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FFmpeg/libavfilter/vf_v360.c

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  1. /*

  2.  * Copyright (c) 2019 Eugene Lyapustin

  3.  *

  4.  * This file is part of FFmpeg.

  5.  *

  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.

  10.  *

  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.

  15.  *

  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

  19.  */

  20. 

  21. /**

  22.  * @file

  23.  * 360 video conversion filter.

  24.  * Principle of operation:

  25.  *

  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

  31.  *

  32.  * (for each frame)

  33.  * 5) Remap input frame to output frame using precalculated data

  34.  */

  35. 

  36. #include <math.h>

  37. 

  38. #include "libavutil/avassert.h"

  39. #include "libavutil/imgutils.h"

  40. #include "libavutil/pixdesc.h"

  41. #include "libavutil/opt.h"

  42. #include "avfilter.h"

  43. #include "formats.h"

  44. #include "internal.h"

  45. #include "video.h"

  46. #include "v360.h"

  47. 

  48. typedef struct ThreadData {

  49.     AVFrame *in;

  50.     AVFrame *out;

  51. } ThreadData;

  52. 

  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

  56. 

  57. static const AVOption v360_options[] = {

  58.     {     "input", "set input projection",              OFFSET(in), AV_OPT_TYPE_INT,    {.i64=EQUIRECTANGULAR}, 0,    NB_PROJECTIONS-1, FLAGS, "in" },

  59.     {         "e", "equirectangular",                            0, AV_OPT_TYPE_CONST,  {.i64=EQUIRECTANGULAR}, 0,                   0, FLAGS, "in" },

  60.     {  "equirect", "equirectangular",                            0, AV_OPT_TYPE_CONST,  {.i64=EQUIRECTANGULAR}, 0,                   0, FLAGS, "in" },

  61.     {      "c3x2", "cubemap 3x2",                                0, AV_OPT_TYPE_CONST,  {.i64=CUBEMAP_3_2},     0,                   0, FLAGS, "in" },

  62.     {      "c6x1", "cubemap 6x1",                                0, AV_OPT_TYPE_CONST,  {.i64=CUBEMAP_6_1},     0,                   0, FLAGS, "in" },

  63.     {       "eac", "equi-angular cubemap",                       0, AV_OPT_TYPE_CONST,  {.i64=EQUIANGULAR},     0,                   0, FLAGS, "in" },

  64.     {  "dfisheye", "dual fisheye",                               0, AV_OPT_TYPE_CONST,  {.i64=DUAL_FISHEYE},    0,                   0, FLAGS, "in" },

  65.     {      "flat", "regular video",                              0, AV_OPT_TYPE_CONST,  {.i64=FLAT},            0,                   0, FLAGS, "in" },

  66.     {"rectilinear", "regular video",                             0, AV_OPT_TYPE_CONST,  {.i64=FLAT},            0,                   0, FLAGS, "in" },

  67.     {  "gnomonic", "regular video",                              0, AV_OPT_TYPE_CONST,  {.i64=FLAT},            0,                   0, FLAGS, "in" },

  68.     {    "barrel", "barrel facebook's 360 format",               0, AV_OPT_TYPE_CONST,  {.i64=BARREL},          0,                   0, FLAGS, "in" },

  69.     {        "fb", "barrel facebook's 360 format",               0, AV_OPT_TYPE_CONST,  {.i64=BARREL},          0,                   0, FLAGS, "in" },

  70.     {      "c1x6", "cubemap 1x6",                                0, AV_OPT_TYPE_CONST,  {.i64=CUBEMAP_1_6},     0,                   0, FLAGS, "in" },

  71.     {        "sg", "stereographic",                              0, AV_OPT_TYPE_CONST,  {.i64=STEREOGRAPHIC},   0,                   0, FLAGS, "in" },

  72.     {  "mercator", "mercator",                                   0, AV_OPT_TYPE_CONST,  {.i64=MERCATOR},        0,                   0, FLAGS, "in" },

  73.     {      "ball", "ball",                                       0, AV_OPT_TYPE_CONST,  {.i64=BALL},            0,                   0, FLAGS, "in" },

  74.     {    "hammer", "hammer",                                     0, AV_OPT_TYPE_CONST,  {.i64=HAMMER},          0,                   0, FLAGS, "in" },

  75.     {"sinusoidal", "sinusoidal",                                 0, AV_OPT_TYPE_CONST,  {.i64=SINUSOIDAL},      0,                   0, FLAGS, "in" },

  76.     {   "fisheye", "fisheye",                                    0, AV_OPT_TYPE_CONST,  {.i64=FISHEYE},         0,                   0, FLAGS, "in" },

  77.     {   "pannini", "pannini",                                    0, AV_OPT_TYPE_CONST,  {.i64=PANNINI},         0,                   0, FLAGS, "in" },

  78.     {"cylindrical", "cylindrical",                               0, AV_OPT_TYPE_CONST,  {.i64=CYLINDRICAL},     0,                   0, FLAGS, "in" },

  79.     {"tetrahedron", "tetrahedron",                               0, AV_OPT_TYPE_CONST,  {.i64=TETRAHEDRON},     0,                   0, FLAGS, "in" },

  80.     {"barrelsplit", "barrel split facebook's 360 format",        0, AV_OPT_TYPE_CONST,  {.i64=BARREL_SPLIT},    0,                   0, FLAGS, "in" },

  81.     {       "tsp", "truncated square pyramid",                   0, AV_OPT_TYPE_CONST,  {.i64=TSPYRAMID},       0,                   0, FLAGS, "in" },

  82.     { "hequirect", "half equirectangular",                       0, AV_OPT_TYPE_CONST,  {.i64=HEQUIRECTANGULAR},0,                   0, FLAGS, "in" },

  83.     {        "he", "half equirectangular",                       0, AV_OPT_TYPE_CONST,  {.i64=HEQUIRECTANGULAR},0,                   0, FLAGS, "in" },

  84.     { "equisolid", "equisolid",                                  0, AV_OPT_TYPE_CONST,  {.i64=EQUISOLID},       0,                   0, FLAGS, "in" },

  85.     {        "og", "orthographic",                               0, AV_OPT_TYPE_CONST,  {.i64=ORTHOGRAPHIC},    0,                   0, FLAGS, "in" },

  86.     {    "output", "set output projection",            OFFSET(out), AV_OPT_TYPE_INT,    {.i64=CUBEMAP_3_2},     0,    NB_PROJECTIONS-1, FLAGS, "out" },

  87.     {         "e", "equirectangular",                            0, AV_OPT_TYPE_CONST,  {.i64=EQUIRECTANGULAR}, 0,                   0, FLAGS, "out" },

  88.     {  "equirect", "equirectangular",                            0, AV_OPT_TYPE_CONST,  {.i64=EQUIRECTANGULAR}, 0,                   0, FLAGS, "out" },

  89.     {      "c3x2", "cubemap 3x2",                                0, AV_OPT_TYPE_CONST,  {.i64=CUBEMAP_3_2},     0,                   0, FLAGS, "out" },

  90.     {      "c6x1", "cubemap 6x1",                                0, AV_OPT_TYPE_CONST,  {.i64=CUBEMAP_6_1},     0,                   0, FLAGS, "out" },

  91.     {       "eac", "equi-angular cubemap",                       0, AV_OPT_TYPE_CONST,  {.i64=EQUIANGULAR},     0,                   0, FLAGS, "out" },

  92.     {  "dfisheye", "dual fisheye",                               0, AV_OPT_TYPE_CONST,  {.i64=DUAL_FISHEYE},    0,                   0, FLAGS, "out" },

  93.     {      "flat", "regular video",                              0, AV_OPT_TYPE_CONST,  {.i64=FLAT},            0,                   0, FLAGS, "out" },

  94.     {"rectilinear", "regular video",                             0, AV_OPT_TYPE_CONST,  {.i64=FLAT},            0,                   0, FLAGS, "out" },

  95.     {  "gnomonic", "regular video",                              0, AV_OPT_TYPE_CONST,  {.i64=FLAT},            0,                   0, FLAGS, "out" },

  96.     {    "barrel", "barrel facebook's 360 format",               0, AV_OPT_TYPE_CONST,  {.i64=BARREL},          0,                   0, FLAGS, "out" },

  97.     {        "fb", "barrel facebook's 360 format",               0, AV_OPT_TYPE_CONST,  {.i64=BARREL},          0,                   0, FLAGS, "out" },

  98.     {      "c1x6", "cubemap 1x6",                                0, AV_OPT_TYPE_CONST,  {.i64=CUBEMAP_1_6},     0,                   0, FLAGS, "out" },

  99.     {        "sg", "stereographic",                              0, AV_OPT_TYPE_CONST,  {.i64=STEREOGRAPHIC},   0,                   0, FLAGS, "out" },

  100.     {  "mercator", "mercator",                                   0, AV_OPT_TYPE_CONST,  {.i64=MERCATOR},        0,                   0, FLAGS, "out" },

  101.     {      "ball", "ball",                                       0, AV_OPT_TYPE_CONST,  {.i64=BALL},            0,                   0, FLAGS, "out" },

  102.     {    "hammer", "hammer",                                     0, AV_OPT_TYPE_CONST,  {.i64=HAMMER},          0,                   0, FLAGS, "out" },

  103.     {"sinusoidal", "sinusoidal",                                 0, AV_OPT_TYPE_CONST,  {.i64=SINUSOIDAL},      0,                   0, FLAGS, "out" },

  104.     {   "fisheye", "fisheye",                                    0, AV_OPT_TYPE_CONST,  {.i64=FISHEYE},         0,                   0, FLAGS, "out" },

  105.     {   "pannini", "pannini",                                    0, AV_OPT_TYPE_CONST,  {.i64=PANNINI},         0,                   0, FLAGS, "out" },

  106.     {"cylindrical", "cylindrical",                               0, AV_OPT_TYPE_CONST,  {.i64=CYLINDRICAL},     0,                   0, FLAGS, "out" },

  107.     {"perspective", "perspective",                               0, AV_OPT_TYPE_CONST,  {.i64=PERSPECTIVE},     0,                   0, FLAGS, "out" },

  108.     {"tetrahedron", "tetrahedron",                               0, AV_OPT_TYPE_CONST,  {.i64=TETRAHEDRON},     0,                   0, FLAGS, "out" },

  109.     {"barrelsplit", "barrel split facebook's 360 format",        0, AV_OPT_TYPE_CONST,  {.i64=BARREL_SPLIT},    0,                   0, FLAGS, "out" },

  110.     {       "tsp", "truncated square pyramid",                   0, AV_OPT_TYPE_CONST,  {.i64=TSPYRAMID},       0,                   0, FLAGS, "out" },

  111.     { "hequirect", "half equirectangular",                       0, AV_OPT_TYPE_CONST,  {.i64=HEQUIRECTANGULAR},0,                   0, FLAGS, "out" },

  112.     {        "he", "half equirectangular",                       0, AV_OPT_TYPE_CONST,  {.i64=HEQUIRECTANGULAR},0,                   0, FLAGS, "out" },

  113.     { "equisolid", "equisolid",                                  0, AV_OPT_TYPE_CONST,  {.i64=EQUISOLID},       0,                   0, FLAGS, "out" },

  114.     {        "og", "orthographic",                               0, AV_OPT_TYPE_CONST,  {.i64=ORTHOGRAPHIC},    0,                   0, FLAGS, "out" },

  115.     {    "interp", "set interpolation method",      OFFSET(interp), AV_OPT_TYPE_INT,    {.i64=BILINEAR},        0, NB_INTERP_METHODS-1, FLAGS, "interp" },

  116.     {      "near", "nearest neighbour",                          0, AV_OPT_TYPE_CONST,  {.i64=NEAREST},         0,                   0, FLAGS, "interp" },

  117.     {   "nearest", "nearest neighbour",                          0, AV_OPT_TYPE_CONST,  {.i64=NEAREST},         0,                   0, FLAGS, "interp" },

  118.     {      "line", "bilinear interpolation",                     0, AV_OPT_TYPE_CONST,  {.i64=BILINEAR},        0,                   0, FLAGS, "interp" },

  119.     {    "linear", "bilinear interpolation",                     0, AV_OPT_TYPE_CONST,  {.i64=BILINEAR},        0,                   0, FLAGS, "interp" },

  120.     { "lagrange9", "lagrange9 interpolation",                    0, AV_OPT_TYPE_CONST,  {.i64=LAGRANGE9},       0,                   0, FLAGS, "interp" },

  121.     {      "cube", "bicubic interpolation",                      0, AV_OPT_TYPE_CONST,  {.i64=BICUBIC},         0,                   0, FLAGS, "interp" },

  122.     {     "cubic", "bicubic interpolation",                      0, AV_OPT_TYPE_CONST,  {.i64=BICUBIC},         0,                   0, FLAGS, "interp" },

  123.     {      "lanc", "lanczos interpolation",                      0, AV_OPT_TYPE_CONST,  {.i64=LANCZOS},         0,                   0, FLAGS, "interp" },

  124.     {   "lanczos", "lanczos interpolation",                      0, AV_OPT_TYPE_CONST,  {.i64=LANCZOS},         0,                   0, FLAGS, "interp" },

  125.     {      "sp16", "spline16 interpolation",                     0, AV_OPT_TYPE_CONST,  {.i64=SPLINE16},        0,                   0, FLAGS, "interp" },

  126.     {  "spline16", "spline16 interpolation",                     0, AV_OPT_TYPE_CONST,  {.i64=SPLINE16},        0,                   0, FLAGS, "interp" },

  127.     {     "gauss", "gaussian interpolation",                     0, AV_OPT_TYPE_CONST,  {.i64=GAUSSIAN},        0,                   0, FLAGS, "interp" },

  128.     {  "gaussian", "gaussian interpolation",                     0, AV_OPT_TYPE_CONST,  {.i64=GAUSSIAN},        0,                   0, FLAGS, "interp" },

  129.     {         "w", "output width",                   OFFSET(width), AV_OPT_TYPE_INT,    {.i64=0},               0,           INT16_MAX, FLAGS, "w"},

  130.     {         "h", "output height",                 OFFSET(height), AV_OPT_TYPE_INT,    {.i64=0},               0,           INT16_MAX, FLAGS, "h"},

  131.     { "in_stereo", "input stereo format",        OFFSET(in_stereo), AV_OPT_TYPE_INT,    {.i64=STEREO_2D},       0,    NB_STEREO_FMTS-1, FLAGS, "stereo" },

  132.     {"out_stereo", "output stereo format",      OFFSET(out_stereo), AV_OPT_TYPE_INT,    {.i64=STEREO_2D},       0,    NB_STEREO_FMTS-1, FLAGS, "stereo" },

  133.     {        "2d", "2d mono",                                    0, AV_OPT_TYPE_CONST,  {.i64=STEREO_2D},       0,                   0, FLAGS, "stereo" },

  134.     {       "sbs", "side by side",                               0, AV_OPT_TYPE_CONST,  {.i64=STEREO_SBS},      0,                   0, FLAGS, "stereo" },

  135.     {        "tb", "top bottom",                                 0, AV_OPT_TYPE_CONST,  {.i64=STEREO_TB},       0,                   0, FLAGS, "stereo" },

  136.     { "in_forder", "input cubemap face order",   OFFSET(in_forder), AV_OPT_TYPE_STRING, {.str="rludfb"},        0,     NB_DIRECTIONS-1, FLAGS, "in_forder"},

  137.     {"out_forder", "output cubemap face order", OFFSET(out_forder), AV_OPT_TYPE_STRING, {.str="rludfb"},        0,     NB_DIRECTIONS-1, FLAGS, "out_forder"},

  138.     {   "in_frot", "input cubemap face rotation",  OFFSET(in_frot), AV_OPT_TYPE_STRING, {.str="000000"},        0,     NB_DIRECTIONS-1, FLAGS, "in_frot"},

  139.     {  "out_frot", "output cubemap face rotation",OFFSET(out_frot), AV_OPT_TYPE_STRING, {.str="000000"},        0,     NB_DIRECTIONS-1, FLAGS, "out_frot"},

  140.     {    "in_pad", "percent input cubemap pads",    OFFSET(in_pad), AV_OPT_TYPE_FLOAT,  {.dbl=0.f},           0.f,                 0.1,TFLAGS, "in_pad"},

  141.     {   "out_pad", "percent output cubemap pads",  OFFSET(out_pad), AV_OPT_TYPE_FLOAT,  {.dbl=0.f},           0.f,                 0.1,TFLAGS, "out_pad"},

  142.     {   "fin_pad", "fixed input cubemap pads",     OFFSET(fin_pad), AV_OPT_TYPE_INT,    {.i64=0},               0,                 100,TFLAGS, "fin_pad"},

  143.     {  "fout_pad", "fixed output cubemap pads",   OFFSET(fout_pad), AV_OPT_TYPE_INT,    {.i64=0},               0,                 100,TFLAGS, "fout_pad"},

  144.     {       "yaw", "yaw rotation",                     OFFSET(yaw), AV_OPT_TYPE_FLOAT,  {.dbl=0.f},        -180.f,               180.f,TFLAGS, "yaw"},

  145.     {     "pitch", "pitch rotation",                 OFFSET(pitch), AV_OPT_TYPE_FLOAT,  {.dbl=0.f},        -180.f,               180.f,TFLAGS, "pitch"},

  146.     {      "roll", "roll rotation",                   OFFSET(roll), AV_OPT_TYPE_FLOAT,  {.dbl=0.f},        -180.f,               180.f,TFLAGS, "roll"},

  147.     {    "rorder", "rotation order",                OFFSET(rorder), AV_OPT_TYPE_STRING, {.str="ypr"},           0,                   0,TFLAGS, "rorder"},

  148.     {     "h_fov", "output horizontal field of view",OFFSET(h_fov), AV_OPT_TYPE_FLOAT,  {.dbl=90.f},     0.00001f,               360.f,TFLAGS, "h_fov"},

  149.     {     "v_fov", "output vertical field of view",  OFFSET(v_fov), AV_OPT_TYPE_FLOAT,  {.dbl=45.f},     0.00001f,               360.f,TFLAGS, "v_fov"},

  150.     {     "d_fov", "output diagonal field of view",  OFFSET(d_fov), AV_OPT_TYPE_FLOAT,  {.dbl=0.f},           0.f,               360.f,TFLAGS, "d_fov"},

  151.     {    "h_flip", "flip out video horizontally",   OFFSET(h_flip), AV_OPT_TYPE_BOOL,   {.i64=0},               0,                   1,TFLAGS, "h_flip"},

  152.     {    "v_flip", "flip out video vertically",     OFFSET(v_flip), AV_OPT_TYPE_BOOL,   {.i64=0},               0,                   1,TFLAGS, "v_flip"},

  153.     {    "d_flip", "flip out video indepth",        OFFSET(d_flip), AV_OPT_TYPE_BOOL,   {.i64=0},               0,                   1,TFLAGS, "d_flip"},

  154.     {   "ih_flip", "flip in video horizontally",   OFFSET(ih_flip), AV_OPT_TYPE_BOOL,   {.i64=0},               0,                   1,TFLAGS, "ih_flip"},

  155.     {   "iv_flip", "flip in video vertically",     OFFSET(iv_flip), AV_OPT_TYPE_BOOL,   {.i64=0},               0,                   1,TFLAGS, "iv_flip"},

  156.     {  "in_trans", "transpose video input",   OFFSET(in_transpose), AV_OPT_TYPE_BOOL,   {.i64=0},               0,                   1, FLAGS, "in_transpose"},

  157.     { "out_trans", "transpose video output", OFFSET(out_transpose), AV_OPT_TYPE_BOOL,   {.i64=0},               0,                   1, FLAGS, "out_transpose"},

  158.     {    "ih_fov", "input horizontal field of view",OFFSET(ih_fov), AV_OPT_TYPE_FLOAT,  {.dbl=90.f},     0.00001f,               360.f,TFLAGS, "ih_fov"},

  159.     {    "iv_fov", "input vertical field of view",  OFFSET(iv_fov), AV_OPT_TYPE_FLOAT,  {.dbl=45.f},     0.00001f,               360.f,TFLAGS, "iv_fov"},

  160.     {    "id_fov", "input diagonal field of view",  OFFSET(id_fov), AV_OPT_TYPE_FLOAT,  {.dbl=0.f},           0.f,               360.f,TFLAGS, "id_fov"},

  161.     {"alpha_mask", "build mask in alpha plane",      OFFSET(alpha), AV_OPT_TYPE_BOOL,   {.i64=0},               0,                   1, FLAGS, "alpha"},

  162.     { NULL }

  163. };

  164. 

  165. AVFILTER_DEFINE_CLASS(v360);

  166. 

  167. static int query_formats(AVFilterContext *ctx)

  168. {

  169.     V360Context *s = ctx->priv;

  170.     static const enum AVPixelFormat pix_fmts[] = {

  171.         // YUVA444

  172.         AV_PIX_FMT_YUVA444P,   AV_PIX_FMT_YUVA444P9,

  173.         AV_PIX_FMT_YUVA444P10, AV_PIX_FMT_YUVA444P12,

  174.         AV_PIX_FMT_YUVA444P16,

  175. 

  176.         // YUVA422

  177.         AV_PIX_FMT_YUVA422P,   AV_PIX_FMT_YUVA422P9,

  178.         AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA422P12,

  179.         AV_PIX_FMT_YUVA422P16,

  180. 

  181.         // YUVA420

  182.         AV_PIX_FMT_YUVA420P,   AV_PIX_FMT_YUVA420P9,

  183.         AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA420P16,

  184. 

  185.         // YUVJ

  186.         AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,

  187.         AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,

  188.         AV_PIX_FMT_YUVJ411P,

  189. 

  190.         // YUV444

  191.         AV_PIX_FMT_YUV444P,   AV_PIX_FMT_YUV444P9,

  192.         AV_PIX_FMT_YUV444P10, AV_PIX_FMT_YUV444P12,

  193.         AV_PIX_FMT_YUV444P14, AV_PIX_FMT_YUV444P16,

  194. 

  195.         // YUV440

  196.         AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV440P10,

  197.         AV_PIX_FMT_YUV440P12,

  198. 

  199.         // YUV422

  200.         AV_PIX_FMT_YUV422P,   AV_PIX_FMT_YUV422P9,

  201.         AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV422P12,

  202.         AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV422P16,

  203. 

  204.         // YUV420

  205.         AV_PIX_FMT_YUV420P,   AV_PIX_FMT_YUV420P9,

  206.         AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV420P12,

  207.         AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV420P16,

  208. 

  209.         // YUV411

  210.         AV_PIX_FMT_YUV411P,

  211. 

  212.         // YUV410

  213.         AV_PIX_FMT_YUV410P,

  214. 

  215.         // GBR

  216.         AV_PIX_FMT_GBRP,   AV_PIX_FMT_GBRP9,

  217.         AV_PIX_FMT_GBRP10, AV_PIX_FMT_GBRP12,

  218.         AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,

  219. 

  220.         // GBRA

  221.         AV_PIX_FMT_GBRAP,   AV_PIX_FMT_GBRAP10,

  222.         AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRAP16,

  223. 

  224.         // GRAY

  225.         AV_PIX_FMT_GRAY8,  AV_PIX_FMT_GRAY9,

  226.         AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12,

  227.         AV_PIX_FMT_GRAY14, AV_PIX_FMT_GRAY16,

  228. 

  229.         AV_PIX_FMT_NONE

  230.     };

  231.     static const enum AVPixelFormat alpha_pix_fmts[] = {

  232.         AV_PIX_FMT_YUVA444P,   AV_PIX_FMT_YUVA444P9,

  233.         AV_PIX_FMT_YUVA444P10, AV_PIX_FMT_YUVA444P12,

  234.         AV_PIX_FMT_YUVA444P16,

  235.         AV_PIX_FMT_YUVA422P,   AV_PIX_FMT_YUVA422P9,

  236.         AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA422P12,

  237.         AV_PIX_FMT_YUVA422P16,

  238.         AV_PIX_FMT_YUVA420P,   AV_PIX_FMT_YUVA420P9,

  239.         AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA420P16,

  240.         AV_PIX_FMT_GBRAP,   AV_PIX_FMT_GBRAP10,

  241.         AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRAP16,

  242.         AV_PIX_FMT_NONE

  243.     };

  244. 

  245.     AVFilterFormats *fmts_list = ff_make_format_list(s->alpha ? alpha_pix_fmts : pix_fmts);

  246.     if (!fmts_list)

  247.         return AVERROR(ENOMEM);

  248.     return ff_set_common_formats(ctx, fmts_list);

  249. }

  250. 

  251. #define DEFINE_REMAP1_LINE(bits, div)                                                    \

  252. static void remap1_##bits##bit_line_c(uint8_t *dst, int width, const uint8_t *const src, \

  253.                                       ptrdiff_t in_linesize,                             \

  254.                                       const int16_t *const u, const int16_t *const v,    \

  255.                                       const int16_t *const ker)                          \

  256. {                                                                                        \

  257.     const uint##bits##_t *const s = (const uint##bits##_t *const)src;                    \

  258.     uint##bits##_t *d = (uint##bits##_t *)dst;                                           \

  259.                                                                                          \

  260.     in_linesize /= div;                                                                  \

  261.                                                                                          \

  262.     for (int x = 0; x < width; x++)                                                      \

  263.         d[x] = s[v[x] * in_linesize + u[x]];                                             \

  264. }

  265. 

  266. DEFINE_REMAP1_LINE( 8, 1)

  267. DEFINE_REMAP1_LINE(16, 2)

  268. 

