1379 vf = 0.5f * ehi * (vf + 1.f) - 0.5f;
1387 for (int i = 0; i < 4; i++) {
1388 for (int j = 0; j < 4; j++) {
1389 int new_ui = ui + j - 1;
1390 int new_vi = vi + i - 1;
1391 int u_shift, v_shift;
1392 int new_ewi, new_ehi;
1394 if (new_ui >= 0 && new_ui < ewi && new_vi >= 0 && new_vi < ehi) {
1395 face = s->in_cubemap_face_order[direction];
1399 u_shift = ceilf(ew * u_face);
1400 v_shift = ceilf(eh * v_face);
1402 uf = 2.f * new_ui / ewi - 1.f;
1403 vf = 2.f * new_vi / ehi - 1.f;
1408 process_cube_coordinates(s, uf, vf, direction, &uf, &vf, &face);
1415 u_shift = ceilf(ew * u_face);
1416 v_shift = ceilf(eh * v_face);
1417 new_ewi = ceilf(ew * (u_face + 1)) - u_shift;
1418 new_ehi = ceilf(eh * (v_face + 1)) - v_shift;
1420 new_ui = av_clip(lrintf(0.5f * new_ewi * (uf + 1.f)), 0, new_ewi - 1);
1421 new_vi = av_clip(lrintf(0.5f * new_ehi * (vf + 1.f)), 0, new_ehi - 1);
1424 us[i][j] = u_shift + new_ui;
1425 vs[i][j] = v_shift + new_vi;
1433 * Calculate 3D coordinates on sphere for corresponding frame position in cubemap1x6 format.
1435 * @param s filter private context
1436 * @param i horizontal position on frame [0, width)
1437 * @param j vertical position on frame [0, height)
1438 * @param width frame width
1439 * @param height frame height
1440 * @param vec coordinates on sphere
1442 static int cube1x6_to_xyz(const V360Context *s,
1443 int i, int j, int width, int height,
1446 const float scalew = s->fout_pad > 0 ? 1.f - (float)(s->fout_pad) / width : 1.f - s->out_pad;
1447 const float scaleh = s->fout_pad > 0 ? 1.f - s->fout_pad / (height / 6.f) : 1.f - s->out_pad;
1449 const float ew = width;
1450 const float eh = height / 6.f;
1452 const int face = floorf(j / eh);
1454 const int v_shift = ceilf(eh * face);
1455 const int ehi = ceilf(eh * (face + 1)) - v_shift;
1457 const float uf = 2.f * (i + 0.5f) / ew - 1.f;
1458 const float vf = 2.f * (j - v_shift + 0.5f) / ehi - 1.f;
1460 cube_to_xyz(s, uf, vf, face, vec, scalew, scaleh);
1466 * Calculate 3D coordinates on sphere for corresponding frame position in cubemap6x1 format.
1468 * @param s filter private context
1469 * @param i horizontal position on frame [0, width)
1470 * @param j vertical position on frame [0, height)
1471 * @param width frame width
1472 * @param height frame height
1473 * @param vec coordinates on sphere
1475 static int cube6x1_to_xyz(const V360Context *s,
1476 int i, int j, int width, int height,
1479 const float scalew = s->fout_pad > 0 ? 1.f - s->fout_pad / (width / 6.f) : 1.f - s->out_pad;
1480 const float scaleh = s->fout_pad > 0 ? 1.f - (float)(s->fout_pad) / height : 1.f - s->out_pad;
1482 const float ew = width / 6.f;
1483 const float eh = height;
1485 const int face = floorf(i / ew);
1487 const int u_shift = ceilf(ew * face);
1488 const int ewi = ceilf(ew * (face + 1)) - u_shift;
1490 const float uf = 2.f * (i - u_shift + 0.5f) / ewi - 1.f;
1491 const float vf = 2.f * (j + 0.5f) / eh - 1.f;
1493 cube_to_xyz(s, uf, vf, face, vec, scalew, scaleh);
1499 * Calculate frame position in cubemap1x6 format for corresponding 3D coordinates on sphere.
1501 * @param s filter private context
1502 * @param vec coordinates on sphere
1503 * @param width frame width
1504 * @param height frame height
1505 * @param us horizontal coordinates for interpolation window
1506 * @param vs vertical coordinates for interpolation window
1507 * @param du horizontal relative coordinate
1508 * @param dv vertical relative coordinate
1510 static int xyz_to_cube1x6(const V360Context *s,
1511 const float *vec, int width, int height,
1512 int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
1514 const float scalew = s->fin_pad > 0 ? 1.f - (float)(s->fin_pad) / width : 1.f - s->in_pad;
1515 const float scaleh = s->fin_pad > 0 ? 1.f - s->fin_pad / (height / 6.f) : 1.f - s->in_pad;
1516 const float eh = height / 6.f;
1517 const int ewi = width;
1521 int direction, face;
1523 xyz_to_cube(s, vec, &uf, &vf, &direction);
1528 face = s->in_cubemap_face_order[direction];
1529 ehi = ceilf(eh * (face + 1)) - ceilf(eh * face);
1531 uf = 0.5f * ewi * (uf + 1.f) - 0.5f;
1532 vf = 0.5f * ehi * (vf + 1.f) - 0.5f;
1540 for (int i = 0; i < 4; i++) {
1541 for (int j = 0; j < 4; j++) {
1542 int new_ui = ui + j - 1;
1543 int new_vi = vi + i - 1;
1547 if (new_ui >= 0 && new_ui < ewi && new_vi >= 0 && new_vi < ehi) {
1548 face = s->in_cubemap_face_order[direction];
1550 v_shift = ceilf(eh * face);
1552 uf = 2.f * new_ui / ewi - 1.f;
1553 vf = 2.f * new_vi / ehi - 1.f;
1558 process_cube_coordinates(s, uf, vf, direction, &uf, &vf, &face);
1563 v_shift = ceilf(eh * face);
1564 new_ehi = ceilf(eh * (face + 1)) - v_shift;
1566 new_ui = av_clip(lrintf(0.5f * ewi * (uf + 1.f)), 0, ewi - 1);
1567 new_vi = av_clip(lrintf(0.5f * new_ehi * (vf + 1.f)), 0, new_ehi - 1);
1571 vs[i][j] = v_shift + new_vi;
1579 * Calculate frame position in cubemap6x1 format for corresponding 3D coordinates on sphere.
1581 * @param s filter private context
1582 * @param vec coordinates on sphere
1583 * @param width frame width
1584 * @param height frame height
1585 * @param us horizontal coordinates for interpolation window
1586 * @param vs vertical coordinates for interpolation window
1587 * @param du horizontal relative coordinate
1588 * @param dv vertical relative coordinate
1590 static int xyz_to_cube6x1(const V360Context *s,
1591 const float *vec, int width, int height,
1592 int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
1594 const float scalew = s->fin_pad > 0 ? 1.f - s->fin_pad / (width / 6.f) : 1.f - s->in_pad;
1595 const float scaleh = s->fin_pad > 0 ? 1.f - (float)(s->fin_pad) / height : 1.f - s->in_pad;
1596 const float ew = width / 6.f;
1597 const int ehi = height;
1601 int direction, face;
1603 xyz_to_cube(s, vec, &uf, &vf, &direction);
1608 face = s->in_cubemap_face_order[direction];
1609 ewi = ceilf(ew * (face + 1)) - ceilf(ew * face);
1611 uf = 0.5f * ewi * (uf + 1.f) - 0.5f;
1612 vf = 0.5f * ehi * (vf + 1.f) - 0.5f;
1620 for (int i = 0; i < 4; i++) {
1621 for (int j = 0; j < 4; j++) {
1622 int new_ui = ui + j - 1;
1623 int new_vi = vi + i - 1;
1627 if (new_ui >= 0 && new_ui < ewi && new_vi >= 0 && new_vi < ehi) {
1628 face = s->in_cubemap_face_order[direction];
1630 u_shift = ceilf(ew * face);
1632 uf = 2.f * new_ui / ewi - 1.f;
1633 vf = 2.f * new_vi / ehi - 1.f;
1638 process_cube_coordinates(s, uf, vf, direction, &uf, &vf, &face);
1643 u_shift = ceilf(ew * face);
1644 new_ewi = ceilf(ew * (face + 1)) - u_shift;
1646 new_ui = av_clip(lrintf(0.5f * new_ewi * (uf + 1.f)), 0, new_ewi - 1);
1647 new_vi = av_clip(lrintf(0.5f * ehi * (vf + 1.f)), 0, ehi - 1);
1650 us[i][j] = u_shift + new_ui;
1659 * Calculate 3D coordinates on sphere for corresponding frame position in equirectangular format.
1661 * @param s filter private context
1662 * @param i horizontal position on frame [0, width)
1663 * @param j vertical position on frame [0, height)
1664 * @param width frame width
1665 * @param height frame height
1666 * @param vec coordinates on sphere
1668 static int equirect_to_xyz(const V360Context *s,
1669 int i, int j, int width, int height,
1672 const float phi = ((2.f * i + 0.5f) / width - 1.f) * M_PI;
1673 const float theta = ((2.f * j + 0.5f) / height - 1.f) * M_PI_2;
1675 const float sin_phi = sinf(phi);
1676 const float cos_phi = cosf(phi);
1677 const float sin_theta = sinf(theta);
1678 const float cos_theta = cosf(theta);
1680 vec[0] = cos_theta * sin_phi;
1682 vec[2] = cos_theta * cos_phi;
1688 * Calculate 3D coordinates on sphere for corresponding frame position in half equirectangular format.
1690 * @param s filter private context
1691 * @param i horizontal position on frame [0, width)
1692 * @param j vertical position on frame [0, height)
1693 * @param width frame width
1694 * @param height frame height
1695 * @param vec coordinates on sphere
1697 static int hequirect_to_xyz(const V360Context *s,
1698 int i, int j, int width, int height,
1701 const float phi = ((2.f * i + 0.5f) / width - 1.f) * M_PI_2;
1702 const float theta = ((2.f * j + 0.5f) / height - 1.f) * M_PI_2;
1704 const float sin_phi = sinf(phi);
1705 const float cos_phi = cosf(phi);
1706 const float sin_theta = sinf(theta);
1707 const float cos_theta = cosf(theta);
1709 vec[0] = cos_theta * sin_phi;
1711 vec[2] = cos_theta * cos_phi;
1717 * Prepare data for processing stereographic output format.
1719 * @param ctx filter context
1721 * @return error code
1723 static int prepare_stereographic_out(AVFilterContext *ctx)
1725 V360Context *s = ctx->priv;
1727 s->flat_range[0] = tanf(FFMIN(s->h_fov, 359.f) * M_PI / 720.f);
1728 s->flat_range[1] = tanf(FFMIN(s->v_fov, 359.f) * M_PI / 720.f);
1734 * Calculate 3D coordinates on sphere for corresponding frame position in stereographic format.
