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 {"cylindrical", "cylindrical", 0, AV_OPT_TYPE_CONST, {.i64=CYLINDRICAL}, 0, 0, FLAGS, "in" },
78 {"tetrahedron", "tetrahedron", 0, AV_OPT_TYPE_CONST, {.i64=TETRAHEDRON}, 0, 0, FLAGS, "in" },
79 {"barrelsplit", "barrel split facebook's 360 format", 0, AV_OPT_TYPE_CONST, {.i64=BARREL_SPLIT}, 0, 0, FLAGS, "in" },
80 { "output", "set output projection", OFFSET(out), AV_OPT_TYPE_INT, {.i64=CUBEMAP_3_2}, 0, NB_PROJECTIONS-1, FLAGS, "out" },
81 { "e", "equirectangular", 0, AV_OPT_TYPE_CONST, {.i64=EQUIRECTANGULAR}, 0, 0, FLAGS, "out" },
82 { "equirect", "equirectangular", 0, AV_OPT_TYPE_CONST, {.i64=EQUIRECTANGULAR}, 0, 0, FLAGS, "out" },
83 { "c3x2", "cubemap 3x2", 0, AV_OPT_TYPE_CONST, {.i64=CUBEMAP_3_2}, 0, 0, FLAGS, "out" },
84 { "c6x1", "cubemap 6x1", 0, AV_OPT_TYPE_CONST, {.i64=CUBEMAP_6_1}, 0, 0, FLAGS, "out" },
85 { "eac", "equi-angular cubemap", 0, AV_OPT_TYPE_CONST, {.i64=EQUIANGULAR}, 0, 0, FLAGS, "out" },
86 { "dfisheye", "dual fisheye", 0, AV_OPT_TYPE_CONST, {.i64=DUAL_FISHEYE}, 0, 0, FLAGS, "out" },
87 { "flat", "regular video", 0, AV_OPT_TYPE_CONST, {.i64=FLAT}, 0, 0, FLAGS, "out" },
88 {"rectilinear", "regular video", 0, AV_OPT_TYPE_CONST, {.i64=FLAT}, 0, 0, FLAGS, "out" },
89 { "gnomonic", "regular video", 0, AV_OPT_TYPE_CONST, {.i64=FLAT}, 0, 0, FLAGS, "out" },
90 { "barrel", "barrel facebook's 360 format", 0, AV_OPT_TYPE_CONST, {.i64=BARREL}, 0, 0, FLAGS, "out" },
91 { "fb", "barrel facebook's 360 format", 0, AV_OPT_TYPE_CONST, {.i64=BARREL}, 0, 0, FLAGS, "out" },
92 { "c1x6", "cubemap 1x6", 0, AV_OPT_TYPE_CONST, {.i64=CUBEMAP_1_6}, 0, 0, FLAGS, "out" },
93 { "sg", "stereographic", 0, AV_OPT_TYPE_CONST, {.i64=STEREOGRAPHIC}, 0, 0, FLAGS, "out" },
94 { "mercator", "mercator", 0, AV_OPT_TYPE_CONST, {.i64=MERCATOR}, 0, 0, FLAGS, "out" },
95 { "ball", "ball", 0, AV_OPT_TYPE_CONST, {.i64=BALL}, 0, 0, FLAGS, "out" },
96 { "hammer", "hammer", 0, AV_OPT_TYPE_CONST, {.i64=HAMMER}, 0, 0, FLAGS, "out" },
97 {"sinusoidal", "sinusoidal", 0, AV_OPT_TYPE_CONST, {.i64=SINUSOIDAL}, 0, 0, FLAGS, "out" },
98 { "fisheye", "fisheye", 0, AV_OPT_TYPE_CONST, {.i64=FISHEYE}, 0, 0, FLAGS, "out" },
99 { "pannini", "pannini", 0, AV_OPT_TYPE_CONST, {.i64=PANNINI}, 0, 0, FLAGS, "out" },
100 {"cylindrical", "cylindrical", 0, AV_OPT_TYPE_CONST, {.i64=CYLINDRICAL}, 0, 0, FLAGS, "out" },
101 {"perspective", "perspective", 0, AV_OPT_TYPE_CONST, {.i64=PERSPECTIVE}, 0, 0, FLAGS, "out" },
102 {"tetrahedron", "tetrahedron", 0, AV_OPT_TYPE_CONST, {.i64=TETRAHEDRON}, 0, 0, FLAGS, "out" },
103 {"barrelsplit", "barrel split facebook's 360 format", 0, AV_OPT_TYPE_CONST, {.i64=BARREL_SPLIT}, 0, 0, FLAGS, "out" },
104 { "interp", "set interpolation method", OFFSET(interp), AV_OPT_TYPE_INT, {.i64=BILINEAR}, 0, NB_INTERP_METHODS-1, FLAGS, "interp" },
105 { "near", "nearest neighbour", 0, AV_OPT_TYPE_CONST, {.i64=NEAREST}, 0, 0, FLAGS, "interp" },
106 { "nearest", "nearest neighbour", 0, AV_OPT_TYPE_CONST, {.i64=NEAREST}, 0, 0, FLAGS, "interp" },
107 { "line", "bilinear interpolation", 0, AV_OPT_TYPE_CONST, {.i64=BILINEAR}, 0, 0, FLAGS, "interp" },
108 { "linear", "bilinear interpolation", 0, AV_OPT_TYPE_CONST, {.i64=BILINEAR}, 0, 0, FLAGS, "interp" },
109 { "cube", "bicubic interpolation", 0, AV_OPT_TYPE_CONST, {.i64=BICUBIC}, 0, 0, FLAGS, "interp" },
110 { "cubic", "bicubic interpolation", 0, AV_OPT_TYPE_CONST, {.i64=BICUBIC}, 0, 0, FLAGS, "interp" },
111 { "lanc", "lanczos interpolation", 0, AV_OPT_TYPE_CONST, {.i64=LANCZOS}, 0, 0, FLAGS, "interp" },
112 { "lanczos", "lanczos interpolation", 0, AV_OPT_TYPE_CONST, {.i64=LANCZOS}, 0, 0, FLAGS, "interp" },
113 { "sp16", "spline16 interpolation", 0, AV_OPT_TYPE_CONST, {.i64=SPLINE16}, 0, 0, FLAGS, "interp" },
114 { "spline16", "spline16 interpolation", 0, AV_OPT_TYPE_CONST, {.i64=SPLINE16}, 0, 0, FLAGS, "interp" },
115 { "gauss", "gaussian interpolation", 0, AV_OPT_TYPE_CONST, {.i64=GAUSSIAN}, 0, 0, FLAGS, "interp" },
116 { "gaussian", "gaussian interpolation", 0, AV_OPT_TYPE_CONST, {.i64=GAUSSIAN}, 0, 0, FLAGS, "interp" },
117 { "w", "output width", OFFSET(width), AV_OPT_TYPE_INT, {.i64=0}, 0, INT16_MAX, FLAGS, "w"},
118 { "h", "output height", OFFSET(height), AV_OPT_TYPE_INT, {.i64=0}, 0, INT16_MAX, FLAGS, "h"},
119 { "in_stereo", "input stereo format", OFFSET(in_stereo), AV_OPT_TYPE_INT, {.i64=STEREO_2D}, 0, NB_STEREO_FMTS-1, FLAGS, "stereo" },
120 {"out_stereo", "output stereo format", OFFSET(out_stereo), AV_OPT_TYPE_INT, {.i64=STEREO_2D}, 0, NB_STEREO_FMTS-1, FLAGS, "stereo" },
121 { "2d", "2d mono", 0, AV_OPT_TYPE_CONST, {.i64=STEREO_2D}, 0, 0, FLAGS, "stereo" },
122 { "sbs", "side by side", 0, AV_OPT_TYPE_CONST, {.i64=STEREO_SBS}, 0, 0, FLAGS, "stereo" },
123 { "tb", "top bottom", 0, AV_OPT_TYPE_CONST, {.i64=STEREO_TB}, 0, 0, FLAGS, "stereo" },
124 { "in_forder", "input cubemap face order", OFFSET(in_forder), AV_OPT_TYPE_STRING, {.str="rludfb"}, 0, NB_DIRECTIONS-1, FLAGS, "in_forder"},
125 {"out_forder", "output cubemap face order", OFFSET(out_forder), AV_OPT_TYPE_STRING, {.str="rludfb"}, 0, NB_DIRECTIONS-1, FLAGS, "out_forder"},
126 { "in_frot", "input cubemap face rotation", OFFSET(in_frot), AV_OPT_TYPE_STRING, {.str="000000"}, 0, NB_DIRECTIONS-1, FLAGS, "in_frot"},
127 { "out_frot", "output cubemap face rotation",OFFSET(out_frot), AV_OPT_TYPE_STRING, {.str="000000"}, 0, NB_DIRECTIONS-1, FLAGS, "out_frot"},
128 { "in_pad", "percent input cubemap pads", OFFSET(in_pad), AV_OPT_TYPE_FLOAT, {.dbl=0.f}, 0.f, 1.f,TFLAGS, "in_pad"},
129 { "out_pad", "percent output cubemap pads", OFFSET(out_pad), AV_OPT_TYPE_FLOAT, {.dbl=0.f}, 0.f, 1.f,TFLAGS, "out_pad"},
130 { "fin_pad", "fixed input cubemap pads", OFFSET(fin_pad), AV_OPT_TYPE_INT, {.i64=0}, 0, 100,TFLAGS, "fin_pad"},
131 { "fout_pad", "fixed output cubemap pads", OFFSET(fout_pad), AV_OPT_TYPE_INT, {.i64=0}, 0, 100,TFLAGS, "fout_pad"},
132 { "yaw", "yaw rotation", OFFSET(yaw), AV_OPT_TYPE_FLOAT, {.dbl=0.f}, -180.f, 180.f,TFLAGS, "yaw"},
133 { "pitch", "pitch rotation", OFFSET(pitch), AV_OPT_TYPE_FLOAT, {.dbl=0.f}, -180.f, 180.f,TFLAGS, "pitch"},
134 { "roll", "roll rotation", OFFSET(roll), AV_OPT_TYPE_FLOAT, {.dbl=0.f}, -180.f, 180.f,TFLAGS, "roll"},
135 { "rorder", "rotation order", OFFSET(rorder), AV_OPT_TYPE_STRING, {.str="ypr"}, 0, 0,TFLAGS, "rorder"},
136 { "h_fov", "horizontal field of view", OFFSET(h_fov), AV_OPT_TYPE_FLOAT, {.dbl=90.f}, 0.00001f, 360.f,TFLAGS, "h_fov"},
137 { "v_fov", "vertical field of view", OFFSET(v_fov), AV_OPT_TYPE_FLOAT, {.dbl=45.f}, 0.00001f, 360.f,TFLAGS, "v_fov"},
138 { "d_fov", "diagonal field of view", OFFSET(d_fov), AV_OPT_TYPE_FLOAT, {.dbl=0.f}, 0.f, 360.f,TFLAGS, "d_fov"},
139 { "h_flip", "flip out video horizontally", OFFSET(h_flip), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1,TFLAGS, "h_flip"},
140 { "v_flip", "flip out video vertically", OFFSET(v_flip), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1,TFLAGS, "v_flip"},
141 { "d_flip", "flip out video indepth", OFFSET(d_flip), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1,TFLAGS, "d_flip"},
142 { "ih_flip", "flip in video horizontally", OFFSET(ih_flip), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1,TFLAGS, "ih_flip"},
143 { "iv_flip", "flip in video vertically", OFFSET(iv_flip), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1,TFLAGS, "iv_flip"},
144 { "in_trans", "transpose video input", OFFSET(in_transpose), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS, "in_transpose"},
145 { "out_trans", "transpose video output", OFFSET(out_transpose), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS, "out_transpose"},
146 { "ih_fov", "input horizontal field of view",OFFSET(ih_fov), AV_OPT_TYPE_FLOAT, {.dbl=90.f}, 0.00001f, 360.f,TFLAGS, "ih_fov"},
147 { "iv_fov", "input vertical field of view", OFFSET(iv_fov), AV_OPT_TYPE_FLOAT, {.dbl=45.f}, 0.00001f, 360.f,TFLAGS, "iv_fov"},
148 { "id_fov", "input diagonal field of view", OFFSET(id_fov), AV_OPT_TYPE_FLOAT, {.dbl=0.f}, 0.f, 360.f,TFLAGS, "id_fov"},
149 {"alpha_mask", "build mask in alpha plane", OFFSET(alpha), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS, "alpha"},
153 AVFILTER_DEFINE_CLASS(v360);
155 static int query_formats(AVFilterContext *ctx)
157 V360Context *s = ctx->priv;
158 static const enum AVPixelFormat pix_fmts[] = {
160 AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA444P9,
161 AV_PIX_FMT_YUVA444P10, AV_PIX_FMT_YUVA444P12,
162 AV_PIX_FMT_YUVA444P16,
165 AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA422P9,
166 AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA422P12,
167 AV_PIX_FMT_YUVA422P16,
170 AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA420P9,
171 AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA420P16,
174 AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,
175 AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
179 AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV444P9,
180 AV_PIX_FMT_YUV444P10, AV_PIX_FMT_YUV444P12,
181 AV_PIX_FMT_YUV444P14, AV_PIX_FMT_YUV444P16,
184 AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV440P10,
185 AV_PIX_FMT_YUV440P12,
188 AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV422P9,
189 AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV422P12,
190 AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV422P16,
193 AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV420P9,
194 AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV420P12,
195 AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV420P16,
204 AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRP9,
205 AV_PIX_FMT_GBRP10, AV_PIX_FMT_GBRP12,
206 AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,
209 AV_PIX_FMT_GBRAP, AV_PIX_FMT_GBRAP10,
210 AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRAP16,
213 AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY9,
214 AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12,
215 AV_PIX_FMT_GRAY14, AV_PIX_FMT_GRAY16,
219 static const enum AVPixelFormat alpha_pix_fmts[] = {
220 AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA444P9,
221 AV_PIX_FMT_YUVA444P10, AV_PIX_FMT_YUVA444P12,
222 AV_PIX_FMT_YUVA444P16,
223 AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA422P9,
224 AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA422P12,
225 AV_PIX_FMT_YUVA422P16,
226 AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA420P9,
227 AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA420P16,
228 AV_PIX_FMT_GBRAP, AV_PIX_FMT_GBRAP10,
229 AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRAP16,
233 AVFilterFormats *fmts_list = ff_make_format_list(s->alpha ? alpha_pix_fmts : pix_fmts);
235 return AVERROR(ENOMEM);
236 return ff_set_common_formats(ctx, fmts_list);
239 #define DEFINE_REMAP1_LINE(bits, div) \
240 static void remap1_##bits##bit_line_c(uint8_t *dst, int width, const uint8_t *const src, \
241 ptrdiff_t in_linesize, \
242 const int16_t *const u, const int16_t *const v, \
243 const int16_t *const ker) \
245 const uint##bits##_t *const s = (const uint##bits##_t *const)src; \
246 uint##bits##_t *d = (uint##bits##_t *)dst; \
248 in_linesize /= div; \
250 for (int x = 0; x < width; x++) \
251 d[x] = s[v[x] * in_linesize + u[x]]; \
254 DEFINE_REMAP1_LINE( 8, 1)
255 DEFINE_REMAP1_LINE(16, 2)
258 * Generate remapping function with a given window size and pixel depth.
