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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  127.     {        "2d", "2d mono",                                    0, AV_OPT_TYPE_CONST,  {.i64=STEREO_2D},       0,                   0, FLAGS, "stereo" },

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

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

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

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

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

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

  134.     {    "in_pad", "percent input cubemap pads",    OFFSET(in_pad), AV_OPT_TYPE_FLOAT,  {.dbl=0.f},           0.f,                 1.f,TFLAGS, "in_pad"},

  135.     {   "out_pad", "percent output cubemap pads",  OFFSET(out_pad), AV_OPT_TYPE_FLOAT,  {.dbl=0.f},           0.f,                 1.f,TFLAGS, "out_pad"},

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  156.     { NULL }

  157. };

  158. 

  159. AVFILTER_DEFINE_CLASS(v360);

  160. 

  161. static int query_formats(AVFilterContext *ctx)

  162. {

  163.     V360Context *s = ctx->priv;

  164.     static const enum AVPixelFormat pix_fmts[] = {

  165.         // YUVA444

  166.         AV_PIX_FMT_YUVA444P,   AV_PIX_FMT_YUVA444P9,

  167.         AV_PIX_FMT_YUVA444P10, AV_PIX_FMT_YUVA444P12,

  168.         AV_PIX_FMT_YUVA444P16,

  169. 

  170.         // YUVA422

  171.         AV_PIX_FMT_YUVA422P,   AV_PIX_FMT_YUVA422P9,

  172.         AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA422P12,

  173.         AV_PIX_FMT_YUVA422P16,

  174. 

  175.         // YUVA420

  176.         AV_PIX_FMT_YUVA420P,   AV_PIX_FMT_YUVA420P9,

  177.         AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA420P16,

  178. 

  179.         // YUVJ

  180.         AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,

  181.         AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,

  182.         AV_PIX_FMT_YUVJ411P,

  183. 

  184.         // YUV444

  185.         AV_PIX_FMT_YUV444P,   AV_PIX_FMT_YUV444P9,

  186.         AV_PIX_FMT_YUV444P10, AV_PIX_FMT_YUV444P12,

  187.         AV_PIX_FMT_YUV444P14, AV_PIX_FMT_YUV444P16,

  188. 

  189.         // YUV440

  190.         AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV440P10,

  191.         AV_PIX_FMT_YUV440P12,

  192. 

  193.         // YUV422

  194.         AV_PIX_FMT_YUV422P,   AV_PIX_FMT_YUV422P9,

  195.         AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV422P12,

  196.         AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV422P16,

  197. 

  198.         // YUV420

  199.         AV_PIX_FMT_YUV420P,   AV_PIX_FMT_YUV420P9,

  200.         AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV420P12,

  201.         AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV420P16,

  202. 

  203.         // YUV411

  204.         AV_PIX_FMT_YUV411P,

  205. 

  206.         // YUV410

  207.         AV_PIX_FMT_YUV410P,

  208. 

  209.         // GBR

  210.         AV_PIX_FMT_GBRP,   AV_PIX_FMT_GBRP9,

  211.         AV_PIX_FMT_GBRP10, AV_PIX_FMT_GBRP12,

  212.         AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,

  213. 

  214.         // GBRA

  215.         AV_PIX_FMT_GBRAP,   AV_PIX_FMT_GBRAP10,

  216.         AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRAP16,

  217. 

  218.         // GRAY

  219.         AV_PIX_FMT_GRAY8,  AV_PIX_FMT_GRAY9,

  220.         AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12,

  221.         AV_PIX_FMT_GRAY14, AV_PIX_FMT_GRAY16,

  222. 

  223.         AV_PIX_FMT_NONE

  224.     };

  225.     static const enum AVPixelFormat alpha_pix_fmts[] = {

  226.         AV_PIX_FMT_YUVA444P,   AV_PIX_FMT_YUVA444P9,

  227.         AV_PIX_FMT_YUVA444P10, AV_PIX_FMT_YUVA444P12,

  228.         AV_PIX_FMT_YUVA444P16,

  229.         AV_PIX_FMT_YUVA422P,   AV_PIX_FMT_YUVA422P9,

  230.         AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA422P12,

  231.         AV_PIX_FMT_YUVA422P16,

  232.         AV_PIX_FMT_YUVA420P,   AV_PIX_FMT_YUVA420P9,

  233.         AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA420P16,

  234.         AV_PIX_FMT_GBRAP,   AV_PIX_FMT_GBRAP10,

  235.         AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRAP16,

  236.         AV_PIX_FMT_NONE

  237.     };

  238. 

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

  240.     if (!fmts_list)

  241.         return AVERROR(ENOMEM);

  242.     return ff_set_common_formats(ctx, fmts_list);

  243. }

  244. 

  245. #define DEFINE_REMAP1_LINE(bits, div)                                                    \

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

  247.                                       ptrdiff_t in_linesize,                             \

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

  249.                                       const int16_t *const ker)                          \

  250. {                                                                                        \

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

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

  253.                                                                                          \

  254.     in_linesize /= div;                                                                  \

  255.                                                                                          \

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

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

  258. }

  259. 

  260. DEFINE_REMAP1_LINE( 8, 1)

  261. DEFINE_REMAP1_LINE(16, 2)

  262. 

  263. /**

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

  265.  *

  266.  * @param ws size of interpolation window

  267.  * @param bits number of bits per pixel

  268.  */

  269. #define DEFINE_REMAP(ws, bits)                                                                             \

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

  271. {                                                                                                          \

  272.     ThreadData *td = arg;                                                                                  \

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

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

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

  276.                                                                                                            \

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  293.                                                                                                            \

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

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

  296.                                                                                                            \

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

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

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

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

  301.                                                                                                            \

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

  303.             }                                                                                              \

  304.                                                                                                            \

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

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

  307.             }                                                                                              \

  308.         }                                                                                                  \

  309.     }                                                                                                      \

  310.                                                                                                            \

  311.     return 0;                                                                                              \

  312. }

  313. 

  314. DEFINE_REMAP(1,  8)

  315. DEFINE_REMAP(2,  8)

  316. DEFINE_REMAP(4,  8)

  317. DEFINE_REMAP(1, 16)

  318. DEFINE_REMAP(2, 16)

  319. DEFINE_REMAP(4, 16)

  320. 

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

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

  323.                                            ptrdiff_t in_linesize,                             \

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

  325.                                            const int16_t *const ker)                          \

  326. {                                                                                             \

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

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

  329.                                                                                               \

  330.     in_linesize /= div;                                                                       \

  331.                                                                                               \

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

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

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

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

  336.         int tmp = 0;                                                                          \

  337.                                                                                               \

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

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

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

  341.             }                                                                                 \

  342.         }                                                                                     \

  343.                                                                                               \

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

  345.     }                                                                                         \

  346. }

  347. 

  348. DEFINE_REMAP_LINE(2,  8, 1)

  349. DEFINE_REMAP_LINE(4,  8, 1)

  350. DEFINE_REMAP_LINE(2, 16, 2)

  351. DEFINE_REMAP_LINE(4, 16, 2)

  352. 

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

  354. {

  355.     switch (s->interp) {

  356.     case NEAREST:

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

  358.         break;

  359.     case BILINEAR:

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

  361.         break;

  362.     case BICUBIC:

  363.     case LANCZOS:

  364.     case SPLINE16:

  365.     case GAUSSIAN:

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

  367.         break;

  368.     }

  369. 

  370.     if (ARCH_X86)

  371.         ff_v360_init_x86(s, depth);

  372. }

  373. 

  374. /**

  375.  * Save nearest pixel coordinates for remapping.

  376.  *

  377.  * @param du horizontal relative coordinate

  378.  * @param dv vertical relative coordinate

  379.  * @param rmap calculated 4x4 window

  380.  * @param u u remap data

  381.  * @param v v remap data

  382.  * @param ker ker remap data

  383.  */

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

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

  386. {

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

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

  389. 

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

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

  392. }

  393. 

  394. /**

  395.  * Calculate kernel for bilinear interpolation.

  396.  *

  397.  * @param du horizontal relative coordinate

  398.  * @param dv vertical relative coordinate

  399.  * @param rmap calculated 4x4 window

  400.  * @param u u remap data

  401.  * @param v v remap data

  402.  * @param ker ker remap data

  403.  */

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

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

  406. {

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

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

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

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

  411.         }

  412.     }

  413. 

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

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

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

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

  418. }

  419. 

  420. /**

  421.  * Calculate 1-dimensional cubic coefficients.

  422.  *

  423.  * @param t relative coordinate

  424.  * @param coeffs coefficients

  425.  */

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

  427. {

  428.     const float tt  = t * t;

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

  430. 

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

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

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

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

  435. }

  436. 

  437. /**

  438.  * Calculate kernel for bicubic interpolation.

  439.  *

  440.  * @param du horizontal relative coordinate

  441.  * @param dv vertical relative coordinate

  442.  * @param rmap calculated 4x4 window

  443.  * @param u u remap data

  444.  * @param v v remap data

  445.  * @param ker ker remap data

  446.  */

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

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

  449. {

  450.     float du_coeffs[4];

  451.     float dv_coeffs[4];

  452. 

  453.     calculate_bicubic_coeffs(du, du_coeffs);

  454.     calculate_bicubic_coeffs(dv, dv_coeffs);

  455. 

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

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

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

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

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

  461.         }

  462.     }

  463. }

  464. 

  465. /**

  466.  * Calculate 1-dimensional lanczos coefficients.

  467.  *

  468.  * @param t relative coordinate

  469.  * @param coeffs coefficients

  470.  */

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

  472. {

  473.     float sum = 0.f;

  474. 

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

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

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

  478.             coeffs[i] = 1.f;

  479.         } else {

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

  481.         }

  482.         sum += coeffs[i];

  483.     }

  484. 

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

  486.         coeffs[i] /= sum;

  487.     }

  488. }

  489. 

  490. /**

  491.  * Calculate kernel for lanczos interpolation.

  492.  *

  493.  * @param du horizontal relative coordinate

  494.  * @param dv vertical relative coordinate

  495.  * @param rmap calculated 4x4 window

  496.  * @param u u remap data

  497.  * @param v v remap data

  498.  * @param ker ker remap data

  499.  */

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

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

  502. {

  503.     float du_coeffs[4];

  504.     float dv_coeffs[4];

  505. 

  506.     calculate_lanczos_coeffs(du, du_coeffs);

  507.     calculate_lanczos_coeffs(dv, dv_coeffs);

  508. 

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

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

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

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

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

  514.         }

  515.     }

  516. }

  517. 

  518. /**

  519.  * Calculate 1-dimensional spline16 coefficients.

  520.  *

  521.  * @param t relative coordinate

  522.  * @param coeffs coefficients

  523.  */

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

  525. {

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

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

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

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

  530. }

  531. 

  532. /**

  533.  * Calculate kernel for spline16 interpolation.

  534.  *

  535.  * @param du horizontal relative coordinate

  536.  * @param dv vertical relative coordinate

  537.  * @param rmap calculated 4x4 window

  538.  * @param u u remap data

  539.  * @param v v remap data

  540.  * @param ker ker remap data

  541.  */

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

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

  544. {

  545.     float du_coeffs[4];

  546.     float dv_coeffs[4];

  547. 

  548.     calculate_spline16_coeffs(du, du_coeffs);

  549.     calculate_spline16_coeffs(dv, dv_coeffs);

  550. 

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

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

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

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

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

  556.         }

  557.     }

  558. }

  559. 

  560. /**

  561.  * Calculate 1-dimensional gaussian coefficients.

  562.  *

  563.  * @param t relative coordinate

  564.  * @param coeffs coefficients

  565.  */

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

  567. {

  568.     float sum = 0.f;

  569. 

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

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

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

  573.             coeffs[i] = 1.f;

  574.         } else {

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

  576.         }

  577.         sum += coeffs[i];

  578.     }

  579. 

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

  581.         coeffs[i] /= sum;

  582.     }

  583. }

  584. 

  585. /**

  586.  * Calculate kernel for gaussian interpolation.

  587.  *

  588.  * @param du horizontal relative coordinate

  589.  * @param dv vertical relative coordinate

  590.  * @param rmap calculated 4x4 window

  591.  * @param u u remap data

  592.  * @param v v remap data

  593.  * @param ker ker remap data

  594.  */

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

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

  597. {

  598.     float du_coeffs[4];

  599.     float dv_coeffs[4];

  600. 

  601.     calculate_gaussian_coeffs(du, du_coeffs);

  602.     calculate_gaussian_coeffs(dv, dv_coeffs);

  603. 

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

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

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

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

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

  609.         }

  610.     }

  611. }

  612. 

  613. /**

  614.  * Modulo operation with only positive remainders.

  615.  *

  616.  * @param a dividend

  617.  * @param b divisor

  618.  *

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

  620.  */

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

  622. {

  623.     const int res = a % b;

  624.     if (res < 0) {

  625.         return res + b;

  626.     } else {

  627.         return res;

  628.     }

  629. }

  630. 

  631. /**

  632.  * Reflect y operation.

  633.  *

  634.  * @param y input vertical position

  635.  * @param h input height

  636.  */

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

  638. {

  639.     if (y < 0) {

  640.         return -y;

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

  642.         return 2 * h - 1 - y;

  643.     }

  644. 

  645.     return y;

  646. }

  647. 

  648. /**

  649.  * Reflect x operation for equirect.

  650.  *

  651.  * @param x input horizontal position

  652.  * @param y input vertical position

  653.  * @param w input width

  654.  * @param h input height

  655.  */

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

  657. {

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

  659.         x += w / 2;

  660. 

  661.     return mod(x, w);

  662. }

  663. 

  664. /**

  665.  * Reflect x operation.

  666.  *

  667.  * @param x input horizontal position

  668.  * @param y input vertical position

  669.  * @param w input width

  670.  * @param h input height

  671.  */

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

  673. {

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

  675.         return w - 1 - x;

  676. 

  677.     return mod(x, w);

  678. }

  679. 

  680. /**

  681.  * Convert char to corresponding direction.

  682.  * Used for cubemap options.

  683.  */

  684. static int get_direction(char c)

  685. {

  686.     switch (c) {

  687.     case 'r':

  688.         return RIGHT;

  689.     case 'l':

  690.         return LEFT;

  691.     case 'u':

  692.         return UP;

  693.     case 'd':

  694.         return DOWN;

  695.     case 'f':

  696.         return FRONT;

  697.     case 'b':

  698.         return BACK;

  699.     default:

  700.         return -1;

  701.     }

  702. }

  703. 

  704. /**

  705.  * Convert char to corresponding rotation angle.

  706.  * Used for cubemap options.

