| /* |
| * Copyright (c) 2019 Eugene Lyapustin |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /** |
| * @file |
| * 360 video conversion filter. |
| * Principle of operation: |
| * |
| * (for each pixel in output frame) |
| * 1) Calculate OpenGL-like coordinates (x, y, z) for pixel position (i, j) |
| * 2) Apply 360 operations (rotation, mirror) to (x, y, z) |
| * 3) Calculate pixel position (u, v) in input frame |
| * 4) Calculate interpolation window and weight for each pixel |
| * |
| * (for each frame) |
| * 5) Remap input frame to output frame using precalculated data |
| */ |
| |
| #include <math.h> |
| |
| #include "libavutil/avassert.h" |
| #include "libavutil/imgutils.h" |
| #include "libavutil/pixdesc.h" |
| #include "libavutil/opt.h" |
| #include "avfilter.h" |
| #include "formats.h" |
| #include "internal.h" |
| #include "video.h" |
| #include "v360.h" |
| |
| typedef struct ThreadData { |
| AVFrame *in; |
| AVFrame *out; |
| } ThreadData; |
| |
| #define OFFSET(x) offsetof(V360Context, x) |
| #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM |
| #define TFLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM |
| |
| static const AVOption v360_options[] = { |
| { "input", "set input projection", OFFSET(in), AV_OPT_TYPE_INT, {.i64=EQUIRECTANGULAR}, 0, NB_PROJECTIONS-1, FLAGS, "in" }, |
| { "e", "equirectangular", 0, AV_OPT_TYPE_CONST, {.i64=EQUIRECTANGULAR}, 0, 0, FLAGS, "in" }, |
| { "equirect", "equirectangular", 0, AV_OPT_TYPE_CONST, {.i64=EQUIRECTANGULAR}, 0, 0, FLAGS, "in" }, |
| { "c3x2", "cubemap 3x2", 0, AV_OPT_TYPE_CONST, {.i64=CUBEMAP_3_2}, 0, 0, FLAGS, "in" }, |
| { "c6x1", "cubemap 6x1", 0, AV_OPT_TYPE_CONST, {.i64=CUBEMAP_6_1}, 0, 0, FLAGS, "in" }, |
| { "eac", "equi-angular cubemap", 0, AV_OPT_TYPE_CONST, {.i64=EQUIANGULAR}, 0, 0, FLAGS, "in" }, |
| { "dfisheye", "dual fisheye", 0, AV_OPT_TYPE_CONST, {.i64=DUAL_FISHEYE}, 0, 0, FLAGS, "in" }, |
| { "flat", "regular video", 0, AV_OPT_TYPE_CONST, {.i64=FLAT}, 0, 0, FLAGS, "in" }, |
| {"rectilinear", "regular video", 0, AV_OPT_TYPE_CONST, {.i64=FLAT}, 0, 0, FLAGS, "in" }, |
| { "gnomonic", "regular video", 0, AV_OPT_TYPE_CONST, {.i64=FLAT}, 0, 0, FLAGS, "in" }, |
| { "barrel", "barrel facebook's 360 format", 0, AV_OPT_TYPE_CONST, {.i64=BARREL}, 0, 0, FLAGS, "in" }, |
| { "fb", "barrel facebook's 360 format", 0, AV_OPT_TYPE_CONST, {.i64=BARREL}, 0, 0, FLAGS, "in" }, |
| { "c1x6", "cubemap 1x6", 0, AV_OPT_TYPE_CONST, {.i64=CUBEMAP_1_6}, 0, 0, FLAGS, "in" }, |
| { "sg", "stereographic", 0, AV_OPT_TYPE_CONST, {.i64=STEREOGRAPHIC}, 0, 0, FLAGS, "in" }, |
| { "mercator", "mercator", 0, AV_OPT_TYPE_CONST, {.i64=MERCATOR}, 0, 0, FLAGS, "in" }, |
| { "ball", "ball", 0, AV_OPT_TYPE_CONST, {.i64=BALL}, 0, 0, FLAGS, "in" }, |
| { "hammer", "hammer", 0, AV_OPT_TYPE_CONST, {.i64=HAMMER}, 0, 0, FLAGS, "in" }, |
| {"sinusoidal", "sinusoidal", 0, AV_OPT_TYPE_CONST, {.i64=SINUSOIDAL}, 0, 0, FLAGS, "in" }, |
| { "fisheye", "fisheye", 0, AV_OPT_TYPE_CONST, {.i64=FISHEYE}, 0, 0, FLAGS, "in" }, |
| { "pannini", "pannini", 0, AV_OPT_TYPE_CONST, {.i64=PANNINI}, 0, 0, FLAGS, "in" }, |
| {"cylindrical", "cylindrical", 0, AV_OPT_TYPE_CONST, {.i64=CYLINDRICAL}, 0, 0, FLAGS, "in" }, |
| {"tetrahedron", "tetrahedron", 0, AV_OPT_TYPE_CONST, {.i64=TETRAHEDRON}, 0, 0, FLAGS, "in" }, |
| {"barrelsplit", "barrel split facebook's 360 format", 0, AV_OPT_TYPE_CONST, {.i64=BARREL_SPLIT}, 0, 0, FLAGS, "in" }, |
| { "tsp", "truncated square pyramid", 0, AV_OPT_TYPE_CONST, {.i64=TSPYRAMID}, 0, 0, FLAGS, "in" }, |
| { "hequirect", "half equirectangular", 0, AV_OPT_TYPE_CONST, {.i64=HEQUIRECTANGULAR},0, 0, FLAGS, "in" }, |
| { "he", "half equirectangular", 0, AV_OPT_TYPE_CONST, {.i64=HEQUIRECTANGULAR},0, 0, FLAGS, "in" }, |
| { "equisolid", "equisolid", 0, AV_OPT_TYPE_CONST, {.i64=EQUISOLID}, 0, 0, FLAGS, "in" }, |
| { "og", "orthographic", 0, AV_OPT_TYPE_CONST, {.i64=ORTHOGRAPHIC}, 0, 0, FLAGS, "in" }, |
| {"octahedron", "octahedron", 0, AV_OPT_TYPE_CONST, {.i64=OCTAHEDRON}, 0, 0, FLAGS, "in" }, |
| { "output", "set output projection", OFFSET(out), AV_OPT_TYPE_INT, {.i64=CUBEMAP_3_2}, 0, NB_PROJECTIONS-1, FLAGS, "out" }, |
| { "e", "equirectangular", 0, AV_OPT_TYPE_CONST, {.i64=EQUIRECTANGULAR}, 0, 0, FLAGS, "out" }, |
| { "equirect", "equirectangular", 0, AV_OPT_TYPE_CONST, {.i64=EQUIRECTANGULAR}, 0, 0, FLAGS, "out" }, |
| { "c3x2", "cubemap 3x2", 0, AV_OPT_TYPE_CONST, {.i64=CUBEMAP_3_2}, 0, 0, FLAGS, "out" }, |
| { "c6x1", "cubemap 6x1", 0, AV_OPT_TYPE_CONST, {.i64=CUBEMAP_6_1}, 0, 0, FLAGS, "out" }, |
| { "eac", "equi-angular cubemap", 0, AV_OPT_TYPE_CONST, {.i64=EQUIANGULAR}, 0, 0, FLAGS, "out" }, |
| { "dfisheye", "dual fisheye", 0, AV_OPT_TYPE_CONST, {.i64=DUAL_FISHEYE}, 0, 0, FLAGS, "out" }, |
| { "flat", "regular video", 0, AV_OPT_TYPE_CONST, {.i64=FLAT}, 0, 0, FLAGS, "out" }, |
| {"rectilinear", "regular video", 0, AV_OPT_TYPE_CONST, {.i64=FLAT}, 0, 0, FLAGS, "out" }, |
| { "gnomonic", "regular video", 0, AV_OPT_TYPE_CONST, {.i64=FLAT}, 0, 0, FLAGS, "out" }, |
| { "barrel", "barrel facebook's 360 format", 0, AV_OPT_TYPE_CONST, {.i64=BARREL}, 0, 0, FLAGS, "out" }, |
| { "fb", "barrel facebook's 360 format", 0, AV_OPT_TYPE_CONST, {.i64=BARREL}, 0, 0, FLAGS, "out" }, |
| { "c1x6", "cubemap 1x6", 0, AV_OPT_TYPE_CONST, {.i64=CUBEMAP_1_6}, 0, 0, FLAGS, "out" }, |
| { "sg", "stereographic", 0, AV_OPT_TYPE_CONST, {.i64=STEREOGRAPHIC}, 0, 0, FLAGS, "out" }, |
| { "mercator", "mercator", 0, AV_OPT_TYPE_CONST, {.i64=MERCATOR}, 0, 0, FLAGS, "out" }, |
| { "ball", "ball", 0, AV_OPT_TYPE_CONST, {.i64=BALL}, 0, 0, FLAGS, "out" }, |
| { "hammer", "hammer", 0, AV_OPT_TYPE_CONST, {.i64=HAMMER}, 0, 0, FLAGS, "out" }, |
| {"sinusoidal", "sinusoidal", 0, AV_OPT_TYPE_CONST, {.i64=SINUSOIDAL}, 0, 0, FLAGS, "out" }, |
| { "fisheye", "fisheye", 0, AV_OPT_TYPE_CONST, {.i64=FISHEYE}, 0, 0, FLAGS, "out" }, |
| { "pannini", "pannini", 0, AV_OPT_TYPE_CONST, {.i64=PANNINI}, 0, 0, FLAGS, "out" }, |
| {"cylindrical", "cylindrical", 0, AV_OPT_TYPE_CONST, {.i64=CYLINDRICAL}, 0, 0, FLAGS, "out" }, |
| {"perspective", "perspective", 0, AV_OPT_TYPE_CONST, {.i64=PERSPECTIVE}, 0, 0, FLAGS, "out" }, |
| {"tetrahedron", "tetrahedron", 0, AV_OPT_TYPE_CONST, {.i64=TETRAHEDRON}, 0, 0, FLAGS, "out" }, |
| {"barrelsplit", "barrel split facebook's 360 format", 0, AV_OPT_TYPE_CONST, {.i64=BARREL_SPLIT}, 0, 0, FLAGS, "out" }, |
| { "tsp", "truncated square pyramid", 0, AV_OPT_TYPE_CONST, {.i64=TSPYRAMID}, 0, 0, FLAGS, "out" }, |
| { "hequirect", "half equirectangular", 0, AV_OPT_TYPE_CONST, {.i64=HEQUIRECTANGULAR},0, 0, FLAGS, "out" }, |
| { "he", "half equirectangular", 0, AV_OPT_TYPE_CONST, {.i64=HEQUIRECTANGULAR},0, 0, FLAGS, "out" }, |
| { "equisolid", "equisolid", 0, AV_OPT_TYPE_CONST, {.i64=EQUISOLID}, 0, 0, FLAGS, "out" }, |
| { "og", "orthographic", 0, AV_OPT_TYPE_CONST, {.i64=ORTHOGRAPHIC}, 0, 0, FLAGS, "out" }, |
| {"octahedron", "octahedron", 0, AV_OPT_TYPE_CONST, {.i64=OCTAHEDRON}, 0, 0, FLAGS, "out" }, |
| { "interp", "set interpolation method", OFFSET(interp), AV_OPT_TYPE_INT, {.i64=BILINEAR}, 0, NB_INTERP_METHODS-1, FLAGS, "interp" }, |
| { "near", "nearest neighbour", 0, AV_OPT_TYPE_CONST, {.i64=NEAREST}, 0, 0, FLAGS, "interp" }, |
| { "nearest", "nearest neighbour", 0, AV_OPT_TYPE_CONST, {.i64=NEAREST}, 0, 0, FLAGS, "interp" }, |
| { "line", "bilinear interpolation", 0, AV_OPT_TYPE_CONST, {.i64=BILINEAR}, 0, 0, FLAGS, "interp" }, |
| { "linear", "bilinear interpolation", 0, AV_OPT_TYPE_CONST, {.i64=BILINEAR}, 0, 0, FLAGS, "interp" }, |
| { "lagrange9", "lagrange9 interpolation", 0, AV_OPT_TYPE_CONST, {.i64=LAGRANGE9}, 0, 0, FLAGS, "interp" }, |
| { "cube", "bicubic interpolation", 0, AV_OPT_TYPE_CONST, {.i64=BICUBIC}, 0, 0, FLAGS, "interp" }, |
| { "cubic", "bicubic interpolation", 0, AV_OPT_TYPE_CONST, {.i64=BICUBIC}, 0, 0, FLAGS, "interp" }, |
| { "lanc", "lanczos interpolation", 0, AV_OPT_TYPE_CONST, {.i64=LANCZOS}, 0, 0, FLAGS, "interp" }, |
| { "lanczos", "lanczos interpolation", 0, AV_OPT_TYPE_CONST, {.i64=LANCZOS}, 0, 0, FLAGS, "interp" }, |
| { "sp16", "spline16 interpolation", 0, AV_OPT_TYPE_CONST, {.i64=SPLINE16}, 0, 0, FLAGS, "interp" }, |
| { "spline16", "spline16 interpolation", 0, AV_OPT_TYPE_CONST, {.i64=SPLINE16}, 0, 0, FLAGS, "interp" }, |
| { "gauss", "gaussian interpolation", 0, AV_OPT_TYPE_CONST, {.i64=GAUSSIAN}, 0, 0, FLAGS, "interp" }, |
| { "gaussian", "gaussian interpolation", 0, AV_OPT_TYPE_CONST, {.i64=GAUSSIAN}, 0, 0, FLAGS, "interp" }, |
| { "mitchell", "mitchell interpolation", 0, AV_OPT_TYPE_CONST, {.i64=MITCHELL}, 0, 0, FLAGS, "interp" }, |
| { "w", "output width", OFFSET(width), AV_OPT_TYPE_INT, {.i64=0}, 0, INT16_MAX, FLAGS, "w"}, |
| { "h", "output height", OFFSET(height), AV_OPT_TYPE_INT, {.i64=0}, 0, INT16_MAX, FLAGS, "h"}, |
| { "in_stereo", "input stereo format", OFFSET(in_stereo), AV_OPT_TYPE_INT, {.i64=STEREO_2D}, 0, NB_STEREO_FMTS-1, FLAGS, "stereo" }, |
| {"out_stereo", "output stereo format", OFFSET(out_stereo), AV_OPT_TYPE_INT, {.i64=STEREO_2D}, 0, NB_STEREO_FMTS-1, FLAGS, "stereo" }, |
| { "2d", "2d mono", 0, AV_OPT_TYPE_CONST, {.i64=STEREO_2D}, 0, 0, FLAGS, "stereo" }, |
| { "sbs", "side by side", 0, AV_OPT_TYPE_CONST, {.i64=STEREO_SBS}, 0, 0, FLAGS, "stereo" }, |
| { "tb", "top bottom", 0, AV_OPT_TYPE_CONST, {.i64=STEREO_TB}, 0, 0, FLAGS, "stereo" }, |
| { "in_forder", "input cubemap face order", OFFSET(in_forder), AV_OPT_TYPE_STRING, {.str="rludfb"}, 0, NB_DIRECTIONS-1, FLAGS, "in_forder"}, |
| {"out_forder", "output cubemap face order", OFFSET(out_forder), AV_OPT_TYPE_STRING, {.str="rludfb"}, 0, NB_DIRECTIONS-1, FLAGS, "out_forder"}, |
| { "in_frot", "input cubemap face rotation", OFFSET(in_frot), AV_OPT_TYPE_STRING, {.str="000000"}, 0, NB_DIRECTIONS-1, FLAGS, "in_frot"}, |