260 * @param ws size of interpolation window
261 * @param bits number of bits per pixel
263 #define DEFINE_REMAP(ws, bits) \
264 static int remap##ws##_##bits##bit_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs) \
266 ThreadData *td = arg; \
267 const V360Context *s = ctx->priv; \
268 const AVFrame *in = td->in; \
269 AVFrame *out = td->out; \
271 for (int stereo = 0; stereo < 1 + s->out_stereo > STEREO_2D; stereo++) { \
272 for (int plane = 0; plane < s->nb_planes; plane++) { \
273 const unsigned map = s->map[plane]; \
274 const int in_linesize = in->linesize[plane]; \
275 const int out_linesize = out->linesize[plane]; \
276 const int uv_linesize = s->uv_linesize[plane]; \
277 const int in_offset_w = stereo ? s->in_offset_w[plane] : 0; \
278 const int in_offset_h = stereo ? s->in_offset_h[plane] : 0; \
279 const int out_offset_w = stereo ? s->out_offset_w[plane] : 0; \
280 const int out_offset_h = stereo ? s->out_offset_h[plane] : 0; \
281 const uint8_t *const src = in->data[plane] + \
282 in_offset_h * in_linesize + in_offset_w * (bits >> 3); \
283 uint8_t *dst = out->data[plane] + out_offset_h * out_linesize + out_offset_w * (bits >> 3); \
284 const uint8_t *mask = plane == 3 ? s->mask : NULL; \
285 const int width = s->pr_width[plane]; \
286 const int height = s->pr_height[plane]; \
288 const int slice_start = (height * jobnr ) / nb_jobs; \
289 const int slice_end = (height * (jobnr + 1)) / nb_jobs; \
291 for (int y = slice_start; y < slice_end && !mask; y++) { \
292 const int16_t *const u = s->u[map] + y * uv_linesize * ws * ws; \
293 const int16_t *const v = s->v[map] + y * uv_linesize * ws * ws; \
294 const int16_t *const ker = s->ker[map] + y * uv_linesize * ws * ws; \
296 s->remap_line(dst + y * out_linesize, width, src, in_linesize, u, v, ker); \
299 for (int y = slice_start; y < slice_end && mask; y++) { \
300 memcpy(dst + y * out_linesize, mask + y * width * (bits >> 3), width * (bits >> 3)); \
315 #define DEFINE_REMAP_LINE(ws, bits, div) \
316 static void remap##ws##_##bits##bit_line_c(uint8_t *dst, int width, const uint8_t *const src, \
317 ptrdiff_t in_linesize, \
318 const int16_t *const u, const int16_t *const v, \
319 const int16_t *const ker) \
321 const uint##bits##_t *const s = (const uint##bits##_t *const)src; \
322 uint##bits##_t *d = (uint##bits##_t *)dst; \
324 in_linesize /= div; \
326 for (int x = 0; x < width; x++) { \
327 const int16_t *const uu = u + x * ws * ws; \
328 const int16_t *const vv = v + x * ws * ws; \
329 const int16_t *const kker = ker + x * ws * ws; \
332 for (int i = 0; i < ws; i++) { \
333 for (int j = 0; j < ws; j++) { \
334 tmp += kker[i * ws + j] * s[vv[i * ws + j] * in_linesize + uu[i * ws + j]]; \
338 d[x] = av_clip_uint##bits(tmp >> 14); \
342 DEFINE_REMAP_LINE(2, 8, 1)
343 DEFINE_REMAP_LINE(4, 8, 1)
344 DEFINE_REMAP_LINE(2, 16, 2)
345 DEFINE_REMAP_LINE(4, 16, 2)
347 void ff_v360_init(V360Context *s, int depth)
351 s->remap_line = depth <= 8 ? remap1_8bit_line_c : remap1_16bit_line_c;
354 s->remap_line = depth <= 8 ? remap2_8bit_line_c : remap2_16bit_line_c;
360 s->remap_line = depth <= 8 ? remap4_8bit_line_c : remap4_16bit_line_c;
365 ff_v360_init_x86(s, depth);
369 * Save nearest pixel coordinates for remapping.
371 * @param du horizontal relative coordinate
372 * @param dv vertical relative coordinate
373 * @param rmap calculated 4x4 window
374 * @param u u remap data
375 * @param v v remap data
376 * @param ker ker remap data
378 static void nearest_kernel(float du, float dv, const XYRemap *rmap,
379 int16_t *u, int16_t *v, int16_t *ker)
381 const int i = lrintf(dv) + 1;
382 const int j = lrintf(du) + 1;
384 u[0] = rmap->u[i][j];
385 v[0] = rmap->v[i][j];
389 * Calculate kernel for bilinear interpolation.
391 * @param du horizontal relative coordinate
392 * @param dv vertical relative coordinate
393 * @param rmap calculated 4x4 window
394 * @param u u remap data
395 * @param v v remap data
396 * @param ker ker remap data
398 static void bilinear_kernel(float du, float dv, const XYRemap *rmap,
399 int16_t *u, int16_t *v, int16_t *ker)
401 for (int i = 0; i < 2; i++) {
402 for (int j = 0; j < 2; j++) {
403 u[i * 2 + j] = rmap->u[i + 1][j + 1];
404 v[i * 2 + j] = rmap->v[i + 1][j + 1];
408 ker[0] = lrintf((1.f - du) * (1.f - dv) * 16385.f);
409 ker[1] = lrintf( du * (1.f - dv) * 16385.f);
410 ker[2] = lrintf((1.f - du) * dv * 16385.f);
411 ker[3] = lrintf( du * dv * 16385.f);
415 * Calculate 1-dimensional cubic coefficients.
417 * @param t relative coordinate
418 * @param coeffs coefficients
420 static inline void calculate_bicubic_coeffs(float t, float *coeffs)
422 const float tt = t * t;
423 const float ttt = t * t * t;
425 coeffs[0] = - t / 3.f + tt / 2.f - ttt / 6.f;
426 coeffs[1] = 1.f - t / 2.f - tt + ttt / 2.f;
427 coeffs[2] = t + tt / 2.f - ttt / 2.f;
428 coeffs[3] = - t / 6.f + ttt / 6.f;
432 * Calculate kernel for bicubic interpolation.
434 * @param du horizontal relative coordinate
435 * @param dv vertical relative coordinate
436 * @param rmap calculated 4x4 window
437 * @param u u remap data
438 * @param v v remap data
439 * @param ker ker remap data
441 static void bicubic_kernel(float du, float dv, const XYRemap *rmap,
442 int16_t *u, int16_t *v, int16_t *ker)
447 calculate_bicubic_coeffs(du, du_coeffs);
448 calculate_bicubic_coeffs(dv, dv_coeffs);
450 for (int i = 0; i < 4; i++) {
451 for (int j = 0; j < 4; j++) {
452 u[i * 4 + j] = rmap->u[i][j];
453 v[i * 4 + j] = rmap->v[i][j];
454 ker[i * 4 + j] = lrintf(du_coeffs[j] * dv_coeffs[i] * 16385.f);
460 * Calculate 1-dimensional lanczos coefficients.
462 * @param t relative coordinate
463 * @param coeffs coefficients
465 static inline void calculate_lanczos_coeffs(float t, float *coeffs)
469 for (int i = 0; i < 4; i++) {
470 const float x = M_PI * (t - i + 1);
474 coeffs[i] = sinf(x) * sinf(x / 2.f) / (x * x / 2.f);
479 for (int i = 0; i < 4; i++) {
485 * Calculate kernel for lanczos interpolation.
487 * @param du horizontal relative coordinate
488 * @param dv vertical relative coordinate
489 * @param rmap calculated 4x4 window
490 * @param u u remap data
491 * @param v v remap data
492 * @param ker ker remap data
494 static void lanczos_kernel(float du, float dv, const XYRemap *rmap,
495 int16_t *u, int16_t *v, int16_t *ker)
500 calculate_lanczos_coeffs(du, du_coeffs);
501 calculate_lanczos_coeffs(dv, dv_coeffs);
503 for (int i = 0; i < 4; i++) {
504 for (int j = 0; j < 4; j++) {
505 u[i * 4 + j] = rmap->u[i][j];
506 v[i * 4 + j] = rmap->v[i][j];
507 ker[i * 4 + j] = lrintf(du_coeffs[j] * dv_coeffs[i] * 16385.f);
513 * Calculate 1-dimensional spline16 coefficients.
515 * @param t relative coordinate
516 * @param coeffs coefficients
518 static void calculate_spline16_coeffs(float t, float *coeffs)
520 coeffs[0] = ((-1.f / 3.f * t + 0.8f) * t - 7.f / 15.f) * t;
521 coeffs[1] = ((t - 9.f / 5.f) * t - 0.2f) * t + 1.f;
522 coeffs[2] = ((6.f / 5.f - t) * t + 0.8f) * t;
523 coeffs[3] = ((1.f / 3.f * t - 0.2f) * t - 2.f / 15.f) * t;
527 * Calculate kernel for spline16 interpolation.
529 * @param du horizontal relative coordinate
530 * @param dv vertical relative coordinate
531 * @param rmap calculated 4x4 window
532 * @param u u remap data
533 * @param v v remap data
534 * @param ker ker remap data
536 static void spline16_kernel(float du, float dv, const XYRemap *rmap,
537 int16_t *u, int16_t *v, int16_t *ker)
542 calculate_spline16_coeffs(du, du_coeffs);
543 calculate_spline16_coeffs(dv, dv_coeffs);
545 for (int i = 0; i < 4; i++) {
546 for (int j = 0; j < 4; j++) {
547 u[i * 4 + j] = rmap->u[i][j];
548 v[i * 4 + j] = rmap->v[i][j];
549 ker[i * 4 + j] = lrintf(du_coeffs[j] * dv_coeffs[i] * 16385.f);
555 * Calculate 1-dimensional gaussian coefficients.
557 * @param t relative coordinate
558 * @param coeffs coefficients
560 static void calculate_gaussian_coeffs(float t, float *coeffs)
564 for (int i = 0; i < 4; i++) {
565 const float x = t - (i - 1);
569 coeffs[i] = expf(-2.f * x * x) * expf(-x * x / 2.f);
574 for (int i = 0; i < 4; i++) {
580 * Calculate kernel for gaussian interpolation.
582 * @param du horizontal relative coordinate
583 * @param dv vertical relative coordinate
584 * @param rmap calculated 4x4 window
585 * @param u u remap data
586 * @param v v remap data
587 * @param ker ker remap data
589 static void gaussian_kernel(float du, float dv, const XYRemap *rmap,
590 int16_t *u, int16_t *v, int16_t *ker)
595 calculate_gaussian_coeffs(du, du_coeffs);
596 calculate_gaussian_coeffs(dv, dv_coeffs);
598 for (int i = 0; i < 4; i++) {
599 for (int j = 0; j < 4; j++) {
600 u[i * 4 + j] = rmap->u[i][j];
601 v[i * 4 + j] = rmap->v[i][j];
602 ker[i * 4 + j] = lrintf(du_coeffs[j] * dv_coeffs[i] * 16385.f);
608 * Modulo operation with only positive remainders.
613 * @return positive remainder of (a / b)
615 static inline int mod(int a, int b)
617 const int res = a % b;
626 * Reflect y operation.
628 * @param y input vertical position
629 * @param h input height
631 static inline int reflecty(int y, int h)
636 return 2 * h - 1 - y;
643 * Reflect x operation.
645 * @param x input horizontal position
646 * @param y input vertical position
647 * @param w input width
648 * @param h input height
650 static inline int reflectx(int x, int y, int w, int h)
659 * Convert char to corresponding direction.
660 * Used for cubemap options.
662 static int get_direction(char c)
683 * Convert char to corresponding rotation angle.
684 * Used for cubemap options.
686 static int get_rotation(char c)
703 * Convert char to corresponding rotation order.
705 static int get_rorder(char c)
723 * Prepare data for processing cubemap input format.
725 * @param ctx filter context
729 static int prepare_cube_in(AVFilterContext *ctx)
731 V360Context *s = ctx->priv;
733 for (int face = 0; face < NB_FACES; face++) {
734 const char c = s->in_forder[face];
738 av_log(ctx, AV_LOG_ERROR,
739 "Incomplete in_forder option. Direction for all 6 faces should be specified.\n");
740 return AVERROR(EINVAL);
743 direction = get_direction(c);
744 if (direction == -1) {
745 av_log(ctx, AV_LOG_ERROR,
746 "Incorrect direction symbol '%c' in in_forder option.\n", c);
747 return AVERROR(EINVAL);
750 s->in_cubemap_face_order[direction] = face;
753 for (int face = 0; face < NB_FACES; face++) {
754 const char c = s->in_frot[face];
758 av_log(ctx, AV_LOG_ERROR,
759 "Incomplete in_frot option. Rotation for all 6 faces should be specified.\n");
760 return AVERROR(EINVAL);
763 rotation = get_rotation(c);
764 if (rotation == -1) {
765 av_log(ctx, AV_LOG_ERROR,
766 "Incorrect rotation symbol '%c' in in_frot option.\n", c);
767 return AVERROR(EINVAL);
770 s->in_cubemap_face_rotation[face] = rotation;
777 * Prepare data for processing cubemap output format.