  707.  */

  708. static int get_rotation(char c)

  709. {

  710.     switch (c) {

  711.     case '0':

  712.         return ROT_0;

  713.     case '1':

  714.         return ROT_90;

  715.     case '2':

  716.         return ROT_180;

  717.     case '3':

  718.         return ROT_270;

  719.     default:

  720.         return -1;

  721.     }

  722. }

  723. 

  724. /**

  725.  * Convert char to corresponding rotation order.

  726.  */

  727. static int get_rorder(char c)

  728. {

  729.     switch (c) {

  730.     case 'Y':

  731.     case 'y':

  732.         return YAW;

  733.     case 'P':

  734.     case 'p':

  735.         return PITCH;

  736.     case 'R':

  737.     case 'r':

  738.         return ROLL;

  739.     default:

  740.         return -1;

  741.     }

  742. }

  743. 

  744. /**

  745.  * Prepare data for processing cubemap input format.

  746.  *

  747.  * @param ctx filter context

  748.  *

  749.  * @return error code

  750.  */

  751. static int prepare_cube_in(AVFilterContext *ctx)

  752. {

  753.     V360Context *s = ctx->priv;

  754. 

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

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

  757.         int direction;

  758. 

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

  760.             av_log(ctx, AV_LOG_ERROR,

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

  762.             return AVERROR(EINVAL);

  763.         }

  764. 

  765.         direction = get_direction(c);

  766.         if (direction == -1) {

  767.             av_log(ctx, AV_LOG_ERROR,

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

  769.             return AVERROR(EINVAL);

  770.         }

  771. 

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

  773.     }

  774. 

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

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

  777.         int rotation;

  778. 

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

  780.             av_log(ctx, AV_LOG_ERROR,

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

  782.             return AVERROR(EINVAL);

  783.         }

  784. 

  785.         rotation = get_rotation(c);

  786.         if (rotation == -1) {

  787.             av_log(ctx, AV_LOG_ERROR,

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

  789.             return AVERROR(EINVAL);

  790.         }

  791. 

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

  793.     }

  794. 

  795.     return 0;

  796. }

  797. 

  798. /**

  799.  * Prepare data for processing cubemap output format.

  800.  *

  801.  * @param ctx filter context

  802.  *

  803.  * @return error code

  804.  */

  805. static int prepare_cube_out(AVFilterContext *ctx)

  806. {

  807.     V360Context *s = ctx->priv;

  808. 

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

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

  811.         int direction;

  812. 

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

  814.             av_log(ctx, AV_LOG_ERROR,

  815.                    "Incomplete out_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 out_forder option.\n", c);

  823.             return AVERROR(EINVAL);

  824.         }

  825. 

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

  827.     }

  828. 

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

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

  831.         int rotation;

  832. 

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

  834.             av_log(ctx, AV_LOG_ERROR,

  835.                    "Incomplete out_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 out_frot option.\n", c);

  843.             return AVERROR(EINVAL);

  844.         }

  845. 

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

  847.     }

  848. 

  849.     return 0;

  850. }

  851. 

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

  853. {

  854.     float tmp;

  855. 

  856.     switch (rotation) {

  857.     case ROT_0:

  858.         break;

  859.     case ROT_90:

  860.         tmp =  *uf;

  861.         *uf = -*vf;

  862.         *vf =  tmp;

  863.         break;

  864.     case ROT_180:

  865.         *uf = -*uf;

  866.         *vf = -*vf;

  867.         break;

  868.     case ROT_270:

  869.         tmp = -*uf;

  870.         *uf =  *vf;

  871.         *vf =  tmp;

  872.         break;

  873.     default:

  874.         av_assert0(0);

  875.     }

  876. }

  877. 

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

  879. {

  880.     float tmp;

  881. 

  882.     switch (rotation) {

  883.     case ROT_0:

  884.         break;

  885.     case ROT_90:

  886.         tmp = -*uf;

  887.         *uf =  *vf;

  888.         *vf =  tmp;

  889.         break;

  890.     case ROT_180:

  891.         *uf = -*uf;

  892.         *vf = -*vf;

  893.         break;

  894.     case ROT_270:

  895.         tmp =  *uf;

  896.         *uf = -*vf;

  897.         *vf =  tmp;

  898.         break;

  899.     default:

  900.         av_assert0(0);

  901.     }

  902. }

  903. 

  904. /**

  905.  * Normalize vector.

  906.  *

  907.  * @param vec vector

  908.  */

  909. static void normalize_vector(float *vec)

  910. {

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

  912. 

  913.     vec[0] /= norm;

  914.     vec[1] /= norm;

  915.     vec[2] /= norm;

  916. }

  917. 

  918. /**

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

  920.  * Common operation for every cubemap.

  921.  *

  922.  * @param s filter private context

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

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

  925.  * @param face face of cubemap

  926.  * @param vec coordinates on sphere

  927.  * @param scalew scale for uf

  928.  * @param scaleh scale for vf

  929.  */

  930. static void cube_to_xyz(const V360Context *s,

  931.                         float uf, float vf, int face,

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

  933. {

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

  935.     float l_x, l_y, l_z;

  936. 

  937.     uf /= scalew;

  938.     vf /= scaleh;

  939. 

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

  941. 

  942.     switch (direction) {

  943.     case RIGHT:

  944.         l_x =  1.f;

  945.         l_y = -vf;

  946.         l_z =  uf;

  947.         break;

  948.     case LEFT:

  949.         l_x = -1.f;

  950.         l_y = -vf;

  951.         l_z = -uf;

  952.         break;

  953.     case UP:

  954.         l_x =  uf;

  955.         l_y =  1.f;

  956.         l_z = -vf;

  957.         break;

  958.     case DOWN:

  959.         l_x =  uf;

  960.         l_y = -1.f;

  961.         l_z =  vf;

  962.         break;

  963.     case FRONT:

  964.         l_x =  uf;

  965.         l_y = -vf;

  966.         l_z = -1.f;

  967.         break;

  968.     case BACK:

  969.         l_x = -uf;

  970.         l_y = -vf;

  971.         l_z =  1.f;

  972.         break;

  973.     default:

  974.         av_assert0(0);

  975.     }

  976. 

  977.     vec[0] = l_x;

  978.     vec[1] = l_y;

  979.     vec[2] = l_z;

  980. 

  981.     normalize_vector(vec);

  982. }

  983. 

  984. /**

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

  986.  * Common operation for every cubemap.

  987.  *

  988.  * @param s filter private context

  989.  * @param vec coordinated on sphere

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

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

  992.  * @param direction direction of view

  993.  */

  994. static void xyz_to_cube(const V360Context *s,

  995.                         const float *vec,

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

  997. {

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

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

  1000.     float phi_norm, theta_threshold;

  1001.     int face;

  1002. 

  1003.     if (phi >= -M_PI_4 && phi < M_PI_4) {

  1004.         *direction = FRONT;

  1005.         phi_norm = phi;

  1006.     } else if (phi >= -(M_PI_2 + M_PI_4) && phi < -M_PI_4) {

  1007.         *direction = LEFT;

  1008.         phi_norm = phi + M_PI_2;

  1009.     } else if (phi >= M_PI_4 && phi < M_PI_2 + M_PI_4) {

  1010.         *direction = RIGHT;

  1011.         phi_norm = phi - M_PI_2;

  1012.     } else {

  1013.         *direction = BACK;

  1014.         phi_norm = phi + ((phi > 0.f) ? -M_PI : M_PI);

  1015.     }

  1016. 

  1017.     theta_threshold = atanf(cosf(phi_norm));

  1018.     if (theta > theta_threshold) {

  1019.         *direction = DOWN;

  1020.     } else if (theta < -theta_threshold) {

  1021.         *direction = UP;

  1022.     }

  1023. 

  1024.     switch (*direction) {

  1025.     case RIGHT:

  1026.         *uf =  vec[2] / vec[0];

  1027.         *vf = -vec[1] / vec[0];

  1028.         break;

  1029.     case LEFT:

  1030.         *uf =  vec[2] / vec[0];

  1031.         *vf =  vec[1] / vec[0];

  1032.         break;

  1033.     case UP:

  1034.         *uf =  vec[0] / vec[1];

  1035.         *vf = -vec[2] / vec[1];

  1036.         break;

  1037.     case DOWN:

  1038.         *uf = -vec[0] / vec[1];

  1039.         *vf = -vec[2] / vec[1];

  1040.         break;

  1041.     case FRONT:

  1042.         *uf = -vec[0] / vec[2];

  1043.         *vf =  vec[1] / vec[2];

  1044.         break;

  1045.     case BACK:

  1046.         *uf = -vec[0] / vec[2];

  1047.         *vf = -vec[1] / vec[2];

  1048.         break;

  1049.     default:

  1050.         av_assert0(0);

  1051.     }

  1052. 

  1053.     face = s->in_cubemap_face_order[*direction];

  1054.     rotate_cube_face(uf, vf, s->in_cubemap_face_rotation[face]);

  1055. 

  1056.     (*uf) *= s->input_mirror_modifier[0];

  1057.     (*vf) *= s->input_mirror_modifier[1];

  1058. }

  1059. 

  1060. /**

  1061.  * Find position on another cube face in case of overflow/underflow.

  1062.  * Used for calculation of interpolation window.

  1063.  *

  1064.  * @param s filter private context

  1065.  * @param uf horizontal cubemap coordinate

  1066.  * @param vf vertical cubemap coordinate

  1067.  * @param direction direction of view

  1068.  * @param new_uf new horizontal cubemap coordinate

  1069.  * @param new_vf new vertical cubemap coordinate

  1070.  * @param face face position on cubemap

  1071.  */

  1072. static void process_cube_coordinates(const V360Context *s,

  1073.                                      float uf, float vf, int direction,

  1074.                                      float *new_uf, float *new_vf, int *face)

  1075. {

  1076.     /*

  1077.      *  Cubemap orientation

  1078.      *

  1079.      *           width

  1080.      *         <------->

  1081.      *         +-------+

  1082.      *         |       |                              U

  1083.      *         | up    |                   h       ------->

  1084.      * +-------+-------+-------+-------+ ^ e      |

  1085.      * |       |       |       |       | | i    V |

  1086.      * | left  | front | right | back  | | g      |

  1087.      * +-------+-------+-------+-------+ v h      v

  1088.      *         |       |                   t

  1089.      *         | down  |

  1090.      *         +-------+

  1091.      */

  1092. 

  1093.     *face = s->in_cubemap_face_order[direction];

  1094.     rotate_cube_face_inverse(&uf, &vf, s->in_cubemap_face_rotation[*face]);

  1095. 

  1096.     if ((uf < -1.f || uf >= 1.f) && (vf < -1.f || vf >= 1.f)) {

  1097.         // There are no pixels to use in this case

  1098.         *new_uf = uf;

  1099.         *new_vf = vf;

  1100.     } else if (uf < -1.f) {

  1101.         uf += 2.f;

  1102.         switch (direction) {

  1103.         case RIGHT:

  1104.             direction = FRONT;

  1105.             *new_uf =  uf;

  1106.             *new_vf =  vf;

  1107.             break;

  1108.         case LEFT:

  1109.             direction = BACK;

  1110.             *new_uf =  uf;

  1111.             *new_vf =  vf;

  1112.             break;

  1113.         case UP:

  1114.             direction = LEFT;

  1115.             *new_uf =  vf;

  1116.             *new_vf = -uf;

  1117.             break;

  1118.         case DOWN:

  1119.             direction = LEFT;

  1120.             *new_uf = -vf;

  1121.             *new_vf =  uf;

  1122.             break;

  1123.         case FRONT:

  1124.             direction = LEFT;

  1125.             *new_uf =  uf;

  1126.             *new_vf =  vf;

  1127.             break;

  1128.         case BACK:

  1129.             direction = RIGHT;

  1130.             *new_uf =  uf;

  1131.             *new_vf =  vf;

  1132.             break;

  1133.         default:

  1134.             av_assert0(0);

  1135.         }

  1136.     } else if (uf >= 1.f) {

  1137.         uf -= 2.f;

  1138.         switch (direction) {

  1139.         case RIGHT:

  1140.             direction = BACK;

  1141.             *new_uf =  uf;

  1142.             *new_vf =  vf;

  1143.             break;

  1144.         case LEFT:

  1145.             direction = FRONT;

  1146.             *new_uf =  uf;

  1147.             *new_vf =  vf;

  1148.             break;

  1149.         case UP:

  1150.             direction = RIGHT;

  1151.             *new_uf = -vf;

  1152.             *new_vf =  uf;

  1153.             break;

  1154.         case DOWN:

  1155.             direction = RIGHT;

  1156.             *new_uf =  vf;

  1157.             *new_vf = -uf;

  1158.             break;

  1159.         case FRONT:

  1160.             direction = RIGHT;

  1161.             *new_uf =  uf;

  1162.             *new_vf =  vf;

  1163.             break;

  1164.         case BACK:

  1165.             direction = LEFT;

  1166.             *new_uf =  uf;

  1167.             *new_vf =  vf;

  1168.             break;

  1169.         default:

  1170.             av_assert0(0);

  1171.         }

  1172.     } else if (vf < -1.f) {

  1173.         vf += 2.f;

  1174.         switch (direction) {

  1175.         case RIGHT:

  1176.             direction = UP;

  1177.             *new_uf =  vf;

  1178.             *new_vf = -uf;

  1179.             break;

  1180.         case LEFT:

  1181.             direction = UP;

  1182.             *new_uf = -vf;

  1183.             *new_vf =  uf;

  1184.             break;

  1185.         case UP:

  1186.             direction = BACK;

  1187.             *new_uf = -uf;

  1188.             *new_vf = -vf;

  1189.             break;

  1190.         case DOWN:

  1191.             direction = FRONT;

  1192.             *new_uf =  uf;

  1193.             *new_vf =  vf;

  1194.             break;

  1195.         case FRONT:

  1196.             direction = UP;

  1197.             *new_uf =  uf;

  1198.             *new_vf =  vf;

  1199.             break;

  1200.         case BACK:

  1201.             direction = UP;

  1202.             *new_uf = -uf;

  1203.             *new_vf = -vf;

  1204.             break;

  1205.         default:

  1206.             av_assert0(0);

  1207.         }

  1208.     } else if (vf >= 1.f) {

  1209.         vf -= 2.f;

  1210.         switch (direction) {

  1211.         case RIGHT:

  1212.             direction = DOWN;

  1213.             *new_uf = -vf;

  1214.             *new_vf =  uf;

  1215.             break;

  1216.         case LEFT:

  1217.             direction = DOWN;

  1218.             *new_uf =  vf;

  1219.             *new_vf = -uf;

  1220.             break;

  1221.         case UP:

  1222.             direction = FRONT;

  1223.             *new_uf =  uf;

  1224.             *new_vf =  vf;

  1225.             break;

  1226.         case DOWN:

  1227.             direction = BACK;

  1228.             *new_uf = -uf;

  1229.             *new_vf = -vf;

  1230.             break;

  1231.         case FRONT:

  1232.             direction = DOWN;

  1233.             *new_uf =  uf;

  1234.             *new_vf =  vf;

  1235.             break;

  1236.         case BACK:

  1237.             direction = DOWN;

  1238.             *new_uf = -uf;

  1239.             *new_vf = -vf;

  1240.             break;

  1241.         default:

  1242.             av_assert0(0);

  1243.         }

  1244.     } else {

  1245.         // Inside cube face

  1246.         *new_uf = uf;

  1247.         *new_vf = vf;

  1248.     }

  1249. 