  269. /**

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

  271.  *

  272.  * @param ws size of interpolation window

  273.  * @param bits number of bits per pixel

  274.  */

  275. #define DEFINE_REMAP(ws, bits)                                                                             \

  276. static int remap##ws##_##bits##bit_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)          \

  277. {                                                                                                          \

  278.     ThreadData *td = arg;                                                                                  \

  279.     const V360Context *s = ctx->priv;                                                                      \

  280.     const AVFrame *in = td->in;                                                                            \

  281.     AVFrame *out = td->out;                                                                                \

  282.                                                                                                            \

  283.     for (int stereo = 0; stereo < 1 + s->out_stereo > STEREO_2D; stereo++) {                               \

  284.         for (int plane = 0; plane < s->nb_planes; plane++) {                                               \

  285.             const unsigned map = s->map[plane];                                                            \

  286.             const int in_linesize  = in->linesize[plane];                                                  \

  287.             const int out_linesize = out->linesize[plane];                                                 \

  288.             const int uv_linesize = s->uv_linesize[plane];                                                 \

  289.             const int in_offset_w = stereo ? s->in_offset_w[plane] : 0;                                    \

  290.             const int in_offset_h = stereo ? s->in_offset_h[plane] : 0;                                    \

  291.             const int out_offset_w = stereo ? s->out_offset_w[plane] : 0;                                  \

  292.             const int out_offset_h = stereo ? s->out_offset_h[plane] : 0;                                  \

  293.             const uint8_t *const src = in->data[plane] +                                                   \

  294.                                                    in_offset_h * in_linesize + in_offset_w * (bits >> 3);  \

  295.             uint8_t *dst = out->data[plane] + out_offset_h * out_linesize + out_offset_w * (bits >> 3);    \

  296.             const uint8_t *mask = plane == 3 ? s->mask : NULL;                                             \

  297.             const int width = s->pr_width[plane];                                                          \

  298.             const int height = s->pr_height[plane];                                                        \

  299.                                                                                                            \

  300.             const int slice_start = (height *  jobnr     ) / nb_jobs;                                      \

  301.             const int slice_end   = (height * (jobnr + 1)) / nb_jobs;                                      \

  302.                                                                                                            \

  303.             for (int y = slice_start; y < slice_end && !mask; y++) {                                       \

  304.                 const int16_t *const u = s->u[map] + y * uv_linesize * ws * ws;                            \

  305.                 const int16_t *const v = s->v[map] + y * uv_linesize * ws * ws;                            \

  306.                 const int16_t *const ker = s->ker[map] + y * uv_linesize * ws * ws;                        \

  307.                                                                                                            \

  308.                 s->remap_line(dst + y * out_linesize, width, src, in_linesize, u, v, ker);                 \

  309.             }                                                                                              \

  310.                                                                                                            \

  311.             for (int y = slice_start; y < slice_end && mask; y++) {                                        \

  312.                 memcpy(dst + y * out_linesize, mask + y * width * (bits >> 3), width * (bits >> 3));       \

  313.             }                                                                                              \

  314.         }                                                                                                  \

  315.     }                                                                                                      \

  316.                                                                                                            \

  317.     return 0;                                                                                              \

  318. }

  319. 

  320. DEFINE_REMAP(1,  8)

  321. DEFINE_REMAP(2,  8)

  322. DEFINE_REMAP(3,  8)

  323. DEFINE_REMAP(4,  8)

  324. DEFINE_REMAP(1, 16)

  325. DEFINE_REMAP(2, 16)

  326. DEFINE_REMAP(3, 16)

  327. DEFINE_REMAP(4, 16)

  328. 

  329. #define DEFINE_REMAP_LINE(ws, bits, div)                                                      \

  330. static void remap##ws##_##bits##bit_line_c(uint8_t *dst, int width, const uint8_t *const src, \

  331.                                            ptrdiff_t in_linesize,                             \

  332.                                            const int16_t *const u, const int16_t *const v,    \

  333.                                            const int16_t *const ker)                          \

  334. {                                                                                             \

  335.     const uint##bits##_t *const s = (const uint##bits##_t *const)src;                         \

  336.     uint##bits##_t *d = (uint##bits##_t *)dst;                                                \

  337.                                                                                               \

  338.     in_linesize /= div;                                                                       \

  339.                                                                                               \

  340.     for (int x = 0; x < width; x++) {                                                         \

  341.         const int16_t *const uu = u + x * ws * ws;                                            \

  342.         const int16_t *const vv = v + x * ws * ws;                                            \

  343.         const int16_t *const kker = ker + x * ws * ws;                                        \

  344.         int tmp = 0;                                                                          \

  345.                                                                                               \

  346.         for (int i = 0; i < ws; i++) {                                                        \

  347.             for (int j = 0; j < ws; j++) {                                                    \

  348.                 tmp += kker[i * ws + j] * s[vv[i * ws + j] * in_linesize + uu[i * ws + j]];   \

  349.             }                                                                                 \

  350.         }                                                                                     \

  351.                                                                                               \

  352.         d[x] = av_clip_uint##bits(tmp >> 14);                                                 \

  353.     }                                                                                         \

  354. }

  355. 

  356. DEFINE_REMAP_LINE(2,  8, 1)

  357. DEFINE_REMAP_LINE(3,  8, 1)

  358. DEFINE_REMAP_LINE(4,  8, 1)

  359. DEFINE_REMAP_LINE(2, 16, 2)

  360. DEFINE_REMAP_LINE(3, 16, 2)

  361. DEFINE_REMAP_LINE(4, 16, 2)

  362. 

  363. void ff_v360_init(V360Context *s, int depth)

  364. {

  365.     switch (s->interp) {

  366.     case NEAREST:

  367.         s->remap_line = depth <= 8 ? remap1_8bit_line_c : remap1_16bit_line_c;

  368.         break;

  369.     case BILINEAR:

  370.         s->remap_line = depth <= 8 ? remap2_8bit_line_c : remap2_16bit_line_c;

  371.         break;

  372.     case LAGRANGE9:

  373.         s->remap_line = depth <= 8 ? remap3_8bit_line_c : remap3_16bit_line_c;

  374.         break;

  375.     case BICUBIC:

  376.     case LANCZOS:

  377.     case SPLINE16:

  378.     case GAUSSIAN:

  379.         s->remap_line = depth <= 8 ? remap4_8bit_line_c : remap4_16bit_line_c;

  380.         break;

  381.     }

  382. 

  383.     if (ARCH_X86)

  384.         ff_v360_init_x86(s, depth);

  385. }

  386. 

  387. /**

  388.  * Save nearest pixel coordinates for remapping.

  389.  *

  390.  * @param du horizontal relative coordinate

  391.  * @param dv vertical relative coordinate

  392.  * @param rmap calculated 4x4 window

  393.  * @param u u remap data

  394.  * @param v v remap data

  395.  * @param ker ker remap data

  396.  */

  397. static void nearest_kernel(float du, float dv, const XYRemap *rmap,

  398.                            int16_t *u, int16_t *v, int16_t *ker)

  399. {

  400.     const int i = lrintf(dv) + 1;

  401.     const int j = lrintf(du) + 1;

  402. 

  403.     u[0] = rmap->u[i][j];

  404.     v[0] = rmap->v[i][j];

  405. }

  406. 

  407. /**

  408.  * Calculate kernel for bilinear interpolation.

  409.  *

  410.  * @param du horizontal relative coordinate

  411.  * @param dv vertical relative coordinate

  412.  * @param rmap calculated 4x4 window

  413.  * @param u u remap data

  414.  * @param v v remap data

  415.  * @param ker ker remap data

  416.  */

  417. static void bilinear_kernel(float du, float dv, const XYRemap *rmap,

  418.                             int16_t *u, int16_t *v, int16_t *ker)

  419. {

  420.     for (int i = 0; i < 2; i++) {

  421.         for (int j = 0; j < 2; j++) {

  422.             u[i * 2 + j] = rmap->u[i + 1][j + 1];

  423.             v[i * 2 + j] = rmap->v[i + 1][j + 1];

  424.         }

  425.     }

  426. 

  427.     ker[0] = lrintf((1.f - du) * (1.f - dv) * 16385.f);

  428.     ker[1] = lrintf(       du  * (1.f - dv) * 16385.f);

  429.     ker[2] = lrintf((1.f - du) *        dv  * 16385.f);

  430.     ker[3] = lrintf(       du  *        dv  * 16385.f);

  431. }

  432. 

  433. /**

  434.  * Calculate 1-dimensional lagrange coefficients.

  435.  *

  436.  * @param t relative coordinate

  437.  * @param coeffs coefficients

  438.  */

  439. static inline void calculate_lagrange_coeffs(float t, float *coeffs)

  440. {

  441.     coeffs[0] = (t - 1.f) * (t - 2.f) * 0.5f;

  442.     coeffs[1] = -t * (t - 2.f);

  443.     coeffs[2] =  t * (t - 1.f) * 0.5f;

  444. }

  445. 

  446. /**

  447.  * Calculate kernel for lagrange interpolation.

  448.  *

  449.  * @param du horizontal relative coordinate

  450.  * @param dv vertical relative coordinate

  451.  * @param rmap calculated 4x4 window

  452.  * @param u u remap data

  453.  * @param v v remap data

  454.  * @param ker ker remap data

  455.  */

  456. static void lagrange_kernel(float du, float dv, const XYRemap *rmap,

  457.                             int16_t *u, int16_t *v, int16_t *ker)

  458. {

  459.     float du_coeffs[3];

  460.     float dv_coeffs[3];

  461. 

  462.     calculate_lagrange_coeffs(du, du_coeffs);

  463.     calculate_lagrange_coeffs(dv, dv_coeffs);

  464. 

  465.     for (int i = 0; i < 3; i++) {

  466.         for (int j = 0; j < 3; j++) {

  467.             u[i * 3 + j] = rmap->u[i + 1][j + 1];

  468.             v[i * 3 + j] = rmap->v[i + 1][j + 1];

  469.             ker[i * 3 + j] = lrintf(du_coeffs[j] * dv_coeffs[i] * 16385.f);

  470.         }

  471.     }

  472. }

  473. 

  474. /**

  475.  * Calculate 1-dimensional cubic coefficients.

  476.  *

  477.  * @param t relative coordinate

  478.  * @param coeffs coefficients

  479.  */

  480. static inline void calculate_bicubic_coeffs(float t, float *coeffs)

  481. {

  482.     const float tt  = t * t;

  483.     const float ttt = t * t * t;

  484. 

  485.     coeffs[0] =     - t / 3.f + tt / 2.f - ttt / 6.f;

  486.     coeffs[1] = 1.f - t / 2.f - tt       + ttt / 2.f;

  487.     coeffs[2] =       t       + tt / 2.f - ttt / 2.f;

  488.     coeffs[3] =     - t / 6.f            + ttt / 6.f;

  489. }

  490. 

  491. /**

  492.  * Calculate kernel for bicubic interpolation.

  493.  *

  494.  * @param du horizontal relative coordinate

  495.  * @param dv vertical relative coordinate

  496.  * @param rmap calculated 4x4 window

  497.  * @param u u remap data

  498.  * @param v v remap data

  499.  * @param ker ker remap data

  500.  */

  501. static void bicubic_kernel(float du, float dv, const XYRemap *rmap,

  502.                            int16_t *u, int16_t *v, int16_t *ker)

  503. {

  504.     float du_coeffs[4];

  505.     float dv_coeffs[4];

  506. 

  507.     calculate_bicubic_coeffs(du, du_coeffs);

  508.     calculate_bicubic_coeffs(dv, dv_coeffs);

  509. 

  510.     for (int i = 0; i < 4; i++) {

  511.         for (int j = 0; j < 4; j++) {

  512.             u[i * 4 + j] = rmap->u[i][j];

  513.             v[i * 4 + j] = rmap->v[i][j];

  514.             ker[i * 4 + j] = lrintf(du_coeffs[j] * dv_coeffs[i] * 16385.f);

  515.         }

  516.     }

  517. }

  518. 

  519. /**

  520.  * Calculate 1-dimensional lanczos coefficients.

  521.  *

  522.  * @param t relative coordinate

  523.  * @param coeffs coefficients

  524.  */

  525. static inline void calculate_lanczos_coeffs(float t, float *coeffs)

  526. {

  527.     float sum = 0.f;

  528. 

  529.     for (int i = 0; i < 4; i++) {

  530.         const float x = M_PI * (t - i + 1);

  531.         if (x == 0.f) {

  532.             coeffs[i] = 1.f;

  533.         } else {

  534.             coeffs[i] = sinf(x) * sinf(x / 2.f) / (x * x / 2.f);

  535.         }

  536.         sum += coeffs[i];

  537.     }

  538. 

  539.     for (int i = 0; i < 4; i++) {

  540.         coeffs[i] /= sum;

  541.     }

  542. }

  543. 

  544. /**

  545.  * Calculate kernel for lanczos interpolation.

  546.  *

  547.  * @param du horizontal relative coordinate

  548.  * @param dv vertical relative coordinate

  549.  * @param rmap calculated 4x4 window

  550.  * @param u u remap data

  551.  * @param v v remap data

  552.  * @param ker ker remap data

  553.  */

  554. static void lanczos_kernel(float du, float dv, const XYRemap *rmap,

  555.                            int16_t *u, int16_t *v, int16_t *ker)

  556. {

  557.     float du_coeffs[4];

  558.     float dv_coeffs[4];

  559. 

  560.     calculate_lanczos_coeffs(du, du_coeffs);

  561.     calculate_lanczos_coeffs(dv, dv_coeffs);

  562. 

  563.     for (int i = 0; i < 4; i++) {

  564.         for (int j = 0; j < 4; j++) {

  565.             u[i * 4 + j] = rmap->u[i][j];

  566.             v[i * 4 + j] = rmap->v[i][j];

  567.             ker[i * 4 + j] = lrintf(du_coeffs[j] * dv_coeffs[i] * 16385.f);

  568.         }

  569.     }

  570. }

  571. 

  572. /**

  573.  * Calculate 1-dimensional spline16 coefficients.

  574.  *

  575.  * @param t relative coordinate

  576.  * @param coeffs coefficients

  577.  */

  578. static void calculate_spline16_coeffs(float t, float *coeffs)

  579. {

  580.     coeffs[0] = ((-1.f / 3.f * t + 0.8f) * t - 7.f / 15.f) * t;

  581.     coeffs[1] = ((t - 9.f / 5.f) * t - 0.2f) * t + 1.f;

  582.     coeffs[2] = ((6.f / 5.f - t) * t + 0.8f) * t;

  583.     coeffs[3] = ((1.f / 3.f * t - 0.2f) * t - 2.f / 15.f) * t;

  584. }

  585. 

  586. /**

  587.  * Calculate kernel for spline16 interpolation.

  588.  *

  589.  * @param du horizontal relative coordinate

  590.  * @param dv vertical relative coordinate

  591.  * @param rmap calculated 4x4 window

  592.  * @param u u remap data

  593.  * @param v v remap data

  594.  * @param ker ker remap data

  595.  */

  596. static void spline16_kernel(float du, float dv, const XYRemap *rmap,

  597.                             int16_t *u, int16_t *v, int16_t *ker)

  598. {

  599.     float du_coeffs[4];

  600.     float dv_coeffs[4];

  601. 

  602.     calculate_spline16_coeffs(du, du_coeffs);

  603.     calculate_spline16_coeffs(dv, dv_coeffs);

  604. 

  605.     for (int i = 0; i < 4; i++) {

  606.         for (int j = 0; j < 4; j++) {

  607.             u[i * 4 + j] = rmap->u[i][j];

  608.             v[i * 4 + j] = rmap->v[i][j];

  609.             ker[i * 4 + j] = lrintf(du_coeffs[j] * dv_coeffs[i] * 16385.f);

  610.         }

  611.     }

  612. }

  613. 

  614. /**

  615.  * Calculate 1-dimensional gaussian coefficients.

  616.  *

  617.  * @param t relative coordinate

  618.  * @param coeffs coefficients

  619.  */

  620. static void calculate_gaussian_coeffs(float t, float *coeffs)

  621. {

  622.     float sum = 0.f;

  623. 

  624.     for (int i = 0; i < 4; i++) {

  625.         const float x = t - (i - 1);

  626.         if (x == 0.f) {

  627.             coeffs[i] = 1.f;

  628.         } else {

  629.             coeffs[i] = expf(-2.f * x * x) * expf(-x * x / 2.f);

  630.         }

  631.         sum += coeffs[i];

  632.     }

  633. 

  634.     for (int i = 0; i < 4; i++) {

  635.         coeffs[i] /= sum;

  636.     }

  637. }

  638. 

  639. /**

  640.  * Calculate kernel for gaussian interpolation.

  641.  *

  642.  * @param du horizontal relative coordinate

  643.  * @param dv vertical relative coordinate

  644.  * @param rmap calculated 4x4 window

  645.  * @param u u remap data

  646.  * @param v v remap data

  647.  * @param ker ker remap data

  648.  */

  649. static void gaussian_kernel(float du, float dv, const XYRemap *rmap,

  650.                             int16_t *u, int16_t *v, int16_t *ker)

  651. {

  652.     float du_coeffs[4];

  653.     float dv_coeffs[4];

  654. 

  655.     calculate_gaussian_coeffs(du, du_coeffs);

  656.     calculate_gaussian_coeffs(dv, dv_coeffs);

  657. 

  658.     for (int i = 0; i < 4; i++) {

  659.         for (int j = 0; j < 4; j++) {

  660.             u[i * 4 + j] = rmap->u[i][j];

  661.             v[i * 4 + j] = rmap->v[i][j];

  662.             ker[i * 4 + j] = lrintf(du_coeffs[j] * dv_coeffs[i] * 16385.f);

  663.         }

  664.     }

  665. }

  666. 

  667. /**

  668.  * Modulo operation with only positive remainders.

  669.  *

  670.  * @param a dividend

  671.  * @param b divisor

  672.  *

  673.  * @return positive remainder of (a / b)

  674.  */

  675. static inline int mod(int a, int b)

  676. {

  677.     const int res = a % b;

  678.     if (res < 0) {

  679.         return res + b;

  680.     } else {

  681.         return res;

  682.     }

  683. }

  684. 

  685. /**

  686.  * Reflect y operation.

  687.  *

  688.  * @param y input vertical position

  689.  * @param h input height

  690.  */

  691. static inline int reflecty(int y, int h)

  692. {

  693.     if (y < 0) {

  694.         return -y;

  695.     } else if (y >= h) {

  696.         return 2 * h - 1 - y;

  697.     }

  698. 

  699.     return y;

  700. }

  701. 

  702. /**

  703.  * Reflect x operation for equirect.

  704.  *

  705.  * @param x input horizontal position

  706.  * @param y input vertical position

  707.  * @param w input width

  708.  * @param h input height

  709.  */

  710. static inline int ereflectx(int x, int y, int w, int h)

  711. {

  712.     if (y < 0 || y >= h)

  713.         x += w / 2;

  714. 

  715.     return mod(x, w);

  716. }

  717. 

  718. /**

  719.  * Reflect x operation.

  720.  *

  721.  * @param x input horizontal position

  722.  * @param y input vertical position

  723.  * @param w input width

  724.  * @param h input height

  725.  */

  726. static inline int reflectx(int x, int y, int w, int h)

  727. {

  728.     if (y < 0 || y >= h)

  729.         return w - 1 - x;

  730. 

  731.     return mod(x, w);

  732. }

  733. 

  734. /**

  735.  * Convert char to corresponding direction.

  736.  * Used for cubemap options.

  737.  */

  738. static int get_direction(char c)

  739. {

  740.     switch (c) {

  741.     case 'r':

  742.         return RIGHT;

  743.     case 'l':

  744.         return LEFT;

  745.     case 'u':

  746.         return UP;

  747.     case 'd':

  748.         return DOWN;

  749.     case 'f':

  750.         return FRONT;

  751.     case 'b':

  752.         return BACK;

  753.     default:

  754.         return -1;

  755.     }

  756. }

  757. 

  758. /**

  759.  * Convert char to corresponding rotation angle.

  760.  * Used for cubemap options.

  761.  */

  762. static int get_rotation(char c)

  763. {

  764.     switch (c) {

  765.     case '0':

  766.         return ROT_0;

  767.     case '1':

  768.         return ROT_90;

  769.     case '2':

  770.         return ROT_180;

  771.     case '3':

  772.         return ROT_270;

  773.     default:

  774.         return -1;

  775.     }

  776. }

  777. 

  778. /**

  779.  * Convert char to corresponding rotation order.

  780.  */

  781. static int get_rorder(char c)

  782. {

  783.     switch (c) {

  784.     case 'Y':

  785.     case 'y':

  786.         return YAW;

  787.     case 'P':

  788.     case 'p':

  789.         return PITCH;

  790.     case 'R':

  791.     case 'r':

  792.         return ROLL;

  793.     default:

  794.         return -1;

  795.     }

  796. }

  797. 

  798. /**

  799.  * Prepare data for processing cubemap input format.

  800.  *

  801.  * @param ctx filter context

  802.  *

  803.  * @return error code

  804.  */

  805. static int prepare_cube_in(AVFilterContext *ctx)

  806. {

  807.     V360Context *s = ctx->priv;

  808. 

  809.     for (int face = 0; face < NB_FACES; face++) {

  810.         const char c = s->in_forder[face];

  811.         int direction;

  812. 

  813.         if (c == '\0') {

  814.             av_log(ctx, AV_LOG_ERROR,

  815.                    "Incomplete in_forder option. Direction for all 6 faces should be specified.\n");

  816.             return AVERROR(EINVAL);

  817.         }

  818. 

  819.         direction = get_direction(c);

  820.         if (direction == -1) {

  821.             av_log(ctx, AV_LOG_ERROR,

  822.                    "Incorrect direction symbol '%c' in in_forder option.\n", c);

  823.             return AVERROR(EINVAL);

  824.         }

  825. 

  826.         s->in_cubemap_face_order[direction] = face;

  827.     }

  828. 

  829.     for (int face = 0; face < NB_FACES; face++) {

  830.         const char c = s->in_frot[face];

  831.         int rotation;

  832. 

  833.         if (c == '\0') {

  834.             av_log(ctx, AV_LOG_ERROR,

  835.                    "Incomplete in_frot option. Rotation for all 6 faces should be specified.\n");

  836.             return AVERROR(EINVAL);

  837.         }

  838. 

  839.         rotation = get_rotation(c);

  840.         if (rotation == -1) {

  841.             av_log(ctx, AV_LOG_ERROR,

  842.                    "Incorrect rotation symbol '%c' in in_frot option.\n", c);

  843.             return AVERROR(EINVAL);

  844.         }

  845. 

  846.         s->in_cubemap_face_rotation[face] = rotation;

  847.     }

  848. 

  849.     return 0;

  850. }

  851. 

  852. /**

  853.  * Prepare data for processing cubemap output format.

  854.  *

  855.  * @param ctx filter context

  856.  *

  857.  * @return error code

  858.  */

  859. static int prepare_cube_out(AVFilterContext *ctx)

  860. {

  861.     V360Context *s = ctx->priv;

  862. 

  863.     for (int face = 0; face < NB_FACES; face++) {

  864.         const char c = s->out_forder[face];

  865.         int direction;

  866. 

  867.         if (c == '\0') {

  868.             av_log(ctx, AV_LOG_ERROR,

  869.                    "Incomplete out_forder option. Direction for all 6 faces should be specified.\n");

  870.             return AVERROR(EINVAL);

  871.         }

  872. 

  873.         direction = get_direction(c);

  874.         if (direction == -1) {

  875.             av_log(ctx, AV_LOG_ERROR,

  876.                    "Incorrect direction symbol '%c' in out_forder option.\n", c);

  877.             return AVERROR(EINVAL);

  878.         }

  879. 

  880.         s->out_cubemap_direction_order[face] = direction;

  881.     }

  882. 

  883.     for (int face = 0; face < NB_FACES; face++) {

  884.         const char c = s->out_frot[face];

  885.         int rotation;

  886. 

  887.         if (c == '\0') {

  888.             av_log(ctx, AV_LOG_ERROR,

  889.                    "Incomplete out_frot option. Rotation for all 6 faces should be specified.\n");

  890.             return AVERROR(EINVAL);

  891.         }

  892. 

  893.         rotation = get_rotation(c);

  894.         if (rotation == -1) {

  895.             av_log(ctx, AV_LOG_ERROR,

  896.                    "Incorrect rotation symbol '%c' in out_frot option.\n", c);

  897.             return AVERROR(EINVAL);

  898.         }

  899. 

  900.         s->out_cubemap_face_rotation[face] = rotation;

  901.     }

  902. 

  903.     return 0;

  904. }

  905. 

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

  907. {

  908.     float tmp;

  909. 

  910.     switch (rotation) {

  911.     case ROT_0:

  912.         break;

  913.     case ROT_90:

  914.         tmp =  *uf;

  915.         *uf = -*vf;

  916.         *vf =  tmp;

  917.         break;

  918.     case ROT_180:

  919.         *uf = -*uf;

  920.         *vf = -*vf;

  921.         break;

  922.     case ROT_270:

  923.         tmp = -*uf;

  924.         *uf =  *vf;

  925.         *vf =  tmp;

  926.         break;

  927.     default:

  928.         av_assert0(0);

  929.     }

  930. }

  931. 

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

  933. {

  934.     float tmp;

  935. 

  936.     switch (rotation) {

  937.     case ROT_0:

  938.         break;

  939.     case ROT_90:

  940.         tmp = -*uf;

  941.         *uf =  *vf;

  942.         *vf =  tmp;

  943.         break;

  944.     case ROT_180:

  945.         *uf = -*uf;

  946.         *vf = -*vf;

  947.         break;

  948.     case ROT_270:

  949.         tmp =  *uf;

  950.         *uf = -*vf;

  951.         *vf =  tmp;

  952.         break;

  953.     default:

  954.         av_assert0(0);

  955.     }

  956. }

  957. 

  958. /**

  959.  * Normalize vector.

  960.  *

  961.  * @param vec vector

  962.  */

  963. static void normalize_vector(float *vec)

  964. {

  965.     const float norm = sqrtf(vec[0] * vec[0] + vec[1] * vec[1] + vec[2] * vec[2]);

  966. 