| { "out_frot", "output cubemap face rotation",OFFSET(out_frot), AV_OPT_TYPE_STRING, {.str="000000"}, 0, NB_DIRECTIONS-1, FLAGS, "out_frot"}, |
| { "in_pad", "percent input cubemap pads", OFFSET(in_pad), AV_OPT_TYPE_FLOAT, {.dbl=0.f}, 0.f, 0.1,TFLAGS, "in_pad"}, |
| { "out_pad", "percent output cubemap pads", OFFSET(out_pad), AV_OPT_TYPE_FLOAT, {.dbl=0.f}, 0.f, 0.1,TFLAGS, "out_pad"}, |
| { "fin_pad", "fixed input cubemap pads", OFFSET(fin_pad), AV_OPT_TYPE_INT, {.i64=0}, 0, 100,TFLAGS, "fin_pad"}, |
| { "fout_pad", "fixed output cubemap pads", OFFSET(fout_pad), AV_OPT_TYPE_INT, {.i64=0}, 0, 100,TFLAGS, "fout_pad"}, |
| { "yaw", "yaw rotation", OFFSET(yaw), AV_OPT_TYPE_FLOAT, {.dbl=0.f}, -180.f, 180.f,TFLAGS, "yaw"}, |
| { "pitch", "pitch rotation", OFFSET(pitch), AV_OPT_TYPE_FLOAT, {.dbl=0.f}, -180.f, 180.f,TFLAGS, "pitch"}, |
| { "roll", "roll rotation", OFFSET(roll), AV_OPT_TYPE_FLOAT, {.dbl=0.f}, -180.f, 180.f,TFLAGS, "roll"}, |
| { "rorder", "rotation order", OFFSET(rorder), AV_OPT_TYPE_STRING, {.str="ypr"}, 0, 0,TFLAGS, "rorder"}, |
| { "h_fov", "output horizontal field of view",OFFSET(h_fov), AV_OPT_TYPE_FLOAT, {.dbl=90.f}, 0.00001f, 360.f,TFLAGS, "h_fov"}, |
| { "v_fov", "output vertical field of view", OFFSET(v_fov), AV_OPT_TYPE_FLOAT, {.dbl=45.f}, 0.00001f, 360.f,TFLAGS, "v_fov"}, |
| { "d_fov", "output diagonal field of view", OFFSET(d_fov), AV_OPT_TYPE_FLOAT, {.dbl=0.f}, 0.f, 360.f,TFLAGS, "d_fov"}, |
| { "h_flip", "flip out video horizontally", OFFSET(h_flip), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1,TFLAGS, "h_flip"}, |
| { "v_flip", "flip out video vertically", OFFSET(v_flip), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1,TFLAGS, "v_flip"}, |
| { "d_flip", "flip out video indepth", OFFSET(d_flip), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1,TFLAGS, "d_flip"}, |
| { "ih_flip", "flip in video horizontally", OFFSET(ih_flip), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1,TFLAGS, "ih_flip"}, |
| { "iv_flip", "flip in video vertically", OFFSET(iv_flip), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1,TFLAGS, "iv_flip"}, |
| { "in_trans", "transpose video input", OFFSET(in_transpose), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS, "in_transpose"}, |
| { "out_trans", "transpose video output", OFFSET(out_transpose), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS, "out_transpose"}, |
| { "ih_fov", "input horizontal field of view",OFFSET(ih_fov), AV_OPT_TYPE_FLOAT, {.dbl=90.f}, 0.00001f, 360.f,TFLAGS, "ih_fov"}, |
| { "iv_fov", "input vertical field of view", OFFSET(iv_fov), AV_OPT_TYPE_FLOAT, {.dbl=45.f}, 0.00001f, 360.f,TFLAGS, "iv_fov"}, |
| { "id_fov", "input diagonal field of view", OFFSET(id_fov), AV_OPT_TYPE_FLOAT, {.dbl=0.f}, 0.f, 360.f,TFLAGS, "id_fov"}, |
| {"alpha_mask", "build mask in alpha plane", OFFSET(alpha), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS, "alpha"}, |
| { NULL } |
| }; |
| |
| AVFILTER_DEFINE_CLASS(v360); |
| |
| static int query_formats(AVFilterContext *ctx) |
| { |
| V360Context *s = ctx->priv; |
| static const enum AVPixelFormat pix_fmts[] = { |
| // YUVA444 |
| AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA444P9, |
| AV_PIX_FMT_YUVA444P10, AV_PIX_FMT_YUVA444P12, |
| AV_PIX_FMT_YUVA444P16, |
| |
| // YUVA422 |
| AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA422P9, |
| AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA422P12, |
| AV_PIX_FMT_YUVA422P16, |
| |
| // YUVA420 |
| AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA420P9, |
| AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA420P16, |
| |
| // YUVJ |
| AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P, |
| AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P, |
| AV_PIX_FMT_YUVJ411P, |
| |
| // YUV444 |
| AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV444P9, |
| AV_PIX_FMT_YUV444P10, AV_PIX_FMT_YUV444P12, |
| AV_PIX_FMT_YUV444P14, AV_PIX_FMT_YUV444P16, |
| |
| // YUV440 |
| AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV440P10, |
| AV_PIX_FMT_YUV440P12, |
| |
| // YUV422 |
| AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV422P9, |
| AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV422P12, |
| AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV422P16, |
| |
| // YUV420 |
| AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV420P9, |
| AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV420P12, |
| AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV420P16, |
| |
| // YUV411 |
| AV_PIX_FMT_YUV411P, |
| |
| // YUV410 |
| AV_PIX_FMT_YUV410P, |
| |
| // GBR |
| AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRP9, |
| AV_PIX_FMT_GBRP10, AV_PIX_FMT_GBRP12, |
| AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16, |
| |
| // GBRA |
| AV_PIX_FMT_GBRAP, AV_PIX_FMT_GBRAP10, |
| AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRAP16, |
| |
| // GRAY |
| AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY9, |
| AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12, |
| AV_PIX_FMT_GRAY14, AV_PIX_FMT_GRAY16, |
| |
| AV_PIX_FMT_NONE |
| }; |
| static const enum AVPixelFormat alpha_pix_fmts[] = { |
| AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA444P9, |
| AV_PIX_FMT_YUVA444P10, AV_PIX_FMT_YUVA444P12, |
| AV_PIX_FMT_YUVA444P16, |
| AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA422P9, |
| AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA422P12, |
| AV_PIX_FMT_YUVA422P16, |
| AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA420P9, |
| AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA420P16, |
| AV_PIX_FMT_GBRAP, AV_PIX_FMT_GBRAP10, |
| AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRAP16, |
| AV_PIX_FMT_NONE |
| }; |
| |
| AVFilterFormats *fmts_list = ff_make_format_list(s->alpha ? alpha_pix_fmts : pix_fmts); |
| if (!fmts_list) |
| return AVERROR(ENOMEM); |
| return ff_set_common_formats(ctx, fmts_list); |
| } |
| |
| #define DEFINE_REMAP1_LINE(bits, div) \ |
| static void remap1_##bits##bit_line_c(uint8_t *dst, int width, const uint8_t *const src, \ |
| ptrdiff_t in_linesize, \ |
| const int16_t *const u, const int16_t *const v, \ |
| const int16_t *const ker) \ |
| { \ |
| const uint##bits##_t *const s = (const uint##bits##_t *const)src; \ |
| uint##bits##_t *d = (uint##bits##_t *)dst; \ |
| \ |
| in_linesize /= div; \ |
| \ |
| for (int x = 0; x < width; x++) \ |
| d[x] = s[v[x] * in_linesize + u[x]]; \ |
| } |
| |
| DEFINE_REMAP1_LINE( 8, 1) |
| DEFINE_REMAP1_LINE(16, 2) |
| |
| /** |
| * Generate remapping function with a given window size and pixel depth. |
| * |
| * @param ws size of interpolation window |
| * @param bits number of bits per pixel |
| */ |
| #define DEFINE_REMAP(ws, bits) \ |
| static int remap##ws##_##bits##bit_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs) \ |
| { \ |
| ThreadData *td = arg; \ |
| const V360Context *s = ctx->priv; \ |
| const SliceXYRemap *r = &s->slice_remap[jobnr]; \ |
| const AVFrame *in = td->in; \ |
| AVFrame *out = td->out; \ |
| \ |
| for (int stereo = 0; stereo < 1 + s->out_stereo > STEREO_2D; stereo++) { \ |
| for (int plane = 0; plane < s->nb_planes; plane++) { \ |
| const unsigned map = s->map[plane]; \ |
| const int in_linesize = in->linesize[plane]; \ |
| const int out_linesize = out->linesize[plane]; \ |
| const int uv_linesize = s->uv_linesize[plane]; \ |
| const int in_offset_w = stereo ? s->in_offset_w[plane] : 0; \ |
| const int in_offset_h = stereo ? s->in_offset_h[plane] : 0; \ |
| const int out_offset_w = stereo ? s->out_offset_w[plane] : 0; \ |
| const int out_offset_h = stereo ? s->out_offset_h[plane] : 0; \ |
| const uint8_t *const src = in->data[plane] + \ |
| in_offset_h * in_linesize + in_offset_w * (bits >> 3); \ |
| uint8_t *dst = out->data[plane] + out_offset_h * out_linesize + out_offset_w * (bits >> 3); \ |
| const uint8_t *mask = plane == 3 ? r->mask : NULL; \ |
| const int width = s->pr_width[plane]; \ |
| const int height = s->pr_height[plane]; \ |
| \ |
| const int slice_start = (height * jobnr ) / nb_jobs; \ |
| const int slice_end = (height * (jobnr + 1)) / nb_jobs; \ |
| \ |
| for (int y = slice_start; y < slice_end && !mask; y++) { \ |
| const int16_t *const u = r->u[map] + (y - slice_start) * uv_linesize * ws * ws; \ |
| const int16_t *const v = r->v[map] + (y - slice_start) * uv_linesize * ws * ws; \ |
| const int16_t *const ker = r->ker[map] + (y - slice_start) * uv_linesize * ws * ws; \ |
| \ |
| s->remap_line(dst + y * out_linesize, width, src, in_linesize, u, v, ker); \ |
| } \ |
| \ |
| for (int y = slice_start; y < slice_end && mask; y++) { \ |
| memcpy(dst + y * out_linesize, mask + \ |
| (y - slice_start) * width * (bits >> 3), width * (bits >> 3)); \ |
| } \ |
| } \ |
| } \ |
| \ |
| return 0; \ |
| } |
| |
| DEFINE_REMAP(1, 8) |
| DEFINE_REMAP(2, 8) |
| DEFINE_REMAP(3, 8) |
| DEFINE_REMAP(4, 8) |
| DEFINE_REMAP(1, 16) |
| DEFINE_REMAP(2, 16) |
| DEFINE_REMAP(3, 16) |
| DEFINE_REMAP(4, 16) |
| |
| #define DEFINE_REMAP_LINE(ws, bits, div) \ |
| static void remap##ws##_##bits##bit_line_c(uint8_t *dst, int width, const uint8_t *const src, \ |
| ptrdiff_t in_linesize, \ |
| const int16_t *const u, const int16_t *const v, \ |
| const int16_t *const ker) \ |
| { \ |
| const uint##bits##_t *const s = (const uint##bits##_t *const)src; \ |
| uint##bits##_t *d = (uint##bits##_t *)dst; \ |
| \ |
| in_linesize /= div; \ |
| \ |
| for (int x = 0; x < width; x++) { \ |
| const int16_t *const uu = u + x * ws * ws; \ |
| const int16_t *const vv = v + x * ws * ws; \ |
| const int16_t *const kker = ker + x * ws * ws; \ |
| int tmp = 0; \ |
| \ |
| for (int i = 0; i < ws; i++) { \ |
| const int iws = i * ws; \ |
| for (int j = 0; j < ws; j++) { \ |
| tmp += kker[iws + j] * s[vv[iws + j] * in_linesize + uu[iws + j]]; \ |
| } \ |
| } \ |
| \ |