779 * @param ctx filter context
783 static int prepare_cube_out(AVFilterContext *ctx)
785 V360Context *s = ctx->priv;
787 for (int face = 0; face < NB_FACES; face++) {
788 const char c = s->out_forder[face];
792 av_log(ctx, AV_LOG_ERROR,
793 "Incomplete out_forder option. Direction for all 6 faces should be specified.\n");
794 return AVERROR(EINVAL);
797 direction = get_direction(c);
798 if (direction == -1) {
799 av_log(ctx, AV_LOG_ERROR,
800 "Incorrect direction symbol '%c' in out_forder option.\n", c);
801 return AVERROR(EINVAL);
804 s->out_cubemap_direction_order[face] = direction;
807 for (int face = 0; face < NB_FACES; face++) {
808 const char c = s->out_frot[face];
812 av_log(ctx, AV_LOG_ERROR,
813 "Incomplete out_frot option. Rotation for all 6 faces should be specified.\n");
814 return AVERROR(EINVAL);
817 rotation = get_rotation(c);
818 if (rotation == -1) {
819 av_log(ctx, AV_LOG_ERROR,
820 "Incorrect rotation symbol '%c' in out_frot option.\n", c);
821 return AVERROR(EINVAL);
824 s->out_cubemap_face_rotation[face] = rotation;
830 static inline void rotate_cube_face(float *uf, float *vf, int rotation)
856 static inline void rotate_cube_face_inverse(float *uf, float *vf, int rotation)
887 static void normalize_vector(float *vec)
889 const float norm = sqrtf(vec[0] * vec[0] + vec[1] * vec[1] + vec[2] * vec[2]);
897 * Calculate 3D coordinates on sphere for corresponding cubemap position.
898 * Common operation for every cubemap.
900 * @param s filter private context
901 * @param uf horizontal cubemap coordinate [0, 1)
902 * @param vf vertical cubemap coordinate [0, 1)
903 * @param face face of cubemap
904 * @param vec coordinates on sphere
905 * @param scalew scale for uf
906 * @param scaleh scale for vf
908 static void cube_to_xyz(const V360Context *s,
909 float uf, float vf, int face,
910 float *vec, float scalew, float scaleh)
912 const int direction = s->out_cubemap_direction_order[face];
918 rotate_cube_face_inverse(&uf, &vf, s->out_cubemap_face_rotation[face]);
959 normalize_vector(vec);
963 * Calculate cubemap position for corresponding 3D coordinates on sphere.
964 * Common operation for every cubemap.
966 * @param s filter private context
967 * @param vec coordinated on sphere
968 * @param uf horizontal cubemap coordinate [0, 1)
969 * @param vf vertical cubemap coordinate [0, 1)
970 * @param direction direction of view
972 static void xyz_to_cube(const V360Context *s,
974 float *uf, float *vf, int *direction)
976 const float phi = atan2f(vec[0], -vec[2]);
977 const float theta = asinf(-vec[1]);
978 float phi_norm, theta_threshold;
981 if (phi >= -M_PI_4 && phi < M_PI_4) {
984 } else if (phi >= -(M_PI_2 + M_PI_4) && phi < -M_PI_4) {
986 phi_norm = phi + M_PI_2;
987 } else if (phi >= M_PI_4 && phi < M_PI_2 + M_PI_4) {
989 phi_norm = phi - M_PI_2;
992 phi_norm = phi + ((phi > 0.f) ? -M_PI : M_PI);
995 theta_threshold = atanf(cosf(phi_norm));
996 if (theta > theta_threshold) {
998 } else if (theta < -theta_threshold) {
1002 switch (*direction) {
1004 *uf = vec[2] / vec[0];
1005 *vf = -vec[1] / vec[0];
1008 *uf = vec[2] / vec[0];
1009 *vf = vec[1] / vec[0];
1012 *uf = vec[0] / vec[1];
1013 *vf = -vec[2] / vec[1];
1016 *uf = -vec[0] / vec[1];
1017 *vf = -vec[2] / vec[1];
1020 *uf = -vec[0] / vec[2];
1021 *vf = vec[1] / vec[2];
1024 *uf = -vec[0] / vec[2];
1025 *vf = -vec[1] / vec[2];
1031 face = s->in_cubemap_face_order[*direction];
1032 rotate_cube_face(uf, vf, s->in_cubemap_face_rotation[face]);
1034 (*uf) *= s->input_mirror_modifier[0];
1035 (*vf) *= s->input_mirror_modifier[1];
1039 * Find position on another cube face in case of overflow/underflow.
1040 * Used for calculation of interpolation window.
1042 * @param s filter private context
1043 * @param uf horizontal cubemap coordinate
1044 * @param vf vertical cubemap coordinate
1045 * @param direction direction of view
1046 * @param new_uf new horizontal cubemap coordinate
1047 * @param new_vf new vertical cubemap coordinate
1048 * @param face face position on cubemap
1050 static void process_cube_coordinates(const V360Context *s,
1051 float uf, float vf, int direction,
1052 float *new_uf, float *new_vf, int *face)
1055 * Cubemap orientation
1062 * +-------+-------+-------+-------+ ^ e |
1064 * | left | front | right | back | | g |
1065 * +-------+-------+-------+-------+ v h v
1071 *face = s->in_cubemap_face_order[direction];
1072 rotate_cube_face_inverse(&uf, &vf, s->in_cubemap_face_rotation[*face]);
1074 if ((uf < -1.f || uf >= 1.f) && (vf < -1.f || vf >= 1.f)) {
1075 // There are no pixels to use in this case
1078 } else if (uf < -1.f) {
1080 switch (direction) {
1114 } else if (uf >= 1.f) {
1116 switch (direction) {
1150 } else if (vf < -1.f) {
1152 switch (direction) {
1186 } else if (vf >= 1.f) {
1188 switch (direction) {
1228 *face = s->in_cubemap_face_order[direction];
1229 rotate_cube_face(new_uf, new_vf, s->in_cubemap_face_rotation[*face]);
1233 * Calculate 3D coordinates on sphere for corresponding frame position in cubemap3x2 format.
1235 * @param s filter private context
1236 * @param i horizontal position on frame [0, width)
1237 * @param j vertical position on frame [0, height)
1238 * @param width frame width
1239 * @param height frame height
1240 * @param vec coordinates on sphere
1242 static int cube3x2_to_xyz(const V360Context *s,
1243 int i, int j, int width, int height,
1246 const float scalew = s->fout_pad > 0 ? 1.f - s->fout_pad / (s->out_width / 3.f) : 1.f - s->out_pad;
1247 const float scaleh = s->fout_pad > 0 ? 1.f - s->fout_pad / (s->out_height / 2.f) : 1.f - s->out_pad;
1249 const float ew = width / 3.f;
1250 const float eh = height / 2.f;
1252 const int u_face = floorf(i / ew);
1253 const int v_face = floorf(j / eh);
1254 const int face = u_face + 3 * v_face;
1256 const int u_shift = ceilf(ew * u_face);
1257 const int v_shift = ceilf(eh * v_face);
1258 const int ewi = ceilf(ew * (u_face + 1)) - u_shift;
1259 const int ehi = ceilf(eh * (v_face + 1)) - v_shift;
1261 const float uf = 2.f * (i - u_shift + 0.5f) / ewi - 1.f;
1262 const float vf = 2.f * (j - v_shift + 0.5f) / ehi - 1.f;
1264 cube_to_xyz(s, uf, vf, face, vec, scalew, scaleh);
1270 * Calculate frame position in cubemap3x2 format for corresponding 3D coordinates on sphere.
1272 * @param s filter private context
1273 * @param vec coordinates on sphere
1274 * @param width frame width
1275 * @param height frame height
1276 * @param us horizontal coordinates for interpolation window
1277 * @param vs vertical coordinates for interpolation window
1278 * @param du horizontal relative coordinate
1279 * @param dv vertical relative coordinate
1281 static int xyz_to_cube3x2(const V360Context *s,
1282 const float *vec, int width, int height,
1283 int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
1285 const float scalew = s->fin_pad > 0 ? 1.f - s->fin_pad / (s->in_width / 3.f) : 1.f - s->in_pad;
1286 const float scaleh = s->fin_pad > 0 ? 1.f - s->fin_pad / (s->in_height / 2.f) : 1.f - s->in_pad;
1287 const float ew = width / 3.f;
1288 const float eh = height / 2.f;
1292 int direction, face;
1295 xyz_to_cube(s, vec, &uf, &vf, &direction);
1300 face = s->in_cubemap_face_order[direction];
1303 ewi = ceilf(ew * (u_face + 1)) - ceilf(ew * u_face);
1304 ehi = ceilf(eh * (v_face + 1)) - ceilf(eh * v_face);
1306 uf = 0.5f * ewi * (uf + 1.f) - 0.5f;
1307 vf = 0.5f * ehi * (vf + 1.f) - 0.5f;
1315 for (int i = 0; i < 4; i++) {
1316 for (int j = 0; j < 4; j++) {
1317 int new_ui = ui + j - 1;
1318 int new_vi = vi + i - 1;
1319 int u_shift, v_shift;
1320 int new_ewi, new_ehi;
1322 if (new_ui >= 0 && new_ui < ewi && new_vi >= 0 && new_vi < ehi) {
1323 face = s->in_cubemap_face_order[direction];
1327 u_shift = ceilf(ew * u_face);
1328 v_shift = ceilf(eh * v_face);
1330 uf = 2.f * new_ui / ewi - 1.f;
1331 vf = 2.f * new_vi / ehi - 1.f;
1336 process_cube_coordinates(s, uf, vf, direction, &uf, &vf, &face);
1343 u_shift = ceilf(ew * u_face);
1344 v_shift = ceilf(eh * v_face);
1345 new_ewi = ceilf(ew * (u_face + 1)) - u_shift;
1346 new_ehi = ceilf(eh * (v_face + 1)) - v_shift;
1348 new_ui = av_clip(lrintf(0.5f * new_ewi * (uf + 1.f)), 0, new_ewi - 1);
1349 new_vi = av_clip(lrintf(0.5f * new_ehi * (vf + 1.f)), 0, new_ehi - 1);
1352 us[i][j] = u_shift + new_ui;
1353 vs[i][j] = v_shift + new_vi;
1361 * Calculate 3D coordinates on sphere for corresponding frame position in cubemap1x6 format.
1363 * @param s filter private context
1364 * @param i horizontal position on frame [0, width)
1365 * @param j vertical position on frame [0, height)
1366 * @param width frame width
1367 * @param height frame height
1368 * @param vec coordinates on sphere
1370 static int cube1x6_to_xyz(const V360Context *s,
1371 int i, int j, int width, int height,
1374 const float scalew = s->fout_pad > 0 ? 1.f - (float)(s->fout_pad) / s->out_width : 1.f - s->out_pad;
1375 const float scaleh = s->fout_pad > 0 ? 1.f - s->fout_pad / (s->out_height / 6.f) : 1.f - s->out_pad;
1377 const float ew = width;
1378 const float eh = height / 6.f;
1380 const int face = floorf(j / eh);
1382 const int v_shift = ceilf(eh * face);
1383 const int ehi = ceilf(eh * (face + 1)) - v_shift;
1385 const float uf = 2.f * (i + 0.5f) / ew - 1.f;
1386 const float vf = 2.f * (j - v_shift + 0.5f) / ehi - 1.f;
1388 cube_to_xyz(s, uf, vf, face, vec, scalew, scaleh);
1394 * Calculate 3D coordinates on sphere for corresponding frame position in cubemap6x1 format.
1396 * @param s filter private context
1397 * @param i horizontal position on frame [0, width)
1398 * @param j vertical position on frame [0, height)
1399 * @param width frame width
1400 * @param height frame height
1401 * @param vec coordinates on sphere
1403 static int cube6x1_to_xyz(const V360Context *s,
1404 int i, int j, int width, int height,
1407 const float scalew = s->fout_pad > 0 ? 1.f - s->fout_pad / (s->out_width / 6.f) : 1.f - s->out_pad;
1408 const float scaleh = s->fout_pad > 0 ? 1.f - (float)(s->fout_pad) / s->out_height : 1.f - s->out_pad;
1410 const float ew = width / 6.f;
1411 const float eh = height;
1413 const int face = floorf(i / ew);
1415 const int u_shift = ceilf(ew * face);
1416 const int ewi = ceilf(ew * (face + 1)) - u_shift;
1418 const float uf = 2.f * (i - u_shift + 0.5f) / ewi - 1.f;
1419 const float vf = 2.f * (j + 0.5f) / eh - 1.f;
1421 cube_to_xyz(s, uf, vf, face, vec, scalew, scaleh);
1427 * Calculate frame position in cubemap1x6 format for corresponding 3D coordinates on sphere.
1429 * @param s filter private context
1430 * @param vec coordinates on sphere
1431 * @param width frame width
1432 * @param height frame height
1433 * @param us horizontal coordinates for interpolation window
1434 * @param vs vertical coordinates for interpolation window
1435 * @param du horizontal relative coordinate
1436 * @param dv vertical relative coordinate
1438 static int xyz_to_cube1x6(const V360Context *s,
1439 const float *vec, int width, int height,
1440 int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
1442 const float scalew = s->fin_pad > 0 ? 1.f - (float)(s->fin_pad) / s->in_width : 1.f - s->in_pad;
1443 const float scaleh = s->fin_pad > 0 ? 1.f - s->fin_pad / (s->in_height / 6.f) : 1.f - s->in_pad;
1444 const float eh = height / 6.f;
1445 const int ewi = width;
1449 int direction, face;
1451 xyz_to_cube(s, vec, &uf, &vf, &direction);
1456 face = s->in_cubemap_face_order[direction];
1457 ehi = ceilf(eh * (face + 1)) - ceilf(eh * face);
1459 uf = 0.5f * ewi * (uf + 1.f) - 0.5f;
1460 vf = 0.5f * ehi * (vf + 1.f) - 0.5f;
1468 for (int i = 0; i < 4; i++) {
1469 for (int j = 0; j < 4; j++) {
1470 int new_ui = ui + j - 1;
1471 int new_vi = vi + i - 1;
1475 if (new_ui >= 0 && new_ui < ewi && new_vi >= 0 && new_vi < ehi) {
1476 face = s->in_cubemap_face_order[direction];
1478 v_shift = ceilf(eh * face);
1480 uf = 2.f * new_ui / ewi - 1.f;
1481 vf = 2.f * new_vi / ehi - 1.f;
1486 process_cube_coordinates(s, uf, vf, direction, &uf, &vf, &face);
1491 v_shift = ceilf(eh * face);
1492 new_ehi = ceilf(eh * (face + 1)) - v_shift;
1494 new_ui = av_clip(lrintf(0.5f * ewi * (uf + 1.f)), 0, ewi - 1);
1495 new_vi = av_clip(lrintf(0.5f * new_ehi * (vf + 1.f)), 0, new_ehi - 1);
1499 vs[i][j] = v_shift + new_vi;
1507 * Calculate frame position in cubemap6x1 format for corresponding 3D coordinates on sphere.