  967.     vec[0] /= norm;

  968.     vec[1] /= norm;

  969.     vec[2] /= norm;

  970. }

  971. 

  972. /**

  973.  * Calculate 3D coordinates on sphere for corresponding cubemap position.

  974.  * Common operation for every cubemap.

  975.  *

  976.  * @param s filter private context

  977.  * @param uf horizontal cubemap coordinate [0, 1)

  978.  * @param vf vertical cubemap coordinate [0, 1)

  979.  * @param face face of cubemap

  980.  * @param vec coordinates on sphere

  981.  * @param scalew scale for uf

  982.  * @param scaleh scale for vf

  983.  */

  984. static void cube_to_xyz(const V360Context *s,

  985.                         float uf, float vf, int face,

  986.                         float *vec, float scalew, float scaleh)

  987. {

  988.     const int direction = s->out_cubemap_direction_order[face];

  989.     float l_x, l_y, l_z;

  990. 

  991.     uf /= scalew;

  992.     vf /= scaleh;

  993. 

  994.     rotate_cube_face_inverse(&uf, &vf, s->out_cubemap_face_rotation[face]);

  995. 

  996.     switch (direction) {

  997.     case RIGHT:

  998.         l_x =  1.f;

  999.         l_y =  vf;

  1000.         l_z = -uf;

  1001.         break;

  1002.     case LEFT:

  1003.         l_x = -1.f;

  1004.         l_y =  vf;

  1005.         l_z =  uf;

  1006.         break;

  1007.     case UP:

  1008.         l_x =  uf;

  1009.         l_y = -1.f;

  1010.         l_z =  vf;

  1011.         break;

  1012.     case DOWN:

  1013.         l_x =  uf;

  1014.         l_y =  1.f;

  1015.         l_z = -vf;

  1016.         break;

  1017.     case FRONT:

  1018.         l_x =  uf;

  1019.         l_y =  vf;

  1020.         l_z =  1.f;

  1021.         break;

  1022.     case BACK:

  1023.         l_x = -uf;

  1024.         l_y =  vf;

  1025.         l_z = -1.f;

  1026.         break;

  1027.     default:

  1028.         av_assert0(0);

  1029.     }

  1030. 

  1031.     vec[0] = l_x;

  1032.     vec[1] = l_y;

  1033.     vec[2] = l_z;

  1034. 

  1035.     normalize_vector(vec);

  1036. }

  1037. 

  1038. /**

  1039.  * Calculate cubemap position for corresponding 3D coordinates on sphere.

  1040.  * Common operation for every cubemap.

  1041.  *

  1042.  * @param s filter private context

  1043.  * @param vec coordinated on sphere

  1044.  * @param uf horizontal cubemap coordinate [0, 1)

  1045.  * @param vf vertical cubemap coordinate [0, 1)

  1046.  * @param direction direction of view

  1047.  */

  1048. static void xyz_to_cube(const V360Context *s,

  1049.                         const float *vec,

  1050.                         float *uf, float *vf, int *direction)

  1051. {

  1052.     const float phi   = atan2f(vec[0], vec[2]);

  1053.     const float theta = asinf(vec[1]);

  1054.     float phi_norm, theta_threshold;

  1055.     int face;

  1056. 

  1057.     if (phi >= -M_PI_4 && phi < M_PI_4) {

  1058.         *direction = FRONT;

  1059.         phi_norm = phi;

  1060.     } else if (phi >= -(M_PI_2 + M_PI_4) && phi < -M_PI_4) {

  1061.         *direction = LEFT;

  1062.         phi_norm = phi + M_PI_2;

  1063.     } else if (phi >= M_PI_4 && phi < M_PI_2 + M_PI_4) {

  1064.         *direction = RIGHT;

  1065.         phi_norm = phi - M_PI_2;

  1066.     } else {

  1067.         *direction = BACK;

  1068.         phi_norm = phi + ((phi > 0.f) ? -M_PI : M_PI);

  1069.     }

  1070. 

  1071.     theta_threshold = atanf(cosf(phi_norm));

  1072.     if (theta > theta_threshold) {

  1073.         *direction = DOWN;

  1074.     } else if (theta < -theta_threshold) {

  1075.         *direction = UP;

  1076.     }

  1077. 

  1078.     switch (*direction) {

  1079.     case RIGHT:

  1080.         *uf = -vec[2] / vec[0];

  1081.         *vf =  vec[1] / vec[0];

  1082.         break;

  1083.     case LEFT:

  1084.         *uf = -vec[2] / vec[0];

  1085.         *vf = -vec[1] / vec[0];

  1086.         break;

  1087.     case UP:

  1088.         *uf = -vec[0] / vec[1];

  1089.         *vf = -vec[2] / vec[1];

  1090.         break;

  1091.     case DOWN:

  1092.         *uf =  vec[0] / vec[1];

  1093.         *vf = -vec[2] / vec[1];

  1094.         break;

  1095.     case FRONT:

  1096.         *uf =  vec[0] / vec[2];

  1097.         *vf =  vec[1] / vec[2];

  1098.         break;

  1099.     case BACK:

  1100.         *uf =  vec[0] / vec[2];

  1101.         *vf = -vec[1] / vec[2];

  1102.         break;

  1103.     default:

  1104.         av_assert0(0);

  1105.     }

  1106. 

  1107.     face = s->in_cubemap_face_order[*direction];

  1108.     rotate_cube_face(uf, vf, s->in_cubemap_face_rotation[face]);

  1109. 

  1110.     (*uf) *= s->input_mirror_modifier[0];

  1111.     (*vf) *= s->input_mirror_modifier[1];

  1112. }

  1113. 

  1114. /**

  1115.  * Find position on another cube face in case of overflow/underflow.

  1116.  * Used for calculation of interpolation window.

  1117.  *

  1118.  * @param s filter private context

  1119.  * @param uf horizontal cubemap coordinate

  1120.  * @param vf vertical cubemap coordinate

  1121.  * @param direction direction of view

  1122.  * @param new_uf new horizontal cubemap coordinate

  1123.  * @param new_vf new vertical cubemap coordinate

  1124.  * @param face face position on cubemap

  1125.  */

  1126. static void process_cube_coordinates(const V360Context *s,

  1127.                                      float uf, float vf, int direction,

  1128.                                      float *new_uf, float *new_vf, int *face)

  1129. {

  1130.     /*

  1131.      *  Cubemap orientation

  1132.      *

  1133.      *           width

  1134.      *         <------->

  1135.      *         +-------+

  1136.      *         |       |                              U

  1137.      *         | up    |                   h       ------->

  1138.      * +-------+-------+-------+-------+ ^ e      |

  1139.      * |       |       |       |       | | i    V |

  1140.      * | left  | front | right | back  | | g      |

  1141.      * +-------+-------+-------+-------+ v h      v

  1142.      *         |       |                   t

  1143.      *         | down  |

  1144.      *         +-------+

  1145.      */

  1146. 

  1147.     *face = s->in_cubemap_face_order[direction];

  1148.     rotate_cube_face_inverse(&uf, &vf, s->in_cubemap_face_rotation[*face]);

  1149. 

  1150.     if ((uf < -1.f || uf >= 1.f) && (vf < -1.f || vf >= 1.f)) {

  1151.         // There are no pixels to use in this case

  1152.         *new_uf = uf;

  1153.         *new_vf = vf;

  1154.     } else if (uf < -1.f) {

  1155.         uf += 2.f;

  1156.         switch (direction) {

  1157.         case RIGHT:

  1158.             direction = FRONT;

  1159.             *new_uf =  uf;

  1160.             *new_vf =  vf;

  1161.             break;

  1162.         case LEFT:

  1163.             direction = BACK;

  1164.             *new_uf =  uf;

  1165.             *new_vf =  vf;

  1166.             break;

  1167.         case UP:

  1168.             direction = LEFT;

  1169.             *new_uf =  vf;

  1170.             *new_vf = -uf;

  1171.             break;

  1172.         case DOWN:

  1173.             direction = LEFT;

  1174.             *new_uf = -vf;

  1175.             *new_vf =  uf;

  1176.             break;

  1177.         case FRONT:

  1178.             direction = LEFT;

  1179.             *new_uf =  uf;

  1180.             *new_vf =  vf;

  1181.             break;

  1182.         case BACK:

  1183.             direction = RIGHT;

  1184.             *new_uf =  uf;

  1185.             *new_vf =  vf;

  1186.             break;

  1187.         default:

  1188.             av_assert0(0);

  1189.         }

  1190.     } else if (uf >= 1.f) {

  1191.         uf -= 2.f;

  1192.         switch (direction) {

  1193.         case RIGHT:

  1194.             direction = BACK;

  1195.             *new_uf =  uf;

  1196.             *new_vf =  vf;

  1197.             break;

  1198.         case LEFT:

  1199.             direction = FRONT;

  1200.             *new_uf =  uf;

  1201.             *new_vf =  vf;

  1202.             break;

  1203.         case UP:

  1204.             direction = RIGHT;

  1205.             *new_uf = -vf;

  1206.             *new_vf =  uf;

  1207.             break;

  1208.         case DOWN:

  1209.             direction = RIGHT;

  1210.             *new_uf =  vf;

  1211.             *new_vf = -uf;

  1212.             break;

  1213.         case FRONT:

  1214.             direction = RIGHT;

  1215.             *new_uf =  uf;

  1216.             *new_vf =  vf;

  1217.             break;

  1218.         case BACK:

  1219.             direction = LEFT;

  1220.             *new_uf =  uf;

  1221.             *new_vf =  vf;

  1222.             break;

  1223.         default:

  1224.             av_assert0(0);

  1225.         }

  1226.     } else if (vf < -1.f) {

  1227.         vf += 2.f;

  1228.         switch (direction) {

  1229.         case RIGHT:

  1230.             direction = UP;

  1231.             *new_uf =  vf;

  1232.             *new_vf = -uf;

  1233.             break;

  1234.         case LEFT:

  1235.             direction = UP;

  1236.             *new_uf = -vf;

  1237.             *new_vf =  uf;

  1238.             break;

  1239.         case UP:

  1240.             direction = BACK;

  1241.             *new_uf = -uf;

  1242.             *new_vf = -vf;

  1243.             break;

  1244.         case DOWN:

  1245.             direction = FRONT;

  1246.             *new_uf =  uf;

  1247.             *new_vf =  vf;

  1248.             break;

  1249.         case FRONT:

  1250.             direction = UP;

  1251.             *new_uf =  uf;

  1252.             *new_vf =  vf;

  1253.             break;

  1254.         case BACK:

  1255.             direction = UP;

  1256.             *new_uf = -uf;

  1257.             *new_vf = -vf;

  1258.             break;

  1259.         default:

  1260.             av_assert0(0);

  1261.         }

  1262.     } else if (vf >= 1.f) {

  1263.         vf -= 2.f;

  1264.         switch (direction) {

  1265.         case RIGHT:

  1266.             direction = DOWN;

  1267.             *new_uf = -vf;

  1268.             *new_vf =  uf;

  1269.             break;

  1270.         case LEFT:

  1271.             direction = DOWN;

  1272.             *new_uf =  vf;

  1273.             *new_vf = -uf;

  1274.             break;

  1275.         case UP:

  1276.             direction = FRONT;

  1277.             *new_uf =  uf;

  1278.             *new_vf =  vf;

  1279.             break;

  1280.         case DOWN:

  1281.             direction = BACK;

  1282.             *new_uf = -uf;

  1283.             *new_vf = -vf;

  1284.             break;

  1285.         case FRONT:

  1286.             direction = DOWN;

  1287.             *new_uf =  uf;

  1288.             *new_vf =  vf;

  1289.             break;

  1290.         case BACK:

  1291.             direction = DOWN;

  1292.             *new_uf = -uf;

  1293.             *new_vf = -vf;

  1294.             break;

  1295.         default:

  1296.             av_assert0(0);

  1297.         }

  1298.     } else {

  1299.         // Inside cube face

  1300.         *new_uf = uf;

  1301.         *new_vf = vf;

  1302.     }

  1303. 

  1304.     *face = s->in_cubemap_face_order[direction];

  1305.     rotate_cube_face(new_uf, new_vf, s->in_cubemap_face_rotation[*face]);

  1306. }

  1307. 

  1308. /**

  1309.  * Calculate 3D coordinates on sphere for corresponding frame position in cubemap3x2 format.

  1310.  *

  1311.  * @param s filter private context

  1312.  * @param i horizontal position on frame [0, width)

  1313.  * @param j vertical position on frame [0, height)

  1314.  * @param width frame width

  1315.  * @param height frame height

  1316.  * @param vec coordinates on sphere

  1317.  */

  1318. static int cube3x2_to_xyz(const V360Context *s,

  1319.                           int i, int j, int width, int height,

  1320.                           float *vec)

  1321. {

  1322.     const float scalew = s->fout_pad > 0 ? 1.f - s->fout_pad / (width  / 3.f) : 1.f - s->out_pad;

  1323.     const float scaleh = s->fout_pad > 0 ? 1.f - s->fout_pad / (height / 2.f) : 1.f - s->out_pad;

  1324. 

  1325.     const float ew = width  / 3.f;

  1326.     const float eh = height / 2.f;

  1327. 

  1328.     const int u_face = floorf(i / ew);

  1329.     const int v_face = floorf(j / eh);

  1330.     const int face = u_face + 3 * v_face;

  1331. 

  1332.     const int u_shift = ceilf(ew * u_face);

  1333.     const int v_shift = ceilf(eh * v_face);

  1334.     const int ewi = ceilf(ew * (u_face + 1)) - u_shift;

  1335.     const int ehi = ceilf(eh * (v_face + 1)) - v_shift;

  1336. 

  1337.     const float uf = 2.f * (i - u_shift + 0.5f) / ewi - 1.f;

  1338.     const float vf = 2.f * (j - v_shift + 0.5f) / ehi - 1.f;

  1339. 

  1340.     cube_to_xyz(s, uf, vf, face, vec, scalew, scaleh);

  1341. 

  1342.     return 1;

  1343. }

  1344. 

  1345. /**

  1346.  * Calculate frame position in cubemap3x2 format for corresponding 3D coordinates on sphere.

  1347.  *

  1348.  * @param s filter private context

  1349.  * @param vec coordinates on sphere

  1350.  * @param width frame width

  1351.  * @param height frame height

  1352.  * @param us horizontal coordinates for interpolation window

  1353.  * @param vs vertical coordinates for interpolation window

  1354.  * @param du horizontal relative coordinate

  1355.  * @param dv vertical relative coordinate

  1356.  */

  1357. static int xyz_to_cube3x2(const V360Context *s,

  1358.                           const float *vec, int width, int height,

  1359.                           int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)

  1360. {

  1361.     const float scalew = s->fin_pad > 0 ? 1.f - s->fin_pad / (width  / 3.f) : 1.f - s->in_pad;

  1362.     const float scaleh = s->fin_pad > 0 ? 1.f - s->fin_pad / (height / 2.f) : 1.f - s->in_pad;

  1363.     const float ew = width  / 3.f;

  1364.     const float eh = height / 2.f;

  1365.     float uf, vf;

  1366.     int ui, vi;

  1367.     int ewi, ehi;

  1368.     int direction, face;

  1369.     int u_face, v_face;

  1370. 

  1371.     xyz_to_cube(s, vec, &uf, &vf, &direction);

  1372. 

  1373.     uf *= scalew;

  1374.     vf *= scaleh;

  1375. 

  1376.     face = s->in_cubemap_face_order[direction];

  1377.     u_face = face % 3;

  1378.     v_face = face / 3;

  1379.     ewi = ceilf(ew * (u_face + 1)) - ceilf(ew * u_face);

  1380.     ehi = ceilf(eh * (v_face + 1)) - ceilf(eh * v_face);

  1381. 

  1382.     uf = 0.5f * ewi * (uf + 1.f) - 0.5f;

  1383.     vf = 0.5f * ehi * (vf + 1.f) - 0.5f;

  1384. 

  1385.     ui = floorf(uf);

  1386.     vi = floorf(vf);

  1387. 

  1388.     *du = uf - ui;

  1389.     *dv = vf - vi;

  1390. 

  1391.     for (int i = 0; i < 4; i++) {

  1392.         for (int j = 0; j < 4; j++) {

  1393.             int new_ui = ui + j - 1;

  1394.             int new_vi = vi + i - 1;

  1395.             int u_shift, v_shift;

  1396.             int new_ewi, new_ehi;

  1397. 

  1398.             if (new_ui >= 0 && new_ui < ewi && new_vi >= 0 && new_vi < ehi) {

  1399.                 face = s->in_cubemap_face_order[direction];

  1400. 

  1401.                 u_face = face % 3;

  1402.                 v_face = face / 3;

  1403.                 u_shift = ceilf(ew * u_face);

  1404.                 v_shift = ceilf(eh * v_face);

  1405.             } else {

  1406.                 uf = 2.f * new_ui / ewi - 1.f;

  1407.                 vf = 2.f * new_vi / ehi - 1.f;

  1408. 

  1409.                 uf /= scalew;

  1410.                 vf /= scaleh;

  1411. 

  1412.                 process_cube_coordinates(s, uf, vf, direction, &uf, &vf, &face);

  1413. 

  1414.                 uf *= scalew;

  1415.                 vf *= scaleh;

  1416. 

  1417.                 u_face = face % 3;

  1418.                 v_face = face / 3;

  1419.                 u_shift = ceilf(ew * u_face);

  1420.                 v_shift = ceilf(eh * v_face);

  1421.                 new_ewi = ceilf(ew * (u_face + 1)) - u_shift;

  1422.                 new_ehi = ceilf(eh * (v_face + 1)) - v_shift;

  1423. 

  1424.                 new_ui = av_clip(lrintf(0.5f * new_ewi * (uf + 1.f)), 0, new_ewi - 1);

  1425.                 new_vi = av_clip(lrintf(0.5f * new_ehi * (vf + 1.f)), 0, new_ehi - 1);

  1426.             }

  1427. 

  1428.             us[i][j] = u_shift + new_ui;

  1429.             vs[i][j] = v_shift + new_vi;

  1430.         }

  1431.     }

  1432. 

  1433.     return 1;

  1434. }

  1435. 

  1436. /**

  1437.  * Calculate 3D coordinates on sphere for corresponding frame position in cubemap1x6 format.

  1438.  *

  1439.  * @param s filter private context

  1440.  * @param i horizontal position on frame [0, width)

  1441.  * @param j vertical position on frame [0, height)

  1442.  * @param width frame width

  1443.  * @param height frame height

  1444.  * @param vec coordinates on sphere

  1445.  */

  1446. static int cube1x6_to_xyz(const V360Context *s,

  1447.                           int i, int j, int width, int height,

  1448.                           float *vec)

  1449. {

  1450.     const float scalew = s->fout_pad > 0 ? 1.f - (float)(s->fout_pad) / width : 1.f - s->out_pad;

  1451.     const float scaleh = s->fout_pad > 0 ? 1.f - s->fout_pad / (height / 6.f) : 1.f - s->out_pad;

  1452. 

  1453.     const float ew = width;

  1454.     const float eh = height / 6.f;

  1455. 

  1456.     const int face = floorf(j / eh);

  1457. 

  1458.     const int v_shift = ceilf(eh * face);

  1459.     const int ehi = ceilf(eh * (face + 1)) - v_shift;

  1460. 

  1461.     const float uf = 2.f * (i           + 0.5f) / ew  - 1.f;

  1462.     const float vf = 2.f * (j - v_shift + 0.5f) / ehi - 1.f;

  1463. 

  1464.     cube_to_xyz(s, uf, vf, face, vec, scalew, scaleh);

  1465. 

  1466.     return 1;

  1467. }

  1468. 

  1469. /**

  1470.  * Calculate 3D coordinates on sphere for corresponding frame position in cubemap6x1 format.

  1471.  *

  1472.  * @param s filter private context

  1473.  * @param i horizontal position on frame [0, width)

  1474.  * @param j vertical position on frame [0, height)

  1475.  * @param width frame width

  1476.  * @param height frame height

  1477.  * @param vec coordinates on sphere

  1478.  */

  1479. static int cube6x1_to_xyz(const V360Context *s,

  1480.                           int i, int j, int width, int height,

  1481.                           float *vec)

  1482. {

  1483.     const float scalew = s->fout_pad > 0 ? 1.f - s->fout_pad / (width / 6.f)   : 1.f - s->out_pad;

  1484.     const float scaleh = s->fout_pad > 0 ? 1.f - (float)(s->fout_pad) / height : 1.f - s->out_pad;

  1485. 

  1486.     const float ew = width / 6.f;

  1487.     const float eh = height;

  1488. 

  1489.     const int face = floorf(i / ew);

  1490. 

  1491.     const int u_shift = ceilf(ew * face);

  1492.     const int ewi = ceilf(ew * (face + 1)) - u_shift;

  1493. 

  1494.     const float uf = 2.f * (i - u_shift + 0.5f) / ewi - 1.f;

  1495.     const float vf = 2.f * (j           + 0.5f) / eh  - 1.f;

  1496. 

  1497.     cube_to_xyz(s, uf, vf, face, vec, scalew, scaleh);

  1498. 

  1499.     return 1;

  1500. }

  1501. 

  1502. /**

  1503.  * Calculate frame position in cubemap1x6 format for corresponding 3D coordinates on sphere.

  1504.  *

  1505.  * @param s filter private context

  1506.  * @param vec coordinates on sphere

  1507.  * @param width frame width

  1508.  * @param height frame height

  1509.  * @param us horizontal coordinates for interpolation window

  1510.  * @param vs vertical coordinates for interpolation window

  1511.  * @param du horizontal relative coordinate

  1512.  * @param dv vertical relative coordinate

  1513.  */

  1514. static int xyz_to_cube1x6(const V360Context *s,

  1515.                           const float *vec, int width, int height,

  1516.                           int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)

  1517. {

  1518.     const float scalew = s->fin_pad > 0 ? 1.f - (float)(s->fin_pad) / width : 1.f - s->in_pad;

  1519.     const float scaleh = s->fin_pad > 0 ? 1.f - s->fin_pad / (height / 6.f) : 1.f - s->in_pad;

  1520.     const float eh = height / 6.f;

  1521.     const int ewi = width;

  1522.     float uf, vf;

  1523.     int ui, vi;

  1524.     int ehi;

  1525.     int direction, face;

  1526. 

  1527.     xyz_to_cube(s, vec, &uf, &vf, &direction);

  1528. 

  1529.     uf *= scalew;

  1530.     vf *= scaleh;

  1531. 

  1532.     face = s->in_cubemap_face_order[direction];

  1533.     ehi = ceilf(eh * (face + 1)) - ceilf(eh * face);

  1534. 

  1535.     uf = 0.5f * ewi * (uf + 1.f) - 0.5f;

  1536.     vf = 0.5f * ehi * (vf + 1.f) - 0.5f;

  1537. 

  1538.     ui = floorf(uf);

  1539.     vi = floorf(vf);

  1540. 

  1541.     *du = uf - ui;

  1542.     *dv = vf - vi;

  1543. 

  1544.     for (int i = 0; i < 4; i++) {

  1545.         for (int j = 0; j < 4; j++) {

  1546.             int new_ui = ui + j - 1;

  1547.             int new_vi = vi + i - 1;

  1548.             int v_shift;

  1549.             int new_ehi;

  1550. 

  1551.             if (new_ui >= 0 && new_ui < ewi && new_vi >= 0 && new_vi < ehi) {

  1552.                 face = s->in_cubemap_face_order[direction];

  1553. 

  1554.                 v_shift = ceilf(eh * face);

  1555.             } else {

  1556.                 uf = 2.f * new_ui / ewi - 1.f;

  1557.                 vf = 2.f * new_vi / ehi - 1.f;

  1558. 

  1559.                 uf /= scalew;

  1560.                 vf /= scaleh;

  1561. 

  1562.                 process_cube_coordinates(s, uf, vf, direction, &uf, &vf, &face);

  1563. 

  1564.                 uf *= scalew;

  1565.                 vf *= scaleh;

  1566. 

  1567.                 v_shift = ceilf(eh * face);

  1568.                 new_ehi = ceilf(eh * (face + 1)) - v_shift;

  1569. 

  1570.                 new_ui = av_clip(lrintf(0.5f *     ewi * (uf + 1.f)), 0,     ewi - 1);

  1571.                 new_vi = av_clip(lrintf(0.5f * new_ehi * (vf + 1.f)), 0, new_ehi - 1);

  1572.             }

  1573. 

  1574.             us[i][j] =           new_ui;

  1575.             vs[i][j] = v_shift + new_vi;

  1576.         }

  1577.     }

  1578. 

  1579.     return 1;

  1580. }

  1581. 

  1582. /**

  1583.  * Calculate frame position in cubemap6x1 format for corresponding 3D coordinates on sphere.

  1584.  *

  1585.  * @param s filter private context

  1586.  * @param vec coordinates on sphere

  1587.  * @param width frame width

  1588.  * @param height frame height

  1589.  * @param us horizontal coordinates for interpolation window

  1590.  * @param vs vertical coordinates for interpolation window

  1591.  * @param du horizontal relative coordinate

  1592.  * @param dv vertical relative coordinate

  1593.  */

  1594. static int xyz_to_cube6x1(const V360Context *s,

  1595.                           const float *vec, int width, int height,

  1596.                           int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)

  1597. {

  1598.     const float scalew = s->fin_pad > 0 ? 1.f - s->fin_pad / (width / 6.f)   : 1.f - s->in_pad;

  1599.     const float scaleh = s->fin_pad > 0 ? 1.f - (float)(s->fin_pad) / height : 1.f - s->in_pad;

  1600.     const float ew = width / 6.f;

  1601.     const int ehi = height;

  1602.     float uf, vf;

  1603.     int ui, vi;

  1604.     int ewi;

  1605.     int direction, face;

  1606. 