1736 * @param s filter private context
1737 * @param i horizontal position on frame [0, width)
1738 * @param j vertical position on frame [0, height)
1739 * @param width frame width
1740 * @param height frame height
1741 * @param vec coordinates on sphere
1743 static int stereographic_to_xyz(const V360Context *s,
1744 int i, int j, int width, int height,
1747 const float x = ((2.f * i + 1.f) / width - 1.f) * s->flat_range[0];
1748 const float y = ((2.f * j + 1.f) / height - 1.f) * s->flat_range[1];
1749 const float r = hypotf(x, y);
1750 const float theta = atanf(r) * 2.f;
1751 const float sin_theta = sinf(theta);
1753 vec[0] = x / r * sin_theta;
1754 vec[1] = y / r * sin_theta;
1755 vec[2] = cosf(theta);
1757 normalize_vector(vec);
1763 * Prepare data for processing stereographic input format.
1765 * @param ctx filter context
1767 * @return error code
1769 static int prepare_stereographic_in(AVFilterContext *ctx)
1771 V360Context *s = ctx->priv;
1773 s->iflat_range[0] = tanf(FFMIN(s->ih_fov, 359.f) * M_PI / 720.f);
1774 s->iflat_range[1] = tanf(FFMIN(s->iv_fov, 359.f) * M_PI / 720.f);
1780 * Calculate frame position in stereographic format for corresponding 3D coordinates on sphere.
1782 * @param s filter private context
1783 * @param vec coordinates on sphere
1784 * @param width frame width
1785 * @param height frame height
1786 * @param us horizontal coordinates for interpolation window
1787 * @param vs vertical coordinates for interpolation window
1788 * @param du horizontal relative coordinate
1789 * @param dv vertical relative coordinate
1791 static int xyz_to_stereographic(const V360Context *s,
1792 const float *vec, int width, int height,
1793 int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
1795 const float theta = acosf(vec[2]);
1796 const float r = tanf(theta * 0.5f);
1797 const float c = r / hypotf(vec[0], vec[1]);
1798 const float x = vec[0] * c / s->iflat_range[0] * s->input_mirror_modifier[0];
1799 const float y = vec[1] * c / s->iflat_range[1] * s->input_mirror_modifier[1];
1801 const float uf = (x + 1.f) * width / 2.f;
1802 const float vf = (y + 1.f) * height / 2.f;
1804 const int ui = floorf(uf);
1805 const int vi = floorf(vf);
1807 const int visible = isfinite(x) && isfinite(y) && vi >= 0 && vi < height && ui >= 0 && ui < width;
1809 *du = visible ? uf - ui : 0.f;
1810 *dv = visible ? vf - vi : 0.f;
1812 for (int i = 0; i < 4; i++) {
1813 for (int j = 0; j < 4; j++) {
1814 us[i][j] = visible ? av_clip(ui + j - 1, 0, width - 1) : 0;
1815 vs[i][j] = visible ? av_clip(vi + i - 1, 0, height - 1) : 0;
1823 * Calculate frame position in equirectangular format for corresponding 3D coordinates on sphere.
1825 * @param s filter private context
1826 * @param vec coordinates on sphere
1827 * @param width frame width
1828 * @param height frame height
1829 * @param us horizontal coordinates for interpolation window
1830 * @param vs vertical coordinates for interpolation window
1831 * @param du horizontal relative coordinate
1832 * @param dv vertical relative coordinate
1834 static int xyz_to_equirect(const V360Context *s,
1835 const float *vec, int width, int height,
1836 int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
1838 const float phi = atan2f(vec[0], vec[2]) * s->input_mirror_modifier[0];
1839 const float theta = asinf(vec[1]) * s->input_mirror_modifier[1];
1841 const float uf = (phi / M_PI + 1.f) * width / 2.f;
1842 const float vf = (theta / M_PI_2 + 1.f) * height / 2.f;
1844 const int ui = floorf(uf);
1845 const int vi = floorf(vf);
1850 for (int i = 0; i < 4; i++) {
1851 for (int j = 0; j < 4; j++) {
1852 us[i][j] = ereflectx(ui + j - 1, vi + i - 1, width, height);
1853 vs[i][j] = reflecty(vi + i - 1, height);
1861 * Calculate frame position in half equirectangular format for corresponding 3D coordinates on sphere.
1863 * @param s filter private context
1864 * @param vec coordinates on sphere
1865 * @param width frame width
1866 * @param height frame height
1867 * @param us horizontal coordinates for interpolation window
1868 * @param vs vertical coordinates for interpolation window
1869 * @param du horizontal relative coordinate
1870 * @param dv vertical relative coordinate
1872 static int xyz_to_hequirect(const V360Context *s,
1873 const float *vec, int width, int height,
1874 int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
1876 const float phi = atan2f(vec[0], vec[2]) * s->input_mirror_modifier[0];
1877 const float theta = asinf(vec[1]) * s->input_mirror_modifier[1];
1879 const float uf = (phi / M_PI_2 + 1.f) * width / 2.f;
1880 const float vf = (theta / M_PI_2 + 1.f) * height / 2.f;
1882 const int ui = floorf(uf);
1883 const int vi = floorf(vf);
1885 const int visible = phi >= -M_PI_2 && phi <= M_PI_2;
1890 for (int i = 0; i < 4; i++) {
1891 for (int j = 0; j < 4; j++) {
1892 us[i][j] = av_clip(ui + j - 1, 0, width - 1);
1893 vs[i][j] = av_clip(vi + i - 1, 0, height - 1);
1901 * Prepare data for processing flat input format.
1903 * @param ctx filter context
1905 * @return error code
1907 static int prepare_flat_in(AVFilterContext *ctx)
1909 V360Context *s = ctx->priv;
1911 s->iflat_range[0] = tanf(0.5f * s->ih_fov * M_PI / 180.f);
1912 s->iflat_range[1] = tanf(0.5f * s->iv_fov * M_PI / 180.f);
1918 * Calculate frame position in flat format for corresponding 3D coordinates on sphere.
1920 * @param s filter private context
1921 * @param vec coordinates on sphere
1922 * @param width frame width
1923 * @param height frame height
1924 * @param us horizontal coordinates for interpolation window
1925 * @param vs vertical coordinates for interpolation window
1926 * @param du horizontal relative coordinate
1927 * @param dv vertical relative coordinate
1929 static int xyz_to_flat(const V360Context *s,
1930 const float *vec, int width, int height,
1931 int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
1933 const float theta = acosf(vec[2]);
1934 const float r = tanf(theta);
1935 const float rr = fabsf(r) < 1e+6f ? r : hypotf(width, height);
1936 const float zf = vec[2];
1937 const float h = hypotf(vec[0], vec[1]);
1938 const float c = h <= 1e-6f ? 1.f : rr / h;
1939 float uf = vec[0] * c / s->iflat_range[0] * s->input_mirror_modifier[0];
1940 float vf = vec[1] * c / s->iflat_range[1] * s->input_mirror_modifier[1];
1941 int visible, ui, vi;
1943 uf = zf >= 0.f ? (uf + 1.f) * width / 2.f : 0.f;
1944 vf = zf >= 0.f ? (vf + 1.f) * height / 2.f : 0.f;
1949 visible = vi >= 0 && vi < height && ui >= 0 && ui < width && zf >= 0.f;
1954 for (int i = 0; i < 4; i++) {
1955 for (int j = 0; j < 4; j++) {
1956 us[i][j] = visible ? av_clip(ui + j - 1, 0, width - 1) : 0;
1957 vs[i][j] = visible ? av_clip(vi + i - 1, 0, height - 1) : 0;
1965 * Calculate frame position in mercator format for corresponding 3D coordinates on sphere.
1967 * @param s filter private context
1968 * @param vec coordinates on sphere
1969 * @param width frame width
1970 * @param height frame height
1971 * @param us horizontal coordinates for interpolation window
1972 * @param vs vertical coordinates for interpolation window
1973 * @param du horizontal relative coordinate
1974 * @param dv vertical relative coordinate
1976 static int xyz_to_mercator(const V360Context *s,
1977 const float *vec, int width, int height,
1978 int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
1980 const float phi = atan2f(vec[0], vec[2]) * s->input_mirror_modifier[0];
1981 const float theta = vec[1] * s->input_mirror_modifier[1];
1983 const float uf = (phi / M_PI + 1.f) * width / 2.f;
1984 const float vf = (av_clipf(logf((1.f + theta) / (1.f - theta)) / (2.f * M_PI), -1.f, 1.f) + 1.f) * height / 2.f;
1986 const int ui = floorf(uf);
1987 const int vi = floorf(vf);
1992 for (int i = 0; i < 4; i++) {
1993 for (int j = 0; j < 4; j++) {
1994 us[i][j] = av_clip(ui + j - 1, 0, width - 1);
1995 vs[i][j] = av_clip(vi + i - 1, 0, height - 1);
2003 * Calculate 3D coordinates on sphere for corresponding frame position in mercator format.
2005 * @param s filter private context
2006 * @param i horizontal position on frame [0, width)
2007 * @param j vertical position on frame [0, height)
2008 * @param width frame width
2009 * @param height frame height
2010 * @param vec coordinates on sphere
2012 static int mercator_to_xyz(const V360Context *s,
2013 int i, int j, int width, int height,
2016 const float phi = ((2.f * i + 1.f) / width - 1.f) * M_PI + M_PI_2;
2017 const float y = ((2.f * j + 1.f) / height - 1.f) * M_PI;
2018 const float div = expf(2.f * y) + 1.f;
2020 const float sin_phi = sinf(phi);
2021 const float cos_phi = cosf(phi);
2022 const float sin_theta = 2.f * expf(y) / div;
2023 const float cos_theta = (expf(2.f * y) - 1.f) / div;
2025 vec[0] = -sin_theta * cos_phi;
2027 vec[2] = sin_theta * sin_phi;
2033 * Calculate frame position in ball format for corresponding 3D coordinates on sphere.
2035 * @param s filter private context
2036 * @param vec coordinates on sphere
2037 * @param width frame width
2038 * @param height frame height
2039 * @param us horizontal coordinates for interpolation window
2040 * @param vs vertical coordinates for interpolation window
2041 * @param du horizontal relative coordinate
2042 * @param dv vertical relative coordinate
2044 static int xyz_to_ball(const V360Context *s,
2045 const float *vec, int width, int height,
2046 int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
2048 const float l = hypotf(vec[0], vec[1]);
2049 const float r = sqrtf(1.f - vec[2]) / M_SQRT2;
2051 const float uf = (1.f + r * vec[0] * s->input_mirror_modifier[0] / (l > 0.f ? l : 1.f)) * width * 0.5f;
2052 const float vf = (1.f + r * vec[1] * s->input_mirror_modifier[1] / (l > 0.f ? l : 1.f)) * height * 0.5f;
2054 const int ui = floorf(uf);
2055 const int vi = floorf(vf);
2060 for (int i = 0; i < 4; i++) {
2061 for (int j = 0; j < 4; j++) {
2062 us[i][j] = av_clip(ui + j - 1, 0, width - 1);
2063 vs[i][j] = av_clip(vi + i - 1, 0, height - 1);
2071 * Calculate 3D coordinates on sphere for corresponding frame position in ball format.