  1250.     *face = s->in_cubemap_face_order[direction];

  1251.     rotate_cube_face(new_uf, new_vf, s->in_cubemap_face_rotation[*face]);

  1252. }

  1253. 

  1254. /**

  1255.  * Calculate 3D coordinates on sphere for corresponding frame position in cubemap3x2 format.

  1256.  *

  1257.  * @param s filter private context

  1258.  * @param i horizontal position on frame [0, width)

  1259.  * @param j vertical position on frame [0, height)

  1260.  * @param width frame width

  1261.  * @param height frame height

  1262.  * @param vec coordinates on sphere

  1263.  */

  1264. static int cube3x2_to_xyz(const V360Context *s,

  1265.                           int i, int j, int width, int height,

  1266.                           float *vec)

  1267. {

  1268.     const float scalew = s->fout_pad > 0 ? 1.f - s->fout_pad / (width  / 3.f) : 1.f - s->out_pad;

  1269.     const float scaleh = s->fout_pad > 0 ? 1.f - s->fout_pad / (height / 2.f) : 1.f - s->out_pad;

  1270. 

  1271.     const float ew = width  / 3.f;

  1272.     const float eh = height / 2.f;

  1273. 

  1274.     const int u_face = floorf(i / ew);

  1275.     const int v_face = floorf(j / eh);

  1276.     const int face = u_face + 3 * v_face;

  1277. 

  1278.     const int u_shift = ceilf(ew * u_face);

  1279.     const int v_shift = ceilf(eh * v_face);

  1280.     const int ewi = ceilf(ew * (u_face + 1)) - u_shift;

  1281.     const int ehi = ceilf(eh * (v_face + 1)) - v_shift;

  1282. 

  1283.     const float uf = 2.f * (i - u_shift + 0.5f) / ewi - 1.f;

  1284.     const float vf = 2.f * (j - v_shift + 0.5f) / ehi - 1.f;

  1285. 

  1286.     cube_to_xyz(s, uf, vf, face, vec, scalew, scaleh);

  1287. 

  1288.     return 1;

  1289. }

  1290. 

  1291. /**

  1292.  * Calculate frame position in cubemap3x2 format for corresponding 3D coordinates on sphere.

  1293.  *

  1294.  * @param s filter private context

  1295.  * @param vec coordinates on sphere

  1296.  * @param width frame width

  1297.  * @param height frame height

  1298.  * @param us horizontal coordinates for interpolation window

  1299.  * @param vs vertical coordinates for interpolation window

  1300.  * @param du horizontal relative coordinate

  1301.  * @param dv vertical relative coordinate

  1302.  */

  1303. static int xyz_to_cube3x2(const V360Context *s,

  1304.                           const float *vec, int width, int height,

  1305.                           int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)

  1306. {

  1307.     const float scalew = s->fin_pad > 0 ? 1.f - s->fin_pad / (width  / 3.f) : 1.f - s->in_pad;

  1308.     const float scaleh = s->fin_pad > 0 ? 1.f - s->fin_pad / (height / 2.f) : 1.f - s->in_pad;

  1309.     const float ew = width  / 3.f;

  1310.     const float eh = height / 2.f;

  1311.     float uf, vf;

  1312.     int ui, vi;

  1313.     int ewi, ehi;

  1314.     int direction, face;

  1315.     int u_face, v_face;

  1316. 

  1317.     xyz_to_cube(s, vec, &uf, &vf, &direction);

  1318. 

  1319.     uf *= scalew;

  1320.     vf *= scaleh;

  1321. 

  1322.     face = s->in_cubemap_face_order[direction];

  1323.     u_face = face % 3;

  1324.     v_face = face / 3;

  1325.     ewi = ceilf(ew * (u_face + 1)) - ceilf(ew * u_face);

  1326.     ehi = ceilf(eh * (v_face + 1)) - ceilf(eh * v_face);

  1327. 

  1328.     uf = 0.5f * ewi * (uf + 1.f) - 0.5f;

  1329.     vf = 0.5f * ehi * (vf + 1.f) - 0.5f;

  1330. 

  1331.     ui = floorf(uf);

  1332.     vi = floorf(vf);

  1333. 

  1334.     *du = uf - ui;

  1335.     *dv = vf - vi;

  1336. 

  1337.     for (int i = 0; i < 4; i++) {

  1338.         for (int j = 0; j < 4; j++) {

  1339.             int new_ui = ui + j - 1;

  1340.             int new_vi = vi + i - 1;

  1341.             int u_shift, v_shift;

  1342.             int new_ewi, new_ehi;

  1343. 

  1344.             if (new_ui >= 0 && new_ui < ewi && new_vi >= 0 && new_vi < ehi) {

  1345.                 face = s->in_cubemap_face_order[direction];

  1346. 

  1347.                 u_face = face % 3;

  1348.                 v_face = face / 3;

  1349.                 u_shift = ceilf(ew * u_face);

  1350.                 v_shift = ceilf(eh * v_face);

  1351.             } else {

  1352.                 uf = 2.f * new_ui / ewi - 1.f;

  1353.                 vf = 2.f * new_vi / ehi - 1.f;

  1354. 

  1355.                 uf /= scalew;

  1356.                 vf /= scaleh;

  1357. 

  1358.                 process_cube_coordinates(s, uf, vf, direction, &uf, &vf, &face);

  1359. 

  1360.                 uf *= scalew;

  1361.                 vf *= scaleh;

  1362. 

  1363.                 u_face = face % 3;

  1364.                 v_face = face / 3;

  1365.                 u_shift = ceilf(ew * u_face);

  1366.                 v_shift = ceilf(eh * v_face);

  1367.                 new_ewi = ceilf(ew * (u_face + 1)) - u_shift;

  1368.                 new_ehi = ceilf(eh * (v_face + 1)) - v_shift;

  1369. 

  1370.                 new_ui = av_clip(lrintf(0.5f * new_ewi * (uf + 1.f)), 0, new_ewi - 1);

  1371.                 new_vi = av_clip(lrintf(0.5f * new_ehi * (vf + 1.f)), 0, new_ehi - 1);

  1372.             }

  1373. 

  1374.             us[i][j] = u_shift + new_ui;

  1375.             vs[i][j] = v_shift + new_vi;

  1376.         }

  1377.     }

  1378. 

  1379.     return 1;

  1380. }

  1381. 

  1382. /**

  1383.  * Calculate 3D coordinates on sphere for corresponding frame position in cubemap1x6 format.

  1384.  *

  1385.  * @param s filter private context

  1386.  * @param i horizontal position on frame [0, width)

  1387.  * @param j vertical position on frame [0, height)

  1388.  * @param width frame width

  1389.  * @param height frame height

  1390.  * @param vec coordinates on sphere

  1391.  */

  1392. static int cube1x6_to_xyz(const V360Context *s,

  1393.                           int i, int j, int width, int height,

  1394.                           float *vec)

  1395. {

  1396.     const float scalew = s->fout_pad > 0 ? 1.f - (float)(s->fout_pad) / width : 1.f - s->out_pad;

  1397.     const float scaleh = s->fout_pad > 0 ? 1.f - s->fout_pad / (height / 6.f) : 1.f - s->out_pad;

  1398. 

  1399.     const float ew = width;

  1400.     const float eh = height / 6.f;

  1401. 

  1402.     const int face = floorf(j / eh);

  1403. 

  1404.     const int v_shift = ceilf(eh * face);

  1405.     const int ehi = ceilf(eh * (face + 1)) - v_shift;

  1406. 

  1407.     const float uf = 2.f * (i           + 0.5f) / ew  - 1.f;

  1408.     const float vf = 2.f * (j - v_shift + 0.5f) / ehi - 1.f;

  1409. 

  1410.     cube_to_xyz(s, uf, vf, face, vec, scalew, scaleh);

  1411. 

  1412.     return 1;

  1413. }

  1414. 

  1415. /**

  1416.  * Calculate 3D coordinates on sphere for corresponding frame position in cubemap6x1 format.

  1417.  *

  1418.  * @param s filter private context

  1419.  * @param i horizontal position on frame [0, width)

  1420.  * @param j vertical position on frame [0, height)

  1421.  * @param width frame width

  1422.  * @param height frame height

  1423.  * @param vec coordinates on sphere

  1424.  */

  1425. static int cube6x1_to_xyz(const V360Context *s,

  1426.                           int i, int j, int width, int height,

  1427.                           float *vec)

  1428. {

  1429.     const float scalew = s->fout_pad > 0 ? 1.f - s->fout_pad / (width / 6.f)   : 1.f - s->out_pad;

  1430.     const float scaleh = s->fout_pad > 0 ? 1.f - (float)(s->fout_pad) / height : 1.f - s->out_pad;

  1431. 

  1432.     const float ew = width / 6.f;

  1433.     const float eh = height;

  1434. 

  1435.     const int face = floorf(i / ew);

  1436. 

  1437.     const int u_shift = ceilf(ew * face);

  1438.     const int ewi = ceilf(ew * (face + 1)) - u_shift;

  1439. 

  1440.     const float uf = 2.f * (i - u_shift + 0.5f) / ewi - 1.f;

  1441.     const float vf = 2.f * (j           + 0.5f) / eh  - 1.f;

  1442. 

  1443.     cube_to_xyz(s, uf, vf, face, vec, scalew, scaleh);

  1444. 

  1445.     return 1;

  1446. }

  1447. 

  1448. /**

  1449.  * Calculate frame position in cubemap1x6 format for corresponding 3D coordinates on sphere.

  1450.  *

  1451.  * @param s filter private context

  1452.  * @param vec coordinates on sphere

  1453.  * @param width frame width

  1454.  * @param height frame height

  1455.  * @param us horizontal coordinates for interpolation window

  1456.  * @param vs vertical coordinates for interpolation window

  1457.  * @param du horizontal relative coordinate

  1458.  * @param dv vertical relative coordinate

  1459.  */

  1460. static int xyz_to_cube1x6(const V360Context *s,

  1461.                           const float *vec, int width, int height,

  1462.                           int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)

  1463. {

  1464.     const float scalew = s->fin_pad > 0 ? 1.f - (float)(s->fin_pad) / width : 1.f - s->in_pad;

  1465.     const float scaleh = s->fin_pad > 0 ? 1.f - s->fin_pad / (height / 6.f) : 1.f - s->in_pad;

  1466.     const float eh = height / 6.f;

  1467.     const int ewi = width;

  1468.     float uf, vf;

  1469.     int ui, vi;

  1470.     int ehi;

  1471.     int direction, face;

  1472. 

  1473.     xyz_to_cube(s, vec, &uf, &vf, &direction);

  1474. 

  1475.     uf *= scalew;

  1476.     vf *= scaleh;

  1477. 

  1478.     face = s->in_cubemap_face_order[direction];

  1479.     ehi = ceilf(eh * (face + 1)) - ceilf(eh * face);

  1480. 

  1481.     uf = 0.5f * ewi * (uf + 1.f) - 0.5f;

  1482.     vf = 0.5f * ehi * (vf + 1.f) - 0.5f;

  1483. 

  1484.     ui = floorf(uf);

  1485.     vi = floorf(vf);

  1486. 

  1487.     *du = uf - ui;

  1488.     *dv = vf - vi;

  1489. 

  1490.     for (int i = 0; i < 4; i++) {

  1491.         for (int j = 0; j < 4; j++) {

  1492.             int new_ui = ui + j - 1;

  1493.             int new_vi = vi + i - 1;

  1494.             int v_shift;

  1495.             int new_ehi;

  1496. 

  1497.             if (new_ui >= 0 && new_ui < ewi && new_vi >= 0 && new_vi < ehi) {

  1498.                 face = s->in_cubemap_face_order[direction];

  1499. 

  1500.                 v_shift = ceilf(eh * face);

  1501.             } else {

  1502.                 uf = 2.f * new_ui / ewi - 1.f;

  1503.                 vf = 2.f * new_vi / ehi - 1.f;

  1504. 

  1505.                 uf /= scalew;

  1506.                 vf /= scaleh;

  1507. 

  1508.                 process_cube_coordinates(s, uf, vf, direction, &uf, &vf, &face);

  1509. 

  1510.                 uf *= scalew;

  1511.                 vf *= scaleh;

  1512. 

  1513.                 v_shift = ceilf(eh * face);

  1514.                 new_ehi = ceilf(eh * (face + 1)) - v_shift;

  1515. 

  1516.                 new_ui = av_clip(lrintf(0.5f *     ewi * (uf + 1.f)), 0,     ewi - 1);

  1517.                 new_vi = av_clip(lrintf(0.5f * new_ehi * (vf + 1.f)), 0, new_ehi - 1);

  1518.             }

  1519. 

  1520.             us[i][j] =           new_ui;

  1521.             vs[i][j] = v_shift + new_vi;

  1522.         }

  1523.     }

  1524. 

  1525.     return 1;

  1526. }

  1527. 

  1528. /**

  1529.  * Calculate frame position in cubemap6x1 format for corresponding 3D coordinates on sphere.

  1530.  *

  1531.  * @param s filter private context

  1532.  * @param vec coordinates on sphere

  1533.  * @param width frame width

  1534.  * @param height frame height

  1535.  * @param us horizontal coordinates for interpolation window

  1536.  * @param vs vertical coordinates for interpolation window

  1537.  * @param du horizontal relative coordinate

  1538.  * @param dv vertical relative coordinate

  1539.  */

  1540. static int xyz_to_cube6x1(const V360Context *s,

  1541.                           const float *vec, int width, int height,

  1542.                           int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)

  1543. {

  1544.     const float scalew = s->fin_pad > 0 ? 1.f - s->fin_pad / (width / 6.f)   : 1.f - s->in_pad;

  1545.     const float scaleh = s->fin_pad > 0 ? 1.f - (float)(s->fin_pad) / height : 1.f - s->in_pad;

  1546.     const float ew = width / 6.f;

  1547.     const int ehi = height;

  1548.     float uf, vf;

  1549.     int ui, vi;

  1550.     int ewi;

  1551.     int direction, face;

  1552. 

  1553.     xyz_to_cube(s, vec, &uf, &vf, &direction);

  1554. 