  1607.     xyz_to_cube(s, vec, &uf, &vf, &direction);

  1608. 

  1609.     uf *= scalew;

  1610.     vf *= scaleh;

  1611. 

  1612.     face = s->in_cubemap_face_order[direction];

  1613.     ewi = ceilf(ew * (face + 1)) - ceilf(ew * face);

  1614. 

  1615.     uf = 0.5f * ewi * (uf + 1.f) - 0.5f;

  1616.     vf = 0.5f * ehi * (vf + 1.f) - 0.5f;

  1617. 

  1618.     ui = floorf(uf);

  1619.     vi = floorf(vf);

  1620. 

  1621.     *du = uf - ui;

  1622.     *dv = vf - vi;

  1623. 

  1624.     for (int i = 0; i < 4; i++) {

  1625.         for (int j = 0; j < 4; j++) {

  1626.             int new_ui = ui + j - 1;

  1627.             int new_vi = vi + i - 1;

  1628.             int u_shift;

  1629.             int new_ewi;

  1630. 

  1631.             if (new_ui >= 0 && new_ui < ewi && new_vi >= 0 && new_vi < ehi) {

  1632.                 face = s->in_cubemap_face_order[direction];

  1633. 

  1634.                 u_shift = ceilf(ew * face);

  1635.             } else {

  1636.                 uf = 2.f * new_ui / ewi - 1.f;

  1637.                 vf = 2.f * new_vi / ehi - 1.f;

  1638. 

  1639.                 uf /= scalew;

  1640.                 vf /= scaleh;

  1641. 

  1642.                 process_cube_coordinates(s, uf, vf, direction, &uf, &vf, &face);

  1643. 

  1644.                 uf *= scalew;

  1645.                 vf *= scaleh;

  1646. 

  1647.                 u_shift = ceilf(ew * face);

  1648.                 new_ewi = ceilf(ew * (face + 1)) - u_shift;

  1649. 

  1650.                 new_ui = av_clip(lrintf(0.5f * new_ewi * (uf + 1.f)), 0, new_ewi - 1);

  1651.                 new_vi = av_clip(lrintf(0.5f *     ehi * (vf + 1.f)), 0,     ehi - 1);

  1652.             }

  1653. 

  1654.             us[i][j] = u_shift + new_ui;

  1655.             vs[i][j] =           new_vi;

  1656.         }

  1657.     }

  1658. 

  1659.     return 1;

  1660. }

  1661. 

  1662. /**

  1663.  * Calculate 3D coordinates on sphere for corresponding frame position in equirectangular format.

  1664.  *

  1665.  * @param s filter private context

  1666.  * @param i horizontal position on frame [0, width)

  1667.  * @param j vertical position on frame [0, height)

  1668.  * @param width frame width

  1669.  * @param height frame height

  1670.  * @param vec coordinates on sphere

  1671.  */

  1672. static int equirect_to_xyz(const V360Context *s,

  1673.                            int i, int j, int width, int height,

  1674.                            float *vec)

  1675. {

  1676.     const float phi   = ((2.f * i + 0.5f) / width  - 1.f) * M_PI;

  1677.     const float theta = ((2.f * j + 0.5f) / height - 1.f) * M_PI_2;

  1678. 

  1679.     const float sin_phi   = sinf(phi);

  1680.     const float cos_phi   = cosf(phi);

  1681.     const float sin_theta = sinf(theta);

  1682.     const float cos_theta = cosf(theta);

  1683. 

  1684.     vec[0] = cos_theta * sin_phi;

  1685.     vec[1] = sin_theta;

  1686.     vec[2] = cos_theta * cos_phi;

  1687. 

  1688.     return 1;

  1689. }

  1690. 

  1691. /**

  1692.  * Calculate 3D coordinates on sphere for corresponding frame position in half equirectangular format.

  1693.  *

  1694.  * @param s filter private context

  1695.  * @param i horizontal position on frame [0, width)

  1696.  * @param j vertical position on frame [0, height)

  1697.  * @param width frame width

  1698.  * @param height frame height

  1699.  * @param vec coordinates on sphere

  1700.  */

  1701. static int hequirect_to_xyz(const V360Context *s,

  1702.                             int i, int j, int width, int height,

  1703.                             float *vec)

  1704. {

  1705.     const float phi   = ((2.f * i + 0.5f) / width  - 1.f) * M_PI_2;

  1706.     const float theta = ((2.f * j + 0.5f) / height - 1.f) * M_PI_2;

  1707. 

  1708.     const float sin_phi   = sinf(phi);

  1709.     const float cos_phi   = cosf(phi);

  1710.     const float sin_theta = sinf(theta);

  1711.     const float cos_theta = cosf(theta);

  1712. 

  1713.     vec[0] = cos_theta * sin_phi;

  1714.     vec[1] = sin_theta;

  1715.     vec[2] = cos_theta * cos_phi;

  1716. 

  1717.     return 1;

  1718. }

  1719. 

  1720. /**

  1721.  * Prepare data for processing stereographic output format.

  1722.  *

  1723.  * @param ctx filter context

  1724.  *

  1725.  * @return error code

  1726.  */

  1727. static int prepare_stereographic_out(AVFilterContext *ctx)

  1728. {

  1729.     V360Context *s = ctx->priv;

  1730. 

  1731.     s->flat_range[0] = tanf(FFMIN(s->h_fov, 359.f) * M_PI / 720.f);

  1732.     s->flat_range[1] = tanf(FFMIN(s->v_fov, 359.f) * M_PI / 720.f);

  1733. 

  1734.     return 0;

  1735. }

  1736. 

  1737. /**

  1738.  * Calculate 3D coordinates on sphere for corresponding frame position in stereographic format.

  1739.  *

  1740.  * @param s filter private context

  1741.  * @param i horizontal position on frame [0, width)

  1742.  * @param j vertical position on frame [0, height)

  1743.  * @param width frame width

  1744.  * @param height frame height

  1745.  * @param vec coordinates on sphere

  1746.  */

  1747. static int stereographic_to_xyz(const V360Context *s,

  1748.                                 int i, int j, int width, int height,

  1749.                                 float *vec)

  1750. {

  1751.     const float x = ((2.f * i + 1.f) / width  - 1.f) * s->flat_range[0];

  1752.     const float y = ((2.f * j + 1.f) / height - 1.f) * s->flat_range[1];

  1753.     const float r = hypotf(x, y);

  1754.     const float theta = atanf(r) * 2.f;

  1755.     const float sin_theta = sinf(theta);

  1756. 

  1757.     vec[0] = x / r * sin_theta;

  1758.     vec[1] = y / r * sin_theta;

  1759.     vec[2] = cosf(theta);

  1760. 

  1761.     normalize_vector(vec);

  1762. 

  1763.     return 1;

  1764. }

  1765. 

  1766. /**

  1767.  * Prepare data for processing stereographic input format.

  1768.  *

  1769.  * @param ctx filter context

  1770.  *

  1771.  * @return error code

  1772.  */

  1773. static int prepare_stereographic_in(AVFilterContext *ctx)

  1774. {

  1775.     V360Context *s = ctx->priv;

  1776. 

  1777.     s->iflat_range[0] = tanf(FFMIN(s->ih_fov, 359.f) * M_PI / 720.f);

  1778.     s->iflat_range[1] = tanf(FFMIN(s->iv_fov, 359.f) * M_PI / 720.f);

  1779. 

  1780.     return 0;

  1781. }

  1782. 

  1783. /**

  1784.  * Calculate frame position in stereographic format for corresponding 3D coordinates on sphere.

  1785.  *

  1786.  * @param s filter private context

  1787.  * @param vec coordinates on sphere

  1788.  * @param width frame width

  1789.  * @param height frame height

  1790.  * @param us horizontal coordinates for interpolation window

  1791.  * @param vs vertical coordinates for interpolation window

  1792.  * @param du horizontal relative coordinate

  1793.  * @param dv vertical relative coordinate

  1794.  */

  1795. static int xyz_to_stereographic(const V360Context *s,

  1796.                                 const float *vec, int width, int height,

  1797.                                 int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)

  1798. {

  1799.     const float theta = acosf(vec[2]);

  1800.     const float r = tanf(theta * 0.5f);

  1801.     const float c = r / hypotf(vec[0], vec[1]);

  1802.     const float x = vec[0] * c / s->iflat_range[0] * s->input_mirror_modifier[0];

  1803.     const float y = vec[1] * c / s->iflat_range[1] * s->input_mirror_modifier[1];

  1804. 

  1805.     const float uf = (x + 1.f) * width  / 2.f;

  1806.     const float vf = (y + 1.f) * height / 2.f;

  1807. 

  1808.     const int ui = floorf(uf);

  1809.     const int vi = floorf(vf);

  1810. 

  1811.     const int visible = isfinite(x) && isfinite(y) && vi >= 0 && vi < height && ui >= 0 && ui < width;

  1812. 

  1813.     *du = visible ? uf - ui : 0.f;

  1814.     *dv = visible ? vf - vi : 0.f;

  1815. 

  1816.     for (int i = 0; i < 4; i++) {

  1817.         for (int j = 0; j < 4; j++) {

  1818.             us[i][j] = visible ? av_clip(ui + j - 1, 0, width  - 1) : 0;

  1819.             vs[i][j] = visible ? av_clip(vi + i - 1, 0, height - 1) : 0;

  1820.         }

  1821.     }

  1822. 

  1823.     return visible;

  1824. }

  1825. 

  1826. /**

  1827.  * Prepare data for processing equisolid output format.

  1828.  *

  1829.  * @param ctx filter context

  1830.  *

  1831.  * @return error code

  1832.  */

  1833. static int prepare_equisolid_out(AVFilterContext *ctx)

  1834. {

  1835.     V360Context *s = ctx->priv;

  1836. 

  1837.     s->flat_range[0] = sinf(s->h_fov * M_PI / 720.f);

  1838.     s->flat_range[1] = sinf(s->v_fov * M_PI / 720.f);

  1839. 

  1840.     return 0;

  1841. }

  1842. 

  1843. /**

  1844.  * Calculate 3D coordinates on sphere for corresponding frame position in equisolid format.

  1845.  *

  1846.  * @param s filter private context

  1847.  * @param i horizontal position on frame [0, width)

  1848.  * @param j vertical position on frame [0, height)

  1849.  * @param width frame width

  1850.  * @param height frame height

  1851.  * @param vec coordinates on sphere

  1852.  */

  1853. static int equisolid_to_xyz(const V360Context *s,

  1854.                             int i, int j, int width, int height,

  1855.                             float *vec)

  1856. {

  1857.     const float x = ((2.f * i + 1.f) / width  - 1.f) * s->flat_range[0];

  1858.     const float y = ((2.f * j + 1.f) / height - 1.f) * s->flat_range[1];

  1859.     const float r = hypotf(x, y);

  1860.     const float theta = asinf(r) * 2.f;

  1861.     const float sin_theta = sinf(theta);

  1862. 

  1863.     vec[0] = x / r * sin_theta;

  1864.     vec[1] = y / r * sin_theta;

  1865.     vec[2] = cosf(theta);

  1866. 

  1867.     normalize_vector(vec);

  1868. 

  1869.     return 1;

  1870. }

  1871. 

  1872. /**

  1873.  * Prepare data for processing equisolid input format.

  1874.  *

  1875.  * @param ctx filter context

  1876.  *

  1877.  * @return error code

  1878.  */

  1879. static int prepare_equisolid_in(AVFilterContext *ctx)

  1880. {

  1881.     V360Context *s = ctx->priv;

  1882. 

  1883.     s->iflat_range[0] = sinf(FFMIN(s->ih_fov, 359.f) * M_PI / 720.f);

  1884.     s->iflat_range[1] = sinf(FFMIN(s->iv_fov, 359.f) * M_PI / 720.f);

  1885. 

  1886.     return 0;

  1887. }

  1888. 

  1889. /**

  1890.  * Calculate frame position in equisolid format for corresponding 3D coordinates on sphere.

  1891.  *

  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

  1900.  */

  1901. static int xyz_to_equisolid(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)

  1904. {

  1905.     const float theta = acosf(vec[2]);

  1906.     const float r = sinf(theta * 0.5f);

  1907.     const float c = r / hypotf(vec[0], vec[1]);

  1908.     const float x = vec[0] * c / s->iflat_range[0] * s->input_mirror_modifier[0];

  1909.     const float y = vec[1] * c / s->iflat_range[1] * s->input_mirror_modifier[1];

  1910. 

  1911.     const float uf = (x + 1.f) * width  / 2.f;

  1912.     const float vf = (y + 1.f) * height / 2.f;

  1913. 

  1914.     const int ui = floorf(uf);

  1915.     const int vi = floorf(vf);

  1916. 

  1917.     const int visible = isfinite(x) && isfinite(y) && vi >= 0 && vi < height && ui >= 0 && ui < width;

  1918. 

  1919.     *du = visible ? uf - ui : 0.f;

  1920.     *dv = visible ? vf - vi : 0.f;

  1921. 

  1922.     for (int i = 0; i < 4; i++) {

  1923.         for (int j = 0; j < 4; j++) {

  1924.             us[i][j] = visible ? av_clip(ui + j - 1, 0, width  - 1) : 0;

  1925.             vs[i][j] = visible ? av_clip(vi + i - 1, 0, height - 1) : 0;

  1926.         }

  1927.     }

  1928. 

  1929.     return visible;

  1930. }

  1931. 

  1932. /**

  1933.  * Prepare data for processing orthographic output format.

  1934.  *

  1935.  * @param ctx filter context

  1936.  *

  1937.  * @return error code

  1938.  */

  1939. static int prepare_orthographic_out(AVFilterContext *ctx)

  1940. {

  1941.     V360Context *s = ctx->priv;

  1942. 

  1943.     s->flat_range[0] = sinf(FFMIN(s->h_fov, 180.f) * M_PI / 360.f);

  1944.     s->flat_range[1] = sinf(FFMIN(s->v_fov, 180.f) * M_PI / 360.f);

  1945. 

  1946.     return 0;

  1947. }

  1948. 

  1949. /**

  1950.  * Calculate 3D coordinates on sphere for corresponding frame position in orthographic format.

  1951.  *

  1952.  * @param s filter private context

  1953.  * @param i horizontal position on frame [0, width)

  1954.  * @param j vertical position on frame [0, height)

  1955.  * @param width frame width

  1956.  * @param height frame height

  1957.  * @param vec coordinates on sphere

  1958.  */

  1959. static int orthographic_to_xyz(const V360Context *s,

  1960.                                int i, int j, int width, int height,

  1961.                                float *vec)

  1962. {

  1963.     const float x = ((2.f * i + 1.f) / width  - 1.f) * s->flat_range[0];

  1964.     const float y = ((2.f * j + 1.f) / height - 1.f) * s->flat_range[1];

  1965.     const float r = hypotf(x, y);

  1966.     const float theta = asinf(r);

  1967. 

  1968.     vec[0] = x;

  1969.     vec[1] = y;

  1970.     vec[2] = cosf(theta);

  1971. 

  1972.     normalize_vector(vec);

  1973. 

  1974.     return 1;

  1975. }

  1976. 

  1977. /**

  1978.  * Prepare data for processing orthographic input format.

  1979.  *

  1980.  * @param ctx filter context

  1981.  *

  1982.  * @return error code

  1983.  */

  1984. static int prepare_orthographic_in(AVFilterContext *ctx)

  1985. {

  1986.     V360Context *s = ctx->priv;

  1987. 

  1988.     s->iflat_range[0] = sinf(FFMIN(s->ih_fov, 180.f) * M_PI / 360.f);

  1989.     s->iflat_range[1] = sinf(FFMIN(s->iv_fov, 180.f) * M_PI / 360.f);

  1990. 

  1991.     return 0;

  1992. }

  1993. 

  1994. /**

  1995.  * Calculate frame position in orthographic format for corresponding 3D coordinates on sphere.

  1996.  *

  1997.  * @param s filter private context

  1998.  * @param vec coordinates on sphere

  1999.  * @param width frame width

  2000.  * @param height frame height

  2001.  * @param us horizontal coordinates for interpolation window

  2002.  * @param vs vertical coordinates for interpolation window

  2003.  * @param du horizontal relative coordinate

  2004.  * @param dv vertical relative coordinate

  2005.  */

  2006. static int xyz_to_orthographic(const V360Context *s,

  2007.                                const float *vec, int width, int height,

  2008.                                int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)

  2009. {

  2010.     const float theta = acosf(vec[2]);

  2011.     const float r = sinf(theta);

  2012.     const float c = r / hypotf(vec[0], vec[1]);

  2013.     const float x = vec[0] * c / s->iflat_range[0] * s->input_mirror_modifier[0];

  2014.     const float y = vec[1] * c / s->iflat_range[1] * s->input_mirror_modifier[1];

  2015. 

  2016.     const float uf = (x + 1.f) * width  / 2.f;

  2017.     const float vf = (y + 1.f) * height / 2.f;

  2018. 

  2019.     const int ui = floorf(uf);

  2020.     const int vi = floorf(vf);

  2021. 

  2022.     const int visible = vec[2] >= 0.f && isfinite(x) && isfinite(y) && vi >= 0 && vi < height && ui >= 0 && ui < width;

  2023. 

  2024.     *du = visible ? uf - ui : 0.f;

  2025.     *dv = visible ? vf - vi : 0.f;

  2026. 

  2027.     for (int i = 0; i < 4; i++) {

  2028.         for (int j = 0; j < 4; j++) {

  2029.             us[i][j] = visible ? av_clip(ui + j - 1, 0, width  - 1) : 0;

  2030.             vs[i][j] = visible ? av_clip(vi + i - 1, 0, height - 1) : 0;

  2031.         }

  2032.     }

  2033. 

  2034.     return visible;

  2035. }

  2036. 

  2037. /**

  2038.  * Calculate frame position in equirectangular format for corresponding 3D coordinates on sphere.

  2039.  *

  2040.  * @param s filter private context

  2041.  * @param vec coordinates on sphere

  2042.  * @param width frame width

  2043.  * @param height frame height

  2044.  * @param us horizontal coordinates for interpolation window

  2045.  * @param vs vertical coordinates for interpolation window

  2046.  * @param du horizontal relative coordinate

  2047.  * @param dv vertical relative coordinate

  2048.  */

  2049. static int xyz_to_equirect(const V360Context *s,

  2050.                            const float *vec, int width, int height,

  2051.                            int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)

  2052. {

  2053.     const float phi   = atan2f(vec[0], vec[2]) * s->input_mirror_modifier[0];

  2054.     const float theta = asinf(vec[1]) * s->input_mirror_modifier[1];

  2055. 

  2056.     const float uf = (phi   / M_PI   + 1.f) * width  / 2.f;

  2057.     const float vf = (theta / M_PI_2 + 1.f) * height / 2.f;

  2058. 

  2059.     const int ui = floorf(uf);

  2060.     const int vi = floorf(vf);

  2061. 

  2062.     *du = uf - ui;

  2063.     *dv = vf - vi;

  2064. 

  2065.     for (int i = 0; i < 4; i++) {

  2066.         for (int j = 0; j < 4; j++) {

  2067.             us[i][j] = ereflectx(ui + j - 1, vi + i - 1, width, height);

  2068.             vs[i][j] = reflecty(vi + i - 1, height);

  2069.         }

  2070.     }

  2071. 

  2072.     return 1;

  2073. }

  2074. 

  2075. /**

  2076.  * Calculate frame position in half equirectangular format for corresponding 3D coordinates on sphere.

  2077.  *

  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

  2086.  */

  2087. static int xyz_to_hequirect(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)

  2090. {

  2091.     const float phi   = atan2f(vec[0], vec[2]) * s->input_mirror_modifier[0];

  2092.     const float theta = asinf(vec[1]) * s->input_mirror_modifier[1];

  2093. 

  2094.     const float uf = (phi   / M_PI_2 + 1.f) * width  / 2.f;

  2095.     const float vf = (theta / M_PI_2 + 1.f) * height / 2.f;

  2096. 

  2097.     const int ui = floorf(uf);

  2098.     const int vi = floorf(vf);

  2099. 

  2100.     const int visible = phi >= -M_PI_2 && phi <= M_PI_2;

  2101. 

  2102.     *du = uf - ui;

  2103.     *dv = vf - vi;

  2104. 

  2105.     for (int i = 0; i < 4; i++) {

  2106.         for (int j = 0; j < 4; j++) {

  2107.             us[i][j] = av_clip(ui + j - 1, 0, width  - 1);

  2108.             vs[i][j] = av_clip(vi + i - 1, 0, height - 1);

  2109.         }

  2110.     }

  2111. 

  2112.     return visible;

  2113. }

  2114. 

  2115. /**

  2116.  * Prepare data for processing flat input format.

  2117.  *

  2118.  * @param ctx filter context

  2119.  *

  2120.  * @return error code

  2121.  */

  2122. static int prepare_flat_in(AVFilterContext *ctx)

  2123. {

  2124.     V360Context *s = ctx->priv;

  2125. 

  2126.     s->iflat_range[0] = tanf(0.5f * s->ih_fov * M_PI / 180.f);

  2127.     s->iflat_range[1] = tanf(0.5f * s->iv_fov * M_PI / 180.f);

  2128. 

  2129.     return 0;

  2130. }

  2131. 

  2132. /**

  2133.  * Calculate frame position in flat format for corresponding 3D coordinates on sphere.

  2134.  *

  2135.  * @param s filter private context

  2136.  * @param vec coordinates on sphere

  2137.  * @param width frame width

  2138.  * @param height frame height

  2139.  * @param us horizontal coordinates for interpolation window

  2140.  * @param vs vertical coordinates for interpolation window

  2141.  * @param du horizontal relative coordinate

  2142.  * @param dv vertical relative coordinate

  2143.  */

  2144. static int xyz_to_flat(const V360Context *s,

  2145.                        const float *vec, int width, int height,

  2146.                        int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)

  2147. {

  2148.     const float theta = acosf(vec[2]);

  2149.     const float r = tanf(theta);

  2150.     const float rr = fabsf(r) < 1e+6f ? r : hypotf(width, height);

  2151.     const float zf = vec[2];

  2152.     const float h = hypotf(vec[0], vec[1]);

  2153.     const float c = h <= 1e-6f ? 1.f : rr / h;

  2154.     float uf = vec[0] * c / s->iflat_range[0] * s->input_mirror_modifier[0];

  2155.     float vf = vec[1] * c / s->iflat_range[1] * s->input_mirror_modifier[1];

  2156.     int visible, ui, vi;

  2157. 

  2158.     uf = zf >= 0.f ? (uf + 1.f) * width  / 2.f : 0.f;

  2159.     vf = zf >= 0.f ? (vf + 1.f) * height / 2.f : 0.f;

  2160. 

  2161.     ui = floorf(uf);

  2162.     vi = floorf(vf);

  2163. 

  2164.     visible = vi >= 0 && vi < height && ui >= 0 && ui < width && zf >= 0.f;

  2165. 

  2166.     *du = uf - ui;

  2167.     *dv = vf - vi;

  2168. 

  2169.     for (int i = 0; i < 4; i++) {

  2170.         for (int j = 0; j < 4; j++) {

  2171.             us[i][j] = visible ? av_clip(ui + j - 1, 0, width  - 1) : 0;

  2172.             vs[i][j] = visible ? av_clip(vi + i - 1, 0, height - 1) : 0;

  2173.         }

  2174.     }

  2175. 

  2176.     return visible;

  2177. }

  2178. 

  2179. /**

  2180.  * Calculate frame position in mercator format for corresponding 3D coordinates on sphere.

  2181.  *

  2182.  * @param s filter private context

  2183.  * @param vec coordinates on sphere

  2184.  * @param width frame width

  2185.  * @param height frame height

  2186.  * @param us horizontal coordinates for interpolation window

  2187.  * @param vs vertical coordinates for interpolation window

  2188.  * @param du horizontal relative coordinate

  2189.  * @param dv vertical relative coordinate

  2190.  */

  2191. static int xyz_to_mercator(const V360Context *s,

  2192.                            const float *vec, int width, int height,

  2193.                            int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)

  2194. {

  2195.     const float phi   = atan2f(vec[0], vec[2]) * s->input_mirror_modifier[0];

  2196.     const float theta = vec[1] * s->input_mirror_modifier[1];

  2197. 

  2198.     const float uf = (phi / M_PI + 1.f) * width / 2.f;

  2199.     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;

  2200. 

  2201.     const int ui = floorf(uf);

  2202.     const int vi = floorf(vf);

  2203. 

  2204.     *du = uf - ui;

  2205.     *dv = vf - vi;

  2206. 

  2207.     for (int i = 0; i < 4; i++) {

  2208.         for (int j = 0; j < 4; j++) {

  2209.             us[i][j] = av_clip(ui + j - 1, 0, width  - 1);

  2210.             vs[i][j] = av_clip(vi + i - 1, 0, height - 1);

  2211.         }

  2212.     }

  2213. 

  2214.     return 1;

  2215. }

  2216. 

  2217. /**

  2218.  * Calculate 3D coordinates on sphere for corresponding frame position in mercator format.

  2219.  *

  2220.  * @param s filter private context

  2221.  * @param i horizontal position on frame [0, width)

  2222.  * @param j vertical position on frame [0, height)

  2223.  * @param width frame width

  2224.  * @param height frame height

  2225.  * @param vec coordinates on sphere

  2226.  */

  2227. static int mercator_to_xyz(const V360Context *s,

  2228.                            int i, int j, int width, int height,

  2229.                            float *vec)

  2230. {

  2231.     const float phi = ((2.f * i + 1.f) / width  - 1.f) * M_PI + M_PI_2;

  2232.     const float y   = ((2.f * j + 1.f) / height - 1.f) * M_PI;

  2233.     const float div = expf(2.f * y) + 1.f;

  2234. 