1509 * @param s filter private context
1510 * @param vec coordinates on sphere
1511 * @param width frame width
1512 * @param height frame height
1513 * @param us horizontal coordinates for interpolation window
1514 * @param vs vertical coordinates for interpolation window
1515 * @param du horizontal relative coordinate
1516 * @param dv vertical relative coordinate
1518 static int xyz_to_cube6x1(const V360Context *s,
1519 const float *vec, int width, int height,
1520 int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
1522 const float scalew = s->fin_pad > 0 ? 1.f - s->fin_pad / (s->in_width / 6.f) : 1.f - s->in_pad;
1523 const float scaleh = s->fin_pad > 0 ? 1.f - (float)(s->fin_pad) / s->in_height : 1.f - s->in_pad;
1524 const float ew = width / 6.f;
1525 const int ehi = height;
1529 int direction, face;
1531 xyz_to_cube(s, vec, &uf, &vf, &direction);
1536 face = s->in_cubemap_face_order[direction];
1537 ewi = ceilf(ew * (face + 1)) - ceilf(ew * face);
1539 uf = 0.5f * ewi * (uf + 1.f) - 0.5f;
1540 vf = 0.5f * ehi * (vf + 1.f) - 0.5f;
1548 for (int i = 0; i < 4; i++) {
1549 for (int j = 0; j < 4; j++) {
1550 int new_ui = ui + j - 1;
1551 int new_vi = vi + i - 1;
1555 if (new_ui >= 0 && new_ui < ewi && new_vi >= 0 && new_vi < ehi) {
1556 face = s->in_cubemap_face_order[direction];
1558 u_shift = ceilf(ew * face);
1560 uf = 2.f * new_ui / ewi - 1.f;
1561 vf = 2.f * new_vi / ehi - 1.f;
1566 process_cube_coordinates(s, uf, vf, direction, &uf, &vf, &face);
1571 u_shift = ceilf(ew * face);
1572 new_ewi = ceilf(ew * (face + 1)) - u_shift;
1574 new_ui = av_clip(lrintf(0.5f * new_ewi * (uf + 1.f)), 0, new_ewi - 1);
1575 new_vi = av_clip(lrintf(0.5f * ehi * (vf + 1.f)), 0, ehi - 1);
1578 us[i][j] = u_shift + new_ui;
1587 * Calculate 3D coordinates on sphere for corresponding frame position in equirectangular format.
1589 * @param s filter private context
1590 * @param i horizontal position on frame [0, width)
1591 * @param j vertical position on frame [0, height)
1592 * @param width frame width
1593 * @param height frame height
1594 * @param vec coordinates on sphere
1596 static int equirect_to_xyz(const V360Context *s,
1597 int i, int j, int width, int height,
1600 const float phi = ((2.f * i + 0.5f) / width - 1.f) * M_PI;
1601 const float theta = ((2.f * j + 0.5f) / height - 1.f) * M_PI_2;
1603 const float sin_phi = sinf(phi);
1604 const float cos_phi = cosf(phi);
1605 const float sin_theta = sinf(theta);
1606 const float cos_theta = cosf(theta);
1608 vec[0] = cos_theta * sin_phi;
1609 vec[1] = -sin_theta;
1610 vec[2] = -cos_theta * cos_phi;
1616 * Prepare data for processing stereographic output format.
1618 * @param ctx filter context
1620 * @return error code
1622 static int prepare_stereographic_out(AVFilterContext *ctx)
1624 V360Context *s = ctx->priv;
1626 s->flat_range[0] = tanf(FFMIN(s->h_fov, 359.f) * M_PI / 720.f);
1627 s->flat_range[1] = tanf(FFMIN(s->v_fov, 359.f) * M_PI / 720.f);
1633 * Calculate 3D coordinates on sphere for corresponding frame position in stereographic format.
1635 * @param s filter private context
1636 * @param i horizontal position on frame [0, width)
1637 * @param j vertical position on frame [0, height)
1638 * @param width frame width
1639 * @param height frame height
1640 * @param vec coordinates on sphere
1642 static int stereographic_to_xyz(const V360Context *s,
1643 int i, int j, int width, int height,
1646 const float x = ((2.f * i + 1.f) / width - 1.f) * s->flat_range[0];
1647 const float y = ((2.f * j + 1.f) / height - 1.f) * s->flat_range[1];
1648 const float xy = x * x + y * y;
1650 vec[0] = 2.f * x / (1.f + xy);
1651 vec[1] = (-1.f + xy) / (1.f + xy);
1652 vec[2] = 2.f * y / (1.f + xy);
1654 normalize_vector(vec);
1660 * Prepare data for processing stereographic input format.
1662 * @param ctx filter context
1664 * @return error code
1666 static int prepare_stereographic_in(AVFilterContext *ctx)
1668 V360Context *s = ctx->priv;
1670 s->iflat_range[0] = tanf(FFMIN(s->ih_fov, 359.f) * M_PI / 720.f);
1671 s->iflat_range[1] = tanf(FFMIN(s->iv_fov, 359.f) * M_PI / 720.f);
1677 * Calculate frame position in stereographic format for corresponding 3D coordinates on sphere.
1679 * @param s filter private context
1680 * @param vec coordinates on sphere
1681 * @param width frame width
1682 * @param height frame height
1683 * @param us horizontal coordinates for interpolation window
1684 * @param vs vertical coordinates for interpolation window
1685 * @param du horizontal relative coordinate
1686 * @param dv vertical relative coordinate
1688 static int xyz_to_stereographic(const V360Context *s,
1689 const float *vec, int width, int height,
1690 int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
1692 const float x = vec[0] / (1.f - vec[1]) / s->iflat_range[0] * s->input_mirror_modifier[0];
1693 const float y = vec[2] / (1.f - vec[1]) / s->iflat_range[1] * s->input_mirror_modifier[1];
1695 int visible, ui, vi;
1697 uf = (x + 1.f) * width / 2.f;
1698 vf = (y + 1.f) * height / 2.f;
1702 visible = isfinite(x) && isfinite(y) && vi >= 0 && vi < height && ui >= 0 && ui < width;
1704 *du = visible ? uf - ui : 0.f;
1705 *dv = visible ? vf - vi : 0.f;
1707 for (int i = 0; i < 4; i++) {
1708 for (int j = 0; j < 4; j++) {
1709 us[i][j] = visible ? av_clip(ui + j - 1, 0, width - 1) : 0;
1710 vs[i][j] = visible ? av_clip(vi + i - 1, 0, height - 1) : 0;
1718 * Calculate frame position in equirectangular format for corresponding 3D coordinates on sphere.
1720 * @param s filter private context
1721 * @param vec coordinates on sphere
1722 * @param width frame width
1723 * @param height frame height
1724 * @param us horizontal coordinates for interpolation window
1725 * @param vs vertical coordinates for interpolation window
1726 * @param du horizontal relative coordinate
1727 * @param dv vertical relative coordinate
1729 static int xyz_to_equirect(const V360Context *s,
1730 const float *vec, int width, int height,
1731 int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
1733 const float phi = atan2f(vec[0], -vec[2]) * s->input_mirror_modifier[0];
1734 const float theta = asinf(-vec[1]) * s->input_mirror_modifier[1];
1738 uf = (phi / M_PI + 1.f) * width / 2.f;
1739 vf = (theta / M_PI_2 + 1.f) * height / 2.f;
1746 for (int i = 0; i < 4; i++) {
1747 for (int j = 0; j < 4; j++) {
1748 us[i][j] = mod(ui + j - 1, width);
1749 vs[i][j] = av_clip(vi + i - 1, 0, height - 1);
1757 * Prepare data for processing flat input format.
1759 * @param ctx filter context
1761 * @return error code
1763 static int prepare_flat_in(AVFilterContext *ctx)
1765 V360Context *s = ctx->priv;
1767 s->iflat_range[0] = tanf(0.5f * s->ih_fov * M_PI / 180.f);
1768 s->iflat_range[1] = tanf(0.5f * s->iv_fov * M_PI / 180.f);
1774 * Calculate frame position in flat format for corresponding 3D coordinates on sphere.
1776 * @param s filter private context
1777 * @param vec coordinates on sphere
1778 * @param width frame width
1779 * @param height frame height
1780 * @param us horizontal coordinates for interpolation window
1781 * @param vs vertical coordinates for interpolation window
1782 * @param du horizontal relative coordinate
1783 * @param dv vertical relative coordinate
1785 static int xyz_to_flat(const V360Context *s,
1786 const float *vec, int width, int height,
1787 int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
1789 const float theta = acosf(vec[2]);
1790 const float r = tanf(theta);
1791 const float rr = fabsf(r) < 1e+6f ? r : hypotf(width, height);
1792 const float zf = -vec[2];
1793 const float h = hypotf(vec[0], vec[1]);
1794 const float c = h <= 1e-6f ? 1.f : rr / h;
1795 float uf = -vec[0] * c / s->iflat_range[0] * s->input_mirror_modifier[0];
1796 float vf = vec[1] * c / s->iflat_range[1] * s->input_mirror_modifier[1];
1797 int visible, ui, vi;
1799 uf = zf >= 0.f ? (uf + 1.f) * width / 2.f : 0.f;
1800 vf = zf >= 0.f ? (vf + 1.f) * height / 2.f : 0.f;
1805 visible = vi >= 0 && vi < height && ui >= 0 && ui < width && zf >= 0.f;
1810 for (int i = 0; i < 4; i++) {
1811 for (int j = 0; j < 4; j++) {
1812 us[i][j] = visible ? av_clip(ui + j - 1, 0, width - 1) : 0;
1813 vs[i][j] = visible ? av_clip(vi + i - 1, 0, height - 1) : 0;
1821 * Calculate frame position in mercator format for corresponding 3D coordinates on sphere.
1823 * @param s filter private context
1824 * @param vec coordinates on sphere
1825 * @param width frame width
1826 * @param height frame height
1827 * @param us horizontal coordinates for interpolation window
1828 * @param vs vertical coordinates for interpolation window
1829 * @param du horizontal relative coordinate
1830 * @param dv vertical relative coordinate
1832 static int xyz_to_mercator(const V360Context *s,
1833 const float *vec, int width, int height,
1834 int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
1836 const float phi = atan2f(vec[0], -vec[2]) * s->input_mirror_modifier[0];
1837 const float theta = -vec[1] * s->input_mirror_modifier[1];
1841 uf = (phi / M_PI + 1.f) * width / 2.f;
1842 vf = (av_clipf(logf((1.f + theta) / (1.f - theta)) / (2.f * M_PI), -1.f, 1.f) + 1.f) * height / 2.f;
1849 for (int i = 0; i < 4; i++) {
1850 for (int j = 0; j < 4; j++) {
1851 us[i][j] = av_clip(ui + j - 1, 0, width - 1);
1852 vs[i][j] = av_clip(vi + i - 1, 0, height - 1);
1860 * Calculate 3D coordinates on sphere for corresponding frame position in mercator format.
1862 * @param s filter private context
1863 * @param i horizontal position on frame [0, width)
1864 * @param j vertical position on frame [0, height)
1865 * @param width frame width
1866 * @param height frame height
1867 * @param vec coordinates on sphere
1869 static int mercator_to_xyz(const V360Context *s,
1870 int i, int j, int width, int height,
1873 const float phi = ((2.f * i + 1.f) / width - 1.f) * M_PI + M_PI_2;
1874 const float y = ((2.f * j + 1.f) / height - 1.f) * M_PI;
1875 const float div = expf(2.f * y) + 1.f;
1877 const float sin_phi = sinf(phi);
1878 const float cos_phi = cosf(phi);
1879 const float sin_theta = -2.f * expf(y) / div;
1880 const float cos_theta = -(expf(2.f * y) - 1.f) / div;
1882 vec[0] = sin_theta * cos_phi;
1884 vec[2] = sin_theta * sin_phi;
1890 * Calculate frame position in ball format for corresponding 3D coordinates on sphere.
1892 * @param s filter private context
1893 * @param vec coordinates on sphere
1894 * @param width frame width
1895 * @param height frame height
1896 * @param us horizontal coordinates for interpolation window
1897 * @param vs vertical coordinates for interpolation window
1898 * @param du horizontal relative coordinate
1899 * @param dv vertical relative coordinate
1901 static int xyz_to_ball(const V360Context *s,
1902 const float *vec, int width, int height,
1903 int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
1905 const float l = hypotf(vec[0], vec[1]);
1906 const float r = sqrtf(1.f + vec[2]) / M_SQRT2;
1910 uf = (1.f + r * vec[0] * s->input_mirror_modifier[0] / (l > 0.f ? l : 1.f)) * width * 0.5f;
1911 vf = (1.f - r * vec[1] * s->input_mirror_modifier[1] / (l > 0.f ? l : 1.f)) * height * 0.5f;
1919 for (int i = 0; i < 4; i++) {
1920 for (int j = 0; j < 4; j++) {
1921 us[i][j] = av_clip(ui + j - 1, 0, width - 1);
1922 vs[i][j] = av_clip(vi + i - 1, 0, height - 1);
1930 * Calculate 3D coordinates on sphere for corresponding frame position in ball format.
1932 * @param s filter private context
1933 * @param i horizontal position on frame [0, width)
1934 * @param j vertical position on frame [0, height)
1935 * @param width frame width
1936 * @param height frame height
1937 * @param vec coordinates on sphere
1939 static int ball_to_xyz(const V360Context *s,
1940 int i, int j, int width, int height,
1943 const float x = (2.f * i + 1.f) / width - 1.f;
1944 const float y = (2.f * j + 1.f) / height - 1.f;
1945 const float l = hypotf(x, y);
1948 const float z = 2.f * l * sqrtf(1.f - l * l);
1950 vec[0] = z * x / (l > 0.f ? l : 1.f);
1951 vec[1] = -z * y / (l > 0.f ? l : 1.f);
1952 vec[2] = -1.f + 2.f * l * l;
1964 * Calculate 3D coordinates on sphere for corresponding frame position in hammer format.