| d[x] = av_clip_uint##bits(tmp >> 14); \ |
| } \ |
| } |
| |
| DEFINE_REMAP_LINE(2, 8, 1) |
| DEFINE_REMAP_LINE(3, 8, 1) |
| DEFINE_REMAP_LINE(4, 8, 1) |
| DEFINE_REMAP_LINE(2, 16, 2) |
| DEFINE_REMAP_LINE(3, 16, 2) |
| DEFINE_REMAP_LINE(4, 16, 2) |
| |
| void ff_v360_init(V360Context *s, int depth) |
| { |
| switch (s->interp) { |
| case NEAREST: |
| s->remap_line = depth <= 8 ? remap1_8bit_line_c : remap1_16bit_line_c; |
| break; |
| case BILINEAR: |
| s->remap_line = depth <= 8 ? remap2_8bit_line_c : remap2_16bit_line_c; |
| break; |
| case LAGRANGE9: |
| s->remap_line = depth <= 8 ? remap3_8bit_line_c : remap3_16bit_line_c; |
| break; |
| case BICUBIC: |
| case LANCZOS: |
| case SPLINE16: |
| case GAUSSIAN: |
| case MITCHELL: |
| s->remap_line = depth <= 8 ? remap4_8bit_line_c : remap4_16bit_line_c; |
| break; |
| } |
| |
| if (ARCH_X86) |
| ff_v360_init_x86(s, depth); |
| } |
| |
| /** |
| * Save nearest pixel coordinates for remapping. |
| * |
| * @param du horizontal relative coordinate |
| * @param dv vertical relative coordinate |
| * @param rmap calculated 4x4 window |
| * @param u u remap data |
| * @param v v remap data |
| * @param ker ker remap data |
| */ |
| static void nearest_kernel(float du, float dv, const XYRemap *rmap, |
| int16_t *u, int16_t *v, int16_t *ker) |
| { |
| const int i = lrintf(dv) + 1; |
| const int j = lrintf(du) + 1; |
| |
| u[0] = rmap->u[i][j]; |
| v[0] = rmap->v[i][j]; |
| } |
| |
| /** |
| * Calculate kernel for bilinear interpolation. |
| * |
| * @param du horizontal relative coordinate |
| * @param dv vertical relative coordinate |
| * @param rmap calculated 4x4 window |
| * @param u u remap data |
| * @param v v remap data |
| * @param ker ker remap data |
| */ |
| static void bilinear_kernel(float du, float dv, const XYRemap *rmap, |
| int16_t *u, int16_t *v, int16_t *ker) |
| { |
| for (int i = 0; i < 2; i++) { |
| for (int j = 0; j < 2; j++) { |
| u[i * 2 + j] = rmap->u[i + 1][j + 1]; |
| v[i * 2 + j] = rmap->v[i + 1][j + 1]; |
| } |
| } |
| |
| ker[0] = lrintf((1.f - du) * (1.f - dv) * 16385.f); |
| ker[1] = lrintf( du * (1.f - dv) * 16385.f); |
| ker[2] = lrintf((1.f - du) * dv * 16385.f); |
| ker[3] = lrintf( du * dv * 16385.f); |
| } |
| |
| /** |
| * Calculate 1-dimensional lagrange coefficients. |
| * |
| * @param t relative coordinate |
| * @param coeffs coefficients |
| */ |
| static inline void calculate_lagrange_coeffs(float t, float *coeffs) |
| { |
| coeffs[0] = (t - 1.f) * (t - 2.f) * 0.5f; |
| coeffs[1] = -t * (t - 2.f); |
| coeffs[2] = t * (t - 1.f) * 0.5f; |
| } |
| |
| /** |
| * Calculate kernel for lagrange interpolation. |
| * |
| * @param du horizontal relative coordinate |
| * @param dv vertical relative coordinate |
| * @param rmap calculated 4x4 window |
| * @param u u remap data |
| * @param v v remap data |
| * @param ker ker remap data |
| */ |
| static void lagrange_kernel(float du, float dv, const XYRemap *rmap, |
| int16_t *u, int16_t *v, int16_t *ker) |
| { |
| float du_coeffs[3]; |
| float dv_coeffs[3]; |
| |
| calculate_lagrange_coeffs(du, du_coeffs); |
| calculate_lagrange_coeffs(dv, dv_coeffs); |
| |
| for (int i = 0; i < 3; i++) { |
| for (int j = 0; j < 3; j++) { |
| u[i * 3 + j] = rmap->u[i + 1][j + 1]; |
| v[i * 3 + j] = rmap->v[i + 1][j + 1]; |
| ker[i * 3 + j] = lrintf(du_coeffs[j] * dv_coeffs[i] * 16385.f); |
| } |
| } |
| } |
| |
| /** |
| * Calculate 1-dimensional cubic coefficients. |
| * |
| * @param t relative coordinate |
| * @param coeffs coefficients |
| */ |
| static inline void calculate_bicubic_coeffs(float t, float *coeffs) |
| { |
| const float tt = t * t; |
| const float ttt = t * t * t; |
| |
| coeffs[0] = - t / 3.f + tt / 2.f - ttt / 6.f; |
| coeffs[1] = 1.f - t / 2.f - tt + ttt / 2.f; |
| coeffs[2] = t + tt / 2.f - ttt / 2.f; |
| coeffs[3] = - t / 6.f + ttt / 6.f; |
| } |
| |
| /** |
| * Calculate kernel for bicubic interpolation. |
| * |
| * @param du horizontal relative coordinate |
| * @param dv vertical relative coordinate |
| * @param rmap calculated 4x4 window |
| * @param u u remap data |
| * @param v v remap data |
| * @param ker ker remap data |
| */ |
| static void bicubic_kernel(float du, float dv, const XYRemap *rmap, |
| int16_t *u, int16_t *v, int16_t *ker) |
| { |
| float du_coeffs[4]; |
| float dv_coeffs[4]; |
| |
| calculate_bicubic_coeffs(du, du_coeffs); |
| calculate_bicubic_coeffs(dv, dv_coeffs); |
| |
| for (int i = 0; i < 4; i++) { |
| for (int j = 0; j < 4; j++) { |
| u[i * 4 + j] = rmap->u[i][j]; |
| v[i * 4 + j] = rmap->v[i][j]; |
| ker[i * 4 + j] = lrintf(du_coeffs[j] * dv_coeffs[i] * 16385.f); |
| } |
| } |
| } |
| |
| /** |
| * Calculate 1-dimensional lanczos coefficients. |
| * |
| * @param t relative coordinate |
| * @param coeffs coefficients |
| */ |
| static inline void calculate_lanczos_coeffs(float t, float *coeffs) |
| { |
| float sum = 0.f; |
| |
| for (int i = 0; i < 4; i++) { |
| const float x = M_PI * (t - i + 1); |
| if (x == 0.f) { |
| coeffs[i] = 1.f; |
| } else { |
| coeffs[i] = sinf(x) * sinf(x / 2.f) / (x * x / 2.f); |
| } |
| sum += coeffs[i]; |
| } |
| |
| for (int i = 0; i < 4; i++) { |
| coeffs[i] /= sum; |
| } |
| } |
| |
| /** |
| * Calculate kernel for lanczos interpolation. |
| * |
| * @param du horizontal relative coordinate |
| * @param dv vertical relative coordinate |
| * @param rmap calculated 4x4 window |
| * @param u u remap data |
| * @param v v remap data |
| * @param ker ker remap data |
| */ |
| static void lanczos_kernel(float du, float dv, const XYRemap *rmap, |
| int16_t *u, int16_t *v, int16_t *ker) |
| { |
| float du_coeffs[4]; |
| float dv_coeffs[4]; |
| |
| calculate_lanczos_coeffs(du, du_coeffs); |
| calculate_lanczos_coeffs(dv, dv_coeffs); |
| |
| for (int i = 0; i < 4; i++) { |
| for (int j = 0; j < 4; j++) { |
| u[i * 4 + j] = rmap->u[i][j]; |
| v[i * 4 + j] = rmap->v[i][j]; |
| ker[i * 4 + j] = lrintf(du_coeffs[j] * dv_coeffs[i] * 16385.f); |
| } |
| } |
| } |
| |
| /** |
| * Calculate 1-dimensional spline16 coefficients. |
| * |
| * @param t relative coordinate |
| * @param coeffs coefficients |
| */ |
| static void calculate_spline16_coeffs(float t, float *coeffs) |
| { |
| coeffs[0] = ((-1.f / 3.f * t + 0.8f) * t - 7.f / 15.f) * t; |
| coeffs[1] = ((t - 9.f / 5.f) * t - 0.2f) * t + 1.f; |
| coeffs[2] = ((6.f / 5.f - t) * t + 0.8f) * t; |
| coeffs[3] = ((1.f / 3.f * t - 0.2f) * t - 2.f / 15.f) * t; |
| } |
| |
| /** |
| * Calculate kernel for spline16 interpolation. |
| * |
| * @param du horizontal relative coordinate |
| * @param dv vertical relative coordinate |
| * @param rmap calculated 4x4 window |
| * @param u u remap data |
| * @param v v remap data |
| * @param ker ker remap data |
| */ |
| static void spline16_kernel(float du, float dv, const XYRemap *rmap, |
| int16_t *u, int16_t *v, int16_t *ker) |
| { |
| float du_coeffs[4]; |
| float dv_coeffs[4]; |
| |
| calculate_spline16_coeffs(du, du_coeffs); |
| calculate_spline16_coeffs(dv, dv_coeffs); |
| |
| for (int i = 0; i < 4; i++) { |
| for (int j = 0; j < 4; j++) { |
| u[i * 4 + j] = rmap->u[i][j]; |
| v[i * 4 + j] = rmap->v[i][j]; |
| ker[i * 4 + j] = lrintf(du_coeffs[j] * dv_coeffs[i] * 16385.f); |
| } |
| } |
| } |
| |
| /** |
| * Calculate 1-dimensional gaussian coefficients. |
| * |
| * @param t relative coordinate |
| * @param coeffs coefficients |
| */ |
| static void calculate_gaussian_coeffs(float t, float *coeffs) |
| { |
| float sum = 0.f; |
| |
| for (int i = 0; i < 4; i++) { |
| const float x = t - (i - 1); |
| if (x == 0.f) { |
| coeffs[i] = 1.f; |
| } else { |
| coeffs[i] = expf(-2.f * x * x) * expf(-x * x / 2.f); |
| } |
| sum += coeffs[i]; |
| } |
| |
| for (int i = 0; i < 4; i++) { |
| coeffs[i] /= sum; |
| } |
| } |
| |
| /** |
| * Calculate kernel for gaussian interpolation. |
| * |
| * @param du horizontal relative coordinate |
| * @param dv vertical relative coordinate |
| * @param rmap calculated 4x4 window |
| * @param u u remap data |
| * @param v v remap data |
| * @param ker ker remap data |
| */ |
| static void gaussian_kernel(float du, float dv, const XYRemap *rmap, |
| int16_t *u, int16_t *v, int16_t *ker) |
| { |
| float du_coeffs[4]; |
| float dv_coeffs[4]; |
| |
| calculate_gaussian_coeffs(du, du_coeffs); |
| calculate_gaussian_coeffs(dv, dv_coeffs); |
| |
| for (int i = 0; i < 4; i++) { |
| for (int j = 0; j < 4; j++) { |
| u[i * 4 + j] = rmap->u[i][j]; |
| v[i * 4 + j] = rmap->v[i][j]; |
| ker[i * 4 + j] = lrintf(du_coeffs[j] * dv_coeffs[i] * 16385.f); |
| } |
| } |
| } |
| |
| /** |
| * Calculate 1-dimensional cubic_bc_spline coefficients. |
| * |
| * @param t relative coordinate |
| * @param coeffs coefficients |
| */ |
| static void calculate_cubic_bc_coeffs(float t, float *coeffs, |
| float b, float c) |
| { |
| float sum = 0.f; |
| float p0 = (6.f - 2.f * b) / 6.f, |
| p2 = (-18.f + 12.f * b + 6.f * c) / 6.f, |
| p3 = (12.f - 9.f * b - 6.f * c) / 6.f, |
| q0 = (8.f * b + 24.f * c) / 6.f, |
| q1 = (-12.f * b - 48.f * c) / 6.f, |
| q2 = (6.f * b + 30.f * c) / 6.f, |
| q3 = (-b - 6.f * c) / 6.f; |
| |
| for (int i = 0; i < 4; i++) { |
| const float x = fabsf(t - i + 1.f); |
| if (x < 1.f) { |
| coeffs[i] = (p0 + x * x * (p2 + x * p3)) * |
| (p0 + x * x * (p2 + x * p3 / 2.f) / 4.f); |
| } else if (x < 2.f) { |
| coeffs[i] = (q0 + x * (q1 + x * (q2 + x * q3))) * |
| (q0 + x * (q1 + x * (q2 + x / 2.f * q3) / 2.f) / 2.f); |
| } else { |
| coeffs[i] = 0.f; |
| } |
| sum += coeffs[i]; |
| } |
| |
| for (int i = 0; i < 4; i++) { |
| coeffs[i] /= sum; |
| } |
| } |
| |
| /** |
| * Calculate kernel for mitchell interpolation. |
| * |
| * @param du horizontal relative coordinate |
| * @param dv vertical relative coordinate |
| * @param rmap calculated 4x4 window |
| * @param u u remap data |
| * @param v v remap data |