  2235.     const float sin_phi   = sinf(phi);

  2236.     const float cos_phi   = cosf(phi);

  2237.     const float sin_theta = 2.f * expf(y) / div;

  2238.     const float cos_theta = (expf(2.f * y) - 1.f) / div;

  2239. 

  2240.     vec[0] = -sin_theta * cos_phi;

  2241.     vec[1] =  cos_theta;

  2242.     vec[2] =  sin_theta * sin_phi;

  2243. 

  2244.     return 1;

  2245. }

  2246. 

  2247. /**

  2248.  * Calculate frame position in ball format for corresponding 3D coordinates on sphere.

  2249.  *

  2250.  * @param s filter private context

  2251.  * @param vec coordinates on sphere

  2252.  * @param width frame width

  2253.  * @param height frame height

  2254.  * @param us horizontal coordinates for interpolation window

  2255.  * @param vs vertical coordinates for interpolation window

  2256.  * @param du horizontal relative coordinate

  2257.  * @param dv vertical relative coordinate

  2258.  */

  2259. static int xyz_to_ball(const V360Context *s,

  2260.                        const float *vec, int width, int height,

  2261.                        int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)

  2262. {

  2263.     const float l = hypotf(vec[0], vec[1]);

  2264.     const float r = sqrtf(1.f - vec[2]) / M_SQRT2;

  2265. 

  2266.     const float uf = (1.f + r * vec[0] * s->input_mirror_modifier[0] / (l > 0.f ? l : 1.f)) * width  * 0.5f;

  2267.     const float vf = (1.f + r * vec[1] * s->input_mirror_modifier[1] / (l > 0.f ? l : 1.f)) * height * 0.5f;

  2268. 

  2269.     const int ui = floorf(uf);

  2270.     const int vi = floorf(vf);

  2271. 

  2272.     *du = uf - ui;

  2273.     *dv = vf - vi;

  2274. 

  2275.     for (int i = 0; i < 4; i++) {

  2276.         for (int j = 0; j < 4; j++) {

  2277.             us[i][j] = av_clip(ui + j - 1, 0, width  - 1);

  2278.             vs[i][j] = av_clip(vi + i - 1, 0, height - 1);

  2279.         }

  2280.     }

  2281. 

  2282.     return 1;

  2283. }

  2284. 

  2285. /**

  2286.  * Calculate 3D coordinates on sphere for corresponding frame position in ball format.

  2287.  *

  2288.  * @param s filter private context

  2289.  * @param i horizontal position on frame [0, width)

  2290.  * @param j vertical position on frame [0, height)

  2291.  * @param width frame width

  2292.  * @param height frame height

  2293.  * @param vec coordinates on sphere

  2294.  */

  2295. static int ball_to_xyz(const V360Context *s,

  2296.                        int i, int j, int width, int height,

  2297.                        float *vec)

  2298. {

  2299.     const float x = (2.f * i + 1.f) / width  - 1.f;

  2300.     const float y = (2.f * j + 1.f) / height - 1.f;

  2301.     const float l = hypotf(x, y);

  2302. 

  2303.     if (l <= 1.f) {

  2304.         const float z = 2.f * l * sqrtf(1.f - l * l);

  2305. 

  2306.         vec[0] = z * x / (l > 0.f ? l : 1.f);

  2307.         vec[1] = z * y / (l > 0.f ? l : 1.f);

  2308.         vec[2] = 1.f - 2.f * l * l;

  2309.     } else {

  2310.         vec[0] = 0.f;

  2311.         vec[1] = 1.f;

  2312.         vec[2] = 0.f;

  2313.         return 0;

  2314.     }

  2315. 

  2316.     return 1;

  2317. }

  2318. 

  2319. /**

  2320.  * Calculate 3D coordinates on sphere for corresponding frame position in hammer format.

  2321.  *

  2322.  * @param s filter private context

  2323.  * @param i horizontal position on frame [0, width)

  2324.  * @param j vertical position on frame [0, height)

  2325.  * @param width frame width

  2326.  * @param height frame height

  2327.  * @param vec coordinates on sphere

  2328.  */

  2329. static int hammer_to_xyz(const V360Context *s,

  2330.                          int i, int j, int width, int height,

  2331.                          float *vec)

  2332. {

  2333.     const float x = ((2.f * i + 1.f) / width  - 1.f);

  2334.     const float y = ((2.f * j + 1.f) / height - 1.f);

  2335. 

  2336.     const float xx = x * x;

  2337.     const float yy = y * y;

  2338. 

  2339.     const float z = sqrtf(1.f - xx * 0.5f - yy * 0.5f);

  2340. 

  2341.     const float a = M_SQRT2 * x * z;

  2342.     const float b = 2.f * z * z - 1.f;

  2343. 

  2344.     const float aa = a * a;

  2345.     const float bb = b * b;

  2346. 

  2347.     const float w = sqrtf(1.f - 2.f * yy * z * z);

  2348. 

  2349.     vec[0] = w * 2.f * a * b / (aa + bb);

  2350.     vec[1] = M_SQRT2 * y * z;

  2351.     vec[2] = w * (bb  - aa) / (aa + bb);

  2352. 

  2353.     normalize_vector(vec);

  2354. 

  2355.     return 1;

  2356. }

  2357. 

  2358. /**

  2359.  * Calculate frame position in hammer format for corresponding 3D coordinates on sphere.

  2360.  *

  2361.  * @param s filter private context

  2362.  * @param vec coordinates on sphere

  2363.  * @param width frame width

  2364.  * @param height frame height

  2365.  * @param us horizontal coordinates for interpolation window

  2366.  * @param vs vertical coordinates for interpolation window

  2367.  * @param du horizontal relative coordinate

  2368.  * @param dv vertical relative coordinate

  2369.  */

  2370. static int xyz_to_hammer(const V360Context *s,

  2371.                          const float *vec, int width, int height,

  2372.                          int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)

  2373. {

  2374.     const float theta = atan2f(vec[0], vec[2]) * s->input_mirror_modifier[0];

  2375. 

  2376.     const float z = sqrtf(1.f + sqrtf(1.f - vec[1] * vec[1]) * cosf(theta * 0.5f));

  2377.     const float x = sqrtf(1.f - vec[1] * vec[1]) * sinf(theta * 0.5f) / z;

  2378.     const float y = vec[1] / z * s->input_mirror_modifier[1];

  2379. 

  2380.     const float uf = (x + 1.f) * width  / 2.f;

  2381.     const float vf = (y + 1.f) * height / 2.f;

  2382. 

  2383.     const int ui = floorf(uf);

  2384.     const int vi = floorf(vf);

  2385. 

  2386.     *du = uf - ui;

  2387.     *dv = vf - vi;

  2388. 

  2389.     for (int i = 0; i < 4; i++) {

  2390.         for (int j = 0; j < 4; j++) {

  2391.             us[i][j] = av_clip(ui + j - 1, 0, width  - 1);

  2392.             vs[i][j] = av_clip(vi + i - 1, 0, height - 1);

  2393.         }

  2394.     }

  2395. 

  2396.     return 1;

  2397. }

  2398. 

  2399. /**

  2400.  * Calculate 3D coordinates on sphere for corresponding frame position in sinusoidal format.

  2401.  *

  2402.  * @param s filter private context

  2403.  * @param i horizontal position on frame [0, width)

  2404.  * @param j vertical position on frame [0, height)

  2405.  * @param width frame width

  2406.  * @param height frame height

  2407.  * @param vec coordinates on sphere

  2408.  */

  2409. static int sinusoidal_to_xyz(const V360Context *s,

  2410.                              int i, int j, int width, int height,

  2411.                              float *vec)

  2412. {

  2413.     const float theta = ((2.f * j + 1.f) / height - 1.f) * M_PI_2;

  2414.     const float phi   = ((2.f * i + 1.f) / width  - 1.f) * M_PI / cosf(theta);

  2415. 

  2416.     const float sin_phi   = sinf(phi);

  2417.     const float cos_phi   = cosf(phi);

  2418.     const float sin_theta = sinf(theta);

  2419.     const float cos_theta = cosf(theta);

  2420. 

  2421.     vec[0] = cos_theta * sin_phi;

  2422.     vec[1] = sin_theta;

  2423.     vec[2] = cos_theta * cos_phi;

  2424. 

  2425.     normalize_vector(vec);

  2426. 

  2427.     return 1;

  2428. }

  2429. 

  2430. /**

  2431.  * Calculate frame position in sinusoidal format for corresponding 3D coordinates on sphere.

  2432.  *

  2433.  * @param s filter private context

  2434.  * @param vec coordinates on sphere

  2435.  * @param width frame width

  2436.  * @param height frame height

  2437.  * @param us horizontal coordinates for interpolation window

  2438.  * @param vs vertical coordinates for interpolation window

  2439.  * @param du horizontal relative coordinate

  2440.  * @param dv vertical relative coordinate

  2441.  */

  2442. static int xyz_to_sinusoidal(const V360Context *s,

  2443.                              const float *vec, int width, int height,

  2444.                              int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)

  2445. {

  2446.     const float theta = asinf(vec[1]) * s->input_mirror_modifier[1];

  2447.     const float phi   = atan2f(vec[0], vec[2]) * s->input_mirror_modifier[0] * cosf(theta);

  2448. 

  2449.     const float uf = (phi   / M_PI   + 1.f) * width  / 2.f;

  2450.     const float vf = (theta / M_PI_2 + 1.f) * height / 2.f;

  2451. 

  2452.     const int ui = floorf(uf);

  2453.     const int vi = floorf(vf);

  2454. 

  2455.     *du = uf - ui;

  2456.     *dv = vf - vi;

  2457. 

  2458.     for (int i = 0; i < 4; i++) {

  2459.         for (int j = 0; j < 4; j++) {

  2460.             us[i][j] = av_clip(ui + j - 1, 0, width  - 1);

  2461.             vs[i][j] = av_clip(vi + i - 1, 0, height - 1);

  2462.         }

  2463.     }

  2464. 

  2465.     return 1;

  2466. }

  2467. 

  2468. /**

  2469.  * Prepare data for processing equi-angular cubemap input format.

  2470.  *

  2471.  * @param ctx filter context

  2472.  *

  2473.  * @return error code

  2474.  */

  2475. static int prepare_eac_in(AVFilterContext *ctx)

  2476. {

  2477.     V360Context *s = ctx->priv;

  2478. 

  2479.     if (s->ih_flip && s->iv_flip) {

  2480.         s->in_cubemap_face_order[RIGHT] = BOTTOM_LEFT;

  2481.         s->in_cubemap_face_order[LEFT]  = BOTTOM_RIGHT;

  2482.         s->in_cubemap_face_order[UP]    = TOP_LEFT;

  2483.         s->in_cubemap_face_order[DOWN]  = TOP_RIGHT;

  2484.         s->in_cubemap_face_order[FRONT] = BOTTOM_MIDDLE;

  2485.         s->in_cubemap_face_order[BACK]  = TOP_MIDDLE;

  2486.     } else if (s->ih_flip) {

  2487.         s->in_cubemap_face_order[RIGHT] = TOP_LEFT;

  2488.         s->in_cubemap_face_order[LEFT]  = TOP_RIGHT;

  2489.         s->in_cubemap_face_order[UP]    = BOTTOM_LEFT;

  2490.         s->in_cubemap_face_order[DOWN]  = BOTTOM_RIGHT;

  2491.         s->in_cubemap_face_order[FRONT] = TOP_MIDDLE;

  2492.         s->in_cubemap_face_order[BACK]  = BOTTOM_MIDDLE;

  2493.     } else if (s->iv_flip) {

  2494.         s->in_cubemap_face_order[RIGHT] = BOTTOM_RIGHT;

  2495.         s->in_cubemap_face_order[LEFT]  = BOTTOM_LEFT;

  2496.         s->in_cubemap_face_order[UP]    = TOP_RIGHT;

  2497.         s->in_cubemap_face_order[DOWN]  = TOP_LEFT;

  2498.         s->in_cubemap_face_order[FRONT] = BOTTOM_MIDDLE;

  2499.         s->in_cubemap_face_order[BACK]  = TOP_MIDDLE;

  2500.     } else {

  2501.         s->in_cubemap_face_order[RIGHT] = TOP_RIGHT;

  2502.         s->in_cubemap_face_order[LEFT]  = TOP_LEFT;

  2503.         s->in_cubemap_face_order[UP]    = BOTTOM_RIGHT;

  2504.         s->in_cubemap_face_order[DOWN]  = BOTTOM_LEFT;

  2505.         s->in_cubemap_face_order[FRONT] = TOP_MIDDLE;

  2506.         s->in_cubemap_face_order[BACK]  = BOTTOM_MIDDLE;

  2507.     }

  2508. 

  2509.     if (s->iv_flip) {

  2510.         s->in_cubemap_face_rotation[TOP_LEFT]      = ROT_270;

  2511.         s->in_cubemap_face_rotation[TOP_MIDDLE]    = ROT_90;

  2512.         s->in_cubemap_face_rotation[TOP_RIGHT]     = ROT_270;

  2513.         s->in_cubemap_face_rotation[BOTTOM_LEFT]   = ROT_0;

  2514.         s->in_cubemap_face_rotation[BOTTOM_MIDDLE] = ROT_0;

  2515.         s->in_cubemap_face_rotation[BOTTOM_RIGHT]  = ROT_0;

  2516.     } else {

  2517.         s->in_cubemap_face_rotation[TOP_LEFT]      = ROT_0;

  2518.         s->in_cubemap_face_rotation[TOP_MIDDLE]    = ROT_0;

  2519.         s->in_cubemap_face_rotation[TOP_RIGHT]     = ROT_0;

  2520.         s->in_cubemap_face_rotation[BOTTOM_LEFT]   = ROT_270;

  2521.         s->in_cubemap_face_rotation[BOTTOM_MIDDLE] = ROT_90;

  2522.         s->in_cubemap_face_rotation[BOTTOM_RIGHT]  = ROT_270;

  2523.     }

  2524. 

  2525.     return 0;

  2526. }

  2527. 

  2528. /**

  2529.  * Prepare data for processing equi-angular cubemap output format.

  2530.  *

  2531.  * @param ctx filter context

  2532.  *

  2533.  * @return error code

  2534.  */

  2535. static int prepare_eac_out(AVFilterContext *ctx)

  2536. {

  2537.     V360Context *s = ctx->priv;

  2538. 

  2539.     s->out_cubemap_direction_order[TOP_LEFT]      = LEFT;

  2540.     s->out_cubemap_direction_order[TOP_MIDDLE]    = FRONT;

  2541.     s->out_cubemap_direction_order[TOP_RIGHT]     = RIGHT;

  2542.     s->out_cubemap_direction_order[BOTTOM_LEFT]   = DOWN;

  2543.     s->out_cubemap_direction_order[BOTTOM_MIDDLE] = BACK;

  2544.     s->out_cubemap_direction_order[BOTTOM_RIGHT]  = UP;

  2545. 

  2546.     s->out_cubemap_face_rotation[TOP_LEFT]      = ROT_0;

  2547.     s->out_cubemap_face_rotation[TOP_MIDDLE]    = ROT_0;

  2548.     s->out_cubemap_face_rotation[TOP_RIGHT]     = ROT_0;

  2549.     s->out_cubemap_face_rotation[BOTTOM_LEFT]   = ROT_270;

  2550.     s->out_cubemap_face_rotation[BOTTOM_MIDDLE] = ROT_90;

  2551.     s->out_cubemap_face_rotation[BOTTOM_RIGHT]  = ROT_270;

  2552. 

  2553.     return 0;

  2554. }

  2555. 

  2556. /**

  2557.  * Calculate 3D coordinates on sphere for corresponding frame position in equi-angular cubemap format.

  2558.  *

  2559.  * @param s filter private context

  2560.  * @param i horizontal position on frame [0, width)

  2561.  * @param j vertical position on frame [0, height)

  2562.  * @param width frame width

  2563.  * @param height frame height

  2564.  * @param vec coordinates on sphere

  2565.  */

  2566. static int eac_to_xyz(const V360Context *s,

  2567.                       int i, int j, int width, int height,

  2568.                       float *vec)

  2569. {

  2570.     const float pixel_pad = 2;

  2571.     const float u_pad = pixel_pad / width;

  2572.     const float v_pad = pixel_pad / height;

  2573. 

  2574.     int u_face, v_face, face;

  2575. 

  2576.     float l_x, l_y, l_z;

  2577. 

  2578.     float uf = (i + 0.5f) / width;

  2579.     float vf = (j + 0.5f) / height;

  2580. 

  2581.     // EAC has 2-pixel padding on faces except between faces on the same row

  2582.     // Padding pixels seems not to be stretched with tangent as regular pixels

  2583.     // Formulas below approximate original padding as close as I could get experimentally

  2584. 

  2585.     // Horizontal padding

  2586.     uf = 3.f * (uf - u_pad) / (1.f - 2.f * u_pad);

  2587.     if (uf < 0.f) {

  2588.         u_face = 0;

  2589.         uf -= 0.5f;

  2590.     } else if (uf >= 3.f) {

  2591.         u_face = 2;

  2592.         uf -= 2.5f;

  2593.     } else {

  2594.         u_face = floorf(uf);

  2595.         uf = fmodf(uf, 1.f) - 0.5f;

  2596.     }

  2597. 

  2598.     // Vertical padding

  2599.     v_face = floorf(vf * 2.f);

  2600.     vf = (vf - v_pad - 0.5f * v_face) / (0.5f - 2.f * v_pad) - 0.5f;

  2601. 

  2602.     if (uf >= -0.5f && uf < 0.5f) {

  2603.         uf = tanf(M_PI_2 * uf);

  2604.     } else {

  2605.         uf = 2.f * uf;

  2606.     }

  2607.     if (vf >= -0.5f && vf < 0.5f) {

  2608.         vf = tanf(M_PI_2 * vf);

  2609.     } else {

  2610.         vf = 2.f * vf;

  2611.     }

  2612. 

  2613.     face = u_face + 3 * v_face;

  2614. 

  2615.     switch (face) {

  2616.     case TOP_LEFT:

  2617.         l_x = -1.f;

  2618.         l_y =  vf;

  2619.         l_z =  uf;

  2620.         break;

  2621.     case TOP_MIDDLE:

  2622.         l_x =  uf;

  2623.         l_y =  vf;

  2624.         l_z =  1.f;

  2625.         break;

  2626.     case TOP_RIGHT:

  2627.         l_x =  1.f;

  2628.         l_y =  vf;

  2629.         l_z = -uf;

  2630.         break;

  2631.     case BOTTOM_LEFT:

  2632.         l_x = -vf;

  2633.         l_y =  1.f;

  2634.         l_z = -uf;

  2635.         break;

  2636.     case BOTTOM_MIDDLE:

  2637.         l_x = -vf;

  2638.         l_y = -uf;

  2639.         l_z = -1.f;

  2640.         break;

  2641.     case BOTTOM_RIGHT:

  2642.         l_x = -vf;

  2643.         l_y = -1.f;

  2644.         l_z =  uf;

  2645.         break;

  2646.     default:

  2647.         av_assert0(0);

  2648.     }

  2649. 

  2650.     vec[0] = l_x;

  2651.     vec[1] = l_y;

  2652.     vec[2] = l_z;

  2653. 

  2654.     normalize_vector(vec);

  2655. 

  2656.     return 1;

  2657. }

  2658. 

  2659. /**

  2660.  * Calculate frame position in equi-angular cubemap format for corresponding 3D coordinates on sphere.

  2661.  *

  2662.  * @param s filter private context

  2663.  * @param vec coordinates on sphere

  2664.  * @param width frame width

  2665.  * @param height frame height

  2666.  * @param us horizontal coordinates for interpolation window

  2667.  * @param vs vertical coordinates for interpolation window

  2668.  * @param du horizontal relative coordinate

  2669.  * @param dv vertical relative coordinate

  2670.  */

  2671. static int xyz_to_eac(const V360Context *s,

  2672.                       const float *vec, int width, int height,

  2673.                       int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)

  2674. {

  2675.     const float pixel_pad = 2;

  2676.     const float u_pad = pixel_pad / width;

  2677.     const float v_pad = pixel_pad / height;

  2678. 

  2679.     float uf, vf;

  2680.     int ui, vi;

  2681.     int direction, face;

  2682.     int u_face, v_face;

  2683. 

  2684.     xyz_to_cube(s, vec, &uf, &vf, &direction);

  2685. 

  2686.     face = s->in_cubemap_face_order[direction];

  2687.     u_face = face % 3;

  2688.     v_face = face / 3;

  2689. 

  2690.     uf = M_2_PI * atanf(uf) + 0.5f;

  2691.     vf = M_2_PI * atanf(vf) + 0.5f;

  2692. 

  2693.     // These formulas are inversed from eac_to_xyz ones

  2694.     uf = (uf + u_face) * (1.f - 2.f * u_pad) / 3.f + u_pad;

  2695.     vf = vf * (0.5f - 2.f * v_pad) + v_pad + 0.5f * v_face;

  2696. 

  2697.     uf *= width;

  2698.     vf *= height;

  2699. 

  2700.     uf -= 0.5f;

  2701.     vf -= 0.5f;

  2702. 

  2703.     ui = floorf(uf);

  2704.     vi = floorf(vf);

  2705. 

  2706.     *du = uf - ui;

  2707.     *dv = vf - vi;

  2708. 

  2709.     for (int i = 0; i < 4; i++) {

  2710.         for (int j = 0; j < 4; j++) {

  2711.             us[i][j] = av_clip(ui + j - 1, 0, width  - 1);

  2712.             vs[i][j] = av_clip(vi + i - 1, 0, height - 1);

  2713.         }

  2714.     }

  2715. 

  2716.     return 1;

  2717. }

  2718. 

  2719. /**

  2720.  * Prepare data for processing flat output format.

  2721.  *

  2722.  * @param ctx filter context

  2723.  *

  2724.  * @return error code

  2725.  */

  2726. static int prepare_flat_out(AVFilterContext *ctx)

  2727. {

  2728.     V360Context *s = ctx->priv;

  2729. 

  2730.     s->flat_range[0] = tanf(0.5f * s->h_fov * M_PI / 180.f);

  2731.     s->flat_range[1] = tanf(0.5f * s->v_fov * M_PI / 180.f);

  2732. 

  2733.     return 0;

  2734. }

  2735. 

  2736. /**

  2737.  * Calculate 3D coordinates on sphere for corresponding frame position in flat format.

  2738.  *

  2739.  * @param s filter private context

  2740.  * @param i horizontal position on frame [0, width)

  2741.  * @param j vertical position on frame [0, height)

  2742.  * @param width frame width

  2743.  * @param height frame height

  2744.  * @param vec coordinates on sphere

  2745.  */

  2746. static int flat_to_xyz(const V360Context *s,

  2747.                        int i, int j, int width, int height,

  2748.                        float *vec)

  2749. {

  2750.     const float l_x = s->flat_range[0] * ((2.f * i + 0.5f) / width  - 1.f);

  2751.     const float l_y = s->flat_range[1] * ((2.f * j + 0.5f) / height - 1.f);

  2752. 

  2753.     vec[0] = l_x;

  2754.     vec[1] = l_y;

  2755.     vec[2] = 1.f;

  2756. 

  2757.     normalize_vector(vec);

  2758. 

  2759.     return 1;

  2760. }

  2761. 

  2762. /**

  2763.  * Prepare data for processing fisheye output format.

  2764.  *

  2765.  * @param ctx filter context

  2766.  *

  2767.  * @return error code

  2768.  */

  2769. static int prepare_fisheye_out(AVFilterContext *ctx)

  2770. {

  2771.     V360Context *s = ctx->priv;

  2772. 

  2773.     s->flat_range[0] = s->h_fov / 180.f;

  2774.     s->flat_range[1] = s->v_fov / 180.f;

  2775. 

  2776.     return 0;

  2777. }

  2778. 

  2779. /**

  2780.  * Calculate 3D coordinates on sphere for corresponding frame position in fisheye format.

  2781.  *

  2782.  * @param s filter private context

  2783.  * @param i horizontal position on frame [0, width)

  2784.  * @param j vertical position on frame [0, height)

  2785.  * @param width frame width

  2786.  * @param height frame height

  2787.  * @param vec coordinates on sphere

  2788.  */

  2789. static int fisheye_to_xyz(const V360Context *s,

  2790.                           int i, int j, int width, int height,

  2791.                           float *vec)

  2792. {

  2793.     const float uf = s->flat_range[0] * ((2.f * i) / width  - 1.f);

  2794.     const float vf = s->flat_range[1] * ((2.f * j + 1.f) / height - 1.f);

  2795. 

  2796.     const float phi   = atan2f(vf, uf);

  2797.     const float theta = M_PI_2 * (1.f - hypotf(uf, vf));

  2798. 

  2799.     const float sin_phi   = sinf(phi);

  2800.     const float cos_phi   = cosf(phi);

  2801.     const float sin_theta = sinf(theta);

  2802.     const float cos_theta = cosf(theta);

  2803. 

  2804.     vec[0] = cos_theta * cos_phi;

  2805.     vec[1] = cos_theta * sin_phi;

  2806.     vec[2] = sin_theta;

  2807. 

  2808.     normalize_vector(vec);

  2809. 

  2810.     return 1;

  2811. }

  2812. 

  2813. /**

  2814.  * Prepare data for processing fisheye input format.

  2815.  *

  2816.  * @param ctx filter context

  2817.  *

  2818.  * @return error code

  2819.  */

  2820. static int prepare_fisheye_in(AVFilterContext *ctx)

  2821. {

  2822.     V360Context *s = ctx->priv;

  2823. 

  2824.     s->iflat_range[0] = s->ih_fov / 180.f;

  2825.     s->iflat_range[1] = s->iv_fov / 180.f;

  2826. 