1966 * @param s filter private context
1967 * @param i horizontal position on frame [0, width)
1968 * @param j vertical position on frame [0, height)
1969 * @param width frame width
1970 * @param height frame height
1971 * @param vec coordinates on sphere
1973 static int hammer_to_xyz(const V360Context *s,
1974 int i, int j, int width, int height,
1977 const float x = ((2.f * i + 1.f) / width - 1.f);
1978 const float y = ((2.f * j + 1.f) / height - 1.f);
1980 const float xx = x * x;
1981 const float yy = y * y;
1983 const float z = sqrtf(1.f - xx * 0.5f - yy * 0.5f);
1985 const float a = M_SQRT2 * x * z;
1986 const float b = 2.f * z * z - 1.f;
1988 const float aa = a * a;
1989 const float bb = b * b;
1991 const float w = sqrtf(1.f - 2.f * yy * z * z);
1993 vec[0] = w * 2.f * a * b / (aa + bb);
1994 vec[1] = -M_SQRT2 * y * z;
1995 vec[2] = -w * (bb - aa) / (aa + bb);
1997 normalize_vector(vec);
2003 * Calculate frame position in hammer format for corresponding 3D coordinates on sphere.
2005 * @param s filter private context
2006 * @param vec coordinates on sphere
2007 * @param width frame width
2008 * @param height frame height
2009 * @param us horizontal coordinates for interpolation window
2010 * @param vs vertical coordinates for interpolation window
2011 * @param du horizontal relative coordinate
2012 * @param dv vertical relative coordinate
2014 static int xyz_to_hammer(const V360Context *s,
2015 const float *vec, int width, int height,
2016 int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
2018 const float theta = atan2f(vec[0], -vec[2]) * s->input_mirror_modifier[0];
2020 const float z = sqrtf(1.f + sqrtf(1.f - vec[1] * vec[1]) * cosf(theta * 0.5f));
2021 const float x = sqrtf(1.f - vec[1] * vec[1]) * sinf(theta * 0.5f) / z;
2022 const float y = -vec[1] / z * s->input_mirror_modifier[1];
2026 uf = (x + 1.f) * width / 2.f;
2027 vf = (y + 1.f) * height / 2.f;
2034 for (int i = 0; i < 4; i++) {
2035 for (int j = 0; j < 4; j++) {
2036 us[i][j] = av_clip(ui + j - 1, 0, width - 1);
2037 vs[i][j] = av_clip(vi + i - 1, 0, height - 1);
2045 * Calculate 3D coordinates on sphere for corresponding frame position in sinusoidal format.
2047 * @param s filter private context
2048 * @param i horizontal position on frame [0, width)
2049 * @param j vertical position on frame [0, height)
2050 * @param width frame width
2051 * @param height frame height
2052 * @param vec coordinates on sphere
2054 static int sinusoidal_to_xyz(const V360Context *s,
2055 int i, int j, int width, int height,
2058 const float theta = ((2.f * j + 1.f) / height - 1.f) * M_PI_2;
2059 const float phi = ((2.f * i + 1.f) / width - 1.f) * M_PI / cosf(theta);
2061 const float sin_phi = sinf(phi);
2062 const float cos_phi = cosf(phi);
2063 const float sin_theta = sinf(theta);
2064 const float cos_theta = cosf(theta);
2066 vec[0] = cos_theta * sin_phi;
2067 vec[1] = -sin_theta;
2068 vec[2] = -cos_theta * cos_phi;
2070 normalize_vector(vec);
2076 * Calculate frame position in sinusoidal format for corresponding 3D coordinates on sphere.
2078 * @param s filter private context
2079 * @param vec coordinates on sphere
2080 * @param width frame width
2081 * @param height frame height
2082 * @param us horizontal coordinates for interpolation window
2083 * @param vs vertical coordinates for interpolation window
2084 * @param du horizontal relative coordinate
2085 * @param dv vertical relative coordinate
2087 static int xyz_to_sinusoidal(const V360Context *s,
2088 const float *vec, int width, int height,
2089 int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
2091 const float theta = asinf(-vec[1]) * s->input_mirror_modifier[1];
2092 const float phi = atan2f(vec[0], -vec[2]) * s->input_mirror_modifier[0] * cosf(theta);
2096 uf = (phi / M_PI + 1.f) * width / 2.f;
2097 vf = (theta / M_PI_2 + 1.f) * height / 2.f;
2104 for (int i = 0; i < 4; i++) {
2105 for (int j = 0; j < 4; j++) {
2106 us[i][j] = av_clip(ui + j - 1, 0, width - 1);
2107 vs[i][j] = av_clip(vi + i - 1, 0, height - 1);
2115 * Prepare data for processing equi-angular cubemap input format.
2117 * @param ctx filter context
2119 * @return error code
2121 static int prepare_eac_in(AVFilterContext *ctx)
2123 V360Context *s = ctx->priv;
2125 if (s->ih_flip && s->iv_flip) {
2126 s->in_cubemap_face_order[RIGHT] = BOTTOM_LEFT;
2127 s->in_cubemap_face_order[LEFT] = BOTTOM_RIGHT;
2128 s->in_cubemap_face_order[UP] = TOP_LEFT;
2129 s->in_cubemap_face_order[DOWN] = TOP_RIGHT;
2130 s->in_cubemap_face_order[FRONT] = BOTTOM_MIDDLE;
2131 s->in_cubemap_face_order[BACK] = TOP_MIDDLE;
2132 } else if (s->ih_flip) {
2133 s->in_cubemap_face_order[RIGHT] = TOP_LEFT;
2134 s->in_cubemap_face_order[LEFT] = TOP_RIGHT;
2135 s->in_cubemap_face_order[UP] = BOTTOM_LEFT;
2136 s->in_cubemap_face_order[DOWN] = BOTTOM_RIGHT;
2137 s->in_cubemap_face_order[FRONT] = TOP_MIDDLE;
2138 s->in_cubemap_face_order[BACK] = BOTTOM_MIDDLE;
2139 } else if (s->iv_flip) {
2140 s->in_cubemap_face_order[RIGHT] = BOTTOM_RIGHT;
2141 s->in_cubemap_face_order[LEFT] = BOTTOM_LEFT;
2142 s->in_cubemap_face_order[UP] = TOP_RIGHT;
2143 s->in_cubemap_face_order[DOWN] = TOP_LEFT;
2144 s->in_cubemap_face_order[FRONT] = BOTTOM_MIDDLE;
2145 s->in_cubemap_face_order[BACK] = TOP_MIDDLE;
2147 s->in_cubemap_face_order[RIGHT] = TOP_RIGHT;
2148 s->in_cubemap_face_order[LEFT] = TOP_LEFT;
2149 s->in_cubemap_face_order[UP] = BOTTOM_RIGHT;
2150 s->in_cubemap_face_order[DOWN] = BOTTOM_LEFT;
2151 s->in_cubemap_face_order[FRONT] = TOP_MIDDLE;
2152 s->in_cubemap_face_order[BACK] = BOTTOM_MIDDLE;
2156 s->in_cubemap_face_rotation[TOP_LEFT] = ROT_270;
2157 s->in_cubemap_face_rotation[TOP_MIDDLE] = ROT_90;
2158 s->in_cubemap_face_rotation[TOP_RIGHT] = ROT_270;
2159 s->in_cubemap_face_rotation[BOTTOM_LEFT] = ROT_0;
2160 s->in_cubemap_face_rotation[BOTTOM_MIDDLE] = ROT_0;
2161 s->in_cubemap_face_rotation[BOTTOM_RIGHT] = ROT_0;
2163 s->in_cubemap_face_rotation[TOP_LEFT] = ROT_0;
2164 s->in_cubemap_face_rotation[TOP_MIDDLE] = ROT_0;
2165 s->in_cubemap_face_rotation[TOP_RIGHT] = ROT_0;
2166 s->in_cubemap_face_rotation[BOTTOM_LEFT] = ROT_270;
2167 s->in_cubemap_face_rotation[BOTTOM_MIDDLE] = ROT_90;
2168 s->in_cubemap_face_rotation[BOTTOM_RIGHT] = ROT_270;
2175 * Prepare data for processing equi-angular cubemap output format.
2177 * @param ctx filter context
2179 * @return error code
2181 static int prepare_eac_out(AVFilterContext *ctx)
2183 V360Context *s = ctx->priv;
2185 s->out_cubemap_direction_order[TOP_LEFT] = LEFT;
2186 s->out_cubemap_direction_order[TOP_MIDDLE] = FRONT;
2187 s->out_cubemap_direction_order[TOP_RIGHT] = RIGHT;
2188 s->out_cubemap_direction_order[BOTTOM_LEFT] = DOWN;
2189 s->out_cubemap_direction_order[BOTTOM_MIDDLE] = BACK;
2190 s->out_cubemap_direction_order[BOTTOM_RIGHT] = UP;
2192 s->out_cubemap_face_rotation[TOP_LEFT] = ROT_0;
2193 s->out_cubemap_face_rotation[TOP_MIDDLE] = ROT_0;
2194 s->out_cubemap_face_rotation[TOP_RIGHT] = ROT_0;
2195 s->out_cubemap_face_rotation[BOTTOM_LEFT] = ROT_270;
2196 s->out_cubemap_face_rotation[BOTTOM_MIDDLE] = ROT_90;
2197 s->out_cubemap_face_rotation[BOTTOM_RIGHT] = ROT_270;
2203 * Calculate 3D coordinates on sphere for corresponding frame position in equi-angular cubemap format.
2205 * @param s filter private context
2206 * @param i horizontal position on frame [0, width)
2207 * @param j vertical position on frame [0, height)
2208 * @param width frame width
2209 * @param height frame height
2210 * @param vec coordinates on sphere
2212 static int eac_to_xyz(const V360Context *s,
2213 int i, int j, int width, int height,
2216 const float pixel_pad = 2;
2217 const float u_pad = pixel_pad / width;
2218 const float v_pad = pixel_pad / height;
2220 int u_face, v_face, face;
2222 float l_x, l_y, l_z;
2224 float uf = (i + 0.5f) / width;
2225 float vf = (j + 0.5f) / height;
2227 // EAC has 2-pixel padding on faces except between faces on the same row
2228 // Padding pixels seems not to be stretched with tangent as regular pixels
2229 // Formulas below approximate original padding as close as I could get experimentally
2231 // Horizontal padding
2232 uf = 3.f * (uf - u_pad) / (1.f - 2.f * u_pad);
2236 } else if (uf >= 3.f) {
2240 u_face = floorf(uf);
2241 uf = fmodf(uf, 1.f) - 0.5f;
2245 v_face = floorf(vf * 2.f);
2246 vf = (vf - v_pad - 0.5f * v_face) / (0.5f - 2.f * v_pad) - 0.5f;
2248 if (uf >= -0.5f && uf < 0.5f) {
2249 uf = tanf(M_PI_2 * uf);
2253 if (vf >= -0.5f && vf < 0.5f) {
2254 vf = tanf(M_PI_2 * vf);
2259 face = u_face + 3 * v_face;
2300 normalize_vector(vec);
2306 * Calculate frame position in equi-angular cubemap format for corresponding 3D coordinates on sphere.
2308 * @param s filter private context
2309 * @param vec coordinates on sphere
2310 * @param width frame width
2311 * @param height frame height
2312 * @param us horizontal coordinates for interpolation window
2313 * @param vs vertical coordinates for interpolation window
2314 * @param du horizontal relative coordinate
2315 * @param dv vertical relative coordinate
2317 static int xyz_to_eac(const V360Context *s,
2318 const float *vec, int width, int height,
2319 int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
2321 const float pixel_pad = 2;
2322 const float u_pad = pixel_pad / width;
2323 const float v_pad = pixel_pad / height;
2327 int direction, face;
2330 xyz_to_cube(s, vec, &uf, &vf, &direction);
2332 face = s->in_cubemap_face_order[direction];
2336 uf = M_2_PI * atanf(uf) + 0.5f;
2337 vf = M_2_PI * atanf(vf) + 0.5f;
2339 // These formulas are inversed from eac_to_xyz ones
2340 uf = (uf + u_face) * (1.f - 2.f * u_pad) / 3.f + u_pad;
2341 vf = vf * (0.5f - 2.f * v_pad) + v_pad + 0.5f * v_face;
2355 for (int i = 0; i < 4; i++) {
2356 for (int j = 0; j < 4; j++) {
2357 us[i][j] = av_clip(ui + j - 1, 0, width - 1);
2358 vs[i][j] = av_clip(vi + i - 1, 0, height - 1);
2366 * Prepare data for processing flat output format.
2368 * @param ctx filter context
2370 * @return error code
2372 static int prepare_flat_out(AVFilterContext *ctx)
2374 V360Context *s = ctx->priv;
2376 s->flat_range[0] = tanf(0.5f * s->h_fov * M_PI / 180.f);
2377 s->flat_range[1] = tanf(0.5f * s->v_fov * M_PI / 180.f);
2383 * Calculate 3D coordinates on sphere for corresponding frame position in flat format.
2385 * @param s filter private context
2386 * @param i horizontal position on frame [0, width)
2387 * @param j vertical position on frame [0, height)
2388 * @param width frame width
2389 * @param height frame height
2390 * @param vec coordinates on sphere
2392 static int flat_to_xyz(const V360Context *s,
2393 int i, int j, int width, int height,
2396 const float l_x = s->flat_range[0] * ((2.f * i + 0.5f) / width - 1.f);
2397 const float l_y = -s->flat_range[1] * ((2.f * j + 0.5f) / height - 1.f);
2403 normalize_vector(vec);
2409 * Prepare data for processing fisheye output format.
2411 * @param ctx filter context
2413 * @return error code
2415 static int prepare_fisheye_out(AVFilterContext *ctx)
2417 V360Context *s = ctx->priv;
2419 s->flat_range[0] = s->h_fov / 180.f;
2420 s->flat_range[1] = s->v_fov / 180.f;
2426 * Calculate 3D coordinates on sphere for corresponding frame position in fisheye format.