| * @param ker ker remap data |
| */ |
| static void mitchell_kernel(float du, float dv, const XYRemap *rmap, |
| int16_t *u, int16_t *v, int16_t *ker) |
| { |
| float du_coeffs[4]; |
| float dv_coeffs[4]; |
| |
| calculate_cubic_bc_coeffs(du, du_coeffs, 1.f / 3.f, 1.f / 3.f); |
| calculate_cubic_bc_coeffs(dv, dv_coeffs, 1.f / 3.f, 1.f / 3.f); |
| |
| for (int i = 0; i < 4; i++) { |
| for (int j = 0; j < 4; j++) { |
| u[i * 4 + j] = rmap->u[i][j]; |
| v[i * 4 + j] = rmap->v[i][j]; |
| ker[i * 4 + j] = lrintf(du_coeffs[j] * dv_coeffs[i] * 16385.f); |
| } |
| } |
| } |
| |
| /** |
| * Modulo operation with only positive remainders. |
| * |
| * @param a dividend |
| * @param b divisor |
| * |
| * @return positive remainder of (a / b) |
| */ |
| static inline int mod(int a, int b) |
| { |
| const int res = a % b; |
| if (res < 0) { |
| return res + b; |
| } else { |
| return res; |
| } |
| } |
| |
| /** |
| * Reflect y operation. |
| * |
| * @param y input vertical position |
| * @param h input height |
| */ |
| static inline int reflecty(int y, int h) |
| { |
| if (y < 0) { |
| y = -y; |
| } else if (y >= h) { |
| y = 2 * h - 1 - y; |
| } |
| |
| return av_clip(y, 0, h - 1); |
| } |
| |
| /** |
| * Reflect x operation for equirect. |
| * |
| * @param x input horizontal position |
| * @param y input vertical position |
| * @param w input width |
| * @param h input height |
| */ |
| static inline int ereflectx(int x, int y, int w, int h) |
| { |
| if (y < 0 || y >= h) |
| x += w / 2; |
| |
| return mod(x, w); |
| } |
| |
| /** |
| * Reflect x operation. |
| * |
| * @param x input horizontal position |
| * @param y input vertical position |
| * @param w input width |
| * @param h input height |
| */ |
| static inline int reflectx(int x, int y, int w, int h) |
| { |
| if (y < 0 || y >= h) |
| return w - 1 - x; |
| |
| return mod(x, w); |
| } |
| |
| /** |
| * Convert char to corresponding direction. |
| * Used for cubemap options. |
| */ |
| static int get_direction(char c) |
| { |
| switch (c) { |
| case 'r': |
| return RIGHT; |
| case 'l': |
| return LEFT; |
| case 'u': |
| return UP; |
| case 'd': |
| return DOWN; |
| case 'f': |
| return FRONT; |
| case 'b': |
| return BACK; |
| default: |
| return -1; |
| } |
| } |
| |
| /** |
| * Convert char to corresponding rotation angle. |
| * Used for cubemap options. |
| */ |
| static int get_rotation(char c) |
| { |
| switch (c) { |
| case '0': |
| return ROT_0; |
| case '1': |
| return ROT_90; |
| case '2': |
| return ROT_180; |
| case '3': |
| return ROT_270; |
| default: |
| return -1; |
| } |
| } |
| |
| /** |
| * Convert char to corresponding rotation order. |
| */ |
| static int get_rorder(char c) |
| { |
| switch (c) { |
| case 'Y': |
| case 'y': |
| return YAW; |
| case 'P': |
| case 'p': |
| return PITCH; |
| case 'R': |
| case 'r': |
| return ROLL; |
| default: |
| return -1; |
| } |
| } |
| |
| /** |
| * Prepare data for processing cubemap input format. |
| * |
| * @param ctx filter context |
| * |
| * @return error code |
| */ |
| static int prepare_cube_in(AVFilterContext *ctx) |
| { |
| V360Context *s = ctx->priv; |
| |
| for (int face = 0; face < NB_FACES; face++) { |
| const char c = s->in_forder[face]; |
| int direction; |
| |
| if (c == '\0') { |
| av_log(ctx, AV_LOG_ERROR, |
| "Incomplete in_forder option. Direction for all 6 faces should be specified.\n"); |
| return AVERROR(EINVAL); |
| } |
| |
| direction = get_direction(c); |
| if (direction == -1) { |
| av_log(ctx, AV_LOG_ERROR, |
| "Incorrect direction symbol '%c' in in_forder option.\n", c); |
| return AVERROR(EINVAL); |
| } |
| |
| s->in_cubemap_face_order[direction] = face; |
| } |
| |
| for (int face = 0; face < NB_FACES; face++) { |
| const char c = s->in_frot[face]; |
| int rotation; |
| |
| if (c == '\0') { |
| av_log(ctx, AV_LOG_ERROR, |
| "Incomplete in_frot option. Rotation for all 6 faces should be specified.\n"); |
| return AVERROR(EINVAL); |
| } |
| |
| rotation = get_rotation(c); |
| if (rotation == -1) { |
| av_log(ctx, AV_LOG_ERROR, |
| "Incorrect rotation symbol '%c' in in_frot option.\n", c); |
| return AVERROR(EINVAL); |
| } |
| |
| s->in_cubemap_face_rotation[face] = rotation; |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * Prepare data for processing cubemap output format. |
| * |
| * @param ctx filter context |
| * |
| * @return error code |
| */ |
| static int prepare_cube_out(AVFilterContext *ctx) |
| { |
| V360Context *s = ctx->priv; |
| |
| for (int face = 0; face < NB_FACES; face++) { |
| const char c = s->out_forder[face]; |
| int direction; |
| |
| if (c == '\0') { |
| av_log(ctx, AV_LOG_ERROR, |
| "Incomplete out_forder option. Direction for all 6 faces should be specified.\n"); |
| return AVERROR(EINVAL); |
| } |
| |
| direction = get_direction(c); |
| if (direction == -1) { |
| av_log(ctx, AV_LOG_ERROR, |
| "Incorrect direction symbol '%c' in out_forder option.\n", c); |
| return AVERROR(EINVAL); |
| } |
| |
| s->out_cubemap_direction_order[face] = direction; |
| } |
| |
| for (int face = 0; face < NB_FACES; face++) { |
| const char c = s->out_frot[face]; |
| int rotation; |
| |
| if (c == '\0') { |
| av_log(ctx, AV_LOG_ERROR, |
| "Incomplete out_frot option. Rotation for all 6 faces should be specified.\n"); |
| return AVERROR(EINVAL); |
| } |
| |
| rotation = get_rotation(c); |
| if (rotation == -1) { |
| av_log(ctx, AV_LOG_ERROR, |
| "Incorrect rotation symbol '%c' in out_frot option.\n", c); |
| return AVERROR(EINVAL); |
| } |
| |
| s->out_cubemap_face_rotation[face] = rotation; |
| } |
| |
| return 0; |
| } |
| |
| static inline void rotate_cube_face(float *uf, float *vf, int rotation) |
| { |
| float tmp; |
| |
| switch (rotation) { |
| case ROT_0: |
| break; |
| case ROT_90: |
| tmp = *uf; |
| *uf = -*vf; |
| *vf = tmp; |
| break; |
| case ROT_180: |
| *uf = -*uf; |
| *vf = -*vf; |
| break; |
| case ROT_270: |
| tmp = -*uf; |
| *uf = *vf; |
| *vf = tmp; |
| break; |
| default: |
| av_assert0(0); |
| } |
| } |
| |
| static inline void rotate_cube_face_inverse(float *uf, float *vf, int rotation) |
| { |
| float tmp; |
| |
| switch (rotation) { |
| case ROT_0: |
| break; |
| case ROT_90: |
| tmp = -*uf; |
| *uf = *vf; |
| *vf = tmp; |
| break; |
| case ROT_180: |
| *uf = -*uf; |
| *vf = -*vf; |
| break; |
| case ROT_270: |
| tmp = *uf; |
| *uf = -*vf; |
| *vf = tmp; |
| break; |
| default: |
| av_assert0(0); |
| } |
| } |
| |
| /** |
| * Normalize vector. |
| * |
| * @param vec vector |
| */ |
| static void normalize_vector(float *vec) |
| { |
| const float norm = sqrtf(vec[0] * vec[0] + vec[1] * vec[1] + vec[2] * vec[2]); |
| |
| vec[0] /= norm; |
| vec[1] /= norm; |
| vec[2] /= norm; |
| } |
| |
| /** |
| * Calculate 3D coordinates on sphere for corresponding cubemap position. |
| * Common operation for every cubemap. |
| * |
| * @param s filter private context |
| * @param uf horizontal cubemap coordinate [0, 1) |
| * @param vf vertical cubemap coordinate [0, 1) |
| * @param face face of cubemap |
| * @param vec coordinates on sphere |
| * @param scalew scale for uf |
| * @param scaleh scale for vf |
| */ |
| static void cube_to_xyz(const V360Context *s, |
| float uf, float vf, int face, |
| float *vec, float scalew, float scaleh) |
| { |
| const int direction = s->out_cubemap_direction_order[face]; |
| float l_x, l_y, l_z; |
| |
| uf /= scalew; |
| vf /= scaleh; |
| |
| rotate_cube_face_inverse(&uf, &vf, s->out_cubemap_face_rotation[face]); |
| |
| switch (direction) { |
| case RIGHT: |
| l_x = 1.f; |
| l_y = vf; |
| l_z = -uf; |
| break; |
| case LEFT: |
| l_x = -1.f; |
| l_y = vf; |
| l_z = uf; |
| break; |
| case UP: |
| l_x = uf; |
| l_y = -1.f; |
| l_z = vf; |
| break; |
| case DOWN: |
| l_x = uf; |
| l_y = 1.f; |
| l_z = -vf; |
| break; |
| case FRONT: |
| l_x = uf; |
| l_y = vf; |
| l_z = 1.f; |
| break; |
| case BACK: |
| l_x = -uf; |
| l_y = vf; |
| l_z = -1.f; |
| break; |
| default: |
| av_assert0(0); |
| } |
| |
| vec[0] = l_x; |
| vec[1] = l_y; |
| vec[2] = l_z; |
| |
| normalize_vector(vec); |
| } |
| |
| /** |
| * Calculate cubemap position for corresponding 3D coordinates on sphere. |
| * Common operation for every cubemap. |
| * |
| * @param s filter private context |
| * @param vec coordinated on sphere |
| * @param uf horizontal cubemap coordinate [0, 1) |
| * @param vf vertical cubemap coordinate [0, 1) |
| * @param direction direction of view |
| */ |
| static void xyz_to_cube(const V360Context *s, |
| const float *vec, |
| float *uf, float *vf, int *direction) |
| { |
| const float phi = atan2f(vec[0], vec[2]); |
| const float theta = asinf(vec[1]); |
| float phi_norm, theta_threshold; |
| int face; |
| |
| if (phi >= -M_PI_4 && phi < M_PI_4) { |
| *direction = FRONT; |
| phi_norm = phi; |
| } else if (phi >= -(M_PI_2 + M_PI_4) && phi < -M_PI_4) { |
| *direction = LEFT; |
| phi_norm = phi + M_PI_2; |
| } else if (phi >= M_PI_4 && phi < M_PI_2 + M_PI_4) { |
| *direction = RIGHT; |
| phi_norm = phi - M_PI_2; |
| } else { |
| *direction = BACK; |
| phi_norm = phi + ((phi > 0.f) ? -M_PI : M_PI); |
| } |
| |
| theta_threshold = atanf(cosf(phi_norm)); |
| if (theta > theta_threshold) { |
| *direction = DOWN; |
| } else if (theta < -theta_threshold) { |
| *direction = UP; |
| } |
| |
| switch (*direction) { |
| case RIGHT: |
| *uf = -vec[2] / vec[0]; |
| *vf = vec[1] / vec[0]; |
| break; |
| case LEFT: |
| *uf = -vec[2] / vec[0]; |
| *vf = -vec[1] / vec[0]; |
| break; |
| case UP: |
| *uf = -vec[0] / vec[1]; |
| *vf = -vec[2] / vec[1]; |
| break; |
| case DOWN: |
| *uf = vec[0] / vec[1]; |
| *vf = -vec[2] / vec[1]; |
| break; |
| case FRONT: |
| *uf = vec[0] / vec[2]; |
| *vf = vec[1] / vec[2]; |
| break; |
| case BACK: |
| *uf = vec[0] / vec[2]; |
| *vf = -vec[1] / vec[2]; |
| break; |
| default: |