  2827.     return 0;

  2828. }

  2829. 

  2830. /**

  2831.  * Calculate frame position in fisheye format for corresponding 3D coordinates on sphere.

  2832.  *

  2833.  * @param s filter private context

  2834.  * @param vec coordinates on sphere

  2835.  * @param width frame width

  2836.  * @param height frame height

  2837.  * @param us horizontal coordinates for interpolation window

  2838.  * @param vs vertical coordinates for interpolation window

  2839.  * @param du horizontal relative coordinate

  2840.  * @param dv vertical relative coordinate

  2841.  */

  2842. static int xyz_to_fisheye(const V360Context *s,

  2843.                           const float *vec, int width, int height,

  2844.                           int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)

  2845. {

  2846.     const float h   = hypotf(vec[0], vec[1]);

  2847.     const float lh  = h > 0.f ? h : 1.f;

  2848.     const float phi = atan2f(h, vec[2]) / M_PI;

  2849. 

  2850.     float uf = vec[0] / lh * phi * s->input_mirror_modifier[0] / s->iflat_range[0];

  2851.     float vf = vec[1] / lh * phi * s->input_mirror_modifier[1] / s->iflat_range[1];

  2852. 

  2853.     const int visible = hypotf(uf, vf) <= 0.5f;

  2854.     int ui, vi;

  2855. 

  2856.     uf = (uf + 0.5f) * width;

  2857.     vf = (vf + 0.5f) * height;

  2858. 

  2859.     ui = floorf(uf);

  2860.     vi = floorf(vf);

  2861. 

  2862.     *du = visible ? uf - ui : 0.f;

  2863.     *dv = visible ? vf - vi : 0.f;

  2864. 

  2865.     for (int i = 0; i < 4; i++) {

  2866.         for (int j = 0; j < 4; j++) {

  2867.             us[i][j] = visible ? av_clip(ui + j - 1, 0, width  - 1) : 0;

  2868.             vs[i][j] = visible ? av_clip(vi + i - 1, 0, height - 1) : 0;

  2869.         }

  2870.     }

  2871. 

  2872.     return visible;

  2873. }

  2874. 

  2875. /**

  2876.  * Calculate 3D coordinates on sphere for corresponding frame position in pannini format.

  2877.  *

  2878.  * @param s filter private context

  2879.  * @param i horizontal position on frame [0, width)

  2880.  * @param j vertical position on frame [0, height)

  2881.  * @param width frame width

  2882.  * @param height frame height

  2883.  * @param vec coordinates on sphere

  2884.  */

  2885. static int pannini_to_xyz(const V360Context *s,

  2886.                           int i, int j, int width, int height,

  2887.                           float *vec)

  2888. {

  2889.     const float uf = ((2.f * i + 1.f) / width  - 1.f);

  2890.     const float vf = ((2.f * j + 1.f) / height - 1.f);

  2891. 

  2892.     const float d = s->h_fov;

  2893.     const float k = uf * uf / ((d + 1.f) * (d + 1.f));

  2894.     const float dscr = k * k * d * d - (k + 1.f) * (k * d * d - 1.f);

  2895.     const float clon = (-k * d + sqrtf(dscr)) / (k + 1.f);

  2896.     const float S = (d + 1.f) / (d + clon);

  2897.     const float lon = atan2f(uf, S * clon);

  2898.     const float lat = atan2f(vf, S);

  2899. 

  2900.     vec[0] = sinf(lon) * cosf(lat);

  2901.     vec[1] = sinf(lat);

  2902.     vec[2] = cosf(lon) * cosf(lat);

  2903. 

  2904.     normalize_vector(vec);

  2905. 

  2906.     return 1;

  2907. }

  2908. 

  2909. /**

  2910.  * Calculate frame position in pannini format for corresponding 3D coordinates on sphere.

  2911.  *

  2912.  * @param s filter private context

  2913.  * @param vec coordinates on sphere

  2914.  * @param width frame width

  2915.  * @param height frame height

  2916.  * @param us horizontal coordinates for interpolation window

  2917.  * @param vs vertical coordinates for interpolation window

  2918.  * @param du horizontal relative coordinate

  2919.  * @param dv vertical relative coordinate

  2920.  */

  2921. static int xyz_to_pannini(const V360Context *s,

  2922.                           const float *vec, int width, int height,

  2923.                           int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)

  2924. {

  2925.     const float phi   = atan2f(vec[0], vec[2]) * s->input_mirror_modifier[0];

  2926.     const float theta = asinf(vec[1]) * s->input_mirror_modifier[1];

  2927. 

  2928.     const float d = s->ih_fov;

  2929.     const float S = (d + 1.f) / (d + cosf(phi));

  2930. 

  2931.     const float x = S * sinf(phi);

  2932.     const float y = S * tanf(theta);

  2933. 

  2934.     const float uf = (x + 1.f) * width  / 2.f;

  2935.     const float vf = (y + 1.f) * height / 2.f;

  2936. 

  2937.     const int ui = floorf(uf);

  2938.     const int vi = floorf(vf);

  2939. 

  2940.     const int visible = vi >= 0 && vi < height && ui >= 0 && ui < width && vec[2] >= 0.f;

  2941. 

  2942.     *du = uf - ui;

  2943.     *dv = vf - vi;

  2944. 

  2945.     for (int i = 0; i < 4; i++) {

  2946.         for (int j = 0; j < 4; j++) {

  2947.             us[i][j] = visible ? av_clip(ui + j - 1, 0, width  - 1) : 0;

  2948.             vs[i][j] = visible ? av_clip(vi + i - 1, 0, height - 1) : 0;

  2949.         }

  2950.     }

  2951. 

  2952.     return visible;

  2953. }

  2954. 

  2955. /**

  2956.  * Prepare data for processing cylindrical output format.

  2957.  *

  2958.  * @param ctx filter context

  2959.  *

  2960.  * @return error code

  2961.  */

  2962. static int prepare_cylindrical_out(AVFilterContext *ctx)

  2963. {

  2964.     V360Context *s = ctx->priv;

  2965. 

  2966.     s->flat_range[0] = M_PI * s->h_fov / 360.f;

  2967.     s->flat_range[1] = tanf(0.5f * s->v_fov * M_PI / 180.f);

  2968. 

  2969.     return 0;

  2970. }

  2971. 

  2972. /**

  2973.  * Calculate 3D coordinates on sphere for corresponding frame position in cylindrical format.

  2974.  *

  2975.  * @param s filter private context

  2976.  * @param i horizontal position on frame [0, width)

  2977.  * @param j vertical position on frame [0, height)

  2978.  * @param width frame width

  2979.  * @param height frame height

  2980.  * @param vec coordinates on sphere

  2981.  */

  2982. static int cylindrical_to_xyz(const V360Context *s,

  2983.                               int i, int j, int width, int height,

  2984.                               float *vec)

  2985. {

  2986.     const float uf = s->flat_range[0] * ((2.f * i + 1.f) / width  - 1.f);

  2987.     const float vf = s->flat_range[1] * ((2.f * j + 1.f) / height - 1.f);

  2988. 

  2989.     const float phi   = uf;

  2990.     const float theta = atanf(vf);

  2991. 

  2992.     const float sin_phi   = sinf(phi);

  2993.     const float cos_phi   = cosf(phi);

  2994.     const float sin_theta = sinf(theta);

  2995.     const float cos_theta = cosf(theta);

  2996. 

  2997.     vec[0] = cos_theta * sin_phi;

  2998.     vec[1] = sin_theta;

  2999.     vec[2] = cos_theta * cos_phi;

  3000. 

  3001.     normalize_vector(vec);

  3002. 

  3003.     return 1;

  3004. }

  3005. 

  3006. /**

  3007.  * Prepare data for processing cylindrical input format.

  3008.  *

  3009.  * @param ctx filter context

  3010.  *

  3011.  * @return error code

  3012.  */

  3013. static int prepare_cylindrical_in(AVFilterContext *ctx)

  3014. {

  3015.     V360Context *s = ctx->priv;

  3016. 

  3017.     s->iflat_range[0] = M_PI * s->ih_fov / 360.f;

  3018.     s->iflat_range[1] = tanf(0.5f * s->iv_fov * M_PI / 180.f);

  3019. 

  3020.     return 0;

  3021. }

  3022. 

  3023. /**

  3024.  * Calculate frame position in cylindrical format for corresponding 3D coordinates on sphere.

  3025.  *

  3026.  * @param s filter private context

  3027.  * @param vec coordinates on sphere

  3028.  * @param width frame width

  3029.  * @param height frame height

  3030.  * @param us horizontal coordinates for interpolation window

  3031.  * @param vs vertical coordinates for interpolation window

  3032.  * @param du horizontal relative coordinate

  3033.  * @param dv vertical relative coordinate

  3034.  */

  3035. static int xyz_to_cylindrical(const V360Context *s,

  3036.                               const float *vec, int width, int height,

  3037.                               int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)

  3038. {

  3039.     const float phi   = atan2f(vec[0], vec[2]) * s->input_mirror_modifier[0] / s->iflat_range[0];

  3040.     const float theta = asinf(vec[1]) * s->input_mirror_modifier[1];

  3041. 

  3042.     const float uf = (phi + 1.f) * (width - 1) / 2.f;

  3043.     const float vf = (tanf(theta) / s->iflat_range[1] + 1.f) * height / 2.f;

  3044. 

  3045.     const int ui = floorf(uf);

  3046.     const int vi = floorf(vf);

  3047. 

  3048.     const int visible = vi >= 0 && vi < height && ui >= 0 && ui < width &&

  3049.                         theta <=  M_PI * s->iv_fov / 180.f &&

  3050.                         theta >= -M_PI * s->iv_fov / 180.f;

  3051. 

  3052.     *du = uf - ui;

  3053.     *dv = vf - vi;

  3054. 

  3055.     for (int i = 0; i < 4; i++) {

  3056.         for (int j = 0; j < 4; j++) {

  3057.             us[i][j] = visible ? av_clip(ui + j - 1, 0, width  - 1) : 0;

  3058.             vs[i][j] = visible ? av_clip(vi + i - 1, 0, height - 1) : 0;

  3059.         }

  3060.     }

  3061. 

  3062.     return visible;

  3063. }

  3064. 

  3065. /**

  3066.  * Calculate 3D coordinates on sphere for corresponding frame position in perspective format.

  3067.  *

  3068.  * @param s filter private context

  3069.  * @param i horizontal position on frame [0, width)

  3070.  * @param j vertical position on frame [0, height)

  3071.  * @param width frame width

  3072.  * @param height frame height

  3073.  * @param vec coordinates on sphere

  3074.  */

  3075. static int perspective_to_xyz(const V360Context *s,

  3076.                               int i, int j, int width, int height,

  3077.                               float *vec)

  3078. {

  3079.     const float uf = ((2.f * i + 1.f) / width  - 1.f);

  3080.     const float vf = ((2.f * j + 1.f) / height - 1.f);

  3081.     const float rh = hypotf(uf, vf);

  3082.     const float sinzz = 1.f - rh * rh;

  3083.     const float h = 1.f + s->v_fov;

  3084.     const float sinz = (h - sqrtf(sinzz)) / (h / rh + rh / h);

  3085.     const float sinz2 = sinz * sinz;

  3086. 

  3087.     if (sinz2 <= 1.f) {

  3088.         const float cosz = sqrtf(1.f - sinz2);

  3089. 

  3090.         const float theta = asinf(cosz);

  3091.         const float phi   = atan2f(uf, vf);

  3092. 

  3093.         const float sin_phi   = sinf(phi);

  3094.         const float cos_phi   = cosf(phi);

  3095.         const float sin_theta = sinf(theta);

  3096.         const float cos_theta = cosf(theta);

  3097. 

  3098.         vec[0] = cos_theta * sin_phi;

  3099.         vec[1] = sin_theta;

  3100.         vec[2] = cos_theta * cos_phi;

  3101.     } else {

  3102.         vec[0] = 0.f;

  3103.         vec[1] = 1.f;

  3104.         vec[2] = 0.f;

  3105.         return 0;

  3106.     }

  3107. 

  3108.     normalize_vector(vec);

  3109.     return 1;

  3110. }

  3111. 

  3112. /**

  3113.  * Calculate 3D coordinates on sphere for corresponding frame position in tetrahedron format.

  3114.  *

  3115.  * @param s filter private context

  3116.  * @param i horizontal position on frame [0, width)

  3117.  * @param j vertical position on frame [0, height)

  3118.  * @param width frame width

  3119.  * @param height frame height

  3120.  * @param vec coordinates on sphere

  3121.  */

  3122. static int tetrahedron_to_xyz(const V360Context *s,

  3123.                               int i, int j, int width, int height,

  3124.                               float *vec)

  3125. {

  3126.     const float uf = (float)i / width;

  3127.     const float vf = (float)j / height;

  3128. 

  3129.     vec[0] = uf < 0.5f ? uf * 4.f - 1.f : 3.f - uf * 4.f;

  3130.     vec[1] = 1.f - vf * 2.f;

  3131.     vec[2] = 2.f * fabsf(1.f - fabsf(1.f - uf * 2.f + vf)) - 1.f;

  3132. 

  3133.     normalize_vector(vec);

  3134. 

  3135.     return 1;

  3136. }

  3137. 

  3138. /**

  3139.  * Calculate frame position in tetrahedron format for corresponding 3D coordinates on sphere.

  3140.  *

  3141.  * @param s filter private context

  3142.  * @param vec coordinates on sphere

  3143.  * @param width frame width

  3144.  * @param height frame height

  3145.  * @param us horizontal coordinates for interpolation window

  3146.  * @param vs vertical coordinates for interpolation window

  3147.  * @param du horizontal relative coordinate

  3148.  * @param dv vertical relative coordinate

  3149.  */

  3150. static int xyz_to_tetrahedron(const V360Context *s,

  3151.                               const float *vec, int width, int height,

  3152.                               int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)

  3153. {

  3154.     const float d0 = vec[0] * 1.f + vec[1] * 1.f + vec[2] *-1.f;

  3155.     const float d1 = vec[0] *-1.f + vec[1] *-1.f + vec[2] *-1.f;

  3156.     const float d2 = vec[0] * 1.f + vec[1] *-1.f + vec[2] * 1.f;

  3157.     const float d3 = vec[0] *-1.f + vec[1] * 1.f + vec[2] * 1.f;

  3158.     const float d = FFMAX(d0, FFMAX3(d1, d2, d3));

  3159. 

  3160.     float uf, vf, x, y, z;

  3161.     int ui, vi;

  3162. 

  3163.     x =  vec[0] / d;

  3164.     y =  vec[1] / d;

  3165.     z = -vec[2] / d;

  3166. 

  3167.     vf = 0.5f - y * 0.5f * s->input_mirror_modifier[1];

  3168. 

  3169.     if ((x + y >= 0.f &&  y + z >= 0.f && -z - x <= 0.f) ||

  3170.         (x + y <= 0.f && -y + z >= 0.f &&  z - x >= 0.f)) {

  3171.         uf = 0.25f * x * s->input_mirror_modifier[0] + 0.25f;

  3172.     }  else {

  3173.         uf = 0.75f - 0.25f * x * s->input_mirror_modifier[0];

  3174.     }

  3175. 

  3176.     uf *= width;

  3177.     vf *= height;

  3178. 

  3179.     ui = floorf(uf);

  3180.     vi = floorf(vf);

  3181. 

  3182.     *du = uf - ui;

  3183.     *dv = vf - vi;

  3184. 

  3185.     for (int i = 0; i < 4; i++) {

  3186.         for (int j = 0; j < 4; j++) {

  3187.             us[i][j] = reflectx(ui + j - 1, vi + i - 1, width, height);

  3188.             vs[i][j] = reflecty(vi + i - 1, height);

  3189.         }

  3190.     }

  3191. 

  3192.     return 1;

  3193. }

  3194. 

  3195. /**

  3196.  * Calculate 3D coordinates on sphere for corresponding frame position in dual fisheye format.

  3197.  *

  3198.  * @param s filter private context

  3199.  * @param i horizontal position on frame [0, width)

  3200.  * @param j vertical position on frame [0, height)

  3201.  * @param width frame width

  3202.  * @param height frame height

  3203.  * @param vec coordinates on sphere

  3204.  */

  3205. static int dfisheye_to_xyz(const V360Context *s,

  3206.                            int i, int j, int width, int height,

  3207.                            float *vec)

  3208. {

  3209.     const float ew = width / 2.f;

  3210.     const float eh = height;

  3211. 

  3212.     const int ei = i >= ew ? i - ew : i;

  3213.     const float m = i >= ew ? 1.f : -1.f;

  3214. 

  3215.     const float uf = s->flat_range[0] * ((2.f * ei) / ew - 1.f);

  3216.     const float vf = s->flat_range[1] * ((2.f * j + 1.f) / eh - 1.f);

  3217. 

  3218.     const float h     = hypotf(uf, vf);

  3219.     const float lh    = h > 0.f ? h : 1.f;

  3220.     const float theta = m * M_PI_2 * (1.f - h);

  3221. 

  3222.     const float sin_theta = sinf(theta);

  3223.     const float cos_theta = cosf(theta);

  3224. 

  3225.     vec[0] = cos_theta * m * uf / lh;

  3226.     vec[1] = cos_theta *     vf / lh;

  3227.     vec[2] = sin_theta;

  3228. 

  3229.     normalize_vector(vec);

  3230. 

  3231.     return 1;

  3232. }

  3233. 

  3234. /**

  3235.  * Calculate frame position in dual fisheye format for corresponding 3D coordinates on sphere.

  3236.  *

  3237.  * @param s filter private context

  3238.  * @param vec coordinates on sphere

  3239.  * @param width frame width

  3240.  * @param height frame height

  3241.  * @param us horizontal coordinates for interpolation window

  3242.  * @param vs vertical coordinates for interpolation window

  3243.  * @param du horizontal relative coordinate

  3244.  * @param dv vertical relative coordinate

  3245.  */

  3246. static int xyz_to_dfisheye(const V360Context *s,

  3247.                            const float *vec, int width, int height,

  3248.                            int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)

  3249. {

  3250.     const float ew = width / 2.f;

  3251.     const float eh = height;

  3252. 

  3253.     const float h     = hypotf(vec[0], vec[1]);

  3254.     const float lh    = h > 0.f ? h : 1.f;

  3255.     const float theta = acosf(fabsf(vec[2])) / M_PI;

  3256. 

  3257.     float uf = (theta * (vec[0] / lh) * s->input_mirror_modifier[0] / s->iflat_range[0] + 0.5f) * ew;

  3258.     float vf = (theta * (vec[1] / lh) * s->input_mirror_modifier[1] / s->iflat_range[1] + 0.5f) * eh;

  3259. 

  3260.     int ui, vi;

  3261.     int u_shift;

  3262. 

  3263.     if (vec[2] >= 0.f) {

  3264.         u_shift = ceilf(ew);

  3265.     } else {

  3266.         u_shift = 0;

  3267.         uf = ew - uf;

  3268.     }

  3269. 

  3270.     ui = floorf(uf);

  3271.     vi = floorf(vf);

  3272. 

  3273.     *du = uf - ui;

  3274.     *dv = vf - vi;

  3275. 

  3276.     for (int i = 0; i < 4; i++) {

  3277.         for (int j = 0; j < 4; j++) {

  3278.             us[i][j] = av_clip(u_shift + ui + j - 1, 0, width  - 1);

  3279.             vs[i][j] = av_clip(          vi + i - 1, 0, height - 1);

  3280.         }

  3281.     }

  3282. 

  3283.     return 1;

  3284. }

  3285. 

  3286. /**

  3287.  * Calculate 3D coordinates on sphere for corresponding frame position in barrel facebook's format.

  3288.  *

  3289.  * @param s filter private context

  3290.  * @param i horizontal position on frame [0, width)

  3291.  * @param j vertical position on frame [0, height)

  3292.  * @param width frame width

  3293.  * @param height frame height

  3294.  * @param vec coordinates on sphere

  3295.  */

  3296. static int barrel_to_xyz(const V360Context *s,

  3297.                          int i, int j, int width, int height,

  3298.                          float *vec)

  3299. {

  3300.     const float scale = 0.99f;

  3301.     float l_x, l_y, l_z;

  3302. 

  3303.     if (i < 4 * width / 5) {

  3304.         const float theta_range = M_PI_4;

  3305. 

  3306.         const int ew = 4 * width / 5;

  3307.         const int eh = height;

  3308. 

  3309.         const float phi   = ((2.f * i) / ew - 1.f) * M_PI        / scale;

  3310.         const float theta = ((2.f * j) / eh - 1.f) * theta_range / scale;

  3311. 

  3312.         const float sin_phi   = sinf(phi);

  3313.         const float cos_phi   = cosf(phi);

  3314.         const float sin_theta = sinf(theta);

  3315.         const float cos_theta = cosf(theta);

  3316. 

  3317.         l_x = cos_theta * sin_phi;

  3318.         l_y = sin_theta;

  3319.         l_z = cos_theta * cos_phi;

  3320.     } else {

  3321.         const int ew = width  / 5;

  3322.         const int eh = height / 2;

  3323. 

  3324.         float uf, vf;

  3325. 

  3326.         if (j < eh) {   // UP

  3327.             uf = 2.f * (i - 4 * ew) / ew - 1.f;

  3328.             vf = 2.f * (j         ) / eh - 1.f;

  3329. 

  3330.             uf /= scale;

  3331.             vf /= scale;

  3332. 

  3333.             l_x =  uf;

  3334.             l_y = -1.f;

  3335.             l_z =  vf;

  3336.         } else {            // DOWN

  3337.             uf = 2.f * (i - 4 * ew) / ew - 1.f;

  3338.             vf = 2.f * (j -     eh) / eh - 1.f;

  3339. 

  3340.             uf /= scale;

  3341.             vf /= scale;

  3342. 

  3343.             l_x =  uf;

  3344.             l_y =  1.f;

  3345.             l_z = -vf;

  3346.         }

  3347.     }

  3348. 

  3349.     vec[0] = l_x;

  3350.     vec[1] = l_y;

  3351.     vec[2] = l_z;

  3352. 

  3353.     normalize_vector(vec);

  3354. 

  3355.     return 1;

  3356. }

  3357. 

  3358. /**

  3359.  * Calculate frame position in barrel facebook's format for corresponding 3D coordinates on sphere.

  3360.  *

  3361.  * @param s filter private context

  3362.  * @param vec coordinates on sphere

  3363.  * @param width frame width

  3364.  * @param height frame height

  3365.  * @param us horizontal coordinates for interpolation window

  3366.  * @param vs vertical coordinates for interpolation window

  3367.  * @param du horizontal relative coordinate

  3368.  * @param dv vertical relative coordinate

  3369.  */

  3370. static int xyz_to_barrel(const V360Context *s,

  3371.                          const float *vec, int width, int height,

  3372.                          int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)

  3373. {

  3374.     const float scale = 0.99f;

  3375. 

  3376.     const float phi   = atan2f(vec[0], vec[2]) * s->input_mirror_modifier[0];

  3377.     const float theta = asinf(vec[1]) * s->input_mirror_modifier[1];

  3378.     const float theta_range = M_PI_4;

  3379. 

  3380.     int ew, eh;

  3381.     int u_shift, v_shift;

  3382.     float uf, vf;

  3383.     int ui, vi;

  3384. 

  3385.     if (theta > -theta_range && theta < theta_range) {

  3386.         ew = 4 * width / 5;

  3387.         eh = height;

  3388. 

  3389.         u_shift = s->ih_flip ? width / 5 : 0;

  3390.         v_shift = 0;

  3391. 

  3392.         uf = (phi   / M_PI        * scale + 1.f) * ew / 2.f;

  3393.         vf = (theta / theta_range * scale + 1.f) * eh / 2.f;

  3394.     } else {

  3395.         ew = width  / 5;

  3396.         eh = height / 2;

  3397. 

  3398.         u_shift = s->ih_flip ? 0 : 4 * ew;

  3399. 

  3400.         if (theta < 0.f) {  // UP

  3401.             uf = -vec[0] / vec[1];

  3402.             vf = -vec[2] / vec[1];

  3403.             v_shift = 0;

  3404.         } else {            // DOWN

  3405.             uf =  vec[0] / vec[1];

  3406.             vf = -vec[2] / vec[1];

  3407.             v_shift = eh;

  3408.         }

  3409. 

  3410.         uf *= s->input_mirror_modifier[0] * s->input_mirror_modifier[1];

  3411.         vf *= s->input_mirror_modifier[1];

  3412. 

  3413.         uf = 0.5f * ew * (uf * scale + 1.f);

  3414.         vf = 0.5f * eh * (vf * scale + 1.f);

  3415.     }

  3416. 

  3417.     ui = floorf(uf);

  3418.     vi = floorf(vf);

  3419. 

  3420.     *du = uf - ui;

  3421.     *dv = vf - vi;

  3422. 

  3423.     for (int i = 0; i < 4; i++) {

  3424.         for (int j = 0; j < 4; j++) {

  3425.             us[i][j] = u_shift + av_clip(ui + j - 1, 0, ew - 1);

  3426.             vs[i][j] = v_shift + av_clip(vi + i - 1, 0, eh - 1);

  3427.         }

  3428.     }

  3429. 

  3430.     return 1;

  3431. }

  3432. 

  3433. /**

  3434.  * Calculate frame position in barrel split facebook's format for corresponding 3D coordinates on sphere.

  3435.  *

  3436.  * @param s filter private context

  3437.  * @param vec coordinates on sphere

  3438.  * @param width frame width

  3439.  * @param height frame height

  3440.  * @param us horizontal coordinates for interpolation window

  3441.  * @param vs vertical coordinates for interpolation window

  3442.  * @param du horizontal relative coordinate

  3443.  * @param dv vertical relative coordinate

  3444.  */

  3445. static int xyz_to_barrelsplit(const V360Context *s,

  3446.                               const float *vec, int width, int height,

  3447.                               int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)

  3448. {

  3449.     const float phi   = atan2f(vec[0], vec[2]) * s->input_mirror_modifier[0];

  3450.     const float theta = asinf(vec[1]) * s->input_mirror_modifier[1];

  3451. 