2073 * @param s filter private context
2074 * @param i horizontal position on frame [0, width)
2075 * @param j vertical position on frame [0, height)
2076 * @param width frame width
2077 * @param height frame height
2078 * @param vec coordinates on sphere
2080 static int ball_to_xyz(const V360Context *s,
2081 int i, int j, int width, int height,
2084 const float x = (2.f * i + 1.f) / width - 1.f;
2085 const float y = (2.f * j + 1.f) / height - 1.f;
2086 const float l = hypotf(x, y);
2089 const float z = 2.f * l * sqrtf(1.f - l * l);
2091 vec[0] = z * x / (l > 0.f ? l : 1.f);
2092 vec[1] = z * y / (l > 0.f ? l : 1.f);
2093 vec[2] = 1.f - 2.f * l * l;
2105 * Calculate 3D coordinates on sphere for corresponding frame position in hammer format.
2107 * @param s filter private context
2108 * @param i horizontal position on frame [0, width)
2109 * @param j vertical position on frame [0, height)
2110 * @param width frame width
2111 * @param height frame height
2112 * @param vec coordinates on sphere
2114 static int hammer_to_xyz(const V360Context *s,
2115 int i, int j, int width, int height,
2118 const float x = ((2.f * i + 1.f) / width - 1.f);
2119 const float y = ((2.f * j + 1.f) / height - 1.f);
2121 const float xx = x * x;
2122 const float yy = y * y;
2124 const float z = sqrtf(1.f - xx * 0.5f - yy * 0.5f);
2126 const float a = M_SQRT2 * x * z;
2127 const float b = 2.f * z * z - 1.f;
2129 const float aa = a * a;
2130 const float bb = b * b;
2132 const float w = sqrtf(1.f - 2.f * yy * z * z);
2134 vec[0] = w * 2.f * a * b / (aa + bb);
2135 vec[1] = M_SQRT2 * y * z;
2136 vec[2] = w * (bb - aa) / (aa + bb);
2138 normalize_vector(vec);
2144 * Calculate frame position in hammer format for corresponding 3D coordinates on sphere.
2146 * @param s filter private context
2147 * @param vec coordinates on sphere
2148 * @param width frame width
2149 * @param height frame height
2150 * @param us horizontal coordinates for interpolation window
2151 * @param vs vertical coordinates for interpolation window
2152 * @param du horizontal relative coordinate
2153 * @param dv vertical relative coordinate
2155 static int xyz_to_hammer(const V360Context *s,
2156 const float *vec, int width, int height,
2157 int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
2159 const float theta = atan2f(vec[0], vec[2]) * s->input_mirror_modifier[0];
2161 const float z = sqrtf(1.f + sqrtf(1.f - vec[1] * vec[1]) * cosf(theta * 0.5f));
2162 const float x = sqrtf(1.f - vec[1] * vec[1]) * sinf(theta * 0.5f) / z;
2163 const float y = vec[1] / z * s->input_mirror_modifier[1];
2165 const float uf = (x + 1.f) * width / 2.f;
2166 const float vf = (y + 1.f) * height / 2.f;
2168 const int ui = floorf(uf);
2169 const int vi = floorf(vf);
2174 for (int i = 0; i < 4; i++) {
2175 for (int j = 0; j < 4; j++) {
2176 us[i][j] = av_clip(ui + j - 1, 0, width - 1);
2177 vs[i][j] = av_clip(vi + i - 1, 0, height - 1);
2185 * Calculate 3D coordinates on sphere for corresponding frame position in sinusoidal format.
2187 * @param s filter private context
2188 * @param i horizontal position on frame [0, width)
2189 * @param j vertical position on frame [0, height)
2190 * @param width frame width
2191 * @param height frame height
2192 * @param vec coordinates on sphere
2194 static int sinusoidal_to_xyz(const V360Context *s,
2195 int i, int j, int width, int height,
2198 const float theta = ((2.f * j + 1.f) / height - 1.f) * M_PI_2;
2199 const float phi = ((2.f * i + 1.f) / width - 1.f) * M_PI / cosf(theta);
2201 const float sin_phi = sinf(phi);
2202 const float cos_phi = cosf(phi);
2203 const float sin_theta = sinf(theta);
2204 const float cos_theta = cosf(theta);
2206 vec[0] = cos_theta * sin_phi;
2208 vec[2] = cos_theta * cos_phi;
2210 normalize_vector(vec);
2216 * Calculate frame position in sinusoidal format for corresponding 3D coordinates on sphere.
2218 * @param s filter private context
2219 * @param vec coordinates on sphere
2220 * @param width frame width
2221 * @param height frame height
2222 * @param us horizontal coordinates for interpolation window
2223 * @param vs vertical coordinates for interpolation window
2224 * @param du horizontal relative coordinate
2225 * @param dv vertical relative coordinate
2227 static int xyz_to_sinusoidal(const V360Context *s,
2228 const float *vec, int width, int height,
2229 int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
2231 const float theta = asinf(vec[1]) * s->input_mirror_modifier[1];
2232 const float phi = atan2f(vec[0], vec[2]) * s->input_mirror_modifier[0] * cosf(theta);
2234 const float uf = (phi / M_PI + 1.f) * width / 2.f;
2235 const float vf = (theta / M_PI_2 + 1.f) * height / 2.f;
2237 const int ui = floorf(uf);
2238 const int vi = floorf(vf);
2243 for (int i = 0; i < 4; i++) {
2244 for (int j = 0; j < 4; j++) {
2245 us[i][j] = av_clip(ui + j - 1, 0, width - 1);
2246 vs[i][j] = av_clip(vi + i - 1, 0, height - 1);
2254 * Prepare data for processing equi-angular cubemap input format.
2256 * @param ctx filter context
2258 * @return error code
2260 static int prepare_eac_in(AVFilterContext *ctx)
2262 V360Context *s = ctx->priv;
2264 if (s->ih_flip && s->iv_flip) {
2265 s->in_cubemap_face_order[RIGHT] = BOTTOM_LEFT;
2266 s->in_cubemap_face_order[LEFT] = BOTTOM_RIGHT;
2267 s->in_cubemap_face_order[UP] = TOP_LEFT;
2268 s->in_cubemap_face_order[DOWN] = TOP_RIGHT;
2269 s->in_cubemap_face_order[FRONT] = BOTTOM_MIDDLE;
2270 s->in_cubemap_face_order[BACK] = TOP_MIDDLE;
2271 } else if (s->ih_flip) {
2272 s->in_cubemap_face_order[RIGHT] = TOP_LEFT;
2273 s->in_cubemap_face_order[LEFT] = TOP_RIGHT;
2274 s->in_cubemap_face_order[UP] = BOTTOM_LEFT;
2275 s->in_cubemap_face_order[DOWN] = BOTTOM_RIGHT;
2276 s->in_cubemap_face_order[FRONT] = TOP_MIDDLE;
2277 s->in_cubemap_face_order[BACK] = BOTTOM_MIDDLE;
2278 } else if (s->iv_flip) {
2279 s->in_cubemap_face_order[RIGHT] = BOTTOM_RIGHT;
2280 s->in_cubemap_face_order[LEFT] = BOTTOM_LEFT;
2281 s->in_cubemap_face_order[UP] = TOP_RIGHT;
2282 s->in_cubemap_face_order[DOWN] = TOP_LEFT;
2283 s->in_cubemap_face_order[FRONT] = BOTTOM_MIDDLE;
2284 s->in_cubemap_face_order[BACK] = TOP_MIDDLE;
2286 s->in_cubemap_face_order[RIGHT] = TOP_RIGHT;
2287 s->in_cubemap_face_order[LEFT] = TOP_LEFT;
2288 s->in_cubemap_face_order[UP] = BOTTOM_RIGHT;
2289 s->in_cubemap_face_order[DOWN] = BOTTOM_LEFT;
2290 s->in_cubemap_face_order[FRONT] = TOP_MIDDLE;
2291 s->in_cubemap_face_order[BACK] = BOTTOM_MIDDLE;
2295 s->in_cubemap_face_rotation[TOP_LEFT] = ROT_270;
2296 s->in_cubemap_face_rotation[TOP_MIDDLE] = ROT_90;
2297 s->in_cubemap_face_rotation[TOP_RIGHT] = ROT_270;
2298 s->in_cubemap_face_rotation[BOTTOM_LEFT] = ROT_0;
2299 s->in_cubemap_face_rotation[BOTTOM_MIDDLE] = ROT_0;
2300 s->in_cubemap_face_rotation[BOTTOM_RIGHT] = ROT_0;
2302 s->in_cubemap_face_rotation[TOP_LEFT] = ROT_0;
2303 s->in_cubemap_face_rotation[TOP_MIDDLE] = ROT_0;
2304 s->in_cubemap_face_rotation[TOP_RIGHT] = ROT_0;
2305 s->in_cubemap_face_rotation[BOTTOM_LEFT] = ROT_270;
2306 s->in_cubemap_face_rotation[BOTTOM_MIDDLE] = ROT_90;
2307 s->in_cubemap_face_rotation[BOTTOM_RIGHT] = ROT_270;
2314 * Prepare data for processing equi-angular cubemap output format.
2316 * @param ctx filter context
2318 * @return error code
2320 static int prepare_eac_out(AVFilterContext *ctx)
2322 V360Context *s = ctx->priv;
2324 s->out_cubemap_direction_order[TOP_LEFT] = LEFT;
2325 s->out_cubemap_direction_order[TOP_MIDDLE] = FRONT;
2326 s->out_cubemap_direction_order[TOP_RIGHT] = RIGHT;
2327 s->out_cubemap_direction_order[BOTTOM_LEFT] = DOWN;
2328 s->out_cubemap_direction_order[BOTTOM_MIDDLE] = BACK;
2329 s->out_cubemap_direction_order[BOTTOM_RIGHT] = UP;
2331 s->out_cubemap_face_rotation[TOP_LEFT] = ROT_0;
2332 s->out_cubemap_face_rotation[TOP_MIDDLE] = ROT_0;
2333 s->out_cubemap_face_rotation[TOP_RIGHT] = ROT_0;
2334 s->out_cubemap_face_rotation[BOTTOM_LEFT] = ROT_270;
2335 s->out_cubemap_face_rotation[BOTTOM_MIDDLE] = ROT_90;
2336 s->out_cubemap_face_rotation[BOTTOM_RIGHT] = ROT_270;
2342 * Calculate 3D coordinates on sphere for corresponding frame position in equi-angular cubemap format.