| av_assert0(0); |
| } |
| |
| face = s->in_cubemap_face_order[*direction]; |
| rotate_cube_face(uf, vf, s->in_cubemap_face_rotation[face]); |
| } |
| |
| /** |
| * Find position on another cube face in case of overflow/underflow. |
| * Used for calculation of interpolation window. |
| * |
| * @param s filter private context |
| * @param uf horizontal cubemap coordinate |
| * @param vf vertical cubemap coordinate |
| * @param direction direction of view |
| * @param new_uf new horizontal cubemap coordinate |
| * @param new_vf new vertical cubemap coordinate |
| * @param face face position on cubemap |
| */ |
| static void process_cube_coordinates(const V360Context *s, |
| float uf, float vf, int direction, |
| float *new_uf, float *new_vf, int *face) |
| { |
| /* |
| * Cubemap orientation |
| * |
| * width |
| * <-------> |
| * +-------+ |
| * | | U |
| * | up | h -------> |
| * +-------+-------+-------+-------+ ^ e | |
| * | | | | | | i V | |
| * | left | front | right | back | | g | |
| * +-------+-------+-------+-------+ v h v |
| * | | t |
| * | down | |
| * +-------+ |
| */ |
| |
| *face = s->in_cubemap_face_order[direction]; |
| rotate_cube_face_inverse(&uf, &vf, s->in_cubemap_face_rotation[*face]); |
| |
| if ((uf < -1.f || uf >= 1.f) && (vf < -1.f || vf >= 1.f)) { |
| // There are no pixels to use in this case |
| *new_uf = uf; |
| *new_vf = vf; |
| } else if (uf < -1.f) { |
| uf += 2.f; |
| switch (direction) { |
| case RIGHT: |
| direction = FRONT; |
| *new_uf = uf; |
| *new_vf = vf; |
| break; |
| case LEFT: |
| direction = BACK; |
| *new_uf = uf; |
| *new_vf = vf; |
| break; |
| case UP: |
| direction = LEFT; |
| *new_uf = vf; |
| *new_vf = -uf; |
| break; |
| case DOWN: |
| direction = LEFT; |
| *new_uf = -vf; |
| *new_vf = uf; |
| break; |
| case FRONT: |
| direction = LEFT; |
| *new_uf = uf; |
| *new_vf = vf; |
| break; |
| case BACK: |
| direction = RIGHT; |
| *new_uf = uf; |
| *new_vf = vf; |
| break; |
| default: |
| av_assert0(0); |
| } |
| } else if (uf >= 1.f) { |
| uf -= 2.f; |
| switch (direction) { |
| case RIGHT: |
| direction = BACK; |
| *new_uf = uf; |
| *new_vf = vf; |
| break; |
| case LEFT: |
| direction = FRONT; |
| *new_uf = uf; |
| *new_vf = vf; |
| break; |
| case UP: |
| direction = RIGHT; |
| *new_uf = -vf; |
| *new_vf = uf; |
| break; |
| case DOWN: |
| direction = RIGHT; |
| *new_uf = vf; |
| *new_vf = -uf; |
| break; |
| case FRONT: |
| direction = RIGHT; |
| *new_uf = uf; |
| *new_vf = vf; |
| break; |
| case BACK: |
| direction = LEFT; |
| *new_uf = uf; |
| *new_vf = vf; |
| break; |
| default: |
| av_assert0(0); |
| } |
| } else if (vf < -1.f) { |
| vf += 2.f; |
| switch (direction) { |
| case RIGHT: |
| direction = UP; |
| *new_uf = vf; |
| *new_vf = -uf; |
| break; |
| case LEFT: |
| direction = UP; |
| *new_uf = -vf; |
| *new_vf = uf; |
| break; |
| case UP: |
| direction = BACK; |
| *new_uf = -uf; |
| *new_vf = -vf; |
| break; |
| case DOWN: |
| direction = FRONT; |
| *new_uf = uf; |
| *new_vf = vf; |
| break; |
| case FRONT: |
| direction = UP; |
| *new_uf = uf; |
| *new_vf = vf; |
| break; |
| case BACK: |
| direction = UP; |
| *new_uf = -uf; |
| *new_vf = -vf; |
| break; |
| default: |
| av_assert0(0); |
| } |
| } else if (vf >= 1.f) { |
| vf -= 2.f; |
| switch (direction) { |
| case RIGHT: |
| direction = DOWN; |
| *new_uf = -vf; |
| *new_vf = uf; |
| break; |
| case LEFT: |
| direction = DOWN; |
| *new_uf = vf; |
| *new_vf = -uf; |
| break; |
| case UP: |
| direction = FRONT; |
| *new_uf = uf; |
| *new_vf = vf; |
| break; |
| case DOWN: |
| direction = BACK; |
| *new_uf = -uf; |
| *new_vf = -vf; |
| break; |
| case FRONT: |
| direction = DOWN; |
| *new_uf = uf; |
| *new_vf = vf; |
| break; |
| case BACK: |
| direction = DOWN; |
| *new_uf = -uf; |
| *new_vf = -vf; |
| break; |
| default: |
| av_assert0(0); |
| } |
| } else { |
| // Inside cube face |
| *new_uf = uf; |
| *new_vf = vf; |
| } |
| |
| *face = s->in_cubemap_face_order[direction]; |
| rotate_cube_face(new_uf, new_vf, s->in_cubemap_face_rotation[*face]); |
| } |
| |
| /** |
| * Calculate 3D coordinates on sphere for corresponding frame position in cubemap3x2 format. |
| * |
| * @param s filter private context |
| * @param i horizontal position on frame [0, width) |
| * @param j vertical position on frame [0, height) |
| * @param width frame width |
| * @param height frame height |
| * @param vec coordinates on sphere |
| */ |
| static int cube3x2_to_xyz(const V360Context *s, |
| int i, int j, int width, int height, |
| float *vec) |
| { |
| const float scalew = s->fout_pad > 0 ? 1.f - s->fout_pad / (width / 3.f) : 1.f - s->out_pad; |
| const float scaleh = s->fout_pad > 0 ? 1.f - s->fout_pad / (height / 2.f) : 1.f - s->out_pad; |
| |
| const float ew = width / 3.f; |
| const float eh = height / 2.f; |
| |
| const int u_face = floorf(i / ew); |
| const int v_face = floorf(j / eh); |
| const int face = u_face + 3 * v_face; |
| |
| const int u_shift = ceilf(ew * u_face); |
| const int v_shift = ceilf(eh * v_face); |
| const int ewi = ceilf(ew * (u_face + 1)) - u_shift; |
| const int ehi = ceilf(eh * (v_face + 1)) - v_shift; |
| |
| const float uf = 2.f * (i - u_shift + 0.5f) / ewi - 1.f; |
| const float vf = 2.f * (j - v_shift + 0.5f) / ehi - 1.f; |
| |
| cube_to_xyz(s, uf, vf, face, vec, scalew, scaleh); |
| |
| return 1; |
| } |
| |
| /** |
| * Calculate frame position in cubemap3x2 format for corresponding 3D coordinates on sphere. |
| * |
| * @param s filter private context |
| * @param vec coordinates on sphere |
| * @param width frame width |
| * @param height frame height |
| * @param us horizontal coordinates for interpolation window |
| * @param vs vertical coordinates for interpolation window |
| * @param du horizontal relative coordinate |
| * @param dv vertical relative coordinate |
| */ |
| static int xyz_to_cube3x2(const V360Context *s, |
| const float *vec, int width, int height, |
| int16_t us[4][4], int16_t vs[4][4], float *du, float *dv) |
| { |
| const float scalew = s->fin_pad > 0 ? 1.f - s->fin_pad / (width / 3.f) : 1.f - s->in_pad; |
| const float scaleh = s->fin_pad > 0 ? 1.f - s->fin_pad / (height / 2.f) : 1.f - s->in_pad; |
| const float ew = width / 3.f; |
| const float eh = height / 2.f; |
| float uf, vf; |
| int ui, vi; |
| int ewi, ehi; |
| int direction, face; |
| int u_face, v_face; |
| |
| xyz_to_cube(s, vec, &uf, &vf, &direction); |
| |
| uf *= scalew; |
| vf *= scaleh; |
| |
| face = s->in_cubemap_face_order[direction]; |
| u_face = face % 3; |
| v_face = face / 3; |
| ewi = ceilf(ew * (u_face + 1)) - ceilf(ew * u_face); |
| ehi = ceilf(eh * (v_face + 1)) - ceilf(eh * v_face); |
| |
| uf = 0.5f * ewi * (uf + 1.f) - 0.5f; |
| vf = 0.5f * ehi * (vf + 1.f) - 0.5f; |
| |
| ui = floorf(uf); |
| vi = floorf(vf); |
| |
| *du = uf - ui; |
| *dv = vf - vi; |
| |
| for (int i = 0; i < 4; i++) { |
| for (int j = 0; j < 4; j++) { |
| int new_ui = ui + j - 1; |
| int new_vi = vi + i - 1; |
| int u_shift, v_shift; |
| int new_ewi, new_ehi; |
| |
| if (new_ui >= 0 && new_ui < ewi && new_vi >= 0 && new_vi < ehi) { |
| face = s->in_cubemap_face_order[direction]; |
| |
| u_face = face % 3; |
| v_face = face / 3; |
| u_shift = ceilf(ew * u_face); |
| v_shift = ceilf(eh * v_face); |
| } else { |
| uf = 2.f * new_ui / ewi - 1.f; |
| vf = 2.f * new_vi / ehi - 1.f; |
| |
| uf /= scalew; |
| vf /= scaleh; |
| |
| process_cube_coordinates(s, uf, vf, direction, &uf, &vf, &face); |
| |
| uf *= scalew; |
| vf *= scaleh; |
| |
| u_face = face % 3; |
| v_face = face / 3; |
| u_shift = ceilf(ew * u_face); |
| v_shift = ceilf(eh * v_face); |
| new_ewi = ceilf(ew * (u_face + 1)) - u_shift; |
| new_ehi = ceilf(eh * (v_face + 1)) - v_shift; |
| |
| new_ui = av_clip(lrintf(0.5f * new_ewi * (uf + 1.f)), 0, new_ewi - 1); |
| new_vi = av_clip(lrintf(0.5f * new_ehi * (vf + 1.f)), 0, new_ehi - 1); |
| } |
| |
| us[i][j] = u_shift + new_ui; |
| vs[i][j] = v_shift + new_vi; |
| } |
| } |
| |
| return 1; |
| } |
| |
| /** |
| * Calculate 3D coordinates on sphere for corresponding frame position in cubemap1x6 format. |
| * |
| * @param s filter private context |
| * @param i horizontal position on frame [0, width) |
| * @param j vertical position on frame [0, height) |
| * @param width frame width |
| * @param height frame height |
| * @param vec coordinates on sphere |
| */ |
| static int cube1x6_to_xyz(const V360Context *s, |
| int i, int j, int width, int height, |
| float *vec) |
| { |
| const float scalew = s->fout_pad > 0 ? 1.f - (float)(s->fout_pad) / width : 1.f - s->out_pad; |
| const float scaleh = s->fout_pad > 0 ? 1.f - s->fout_pad / (height / 6.f) : 1.f - s->out_pad; |
| |
| const float ew = width; |
| const float eh = height / 6.f; |
| |
| const int face = floorf(j / eh); |
| |
| const int v_shift = ceilf(eh * face); |
| const int ehi = ceilf(eh * (face + 1)) - v_shift; |
| |
| const float uf = 2.f * (i + 0.5f) / ew - 1.f; |
| const float vf = 2.f * (j - v_shift + 0.5f) / ehi - 1.f; |
| |
| cube_to_xyz(s, uf, vf, face, vec, scalew, scaleh); |
| |
| return 1; |
| } |
| |
| /** |
| * Calculate 3D coordinates on sphere for corresponding frame position in cubemap6x1 format. |
| * |
| * @param s filter private context |
| * @param i horizontal position on frame [0, width) |
| * @param j vertical position on frame [0, height) |
| * @param width frame width |
| * @param height frame height |
| * @param vec coordinates on sphere |
| */ |
| static int cube6x1_to_xyz(const V360Context *s, |
| int i, int j, int width, int height, |
| float *vec) |
| { |
| const float scalew = s->fout_pad > 0 ? 1.f - s->fout_pad / (width / 6.f) : 1.f - s->out_pad; |
| const float scaleh = s->fout_pad > 0 ? 1.f - (float)(s->fout_pad) / height : 1.f - s->out_pad; |
| |
| const float ew = width / 6.f; |