  3452.     const float theta_range = M_PI_4;

  3453. 

  3454.     int ew, eh;

  3455.     int u_shift, v_shift;

  3456.     float uf, vf;

  3457.     int ui, vi;

  3458. 

  3459.     if (theta >= -theta_range && theta <= theta_range) {

  3460.         const float scalew = s->fin_pad > 0 ? 1.f - s->fin_pad / (width * 2.f / 3.f) : 1.f - s->in_pad;

  3461.         const float scaleh = s->fin_pad > 0 ? 1.f - s->fin_pad / (height / 2.f) : 1.f - s->in_pad;

  3462. 

  3463.         ew = width / 3 * 2;

  3464.         eh = height / 2;

  3465. 

  3466.         u_shift = s->ih_flip ? width / 3 : 0;

  3467.         v_shift = phi >= M_PI_2 || phi < -M_PI_2 ? eh : 0;

  3468. 

  3469.         uf = fmodf(phi, M_PI_2) / M_PI_2;

  3470.         vf = theta / M_PI_4;

  3471. 

  3472.         if (v_shift)

  3473.             uf = uf >= 0.f ? fmodf(uf - 1.f, 1.f) : fmodf(uf + 1.f, 1.f);

  3474. 

  3475.         uf = (uf * scalew + 1.f) * width  / 3.f;

  3476.         vf = (vf * scaleh + 1.f) * height / 4.f;

  3477.     } else {

  3478.         const float scalew = s->fin_pad > 0 ? 1.f - s->fin_pad / (width  / 3.f) : 1.f - s->in_pad;

  3479.         const float scaleh = s->fin_pad > 0 ? 1.f - s->fin_pad / (height / 4.f) : 1.f - s->in_pad;

  3480.         int v_offset = 0;

  3481. 

  3482.         ew = width  / 3;

  3483.         eh = height / 4;

  3484. 

  3485.         u_shift = s->ih_flip ? 0 : 2 * ew;

  3486. 

  3487.         if (theta <= 0.f && theta >= -M_PI_2 &&

  3488.             phi <= M_PI_2 && phi >= -M_PI_2) {

  3489.             uf = -vec[0] / vec[1];

  3490.             vf = -vec[2] / vec[1];

  3491.             v_shift = 0;

  3492.             v_offset = -eh;

  3493.         } else if (theta >= 0.f && theta <= M_PI_2 &&

  3494.                    phi <= M_PI_2 && phi >= -M_PI_2) {

  3495.             uf =  vec[0] / vec[1];

  3496.             vf = -vec[2] / vec[1];

  3497.             v_shift = height * 0.25f;

  3498.         } else if (theta <= 0.f && theta >= -M_PI_2) {

  3499.             uf =  vec[0] / vec[1];

  3500.             vf =  vec[2] / vec[1];

  3501.             v_shift = height * 0.5f;

  3502.             v_offset = -eh;

  3503.         } else {

  3504.             uf = -vec[0] / vec[1];

  3505.             vf =  vec[2] / vec[1];

  3506.             v_shift = height * 0.75f;

  3507.         }

  3508. 

  3509.         uf *= s->input_mirror_modifier[0] * s->input_mirror_modifier[1];

  3510.         vf *= s->input_mirror_modifier[1];

  3511. 

  3512.         uf = 0.5f * width / 3.f * (uf * scalew + 1.f);

  3513.         vf = height * 0.25f * (vf * scaleh + 1.f) + v_offset;

  3514.     }

  3515. 

  3516.     ui = floorf(uf);

  3517.     vi = floorf(vf);

  3518. 

  3519.     *du = uf - ui;

  3520.     *dv = vf - vi;

  3521. 

  3522.     for (int i = 0; i < 4; i++) {

  3523.         for (int j = 0; j < 4; j++) {

  3524.             us[i][j] = u_shift + av_clip(ui + j - 1, 0, ew - 1);

  3525.             vs[i][j] = v_shift + av_clip(vi + i - 1, 0, eh - 1);

  3526.         }

  3527.     }

  3528. 

  3529.     return 1;

  3530. }

  3531. 

  3532. /**

  3533.  * Calculate 3D coordinates on sphere for corresponding frame position in barrel split facebook's format.

  3534.  *

  3535.  * @param s filter private context

  3536.  * @param i horizontal position on frame [0, width)

  3537.  * @param j vertical position on frame [0, height)

  3538.  * @param width frame width

  3539.  * @param height frame height

  3540.  * @param vec coordinates on sphere

  3541.  */

  3542. static int barrelsplit_to_xyz(const V360Context *s,

  3543.                               int i, int j, int width, int height,

  3544.                               float *vec)

  3545. {

  3546.     const float x = (i + 0.5f) / width;

  3547.     const float y = (j + 0.5f) / height;

  3548.     float l_x, l_y, l_z;

  3549. 

  3550.     if (x < 2.f / 3.f) {

  3551.         const float scalew = s->fout_pad > 0 ? 1.f - s->fout_pad / (width * 2.f / 3.f) : 1.f - s->out_pad;

  3552.         const float scaleh = s->fout_pad > 0 ? 1.f - s->fout_pad / (height / 2.f) : 1.f - s->out_pad;

  3553. 

  3554.         const float back = floorf(y * 2.f);

  3555. 

  3556.         const float phi   = ((3.f / 2.f * x - 0.5f) / scalew - back) * M_PI;

  3557.         const float theta = (y - 0.25f - 0.5f * back) / scaleh * M_PI;

  3558. 

  3559.         const float sin_phi   = sinf(phi);

  3560.         const float cos_phi   = cosf(phi);

  3561.         const float sin_theta = sinf(theta);

  3562.         const float cos_theta = cosf(theta);

  3563. 

  3564.         l_x = cos_theta * sin_phi;

  3565.         l_y = sin_theta;

  3566.         l_z = cos_theta * cos_phi;

  3567.     } else {

  3568.         const float scalew = s->fout_pad > 0 ? 1.f - s->fout_pad / (width  / 3.f) : 1.f - s->out_pad;

  3569.         const float scaleh = s->fout_pad > 0 ? 1.f - s->fout_pad / (height / 4.f) : 1.f - s->out_pad;

  3570. 

  3571.         const int face = floorf(y * 4.f);

  3572.         float uf, vf;

  3573. 

  3574.         uf = x * 3.f - 2.f;

  3575. 

  3576.         switch (face) {

  3577.         case 0:

  3578.             vf = y * 2.f;

  3579.             uf = 1.f - uf;

  3580.             vf = 0.5f - vf;

  3581. 

  3582.             l_x = (0.5f - uf) / scalew;

  3583.             l_y = -0.5f;

  3584.             l_z = (0.5f - vf) / scaleh;

  3585.             break;

  3586.         case 1:

  3587.             vf = y * 2.f;

  3588.             uf = 1.f - uf;

  3589.             vf = 1.f - (vf - 0.5f);

  3590. 

  3591.             l_x = (0.5f - uf) / scalew;

  3592.             l_y =  0.5f;

  3593.             l_z = (-0.5f + vf) / scaleh;

  3594.             break;

  3595.         case 2:

  3596.             vf = y * 2.f - 0.5f;

  3597.             vf = 1.f - (1.f - vf);

  3598. 

  3599.             l_x = (0.5f - uf) / scalew;

  3600.             l_y = -0.5f;

  3601.             l_z = (0.5f - vf) / scaleh;

  3602.             break;

  3603.         case 3:

  3604.             vf = y * 2.f - 1.5f;

  3605. 

  3606.             l_x = (0.5f - uf) / scalew;

  3607.             l_y =  0.5f;

  3608.             l_z = (-0.5f + vf) / scaleh;

  3609.             break;

  3610.         }

  3611.     }

  3612. 

  3613.     vec[0] = l_x;

  3614.     vec[1] = l_y;

  3615.     vec[2] = l_z;

  3616. 

  3617.     normalize_vector(vec);

  3618. 

  3619.     return 1;

  3620. }

  3621. 

  3622. /**

  3623.  * Calculate 3D coordinates on sphere for corresponding frame position in tspyramid format.

  3624.  *

  3625.  * @param s filter private context

  3626.  * @param i horizontal position on frame [0, width)

  3627.  * @param j vertical position on frame [0, height)

  3628.  * @param width frame width

  3629.  * @param height frame height

  3630.  * @param vec coordinates on sphere

  3631.  */

  3632. static int tspyramid_to_xyz(const V360Context *s,

  3633.                             int i, int j, int width, int height,

  3634.                             float *vec)

  3635. {

  3636.     const float x = (i + 0.5f) / width;

  3637.     const float y = (j + 0.5f) / height;

  3638. 

  3639.     if (x < 0.5f) {

  3640.         vec[0] =  x * 4.f - 1.f;

  3641.         vec[1] = (y * 2.f - 1.f);

  3642.         vec[2] = 1.f;

  3643.     } else if (x >= 0.6875f && x < 0.8125f &&

  3644.                y >= 0.375f  && y < 0.625f) {

  3645.         vec[0] = -(x - 0.6875f) * 16.f + 1.f;

  3646.         vec[1] = (y - 0.375f) * 8.f - 1.f;

  3647.         vec[2] = -1.f;

  3648.     } else if (0.5f <= x && x < 0.6875f &&

  3649.                ((0.f <= y && y < 0.375f && y >= 2.f * (x - 0.5f)) ||

  3650.                 (0.375f <= y && y < 0.625f) ||

  3651.                 (0.625f <= y && y < 1.f && y <= 2.f * (1.f - x)))) {

  3652.         vec[0] =  1.f;

  3653.         vec[1] =  2.f * (y - 2.f * x + 1.f) / (3.f - 4.f * x) - 1.f;

  3654.         vec[2] = -2.f * (x - 0.5f) / 0.1875f + 1.f;

  3655.     } else if (0.8125f <= x && x < 1.f &&

  3656.                ((0.f <= y && y < 0.375f && x >= (1.f - y / 2.f)) ||

  3657.                 (0.375f <= y && y < 0.625f) ||

  3658.                 (0.625f <= y && y < 1.f && y <= (2.f * x - 1.f)))) {

  3659.         vec[0] = -1.f;

  3660.         vec[1] =  2.f * (y + 2.f * x - 2.f) / (4.f * x - 3.f) - 1.f;

  3661.         vec[2] =  2.f * (x - 0.8125f) / 0.1875f - 1.f;

  3662.     } else if (0.f <= y && y < 0.375f &&

  3663.                ((0.5f <= x && x < 0.8125f && y < 2.f * (x - 0.5f)) ||

  3664.                 (0.6875f <= x && x < 0.8125f) ||

  3665.                 (0.8125f <= x && x < 1.f && x < (1.f - y / 2.f)))) {

  3666.         vec[0] =  2.f * (1.f - x - 0.5f * y) / (0.5f - y) - 1.f;

  3667.         vec[1] = -1.f;

  3668.         vec[2] =  2.f * (0.375f - y) / 0.375f - 1.f;

  3669.     } else {

  3670.         vec[0] =  2.f * (0.5f - x + 0.5f * y) / (y - 0.5f) - 1.f;

  3671.         vec[1] =  1.f;

  3672.         vec[2] = -2.f * (1.f - y) / 0.375f + 1.f;

  3673.     }

  3674. 

  3675.     normalize_vector(vec);

  3676. 

  3677.     return 1;

  3678. }

  3679. 

  3680. /**

  3681.  * Calculate frame position in tspyramid format for corresponding 3D coordinates on sphere.

  3682.  *

  3683.  * @param s filter private context

  3684.  * @param vec coordinates on sphere

  3685.  * @param width frame width

  3686.  * @param height frame height

  3687.  * @param us horizontal coordinates for interpolation window

  3688.  * @param vs vertical coordinates for interpolation window

  3689.  * @param du horizontal relative coordinate

  3690.  * @param dv vertical relative coordinate

  3691.  */

  3692. static int xyz_to_tspyramid(const V360Context *s,

  3693.                             const float *vec, int width, int height,

  3694.                             int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)

  3695. {

  3696.     float uf, vf;

  3697.     int ui, vi;

  3698.     int face;

  3699. 

  3700.     xyz_to_cube(s, vec, &uf, &vf, &face);

  3701. 

  3702.     uf = (uf + 1.f) * 0.5f;

  3703.     vf = (vf + 1.f) * 0.5f;

  3704. 

  3705.     switch (face) {

  3706.     case UP:

  3707.         uf = 0.1875f * vf - 0.375f * uf * vf - 0.125f * uf + 0.8125f;

  3708.         vf = 0.375f - 0.375f * vf;

  3709.         break;

  3710.     case FRONT:

  3711.         uf = 0.5f * uf;

  3712.         break;

  3713.     case DOWN:

  3714.         uf = 1.f - 0.1875f * vf - 0.5f * uf + 0.375f * uf * vf;

  3715.         vf = 1.f - 0.375f * vf;

  3716.         break;

  3717.     case LEFT:

  3718.         vf = 0.25f * vf + 0.75f * uf * vf - 0.375f * uf + 0.375f;

  3719.         uf = 0.1875f * uf + 0.8125f;

  3720.         break;

  3721.     case RIGHT:

  3722.         vf = 0.375f * uf - 0.75f * uf * vf + vf;

  3723.         uf = 0.1875f * uf + 0.5f;

  3724.         break;

  3725.     case BACK:

  3726.         uf = 0.125f * uf + 0.6875f;

  3727.         vf = 0.25f * vf + 0.375f;

  3728.         break;

  3729.     }

  3730. 

  3731.     uf *= width;

  3732.     vf *= height;

  3733. 

  3734.     ui = floorf(uf);

  3735.     vi = floorf(vf);

  3736. 

  3737.     *du = uf - ui;

  3738.     *dv = vf - vi;

  3739. 

  3740.     for (int i = 0; i < 4; i++) {

  3741.         for (int j = 0; j < 4; j++) {

  3742.             us[i][j] = reflectx(ui + j - 1, vi + i - 1, width, height);

  3743.             vs[i][j] = reflecty(vi + i - 1, height);

  3744.         }

  3745.     }

  3746. 

  3747.     return 1;

  3748. }

  3749. 

  3750. static void multiply_matrix(float c[3][3], const float a[3][3], const float b[3][3])

  3751. {

  3752.     for (int i = 0; i < 3; i++) {

  3753.         for (int j = 0; j < 3; j++) {

  3754.             float sum = 0.f;

  3755. 

  3756.             for (int k = 0; k < 3; k++)

  3757.                 sum += a[i][k] * b[k][j];

  3758. 

  3759.             c[i][j] = sum;

  3760.         }

  3761.     }

  3762. }

  3763. 

  3764. /**

  3765.  * Calculate rotation matrix for yaw/pitch/roll angles.

  3766.  */

  3767. static inline void calculate_rotation_matrix(float yaw, float pitch, float roll,

  3768.                                              float rot_mat[3][3],

  3769.                                              const int rotation_order[3])

  3770. {

  3771.     const float yaw_rad   = yaw   * M_PI / 180.f;

  3772.     const float pitch_rad = pitch * M_PI / 180.f;

  3773.     const float roll_rad  = roll  * M_PI / 180.f;

  3774. 

  3775.     const float sin_yaw   = sinf(yaw_rad);

  3776.     const float cos_yaw   = cosf(yaw_rad);

  3777.     const float sin_pitch = sinf(pitch_rad);

  3778.     const float cos_pitch = cosf(pitch_rad);

  3779.     const float sin_roll  = sinf(roll_rad);

  3780.     const float cos_roll  = cosf(roll_rad);

  3781. 

  3782.     float m[3][3][3];

  3783.     float temp[3][3];

  3784. 

  3785.     m[0][0][0] =  cos_yaw;  m[0][0][1] = 0;          m[0][0][2] =  sin_yaw;

  3786.     m[0][1][0] =  0;        m[0][1][1] = 1;          m[0][1][2] =  0;

  3787.     m[0][2][0] = -sin_yaw;  m[0][2][1] = 0;          m[0][2][2] =  cos_yaw;

  3788. 

  3789.     m[1][0][0] = 1;         m[1][0][1] = 0;          m[1][0][2] =  0;

  3790.     m[1][1][0] = 0;         m[1][1][1] = cos_pitch;  m[1][1][2] = -sin_pitch;

  3791.     m[1][2][0] = 0;         m[1][2][1] = sin_pitch;  m[1][2][2] =  cos_pitch;

  3792. 

  3793.     m[2][0][0] = cos_roll;  m[2][0][1] = -sin_roll;  m[2][0][2] =  0;

  3794.     m[2][1][0] = sin_roll;  m[2][1][1] =  cos_roll;  m[2][1][2] =  0;

  3795.     m[2][2][0] = 0;         m[2][2][1] =  0;         m[2][2][2] =  1;

  3796. 

  3797.     multiply_matrix(temp, m[rotation_order[0]], m[rotation_order[1]]);

  3798.     multiply_matrix(rot_mat, temp, m[rotation_order[2]]);

  3799. }

  3800. 

  3801. /**

  3802.  * Rotate vector with given rotation matrix.

  3803.  *

  3804.  * @param rot_mat rotation matrix

  3805.  * @param vec vector

  3806.  */

  3807. static inline void rotate(const float rot_mat[3][3],

  3808.                           float *vec)

  3809. {

  3810.     const float x_tmp = vec[0] * rot_mat[0][0] + vec[1] * rot_mat[0][1] + vec[2] * rot_mat[0][2];

  3811.     const float y_tmp = vec[0] * rot_mat[1][0] + vec[1] * rot_mat[1][1] + vec[2] * rot_mat[1][2];

  3812.     const float z_tmp = vec[0] * rot_mat[2][0] + vec[1] * rot_mat[2][1] + vec[2] * rot_mat[2][2];

  3813. 

  3814.     vec[0] = x_tmp;

  3815.     vec[1] = y_tmp;

  3816.     vec[2] = z_tmp;

  3817. }

  3818. 

  3819. static inline void set_mirror_modifier(int h_flip, int v_flip, int d_flip,

  3820.                                        float *modifier)

  3821. {

  3822.     modifier[0] = h_flip ? -1.f : 1.f;

  3823.     modifier[1] = v_flip ? -1.f : 1.f;

  3824.     modifier[2] = d_flip ? -1.f : 1.f;

  3825. }

  3826. 

  3827. static inline void mirror(const float *modifier, float *vec)

  3828. {

  3829.     vec[0] *= modifier[0];

  3830.     vec[1] *= modifier[1];

  3831.     vec[2] *= modifier[2];

  3832. }

  3833. 

  3834. static int allocate_plane(V360Context *s, int sizeof_uv, int sizeof_ker, int sizeof_mask, int p)

  3835. {

  3836.     if (!s->u[p])

  3837.         s->u[p] = av_calloc(s->uv_linesize[p] * s->pr_height[p], sizeof_uv);

  3838.     if (!s->v[p])

  3839.         s->v[p] = av_calloc(s->uv_linesize[p] * s->pr_height[p], sizeof_uv);

  3840.     if (!s->u[p] || !s->v[p])

  3841.         return AVERROR(ENOMEM);

  3842.     if (sizeof_ker) {

  3843.         if (!s->ker[p])

  3844.             s->ker[p] = av_calloc(s->uv_linesize[p] * s->pr_height[p], sizeof_ker);

  3845.         if (!s->ker[p])

  3846.             return AVERROR(ENOMEM);

  3847.     }

  3848. 

  3849.     if (sizeof_mask && !p) {

  3850.         if (!s->mask)

  3851.             s->mask = av_calloc(s->pr_width[p] * s->pr_height[p], sizeof_mask);

  3852.         if (!s->mask)

  3853.             return AVERROR(ENOMEM);

  3854.     }

  3855. 

  3856.     return 0;

  3857. }

  3858. 

  3859. static void fov_from_dfov(int format, float d_fov, float w, float h, float *h_fov, float *v_fov)

  3860. {

  3861.     switch (format) {

  3862.     case ORTHOGRAPHIC:

  3863.         {

  3864.             const float d = 0.5f * hypotf(w, h);

  3865.             const float l = sinf(d_fov * M_PI / 360.f) / d;

  3866. 

  3867.             *h_fov = asinf(w * 0.5 * l) * 360.f / M_PI;

  3868.             *v_fov = asinf(h * 0.5 * l) * 360.f / M_PI;

  3869. 

  3870.             if (d_fov > 180.f) {

  3871.                 *h_fov = 180.f - *h_fov;

  3872.                 *v_fov = 180.f - *v_fov;

  3873.             }

  3874.         }

  3875.         break;

  3876.     case EQUISOLID:

  3877.         {

  3878.             const float d = 0.5f * hypotf(w, h);

  3879.             const float l = d / (sinf(d_fov * M_PI / 720.f));

  3880. 

  3881.             *h_fov = 2.f * asinf(w * 0.5f / l) * 360.f / M_PI;

  3882.             *v_fov = 2.f * asinf(h * 0.5f / l) * 360.f / M_PI;

  3883.         }

  3884.         break;

  3885.     case STEREOGRAPHIC:

  3886.         {

  3887.             const float d = 0.5f * hypotf(w, h);

  3888.             const float l = d / (tanf(d_fov * M_PI / 720.f));

  3889. 

  3890.             *h_fov = 2.f * atan2f(w * 0.5f, l) * 360.f / M_PI;

  3891.             *v_fov = 2.f * atan2f(h * 0.5f, l) * 360.f / M_PI;

  3892.         }

  3893.         break;

  3894.     case DUAL_FISHEYE:

  3895.         {

  3896.             const float d = 0.5f * hypotf(w * 0.5f, h);

  3897. 

  3898.             *h_fov = d / w * 2.f * d_fov;

  3899.             *v_fov = d / h * d_fov;

  3900.         }

  3901.         break;

  3902.     case FISHEYE:

  3903.         {

  3904.             const float d = 0.5f * hypotf(w, h);

  3905. 

  3906.             *h_fov = d / w * d_fov;

  3907.             *v_fov = d / h * d_fov;

  3908.         }

  3909.         break;

  3910.     case FLAT:

  3911.     default:

  3912.         {

  3913.             const float da = tanf(0.5f * FFMIN(d_fov, 359.f) * M_PI / 180.f);

  3914.             const float d = hypotf(w, h);

  3915. 

  3916.             *h_fov = atan2f(da * w, d) * 360.f / M_PI;

  3917.             *v_fov = atan2f(da * h, d) * 360.f / M_PI;

  3918. 

  3919.             if (*h_fov < 0.f)

  3920.                 *h_fov += 360.f;

  3921.             if (*v_fov < 0.f)

  3922.                 *v_fov += 360.f;

  3923.         }

  3924.         break;

  3925.     }

  3926. }

  3927. 

  3928. static void set_dimensions(int *outw, int *outh, int w, int h, const AVPixFmtDescriptor *desc)

  3929. {

  3930.     outw[1] = outw[2] = FF_CEIL_RSHIFT(w, desc->log2_chroma_w);

  3931.     outw[0] = outw[3] = w;

  3932.     outh[1] = outh[2] = FF_CEIL_RSHIFT(h, desc->log2_chroma_h);

  3933.     outh[0] = outh[3] = h;

  3934. }

  3935. 

  3936. // Calculate remap data

  3937. static av_always_inline int v360_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)

  3938. {

  3939.     V360Context *s = ctx->priv;

  3940. 

  3941.     for (int p = 0; p < s->nb_allocated; p++) {

  3942.         const int max_value = s->max_value;

  3943.         const int width = s->pr_width[p];

  3944.         const int uv_linesize = s->uv_linesize[p];

  3945.         const int height = s->pr_height[p];

  3946.         const int in_width = s->inplanewidth[p];

  3947.         const int in_height = s->inplaneheight[p];

  3948.         const int slice_start = (height *  jobnr     ) / nb_jobs;

  3949.         const int slice_end   = (height * (jobnr + 1)) / nb_jobs;

  3950.         float du, dv;

  3951.         float vec[3];

  3952.         XYRemap rmap;

  3953. 

  3954.         for (int j = slice_start; j < slice_end; j++) {

  3955.             for (int i = 0; i < width; i++) {

  3956.                 int16_t *u = s->u[p] + (j * uv_linesize + i) * s->elements;

  3957.                 int16_t *v = s->v[p] + (j * uv_linesize + i) * s->elements;

  3958.                 int16_t *ker = s->ker[p] + (j * uv_linesize + i) * s->elements;

  3959.                 uint8_t *mask8 = p ? NULL : s->mask + (j * s->pr_width[0] + i);

  3960.                 uint16_t *mask16 = p ? NULL : (uint16_t *)s->mask + (j * s->pr_width[0] + i);

  3961.                 int in_mask, out_mask;

  3962. 

  3963.                 if (s->out_transpose)

  3964.                     out_mask = s->out_transform(s, j, i, height, width, vec);

  3965.                 else

  3966.                     out_mask = s->out_transform(s, i, j, width, height, vec);

  3967.                 av_assert1(!isnan(vec[0]) && !isnan(vec[1]) && !isnan(vec[2]));

  3968.                 rotate(s->rot_mat, vec);

  3969.                 av_assert1(!isnan(vec[0]) && !isnan(vec[1]) && !isnan(vec[2]));

  3970.                 normalize_vector(vec);

  3971.                 mirror(s->output_mirror_modifier, vec);

  3972.                 if (s->in_transpose)

  3973.                     in_mask = s->in_transform(s, vec, in_height, in_width, rmap.v, rmap.u, &du, &dv);

  3974.                 else

  3975.                     in_mask = s->in_transform(s, vec, in_width, in_height, rmap.u, rmap.v, &du, &dv);

  3976.                 av_assert1(!isnan(du) && !isnan(dv));

  3977.                 s->calculate_kernel(du, dv, &rmap, u, v, ker);

  3978. 