2428 * @param s filter private context
2429 * @param i horizontal position on frame [0, width)
2430 * @param j vertical position on frame [0, height)
2431 * @param width frame width
2432 * @param height frame height
2433 * @param vec coordinates on sphere
2435 static int fisheye_to_xyz(const V360Context *s,
2436 int i, int j, int width, int height,
2439 const float uf = s->flat_range[0] * ((2.f * i) / width - 1.f);
2440 const float vf = s->flat_range[1] * ((2.f * j + 1.f) / height - 1.f);
2442 const float phi = -atan2f(vf, uf);
2443 const float theta = -M_PI_2 * (1.f - hypotf(uf, vf));
2445 vec[0] = cosf(theta) * cosf(phi);
2446 vec[1] = cosf(theta) * sinf(phi);
2447 vec[2] = sinf(theta);
2449 normalize_vector(vec);
2455 * Prepare data for processing fisheye input format.
2457 * @param ctx filter context
2459 * @return error code
2461 static int prepare_fisheye_in(AVFilterContext *ctx)
2463 V360Context *s = ctx->priv;
2465 s->iflat_range[0] = s->ih_fov / 180.f;
2466 s->iflat_range[1] = s->iv_fov / 180.f;
2472 * Calculate frame position in fisheye format for corresponding 3D coordinates on sphere.
2474 * @param s filter private context
2475 * @param vec coordinates on sphere
2476 * @param width frame width
2477 * @param height frame height
2478 * @param us horizontal coordinates for interpolation window
2479 * @param vs vertical coordinates for interpolation window
2480 * @param du horizontal relative coordinate
2481 * @param dv vertical relative coordinate
2483 static int xyz_to_fisheye(const V360Context *s,
2484 const float *vec, int width, int height,
2485 int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
2487 const float h = hypotf(vec[0], vec[1]);
2488 const float lh = h > 0.f ? h : 1.f;
2489 const float phi = atan2f(h, -vec[2]) / M_PI;
2491 float uf = vec[0] / lh * phi * s->input_mirror_modifier[0] / s->iflat_range[0];
2492 float vf = -vec[1] / lh * phi * s->input_mirror_modifier[1] / s->iflat_range[1];
2494 const int visible = hypotf(uf, vf) <= 0.5f;
2497 uf = (uf + 0.5f) * width;
2498 vf = (vf + 0.5f) * height;
2503 *du = visible ? uf - ui : 0.f;
2504 *dv = visible ? vf - vi : 0.f;
2506 for (int i = 0; i < 4; i++) {
2507 for (int j = 0; j < 4; j++) {
2508 us[i][j] = visible ? av_clip(ui + j - 1, 0, width - 1) : 0;
2509 vs[i][j] = visible ? av_clip(vi + i - 1, 0, height - 1) : 0;
2517 * Calculate 3D coordinates on sphere for corresponding frame position in pannini format.
2519 * @param s filter private context
2520 * @param i horizontal position on frame [0, width)
2521 * @param j vertical position on frame [0, height)
2522 * @param width frame width
2523 * @param height frame height
2524 * @param vec coordinates on sphere
2526 static int pannini_to_xyz(const V360Context *s,
2527 int i, int j, int width, int height,
2530 const float uf = ((2.f * i + 1.f) / width - 1.f);
2531 const float vf = ((2.f * j + 1.f) / height - 1.f);
2533 const float d = s->h_fov;
2534 const float k = uf * uf / ((d + 1.f) * (d + 1.f));
2535 const float dscr = k * k * d * d - (k + 1.f) * (k * d * d - 1.f);
2536 const float clon = (-k * d + sqrtf(dscr)) / (k + 1.f);
2537 const float S = (d + 1.f) / (d + clon);
2538 const float lon = -(M_PI + atan2f(uf, S * clon));
2539 const float lat = -atan2f(vf, S);
2541 vec[0] = sinf(lon) * cosf(lat);
2543 vec[2] = cosf(lon) * cosf(lat);
2545 normalize_vector(vec);
2551 * Prepare data for processing cylindrical output format.
2553 * @param ctx filter context
2555 * @return error code
2557 static int prepare_cylindrical_out(AVFilterContext *ctx)
2559 V360Context *s = ctx->priv;
2561 s->flat_range[0] = M_PI * s->h_fov / 360.f;
2562 s->flat_range[1] = tanf(0.5f * s->v_fov * M_PI / 180.f);
2568 * Calculate 3D coordinates on sphere for corresponding frame position in cylindrical format.
2570 * @param s filter private context
2571 * @param i horizontal position on frame [0, width)
2572 * @param j vertical position on frame [0, height)
2573 * @param width frame width
2574 * @param height frame height
2575 * @param vec coordinates on sphere
2577 static int cylindrical_to_xyz(const V360Context *s,
2578 int i, int j, int width, int height,
2581 const float uf = s->flat_range[0] * ((2.f * i + 1.f) / width - 1.f);
2582 const float vf = s->flat_range[1] * ((2.f * j + 1.f) / height - 1.f);
2584 const float phi = uf;
2585 const float theta = atanf(vf);
2587 const float sin_phi = sinf(phi);
2588 const float cos_phi = cosf(phi);
2589 const float sin_theta = sinf(theta);
2590 const float cos_theta = cosf(theta);
2592 vec[0] = cos_theta * sin_phi;
2593 vec[1] = -sin_theta;
2594 vec[2] = -cos_theta * cos_phi;
2596 normalize_vector(vec);
2602 * Prepare data for processing cylindrical input format.
2604 * @param ctx filter context
2606 * @return error code
2608 static int prepare_cylindrical_in(AVFilterContext *ctx)
2610 V360Context *s = ctx->priv;
2612 s->iflat_range[0] = M_PI * s->ih_fov / 360.f;
2613 s->iflat_range[1] = tanf(0.5f * s->iv_fov * M_PI / 180.f);
2619 * Calculate frame position in cylindrical format for corresponding 3D coordinates on sphere.
2621 * @param s filter private context
2622 * @param vec coordinates on sphere
2623 * @param width frame width
2624 * @param height frame height
2625 * @param us horizontal coordinates for interpolation window
2626 * @param vs vertical coordinates for interpolation window
2627 * @param du horizontal relative coordinate
2628 * @param dv vertical relative coordinate
2630 static int xyz_to_cylindrical(const V360Context *s,
2631 const float *vec, int width, int height,
2632 int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
2634 const float phi = atan2f(vec[0], -vec[2]) * s->input_mirror_modifier[0] / s->iflat_range[0];
2635 const float theta = atan2f(-vec[1], hypotf(vec[0], vec[2])) * s->input_mirror_modifier[1] / s->iflat_range[1];
2636 int visible, ui, vi;
2639 uf = (phi + 1.f) * (width - 1) / 2.f;
2640 vf = (tanf(theta) + 1.f) * height / 2.f;
2644 visible = vi >= 0 && vi < height && ui >= 0 && ui < width &&
2645 theta <= M_PI * s->iv_fov / 180.f &&
2646 theta >= -M_PI * s->iv_fov / 180.f;
2651 for (int i = 0; i < 4; i++) {
2652 for (int j = 0; j < 4; j++) {
2653 us[i][j] = visible ? av_clip(ui + j - 1, 0, width - 1) : 0;
2654 vs[i][j] = visible ? av_clip(vi + i - 1, 0, height - 1) : 0;
2662 * Calculate 3D coordinates on sphere for corresponding frame position in perspective format.
2664 * @param s filter private context
2665 * @param i horizontal position on frame [0, width)
2666 * @param j vertical position on frame [0, height)
2667 * @param width frame width
2668 * @param height frame height
2669 * @param vec coordinates on sphere
2671 static int perspective_to_xyz(const V360Context *s,
2672 int i, int j, int width, int height,
2675 const float uf = ((2.f * i + 1.f) / width - 1.f);
2676 const float vf = ((2.f * j + 1.f) / height - 1.f);
2677 const float rh = hypotf(uf, vf);
2678 const float sinzz = 1.f - rh * rh;
2679 const float h = 1.f + s->v_fov;
2680 const float sinz = (h - sqrtf(sinzz)) / (h / rh + rh / h);
2681 const float sinz2 = sinz * sinz;
2684 const float cosz = sqrtf(1.f - sinz2);
2686 const float theta = asinf(cosz);
2687 const float phi = atan2f(uf, vf);
2689 const float sin_phi = sinf(phi);
2690 const float cos_phi = cosf(phi);
2691 const float sin_theta = sinf(theta);
2692 const float cos_theta = cosf(theta);
2694 vec[0] = cos_theta * sin_phi;
2696 vec[2] = -cos_theta * cos_phi;
2704 normalize_vector(vec);
2709 * Calculate 3D coordinates on sphere for corresponding frame position in tetrahedron format.
2711 * @param s filter private context
2712 * @param i horizontal position on frame [0, width)
2713 * @param j vertical position on frame [0, height)
2714 * @param width frame width
2715 * @param height frame height
2716 * @param vec coordinates on sphere
2718 static int tetrahedron_to_xyz(const V360Context *s,
2719 int i, int j, int width, int height,
2722 const float uf = (float)i / width;
2723 const float vf = (float)j / height;
2725 vec[0] = uf < 0.5f ? uf * 4.f - 1.f : 3.f - uf * 4.f;
2726 vec[1] = 1.f - vf * 2.f;
2727 vec[2] = 2.f * fabsf(1.f - fabsf(1.f - uf * 2.f + vf)) - 1.f;
2729 normalize_vector(vec);
2735 * Calculate frame position in tetrahedron format for corresponding 3D coordinates on sphere.
2737 * @param s filter private context
2738 * @param vec coordinates on sphere
2739 * @param width frame width
2740 * @param height frame height
2741 * @param us horizontal coordinates for interpolation window
2742 * @param vs vertical coordinates for interpolation window
2743 * @param du horizontal relative coordinate
2744 * @param dv vertical relative coordinate
2746 static int xyz_to_tetrahedron(const V360Context *s,
2747 const float *vec, int width, int height,
2748 int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
2750 const float d0 = vec[0] * 1.f + vec[1] * 1.f + vec[2] *-1.f;
2751 const float d1 = vec[0] *-1.f + vec[1] *-1.f + vec[2] *-1.f;
2752 const float d2 = vec[0] * 1.f + vec[1] *-1.f + vec[2] * 1.f;
2753 const float d3 = vec[0] *-1.f + vec[1] * 1.f + vec[2] * 1.f;
2754 const float d = FFMAX(d0, FFMAX3(d1, d2, d3));
2756 float uf, vf, x, y, z;
2763 vf = 0.5f - y * 0.5f * s->input_mirror_modifier[1];
2765 if ((x + y >= 0.f && y + z >= 0.f && -z - x <= 0.f) ||
2766 (x + y <= 0.f && -y + z >= 0.f && z - x >= 0.f)) {
2767 uf = 0.25f * x * s->input_mirror_modifier[0] + 0.25f;
2769 uf = 0.75f - 0.25f * x * s->input_mirror_modifier[0];
2781 for (int i = 0; i < 4; i++) {
2782 for (int j = 0; j < 4; j++) {
2783 us[i][j] = reflectx(ui + j - 1, vi + i - 1, width, height);
2784 vs[i][j] = reflecty(vi + i - 1, height);
2792 * Calculate 3D coordinates on sphere for corresponding frame position in dual fisheye format.
2794 * @param s filter private context
2795 * @param i horizontal position on frame [0, width)
2796 * @param j vertical position on frame [0, height)
2797 * @param width frame width
2798 * @param height frame height
2799 * @param vec coordinates on sphere
2801 static int dfisheye_to_xyz(const V360Context *s,
2802 int i, int j, int width, int height,
2805 const float scale = 1.f + s->out_pad;
2807 const float ew = width / 2.f;
2808 const float eh = height;
2810 const int ei = i >= ew ? i - ew : i;
2811 const float m = i >= ew ? -1.f : 1.f;
2813 const float uf = ((2.f * ei) / ew - 1.f) * scale;
2814 const float vf = ((2.f * j + 1.f) / eh - 1.f) * scale;
2816 const float h = hypotf(uf, vf);
2817 const float lh = h > 0.f ? h : 1.f;
2818 const float theta = m * M_PI_2 * (1.f - h);
2820 const float sin_theta = sinf(theta);
2821 const float cos_theta = cosf(theta);
2823 vec[0] = cos_theta * m * -uf / lh;
2824 vec[1] = cos_theta * -vf / lh;
2827 normalize_vector(vec);
2833 * Calculate frame position in dual fisheye format for corresponding 3D coordinates on sphere.
2835 * @param s filter private context
2836 * @param vec coordinates on sphere
2837 * @param width frame width
2838 * @param height frame height
2839 * @param us horizontal coordinates for interpolation window
2840 * @param vs vertical coordinates for interpolation window
2841 * @param du horizontal relative coordinate
2842 * @param dv vertical relative coordinate
2844 static int xyz_to_dfisheye(const V360Context *s,
2845 const float *vec, int width, int height,
2846 int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
2848 const float scale = 1.f - s->in_pad;
2850 const float ew = width / 2.f;
2851 const float eh = height;
2853 const float h = hypotf(vec[0], vec[1]);
2854 const float lh = h > 0.f ? h : 1.f;
2855 const float theta = acosf(fabsf(vec[2])) / M_PI;
2857 float uf = (theta * (-vec[0] / lh) * s->input_mirror_modifier[0] * scale + 0.5f) * ew;
2858 float vf = (theta * (-vec[1] / lh) * s->input_mirror_modifier[1] * scale + 0.5f) * eh;
2863 if (vec[2] >= 0.f) {
2866 u_shift = ceilf(ew);
2876 for (int i = 0; i < 4; i++) {
2877 for (int j = 0; j < 4; j++) {
2878 us[i][j] = av_clip(u_shift + ui + j - 1, 0, width - 1);
2879 vs[i][j] = av_clip( vi + i - 1, 0, height - 1);
2887 * Calculate 3D coordinates on sphere for corresponding frame position in barrel facebook's format.