| const float eh = height; |
| |
| const int face = floorf(i / ew); |
| |
| const int u_shift = ceilf(ew * face); |
| const int ewi = ceilf(ew * (face + 1)) - u_shift; |
| |
| const float uf = 2.f * (i - u_shift + 0.5f) / ewi - 1.f; |
| const float vf = 2.f * (j + 0.5f) / eh - 1.f; |
| |
| cube_to_xyz(s, uf, vf, face, vec, scalew, scaleh); |
| |
| return 1; |
| } |
| |
| /** |
| * Calculate frame position in cubemap1x6 format for corresponding 3D coordinates on sphere. |
| * |
| * @param s filter private context |
| * @param vec coordinates on sphere |
| * @param width frame width |
| * @param height frame height |
| * @param us horizontal coordinates for interpolation window |
| * @param vs vertical coordinates for interpolation window |
| * @param du horizontal relative coordinate |
| * @param dv vertical relative coordinate |
| */ |
| static int xyz_to_cube1x6(const V360Context *s, |
| const float *vec, int width, int height, |
| int16_t us[4][4], int16_t vs[4][4], float *du, float *dv) |
| { |
| const float scalew = s->fin_pad > 0 ? 1.f - (float)(s->fin_pad) / width : 1.f - s->in_pad; |
| const float scaleh = s->fin_pad > 0 ? 1.f - s->fin_pad / (height / 6.f) : 1.f - s->in_pad; |
| const float eh = height / 6.f; |
| const int ewi = width; |
| float uf, vf; |
| int ui, vi; |
| int ehi; |
| int direction, face; |
| |
| xyz_to_cube(s, vec, &uf, &vf, &direction); |
| |
| uf *= scalew; |
| vf *= scaleh; |
| |
| face = s->in_cubemap_face_order[direction]; |
| ehi = ceilf(eh * (face + 1)) - ceilf(eh * face); |
| |
| uf = 0.5f * ewi * (uf + 1.f) - 0.5f; |
| vf = 0.5f * ehi * (vf + 1.f) - 0.5f; |
| |
| ui = floorf(uf); |
| vi = floorf(vf); |
| |
| *du = uf - ui; |
| *dv = vf - vi; |
| |
| for (int i = 0; i < 4; i++) { |
| for (int j = 0; j < 4; j++) { |
| int new_ui = ui + j - 1; |
| int new_vi = vi + i - 1; |
| int v_shift; |
| int new_ehi; |
| |
| if (new_ui >= 0 && new_ui < ewi && new_vi >= 0 && new_vi < ehi) { |
| face = s->in_cubemap_face_order[direction]; |
| |
| v_shift = ceilf(eh * face); |
| } else { |
| uf = 2.f * new_ui / ewi - 1.f; |
| vf = 2.f * new_vi / ehi - 1.f; |
| |
| uf /= scalew; |
| vf /= scaleh; |
| |
| process_cube_coordinates(s, uf, vf, direction, &uf, &vf, &face); |
| |
| uf *= scalew; |
| vf *= scaleh; |
| |
| v_shift = ceilf(eh * face); |
| new_ehi = ceilf(eh * (face + 1)) - v_shift; |
| |
| new_ui = av_clip(lrintf(0.5f * ewi * (uf + 1.f)), 0, ewi - 1); |
| new_vi = av_clip(lrintf(0.5f * new_ehi * (vf + 1.f)), 0, new_ehi - 1); |
| } |
| |
| us[i][j] = new_ui; |
| vs[i][j] = v_shift + new_vi; |
| } |
| } |
| |
| return 1; |
| } |
| |
| /** |
| * Calculate frame position in cubemap6x1 format for corresponding 3D coordinates on sphere. |
| * |
| * @param s filter private context |
| * @param vec coordinates on sphere |
| * @param width frame width |
| * @param height frame height |
| * @param us horizontal coordinates for interpolation window |
| * @param vs vertical coordinates for interpolation window |
| * @param du horizontal relative coordinate |
| * @param dv vertical relative coordinate |
| */ |
| static int xyz_to_cube6x1(const V360Context *s, |
| const float *vec, int width, int height, |
| int16_t us[4][4], int16_t vs[4][4], float *du, float *dv) |
| { |
| const float scalew = s->fin_pad > 0 ? 1.f - s->fin_pad / (width / 6.f) : 1.f - s->in_pad; |
| const float scaleh = s->fin_pad > 0 ? 1.f - (float)(s->fin_pad) / height : 1.f - s->in_pad; |
| const float ew = width / 6.f; |
| const int ehi = height; |
| float uf, vf; |
| int ui, vi; |
| int ewi; |
| int direction, face; |
| |
| xyz_to_cube(s, vec, &uf, &vf, &direction); |
| |
| uf *= scalew; |
| vf *= scaleh; |
| |
| face = s->in_cubemap_face_order[direction]; |
| ewi = ceilf(ew * (face + 1)) - ceilf(ew * face); |
| |
| uf = 0.5f * ewi * (uf + 1.f) - 0.5f; |
| vf = 0.5f * ehi * (vf + 1.f) - 0.5f; |
| |
| ui = floorf(uf); |
| vi = floorf(vf); |
| |
| *du = uf - ui; |
| *dv = vf - vi; |
| |
| for (int i = 0; i < 4; i++) { |
| for (int j = 0; j < 4; j++) { |
| int new_ui = ui + j - 1; |
| int new_vi = vi + i - 1; |
| int u_shift; |
| int new_ewi; |
| |
| if (new_ui >= 0 && new_ui < ewi && new_vi >= 0 && new_vi < ehi) { |
| face = s->in_cubemap_face_order[direction]; |
| |
| u_shift = ceilf(ew * face); |
| } else { |
| uf = 2.f * new_ui / ewi - 1.f; |
| vf = 2.f * new_vi / ehi - 1.f; |
| |
| uf /= scalew; |
| vf /= scaleh; |
| |
| process_cube_coordinates(s, uf, vf, direction, &uf, &vf, &face); |
| |
| uf *= scalew; |
| vf *= scaleh; |
| |
| u_shift = ceilf(ew * face); |
| new_ewi = ceilf(ew * (face + 1)) - u_shift; |
| |
| new_ui = av_clip(lrintf(0.5f * new_ewi * (uf + 1.f)), 0, new_ewi - 1); |
| new_vi = av_clip(lrintf(0.5f * ehi * (vf + 1.f)), 0, ehi - 1); |
| } |
| |
| us[i][j] = u_shift + new_ui; |
| vs[i][j] = new_vi; |
| } |
| } |
| |
| return 1; |
| } |
| |
| /** |
| * Calculate 3D coordinates on sphere for corresponding frame position in equirectangular format. |
| * |
| * @param s filter private context |
| * @param i horizontal position on frame [0, width) |
| * @param j vertical position on frame [0, height) |
| * @param width frame width |
| * @param height frame height |
| * @param vec coordinates on sphere |
| */ |
| static int equirect_to_xyz(const V360Context *s, |
| int i, int j, int width, int height, |
| float *vec) |
| { |
| const float phi = ((2.f * i + 0.5f) / width - 1.f) * M_PI; |
| const float theta = ((2.f * j + 0.5f) / height - 1.f) * M_PI_2; |
| |
| const float sin_phi = sinf(phi); |
| const float cos_phi = cosf(phi); |
| const float sin_theta = sinf(theta); |
| const float cos_theta = cosf(theta); |
| |
| vec[0] = cos_theta * sin_phi; |
| vec[1] = sin_theta; |
| vec[2] = cos_theta * cos_phi; |
| |
| return 1; |
| } |
| |
| /** |
| * Calculate 3D coordinates on sphere for corresponding frame position in half equirectangular format. |
| * |
| * @param s filter private context |
| * @param i horizontal position on frame [0, width) |
| * @param j vertical position on frame [0, height) |
| * @param width frame width |
| * @param height frame height |
| * @param vec coordinates on sphere |
| */ |
| static int hequirect_to_xyz(const V360Context *s, |
| int i, int j, int width, int height, |
| float *vec) |
| { |
| const float phi = ((2.f * i + 0.5f) / width - 1.f) * M_PI_2; |
| const float theta = ((2.f * j + 0.5f) / height - 1.f) * M_PI_2; |
| |
| const float sin_phi = sinf(phi); |
| const float cos_phi = cosf(phi); |
| const float sin_theta = sinf(theta); |
| const float cos_theta = cosf(theta); |
| |
| vec[0] = cos_theta * sin_phi; |
| vec[1] = sin_theta; |
| vec[2] = cos_theta * cos_phi; |
| |
| return 1; |
| } |
| |
| /** |
| * Prepare data for processing stereographic output format. |
| * |
| * @param ctx filter context |
| * |
| * @return error code |
| */ |
| static int prepare_stereographic_out(AVFilterContext *ctx) |
| { |
| V360Context *s = ctx->priv; |
| |
| s->flat_range[0] = tanf(FFMIN(s->h_fov, 359.f) * M_PI / 720.f); |
| s->flat_range[1] = tanf(FFMIN(s->v_fov, 359.f) * M_PI / 720.f); |
| |
| return 0; |
| } |
| |
| /** |
| * Calculate 3D coordinates on sphere for corresponding frame position in stereographic format. |
| * |
| * @param s filter private context |
| * @param i horizontal position on frame [0, width) |
| * @param j vertical position on frame [0, height) |
| * @param width frame width |
| * @param height frame height |
| * @param vec coordinates on sphere |
| */ |
| static int stereographic_to_xyz(const V360Context *s, |
| int i, int j, int width, int height, |
| float *vec) |
| { |
| const float x = ((2.f * i + 1.f) / width - 1.f) * s->flat_range[0]; |
| const float y = ((2.f * j + 1.f) / height - 1.f) * s->flat_range[1]; |
| const float r = hypotf(x, y); |
| const float theta = atanf(r) * 2.f; |
| const float sin_theta = sinf(theta); |
| |
| vec[0] = x / r * sin_theta; |
| vec[1] = y / r * sin_theta; |
| vec[2] = cosf(theta); |
| |
| normalize_vector(vec); |
| |
| return 1; |
| } |
| |
| /** |
| * Prepare data for processing stereographic input format. |
| * |
| * @param ctx filter context |
| * |
| * @return error code |
| */ |
| static int prepare_stereographic_in(AVFilterContext *ctx) |
| { |
| V360Context *s = ctx->priv; |
| |
| s->iflat_range[0] = tanf(FFMIN(s->ih_fov, 359.f) * M_PI / 720.f); |
| s->iflat_range[1] = tanf(FFMIN(s->iv_fov, 359.f) * M_PI / 720.f); |
| |
| return 0; |
| } |
| |
| /** |
| * Calculate frame position in stereographic format for corresponding 3D coordinates on sphere. |
| * |
| * @param s filter private context |
| * @param vec coordinates on sphere |
| * @param width frame width |
| * @param height frame height |
| * @param us horizontal coordinates for interpolation window |
| * @param vs vertical coordinates for interpolation window |
| * @param du horizontal relative coordinate |
| * @param dv vertical relative coordinate |
| */ |
| static int xyz_to_stereographic(const V360Context *s, |
| const float *vec, int width, int height, |
| int16_t us[4][4], int16_t vs[4][4], float *du, float *dv) |
| { |
| const float theta = acosf(vec[2]); |
| const float r = tanf(theta * 0.5f); |
| const float c = r / hypotf(vec[0], vec[1]); |
| const float x = vec[0] * c / s->iflat_range[0]; |
| const float y = vec[1] * c / s->iflat_range[1]; |
| |
| const float uf = (x + 1.f) * width / 2.f; |
| const float vf = (y + 1.f) * height / 2.f; |
| |
| const int ui = floorf(uf); |
| const int vi = floorf(vf); |
| |
| const int visible = isfinite(x) && isfinite(y) && vi >= 0 && vi < height && ui >= 0 && ui < width; |
| |
| *du = visible ? uf - ui : 0.f; |
| *dv = visible ? vf - vi : 0.f; |
| |
| for (int i = 0; i < 4; i++) { |
| for (int j = 0; j < 4; j++) { |
| us[i][j] = visible ? av_clip(ui + j - 1, 0, width - 1) : 0; |