  1555.     uf *= scalew;

  1556.     vf *= scaleh;

  1557. 

  1558.     face = s->in_cubemap_face_order[direction];

  1559.     ewi = ceilf(ew * (face + 1)) - ceilf(ew * face);

  1560. 

  1561.     uf = 0.5f * ewi * (uf + 1.f) - 0.5f;

  1562.     vf = 0.5f * ehi * (vf + 1.f) - 0.5f;

  1563. 

  1564.     ui = floorf(uf);

  1565.     vi = floorf(vf);

  1566. 

  1567.     *du = uf - ui;

  1568.     *dv = vf - vi;

  1569. 

  1570.     for (int i = 0; i < 4; i++) {

  1571.         for (int j = 0; j < 4; j++) {

  1572.             int new_ui = ui + j - 1;

  1573.             int new_vi = vi + i - 1;

  1574.             int u_shift;

  1575.             int new_ewi;

  1576. 

  1577.             if (new_ui >= 0 && new_ui < ewi && new_vi >= 0 && new_vi < ehi) {

  1578.                 face = s->in_cubemap_face_order[direction];

  1579. 

  1580.                 u_shift = ceilf(ew * face);

  1581.             } else {

  1582.                 uf = 2.f * new_ui / ewi - 1.f;

  1583.                 vf = 2.f * new_vi / ehi - 1.f;

  1584. 

  1585.                 uf /= scalew;

  1586.                 vf /= scaleh;

  1587. 

  1588.                 process_cube_coordinates(s, uf, vf, direction, &uf, &vf, &face);

  1589. 

  1590.                 uf *= scalew;

  1591.                 vf *= scaleh;

  1592. 

  1593.                 u_shift = ceilf(ew * face);

  1594.                 new_ewi = ceilf(ew * (face + 1)) - u_shift;

  1595. 

  1596.                 new_ui = av_clip(lrintf(0.5f * new_ewi * (uf + 1.f)), 0, new_ewi - 1);

  1597.                 new_vi = av_clip(lrintf(0.5f *     ehi * (vf + 1.f)), 0,     ehi - 1);

  1598.             }

  1599. 

  1600.             us[i][j] = u_shift + new_ui;

  1601.             vs[i][j] =           new_vi;

  1602.         }

  1603.     }

  1604. 

  1605.     return 1;

  1606. }

  1607. 

  1608. /**

  1609.  * Calculate 3D coordinates on sphere for corresponding frame position in equirectangular format.

  1610.  *

  1611.  * @param s filter private context

  1612.  * @param i horizontal position on frame [0, width)

  1613.  * @param j vertical position on frame [0, height)

  1614.  * @param width frame width

  1615.  * @param height frame height

  1616.  * @param vec coordinates on sphere

  1617.  */

  1618. static int equirect_to_xyz(const V360Context *s,

  1619.                            int i, int j, int width, int height,

  1620.                            float *vec)

  1621. {

  1622.     const float phi   = ((2.f * i + 0.5f) / width  - 1.f) * M_PI;

  1623.     const float theta = ((2.f * j + 0.5f) / height - 1.f) * M_PI_2;

  1624. 

  1625.     const float sin_phi   = sinf(phi);

  1626.     const float cos_phi   = cosf(phi);

  1627.     const float sin_theta = sinf(theta);

  1628.     const float cos_theta = cosf(theta);

  1629. 

  1630.     vec[0] =  cos_theta * sin_phi;

  1631.     vec[1] = -sin_theta;

  1632.     vec[2] = -cos_theta * cos_phi;

  1633. 

  1634.     return 1;

  1635. }

  1636. 

  1637. /**

  1638.  * Calculate 3D coordinates on sphere for corresponding frame position in half equirectangular format.

  1639.  *

  1640.  * @param s filter private context

  1641.  * @param i horizontal position on frame [0, width)

  1642.  * @param j vertical position on frame [0, height)

  1643.  * @param width frame width

  1644.  * @param height frame height

  1645.  * @param vec coordinates on sphere

  1646.  */

  1647. static int hequirect_to_xyz(const V360Context *s,

  1648.                             int i, int j, int width, int height,

  1649.                             float *vec)

  1650. {

  1651.     const float phi   = ((2.f * i + 0.5f) / width  - 1.f) * M_PI_2;

  1652.     const float theta = ((2.f * j + 0.5f) / height - 1.f) * M_PI_2;

  1653. 

  1654.     const float sin_phi   = sinf(phi);

  1655.     const float cos_phi   = cosf(phi);

  1656.     const float sin_theta = sinf(theta);

  1657.     const float cos_theta = cosf(theta);

  1658. 

  1659.     vec[0] =  cos_theta * sin_phi;

  1660.     vec[1] = -sin_theta;

  1661.     vec[2] = -cos_theta * cos_phi;

  1662. 

  1663.     return 1;

  1664. }

  1665. 

  1666. /**

  1667.  * Prepare data for processing stereographic output format.

  1668.  *

  1669.  * @param ctx filter context

  1670.  *

  1671.  * @return error code

  1672.  */

  1673. static int prepare_stereographic_out(AVFilterContext *ctx)

  1674. {

  1675.     V360Context *s = ctx->priv;

  1676. 

  1677.     s->flat_range[0] = tanf(FFMIN(s->h_fov, 359.f) * M_PI / 720.f);

  1678.     s->flat_range[1] = tanf(FFMIN(s->v_fov, 359.f) * M_PI / 720.f);

  1679. 

  1680.     return 0;

  1681. }

  1682. 

  1683. /**

  1684.  * Calculate 3D coordinates on sphere for corresponding frame position in stereographic format.

  1685.  *

  1686.  * @param s filter private context

  1687.  * @param i horizontal position on frame [0, width)

  1688.  * @param j vertical position on frame [0, height)

  1689.  * @param width frame width

  1690.  * @param height frame height

  1691.  * @param vec coordinates on sphere

  1692.  */

  1693. static int stereographic_to_xyz(const V360Context *s,

  1694.                                 int i, int j, int width, int height,

  1695.                                 float *vec)

  1696. {

  1697.     const float x = ((2.f * i + 1.f) / width  - 1.f) * s->flat_range[0];

  1698.     const float y = ((2.f * j + 1.f) / height - 1.f) * s->flat_range[1];

  1699.     const float xy = x * x + y * y;

  1700. 

  1701.     vec[0] = 2.f * x / (1.f + xy);

  1702.     vec[1] = (-1.f + xy) / (1.f + xy);

  1703.     vec[2] = 2.f * y / (1.f + xy);

  1704. 

  1705.     normalize_vector(vec);

  1706. 

  1707.     return 1;

  1708. }

  1709. 

  1710. /**

  1711.  * Prepare data for processing stereographic input format.

  1712.  *

  1713.  * @param ctx filter context

  1714.  *

  1715.  * @return error code

  1716.  */

  1717. static int prepare_stereographic_in(AVFilterContext *ctx)

  1718. {

  1719.     V360Context *s = ctx->priv;

  1720. 

  1721.     s->iflat_range[0] = tanf(FFMIN(s->ih_fov, 359.f) * M_PI / 720.f);

  1722.     s->iflat_range[1] = tanf(FFMIN(s->iv_fov, 359.f) * M_PI / 720.f);

  1723. 

  1724.     return 0;

  1725. }

  1726. 

  1727. /**

  1728.  * Calculate frame position in stereographic format for corresponding 3D coordinates on sphere.

  1729.  *

  1730.  * @param s filter private context

  1731.  * @param vec coordinates on sphere

  1732.  * @param width frame width

  1733.  * @param height frame height

  1734.  * @param us horizontal coordinates for interpolation window

  1735.  * @param vs vertical coordinates for interpolation window

  1736.  * @param du horizontal relative coordinate

  1737.  * @param dv vertical relative coordinate

  1738.  */

  1739. static int xyz_to_stereographic(const V360Context *s,

  1740.                                 const float *vec, int width, int height,

  1741.                                 int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)

  1742. {

  1743.     const float x = vec[0] / (1.f - vec[1]) / s->iflat_range[0] * s->input_mirror_modifier[0];

  1744.     const float y = vec[2] / (1.f - vec[1]) / s->iflat_range[1] * s->input_mirror_modifier[1];

  1745. 

  1746.     const float uf = (x + 1.f) * width  / 2.f;

  1747.     const float vf = (y + 1.f) * height / 2.f;

  1748. 

  1749.     const int ui = floorf(uf);

  1750.     const int vi = floorf(vf);

  1751. 

  1752.     const int visible = isfinite(x) && isfinite(y) && vi >= 0 && vi < height && ui >= 0 && ui < width;

  1753. 

  1754.     *du = visible ? uf - ui : 0.f;

  1755.     *dv = visible ? vf - vi : 0.f;

  1756. 

  1757.     for (int i = 0; i < 4; i++) {

  1758.         for (int j = 0; j < 4; j++) {

  1759.             us[i][j] = visible ? av_clip(ui + j - 1, 0, width  - 1) : 0;

  1760.             vs[i][j] = visible ? av_clip(vi + i - 1, 0, height - 1) : 0;

  1761.         }

  1762.     }

  1763. 

  1764.     return visible;

  1765. }

  1766. 

  1767. /**

  1768.  * Calculate frame position in equirectangular format for corresponding 3D coordinates on sphere.

  1769.  *

  1770.  * @param s filter private context

  1771.  * @param vec coordinates on sphere

  1772.  * @param width frame width

  1773.  * @param height frame height

  1774.  * @param us horizontal coordinates for interpolation window

  1775.  * @param vs vertical coordinates for interpolation window

  1776.  * @param du horizontal relative coordinate

  1777.  * @param dv vertical relative coordinate

  1778.  */

  1779. static int xyz_to_equirect(const V360Context *s,

  1780.                            const float *vec, int width, int height,

  1781.                            int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)

  1782. {

  1783.     const float phi   = atan2f(vec[0], -vec[2]) * s->input_mirror_modifier[0];

  1784.     const float theta = asinf(-vec[1]) * s->input_mirror_modifier[1];

  1785. 

  1786.     const float uf = (phi   / M_PI   + 1.f) * width  / 2.f;

  1787.     const float vf = (theta / M_PI_2 + 1.f) * height / 2.f;

  1788. 

  1789.     const int ui = floorf(uf);

  1790.     const int vi = floorf(vf);

  1791. 

  1792.     *du = uf - ui;

  1793.     *dv = vf - vi;

  1794. 

  1795.     for (int i = 0; i < 4; i++) {

  1796.         for (int j = 0; j < 4; j++) {

  1797.             us[i][j] = ereflectx(ui + j - 1, vi + i - 1, width, height);

  1798.             vs[i][j] = reflecty(vi + i - 1, height);

  1799.         }

  1800.     }

  1801. 

  1802.     return 1;

  1803. }

  1804. 

  1805. /**

  1806.  * Calculate frame position in half equirectangular format for corresponding 3D coordinates on sphere.

  1807.  *

  1808.  * @param s filter private context

  1809.  * @param vec coordinates on sphere

  1810.  * @param width frame width

  1811.  * @param height frame height

  1812.  * @param us horizontal coordinates for interpolation window

  1813.  * @param vs vertical coordinates for interpolation window

  1814.  * @param du horizontal relative coordinate

  1815.  * @param dv vertical relative coordinate

  1816.  */

  1817. static int xyz_to_hequirect(const V360Context *s,

  1818.                             const float *vec, int width, int height,

  1819.                             int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)

  1820. {

  1821.     const float phi   = atan2f(vec[0], -vec[2]) * s->input_mirror_modifier[0];

  1822.     const float theta = asinf(-vec[1]) * s->input_mirror_modifier[1];

  1823. 

  1824.     const float uf = (phi   / M_PI_2 + 1.f) * width  / 2.f;

  1825.     const float vf = (theta / M_PI_2 + 1.f) * height / 2.f;

  1826. 

  1827.     const int ui = floorf(uf);

  1828.     const int vi = floorf(vf);

  1829. 

  1830.     const int visible = phi >= -M_PI_2 && phi <= M_PI_2;

  1831. 

  1832.     *du = uf - ui;

  1833.     *dv = vf - vi;

  1834. 

  1835.     for (int i = 0; i < 4; i++) {

  1836.         for (int j = 0; j < 4; j++) {

  1837.             us[i][j] = av_clip(ui + j - 1, 0, width  - 1);

  1838.             vs[i][j] = av_clip(vi + i - 1, 0, height - 1);

  1839.         }

  1840.     }

  1841. 

  1842.     return visible;

  1843. }

  1844. 

  1845. /**

  1846.  * Prepare data for processing flat input format.

  1847.  *

  1848.  * @param ctx filter context

  1849.  *

  1850.  * @return error code

  1851.  */

  1852. static int prepare_flat_in(AVFilterContext *ctx)

  1853. {

  1854.     V360Context *s = ctx->priv;

  1855. 

  1856.     s->iflat_range[0] = tanf(0.5f * s->ih_fov * M_PI / 180.f);

  1857.     s->iflat_range[1] = tanf(0.5f * s->iv_fov * M_PI / 180.f);

  1858. 

  1859.     return 0;

  1860. }

  1861. 

  1862. /**

  1863.  * Calculate frame position in flat format for corresponding 3D coordinates on sphere.

  1864.  *

  1865.  * @param s filter private context

  1866.  * @param vec coordinates on sphere

  1867.  * @param width frame width

  1868.  * @param height frame height

  1869.  * @param us horizontal coordinates for interpolation window

  1870.  * @param vs vertical coordinates for interpolation window

  1871.  * @param du horizontal relative coordinate

  1872.  * @param dv vertical relative coordinate

  1873.  */

  1874. static int xyz_to_flat(const V360Context *s,

  1875.                        const float *vec, int width, int height,

  1876.                        int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)

  1877. {

  1878.     const float theta = acosf(vec[2]);

  1879.     const float r = tanf(theta);

  1880.     const float rr = fabsf(r) < 1e+6f ? r : hypotf(width, height);

  1881.     const float zf = -vec[2];

  1882.     const float h = hypotf(vec[0], vec[1]);

  1883.     const float c = h <= 1e-6f ? 1.f : rr / h;

  1884.     float uf = -vec[0] * c / s->iflat_range[0] * s->input_mirror_modifier[0];

  1885.     float vf =  vec[1] * c / s->iflat_range[1] * s->input_mirror_modifier[1];

  1886.     int visible, ui, vi;

  1887. 

  1888.     uf = zf >= 0.f ? (uf + 1.f) * width  / 2.f : 0.f;

  1889.     vf = zf >= 0.f ? (vf + 1.f) * height / 2.f : 0.f;

  1890. 

  1891.     ui = floorf(uf);

  1892.     vi = floorf(vf);

  1893. 