2889 * @param s filter private context
2890 * @param i horizontal position on frame [0, width)
2891 * @param j vertical position on frame [0, height)
2892 * @param width frame width
2893 * @param height frame height
2894 * @param vec coordinates on sphere
2896 static int barrel_to_xyz(const V360Context *s,
2897 int i, int j, int width, int height,
2900 const float scale = 0.99f;
2901 float l_x, l_y, l_z;
2903 if (i < 4 * width / 5) {
2904 const float theta_range = M_PI_4;
2906 const int ew = 4 * width / 5;
2907 const int eh = height;
2909 const float phi = ((2.f * i) / ew - 1.f) * M_PI / scale;
2910 const float theta = ((2.f * j) / eh - 1.f) * theta_range / scale;
2912 const float sin_phi = sinf(phi);
2913 const float cos_phi = cosf(phi);
2914 const float sin_theta = sinf(theta);
2915 const float cos_theta = cosf(theta);
2917 l_x = cos_theta * sin_phi;
2919 l_z = -cos_theta * cos_phi;
2921 const int ew = width / 5;
2922 const int eh = height / 2;
2927 uf = 2.f * (i - 4 * ew) / ew - 1.f;
2928 vf = 2.f * (j ) / eh - 1.f;
2937 uf = 2.f * (i - 4 * ew) / ew - 1.f;
2938 vf = 2.f * (j - eh) / eh - 1.f;
2953 normalize_vector(vec);
2959 * Calculate frame position in barrel facebook's format for corresponding 3D coordinates on sphere.
2961 * @param s filter private context
2962 * @param vec coordinates on sphere
2963 * @param width frame width
2964 * @param height frame height
2965 * @param us horizontal coordinates for interpolation window
2966 * @param vs vertical coordinates for interpolation window
2967 * @param du horizontal relative coordinate
2968 * @param dv vertical relative coordinate
2970 static int xyz_to_barrel(const V360Context *s,
2971 const float *vec, int width, int height,
2972 int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
2974 const float scale = 0.99f;
2976 const float phi = atan2f(vec[0], -vec[2]) * s->input_mirror_modifier[0];
2977 const float theta = asinf(-vec[1]) * s->input_mirror_modifier[1];
2978 const float theta_range = M_PI_4;
2981 int u_shift, v_shift;
2985 if (theta > -theta_range && theta < theta_range) {
2989 u_shift = s->ih_flip ? width / 5 : 0;
2992 uf = (phi / M_PI * scale + 1.f) * ew / 2.f;
2993 vf = (theta / theta_range * scale + 1.f) * eh / 2.f;
2998 u_shift = s->ih_flip ? 0 : 4 * ew;
3000 if (theta < 0.f) { // UP
3001 uf = vec[0] / vec[1];
3002 vf = -vec[2] / vec[1];
3005 uf = -vec[0] / vec[1];
3006 vf = -vec[2] / vec[1];
3010 uf *= s->input_mirror_modifier[0] * s->input_mirror_modifier[1];
3011 vf *= s->input_mirror_modifier[1];
3013 uf = 0.5f * ew * (uf * scale + 1.f);
3014 vf = 0.5f * eh * (vf * scale + 1.f);
3023 for (int i = 0; i < 4; i++) {
3024 for (int j = 0; j < 4; j++) {
3025 us[i][j] = u_shift + av_clip(ui + j - 1, 0, ew - 1);
3026 vs[i][j] = v_shift + av_clip(vi + i - 1, 0, eh - 1);
3034 * Calculate frame position in barrel split facebook's format for corresponding 3D coordinates on sphere.
3036 * @param s filter private context
3037 * @param vec coordinates on sphere
3038 * @param width frame width
3039 * @param height frame height
3040 * @param us horizontal coordinates for interpolation window
3041 * @param vs vertical coordinates for interpolation window
3042 * @param du horizontal relative coordinate
3043 * @param dv vertical relative coordinate
3045 static int xyz_to_barrelsplit(const V360Context *s,
3046 const float *vec, int width, int height,
3047 int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
3049 const float phi = atan2f(vec[0], -vec[2]) * s->input_mirror_modifier[0];
3050 const float theta = asinf(-vec[1]) * s->input_mirror_modifier[1];
3052 const float theta_range = M_PI_4;
3055 int u_shift, v_shift;
3059 if (theta >= -theta_range && theta <= theta_range) {
3060 const float scalew = s->fin_pad > 0 ? 1.f - s->fin_pad / (width * 2.f / 3.f) : 1.f - s->in_pad;
3061 const float scaleh = s->fin_pad > 0 ? 1.f - s->fin_pad / (height / 2.f) : 1.f - s->in_pad;
3066 u_shift = s->ih_flip ? width / 3 : 0;
3067 v_shift = phi >= M_PI_2 || phi < -M_PI_2 ? eh : 0;
3069 uf = fmodf(phi, M_PI_2) / M_PI_2;
3070 vf = theta / M_PI_4;
3073 uf = uf >= 0.f ? fmodf(uf - 1.f, 1.f) : fmodf(uf + 1.f, 1.f);
3075 uf = (uf * scalew + 1.f) * width / 3.f;
3076 vf = (vf * scaleh + 1.f) * height / 4.f;
3078 const float scalew = s->fin_pad > 0 ? 1.f - s->fin_pad / (width / 3.f) : 1.f - s->in_pad;
3079 const float scaleh = s->fin_pad > 0 ? 1.f - s->fin_pad / (height / 4.f) : 1.f - s->in_pad;
3085 u_shift = s->ih_flip ? 0 : 2 * ew;
3087 if (theta <= 0.f && theta >= -M_PI_2 &&
3088 phi <= M_PI_2 && phi >= -M_PI_2) {
3089 uf = vec[0] / vec[1];
3090 vf = -vec[2] / vec[1];
3093 } else if (theta >= 0.f && theta <= M_PI_2 &&
3094 phi <= M_PI_2 && phi >= -M_PI_2) {
3095 uf = -vec[0] / vec[1];
3096 vf = -vec[2] / vec[1];
3097 v_shift = height * 0.25f;
3098 } else if (theta <= 0.f && theta >= -M_PI_2) {
3099 uf = -vec[0] / vec[1];
3100 vf = vec[2] / vec[1];
3101 v_shift = height * 0.5f;
3104 uf = vec[0] / vec[1];
3105 vf = vec[2] / vec[1];
3106 v_shift = height * 0.75f;
3109 uf *= s->input_mirror_modifier[0] * s->input_mirror_modifier[1];
3110 vf *= s->input_mirror_modifier[1];
3112 uf = 0.5f * width / 3.f * (uf * scalew + 1.f);
3113 vf = height * 0.25f * (vf * scaleh + 1.f) + v_offset;
3122 for (int i = 0; i < 4; i++) {
3123 for (int j = 0; j < 4; j++) {
3124 us[i][j] = u_shift + av_clip(ui + j - 1, 0, ew - 1);
3125 vs[i][j] = v_shift + av_clip(vi + i - 1, 0, eh - 1);
3133 * Calculate 3D coordinates on sphere for corresponding frame position in barrel split facebook's format.
3135 * @param s filter private context
3136 * @param i horizontal position on frame [0, width)
3137 * @param j vertical position on frame [0, height)
3138 * @param width frame width
3139 * @param height frame height
3140 * @param vec coordinates on sphere
3142 static int barrelsplit_to_xyz(const V360Context *s,
3143 int i, int j, int width, int height,
3146 const float x = (i + 0.5f) / width;
3147 const float y = (j + 0.5f) / height;
3148 float l_x, l_y, l_z;
3150 if (x < 2.f / 3.f) {
3151 const float scalew = s->fout_pad > 0 ? 1.f - s->fout_pad / (width * 2.f / 3.f) : 1.f - s->out_pad;
3152 const float scaleh = s->fout_pad > 0 ? 1.f - s->fout_pad / (height / 2.f) : 1.f - s->out_pad;
3154 const float back = floorf(y * 2.f);
3156 const float phi = ((3.f / 2.f * x - 0.5f) / scalew - back + 1.f) * M_PI;
3157 const float theta = (y - 0.25f - 0.5f * back) / scaleh * M_PI;
3159 const float sin_phi = sinf(phi);
3160 const float cos_phi = cosf(phi);
3161 const float sin_theta = sinf(theta);
3162 const float cos_theta = cosf(theta);
3164 l_x = -cos_theta * sin_phi;
3166 l_z = cos_theta * cos_phi;
3168 const float scalew = s->fout_pad > 0 ? 1.f - s->fout_pad / (width / 3.f) : 1.f - s->out_pad;
3169 const float scaleh = s->fout_pad > 0 ? 1.f - s->fout_pad / (height / 4.f) : 1.f - s->out_pad;
3171 const int face = floorf(y * 4.f);
3182 l_x = (0.5f - uf) / scalew;
3184 l_z = (-0.5f + vf) / scaleh;
3189 vf = 1.f - (vf - 0.5f);
3191 l_x = (0.5f - uf) / scalew;
3193 l_z = (0.5f - vf) / scaleh;
3196 vf = y * 2.f - 0.5f;
3197 vf = 1.f - (1.f - vf);
3199 l_x = (0.5f - uf) / scalew;
3201 l_z = (-0.5f + vf) / scaleh;
3204 vf = y * 2.f - 1.5f;
3206 l_x = (0.5f - uf) / scalew;
3208 l_z = (0.5f - vf) / scaleh;
3217 normalize_vector(vec);
3222 static void multiply_matrix(float c[3][3], const float a[3][3], const float b[3][3])
3224 for (int i = 0; i < 3; i++) {
3225 for (int j = 0; j < 3; j++) {
3228 for (int k = 0; k < 3; k++)
3229 sum += a[i][k] * b[k][j];
3237 * Calculate rotation matrix for yaw/pitch/roll angles.
3239 static inline void calculate_rotation_matrix(float yaw, float pitch, float roll,
3240 float rot_mat[3][3],
3241 const int rotation_order[3])
3243 const float yaw_rad = yaw * M_PI / 180.f;
3244 const float pitch_rad = pitch * M_PI / 180.f;
3245 const float roll_rad = roll * M_PI / 180.f;
3247 const float sin_yaw = sinf(-yaw_rad);
3248 const float cos_yaw = cosf(-yaw_rad);
3249 const float sin_pitch = sinf(pitch_rad);
3250 const float cos_pitch = cosf(pitch_rad);
3251 const float sin_roll = sinf(roll_rad);
3252 const float cos_roll = cosf(roll_rad);
3257 m[0][0][0] = cos_yaw; m[0][0][1] = 0; m[0][0][2] = sin_yaw;
3258 m[0][1][0] = 0; m[0][1][1] = 1; m[0][1][2] = 0;
3259 m[0][2][0] = -sin_yaw; m[0][2][1] = 0; m[0][2][2] = cos_yaw;
3261 m[1][0][0] = 1; m[1][0][1] = 0; m[1][0][2] = 0;
3262 m[1][1][0] = 0; m[1][1][1] = cos_pitch; m[1][1][2] = -sin_pitch;
3263 m[1][2][0] = 0; m[1][2][1] = sin_pitch; m[1][2][2] = cos_pitch;
3265 m[2][0][0] = cos_roll; m[2][0][1] = -sin_roll; m[2][0][2] = 0;
3266 m[2][1][0] = sin_roll; m[2][1][1] = cos_roll; m[2][1][2] = 0;
3267 m[2][2][0] = 0; m[2][2][1] = 0; m[2][2][2] = 1;
3269 multiply_matrix(temp, m[rotation_order[0]], m[rotation_order[1]]);
3270 multiply_matrix(rot_mat, temp, m[rotation_order[2]]);
3274 * Rotate vector with given rotation matrix.