| vs[i][j] = visible ? av_clip(vi + i - 1, 0, height - 1) : 0; |
| } |
| } |
| |
| return visible; |
| } |
| |
| /** |
| * Prepare data for processing equisolid output format. |
| * |
| * @param ctx filter context |
| * |
| * @return error code |
| */ |
| static int prepare_equisolid_out(AVFilterContext *ctx) |
| { |
| V360Context *s = ctx->priv; |
| |
| s->flat_range[0] = sinf(s->h_fov * M_PI / 720.f); |
| s->flat_range[1] = sinf(s->v_fov * M_PI / 720.f); |
| |
| return 0; |
| } |
| |
| /** |
| * Calculate 3D coordinates on sphere for corresponding frame position in equisolid format. |
| * |
| * @param s filter private context |
| * @param i horizontal position on frame [0, width) |
| * @param j vertical position on frame [0, height) |
| * @param width frame width |
| * @param height frame height |
| * @param vec coordinates on sphere |
| */ |
| static int equisolid_to_xyz(const V360Context *s, |
| int i, int j, int width, int height, |
| float *vec) |
| { |
| const float x = ((2.f * i + 1.f) / width - 1.f) * s->flat_range[0]; |
| const float y = ((2.f * j + 1.f) / height - 1.f) * s->flat_range[1]; |
| const float r = hypotf(x, y); |
| const float theta = asinf(r) * 2.f; |
| const float sin_theta = sinf(theta); |
| |
| vec[0] = x / r * sin_theta; |
| vec[1] = y / r * sin_theta; |
| vec[2] = cosf(theta); |
| |
| normalize_vector(vec); |
| |
| return 1; |
| } |
| |
| /** |
| * Prepare data for processing equisolid input format. |
| * |
| * @param ctx filter context |
| * |
| * @return error code |
| */ |
| static int prepare_equisolid_in(AVFilterContext *ctx) |
| { |
| V360Context *s = ctx->priv; |
| |
| s->iflat_range[0] = sinf(FFMIN(s->ih_fov, 359.f) * M_PI / 720.f); |
| s->iflat_range[1] = sinf(FFMIN(s->iv_fov, 359.f) * M_PI / 720.f); |
| |
| return 0; |
| } |
| |
| /** |
| * Calculate frame position in equisolid format for corresponding 3D coordinates on sphere. |
| * |
| * @param s filter private context |
| * @param vec coordinates on sphere |
| * @param width frame width |
| * @param height frame height |
| * @param us horizontal coordinates for interpolation window |
| * @param vs vertical coordinates for interpolation window |
| * @param du horizontal relative coordinate |
| * @param dv vertical relative coordinate |
| */ |
| static int xyz_to_equisolid(const V360Context *s, |
| const float *vec, int width, int height, |
| int16_t us[4][4], int16_t vs[4][4], float *du, float *dv) |
| { |
| const float theta = acosf(vec[2]); |
| const float r = sinf(theta * 0.5f); |
| const float c = r / hypotf(vec[0], vec[1]); |
| const float x = vec[0] * c / s->iflat_range[0]; |
| const float y = vec[1] * c / s->iflat_range[1]; |
| |
| const float uf = (x + 1.f) * width / 2.f; |
| const float vf = (y + 1.f) * height / 2.f; |
| |
| const int ui = floorf(uf); |
| const int vi = floorf(vf); |
| |
| const int visible = isfinite(x) && isfinite(y) && vi >= 0 && vi < height && ui >= 0 && ui < width; |
| |
| *du = visible ? uf - ui : 0.f; |
| *dv = visible ? vf - vi : 0.f; |
| |
| for (int i = 0; i < 4; i++) { |
| for (int j = 0; j < 4; j++) { |
| us[i][j] = visible ? av_clip(ui + j - 1, 0, width - 1) : 0; |
| vs[i][j] = visible ? av_clip(vi + i - 1, 0, height - 1) : 0; |
| } |
| } |
| |
| return visible; |
| } |
| |
| /** |
| * Prepare data for processing orthographic output format. |
| * |
| * @param ctx filter context |
| * |
| * @return error code |
| */ |
| static int prepare_orthographic_out(AVFilterContext *ctx) |
| { |
| V360Context *s = ctx->priv; |
| |
| s->flat_range[0] = sinf(FFMIN(s->h_fov, 180.f) * M_PI / 360.f); |
| s->flat_range[1] = sinf(FFMIN(s->v_fov, 180.f) * M_PI / 360.f); |
| |
| return 0; |
| } |
| |
| /** |
| * Calculate 3D coordinates on sphere for corresponding frame position in orthographic format. |
| * |
| * @param s filter private context |
| * @param i horizontal position on frame [0, width) |
| * @param j vertical position on frame [0, height) |
| * @param width frame width |
| * @param height frame height |
| * @param vec coordinates on sphere |
| */ |
| static int orthographic_to_xyz(const V360Context *s, |
| int i, int j, int width, int height, |
| float *vec) |
| { |
| const float x = ((2.f * i + 1.f) / width - 1.f) * s->flat_range[0]; |
| const float y = ((2.f * j + 1.f) / height - 1.f) * s->flat_range[1]; |
| const float r = hypotf(x, y); |
| const float theta = asinf(r); |
| |
| vec[0] = x; |
| vec[1] = y; |
| vec[2] = cosf(theta); |
| |
| normalize_vector(vec); |
| |
| return 1; |
| } |
| |
| /** |
| * Prepare data for processing orthographic input format. |
| * |
| * @param ctx filter context |
| * |
| * @return error code |
| */ |
| static int prepare_orthographic_in(AVFilterContext *ctx) |
| { |
| V360Context *s = ctx->priv; |
| |
| s->iflat_range[0] = sinf(FFMIN(s->ih_fov, 180.f) * M_PI / 360.f); |
| s->iflat_range[1] = sinf(FFMIN(s->iv_fov, 180.f) * M_PI / 360.f); |
| |
| return 0; |
| } |
| |
| /** |
| * Calculate frame position in orthographic format for corresponding 3D coordinates on sphere. |
| * |
| * @param s filter private context |
| * @param vec coordinates on sphere |
| * @param width frame width |
| * @param height frame height |
| * @param us horizontal coordinates for interpolation window |
| * @param vs vertical coordinates for interpolation window |
| * @param du horizontal relative coordinate |
| * @param dv vertical relative coordinate |
| */ |
| static int xyz_to_orthographic(const V360Context *s, |
| const float *vec, int width, int height, |
| int16_t us[4][4], int16_t vs[4][4], float *du, float *dv) |
| { |
| const float theta = acosf(vec[2]); |
| const float r = sinf(theta); |
| const float c = r / hypotf(vec[0], vec[1]); |
| const float x = vec[0] * c / s->iflat_range[0]; |
| const float y = vec[1] * c / s->iflat_range[1]; |
| |
| const float uf = (x + 1.f) * width / 2.f; |
| const float vf = (y + 1.f) * height / 2.f; |
| |
| const int ui = floorf(uf); |
| const int vi = floorf(vf); |
| |
| const int visible = vec[2] >= 0.f && isfinite(x) && isfinite(y) && vi >= 0 && vi < height && ui >= 0 && ui < width; |
| |
| *du = visible ? uf - ui : 0.f; |
| *dv = visible ? vf - vi : 0.f; |
| |
| for (int i = 0; i < 4; i++) { |
| for (int j = 0; j < 4; j++) { |
| us[i][j] = visible ? av_clip(ui + j - 1, 0, width - 1) : 0; |
| vs[i][j] = visible ? av_clip(vi + i - 1, 0, height - 1) : 0; |
| } |
| } |
| |
| return visible; |
| } |
| |
| /** |
| * Calculate frame position in equirectangular format for corresponding 3D coordinates on sphere. |
| * |
| * @param s filter private context |
| * @param vec coordinates on sphere |
| * @param width frame width |
| * @param height frame height |
| * @param us horizontal coordinates for interpolation window |
| * @param vs vertical coordinates for interpolation window |
| * @param du horizontal relative coordinate |
| * @param dv vertical relative coordinate |
| */ |
| static int xyz_to_equirect(const V360Context *s, |
| const float *vec, int width, int height, |
| int16_t us[4][4], int16_t vs[4][4], float *du, float *dv) |
| { |
| const float phi = atan2f(vec[0], vec[2]); |
| const float theta = asinf(vec[1]); |
| |
| const float uf = (phi / M_PI + 1.f) * width / 2.f; |
| const float vf = (theta / M_PI_2 + 1.f) * height / 2.f; |
| |
| const int ui = floorf(uf); |
| const int vi = floorf(vf); |
| |
| *du = uf - ui; |
| *dv = vf - vi; |
| |
| for (int i = 0; i < 4; i++) { |
| for (int j = 0; j < 4; j++) { |
| us[i][j] = ereflectx(ui + j - 1, vi + i - 1, width, height); |
| vs[i][j] = reflecty(vi + i - 1, height); |
| } |
| } |
| |
| return 1; |
| } |
| |
| /** |
| * Calculate frame position in half equirectangular format for corresponding 3D coordinates on sphere. |
| * |
| * @param s filter private context |
| * @param vec coordinates on sphere |
| * @param width frame width |
| * @param height frame height |
| * @param us horizontal coordinates for interpolation window |
| * @param vs vertical coordinates for interpolation window |
| * @param du horizontal relative coordinate |
| * @param dv vertical relative coordinate |
| */ |
| static int xyz_to_hequirect(const V360Context *s, |
| const float *vec, int width, int height, |
| int16_t us[4][4], int16_t vs[4][4], float *du, float *dv) |
| { |
| const float phi = atan2f(vec[0], vec[2]); |
| const float theta = asinf(vec[1]); |
| |
| const float uf = (phi / M_PI_2 + 1.f) * width / 2.f; |
| const float vf = (theta / M_PI_2 + 1.f) * height / 2.f; |
| |
| const int ui = floorf(uf); |
| const int vi = floorf(vf); |
| |
| const int visible = phi >= -M_PI_2 && phi <= M_PI_2; |
| |
| *du = uf - ui; |
| *dv = vf - vi; |
| |
| for (int i = 0; i < 4; i++) { |
| for (int j = 0; j < 4; j++) { |
| us[i][j] = av_clip(ui + j - 1, 0, width - 1); |
| vs[i][j] = av_clip(vi + i - 1, 0, height - 1); |
| } |
| } |
| |
| return visible; |
| } |
| |
| /** |
| * Prepare data for processing flat input format. |
| * |
| * @param ctx filter context |
| * |
| * @return error code |
| */ |
| static int prepare_flat_in(AVFilterContext *ctx) |
| { |
| V360Context *s = ctx->priv; |
| |
| s->iflat_range[0] = tanf(0.5f * s->ih_fov * M_PI / 180.f); |
| s->iflat_range[1] = tanf(0.5f * s->iv_fov * M_PI / 180.f); |
| |
| return 0; |
| } |
| |
| /** |
| * Calculate frame position in flat format for corresponding 3D coordinates on sphere. |
| * |
| * @param s filter private context |
| * @param vec coordinates on sphere |
| * @param width frame width |
| * @param height frame height |
| * @param us horizontal coordinates for interpolation window |
| * @param vs vertical coordinates for interpolation window |
| * @param du horizontal relative coordinate |
| * @param dv vertical relative coordinate |
| */ |
| static int xyz_to_flat(const V360Context *s, |
| const float *vec, int width, int height, |