  1894.     visible = vi >= 0 && vi < height && ui >= 0 && ui < width && zf >= 0.f;

  1895. 

  1896.     *du = uf - ui;

  1897.     *dv = vf - vi;

  1898. 

  1899.     for (int i = 0; i < 4; i++) {

  1900.         for (int j = 0; j < 4; j++) {

  1901.             us[i][j] = visible ? av_clip(ui + j - 1, 0, width  - 1) : 0;

  1902.             vs[i][j] = visible ? av_clip(vi + i - 1, 0, height - 1) : 0;

  1903.         }

  1904.     }

  1905. 

  1906.     return visible;

  1907. }

  1908. 

  1909. /**

  1910.  * Calculate frame position in mercator format for corresponding 3D coordinates on sphere.

  1911.  *

  1912.  * @param s filter private context

  1913.  * @param vec coordinates on sphere

  1914.  * @param width frame width

  1915.  * @param height frame height

  1916.  * @param us horizontal coordinates for interpolation window

  1917.  * @param vs vertical coordinates for interpolation window

  1918.  * @param du horizontal relative coordinate

  1919.  * @param dv vertical relative coordinate

  1920.  */

  1921. static int xyz_to_mercator(const V360Context *s,

  1922.                            const float *vec, int width, int height,

  1923.                            int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)

  1924. {

  1925.     const float phi   = atan2f(vec[0], -vec[2]) * s->input_mirror_modifier[0];

  1926.     const float theta = -vec[1] * s->input_mirror_modifier[1];

  1927. 

  1928.     const float uf = (phi / M_PI + 1.f) * width / 2.f;

  1929.     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;

  1930. 

  1931.     const int ui = floorf(uf);

  1932.     const int vi = floorf(vf);

  1933. 

  1934.     *du = uf - ui;

  1935.     *dv = vf - vi;

  1936. 

  1937.     for (int i = 0; i < 4; i++) {

  1938.         for (int j = 0; j < 4; j++) {

  1939.             us[i][j] = av_clip(ui + j - 1, 0, width  - 1);

  1940.             vs[i][j] = av_clip(vi + i - 1, 0, height - 1);

  1941.         }

  1942.     }

  1943. 

  1944.     return 1;

  1945. }

  1946. 

  1947. /**

  1948.  * Calculate 3D coordinates on sphere for corresponding frame position in mercator format.

  1949.  *

  1950.  * @param s filter private context

  1951.  * @param i horizontal position on frame [0, width)

  1952.  * @param j vertical position on frame [0, height)

  1953.  * @param width frame width

  1954.  * @param height frame height

  1955.  * @param vec coordinates on sphere

  1956.  */

  1957. static int mercator_to_xyz(const V360Context *s,

  1958.                            int i, int j, int width, int height,

  1959.                            float *vec)

  1960. {

  1961.     const float phi = ((2.f * i + 1.f) / width  - 1.f) * M_PI + M_PI_2;

  1962.     const float y   = ((2.f * j + 1.f) / height - 1.f) * M_PI;

  1963.     const float div = expf(2.f * y) + 1.f;

  1964. 

  1965.     const float sin_phi   = sinf(phi);

  1966.     const float cos_phi   = cosf(phi);

  1967.     const float sin_theta = -2.f * expf(y) / div;

  1968.     const float cos_theta = -(expf(2.f * y) - 1.f) / div;

  1969. 

  1970.     vec[0] = sin_theta * cos_phi;

  1971.     vec[1] = cos_theta;

  1972.     vec[2] = sin_theta * sin_phi;

  1973. 

  1974.     return 1;

  1975. }

  1976. 

  1977. /**

  1978.  * Calculate frame position in ball format for corresponding 3D coordinates on sphere.

  1979.  *

  1980.  * @param s filter private context

  1981.  * @param vec coordinates on sphere

  1982.  * @param width frame width

  1983.  * @param height frame height

  1984.  * @param us horizontal coordinates for interpolation window

  1985.  * @param vs vertical coordinates for interpolation window

  1986.  * @param du horizontal relative coordinate

  1987.  * @param dv vertical relative coordinate

  1988.  */

  1989. static int xyz_to_ball(const V360Context *s,

  1990.                        const float *vec, int width, int height,

  1991.                        int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)

  1992. {

  1993.     const float l = hypotf(vec[0], vec[1]);

  1994.     const float r = sqrtf(1.f + vec[2]) / M_SQRT2;

  1995. 

  1996.     const float uf = (1.f + r * vec[0] * s->input_mirror_modifier[0] / (l > 0.f ? l : 1.f)) * width  * 0.5f;

  1997.     const float vf = (1.f - r * vec[1] * s->input_mirror_modifier[1] / (l > 0.f ? l : 1.f)) * height * 0.5f;

  1998. 

  1999.     const int ui = floorf(uf);

  2000.     const int vi = floorf(vf);

  2001. 

  2002.     *du = uf - ui;

  2003.     *dv = vf - vi;

  2004. 

  2005.     for (int i = 0; i < 4; i++) {

  2006.         for (int j = 0; j < 4; j++) {

  2007.             us[i][j] = av_clip(ui + j - 1, 0, width  - 1);

  2008.             vs[i][j] = av_clip(vi + i - 1, 0, height - 1);

  2009.         }

  2010.     }

  2011. 

  2012.     return 1;

  2013. }

  2014. 

  2015. /**

  2016.  * Calculate 3D coordinates on sphere for corresponding frame position in ball format.

  2017.  *

  2018.  * @param s filter private context

  2019.  * @param i horizontal position on frame [0, width)

  2020.  * @param j vertical position on frame [0, height)

  2021.  * @param width frame width

  2022.  * @param height frame height

  2023.  * @param vec coordinates on sphere

  2024.  */

  2025. static int ball_to_xyz(const V360Context *s,

  2026.                        int i, int j, int width, int height,

  2027.                        float *vec)

  2028. {

  2029.     const float x = (2.f * i + 1.f) / width  - 1.f;

  2030.     const float y = (2.f * j + 1.f) / height - 1.f;

  2031.     const float l = hypotf(x, y);

  2032. 

  2033.     if (l <= 1.f) {

  2034.         const float z = 2.f * l * sqrtf(1.f - l * l);

  2035. 

  2036.         vec[0] =  z * x / (l > 0.f ? l : 1.f);

  2037.         vec[1] = -z * y / (l > 0.f ? l : 1.f);

  2038.         vec[2] = -1.f + 2.f * l * l;

  2039.     } else {

  2040.         vec[0] =  0.f;

  2041.         vec[1] = -1.f;

  2042.         vec[2] =  0.f;

  2043.         return 0;

  2044.     }

  2045. 

  2046.     return 1;

  2047. }

  2048. 

  2049. /**

  2050.  * Calculate 3D coordinates on sphere for corresponding frame position in hammer format.

  2051.  *

  2052.  * @param s filter private context

  2053.  * @param i horizontal position on frame [0, width)

  2054.  * @param j vertical position on frame [0, height)

  2055.  * @param width frame width

  2056.  * @param height frame height

  2057.  * @param vec coordinates on sphere

  2058.  */

  2059. static int hammer_to_xyz(const V360Context *s,

  2060.                          int i, int j, int width, int height,

  2061.                          float *vec)

  2062. {

  2063.     const float x = ((2.f * i + 1.f) / width  - 1.f);

  2064.     const float y = ((2.f * j + 1.f) / height - 1.f);

  2065. 

  2066.     const float xx = x * x;

  2067.     const float yy = y * y;

  2068. 

  2069.     const float z = sqrtf(1.f - xx * 0.5f - yy * 0.5f);

  2070. 

  2071.     const float a = M_SQRT2 * x * z;

  2072.     const float b = 2.f * z * z - 1.f;

  2073. 

  2074.     const float aa = a * a;

  2075.     const float bb = b * b;

  2076. 

  2077.     const float w = sqrtf(1.f - 2.f * yy * z * z);

  2078. 

  2079.     vec[0] =  w * 2.f * a * b / (aa + bb);

  2080.     vec[1] = -M_SQRT2 * y * z;

  2081.     vec[2] = -w * (bb  - aa) / (aa + bb);

  2082. 

  2083.     normalize_vector(vec);

  2084. 

  2085.     return 1;

  2086. }

  2087. 

  2088. /**

  2089.  * Calculate frame position in hammer format for corresponding 3D coordinates on sphere.

  2090.  *

  2091.  * @param s filter private context

  2092.  * @param vec coordinates on sphere

  2093.  * @param width frame width

  2094.  * @param height frame height

  2095.  * @param us horizontal coordinates for interpolation window

  2096.  * @param vs vertical coordinates for interpolation window

  2097.  * @param du horizontal relative coordinate

  2098.  * @param dv vertical relative coordinate

  2099.  */

  2100. static int xyz_to_hammer(const V360Context *s,

  2101.                          const float *vec, int width, int height,

  2102.                          int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)

  2103. {

  2104.     const float theta = atan2f(vec[0], -vec[2]) * s->input_mirror_modifier[0];

  2105. 

  2106.     const float z = sqrtf(1.f + sqrtf(1.f - vec[1] * vec[1]) * cosf(theta * 0.5f));

  2107.     const float x = sqrtf(1.f - vec[1] * vec[1]) * sinf(theta * 0.5f) / z;

  2108.     const float y = -vec[1] / z * s->input_mirror_modifier[1];

  2109. 

  2110.     const float uf = (x + 1.f) * width  / 2.f;

  2111.     const float vf = (y + 1.f) * height / 2.f;

  2112. 

  2113.     const int ui = floorf(uf);

  2114.     const int vi = floorf(vf);

  2115. 

  2116.     *du = uf - ui;

  2117.     *dv = vf - vi;

  2118. 

  2119.     for (int i = 0; i < 4; i++) {

  2120.         for (int j = 0; j < 4; j++) {

  2121.             us[i][j] = av_clip(ui + j - 1, 0, width  - 1);

  2122.             vs[i][j] = av_clip(vi + i - 1, 0, height - 1);

  2123.         }

  2124.     }

  2125. 

  2126.     return 1;

  2127. }

  2128. 

  2129. /**

  2130.  * Calculate 3D coordinates on sphere for corresponding frame position in sinusoidal format.

  2131.  *

  2132.  * @param s filter private context

  2133.  * @param i horizontal position on frame [0, width)

  2134.  * @param j vertical position on frame [0, height)

  2135.  * @param width frame width

  2136.  * @param height frame height

  2137.  * @param vec coordinates on sphere

  2138.  */

  2139. static int sinusoidal_to_xyz(const V360Context *s,

  2140.                              int i, int j, int width, int height,

  2141.                              float *vec)

  2142. {

  2143.     const float theta = ((2.f * j + 1.f) / height - 1.f) * M_PI_2;

  2144.     const float phi   = ((2.f * i + 1.f) / width  - 1.f) * M_PI / cosf(theta);

  2145. 

  2146.     const float sin_phi   = sinf(phi);

  2147.     const float cos_phi   = cosf(phi);

  2148.     const float sin_theta = sinf(theta);

  2149.     const float cos_theta = cosf(theta);

  2150. 

  2151.     vec[0] =  cos_theta * sin_phi;

  2152.     vec[1] = -sin_theta;

  2153.     vec[2] = -cos_theta * cos_phi;

  2154. 

  2155.     normalize_vector(vec);

  2156. 

  2157.     return 1;

  2158. }

  2159. 

  2160. /**

  2161.  * Calculate frame position in sinusoidal format for corresponding 3D coordinates on sphere.

  2162.  *

  2163.  * @param s filter private context

  2164.  * @param vec coordinates on sphere

  2165.  * @param width frame width

  2166.  * @param height frame height

  2167.  * @param us horizontal coordinates for interpolation window

  2168.  * @param vs vertical coordinates for interpolation window

  2169.  * @param du horizontal relative coordinate

  2170.  * @param dv vertical relative coordinate

  2171.  */

  2172. static int xyz_to_sinusoidal(const V360Context *s,

  2173.                              const float *vec, int width, int height,

  2174.                              int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)

  2175. {

  2176.     const float theta = asinf(-vec[1]) * s->input_mirror_modifier[1];

  2177.     const float phi   = atan2f(vec[0], -vec[2]) * s->input_mirror_modifier[0] * cosf(theta);

  2178. 

  2179.     const float uf = (phi   / M_PI   + 1.f) * width  / 2.f;

  2180.     const float vf = (theta / M_PI_2 + 1.f) * height / 2.f;

  2181. 

  2182.     const int ui = floorf(uf);

  2183.     const int vi = floorf(vf);

  2184. 

  2185.     *du = uf - ui;

  2186.     *dv = vf - vi;

  2187. 

  2188.     for (int i = 0; i < 4; i++) {

  2189.         for (int j = 0; j < 4; j++) {

  2190.             us[i][j] = av_clip(ui + j - 1, 0, width  - 1);

  2191.             vs[i][j] = av_clip(vi + i - 1, 0, height - 1);

  2192.         }

  2193.     }

  2194. 

  2195.     return 1;

  2196. }

  2197. 

  2198. /**

  2199.  * Prepare data for processing equi-angular cubemap input format.

  2200.  *

  2201.  * @param ctx filter context

  2202.  *

  2203.  * @return error code

  2204.  */

  2205. static int prepare_eac_in(AVFilterContext *ctx)

  2206. {

  2207.     V360Context *s = ctx->priv;

  2208. 

  2209.     if (s->ih_flip && s->iv_flip) {

  2210.         s->in_cubemap_face_order[RIGHT] = BOTTOM_LEFT;

  2211.         s->in_cubemap_face_order[LEFT]  = BOTTOM_RIGHT;

  2212.         s->in_cubemap_face_order[UP]    = TOP_LEFT;

  2213.         s->in_cubemap_face_order[DOWN]  = TOP_RIGHT;

  2214.         s->in_cubemap_face_order[FRONT] = BOTTOM_MIDDLE;

  2215.         s->in_cubemap_face_order[BACK]  = TOP_MIDDLE;

  2216.     } else if (s->ih_flip) {

  2217.         s->in_cubemap_face_order[RIGHT] = TOP_LEFT;

  2218.         s->in_cubemap_face_order[LEFT]  = TOP_RIGHT;

  2219.         s->in_cubemap_face_order[UP]    = BOTTOM_LEFT;

  2220.         s->in_cubemap_face_order[DOWN]  = BOTTOM_RIGHT;

  2221.         s->in_cubemap_face_order[FRONT] = TOP_MIDDLE;

  2222.         s->in_cubemap_face_order[BACK]  = BOTTOM_MIDDLE;

  2223.     } else if (s->iv_flip) {

  2224.         s->in_cubemap_face_order[RIGHT] = BOTTOM_RIGHT;

  2225.         s->in_cubemap_face_order[LEFT]  = BOTTOM_LEFT;

  2226.         s->in_cubemap_face_order[UP]    = TOP_RIGHT;

  2227.         s->in_cubemap_face_order[DOWN]  = TOP_LEFT;

  2228.         s->in_cubemap_face_order[FRONT] = BOTTOM_MIDDLE;

  2229.         s->in_cubemap_face_order[BACK]  = TOP_MIDDLE;

  2230.     } else {

  2231.         s->in_cubemap_face_order[RIGHT] = TOP_RIGHT;

  2232.         s->in_cubemap_face_order[LEFT]  = TOP_LEFT;

  2233.         s->in_cubemap_face_order[UP]    = BOTTOM_RIGHT;

  2234.         s->in_cubemap_face_order[DOWN]  = BOTTOM_LEFT;

  2235.         s->in_cubemap_face_order[FRONT] = TOP_MIDDLE;

  2236.         s->in_cubemap_face_order[BACK]  = BOTTOM_MIDDLE;

  2237.     }

  2238. 