  3979.                 if (!p && s->mask) {

  3980.                     if (s->mask_size == 1) {

  3981.                         mask8[0] = 255 * (out_mask & in_mask);

  3982.                     } else {

  3983.                         mask16[0] = max_value * (out_mask & in_mask);

  3984.                     }

  3985.                 }

  3986.             }

  3987.         }

  3988.     }

  3989. 

  3990.     return 0;

  3991. }

  3992. 

  3993. static int config_output(AVFilterLink *outlink)

  3994. {

  3995.     AVFilterContext *ctx = outlink->src;

  3996.     AVFilterLink *inlink = ctx->inputs[0];

  3997.     V360Context *s = ctx->priv;

  3998.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);

  3999.     const int depth = desc->comp[0].depth;

  4000.     const int sizeof_mask = s->mask_size = (depth + 7) >> 3;

  4001.     int sizeof_uv;

  4002.     int sizeof_ker;

  4003.     int err;

  4004.     int h, w;

  4005.     int in_offset_h, in_offset_w;

  4006.     int out_offset_h, out_offset_w;

  4007.     float hf, wf;

  4008.     int (*prepare_out)(AVFilterContext *ctx);

  4009.     int have_alpha;

  4010. 

  4011.     s->max_value = (1 << depth) - 1;

  4012.     s->input_mirror_modifier[0] = s->ih_flip ? -1.f : 1.f;

  4013.     s->input_mirror_modifier[1] = s->iv_flip ? -1.f : 1.f;

  4014. 

  4015.     switch (s->interp) {

  4016.     case NEAREST:

  4017.         s->calculate_kernel = nearest_kernel;

  4018.         s->remap_slice = depth <= 8 ? remap1_8bit_slice : remap1_16bit_slice;

  4019.         s->elements = 1;

  4020.         sizeof_uv = sizeof(int16_t) * s->elements;

  4021.         sizeof_ker = 0;

  4022.         break;

  4023.     case BILINEAR:

  4024.         s->calculate_kernel = bilinear_kernel;

  4025.         s->remap_slice = depth <= 8 ? remap2_8bit_slice : remap2_16bit_slice;

  4026.         s->elements = 2 * 2;

  4027.         sizeof_uv = sizeof(int16_t) * s->elements;

  4028.         sizeof_ker = sizeof(int16_t) * s->elements;

  4029.         break;

  4030.     case LAGRANGE9:

  4031.         s->calculate_kernel = lagrange_kernel;

  4032.         s->remap_slice = depth <= 8 ? remap3_8bit_slice : remap3_16bit_slice;

  4033.         s->elements = 3 * 3;

  4034.         sizeof_uv = sizeof(int16_t) * s->elements;

  4035.         sizeof_ker = sizeof(int16_t) * s->elements;

  4036.         break;

  4037.     case BICUBIC:

  4038.         s->calculate_kernel = bicubic_kernel;

  4039.         s->remap_slice = depth <= 8 ? remap4_8bit_slice : remap4_16bit_slice;

  4040.         s->elements = 4 * 4;

  4041.         sizeof_uv = sizeof(int16_t) * s->elements;

  4042.         sizeof_ker = sizeof(int16_t) * s->elements;

  4043.         break;

  4044.     case LANCZOS:

  4045.         s->calculate_kernel = lanczos_kernel;

  4046.         s->remap_slice = depth <= 8 ? remap4_8bit_slice : remap4_16bit_slice;

  4047.         s->elements = 4 * 4;

  4048.         sizeof_uv = sizeof(int16_t) * s->elements;

  4049.         sizeof_ker = sizeof(int16_t) * s->elements;

  4050.         break;

  4051.     case SPLINE16:

  4052.         s->calculate_kernel = spline16_kernel;

  4053.         s->remap_slice = depth <= 8 ? remap4_8bit_slice : remap4_16bit_slice;

  4054.         s->elements = 4 * 4;

  4055.         sizeof_uv = sizeof(int16_t) * s->elements;

  4056.         sizeof_ker = sizeof(int16_t) * s->elements;

  4057.         break;

  4058.     case GAUSSIAN:

  4059.         s->calculate_kernel = gaussian_kernel;

  4060.         s->remap_slice = depth <= 8 ? remap4_8bit_slice : remap4_16bit_slice;

  4061.         s->elements = 4 * 4;

  4062.         sizeof_uv = sizeof(int16_t) * s->elements;

  4063.         sizeof_ker = sizeof(int16_t) * s->elements;

  4064.         break;

  4065.     default:

  4066.         av_assert0(0);

  4067.     }

  4068. 

  4069.     ff_v360_init(s, depth);

  4070. 

  4071.     for (int order = 0; order < NB_RORDERS; order++) {

  4072.         const char c = s->rorder[order];

  4073.         int rorder;

  4074. 

  4075.         if (c == '\0') {

  4076.             av_log(ctx, AV_LOG_WARNING,

  4077.                    "Incomplete rorder option. Direction for all 3 rotation orders should be specified. Switching to default rorder.\n");

  4078.             s->rotation_order[0] = YAW;

  4079.             s->rotation_order[1] = PITCH;

  4080.             s->rotation_order[2] = ROLL;

  4081.             break;

  4082.         }

  4083. 

  4084.         rorder = get_rorder(c);

  4085.         if (rorder == -1) {

  4086.             av_log(ctx, AV_LOG_WARNING,

  4087.                    "Incorrect rotation order symbol '%c' in rorder option. Switching to default rorder.\n", c);

  4088.             s->rotation_order[0] = YAW;

  4089.             s->rotation_order[1] = PITCH;

  4090.             s->rotation_order[2] = ROLL;

  4091.             break;

  4092.         }

  4093. 

  4094.         s->rotation_order[order] = rorder;

  4095.     }

  4096. 

  4097.     switch (s->in_stereo) {

  4098.     case STEREO_2D:

  4099.         w = inlink->w;

  4100.         h = inlink->h;

  4101.         in_offset_w = in_offset_h = 0;

  4102.         break;

  4103.     case STEREO_SBS:

  4104.         w = inlink->w / 2;

  4105.         h = inlink->h;

  4106.         in_offset_w = w;

  4107.         in_offset_h = 0;

  4108.         break;

  4109.     case STEREO_TB:

  4110.         w = inlink->w;

  4111.         h = inlink->h / 2;

  4112.         in_offset_w = 0;

  4113.         in_offset_h = h;

  4114.         break;

  4115.     default:

  4116.         av_assert0(0);

  4117.     }

  4118. 

  4119.     set_dimensions(s->inplanewidth, s->inplaneheight, w, h, desc);

  4120.     set_dimensions(s->in_offset_w, s->in_offset_h, in_offset_w, in_offset_h, desc);

  4121. 

  4122.     s->in_width = s->inplanewidth[0];

  4123.     s->in_height = s->inplaneheight[0];

  4124. 

  4125.     if (s->id_fov > 0.f)

  4126.         fov_from_dfov(s->in, s->id_fov, w, h, &s->ih_fov, &s->iv_fov);

  4127. 

  4128.     if (s->in_transpose)

  4129.         FFSWAP(int, s->in_width, s->in_height);

  4130. 

  4131.     switch (s->in) {

  4132.     case EQUIRECTANGULAR:

  4133.         s->in_transform = xyz_to_equirect;

  4134.         err = 0;

  4135.         wf = w;

  4136.         hf = h;

  4137.         break;

  4138.     case CUBEMAP_3_2:

  4139.         s->in_transform = xyz_to_cube3x2;

  4140.         err = prepare_cube_in(ctx);

  4141.         wf = w / 3.f * 4.f;

  4142.         hf = h;

  4143.         break;

  4144.     case CUBEMAP_1_6:

  4145.         s->in_transform = xyz_to_cube1x6;

  4146.         err = prepare_cube_in(ctx);

  4147.         wf = w * 4.f;

  4148.         hf = h / 3.f;

  4149.         break;

  4150.     case CUBEMAP_6_1:

  4151.         s->in_transform = xyz_to_cube6x1;

  4152.         err = prepare_cube_in(ctx);

  4153.         wf = w / 3.f * 2.f;

  4154.         hf = h * 2.f;

  4155.         break;

  4156.     case EQUIANGULAR:

  4157.         s->in_transform = xyz_to_eac;

  4158.         err = prepare_eac_in(ctx);

  4159.         wf = w;

  4160.         hf = h / 9.f * 8.f;

  4161.         break;

  4162.     case FLAT:

  4163.         s->in_transform = xyz_to_flat;

  4164.         err = prepare_flat_in(ctx);

  4165.         wf = w;

  4166.         hf = h;

  4167.         break;

  4168.     case PERSPECTIVE:

  4169.         av_log(ctx, AV_LOG_ERROR, "Supplied format is not accepted as input.\n");

  4170.         return AVERROR(EINVAL);

  4171.     case DUAL_FISHEYE:

  4172.         s->in_transform = xyz_to_dfisheye;

  4173.         err = prepare_fisheye_in(ctx);

  4174.         wf = w;

  4175.         hf = h;

  4176.         break;

  4177.     case BARREL:

  4178.         s->in_transform = xyz_to_barrel;

  4179.         err = 0;

  4180.         wf = w / 5.f * 4.f;

  4181.         hf = h;

  4182.         break;

  4183.     case STEREOGRAPHIC:

  4184.         s->in_transform = xyz_to_stereographic;

  4185.         err = prepare_stereographic_in(ctx);

  4186.         wf = w;

  4187.         hf = h / 2.f;

  4188.         break;

  4189.     case MERCATOR:

  4190.         s->in_transform = xyz_to_mercator;

  4191.         err = 0;

  4192.         wf = w;

  4193.         hf = h / 2.f;

  4194.         break;

  4195.     case BALL:

  4196.         s->in_transform = xyz_to_ball;

  4197.         err = 0;

  4198.         wf = w;

  4199.         hf = h / 2.f;

  4200.         break;

  4201.     case HAMMER:

  4202.         s->in_transform = xyz_to_hammer;

  4203.         err = 0;

  4204.         wf = w;

  4205.         hf = h;

  4206.         break;

  4207.     case SINUSOIDAL:

  4208.         s->in_transform = xyz_to_sinusoidal;

  4209.         err = 0;

  4210.         wf = w;

  4211.         hf = h;

  4212.         break;

  4213.     case FISHEYE:

  4214.         s->in_transform = xyz_to_fisheye;

  4215.         err = prepare_fisheye_in(ctx);

  4216.         wf = w * 2;

  4217.         hf = h;

  4218.         break;

  4219.     case PANNINI:

  4220.         s->in_transform = xyz_to_pannini;

  4221.         err = 0;

  4222.         wf = w;

  4223.         hf = h;

  4224.         break;

  4225.     case CYLINDRICAL:

  4226.         s->in_transform = xyz_to_cylindrical;

  4227.         err = prepare_cylindrical_in(ctx);

  4228.         wf = w;

  4229.         hf = h * 2.f;

  4230.         break;

  4231.     case TETRAHEDRON:

  4232.         s->in_transform = xyz_to_tetrahedron;

  4233.         err = 0;

  4234.         wf = w;

  4235.         hf = h;

  4236.         break;

  4237.     case BARREL_SPLIT:

  4238.         s->in_transform = xyz_to_barrelsplit;

  4239.         err = 0;

  4240.         wf = w * 4.f / 3.f;

  4241.         hf = h;

  4242.         break;

  4243.     case TSPYRAMID:

  4244.         s->in_transform = xyz_to_tspyramid;

  4245.         err = 0;

  4246.         wf = w;

  4247.         hf = h;

  4248.         break;

  4249.     case HEQUIRECTANGULAR:

  4250.         s->in_transform = xyz_to_hequirect;

  4251.         err = 0;

  4252.         wf = w * 2.f;

  4253.         hf = h;

  4254.         break;

  4255.     case EQUISOLID:

  4256.         s->in_transform = xyz_to_equisolid;

  4257.         err = prepare_equisolid_in(ctx);

  4258.         wf = w;

  4259.         hf = h / 2.f;

  4260.         break;

  4261.     case ORTHOGRAPHIC:

  4262.         s->in_transform = xyz_to_orthographic;

  4263.         err = prepare_orthographic_in(ctx);

  4264.         wf = w;

  4265.         hf = h / 2.f;

  4266.         break;

  4267.     default:

  4268.         av_log(ctx, AV_LOG_ERROR, "Specified input format is not handled.\n");

  4269.         return AVERROR_BUG;

  4270.     }

  4271. 

  4272.     if (err != 0) {

  4273.         return err;

  4274.     }

  4275. 

  4276.     switch (s->out) {

  4277.     case EQUIRECTANGULAR:

  4278.         s->out_transform = equirect_to_xyz;

  4279.         prepare_out = NULL;

  4280.         w = lrintf(wf);

  4281.         h = lrintf(hf);

  4282.         break;

  4283.     case CUBEMAP_3_2:

  4284.         s->out_transform = cube3x2_to_xyz;

  4285.         prepare_out = prepare_cube_out;

  4286.         w = lrintf(wf / 4.f * 3.f);

  4287.         h = lrintf(hf);

  4288.         break;

  4289.     case CUBEMAP_1_6:

  4290.         s->out_transform = cube1x6_to_xyz;

  4291.         prepare_out = prepare_cube_out;

  4292.         w = lrintf(wf / 4.f);

  4293.         h = lrintf(hf * 3.f);

  4294.         break;

  4295.     case CUBEMAP_6_1:

  4296.         s->out_transform = cube6x1_to_xyz;

  4297.         prepare_out = prepare_cube_out;

  4298.         w = lrintf(wf / 2.f * 3.f);

  4299.         h = lrintf(hf / 2.f);

  4300.         break;

  4301.     case EQUIANGULAR:

  4302.         s->out_transform = eac_to_xyz;

  4303.         prepare_out = prepare_eac_out;

  4304.         w = lrintf(wf);

  4305.         h = lrintf(hf / 8.f * 9.f);

  4306.         break;

  4307.     case FLAT:

  4308.         s->out_transform = flat_to_xyz;

  4309.         prepare_out = prepare_flat_out;

  4310.         w = lrintf(wf);

  4311.         h = lrintf(hf);

  4312.         break;

  4313.     case DUAL_FISHEYE:

  4314.         s->out_transform = dfisheye_to_xyz;

  4315.         prepare_out = prepare_fisheye_out;

  4316.         w = lrintf(wf);

  4317.         h = lrintf(hf);

  4318.         break;

  4319.     case BARREL:

  4320.         s->out_transform = barrel_to_xyz;

  4321.         prepare_out = NULL;

  4322.         w = lrintf(wf / 4.f * 5.f);

  4323.         h = lrintf(hf);

  4324.         break;

  4325.     case STEREOGRAPHIC:

  4326.         s->out_transform = stereographic_to_xyz;

  4327.         prepare_out = prepare_stereographic_out;

  4328.         w = lrintf(wf);

  4329.         h = lrintf(hf * 2.f);

  4330.         break;

  4331.     case MERCATOR:

  4332.         s->out_transform = mercator_to_xyz;

  4333.         prepare_out = NULL;

  4334.         w = lrintf(wf);

  4335.         h = lrintf(hf * 2.f);

  4336.         break;

  4337.     case BALL:

  4338.         s->out_transform = ball_to_xyz;

  4339.         prepare_out = NULL;

  4340.         w = lrintf(wf);

  4341.         h = lrintf(hf * 2.f);

  4342.         break;

  4343.     case HAMMER:

  4344.         s->out_transform = hammer_to_xyz;

  4345.         prepare_out = NULL;

  4346.         w = lrintf(wf);

  4347.         h = lrintf(hf);

  4348.         break;

  4349.     case SINUSOIDAL:

  4350.         s->out_transform = sinusoidal_to_xyz;

  4351.         prepare_out = NULL;

  4352.         w = lrintf(wf);

  4353.         h = lrintf(hf);

  4354.         break;

  4355.     case FISHEYE:

  4356.         s->out_transform = fisheye_to_xyz;

  4357.         prepare_out = prepare_fisheye_out;

  4358.         w = lrintf(wf * 0.5f);

  4359.         h = lrintf(hf);

  4360.         break;

  4361.     case PANNINI:

  4362.         s->out_transform = pannini_to_xyz;

  4363.         prepare_out = NULL;

  4364.         w = lrintf(wf);

  4365.         h = lrintf(hf);

  4366.         break;

  4367.     case CYLINDRICAL:

  4368.         s->out_transform = cylindrical_to_xyz;

  4369.         prepare_out = prepare_cylindrical_out;

  4370.         w = lrintf(wf);

  4371.         h = lrintf(hf * 0.5f);

  4372.         break;

  4373.     case PERSPECTIVE:

  4374.         s->out_transform = perspective_to_xyz;

  4375.         prepare_out = NULL;

  4376.         w = lrintf(wf / 2.f);

  4377.         h = lrintf(hf);

  4378.         break;

  4379.     case TETRAHEDRON:

  4380.         s->out_transform = tetrahedron_to_xyz;

  4381.         prepare_out = NULL;

  4382.         w = lrintf(wf);

  4383.         h = lrintf(hf);

  4384.         break;

  4385.     case BARREL_SPLIT:

  4386.         s->out_transform = barrelsplit_to_xyz;

  4387.         prepare_out = NULL;

  4388.         w = lrintf(wf / 4.f * 3.f);

  4389.         h = lrintf(hf);

  4390.         break;

  4391.     case TSPYRAMID:

  4392.         s->out_transform = tspyramid_to_xyz;

  4393.         prepare_out = NULL;

  4394.         w = lrintf(wf);

  4395.         h = lrintf(hf);

  4396.         break;

  4397.     case HEQUIRECTANGULAR:

  4398.         s->out_transform = hequirect_to_xyz;

  4399.         prepare_out = NULL;

  4400.         w = lrintf(wf / 2.f);

  4401.         h = lrintf(hf);

  4402.         break;

  4403.     case EQUISOLID:

  4404.         s->out_transform = equisolid_to_xyz;

  4405.         prepare_out = prepare_equisolid_out;

  4406.         w = lrintf(wf);

  4407.         h = lrintf(hf * 2.f);

  4408.         break;

  4409.     case ORTHOGRAPHIC:

  4410.         s->out_transform = orthographic_to_xyz;

  4411.         prepare_out = prepare_orthographic_out;

  4412.         w = lrintf(wf);

  4413.         h = lrintf(hf * 2.f);

  4414.         break;

  4415.     default:

  4416.         av_log(ctx, AV_LOG_ERROR, "Specified output format is not handled.\n");

  4417.         return AVERROR_BUG;

  4418.     }

  4419. 

  4420.     // Override resolution with user values if specified

  4421.     if (s->width > 0 && s->height <= 0 && s->h_fov > 0.f && s->v_fov > 0.f &&

  4422.         s->out == FLAT && s->d_fov == 0.f) {

  4423.         w = s->width;

  4424.         h = w / tanf(s->h_fov * M_PI / 360.f) * tanf(s->v_fov * M_PI / 360.f);

  4425.     } else if (s->width <= 0 && s->height > 0 && s->h_fov > 0.f && s->v_fov > 0.f &&

  4426.         s->out == FLAT && s->d_fov == 0.f) {

  4427.         h = s->height;

  4428.         w = h / tanf(s->v_fov * M_PI / 360.f) * tanf(s->h_fov * M_PI / 360.f);

  4429.     } else if (s->width > 0 && s->height > 0) {

  4430.         w = s->width;

  4431.         h = s->height;

  4432.     } else if (s->width > 0 || s->height > 0) {

  4433.         av_log(ctx, AV_LOG_ERROR, "Both width and height values should be specified.\n");

  4434.         return AVERROR(EINVAL);

  4435.     } else {

  4436.         if (s->out_transpose)

  4437.             FFSWAP(int, w, h);

  4438. 

  4439.         if (s->in_transpose)

  4440.             FFSWAP(int, w, h);

  4441.     }

  4442. 

  4443.     s->width  = w;

  4444.     s->height = h;

  4445. 

  4446.     if (s->d_fov > 0.f)

  4447.         fov_from_dfov(s->out, s->d_fov, w, h, &s->h_fov, &s->v_fov);

  4448. 

  4449.     if (prepare_out) {

  4450.         err = prepare_out(ctx);

  4451.         if (err != 0)

  4452.             return err;

  4453.     }

  4454. 

  4455.     set_dimensions(s->pr_width, s->pr_height, w, h, desc);

  4456. 

  4457.     switch (s->out_stereo) {

  4458.     case STEREO_2D:

  4459.         out_offset_w = out_offset_h = 0;

  4460.         break;

  4461.     case STEREO_SBS:

  4462.         out_offset_w = w;

  4463.         out_offset_h = 0;

  4464.         w *= 2;

  4465.         break;

  4466.     case STEREO_TB:

  4467.         out_offset_w = 0;

  4468.         out_offset_h = h;

  4469.         h *= 2;

  4470.         break;

  4471.     default:

  4472.         av_assert0(0);

  4473.     }

  4474. 

  4475.     set_dimensions(s->out_offset_w, s->out_offset_h, out_offset_w, out_offset_h, desc);

  4476.     set_dimensions(s->planewidth, s->planeheight, w, h, desc);

  4477. 

  4478.     for (int i = 0; i < 4; i++)

  4479.         s->uv_linesize[i] = FFALIGN(s->pr_width[i], 8);

  4480. 

  4481.     outlink->h = h;

  4482.     outlink->w = w;

  4483. 

  4484.     s->nb_planes = av_pix_fmt_count_planes(inlink->format);

  4485.     have_alpha   = !!(desc->flags & AV_PIX_FMT_FLAG_ALPHA);

  4486. 

  4487.     if (desc->log2_chroma_h == desc->log2_chroma_w && desc->log2_chroma_h == 0) {

  4488.         s->nb_allocated = 1;

  4489.         s->map[0] = s->map[1] = s->map[2] = s->map[3] = 0;

  4490.     } else {

  4491.         s->nb_allocated = 2;

  4492.         s->map[0] = s->map[3] = 0;

  4493.         s->map[1] = s->map[2] = 1;

  4494.     }

  4495. 

  4496.     for (int i = 0; i < s->nb_allocated; i++) {

  4497.         err = allocate_plane(s, sizeof_uv, sizeof_ker, sizeof_mask * have_alpha * s->alpha, i);

  4498.         if (err < 0)

  4499.             return err;

  4500.     }

  4501. 

  4502.     calculate_rotation_matrix(s->yaw, s->pitch, s->roll, s->rot_mat, s->rotation_order);

  4503.     set_mirror_modifier(s->h_flip, s->v_flip, s->d_flip, s->output_mirror_modifier);

  4504. 

  4505.     ctx->internal->execute(ctx, v360_slice, NULL, NULL, FFMIN(outlink->h, ff_filter_get_nb_threads(ctx)));

  4506. 

  4507.     return 0;

  4508. }

  4509. 

  4510. static int filter_frame(AVFilterLink *inlink, AVFrame *in)

  4511. {

  4512.     AVFilterContext *ctx = inlink->dst;

  4513.     AVFilterLink *outlink = ctx->outputs[0];

  4514.     V360Context *s = ctx->priv;

  4515.     AVFrame *out;

  4516.     ThreadData td;

  4517. 

  4518.     out = ff_get_video_buffer(outlink, outlink->w, outlink->h);

  4519.     if (!out) {

  4520.         av_frame_free(&in);

  4521.         return AVERROR(ENOMEM);

  4522.     }

  4523.     av_frame_copy_props(out, in);

  4524. 

  4525.     td.in = in;

  4526.     td.out = out;

  4527. 

  4528.     ctx->internal->execute(ctx, s->remap_slice, &td, NULL, FFMIN(outlink->h, ff_filter_get_nb_threads(ctx)));

  4529. 

  4530.     av_frame_free(&in);

  4531.     return ff_filter_frame(outlink, out);

  4532. }

  4533. 

  4534. static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,

  4535.                            char *res, int res_len, int flags)

  4536. {

  4537.     int ret;

  4538. 

  4539.     ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags);

  4540.     if (ret < 0)

  4541.         return ret;

  4542. 

  4543.     return config_output(ctx->outputs[0]);

  4544. }

  4545. 

  4546. static av_cold void uninit(AVFilterContext *ctx)

  4547. {

  4548.     V360Context *s = ctx->priv;

  4549. 

  4550.     for (int p = 0; p < s->nb_allocated; p++) {

  4551.         av_freep(&s->u[p]);

  4552.         av_freep(&s->v[p]);

  4553.         av_freep(&s->ker[p]);

  4554.     }

  4555.     av_freep(&s->mask);

  4556. }

  4557. 

  4558. static const AVFilterPad inputs[] = {

  4559.     {

  4560.         .name         = "default",

  4561.         .type         = AVMEDIA_TYPE_VIDEO,

  4562.         .filter_frame = filter_frame,

  4563.     },

  4564.     { NULL }

  4565. };

  4566. 

  4567. static const AVFilterPad outputs[] = {

  4568.     {

  4569.         .name         = "default",

  4570.         .type         = AVMEDIA_TYPE_VIDEO,

  4571.         .config_props = config_output,

  4572.     },

  4573.     { NULL }

  4574. };

  4575. 

  4576. AVFilter ff_vf_v360 = {

  4577.     .name          = "v360",

  4578.     .description   = NULL_IF_CONFIG_SMALL("Convert 360 projection of video."),

  4579.     .priv_size     = sizeof(V360Context),

  4580.     .uninit        = uninit,

  4581.     .query_formats = query_formats,

  4582.     .inputs        = inputs,

  4583.     .outputs       = outputs,

  4584.     .priv_class    = &v360_class,

  4585.     .flags         = AVFILTER_FLAG_SLICE_THREADS,

  4586.     .process_command = process_command,

  4587. };