2344 * @param s filter private context
2345 * @param i horizontal position on frame [0, width)
2346 * @param j vertical position on frame [0, height)
2347 * @param width frame width
2348 * @param height frame height
2349 * @param vec coordinates on sphere
2351 static int eac_to_xyz(const V360Context *s,
2352 int i, int j, int width, int height,
2355 const float pixel_pad = 2;
2356 const float u_pad = pixel_pad / width;
2357 const float v_pad = pixel_pad / height;
2359 int u_face, v_face, face;
2361 float l_x, l_y, l_z;
2363 float uf = (i + 0.5f) / width;
2364 float vf = (j + 0.5f) / height;
2366 // EAC has 2-pixel padding on faces except between faces on the same row
2367 // Padding pixels seems not to be stretched with tangent as regular pixels
2368 // Formulas below approximate original padding as close as I could get experimentally
2370 // Horizontal padding
2371 uf = 3.f * (uf - u_pad) / (1.f - 2.f * u_pad);
2375 } else if (uf >= 3.f) {
2379 u_face = floorf(uf);
2380 uf = fmodf(uf, 1.f) - 0.5f;
2384 v_face = floorf(vf * 2.f);
2385 vf = (vf - v_pad - 0.5f * v_face) / (0.5f - 2.f * v_pad) - 0.5f;
2387 if (uf >= -0.5f && uf < 0.5f) {
2388 uf = tanf(M_PI_2 * uf);
2392 if (vf >= -0.5f && vf < 0.5f) {
2393 vf = tanf(M_PI_2 * vf);
2398 face = u_face + 3 * v_face;
2439 normalize_vector(vec);
2445 * Calculate frame position in equi-angular cubemap format for corresponding 3D coordinates on sphere.
2447 * @param s filter private context
2448 * @param vec coordinates on sphere
2449 * @param width frame width
2450 * @param height frame height
2451 * @param us horizontal coordinates for interpolation window
2452 * @param vs vertical coordinates for interpolation window
2453 * @param du horizontal relative coordinate
2454 * @param dv vertical relative coordinate
2456 static int xyz_to_eac(const V360Context *s,
2457 const float *vec, int width, int height,
2458 int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
2460 const float pixel_pad = 2;
2461 const float u_pad = pixel_pad / width;
2462 const float v_pad = pixel_pad / height;
2466 int direction, face;
2469 xyz_to_cube(s, vec, &uf, &vf, &direction);
2471 face = s->in_cubemap_face_order[direction];
2475 uf = M_2_PI * atanf(uf) + 0.5f;
2476 vf = M_2_PI * atanf(vf) + 0.5f;
2478 // These formulas are inversed from eac_to_xyz ones
2479 uf = (uf + u_face) * (1.f - 2.f * u_pad) / 3.f + u_pad;
2480 vf = vf * (0.5f - 2.f * v_pad) + v_pad + 0.5f * v_face;
2494 for (int i = 0; i < 4; i++) {
2495 for (int j = 0; j < 4; j++) {
2496 us[i][j] = av_clip(ui + j - 1, 0, width - 1);
2497 vs[i][j] = av_clip(vi + i - 1, 0, height - 1);
2505 * Prepare data for processing flat output format.
2507 * @param ctx filter context
2509 * @return error code
2511 static int prepare_flat_out(AVFilterContext *ctx)
2513 V360Context *s = ctx->priv;
2515 s->flat_range[0] = tanf(0.5f * s->h_fov * M_PI / 180.f);
2516 s->flat_range[1] = tanf(0.5f * s->v_fov * M_PI / 180.f);
2522 * Calculate 3D coordinates on sphere for corresponding frame position in flat format.
2524 * @param s filter private context
2525 * @param i horizontal position on frame [0, width)
2526 * @param j vertical position on frame [0, height)
2527 * @param width frame width
2528 * @param height frame height
2529 * @param vec coordinates on sphere
2531 static int flat_to_xyz(const V360Context *s,
2532 int i, int j, int width, int height,
2535 const float l_x = s->flat_range[0] * ((2.f * i + 0.5f) / width - 1.f);
2536 const float l_y = s->flat_range[1] * ((2.f * j + 0.5f) / height - 1.f);
2542 normalize_vector(vec);
2548 * Prepare data for processing fisheye output format.
2550 * @param ctx filter context
2552 * @return error code
2554 static int prepare_fisheye_out(AVFilterContext *ctx)
2556 V360Context *s = ctx->priv;
2558 s->flat_range[0] = s->h_fov / 180.f;
2559 s->flat_range[1] = s->v_fov / 180.f;
2565 * Calculate 3D coordinates on sphere for corresponding frame position in fisheye format.
2567 * @param s filter private context
2568 * @param i horizontal position on frame [0, width)
2569 * @param j vertical position on frame [0, height)
2570 * @param width frame width
2571 * @param height frame height
2572 * @param vec coordinates on sphere
2574 static int fisheye_to_xyz(const V360Context *s,
2575 int i, int j, int width, int height,
2578 const float uf = s->flat_range[0] * ((2.f * i) / width - 1.f);
2579 const float vf = s->flat_range[1] * ((2.f * j + 1.f) / height - 1.f);
2581 const float phi = atan2f(vf, uf);
2582 const float theta = M_PI_2 * (1.f - hypotf(uf, vf));
2584 const float sin_phi = sinf(phi);
2585 const float cos_phi = cosf(phi);
2586 const float sin_theta = sinf(theta);
2587 const float cos_theta = cosf(theta);
2589 vec[0] = cos_theta * cos_phi;
2590 vec[1] = cos_theta * sin_phi;
2593 normalize_vector(vec);
2599 * Prepare data for processing fisheye input format.
2601 * @param ctx filter context
2603 * @return error code
2605 static int prepare_fisheye_in(AVFilterContext *ctx)
2607 V360Context *s = ctx->priv;
2609 s->iflat_range[0] = s->ih_fov / 180.f;
2610 s->iflat_range[1] = s->iv_fov / 180.f;
2616 * Calculate frame position in fisheye format for corresponding 3D coordinates on sphere.
2618 * @param s filter private context
2619 * @param vec coordinates on sphere
2620 * @param width frame width
2621 * @param height frame height
2622 * @param us horizontal coordinates for interpolation window
2623 * @param vs vertical coordinates for interpolation window
2624 * @param du horizontal relative coordinate
2625 * @param dv vertical relative coordinate
2627 static int xyz_to_fisheye(const V360Context *s,
2628 const float *vec, int width, int height,
2629 int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
2631 const float h = hypotf(vec[0], vec[1]);
2632 const float lh = h > 0.f ? h : 1.f;
2633 const float phi = atan2f(h, vec[2]) / M_PI;
2635 float uf = vec[0] / lh * phi * s->input_mirror_modifier[0] / s->iflat_range[0];
2636 float vf = vec[1] / lh * phi * s->input_mirror_modifier[1] / s->iflat_range[1];
2638 const int visible = hypotf(uf, vf) <= 0.5f;
2641 uf = (uf + 0.5f) * width;
2642 vf = (vf + 0.5f) * height;
2647 *du = visible ? uf - ui : 0.f;
2648 *dv = visible ? vf - vi : 0.f;
2650 for (int i = 0; i < 4; i++) {
2651 for (int j = 0; j < 4; j++) {
2652 us[i][j] = visible ? av_clip(ui + j - 1, 0, width - 1) : 0;
2653 vs[i][j] = visible ? av_clip(vi + i - 1, 0, height - 1) : 0;
2661 * Calculate 3D coordinates on sphere for corresponding frame position in pannini format.
2663 * @param s filter private context
2664 * @param i horizontal position on frame [0, width)
2665 * @param j vertical position on frame [0, height)
2666 * @param width frame width
2667 * @param height frame height
2668 * @param vec coordinates on sphere
2670 static int pannini_to_xyz(const V360Context *s,
2671 int i, int j, int width, int height,
2674 const float uf = ((2.f * i + 1.f) / width - 1.f);
2675 const float vf = ((2.f * j + 1.f) / height - 1.f);
2677 const float d = s->h_fov;
2678 const float k = uf * uf / ((d + 1.f) * (d + 1.f));
2679 const float dscr = k * k * d * d - (k + 1.f) * (k * d * d - 1.f);
2680 const float clon = (-k * d + sqrtf(dscr)) / (k + 1.f);
2681 const float S = (d + 1.f) / (d + clon);
2682 const float lon = atan2f(uf, S * clon);
2683 const float lat = atan2f(vf, S);
2685 vec[0] = sinf(lon) * cosf(lat);
2687 vec[2] = cosf(lon) * cosf(lat);
2689 normalize_vector(vec);
2695 * Calculate frame position in pannini format for corresponding 3D coordinates on sphere.
2697 * @param s filter private context
2698 * @param vec coordinates on sphere
2699 * @param width frame width
2700 * @param height frame height
2701 * @param us horizontal coordinates for interpolation window
2702 * @param vs vertical coordinates for interpolation window
2703 * @param du horizontal relative coordinate
2704 * @param dv vertical relative coordinate
2706 static int xyz_to_pannini(const V360Context *s,
2707 const float *vec, int width, int height,
2708 int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
2710 const float phi = atan2f(vec[0], vec[2]) * s->input_mirror_modifier[0];
2711 const float theta = asinf(vec[1]) * s->input_mirror_modifier[1];
2713 const float d = s->ih_fov;
2714 const float S = (d + 1.f) / (d + cosf(phi));
2716 const float x = S * sinf(phi);
2717 const float y = S * tanf(theta);
2719 const float uf = (x + 1.f) * width / 2.f;
2720 const float vf = (y + 1.f) * height / 2.f;
2722 const int ui = floorf(uf);
2723 const int vi = floorf(vf);
2725 const int visible = vi >= 0 && vi < height && ui >= 0 && ui < width && vec[2] >= 0.f;
2730 for (int i = 0; i < 4; i++) {
2731 for (int j = 0; j < 4; j++) {
2732 us[i][j] = visible ? av_clip(ui + j - 1, 0, width - 1) : 0;
2733 vs[i][j] = visible ? av_clip(vi + i - 1, 0, height - 1) : 0;
2741 * Prepare data for processing cylindrical output format.
2743 * @param ctx filter context
2745 * @return error code
2747 static int prepare_cylindrical_out(AVFilterContext *ctx)
2749 V360Context *s = ctx->priv;
2751 s->flat_range[0] = M_PI * s->h_fov / 360.f;
2752 s->flat_range[1] = tanf(0.5f * s->v_fov * M_PI / 180.f);
2758 * Calculate 3D coordinates on sphere for corresponding frame position in cylindrical format.
2760 * @param s filter private context
2761 * @param i horizontal position on frame [0, width)
2762 * @param j vertical position on frame [0, height)
2763 * @param width frame width
2764 * @param height frame height
2765 * @param vec coordinates on sphere
2767 static int cylindrical_to_xyz(const V360Context *s,
2768 int i, int j, int width, int height,
2771 const float uf = s->flat_range[0] * ((2.f * i + 1.f) / width - 1.f);
2772 const float vf = s->flat_range[1] * ((2.f * j + 1.f) / height - 1.f);
2774 const float phi = uf;
2775 const float theta = atanf(vf);
2777 const float sin_phi = sinf(phi);
2778 const float cos_phi = cosf(phi);
2779 const float sin_theta = sinf(theta);
2780 const float cos_theta = cosf(theta);
2782 vec[0] = cos_theta * sin_phi;
2784 vec[2] = cos_theta * cos_phi;
2786 normalize_vector(vec);
2792 * Prepare data for processing cylindrical input format.