  2239.     if (s->iv_flip) {

  2240.         s->in_cubemap_face_rotation[TOP_LEFT]      = ROT_270;

  2241.         s->in_cubemap_face_rotation[TOP_MIDDLE]    = ROT_90;

  2242.         s->in_cubemap_face_rotation[TOP_RIGHT]     = ROT_270;

  2243.         s->in_cubemap_face_rotation[BOTTOM_LEFT]   = ROT_0;

  2244.         s->in_cubemap_face_rotation[BOTTOM_MIDDLE] = ROT_0;

  2245.         s->in_cubemap_face_rotation[BOTTOM_RIGHT]  = ROT_0;

  2246.     } else {

  2247.         s->in_cubemap_face_rotation[TOP_LEFT]      = ROT_0;

  2248.         s->in_cubemap_face_rotation[TOP_MIDDLE]    = ROT_0;

  2249.         s->in_cubemap_face_rotation[TOP_RIGHT]     = ROT_0;

  2250.         s->in_cubemap_face_rotation[BOTTOM_LEFT]   = ROT_270;

  2251.         s->in_cubemap_face_rotation[BOTTOM_MIDDLE] = ROT_90;

  2252.         s->in_cubemap_face_rotation[BOTTOM_RIGHT]  = ROT_270;

  2253.     }

  2254. 

  2255.     return 0;

  2256. }

  2257. 

  2258. /**

  2259.  * Prepare data for processing equi-angular cubemap output format.

  2260.  *

  2261.  * @param ctx filter context

  2262.  *

  2263.  * @return error code

  2264.  */

  2265. static int prepare_eac_out(AVFilterContext *ctx)

  2266. {

  2267.     V360Context *s = ctx->priv;

  2268. 

  2269.     s->out_cubemap_direction_order[TOP_LEFT]      = LEFT;

  2270.     s->out_cubemap_direction_order[TOP_MIDDLE]    = FRONT;

  2271.     s->out_cubemap_direction_order[TOP_RIGHT]     = RIGHT;

  2272.     s->out_cubemap_direction_order[BOTTOM_LEFT]   = DOWN;

  2273.     s->out_cubemap_direction_order[BOTTOM_MIDDLE] = BACK;

  2274.     s->out_cubemap_direction_order[BOTTOM_RIGHT]  = UP;

  2275. 

  2276.     s->out_cubemap_face_rotation[TOP_LEFT]      = ROT_0;

  2277.     s->out_cubemap_face_rotation[TOP_MIDDLE]    = ROT_0;

  2278.     s->out_cubemap_face_rotation[TOP_RIGHT]     = ROT_0;

  2279.     s->out_cubemap_face_rotation[BOTTOM_LEFT]   = ROT_270;

  2280.     s->out_cubemap_face_rotation[BOTTOM_MIDDLE] = ROT_90;

  2281.     s->out_cubemap_face_rotation[BOTTOM_RIGHT]  = ROT_270;

  2282. 

  2283.     return 0;

  2284. }

  2285. 

  2286. /**

  2287.  * Calculate 3D coordinates on sphere for corresponding frame position in equi-angular cubemap format.

  2288.  *

  2289.  * @param s filter private context

  2290.  * @param i horizontal position on frame [0, width)

  2291.  * @param j vertical position on frame [0, height)

  2292.  * @param width frame width

  2293.  * @param height frame height

  2294.  * @param vec coordinates on sphere

  2295.  */

  2296. static int eac_to_xyz(const V360Context *s,

  2297.                       int i, int j, int width, int height,

  2298.                       float *vec)

  2299. {

  2300.     const float pixel_pad = 2;

  2301.     const float u_pad = pixel_pad / width;

  2302.     const float v_pad = pixel_pad / height;

  2303. 

  2304.     int u_face, v_face, face;

  2305. 

  2306.     float l_x, l_y, l_z;

  2307. 

  2308.     float uf = (i + 0.5f) / width;

  2309.     float vf = (j + 0.5f) / height;

  2310. 

  2311.     // EAC has 2-pixel padding on faces except between faces on the same row

  2312.     // Padding pixels seems not to be stretched with tangent as regular pixels

  2313.     // Formulas below approximate original padding as close as I could get experimentally

  2314. 

  2315.     // Horizontal padding

  2316.     uf = 3.f * (uf - u_pad) / (1.f - 2.f * u_pad);

  2317.     if (uf < 0.f) {

  2318.         u_face = 0;

  2319.         uf -= 0.5f;

  2320.     } else if (uf >= 3.f) {

  2321.         u_face = 2;

  2322.         uf -= 2.5f;

  2323.     } else {

  2324.         u_face = floorf(uf);

  2325.         uf = fmodf(uf, 1.f) - 0.5f;

  2326.     }

  2327. 

  2328.     // Vertical padding

  2329.     v_face = floorf(vf * 2.f);

  2330.     vf = (vf - v_pad - 0.5f * v_face) / (0.5f - 2.f * v_pad) - 0.5f;

  2331. 

  2332.     if (uf >= -0.5f && uf < 0.5f) {

  2333.         uf = tanf(M_PI_2 * uf);

  2334.     } else {

  2335.         uf = 2.f * uf;

  2336.     }

  2337.     if (vf >= -0.5f && vf < 0.5f) {

  2338.         vf = tanf(M_PI_2 * vf);

  2339.     } else {

  2340.         vf = 2.f * vf;

  2341.     }

  2342. 

  2343.     face = u_face + 3 * v_face;

  2344. 

  2345.     switch (face) {

  2346.     case TOP_LEFT:

  2347.         l_x = -1.f;

  2348.         l_y = -vf;

  2349.         l_z = -uf;

  2350.         break;

  2351.     case TOP_MIDDLE:

  2352.         l_x =  uf;

  2353.         l_y = -vf;

  2354.         l_z = -1.f;

  2355.         break;

  2356.     case TOP_RIGHT:

  2357.         l_x =  1.f;

  2358.         l_y = -vf;

  2359.         l_z =  uf;

  2360.         break;

  2361.     case BOTTOM_LEFT:

  2362.         l_x = -vf;

  2363.         l_y = -1.f;

  2364.         l_z =  uf;

  2365.         break;

  2366.     case BOTTOM_MIDDLE:

  2367.         l_x = -vf;

  2368.         l_y =  uf;

  2369.         l_z =  1.f;

  2370.         break;

  2371.     case BOTTOM_RIGHT:

  2372.         l_x = -vf;

  2373.         l_y =  1.f;

  2374.         l_z = -uf;

  2375.         break;

  2376.     default:

  2377.         av_assert0(0);

  2378.     }

  2379. 

  2380.     vec[0] = l_x;

  2381.     vec[1] = l_y;

  2382.     vec[2] = l_z;

  2383. 

  2384.     normalize_vector(vec);

  2385. 

  2386.     return 1;

  2387. }

  2388. 

  2389. /**

  2390.  * Calculate frame position in equi-angular cubemap format for corresponding 3D coordinates on sphere.

  2391.  *

  2392.  * @param s filter private context

  2393.  * @param vec coordinates on sphere

  2394.  * @param width frame width

  2395.  * @param height frame height

  2396.  * @param us horizontal coordinates for interpolation window

  2397.  * @param vs vertical coordinates for interpolation window

  2398.  * @param du horizontal relative coordinate

  2399.  * @param dv vertical relative coordinate

  2400.  */

  2401. static int xyz_to_eac(const V360Context *s,

  2402.                       const float *vec, int width, int height,

  2403.                       int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)

  2404. {

  2405.     const float pixel_pad = 2;

  2406.     const float u_pad = pixel_pad / width;

  2407.     const float v_pad = pixel_pad / height;

  2408. 

  2409.     float uf, vf;

  2410.     int ui, vi;

  2411.     int direction, face;

  2412.     int u_face, v_face;

  2413. 

  2414.     xyz_to_cube(s, vec, &uf, &vf, &direction);

  2415. 

  2416.     face = s->in_cubemap_face_order[direction];

  2417.     u_face = face % 3;

  2418.     v_face = face / 3;

  2419. 

  2420.     uf = M_2_PI * atanf(uf) + 0.5f;

  2421.     vf = M_2_PI * atanf(vf) + 0.5f;

  2422. 

  2423.     // These formulas are inversed from eac_to_xyz ones

  2424.     uf = (uf + u_face) * (1.f - 2.f * u_pad) / 3.f + u_pad;

  2425.     vf = vf * (0.5f - 2.f * v_pad) + v_pad + 0.5f * v_face;

  2426. 

  2427.     uf *= width;

  2428.     vf *= height;

  2429. 

  2430.     uf -= 0.5f;

  2431.     vf -= 0.5f;

  2432. 

  2433.     ui = floorf(uf);

  2434.     vi = floorf(vf);

  2435. 

  2436.     *du = uf - ui;

  2437.     *dv = vf - vi;

  2438. 

  2439.     for (int i = 0; i < 4; i++) {

  2440.         for (int j = 0; j < 4; j++) {

  2441.             us[i][j] = av_clip(ui + j - 1, 0, width  - 1);

  2442.             vs[i][j] = av_clip(vi + i - 1, 0, height - 1);

  2443.         }

  2444.     }

  2445. 

  2446.     return 1;

  2447. }

  2448. 

  2449. /**

  2450.  * Prepare data for processing flat output format.

  2451.  *

  2452.  * @param ctx filter context

  2453.  *

  2454.  * @return error code

  2455.  */

  2456. static int prepare_flat_out(AVFilterContext *ctx)

  2457. {

  2458.     V360Context *s = ctx->priv;

  2459. 

  2460.     s->flat_range[0] = tanf(0.5f * s->h_fov * M_PI / 180.f);

  2461.     s->flat_range[1] = tanf(0.5f * s->v_fov * M_PI / 180.f);

  2462. 

  2463.     return 0;

  2464. }

  2465. 

  2466. /**

  2467.  * Calculate 3D coordinates on sphere for corresponding frame position in flat format.

  2468.  *

  2469.  * @param s filter private context

  2470.  * @param i horizontal position on frame [0, width)

  2471.  * @param j vertical position on frame [0, height)

  2472.  * @param width frame width

  2473.  * @param height frame height

  2474.  * @param vec coordinates on sphere

  2475.  */

  2476. static int flat_to_xyz(const V360Context *s,

  2477.                        int i, int j, int width, int height,

  2478.                        float *vec)

  2479. {

  2480.     const float l_x =  s->flat_range[0] * ((2.f * i + 0.5f) / width  - 1.f);

  2481.     const float l_y = -s->flat_range[1] * ((2.f * j + 0.5f) / height - 1.f);

  2482. 

  2483.     vec[0] =  l_x;

  2484.     vec[1] =  l_y;

  2485.     vec[2] = -1.f;

  2486. 

  2487.     normalize_vector(vec);

  2488. 

  2489.     return 1;

  2490. }

  2491. 

  2492. /**

  2493.  * Prepare data for processing fisheye output format.

  2494.  *

  2495.  * @param ctx filter context

  2496.  *

  2497.  * @return error code

  2498.  */

  2499. static int prepare_fisheye_out(AVFilterContext *ctx)

  2500. {

  2501.     V360Context *s = ctx->priv;

  2502. 

  2503.     s->flat_range[0] = s->h_fov / 180.f;

  2504.     s->flat_range[1] = s->v_fov / 180.f;

  2505. 

  2506.     return 0;

  2507. }

  2508. 

  2509. /**

  2510.  * Calculate 3D coordinates on sphere for corresponding frame position in fisheye format.

  2511.  *

  2512.  * @param s filter private context

  2513.  * @param i horizontal position on frame [0, width)

  2514.  * @param j vertical position on frame [0, height)

  2515.  * @param width frame width

  2516.  * @param height frame height

  2517.  * @param vec coordinates on sphere

  2518.  */

  2519. static int fisheye_to_xyz(const V360Context *s,

  2520.                           int i, int j, int width, int height,

  2521.                           float *vec)

  2522. {

  2523.     const float uf = s->flat_range[0] * ((2.f * i) / width  - 1.f);

  2524.     const float vf = s->flat_range[1] * ((2.f * j + 1.f) / height - 1.f);

  2525. 

  2526.     const float phi   = -atan2f(vf, uf);

  2527.     const float theta = -M_PI_2 * (1.f - hypotf(uf, vf));

  2528. 

  2529.     vec[0] = cosf(theta) * cosf(phi);

  2530.     vec[1] = cosf(theta) * sinf(phi);

  2531.     vec[2] = sinf(theta);

  2532. 

  2533.     normalize_vector(vec);

  2534. 

  2535.     return 1;

  2536. }

  2537. 

  2538. /**

  2539.  * Prepare data for processing fisheye input format.

  2540.  *

  2541.  * @param ctx filter context

  2542.  *

  2543.  * @return error code

  2544.  */

  2545. static int prepare_fisheye_in(AVFilterContext *ctx)

  2546. {

  2547.     V360Context *s = ctx->priv;

  2548. 

  2549.     s->iflat_range[0] = s->ih_fov / 180.f;

  2550.     s->iflat_range[1] = s->iv_fov / 180.f;

  2551. 

  2552.     return 0;

  2553. }

  2554. 

  2555. /**

  2556.  * Calculate frame position in fisheye format for corresponding 3D coordinates on sphere.

  2557.  *

  2558.  * @param s filter private context

  2559.  * @param vec coordinates on sphere

  2560.  * @param width frame width

  2561.  * @param height frame height

  2562.  * @param us horizontal coordinates for interpolation window

  2563.  * @param vs vertical coordinates for interpolation window

  2564.  * @param du horizontal relative coordinate

  2565.  * @param dv vertical relative coordinate

  2566.  */

  2567. static int xyz_to_fisheye(const V360Context *s,

  2568.                           const float *vec, int width, int height,

  2569.                           int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)

  2570. {

  2571.     const float h   = hypotf(vec[0], vec[1]);

  2572.     const float lh  = h > 0.f ? h : 1.f;

  2573.     const float phi = atan2f(h, -vec[2]) / M_PI;

  2574. 