3276 * @param rot_mat rotation matrix
3279 static inline void rotate(const float rot_mat[3][3],
3282 const float x_tmp = vec[0] * rot_mat[0][0] + vec[1] * rot_mat[0][1] + vec[2] * rot_mat[0][2];
3283 const float y_tmp = vec[0] * rot_mat[1][0] + vec[1] * rot_mat[1][1] + vec[2] * rot_mat[1][2];
3284 const float z_tmp = vec[0] * rot_mat[2][0] + vec[1] * rot_mat[2][1] + vec[2] * rot_mat[2][2];
3291 static inline void set_mirror_modifier(int h_flip, int v_flip, int d_flip,
3294 modifier[0] = h_flip ? -1.f : 1.f;
3295 modifier[1] = v_flip ? -1.f : 1.f;
3296 modifier[2] = d_flip ? -1.f : 1.f;
3299 static inline void mirror(const float *modifier, float *vec)
3301 vec[0] *= modifier[0];
3302 vec[1] *= modifier[1];
3303 vec[2] *= modifier[2];
3306 static int allocate_plane(V360Context *s, int sizeof_uv, int sizeof_ker, int sizeof_mask, int p)
3309 s->u[p] = av_calloc(s->uv_linesize[p] * s->pr_height[p], sizeof_uv);
3311 s->v[p] = av_calloc(s->uv_linesize[p] * s->pr_height[p], sizeof_uv);
3312 if (!s->u[p] || !s->v[p])
3313 return AVERROR(ENOMEM);
3316 s->ker[p] = av_calloc(s->uv_linesize[p] * s->pr_height[p], sizeof_ker);
3318 return AVERROR(ENOMEM);
3321 if (sizeof_mask && !p) {
3323 s->mask = av_calloc(s->pr_width[p] * s->pr_height[p], sizeof_mask);
3325 return AVERROR(ENOMEM);
3331 static void fov_from_dfov(int format, float d_fov, float w, float h, float *h_fov, float *v_fov)
3336 const float d = 0.5f * hypotf(w, h);
3338 *h_fov = d / h * d_fov;
3339 *v_fov = d / w * d_fov;
3345 const float da = tanf(0.5 * FFMIN(d_fov, 359.f) * M_PI / 180.f);
3346 const float d = hypotf(w, h);
3348 *h_fov = atan2f(da * w, d) * 360.f / M_PI;
3349 *v_fov = atan2f(da * h, d) * 360.f / M_PI;
3360 static void set_dimensions(int *outw, int *outh, int w, int h, const AVPixFmtDescriptor *desc)
3362 outw[1] = outw[2] = FF_CEIL_RSHIFT(w, desc->log2_chroma_w);
3363 outw[0] = outw[3] = w;
3364 outh[1] = outh[2] = FF_CEIL_RSHIFT(h, desc->log2_chroma_h);
3365 outh[0] = outh[3] = h;
3368 // Calculate remap data
3369 static av_always_inline int v360_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
3371 V360Context *s = ctx->priv;
3373 for (int p = 0; p < s->nb_allocated; p++) {
3374 const int max_value = s->max_value;
3375 const int width = s->pr_width[p];
3376 const int uv_linesize = s->uv_linesize[p];
3377 const int height = s->pr_height[p];
3378 const int in_width = s->inplanewidth[p];
3379 const int in_height = s->inplaneheight[p];
3380 const int slice_start = (height * jobnr ) / nb_jobs;
3381 const int slice_end = (height * (jobnr + 1)) / nb_jobs;
3386 for (int j = slice_start; j < slice_end; j++) {
3387 for (int i = 0; i < width; i++) {
3388 int16_t *u = s->u[p] + (j * uv_linesize + i) * s->elements;
3389 int16_t *v = s->v[p] + (j * uv_linesize + i) * s->elements;
3390 int16_t *ker = s->ker[p] + (j * uv_linesize + i) * s->elements;
3391 uint8_t *mask8 = p ? NULL : s->mask + (j * s->pr_width[0] + i);
3392 uint16_t *mask16 = p ? NULL : (uint16_t *)s->mask + (j * s->pr_width[0] + i);
3393 int in_mask, out_mask;
3395 if (s->out_transpose)
3396 out_mask = s->out_transform(s, j, i, height, width, vec);
3398 out_mask = s->out_transform(s, i, j, width, height, vec);
3399 av_assert1(!isnan(vec[0]) && !isnan(vec[1]) && !isnan(vec[2]));
3400 rotate(s->rot_mat, vec);
3401 av_assert1(!isnan(vec[0]) && !isnan(vec[1]) && !isnan(vec[2]));
3402 normalize_vector(vec);
3403 mirror(s->output_mirror_modifier, vec);
3404 if (s->in_transpose)
3405 in_mask = s->in_transform(s, vec, in_height, in_width, rmap.v, rmap.u, &du, &dv);
3407 in_mask = s->in_transform(s, vec, in_width, in_height, rmap.u, rmap.v, &du, &dv);
3408 av_assert1(!isnan(du) && !isnan(dv));
3409 s->calculate_kernel(du, dv, &rmap, u, v, ker);
3411 if (!p && s->mask) {
3412 if (s->mask_size == 1) {
3413 mask8[0] = 255 * (out_mask & in_mask);
3415 mask16[0] = max_value * (out_mask & in_mask);
3425 static int config_output(AVFilterLink *outlink)
3427 AVFilterContext *ctx = outlink->src;
3428 AVFilterLink *inlink = ctx->inputs[0];
3429 V360Context *s = ctx->priv;
3430 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
3431 const int depth = desc->comp[0].depth;
3432 const int sizeof_mask = s->mask_size = (depth + 7) >> 3;
3437 int in_offset_h, in_offset_w;
3438 int out_offset_h, out_offset_w;
3440 int (*prepare_out)(AVFilterContext *ctx);
3443 s->max_value = (1 << depth) - 1;
3444 s->input_mirror_modifier[0] = s->ih_flip ? -1.f : 1.f;
3445 s->input_mirror_modifier[1] = s->iv_flip ? -1.f : 1.f;
3447 switch (s->interp) {
3449 s->calculate_kernel = nearest_kernel;
3450 s->remap_slice = depth <= 8 ? remap1_8bit_slice : remap1_16bit_slice;
3452 sizeof_uv = sizeof(int16_t) * s->elements;
3456 s->calculate_kernel = bilinear_kernel;
3457 s->remap_slice = depth <= 8 ? remap2_8bit_slice : remap2_16bit_slice;
3458 s->elements = 2 * 2;
3459 sizeof_uv = sizeof(int16_t) * s->elements;
3460 sizeof_ker = sizeof(int16_t) * s->elements;
3463 s->calculate_kernel = bicubic_kernel;
3464 s->remap_slice = depth <= 8 ? remap4_8bit_slice : remap4_16bit_slice;
3465 s->elements = 4 * 4;
3466 sizeof_uv = sizeof(int16_t) * s->elements;
3467 sizeof_ker = sizeof(int16_t) * s->elements;
3470 s->calculate_kernel = lanczos_kernel;
3471 s->remap_slice = depth <= 8 ? remap4_8bit_slice : remap4_16bit_slice;
3472 s->elements = 4 * 4;
3473 sizeof_uv = sizeof(int16_t) * s->elements;
3474 sizeof_ker = sizeof(int16_t) * s->elements;
3477 s->calculate_kernel = spline16_kernel;
3478 s->remap_slice = depth <= 8 ? remap4_8bit_slice : remap4_16bit_slice;
3479 s->elements = 4 * 4;
3480 sizeof_uv = sizeof(int16_t) * s->elements;
3481 sizeof_ker = sizeof(int16_t) * s->elements;
3484 s->calculate_kernel = gaussian_kernel;
3485 s->remap_slice = depth <= 8 ? remap4_8bit_slice : remap4_16bit_slice;
3486 s->elements = 4 * 4;
3487 sizeof_uv = sizeof(int16_t) * s->elements;
3488 sizeof_ker = sizeof(int16_t) * s->elements;
3494 ff_v360_init(s, depth);
3496 for (int order = 0; order < NB_RORDERS; order++) {
3497 const char c = s->rorder[order];
3501 av_log(ctx, AV_LOG_WARNING,
3502 "Incomplete rorder option. Direction for all 3 rotation orders should be specified. Switching to default rorder.\n");
3503 s->rotation_order[0] = YAW;
3504 s->rotation_order[1] = PITCH;
3505 s->rotation_order[2] = ROLL;
3509 rorder = get_rorder(c);
3511 av_log(ctx, AV_LOG_WARNING,
3512 "Incorrect rotation order symbol '%c' in rorder option. Switching to default rorder.\n", c);
3513 s->rotation_order[0] = YAW;
3514 s->rotation_order[1] = PITCH;
3515 s->rotation_order[2] = ROLL;
3519 s->rotation_order[order] = rorder;
3522 switch (s->in_stereo) {
3526 in_offset_w = in_offset_h = 0;
3544 set_dimensions(s->inplanewidth, s->inplaneheight, w, h, desc);
3545 set_dimensions(s->in_offset_w, s->in_offset_h, in_offset_w, in_offset_h, desc);
3547 s->in_width = s->inplanewidth[0];
3548 s->in_height = s->inplaneheight[0];
3550 if (s->id_fov > 0.f)
3551 fov_from_dfov(s->in, s->id_fov, w, h, &s->ih_fov, &s->iv_fov);
3553 if (s->in_transpose)
3554 FFSWAP(int, s->in_width, s->in_height);
3557 case EQUIRECTANGULAR:
3558 s->in_transform = xyz_to_equirect;
3564 s->in_transform = xyz_to_cube3x2;
3565 err = prepare_cube_in(ctx);
3570 s->in_transform = xyz_to_cube1x6;
3571 err = prepare_cube_in(ctx);
3576 s->in_transform = xyz_to_cube6x1;
3577 err = prepare_cube_in(ctx);
3582 s->in_transform = xyz_to_eac;
3583 err = prepare_eac_in(ctx);
3588 s->in_transform = xyz_to_flat;
3589 err = prepare_flat_in(ctx);
3595 av_log(ctx, AV_LOG_ERROR, "Supplied format is not accepted as input.\n");
3596 return AVERROR(EINVAL);
3598 s->in_transform = xyz_to_dfisheye;
3604 s->in_transform = xyz_to_barrel;
3610 s->in_transform = xyz_to_stereographic;
3611 err = prepare_stereographic_in(ctx);
3616 s->in_transform = xyz_to_mercator;
3622 s->in_transform = xyz_to_ball;
3628 s->in_transform = xyz_to_hammer;
3634 s->in_transform = xyz_to_sinusoidal;
3640 s->in_transform = xyz_to_fisheye;
3641 err = prepare_fisheye_in(ctx);
3646 s->in_transform = xyz_to_cylindrical;
3647 err = prepare_cylindrical_in(ctx);
3652 s->in_transform = xyz_to_tetrahedron;
3658 s->in_transform = xyz_to_barrelsplit;
3664 av_log(ctx, AV_LOG_ERROR, "Specified input format is not handled.\n");
3673 case EQUIRECTANGULAR:
3674 s->out_transform = equirect_to_xyz;
3680 s->out_transform = cube3x2_to_xyz;
3681 prepare_out = prepare_cube_out;
3682 w = lrintf(wf / 4.f * 3.f);
3686 s->out_transform = cube1x6_to_xyz;
3687 prepare_out = prepare_cube_out;
3688 w = lrintf(wf / 4.f);
3689 h = lrintf(hf * 3.f);
3692 s->out_transform = cube6x1_to_xyz;
3693 prepare_out = prepare_cube_out;
3694 w = lrintf(wf / 2.f * 3.f);
3695 h = lrintf(hf / 2.f);
3698 s->out_transform = eac_to_xyz;
3699 prepare_out = prepare_eac_out;
3701 h = lrintf(hf / 8.f * 9.f);
3704 s->out_transform = flat_to_xyz;
3705 prepare_out = prepare_flat_out;
3710 s->out_transform = dfisheye_to_xyz;
3716 s->out_transform = barrel_to_xyz;
3718 w = lrintf(wf / 4.f * 5.f);
3722 s->out_transform = stereographic_to_xyz;
3723 prepare_out = prepare_stereographic_out;
3725 h = lrintf(hf * 2.f);
3728 s->out_transform = mercator_to_xyz;
3731 h = lrintf(hf * 2.f);
3734 s->out_transform = ball_to_xyz;
3737 h = lrintf(hf * 2.f);
3740 s->out_transform = hammer_to_xyz;
3746 s->out_transform = sinusoidal_to_xyz;
3752 s->out_transform = fisheye_to_xyz;
3753 prepare_out = prepare_fisheye_out;
3754 w = lrintf(wf * 0.5f);
3758 s->out_transform = pannini_to_xyz;
3764 s->out_transform = cylindrical_to_xyz;
3765 prepare_out = prepare_cylindrical_out;
3767 h = lrintf(hf * 0.5f);
3770 s->out_transform = perspective_to_xyz;
3772 w = lrintf(wf / 2.f);
3776 s->out_transform = tetrahedron_to_xyz;
3782 s->out_transform = barrelsplit_to_xyz;
3784 w = lrintf(wf / 4.f * 3.f);
3788 av_log(ctx, AV_LOG_ERROR, "Specified output format is not handled.\n");
3792 // Override resolution with user values if specified
3793 if (s->width > 0 && s->height <= 0 && s->h_fov > 0.f && s->v_fov > 0.f &&
3794 s->out == FLAT && s->d_fov == 0.f) {
3796 h = w / tanf(s->h_fov * M_PI / 360.f) * tanf(s->v_fov * M_PI / 360.f);
3797 } else if (s->width <= 0 && s->height > 0 && s->h_fov > 0.f && s->v_fov > 0.f &&
3798 s->out == FLAT && s->d_fov == 0.f) {
3800 w = h / tanf(s->v_fov * M_PI / 360.f) * tanf(s->h_fov * M_PI / 360.f);
3801 } else if (s->width > 0 && s->height > 0) {
3804 } else if (s->width > 0 || s->height > 0) {
3805 av_log(ctx, AV_LOG_ERROR, "Both width and height values should be specified.\n");
3806 return AVERROR(EINVAL);
3808 if (s->out_transpose)
3811 if (s->in_transpose)
3819 fov_from_dfov(s->out, s->d_fov, w, h, &s->h_fov, &s->v_fov);
3822 err = prepare_out(ctx);
3827 set_dimensions(s->pr_width, s->pr_height, w, h, desc);
3829 s->out_width = s->pr_width[0];
3830 s->out_height = s->pr_height[0];
3832 if (s->out_transpose)
3833 FFSWAP(int, s->out_width, s->out_height);
3835 switch (s->out_stereo) {
3837 out_offset_w = out_offset_h = 0;
3853 set_dimensions(s->out_offset_w, s->out_offset_h, out_offset_w, out_offset_h, desc);
3854 set_dimensions(s->planewidth, s->planeheight, w, h, desc);
3856 for (int i = 0; i < 4; i++)
3857 s->uv_linesize[i] = FFALIGN(s->pr_width[i], 8);
3862 s->nb_planes = av_pix_fmt_count_planes(inlink->format);
3863 have_alpha = !!(desc->flags & AV_PIX_FMT_FLAG_ALPHA);
3865 if (desc->log2_chroma_h == desc->log2_chroma_w && desc->log2_chroma_h == 0) {
3866 s->nb_allocated = 1;
3867 s->map[0] = s->map[1] = s->map[2] = s->map[3] = 0;
3869 s->nb_allocated = 2;
3870 s->map[0] = s->map[3] = 0;
3871 s->map[1] = s->map[2] = 1;
3874 for (int i = 0; i < s->nb_allocated; i++)
3875 allocate_plane(s, sizeof_uv, sizeof_ker, sizeof_mask * have_alpha * s->alpha, i);
3877 calculate_rotation_matrix(s->yaw, s->pitch, s->roll, s->rot_mat, s->rotation_order);
3878 set_mirror_modifier(s->h_flip, s->v_flip, s->d_flip, s->output_mirror_modifier);
3880 ctx->internal->execute(ctx, v360_slice, NULL, NULL, FFMIN(outlink->h, ff_filter_get_nb_threads(ctx)));
3885 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
3887 AVFilterContext *ctx = inlink->dst;
3888 AVFilterLink *outlink = ctx->outputs[0];
3889 V360Context *s = ctx->priv;
3893 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
3896 return AVERROR(ENOMEM);
3898 av_frame_copy_props(out, in);
3903 ctx->internal->execute(ctx, s->remap_slice, &td, NULL, FFMIN(outlink->h, ff_filter_get_nb_threads(ctx)));
3906 return ff_filter_frame(outlink, out);
3909 static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
3910 char *res, int res_len, int flags)
3914 ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags);
3918 return config_output(ctx->outputs[0]);
3921 static av_cold void uninit(AVFilterContext *ctx)
3923 V360Context *s = ctx->priv;
3925 for (int p = 0; p < s->nb_allocated; p++) {
3928 av_freep(&s->ker[p]);
3933 static const AVFilterPad inputs[] = {
3936 .type = AVMEDIA_TYPE_VIDEO,
3937 .filter_frame = filter_frame,
3942 static const AVFilterPad outputs[] = {
3945 .type = AVMEDIA_TYPE_VIDEO,
3946 .config_props = config_output,
3951 AVFilter ff_vf_v360 = {
3953 .description = NULL_IF_CONFIG_SMALL("Convert 360 projection of video."),
3954 .priv_size = sizeof(V360Context),
3956 .query_formats = query_formats,
3959 .priv_class = &v360_class,
3960 .flags = AVFILTER_FLAG_SLICE_THREADS,
3961 .process_command = process_command,