2794 * @param ctx filter context
2796 * @return error code
2798 static int prepare_cylindrical_in(AVFilterContext *ctx)
2800 V360Context *s = ctx->priv;
2802 s->iflat_range[0] = M_PI * s->ih_fov / 360.f;
2803 s->iflat_range[1] = tanf(0.5f * s->iv_fov * M_PI / 180.f);
2809 * Calculate frame position in cylindrical format for corresponding 3D coordinates on sphere.
2811 * @param s filter private context
2812 * @param vec coordinates on sphere
2813 * @param width frame width
2814 * @param height frame height
2815 * @param us horizontal coordinates for interpolation window
2816 * @param vs vertical coordinates for interpolation window
2817 * @param du horizontal relative coordinate
2818 * @param dv vertical relative coordinate
2820 static int xyz_to_cylindrical(const V360Context *s,
2821 const float *vec, int width, int height,
2822 int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
2824 const float phi = atan2f(vec[0], vec[2]) * s->input_mirror_modifier[0] / s->iflat_range[0];
2825 const float theta = asinf(vec[1]) * s->input_mirror_modifier[1];
2827 const float uf = (phi + 1.f) * (width - 1) / 2.f;
2828 const float vf = (tanf(theta) / s->iflat_range[1] + 1.f) * height / 2.f;
2830 const int ui = floorf(uf);
2831 const int vi = floorf(vf);
2833 const int visible = vi >= 0 && vi < height && ui >= 0 && ui < width &&
2834 theta <= M_PI * s->iv_fov / 180.f &&
2835 theta >= -M_PI * s->iv_fov / 180.f;
2840 for (int i = 0; i < 4; i++) {
2841 for (int j = 0; j < 4; j++) {
2842 us[i][j] = visible ? av_clip(ui + j - 1, 0, width - 1) : 0;
2843 vs[i][j] = visible ? av_clip(vi + i - 1, 0, height - 1) : 0;
2851 * Calculate 3D coordinates on sphere for corresponding frame position in perspective format.
2853 * @param s filter private context
2854 * @param i horizontal position on frame [0, width)
2855 * @param j vertical position on frame [0, height)
2856 * @param width frame width
2857 * @param height frame height
2858 * @param vec coordinates on sphere
2860 static int perspective_to_xyz(const V360Context *s,
2861 int i, int j, int width, int height,
2864 const float uf = ((2.f * i + 1.f) / width - 1.f);
2865 const float vf = ((2.f * j + 1.f) / height - 1.f);
2866 const float rh = hypotf(uf, vf);
2867 const float sinzz = 1.f - rh * rh;
2868 const float h = 1.f + s->v_fov;
2869 const float sinz = (h - sqrtf(sinzz)) / (h / rh + rh / h);
2870 const float sinz2 = sinz * sinz;
2873 const float cosz = sqrtf(1.f - sinz2);
2875 const float theta = asinf(cosz);
2876 const float phi = atan2f(uf, vf);
2878 const float sin_phi = sinf(phi);
2879 const float cos_phi = cosf(phi);
2880 const float sin_theta = sinf(theta);
2881 const float cos_theta = cosf(theta);
2883 vec[0] = cos_theta * sin_phi;
2885 vec[2] = cos_theta * cos_phi;
2893 normalize_vector(vec);
2898 * Calculate 3D coordinates on sphere for corresponding frame position in tetrahedron format.
2900 * @param s filter private context
2901 * @param i horizontal position on frame [0, width)
2902 * @param j vertical position on frame [0, height)
2903 * @param width frame width
2904 * @param height frame height
2905 * @param vec coordinates on sphere
2907 static int tetrahedron_to_xyz(const V360Context *s,
2908 int i, int j, int width, int height,
2911 const float uf = (float)i / width;
2912 const float vf = (float)j / height;
2914 vec[0] = uf < 0.5f ? uf * 4.f - 1.f : 3.f - uf * 4.f;
2915 vec[1] = 1.f - vf * 2.f;
2916 vec[2] = 2.f * fabsf(1.f - fabsf(1.f - uf * 2.f + vf)) - 1.f;
2918 normalize_vector(vec);
2924 * Calculate frame position in tetrahedron format for corresponding 3D coordinates on sphere.
2926 * @param s filter private context
2927 * @param vec coordinates on sphere
2928 * @param width frame width
2929 * @param height frame height
2930 * @param us horizontal coordinates for interpolation window
2931 * @param vs vertical coordinates for interpolation window
2932 * @param du horizontal relative coordinate
2933 * @param dv vertical relative coordinate
2935 static int xyz_to_tetrahedron(const V360Context *s,
2936 const float *vec, int width, int height,
2937 int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
2939 const float d0 = vec[0] * 1.f + vec[1] * 1.f + vec[2] *-1.f;
2940 const float d1 = vec[0] *-1.f + vec[1] *-1.f + vec[2] *-1.f;
2941 const float d2 = vec[0] * 1.f + vec[1] *-1.f + vec[2] * 1.f;
2942 const float d3 = vec[0] *-1.f + vec[1] * 1.f + vec[2] * 1.f;
2943 const float d = FFMAX(d0, FFMAX3(d1, d2, d3));
2945 float uf, vf, x, y, z;
2952 vf = 0.5f - y * 0.5f * s->input_mirror_modifier[1];
2954 if ((x + y >= 0.f && y + z >= 0.f && -z - x <= 0.f) ||
2955 (x + y <= 0.f && -y + z >= 0.f && z - x >= 0.f)) {
2956 uf = 0.25f * x * s->input_mirror_modifier[0] + 0.25f;
2958 uf = 0.75f - 0.25f * x * s->input_mirror_modifier[0];
2970 for (int i = 0; i < 4; i++) {
2971 for (int j = 0; j < 4; j++) {
2972 us[i][j] = reflectx(ui + j - 1, vi + i - 1, width, height);
2973 vs[i][j] = reflecty(vi + i - 1, height);
2981 * Calculate 3D coordinates on sphere for corresponding frame position in dual fisheye format.
2983 * @param s filter private context
2984 * @param i horizontal position on frame [0, width)
2985 * @param j vertical position on frame [0, height)
2986 * @param width frame width
2987 * @param height frame height
2988 * @param vec coordinates on sphere
2990 static int dfisheye_to_xyz(const V360Context *s,
2991 int i, int j, int width, int height,
2994 const float scale = 1.f + s->out_pad;
2996 const float ew = width / 2.f;
2997 const float eh = height;
2999 const int ei = i >= ew ? i - ew : i;
3000 const float m = i >= ew ? 1.f : -1.f;
3002 const float uf = ((2.f * ei) / ew - 1.f) * scale;
3003 const float vf = ((2.f * j + 1.f) / eh - 1.f) * scale;
3005 const float h = hypotf(uf, vf);
3006 const float lh = h > 0.f ? h : 1.f;
3007 const float theta = m * M_PI_2 * (1.f - h);
3009 const float sin_theta = sinf(theta);
3010 const float cos_theta = cosf(theta);
3012 vec[0] = cos_theta * m * uf / lh;
3013 vec[1] = cos_theta * vf / lh;
3016 normalize_vector(vec);
3022 * Calculate frame position in dual fisheye format for corresponding 3D coordinates on sphere.
3024 * @param s filter private context
3025 * @param vec coordinates on sphere
3026 * @param width frame width
3027 * @param height frame height
3028 * @param us horizontal coordinates for interpolation window
3029 * @param vs vertical coordinates for interpolation window
3030 * @param du horizontal relative coordinate
3031 * @param dv vertical relative coordinate
3033 static int xyz_to_dfisheye(const V360Context *s,
3034 const float *vec, int width, int height,
3035 int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
3037 const float scale = 1.f - s->in_pad;
3039 const float ew = width / 2.f;
3040 const float eh = height;
3042 const float h = hypotf(vec[0], vec[1]);
3043 const float lh = h > 0.f ? h : 1.f;
3044 const float theta = acosf(fabsf(vec[2])) / M_PI;
3046 float uf = (theta * (vec[0] / lh) * s->input_mirror_modifier[0] * scale + 0.5f) * ew;
3047 float vf = (theta * (vec[1] / lh) * s->input_mirror_modifier[1] * scale + 0.5f) * eh;
3052 if (vec[2] >= 0.f) {
3053 u_shift = ceilf(ew);
3065 for (int i = 0; i < 4; i++) {
3066 for (int j = 0; j < 4; j++) {
3067 us[i][j] = av_clip(u_shift + ui + j - 1, 0, width - 1);
3068 vs[i][j] = av_clip( vi + i - 1, 0, height - 1);
3076 * Calculate 3D coordinates on sphere for corresponding frame position in barrel facebook's format.
3078 * @param s filter private context
3079 * @param i horizontal position on frame [0, width)
3080 * @param j vertical position on frame [0, height)
3081 * @param width frame width
3082 * @param height frame height
3083 * @param vec coordinates on sphere
3085 static int barrel_to_xyz(const V360Context *s,
3086 int i, int j, int width, int height,
3089 const float scale = 0.99f;
3090 float l_x, l_y, l_z;
3092 if (i < 4 * width / 5) {
3093 const float theta_range = M_PI_4;
3095 const int ew = 4 * width / 5;
3096 const int eh = height;
3098 const float phi = ((2.f * i) / ew - 1.f) * M_PI / scale;
3099 const float theta = ((2.f * j) / eh - 1.f) * theta_range / scale;
3101 const float sin_phi = sinf(phi);
3102 const float cos_phi = cosf(phi);
3103 const float sin_theta = sinf(theta);
3104 const float cos_theta = cosf(theta);
3106 l_x = cos_theta * sin_phi;
3108 l_z = cos_theta * cos_phi;
3110 const int ew = width / 5;
3111 const int eh = height / 2;
3116 uf = 2.f * (i - 4 * ew) / ew - 1.f;
3117 vf = 2.f * (j ) / eh - 1.f;
3126 uf = 2.f * (i - 4 * ew) / ew - 1.f;
3127 vf = 2.f * (j - eh) / eh - 1.f;
3142 normalize_vector(vec);
3148 * Calculate frame position in barrel facebook's format for corresponding 3D coordinates on sphere.