| int16_t us[4][4], int16_t vs[4][4], float *du, float *dv) |
| { |
| const float theta = acosf(vec[2]); |
| const float r = tanf(theta); |
| const float rr = fabsf(r) < 1e+6f ? r : hypotf(width, height); |
| const float zf = vec[2]; |
| const float h = hypotf(vec[0], vec[1]); |
| const float c = h <= 1e-6f ? 1.f : rr / h; |
| float uf = vec[0] * c / s->iflat_range[0]; |
| float vf = vec[1] * c / s->iflat_range[1]; |
| int visible, ui, vi; |
| |
| uf = zf >= 0.f ? (uf + 1.f) * width / 2.f : 0.f; |
| vf = zf >= 0.f ? (vf + 1.f) * height / 2.f : 0.f; |
| |
| ui = floorf(uf); |
| vi = floorf(vf); |
| |
| visible = vi >= 0 && vi < height && ui >= 0 && ui < width && zf >= 0.f; |
| |
| *du = uf - ui; |
| *dv = vf - vi; |
| |
| for (int i = 0; i < 4; i++) { |
| for (int j = 0; j < 4; j++) { |
| us[i][j] = visible ? av_clip(ui + j - 1, 0, width - 1) : 0; |
| vs[i][j] = visible ? av_clip(vi + i - 1, 0, height - 1) : 0; |
| } |
| } |
| |
| return visible; |
| } |
| |
| /** |
| * Calculate frame position in mercator format for corresponding 3D coordinates on sphere. |
| * |
| * @param s filter private context |
| * @param vec coordinates on sphere |
| * @param width frame width |
| * @param height frame height |
| * @param us horizontal coordinates for interpolation window |
| * @param vs vertical coordinates for interpolation window |
| * @param du horizontal relative coordinate |
| * @param dv vertical relative coordinate |
| */ |
| static int xyz_to_mercator(const V360Context *s, |
| const float *vec, int width, int height, |
| int16_t us[4][4], int16_t vs[4][4], float *du, float *dv) |
| { |
| const float phi = atan2f(vec[0], vec[2]); |
| const float theta = vec[1]; |
| |
| const float uf = (phi / M_PI + 1.f) * width / 2.f; |
| const float vf = (av_clipf(logf((1.f + theta) / (1.f - theta)) / (2.f * M_PI), -1.f, 1.f) + 1.f) * height / 2.f; |
| |
| const int ui = floorf(uf); |
| const int vi = floorf(vf); |
| |
| *du = uf - ui; |
| *dv = vf - vi; |
| |
| for (int i = 0; i < 4; i++) { |
| for (int j = 0; j < 4; j++) { |
| us[i][j] = av_clip(ui + j - 1, 0, width - 1); |
| vs[i][j] = av_clip(vi + i - 1, 0, height - 1); |
| } |
| } |
| |
| return 1; |
| } |
| |
| /** |
| * Calculate 3D coordinates on sphere for corresponding frame position in mercator format. |
| * |
| * @param s filter private context |
| * @param i horizontal position on frame [0, width) |
| * @param j vertical position on frame [0, height) |
| * @param width frame width |
| * @param height frame height |
| * @param vec coordinates on sphere |
| */ |
| static int mercator_to_xyz(const V360Context *s, |
| int i, int j, int width, int height, |
| float *vec) |
| { |
| const float phi = ((2.f * i + 1.f) / width - 1.f) * M_PI + M_PI_2; |
| const float y = ((2.f * j + 1.f) / height - 1.f) * M_PI; |
| const float div = expf(2.f * y) + 1.f; |
| |
| const float sin_phi = sinf(phi); |
| const float cos_phi = cosf(phi); |
| const float sin_theta = 2.f * expf(y) / div; |
| const float cos_theta = (expf(2.f * y) - 1.f) / div; |
| |
| vec[0] = -sin_theta * cos_phi; |
| vec[1] = cos_theta; |
| vec[2] = sin_theta * sin_phi; |
| |
| return 1; |
| } |
| |
| /** |
| * Calculate frame position in ball format for corresponding 3D coordinates on sphere. |
| * |
| * @param s filter private context |
| * @param vec coordinates on sphere |
| * @param width frame width |
| * @param height frame height |
| * @param us horizontal coordinates for interpolation window |
| * @param vs vertical coordinates for interpolation window |
| * @param du horizontal relative coordinate |
| * @param dv vertical relative coordinate |
| */ |
| static int xyz_to_ball(const V360Context *s, |
| const float *vec, int width, int height, |
| int16_t us[4][4], int16_t vs[4][4], float *du, float *dv) |
| { |
| const float l = hypotf(vec[0], vec[1]); |
| const float r = sqrtf(1.f - vec[2]) / M_SQRT2; |
| |
| const float uf = (1.f + r * vec[0] / (l > 0.f ? l : 1.f)) * width * 0.5f; |
| const float vf = (1.f + r * vec[1] / (l > 0.f ? l : 1.f)) * height * 0.5f; |
| |
| const int ui = floorf(uf); |
| const int vi = floorf(vf); |
| |
| *du = uf - ui; |
| *dv = vf - vi; |
| |
| for (int i = 0; i < 4; i++) { |
| for (int j = 0; j < 4; j++) { |
| us[i][j] = av_clip(ui + j - 1, 0, width - 1); |
| vs[i][j] = av_clip(vi + i - 1, 0, height - 1); |
| } |
| } |
| |
| return 1; |
| } |
| |
| /** |
| * Calculate 3D coordinates on sphere for corresponding frame position in ball format. |
| * |
| * @param s filter private context |
| * @param i horizontal position on frame [0, width) |
| * @param j vertical position on frame [0, height) |
| * @param width frame width |
| * @param height frame height |
| * @param vec coordinates on sphere |
| */ |
| static int ball_to_xyz(const V360Context *s, |
| int i, int j, int width, int height, |
| float *vec) |
| { |
| const float x = (2.f * i + 1.f) / width - 1.f; |
| const float y = (2.f * j + 1.f) / height - 1.f; |
| const float l = hypotf(x, y); |
| |
| if (l <= 1.f) { |
| const float z = 2.f * l * sqrtf(1.f - l * l); |
| |
| vec[0] = z * x / (l > 0.f ? l : 1.f); |
| vec[1] = z * y / (l > 0.f ? l : 1.f); |
| vec[2] = 1.f - 2.f * l * l; |
| } else { |
| vec[0] = 0.f; |
| vec[1] = 1.f; |
| vec[2] = 0.f; |
| return 0; |
| } |
| |
| return 1; |
| } |
| |
| /** |
| * Calculate 3D coordinates on sphere for corresponding frame position in hammer format. |
| * |
| * @param s filter private context |
| * @param i horizontal position on frame [0, width) |
| * @param j vertical position on frame [0, height) |
| * @param width frame width |
| * @param height frame height |
| * @param vec coordinates on sphere |
| */ |
| static int hammer_to_xyz(const V360Context *s, |
| int i, int j, int width, int height, |
| float *vec) |
| { |
| const float x = ((2.f * i + 1.f) / width - 1.f); |
| const float y = ((2.f * j + 1.f) / height - 1.f); |
| |
| const float xx = x * x; |
| const float yy = y * y; |
| |
| const float z = sqrtf(1.f - xx * 0.5f - yy * 0.5f); |
| |
| const float a = M_SQRT2 * x * z; |
| const float b = 2.f * z * z - 1.f; |
| |
| const float aa = a * a; |
| const float bb = b * b; |
| |
| const float w = sqrtf(1.f - 2.f * yy * z * z); |
| |
| vec[0] = w * 2.f * a * b / (aa + bb); |
| vec[1] = M_SQRT2 * y * z; |
| vec[2] = w * (bb - aa) / (aa + bb); |
| |
| normalize_vector(vec); |
| |
| return 1; |
| } |
| |
| /** |
| * Calculate frame position in hammer format for corresponding 3D coordinates on sphere. |
| * |
| * @param s filter private context |
| * @param vec coordinates on sphere |
| * @param width frame width |
| * @param height frame height |
| * @param us horizontal coordinates for interpolation window |
| * @param vs vertical coordinates for interpolation window |
| * @param du horizontal relative coordinate |
| * @param dv vertical relative coordinate |
| */ |
| static int xyz_to_hammer(const V360Context *s, |
| const float *vec, int width, int height, |
| int16_t us[4][4], int16_t vs[4][4], float *du, float *dv) |
| { |
| const float theta = atan2f(vec[0], vec[2]); |
| |
| const float z = sqrtf(1.f + sqrtf(1.f - vec[1] * vec[1]) * cosf(theta * 0.5f)); |
| const float x = sqrtf(1.f - vec[1] * vec[1]) * sinf(theta * 0.5f) / z; |
| const float y = vec[1] / z; |
| |
| const float uf = (x + 1.f) * width / 2.f; |
| const float vf = (y + 1.f) * height / 2.f; |
| |
| const int ui = floorf(uf); |
| const int vi = floorf(vf); |
| |
| *du = uf - ui; |
| *dv = vf - vi; |
| |
| for (int i = 0; i < 4; i++) { |
| for (int j = 0; j < 4; j++) { |
| us[i][j] = av_clip(ui + j - 1, 0, width - 1); |
| vs[i][j] = av_clip(vi + i - 1, 0, height - 1); |
| } |
| } |
| |
| return 1; |
| } |
| |
| /** |
| * Calculate 3D coordinates on sphere for corresponding frame position in sinusoidal format. |
| * |
| * @param s filter private context |
| * @param i horizontal position on frame [0, width) |
| * @param j vertical position on frame [0, height) |
| * @param width frame width |
| * @param height frame height |
| * @param vec coordinates on sphere |
| */ |
| static int sinusoidal_to_xyz(const V360Context *s, |
| int i, int j, int width, int height, |
| float *vec) |
| { |
| const float theta = ((2.f * j + 1.f) / height - 1.f) * M_PI_2; |
| const float phi = ((2.f * i + 1.f) / width - 1.f) * M_PI / cosf(theta); |
| |
| const float sin_phi = sinf(phi); |
| const float cos_phi = cosf(phi); |
| const float sin_theta = sinf(theta); |
| const float cos_theta = cosf(theta); |
| |
| vec[0] = cos_theta * sin_phi; |
| vec[1] = sin_theta; |
| vec[2] = cos_theta * cos_phi; |
| |
| normalize_vector(vec); |
| |
| return 1; |
| } |
| |
| /** |
| * Calculate frame position in sinusoidal format for corresponding 3D coordinates on sphere. |
| * |
| * @param s filter private context |
| * @param vec coordinates on sphere |
| * @param width frame width |
| * @param height frame height |
| * @param us horizontal coordinates for interpolation window |
| * @param vs vertical coordinates for interpolation window |
| * @param du horizontal relative coordinate |
| * @param dv vertical relative coordinate |
| */ |
| static int xyz_to_sinusoidal(const V360Context *s, |
| const float *vec, int width, int height, |
| int16_t us[4][4], int16_t vs[4][4], float *du, float *dv) |
| { |
| const float theta = asinf(vec[1]); |
| const float phi = atan2f(vec[0], vec[2]) * cosf(theta); |
| |
| const float uf = (phi / M_PI + 1.f) * width / 2.f; |
| const float vf = (theta / M_PI_2 + 1.f) * height / 2.f; |
| |
| const int ui = floorf(uf); |
| const int vi = floorf(vf); |
| |
| *du = uf - ui; |
| *dv = vf - vi; |
| |
| for (int i = 0; i < 4; i++) { |
| for (int j = 0; j < 4; j++) { |
| us[i][j] = av_clip(ui + j - 1, 0, width - 1); |
| vs[i][j] = av_clip(vi + i - 1, 0, height - 1); |
| } |
| } |
| |
| return 1; |
| } |
|