  2575.     float uf =  vec[0] / lh * phi * s->input_mirror_modifier[0] / s->iflat_range[0];

  2576.     float vf = -vec[1] / lh * phi * s->input_mirror_modifier[1] / s->iflat_range[1];

  2577. 

  2578.     const int visible = hypotf(uf, vf) <= 0.5f;

  2579.     int ui, vi;

  2580. 

  2581.     uf = (uf + 0.5f) * width;

  2582.     vf = (vf + 0.5f) * height;

  2583. 

  2584.     ui = floorf(uf);

  2585.     vi = floorf(vf);

  2586. 

  2587.     *du = visible ? uf - ui : 0.f;

  2588.     *dv = visible ? vf - vi : 0.f;

  2589. 

  2590.     for (int i = 0; i < 4; i++) {

  2591.         for (int j = 0; j < 4; j++) {

  2592.             us[i][j] = visible ? av_clip(ui + j - 1, 0, width  - 1) : 0;

  2593.             vs[i][j] = visible ? av_clip(vi + i - 1, 0, height - 1) : 0;

  2594.         }

  2595.     }

  2596. 

  2597.     return visible;

  2598. }

  2599. 

  2600. /**

  2601.  * Calculate 3D coordinates on sphere for corresponding frame position in pannini format.

  2602.  *

  2603.  * @param s filter private context

  2604.  * @param i horizontal position on frame [0, width)

  2605.  * @param j vertical position on frame [0, height)

  2606.  * @param width frame width

  2607.  * @param height frame height

  2608.  * @param vec coordinates on sphere

  2609.  */

  2610. static int pannini_to_xyz(const V360Context *s,

  2611.                           int i, int j, int width, int height,

  2612.                           float *vec)

  2613. {

  2614.     const float uf = ((2.f * i + 1.f) / width  - 1.f);

  2615.     const float vf = ((2.f * j + 1.f) / height - 1.f);

  2616. 

  2617.     const float d = s->h_fov;

  2618.     const float k = uf * uf / ((d + 1.f) * (d + 1.f));

  2619.     const float dscr = k * k * d * d - (k + 1.f) * (k * d * d - 1.f);

  2620.     const float clon = (-k * d + sqrtf(dscr)) / (k + 1.f);

  2621.     const float S = (d + 1.f) / (d + clon);

  2622.     const float lon = -(M_PI + atan2f(uf, S * clon));

  2623.     const float lat = -atan2f(vf, S);

  2624. 

  2625.     vec[0] = sinf(lon) * cosf(lat);

  2626.     vec[1] = sinf(lat);

  2627.     vec[2] = cosf(lon) * cosf(lat);

  2628. 

  2629.     normalize_vector(vec);

  2630. 

  2631.     return 1;

  2632. }

  2633. 

  2634. /**

  2635.  * Prepare data for processing cylindrical output format.

  2636.  *

  2637.  * @param ctx filter context

  2638.  *

  2639.  * @return error code

  2640.  */

  2641. static int prepare_cylindrical_out(AVFilterContext *ctx)

  2642. {

  2643.     V360Context *s = ctx->priv;

  2644. 

  2645.     s->flat_range[0] = M_PI * s->h_fov / 360.f;

  2646.     s->flat_range[1] = tanf(0.5f * s->v_fov * M_PI / 180.f);

  2647. 

  2648.     return 0;

  2649. }

  2650. 

  2651. /**

  2652.  * Calculate 3D coordinates on sphere for corresponding frame position in cylindrical format.

  2653.  *

  2654.  * @param s filter private context

  2655.  * @param i horizontal position on frame [0, width)

  2656.  * @param j vertical position on frame [0, height)

  2657.  * @param width frame width

  2658.  * @param height frame height

  2659.  * @param vec coordinates on sphere

  2660.  */

  2661. static int cylindrical_to_xyz(const V360Context *s,

  2662.                               int i, int j, int width, int height,

  2663.                               float *vec)

  2664. {

  2665.     const float uf = s->flat_range[0] * ((2.f * i + 1.f) / width  - 1.f);

  2666.     const float vf = s->flat_range[1] * ((2.f * j + 1.f) / height - 1.f);

  2667. 

  2668.     const float phi   = uf;

  2669.     const float theta = atanf(vf);

  2670. 

  2671.     const float sin_phi   = sinf(phi);

  2672.     const float cos_phi   = cosf(phi);

  2673.     const float sin_theta = sinf(theta);

  2674.     const float cos_theta = cosf(theta);

  2675. 

  2676.     vec[0] =  cos_theta * sin_phi;

  2677.     vec[1] = -sin_theta;

  2678.     vec[2] = -cos_theta * cos_phi;

  2679. 

  2680.     normalize_vector(vec);

  2681. 

  2682.     return 1;

  2683. }

  2684. 

  2685. /**

  2686.  * Prepare data for processing cylindrical input format.

  2687.  *

  2688.  * @param ctx filter context

  2689.  *

  2690.  * @return error code

  2691.  */

  2692. static int prepare_cylindrical_in(AVFilterContext *ctx)

  2693. {

  2694.     V360Context *s = ctx->priv;

  2695. 

  2696.     s->iflat_range[0] = M_PI * s->ih_fov / 360.f;

  2697.     s->iflat_range[1] = tanf(0.5f * s->iv_fov * M_PI / 180.f);

  2698. 

  2699.     return 0;

  2700. }

  2701. 

  2702. /**

  2703.  * Calculate frame position in cylindrical format for corresponding 3D coordinates on sphere.

  2704.  *

  2705.  * @param s filter private context

  2706.  * @param vec coordinates on sphere

  2707.  * @param width frame width

  2708.  * @param height frame height

  2709.  * @param us horizontal coordinates for interpolation window

  2710.  * @param vs vertical coordinates for interpolation window

  2711.  * @param du horizontal relative coordinate

  2712.  * @param dv vertical relative coordinate

  2713.  */

  2714. static int xyz_to_cylindrical(const V360Context *s,

  2715.                               const float *vec, int width, int height,

  2716.                               int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)

  2717. {

  2718.     const float phi   = atan2f(vec[0], -vec[2]) * s->input_mirror_modifier[0] / s->iflat_range[0];

  2719.     const float theta = asinf(-vec[1]) * s->input_mirror_modifier[1];

  2720. 

  2721.     const float uf = (phi + 1.f) * (width - 1) / 2.f;

  2722.     const float vf = (tanf(theta) / s->iflat_range[1] + 1.f) * height / 2.f;

  2723. 

  2724.     const int ui = floorf(uf);

  2725.     const int vi = floorf(vf);

  2726. 

  2727.     const int visible = vi >= 0 && vi < height && ui >= 0 && ui < width &&

  2728.                         theta <=  M_PI * s->iv_fov / 180.f &&

  2729.                         theta >= -M_PI * s->iv_fov / 180.f;

  2730. 

  2731.     *du = uf - ui;

  2732.     *dv = vf - vi;

  2733. 

  2734.     for (int i = 0; i < 4; i++) {

  2735.         for (int j = 0; j < 4; j++) {

  2736.             us[i][j] = visible ? av_clip(ui + j - 1, 0, width  - 1) : 0;

  2737.             vs[i][j] = visible ? av_clip(vi + i - 1, 0, height - 1) : 0;

  2738.         }

  2739.     }

  2740. 

  2741.     return visible;

  2742. }

  2743. 

  2744. /**

  2745.  * Calculate 3D coordinates on sphere for corresponding frame position in perspective format.

  2746.  *

  2747.  * @param s filter private context

  2748.  * @param i horizontal position on frame [0, width)

  2749.  * @param j vertical position on frame [0, height)

  2750.  * @param width frame width

  2751.  * @param height frame height

  2752.  * @param vec coordinates on sphere

  2753.  */

  2754. static int perspective_to_xyz(const V360Context *s,

  2755.                               int i, int j, int width, int height,

  2756.                               float *vec)

  2757. {

  2758.     const float uf = ((2.f * i + 1.f) / width  - 1.f);

  2759.     const float vf = ((2.f * j + 1.f) / height - 1.f);

  2760.     const float rh = hypotf(uf, vf);

  2761.     const float sinzz = 1.f - rh * rh;

  2762.     const float h = 1.f + s->v_fov;

  2763.     const float sinz = (h - sqrtf(sinzz)) / (h / rh + rh / h);

  2764.     const float sinz2 = sinz * sinz;

  2765. 

  2766.     if (sinz2 <= 1.f) {

  2767.         const float cosz = sqrtf(1.f - sinz2);

  2768. 

  2769.         const float theta = asinf(cosz);

  2770.         const float phi   = atan2f(uf, vf);

  2771. 

  2772.         const float sin_phi   = sinf(phi);

  2773.         const float cos_phi   = cosf(phi);

  2774.         const float sin_theta = sinf(theta);

  2775.         const float cos_theta = cosf(theta);

  2776. 

  2777.         vec[0] =  cos_theta * sin_phi;

  2778.         vec[1] =  sin_theta;

  2779.         vec[2] = -cos_theta * cos_phi;

  2780.     } else {

  2781.         vec[0] =  0.f;

  2782.         vec[1] = -1.f;

  2783.         vec[2] =  0.f;

  2784.         return 0;

  2785.     }

  2786. 

  2787.     normalize_vector(vec);

  2788.     return 1;

  2789. }

  2790. 

  2791. /**

  2792.  * Calculate 3D coordinates on sphere for corresponding frame position in tetrahedron format.

  2793.  *

  2794.  * @param s filter private context

  2795.  * @param i horizontal position on frame [0, width)

  2796.  * @param j vertical position on frame [0, height)

  2797.  * @param width frame width

  2798.  * @param height frame height

  2799.  * @param vec coordinates on sphere

  2800.  */

  2801. static int tetrahedron_to_xyz(const V360Context *s,

  2802.                               int i, int j, int width, int height,

  2803.                               float *vec)

  2804. {

  2805.     const float uf = (float)i / width;

  2806.     const float vf = (float)j / height;

  2807. 

  2808.     vec[0] = uf < 0.5f ? uf * 4.f - 1.f : 3.f - uf * 4.f;

  2809.     vec[1] = 1.f - vf * 2.f;

  2810.     vec[2] = 2.f * fabsf(1.f - fabsf(1.f - uf * 2.f + vf)) - 1.f;

  2811. 

  2812.     normalize_vector(vec);

  2813. 

  2814.     return 1;

  2815. }

  2816. 

  2817. /**

  2818.  * Calculate frame position in tetrahedron format for corresponding 3D coordinates on sphere.

  2819.  *

  2820.  * @param s filter private context

  2821.  * @param vec coordinates on sphere

  2822.  * @param width frame width

  2823.  * @param height frame height

  2824.  * @param us horizontal coordinates for interpolation window

  2825.  * @param vs vertical coordinates for interpolation window

  2826.  * @param du horizontal relative coordinate

  2827.  * @param dv vertical relative coordinate

  2828.  */

  2829. static int xyz_to_tetrahedron(const V360Context *s,

  2830.                               const float *vec, int width, int height,

  2831.                               int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)

  2832. {

  2833.     const float d0 = vec[0] * 1.f + vec[1] * 1.f + vec[2] *-1.f;

  2834.     const float d1 = vec[0] *-1.f + vec[1] *-1.f + vec[2] *-1.f;

  2835.     const float d2 = vec[0] * 1.f + vec[1] *-1.f + vec[2] * 1.f;

  2836.     const float d3 = vec[0] *-1.f + vec[1] * 1.f + vec[2] * 1.f;

  2837.     const float d = FFMAX(d0, FFMAX3(d1, d2, d3));

  2838. 

  2839.     float uf, vf, x, y, z;

  2840.     int ui, vi;

  2841. 

  2842.     x =  vec[0] / d;

  2843.     y =  vec[1] / d;

  2844.     z = -vec[2] / d;

  2845. 

  2846.     vf = 0.5f - y * 0.5f * s->input_mirror_modifier[1];

  2847. 

  2848.     if ((x + y >= 0.f &&  y + z >= 0.f && -z - x <= 0.f) ||

  2849.         (x + y <= 0.f && -y + z >= 0.f &&  z - x >= 0.f)) {

  2850.         uf = 0.25f * x * s->input_mirror_modifier[0] + 0.25f;

  2851.     }  else {

  2852.         uf = 0.75f - 0.25f * x * s->input_mirror_modifier[0];

  2853.     }

  2854. 

  2855.     uf *= width;

  2856.     vf *= height;

  2857. 

  2858.     ui = floorf(uf);

  2859.     vi = floorf(vf);

  2860. 

  2861.     *du = uf - ui;

  2862.     *dv = vf - vi;

  2863. 

  2864.     for (int i = 0; i < 4; i++) {

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

  2866.             us[i][j] = reflectx(ui + j - 1, vi + i - 1, width, height);

  2867.             vs[i][j] = reflecty(vi + i - 1, height);

  2868.         }

  2869.     }

  2870. 

  2871.     return 1;

  2872. }

  2873. 

  2874. /**

  2875.  * Calculate 3D coordinates on sphere for corresponding frame position in dual fisheye format.

  2876.  *

  2877.  * @param s filter private context

  2878.  * @param i horizontal position on frame [0, width)

  2879.  * @param j vertical position on frame [0, height)

  2880.  * @param width frame width

  2881.  * @param height frame height

  2882.  * @param vec coordinates on sphere

  2883.  */

  2884. static int dfisheye_to_xyz(const V360Context *s,

  2885.                            int i, int j, int width, int height,

  2886.                            float *vec)

  2887. {

  2888.     const float scale = 1.f + s->out_pad;

  2889. 

  2890.     const float ew = width / 2.f;

  2891.     const float eh = height;

  2892. 

  2893.     const int ei = i >= ew ? i - ew : i;

  2894.     const float m = i >= ew ? -1.f : 1.f;

  2895. 

  2896.     const float uf = ((2.f * ei) / ew - 1.f) * scale;

  2897.     const float vf = ((2.f * j + 1.f) / eh - 1.f) * scale;

  2898. 

  2899.     const float h     = hypotf(uf, vf);

  2900.     const float lh    = h > 0.f ? h : 1.f;

  2901.     const float theta = m * M_PI_2 * (1.f - h);

  2902. 

  2903.     const float sin_theta = sinf(theta);

  2904.     const float cos_theta = cosf(theta);

  2905. 

  2906.     vec[0] = cos_theta * m * -uf / lh;

  2907.     vec[1] = cos_theta *     -vf / lh;

  2908.     vec[2] = sin_theta;

  2909. 