3150 * @param s filter private context
3151 * @param vec coordinates on sphere
3152 * @param width frame width
3153 * @param height frame height
3154 * @param us horizontal coordinates for interpolation window
3155 * @param vs vertical coordinates for interpolation window
3156 * @param du horizontal relative coordinate
3157 * @param dv vertical relative coordinate
3159 static int xyz_to_barrel(const V360Context *s,
3160 const float *vec, int width, int height,
3161 int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
3163 const float scale = 0.99f;
3165 const float phi = atan2f(vec[0], vec[2]) * s->input_mirror_modifier[0];
3166 const float theta = asinf(vec[1]) * s->input_mirror_modifier[1];
3167 const float theta_range = M_PI_4;
3170 int u_shift, v_shift;
3174 if (theta > -theta_range && theta < theta_range) {
3178 u_shift = s->ih_flip ? width / 5 : 0;
3181 uf = (phi / M_PI * scale + 1.f) * ew / 2.f;
3182 vf = (theta / theta_range * scale + 1.f) * eh / 2.f;
3187 u_shift = s->ih_flip ? 0 : 4 * ew;
3189 if (theta < 0.f) { // UP
3190 uf = -vec[0] / vec[1];
3191 vf = -vec[2] / vec[1];
3194 uf = vec[0] / vec[1];
3195 vf = -vec[2] / vec[1];
3199 uf *= s->input_mirror_modifier[0] * s->input_mirror_modifier[1];
3200 vf *= s->input_mirror_modifier[1];
3202 uf = 0.5f * ew * (uf * scale + 1.f);
3203 vf = 0.5f * eh * (vf * scale + 1.f);
3212 for (int i = 0; i < 4; i++) {
3213 for (int j = 0; j < 4; j++) {
3214 us[i][j] = u_shift + av_clip(ui + j - 1, 0, ew - 1);
3215 vs[i][j] = v_shift + av_clip(vi + i - 1, 0, eh - 1);
3223 * Calculate frame position in barrel split facebook's format for corresponding 3D coordinates on sphere.
3225 * @param s filter private context
3226 * @param vec coordinates on sphere
3227 * @param width frame width
3228 * @param height frame height
3229 * @param us horizontal coordinates for interpolation window
3230 * @param vs vertical coordinates for interpolation window
3231 * @param du horizontal relative coordinate
3232 * @param dv vertical relative coordinate
3234 static int xyz_to_barrelsplit(const V360Context *s,
3235 const float *vec, int width, int height,
3236 int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
3238 const float phi = atan2f(vec[0], vec[2]) * s->input_mirror_modifier[0];
3239 const float theta = asinf(vec[1]) * s->input_mirror_modifier[1];
3241 const float theta_range = M_PI_4;
3244 int u_shift, v_shift;
3248 if (theta >= -theta_range && theta <= theta_range) {
3249 const float scalew = s->fin_pad > 0 ? 1.f - s->fin_pad / (width * 2.f / 3.f) : 1.f - s->in_pad;
3250 const float scaleh = s->fin_pad > 0 ? 1.f - s->fin_pad / (height / 2.f) : 1.f - s->in_pad;
3255 u_shift = s->ih_flip ? width / 3 : 0;
3256 v_shift = phi >= M_PI_2 || phi < -M_PI_2 ? eh : 0;
3258 uf = fmodf(phi, M_PI_2) / M_PI_2;
3259 vf = theta / M_PI_4;
3262 uf = uf >= 0.f ? fmodf(uf - 1.f, 1.f) : fmodf(uf + 1.f, 1.f);
3264 uf = (uf * scalew + 1.f) * width / 3.f;
3265 vf = (vf * scaleh + 1.f) * height / 4.f;
3267 const float scalew = s->fin_pad > 0 ? 1.f - s->fin_pad / (width / 3.f) : 1.f - s->in_pad;
3268 const float scaleh = s->fin_pad > 0 ? 1.f - s->fin_pad / (height / 4.f) : 1.f - s->in_pad;
3274 u_shift = s->ih_flip ? 0 : 2 * ew;
3276 if (theta <= 0.f && theta >= -M_PI_2 &&
3277 phi <= M_PI_2 && phi >= -M_PI_2) {
3278 uf = -vec[0] / vec[1];
3279 vf = -vec[2] / vec[1];
3282 } else if (theta >= 0.f && theta <= M_PI_2 &&
3283 phi <= M_PI_2 && phi >= -M_PI_2) {
3284 uf = vec[0] / vec[1];
3285 vf = -vec[2] / vec[1];
3286 v_shift = height * 0.25f;
3287 } else if (theta <= 0.f && theta >= -M_PI_2) {
3288 uf = vec[0] / vec[1];
3289 vf = vec[2] / vec[1];
3290 v_shift = height * 0.5f;
3293 uf = -vec[0] / vec[1];
3294 vf = vec[2] / vec[1];
3295 v_shift = height * 0.75f;
3298 uf *= s->input_mirror_modifier[0] * s->input_mirror_modifier[1];
3299 vf *= s->input_mirror_modifier[1];
3301 uf = 0.5f * width / 3.f * (uf * scalew + 1.f);
3302 vf = height * 0.25f * (vf * scaleh + 1.f) + v_offset;
3311 for (int i = 0; i < 4; i++) {
3312 for (int j = 0; j < 4; j++) {
3313 us[i][j] = u_shift + av_clip(ui + j - 1, 0, ew - 1);
3314 vs[i][j] = v_shift + av_clip(vi + i - 1, 0, eh - 1);
3322 * Calculate 3D coordinates on sphere for corresponding frame position in barrel split facebook's format.
3324 * @param s filter private context
3325 * @param i horizontal position on frame [0, width)
3326 * @param j vertical position on frame [0, height)
3327 * @param width frame width
3328 * @param height frame height
3329 * @param vec coordinates on sphere
3331 static int barrelsplit_to_xyz(const V360Context *s,
3332 int i, int j, int width, int height,
3335 const float x = (i + 0.5f) / width;
3336 const float y = (j + 0.5f) / height;
3337 float l_x, l_y, l_z;
3339 if (x < 2.f / 3.f) {
3340 const float scalew = s->fout_pad > 0 ? 1.f - s->fout_pad / (width * 2.f / 3.f) : 1.f - s->out_pad;
3341 const float scaleh = s->fout_pad > 0 ? 1.f - s->fout_pad / (height / 2.f) : 1.f - s->out_pad;
3343 const float back = floorf(y * 2.f);
3345 const float phi = ((3.f / 2.f * x - 0.5f) / scalew - back) * M_PI;
3346 const float theta = (y - 0.25f - 0.5f * back) / scaleh * M_PI;
3348 const float sin_phi = sinf(phi);
3349 const float cos_phi = cosf(phi);
3350 const float sin_theta = sinf(theta);
3351 const float cos_theta = cosf(theta);
3353 l_x = cos_theta * sin_phi;
3355 l_z = cos_theta * cos_phi;
3357 const float scalew = s->fout_pad > 0 ? 1.f - s->fout_pad / (width / 3.f) : 1.f - s->out_pad;
3358 const float scaleh = s->fout_pad > 0 ? 1.f - s->fout_pad / (height / 4.f) : 1.f - s->out_pad;
3360 const int face = floorf(y * 4.f);
3371 l_x = (0.5f - uf) / scalew;
3373 l_z = (0.5f - vf) / scaleh;
3378 vf = 1.f - (vf - 0.5f);
3380 l_x = (0.5f - uf) / scalew;
3382 l_z = (-0.5f + vf) / scaleh;
3385 vf = y * 2.f - 0.5f;
3386 vf = 1.f - (1.f - vf);
3388 l_x = (0.5f - uf) / scalew;
3390 l_z = (0.5f - vf) / scaleh;
3393 vf = y * 2.f - 1.5f;
3395 l_x = (0.5f - uf) / scalew;
3397 l_z = (-0.5f + vf) / scaleh;
3406 normalize_vector(vec);
3412 * Calculate 3D coordinates on sphere for corresponding frame position in tspyramid format.
3414 * @param s filter private context
3415 * @param i horizontal position on frame [0, width)
3416 * @param j vertical position on frame [0, height)
3417 * @param width frame width
3418 * @param height frame height
3419 * @param vec coordinates on sphere
3421 static int tspyramid_to_xyz(const V360Context *s,
3422 int i, int j, int width, int height,
3425 const float x = (i + 0.5f) / width;
3426 const float y = (j + 0.5f) / height;
3429 vec[0] = x * 4.f - 1.f;
3430 vec[1] = (y * 2.f - 1.f);
3432 } else if (x >= 0.6875f && x < 0.8125f &&
3433 y >= 0.375f && y < 0.625f) {
3434 vec[0] = -(x - 0.6875f) * 16.f + 1.f;
3435 vec[1] = (y - 0.375f) * 8.f - 1.f;
3437 } else if (0.5f <= x && x < 0.6875f &&
3438 ((0.f <= y && y < 0.375f && y >= 2.f * (x - 0.5f)) ||
3439 (0.375f <= y && y < 0.625f) ||
3440 (0.625f <= y && y < 1.f && y <= 2.f * (1.f - x)))) {
3442 vec[1] = 2.f * (y - 2.f * x + 1.f) / (3.f - 4.f * x) - 1.f;
3443 vec[2] = -2.f * (x - 0.5f) / 0.1875f + 1.f;
3444 } else if (0.8125f <= x && x < 1.f &&
3445 ((0.f <= y && y < 0.375f && x >= (1.f - y / 2.f)) ||
3446 (0.375f <= y && y < 0.625f) ||
3447 (0.625f <= y && y < 1.f && y <= (2.f * x - 1.f)))) {
3449 vec[1] = 2.f * (y + 2.f * x - 2.f) / (4.f * x - 3.f) - 1.f;
3450 vec[2] = 2.f * (x - 0.8125f) / 0.1875f - 1.f;
3451 } else if (0.f <= y && y < 0.375f &&
3452 ((0.5f <= x && x < 0.8125f && y < 2.f * (x - 0.5f)) ||
3453 (0.6875f <= x && x < 0.8125f) ||
3454 (0.8125f <= x && x < 1.f && x < (1.f - y / 2.f)))) {
3455 vec[0] = 2.f * (1.f - x - 0.5f * y) / (0.5f - y) - 1.f;
3457 vec[2] = 2.f * (0.375f - y) / 0.375f - 1.f;
3459 vec[0] = 2.f * (0.5f - x + 0.5f * y) / (y - 0.5f) - 1.f;
3461 vec[2] = -2.f * (1.f - y) / 0.375f + 1.f;
3464 normalize_vector(vec);
3470 * Calculate frame position in tspyramid format for corresponding 3D coordinates on sphere.
3472 * @param s filter private context
3473 * @param vec coordinates on sphere
3474 * @param width frame width
3475 * @param height frame height
3476 * @param us horizontal coordinates for interpolation window
3477 * @param vs vertical coordinates for interpolation window
3478 * @param du horizontal relative coordinate
3479 * @param dv vertical relative coordinate
3481 static int xyz_to_tspyramid(const V360Context *s,
3482 const float *vec, int width, int height,
3483 int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
3489 xyz_to_cube(s, vec, &uf, &vf, &face);
3491 uf = (uf + 1.f) * 0.5f;
3492 vf = (vf + 1.f) * 0.5f;
3496 uf = 0.1875f * vf - 0.375f * uf * vf - 0.125f * uf + 0.8125f;
3497 vf = 0.375f - 0.375f * vf;
3503 uf = 1.f - 0.1875f * vf - 0.5f * uf + 0.375f * uf * vf;
3504 vf = 1.f - 0.375f * vf;
3507 vf = 0.25f * vf + 0.75f * uf * vf - 0.375f * uf + 0.375f;
3508 uf = 0.1875f * uf + 0.8125f;
3511 vf = 0.375f * uf - 0.75f * uf * vf + vf;
3512 uf = 0.1875f * uf + 0.5f;
3515 uf = 0.125f * uf + 0.6875f;
3516 vf = 0.25f * vf + 0.375f;
3529 for (int i = 0; i < 4; i++) {
3530 for (int j = 0; j < 4; j++) {
3531 us[i][j] = reflectx(ui + j - 1, vi + i - 1, width, height);
3532 vs[i][j] = reflecty(vi + i - 1, height);
3539 static void multiply_matrix(float c[3][3], const float a[3][3], const float b[3][3])
3541 for (int i = 0; i < 3; i++) {
3542 for (int j = 0; j < 3; j++) {
3545 for (int k = 0; k < 3; k++)
3546 sum += a[i][k] * b[k][j];
3554 * Calculate rotation matrix for yaw/pitch/roll angles.
3556 static inline void calculate_rotation_matrix(float yaw, float pitch, float roll,
3557 float rot_mat[3][3],
3558 const int rotation_order[3])
3560 const float yaw_rad = yaw * M_PI / 180.f;
3561 const float pitch_rad = pitch * M_PI / 180.f;
3562 const float roll_rad = roll * M_PI / 180.f;
3564 const float sin_yaw = sinf(yaw_rad);
3565 const float cos_yaw = cosf(yaw_rad);
3566 const float sin_pitch = sinf(pitch_rad);
3567 const float cos_pitch = cosf(pitch_rad);
3568 const float sin_roll = sinf(roll_rad);
3569 const float cos_roll = cosf(roll_rad);
3574 m[0][0][0] = cos_yaw; m[0][0][1] = 0; m[0][0][2] = sin_yaw;
3575 m[0][1][0] = 0; m[0][1][1] = 1; m[0][1][2] = 0;
3576 m[0][2][0] = -sin_yaw; m[0][2][1] = 0; m[0][2][2] = cos_yaw;
3578 m[1][0][0] = 1; m[1][0][1] = 0; m[1][0][2] = 0;
3579 m[1][1][0] = 0; m[1][1][1] = cos_pitch; m[1][1][2] = -sin_pitch;
3580 m[1][2][0] = 0; m[1][2][1] = sin_pitch; m[1][2][2] = cos_pitch;
3582 m[2][0][0] = cos_roll; m[2][0][1] = -sin_roll; m[2][0][2] = 0;
3583 m[2][1][0] = sin_roll; m[2][1][1] = cos_roll; m[2][1][2] = 0;
3584 m[2][2][0] = 0; m[2][2][1] = 0; m[2][2][2] = 1;
3586 multiply_matrix(temp, m[rotation_order[0]], m[rotation_order[1]]);
3587 multiply_matrix(rot_mat, temp, m[rotation_order[2]]);
3591 * Rotate vector with given rotation matrix.
3593 * @param rot_mat rotation matrix
3596 static inline void rotate(const float rot_mat[3][3],
3599 const float x_tmp = vec[0] * rot_mat[0][0] + vec[1] * rot_mat[0][1] + vec[2] * rot_mat[0][2];
3600 const float y_tmp = vec[0] * rot_mat[1][0] + vec[1] * rot_mat[1][1] + vec[2] * rot_mat[1][2];
3601 const float z_tmp = vec[0] * rot_mat[2][0] + vec[1] * rot_mat[2][1] + vec[2] * rot_mat[2][2];
3608 static inline void set_mirror_modifier(int h_flip, int v_flip, int d_flip,
3611 modifier[0] = h_flip ? -1.f : 1.f;
3612 modifier[1] = v_flip ? -1.f : 1.f;
3613 modifier[2] = d_flip ? -1.f : 1.f;
3616 static inline void mirror(const float *modifier, float *vec)
3618 vec[0] *= modifier[0];
3619 vec[1] *= modifier[1];
3620 vec[2] *= modifier[2];
3623 static int allocate_plane(V360Context *s, int sizeof_uv, int sizeof_ker, int sizeof_mask, int p)
3626 s->u[p] = av_calloc(s->uv_linesize[p] * s->pr_height[p], sizeof_uv);
3628 s->v[p] = av_calloc(s->uv_linesize[p] * s->pr_height[p], sizeof_uv);
3629 if (!s->u[p] || !s->v[p])
3630 return AVERROR(ENOMEM);
3633 s->ker[p] = av_calloc(s->uv_linesize[p] * s->pr_height[p], sizeof_ker);
3635 return AVERROR(ENOMEM);
3638 if (sizeof_mask && !p) {
3640 s->mask = av_calloc(s->pr_width[p] * s->pr_height[p], sizeof_mask);
3642 return AVERROR(ENOMEM);
3648 static void fov_from_dfov(int format, float d_fov, float w, float h, float *h_fov, float *v_fov)
3653 const float d = 0.5f * hypotf(w, h);
3654 const float l = d / (tanf(d_fov * M_PI / 720.f));
3656 *h_fov = 2.f * atan2f(w * 0.5f, l) * 360.f / M_PI;
3657 *v_fov = 2.f * atan2f(h * 0.5f, l) * 360.f / M_PI;
3662 const float d = 0.5f * hypotf(w, h);
3664 *h_fov = d / w * d_fov;
3665 *v_fov = d / h * d_fov;
3671 const float da = tanf(0.5f * FFMIN(d_fov, 359.f) * M_PI / 180.f);
3672 const float d = hypotf(w, h);
3674 *h_fov = atan2f(da * w, d) * 360.f / M_PI;
3675 *v_fov = atan2f(da * h, d) * 360.f / M_PI;
3686 static void set_dimensions(int *outw, int *outh, int w, int h, const AVPixFmtDescriptor *desc)
3688 outw[1] = outw[2] = FF_CEIL_RSHIFT(w, desc->log2_chroma_w);
3689 outw[0] = outw[3] = w;
3690 outh[1] = outh[2] = FF_CEIL_RSHIFT(h, desc->log2_chroma_h);
3691 outh[0] = outh[3] = h;
3694 // Calculate remap data
3695 static av_always_inline int v360_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
3697 V360Context *s = ctx->priv;
3699 for (int p = 0; p < s->nb_allocated; p++) {
3700 const int max_value = s->max_value;
3701 const int width = s->pr_width[p];
3702 const int uv_linesize = s->uv_linesize[p];
3703 const int height = s->pr_height[p];
3704 const int in_width = s->inplanewidth[p];
3705 const int in_height = s->inplaneheight[p];
3706 const int slice_start = (height * jobnr ) / nb_jobs;
3707 const int slice_end = (height * (jobnr + 1)) / nb_jobs;
3712 for (int j = slice_start; j < slice_end; j++) {
3713 for (int i = 0; i < width; i++) {
3714 int16_t *u = s->u[p] + (j * uv_linesize + i) * s->elements;
3715 int16_t *v = s->v[p] + (j * uv_linesize + i) * s->elements;
3716 int16_t *ker = s->ker[p] + (j * uv_linesize + i) * s->elements;
3717 uint8_t *mask8 = p ? NULL : s->mask + (j * s->pr_width[0] + i);
3718 uint16_t *mask16 = p ? NULL : (uint16_t *)s->mask + (j * s->pr_width[0] + i);
3719 int in_mask, out_mask;
3721 if (s->out_transpose)
3722 out_mask = s->out_transform(s, j, i, height, width, vec);
3724 out_mask = s->out_transform(s, i, j, width, height, vec);
3725 av_assert1(!isnan(vec[0]) && !isnan(vec[1]) && !isnan(vec[2]));
3726 rotate(s->rot_mat, vec);
3727 av_assert1(!isnan(vec[0]) && !isnan(vec[1]) && !isnan(vec[2]));
3728 normalize_vector(vec);
3729 mirror(s->output_mirror_modifier, vec);
3730 if (s->in_transpose)
3731 in_mask = s->in_transform(s, vec, in_height, in_width, rmap.v, rmap.u, &du, &dv);
3733 in_mask = s->in_transform(s, vec, in_width, in_height, rmap.u, rmap.v, &du, &dv);
3734 av_assert1(!isnan(du) && !isnan(dv));
3735 s->calculate_kernel(du, dv, &rmap, u, v, ker);
3737 if (!p && s->mask) {
3738 if (s->mask_size == 1) {
3739 mask8[0] = 255 * (out_mask & in_mask);
3741 mask16[0] = max_value * (out_mask & in_mask);
3751 static int config_output(AVFilterLink *outlink)
3753 AVFilterContext *ctx = outlink->src;
3754 AVFilterLink *inlink = ctx->inputs[0];
3755 V360Context *s = ctx->priv;
3756 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
3757 const int depth = desc->comp[0].depth;
3758 const int sizeof_mask = s->mask_size = (depth + 7) >> 3;
3763 int in_offset_h, in_offset_w;
3764 int out_offset_h, out_offset_w;
3766 int (*prepare_out)(AVFilterContext *ctx);
3769 s->max_value = (1 << depth) - 1;
3770 s->input_mirror_modifier[0] = s->ih_flip ? -1.f : 1.f;
3771 s->input_mirror_modifier[1] = s->iv_flip ? -1.f : 1.f;
3773 switch (s->interp) {
3775 s->calculate_kernel = nearest_kernel;
3776 s->remap_slice = depth <= 8 ? remap1_8bit_slice : remap1_16bit_slice;
3778 sizeof_uv = sizeof(int16_t) * s->elements;
3782 s->calculate_kernel = bilinear_kernel;
3783 s->remap_slice = depth <= 8 ? remap2_8bit_slice : remap2_16bit_slice;
3784 s->elements = 2 * 2;
3785 sizeof_uv = sizeof(int16_t) * s->elements;
3786 sizeof_ker = sizeof(int16_t) * s->elements;
3789 s->calculate_kernel = lagrange_kernel;
3790 s->remap_slice = depth <= 8 ? remap3_8bit_slice : remap3_16bit_slice;
3791 s->elements = 3 * 3;
3792 sizeof_uv = sizeof(int16_t) * s->elements;
3793 sizeof_ker = sizeof(int16_t) * s->elements;
3796 s->calculate_kernel = bicubic_kernel;
3797 s->remap_slice = depth <= 8 ? remap4_8bit_slice : remap4_16bit_slice;
3798 s->elements = 4 * 4;
3799 sizeof_uv = sizeof(int16_t) * s->elements;
3800 sizeof_ker = sizeof(int16_t) * s->elements;
3803 s->calculate_kernel = lanczos_kernel;
3804 s->remap_slice = depth <= 8 ? remap4_8bit_slice : remap4_16bit_slice;
3805 s->elements = 4 * 4;
3806 sizeof_uv = sizeof(int16_t) * s->elements;
3807 sizeof_ker = sizeof(int16_t) * s->elements;
3810 s->calculate_kernel = spline16_kernel;
3811 s->remap_slice = depth <= 8 ? remap4_8bit_slice : remap4_16bit_slice;
3812 s->elements = 4 * 4;
3813 sizeof_uv = sizeof(int16_t) * s->elements;
3814 sizeof_ker = sizeof(int16_t) * s->elements;
3817 s->calculate_kernel = gaussian_kernel;
3818 s->remap_slice = depth <= 8 ? remap4_8bit_slice : remap4_16bit_slice;
3819 s->elements = 4 * 4;
3820 sizeof_uv = sizeof(int16_t) * s->elements;
3821 sizeof_ker = sizeof(int16_t) * s->elements;
3827 ff_v360_init(s, depth);
3829 for (int order = 0; order < NB_RORDERS; order++) {
3830 const char c = s->rorder[order];
3834 av_log(ctx, AV_LOG_WARNING,
3835 "Incomplete rorder option. Direction for all 3 rotation orders should be specified. Switching to default rorder.\n");
3836 s->rotation_order[0] = YAW;
3837 s->rotation_order[1] = PITCH;
3838 s->rotation_order[2] = ROLL;
3842 rorder = get_rorder(c);
3844 av_log(ctx, AV_LOG_WARNING,
3845 "Incorrect rotation order symbol '%c' in rorder option. Switching to default rorder.\n", c);
3846 s->rotation_order[0] = YAW;
3847 s->rotation_order[1] = PITCH;
3848 s->rotation_order[2] = ROLL;
3852 s->rotation_order[order] = rorder;
3855 switch (s->in_stereo) {
3859 in_offset_w = in_offset_h = 0;
3877 set_dimensions(s->inplanewidth, s->inplaneheight, w, h, desc);
3878 set_dimensions(s->in_offset_w, s->in_offset_h, in_offset_w, in_offset_h, desc);
3880 s->in_width = s->inplanewidth[0];
3881 s->in_height = s->inplaneheight[0];
3883 if (s->id_fov > 0.f)
3884 fov_from_dfov(s->in, s->id_fov, w, h, &s->ih_fov, &s->iv_fov);
3886 if (s->in_transpose)
3887 FFSWAP(int, s->in_width, s->in_height);
3890 case EQUIRECTANGULAR:
3891 s->in_transform = xyz_to_equirect;
3897 s->in_transform = xyz_to_cube3x2;
3898 err = prepare_cube_in(ctx);
3903 s->in_transform = xyz_to_cube1x6;
3904 err = prepare_cube_in(ctx);
3909 s->in_transform = xyz_to_cube6x1;
3910 err = prepare_cube_in(ctx);
3915 s->in_transform = xyz_to_eac;
3916 err = prepare_eac_in(ctx);
3921 s->in_transform = xyz_to_flat;
3922 err = prepare_flat_in(ctx);
3927 av_log(ctx, AV_LOG_ERROR, "Supplied format is not accepted as input.\n");
3928 return AVERROR(EINVAL);
3930 s->in_transform = xyz_to_dfisheye;
3936 s->in_transform = xyz_to_barrel;
3942 s->in_transform = xyz_to_stereographic;
3943 err = prepare_stereographic_in(ctx);
3948 s->in_transform = xyz_to_mercator;
3954 s->in_transform = xyz_to_ball;
3960 s->in_transform = xyz_to_hammer;
3966 s->in_transform = xyz_to_sinusoidal;
3972 s->in_transform = xyz_to_fisheye;
3973 err = prepare_fisheye_in(ctx);
3978 s->in_transform = xyz_to_pannini;
3984 s->in_transform = xyz_to_cylindrical;
3985 err = prepare_cylindrical_in(ctx);
3990 s->in_transform = xyz_to_tetrahedron;
3996 s->in_transform = xyz_to_barrelsplit;
4002 s->in_transform = xyz_to_tspyramid;
4007 case HEQUIRECTANGULAR:
4008 s->in_transform = xyz_to_hequirect;
4014 av_log(ctx, AV_LOG_ERROR, "Specified input format is not handled.\n");
4023 case EQUIRECTANGULAR:
4024 s->out_transform = equirect_to_xyz;
4030 s->out_transform = cube3x2_to_xyz;
4031 prepare_out = prepare_cube_out;
4032 w = lrintf(wf / 4.f * 3.f);
4036 s->out_transform = cube1x6_to_xyz;
4037 prepare_out = prepare_cube_out;
4038 w = lrintf(wf / 4.f);
4039 h = lrintf(hf * 3.f);
4042 s->out_transform = cube6x1_to_xyz;
4043 prepare_out = prepare_cube_out;
4044 w = lrintf(wf / 2.f * 3.f);
4045 h = lrintf(hf / 2.f);
4048 s->out_transform = eac_to_xyz;
4049 prepare_out = prepare_eac_out;
4051 h = lrintf(hf / 8.f * 9.f);
4054 s->out_transform = flat_to_xyz;
4055 prepare_out = prepare_flat_out;
4060 s->out_transform = dfisheye_to_xyz;
4066 s->out_transform = barrel_to_xyz;
4068 w = lrintf(wf / 4.f * 5.f);
4072 s->out_transform = stereographic_to_xyz;
4073 prepare_out = prepare_stereographic_out;
4075 h = lrintf(hf * 2.f);
4078 s->out_transform = mercator_to_xyz;
4081 h = lrintf(hf * 2.f);
4084 s->out_transform = ball_to_xyz;
4087 h = lrintf(hf * 2.f);
4090 s->out_transform = hammer_to_xyz;
4096 s->out_transform = sinusoidal_to_xyz;
4102 s->out_transform = fisheye_to_xyz;
4103 prepare_out = prepare_fisheye_out;
4104 w = lrintf(wf * 0.5f);
4108 s->out_transform = pannini_to_xyz;
4114 s->out_transform = cylindrical_to_xyz;
4115 prepare_out = prepare_cylindrical_out;
4117 h = lrintf(hf * 0.5f);
4120 s->out_transform = perspective_to_xyz;
4122 w = lrintf(wf / 2.f);
4126 s->out_transform = tetrahedron_to_xyz;
4132 s->out_transform = barrelsplit_to_xyz;
4134 w = lrintf(wf / 4.f * 3.f);
4138 s->out_transform = tspyramid_to_xyz;
4143 case HEQUIRECTANGULAR:
4144 s->out_transform = hequirect_to_xyz;
4146 w = lrintf(wf / 2.f);
4150 av_log(ctx, AV_LOG_ERROR, "Specified output format is not handled.\n");
4154 // Override resolution with user values if specified
4155 if (s->width > 0 && s->height <= 0 && s->h_fov > 0.f && s->v_fov > 0.f &&
4156 s->out == FLAT && s->d_fov == 0.f) {
4158 h = w / tanf(s->h_fov * M_PI / 360.f) * tanf(s->v_fov * M_PI / 360.f);
4159 } else if (s->width <= 0 && s->height > 0 && s->h_fov > 0.f && s->v_fov > 0.f &&
4160 s->out == FLAT && s->d_fov == 0.f) {
4162 w = h / tanf(s->v_fov * M_PI / 360.f) * tanf(s->h_fov * M_PI / 360.f);
4163 } else if (s->width > 0 && s->height > 0) {
4166 } else if (s->width > 0 || s->height > 0) {
4167 av_log(ctx, AV_LOG_ERROR, "Both width and height values should be specified.\n");
4168 return AVERROR(EINVAL);
4170 if (s->out_transpose)
4173 if (s->in_transpose)
4181 fov_from_dfov(s->out, s->d_fov, w, h, &s->h_fov, &s->v_fov);
4184 err = prepare_out(ctx);
4189 set_dimensions(s->pr_width, s->pr_height, w, h, desc);
4191 switch (s->out_stereo) {
4193 out_offset_w = out_offset_h = 0;
4209 set_dimensions(s->out_offset_w, s->out_offset_h, out_offset_w, out_offset_h, desc);
4210 set_dimensions(s->planewidth, s->planeheight, w, h, desc);
4212 for (int i = 0; i < 4; i++)
4213 s->uv_linesize[i] = FFALIGN(s->pr_width[i], 8);
4218 s->nb_planes = av_pix_fmt_count_planes(inlink->format);
4219 have_alpha = !!(desc->flags & AV_PIX_FMT_FLAG_ALPHA);
4221 if (desc->log2_chroma_h == desc->log2_chroma_w && desc->log2_chroma_h == 0) {
4222 s->nb_allocated = 1;
4223 s->map[0] = s->map[1] = s->map[2] = s->map[3] = 0;
4225 s->nb_allocated = 2;
4226 s->map[0] = s->map[3] = 0;
4227 s->map[1] = s->map[2] = 1;
4230 for (int i = 0; i < s->nb_allocated; i++)
4231 allocate_plane(s, sizeof_uv, sizeof_ker, sizeof_mask * have_alpha * s->alpha, i);
4233 calculate_rotation_matrix(s->yaw, s->pitch, s->roll, s->rot_mat, s->rotation_order);
4234 set_mirror_modifier(s->h_flip, s->v_flip, s->d_flip, s->output_mirror_modifier);
4236 ctx->internal->execute(ctx, v360_slice, NULL, NULL, FFMIN(outlink->h, ff_filter_get_nb_threads(ctx)));
4241 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
4243 AVFilterContext *ctx = inlink->dst;
4244 AVFilterLink *outlink = ctx->outputs[0];
4245 V360Context *s = ctx->priv;
4249 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
4252 return AVERROR(ENOMEM);
4254 av_frame_copy_props(out, in);
4259 ctx->internal->execute(ctx, s->remap_slice, &td, NULL, FFMIN(outlink->h, ff_filter_get_nb_threads(ctx)));
4262 return ff_filter_frame(outlink, out);
4265 static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
4266 char *res, int res_len, int flags)
4270 ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags);
4274 return config_output(ctx->outputs[0]);
4277 static av_cold void uninit(AVFilterContext *ctx)
4279 V360Context *s = ctx->priv;
4281 for (int p = 0; p < s->nb_allocated; p++) {
4284 av_freep(&s->ker[p]);
4289 static const AVFilterPad inputs[] = {
4292 .type = AVMEDIA_TYPE_VIDEO,
4293 .filter_frame = filter_frame,
4298 static const AVFilterPad outputs[] = {
4301 .type = AVMEDIA_TYPE_VIDEO,
4302 .config_props = config_output,
4307 AVFilter ff_vf_v360 = {
4309 .description = NULL_IF_CONFIG_SMALL("Convert 360 projection of video."),
4310 .priv_size = sizeof(V360Context),
4312 .query_formats = query_formats,
4315 .priv_class = &v360_class,
4316 .flags = AVFILTER_FLAG_SLICE_THREADS,
4317 .process_command = process_command,