  2910.     normalize_vector(vec);

  2911. 

  2912.     return 1;

  2913. }

  2914. 

  2915. /**

  2916.  * Calculate frame position in dual fisheye format for corresponding 3D coordinates on sphere.

  2917.  *

  2918.  * @param s filter private context

  2919.  * @param vec coordinates on sphere

  2920.  * @param width frame width

  2921.  * @param height frame height

  2922.  * @param us horizontal coordinates for interpolation window

  2923.  * @param vs vertical coordinates for interpolation window

  2924.  * @param du horizontal relative coordinate

  2925.  * @param dv vertical relative coordinate

  2926.  */

  2927. static int xyz_to_dfisheye(const V360Context *s,

  2928.                            const float *vec, int width, int height,

  2929.                            int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)

  2930. {

  2931.     const float scale = 1.f - s->in_pad;

  2932. 

  2933.     const float ew = width / 2.f;

  2934.     const float eh = height;

  2935. 

  2936.     const float h     = hypotf(vec[0], vec[1]);

  2937.     const float lh    = h > 0.f ? h : 1.f;

  2938.     const float theta = acosf(fabsf(vec[2])) / M_PI;

  2939. 

  2940.     float uf = (theta * (-vec[0] / lh) * s->input_mirror_modifier[0] * scale + 0.5f) * ew;

  2941.     float vf = (theta * (-vec[1] / lh) * s->input_mirror_modifier[1] * scale + 0.5f) * eh;

  2942. 

  2943.     int ui, vi;

  2944.     int u_shift;

  2945. 

  2946.     if (vec[2] >= 0.f) {

  2947.         u_shift = 0;

  2948.     } else {

  2949.         u_shift = ceilf(ew);

  2950.         uf = ew - uf;

  2951.     }

  2952. 

  2953.     ui = floorf(uf);

  2954.     vi = floorf(vf);

  2955. 

  2956.     *du = uf - ui;

  2957.     *dv = vf - vi;

  2958. 

  2959.     for (int i = 0; i < 4; i++) {

  2960.         for (int j = 0; j < 4; j++) {

  2961.             us[i][j] = av_clip(u_shift + ui + j - 1, 0, width  - 1);

  2962.             vs[i][j] = av_clip(          vi + i - 1, 0, height - 1);

  2963.         }

  2964.     }

  2965. 

  2966.     return 1;

  2967. }

  2968. 

  2969. /**

  2970.  * Calculate 3D coordinates on sphere for corresponding frame position in barrel facebook's format.

  2971.  *

  2972.  * @param s filter private context

  2973.  * @param i horizontal position on frame [0, width)

  2974.  * @param j vertical position on frame [0, height)

  2975.  * @param width frame width

  2976.  * @param height frame height

  2977.  * @param vec coordinates on sphere

  2978.  */

  2979. static int barrel_to_xyz(const V360Context *s,

  2980.                          int i, int j, int width, int height,

  2981.                          float *vec)

  2982. {

  2983.     const float scale = 0.99f;

  2984.     float l_x, l_y, l_z;

  2985. 

  2986.     if (i < 4 * width / 5) {

  2987.         const float theta_range = M_PI_4;

  2988. 

  2989.         const int ew = 4 * width / 5;

  2990.         const int eh = height;

  2991. 

  2992.         const float phi   = ((2.f * i) / ew - 1.f) * M_PI        / scale;

  2993.         const float theta = ((2.f * j) / eh - 1.f) * theta_range / scale;

  2994. 

  2995.         const float sin_phi   = sinf(phi);

  2996.         const float cos_phi   = cosf(phi);

  2997.         const float sin_theta = sinf(theta);

  2998.         const float cos_theta = cosf(theta);

  2999. 

  3000.         l_x =  cos_theta * sin_phi;

  3001.         l_y = -sin_theta;

  3002.         l_z = -cos_theta * cos_phi;

  3003.     } else {

  3004.         const int ew = width  / 5;

  3005.         const int eh = height / 2;

  3006. 

  3007.         float uf, vf;

  3008. 

  3009.         if (j < eh) {   // UP

  3010.             uf = 2.f * (i - 4 * ew) / ew - 1.f;

  3011.             vf = 2.f * (j         ) / eh - 1.f;

  3012. 

  3013.             uf /= scale;

  3014.             vf /= scale;

  3015. 

  3016.             l_x =  uf;

  3017.             l_y =  1.f;

  3018.             l_z = -vf;

  3019.         } else {            // DOWN

  3020.             uf = 2.f * (i - 4 * ew) / ew - 1.f;

  3021.             vf = 2.f * (j -     eh) / eh - 1.f;

  3022. 

  3023.             uf /= scale;

  3024.             vf /= scale;

  3025. 

  3026.             l_x =  uf;

  3027.             l_y = -1.f;

  3028.             l_z =  vf;

  3029.         }

  3030.     }

  3031. 

  3032.     vec[0] = l_x;

  3033.     vec[1] = l_y;

  3034.     vec[2] = l_z;

  3035. 

  3036.     normalize_vector(vec);

  3037. 

  3038.     return 1;

  3039. }

  3040. 

  3041. /**

  3042.  * Calculate frame position in barrel facebook's format for corresponding 3D coordinates on sphere.

  3043.  *

  3044.  * @param s filter private context

  3045.  * @param vec coordinates on sphere

  3046.  * @param width frame width

  3047.  * @param height frame height

  3048.  * @param us horizontal coordinates for interpolation window

  3049.  * @param vs vertical coordinates for interpolation window

  3050.  * @param du horizontal relative coordinate

  3051.  * @param dv vertical relative coordinate

  3052.  */

  3053. static int xyz_to_barrel(const V360Context *s,

  3054.                          const float *vec, int width, int height,

  3055.                          int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)

  3056. {

  3057.     const float scale = 0.99f;

  3058. 

  3059.     const float phi   = atan2f(vec[0], -vec[2]) * s->input_mirror_modifier[0];

  3060.     const float theta = asinf(-vec[1]) * s->input_mirror_modifier[1];

  3061.     const float theta_range = M_PI_4;

  3062. 

  3063.     int ew, eh;

  3064.     int u_shift, v_shift;

  3065.     float uf, vf;

  3066.     int ui, vi;

  3067. 

  3068.     if (theta > -theta_range && theta < theta_range) {

  3069.         ew = 4 * width / 5;

  3070.         eh = height;

  3071. 

  3072.         u_shift = s->ih_flip ? width / 5 : 0;

  3073.         v_shift = 0;

  3074. 

  3075.         uf = (phi   / M_PI        * scale + 1.f) * ew / 2.f;

  3076.         vf = (theta / theta_range * scale + 1.f) * eh / 2.f;

  3077.     } else {

  3078.         ew = width  / 5;

  3079.         eh = height / 2;

  3080. 

  3081.         u_shift = s->ih_flip ? 0 : 4 * ew;

  3082. 

  3083.         if (theta < 0.f) {  // UP

  3084.             uf =  vec[0] / vec[1];

  3085.             vf = -vec[2] / vec[1];

  3086.             v_shift = 0;

  3087.         } else {            // DOWN

  3088.             uf = -vec[0] / vec[1];

  3089.             vf = -vec[2] / vec[1];

  3090.             v_shift = eh;

  3091.         }

  3092. 

  3093.         uf *= s->input_mirror_modifier[0] * s->input_mirror_modifier[1];

  3094.         vf *= s->input_mirror_modifier[1];

  3095. 

  3096.         uf = 0.5f * ew * (uf * scale + 1.f);

  3097.         vf = 0.5f * eh * (vf * scale + 1.f);

  3098.     }

  3099. 

  3100.     ui = floorf(uf);

  3101.     vi = floorf(vf);

  3102. 

  3103.     *du = uf - ui;

  3104.     *dv = vf - vi;

  3105. 

  3106.     for (int i = 0; i < 4; i++) {

  3107.         for (int j = 0; j < 4; j++) {

  3108.             us[i][j] = u_shift + av_clip(ui + j - 1, 0, ew - 1);

  3109.             vs[i][j] = v_shift + av_clip(vi + i - 1, 0, eh - 1);

  3110.         }

  3111.     }

  3112. 

  3113.     return 1;

  3114. }

  3115. 

  3116. /**

  3117.  * Calculate frame position in barrel split facebook's format for corresponding 3D coordinates on sphere.

  3118.  *

  3119.  * @param s filter private context

  3120.  * @param vec coordinates on sphere

  3121.  * @param width frame width

  3122.  * @param height frame height

  3123.  * @param us horizontal coordinates for interpolation window

  3124.  * @param vs vertical coordinates for interpolation window

  3125.  * @param du horizontal relative coordinate

  3126.  * @param dv vertical relative coordinate

  3127.  */

  3128. static int xyz_to_barrelsplit(const V360Context *s,

  3129.                               const float *vec, int width, int height,

  3130.                               int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)

  3131. {

  3132.     const float phi   = atan2f(vec[0], -vec[2]) * s->input_mirror_modifier[0];

  3133.     const float theta = asinf(-vec[1]) * s->input_mirror_modifier[1];

  3134. 

  3135.     const float theta_range = M_PI_4;

  3136. 

  3137.     int ew, eh;

  3138.     int u_shift, v_shift;

  3139.     float uf, vf;

  3140.     int ui, vi;

  3141. 

  3142.     if (theta >= -theta_range && theta <= theta_range) {

  3143.         const float scalew = s->fin_pad > 0 ? 1.f - s->fin_pad / (width * 2.f / 3.f) : 1.f - s->in_pad;

  3144.         const float scaleh = s->fin_pad > 0 ? 1.f - s->fin_pad / (height / 2.f) : 1.f - s->in_pad;

  3145. 

  3146.         ew = width / 3 * 2;

  3147.         eh = height / 2;

  3148. 

  3149.         u_shift = s->ih_flip ? width / 3 : 0;

  3150.         v_shift = phi >= M_PI_2 || phi < -M_PI_2 ? eh : 0;

  3151. 

  3152.         uf = fmodf(phi, M_PI_2) / M_PI_2;

  3153.         vf = theta / M_PI_4;

  3154. 

  3155.         if (v_shift)

  3156.             uf = uf >= 0.f ? fmodf(uf - 1.f, 1.f) : fmodf(uf + 1.f, 1.f);

  3157. 

  3158.         uf = (uf * scalew + 1.f) * width  / 3.f;

  3159.         vf = (vf * scaleh + 1.f) * height / 4.f;

  3160.     } else {

  3161.         const float scalew = s->fin_pad > 0 ? 1.f - s->fin_pad / (width  / 3.f) : 1.f - s->in_pad;

  3162.         const float scaleh = s->fin_pad > 0 ? 1.f - s->fin_pad / (height / 4.f) : 1.f - s->in_pad;

  3163.         int v_offset = 0;

  3164. 

  3165.         ew = width  / 3;

  3166.         eh = height / 4;

  3167. 

  3168.         u_shift = s->ih_flip ? 0 : 2 * ew;

  3169. 

  3170.         if (theta <= 0.f && theta >= -M_PI_2 &&

  3171.             phi <= M_PI_2 && phi >= -M_PI_2) {

  3172.             uf =  vec[0] / vec[1];

  3173.             vf = -vec[2] / vec[1];

  3174.             v_shift = 0;

  3175.             v_offset = -eh;

  3176.         } else if (theta >= 0.f && theta <= M_PI_2 &&

  3177.                    phi <= M_PI_2 && phi >= -M_PI_2) {

  3178.             uf = -vec[0] / vec[1];

  3179.             vf = -vec[2] / vec[1];

  3180.             v_shift = height * 0.25f;

  3181.         } else if (theta <= 0.f && theta >= -M_PI_2) {

  3182.             uf = -vec[0] / vec[1];

  3183.             vf =  vec[2] / vec[1];

  3184.             v_shift = height * 0.5f;

  3185.             v_offset = -eh;

  3186.         } else {

  3187.             uf = vec[0] / vec[1];

  3188.             vf = vec[2] / vec[1];

  3189.             v_shift = height * 0.75f;

  3190.         }

  3191. 

  3192.         uf *= s->input_mirror_modifier[0] * s->input_mirror_modifier[1];

  3193.         vf *= s->input_mirror_modifier[1];

  3194. 

  3195.         uf = 0.5f * width / 3.f * (uf * scalew + 1.f);

  3196.         vf = height * 0.25f * (vf * scaleh + 1.f) + v_offset;

  3197.     }

  3198. 

  3199.     ui = floorf(uf);

  3200.     vi = floorf(vf);

  3201. 

  3202.     *du = uf - ui;

  3203.     *dv = vf - vi;

  3204. 

  3205.     for (int i = 0; i < 4; i++) {

  3206.         for (int j = 0; j < 4; j++) {

  3207.             us[i][j] = u_shift + av_clip(ui + j - 1, 0, ew - 1);

  3208.             vs[i][j] = v_shift + av_clip(vi + i - 1, 0, eh - 1);

  3209.         }

  3210.     }

  3211. 

  3212.     return 1;

  3213. }

  3214. 

  3215. /**

  3216.  * Calculate 3D coordinates on sphere for corresponding frame position in barrel split facebook's format.

  3217.  *

  3218.  * @param s filter private context

  3219.  * @param i horizontal position on frame [0, width)

  3220.  * @param j vertical position on frame [0, height)

  3221.  * @param width frame width

  3222.  * @param height frame height

  3223.  * @param vec coordinates on sphere

  3224.  */

  3225. static int barrelsplit_to_xyz(const V360Context *s,

  3226.                               int i, int j, int width, int height,

  3227.                               float *vec)

  3228. {

  3229.     const float x = (i + 0.5f) / width;

  3230.     const float y = (j + 0.5f) / height;

  3231.     float l_x, l_y, l_z;

  3232. 

  3233.     if (x < 2.f / 3.f) {

  3234.         const float scalew = s->fout_pad > 0 ? 1.f - s->fout_pad / (width * 2.f / 3.f) : 1.f - s->out_pad;

  3235.         const float scaleh = s->fout_pad > 0 ? 1.f - s->fout_pad / (height / 2.f) : 1.f - s->out_pad;

  3236. 

  3237.         const float back = floorf(y * 2.f);

  3238. 

  3239.         const float phi   = ((3.f / 2.f * x - 0.5f) / scalew - back + 1.f) * M_PI;

  3240.         const float theta = (y - 0.25f - 0.5f * back) / scaleh * M_PI;

  3241. 

  3242.         const float sin_phi   = sinf(phi);

  3243.         const float cos_phi   = cosf(phi);

  3244.         const float sin_theta = sinf(theta);

  3245.         const float cos_theta = cosf(theta);

  3246. 

  3247.         l_x = -cos_theta * sin_phi;

  3248.         l_y = -sin_theta;

  3249.         l_z =  cos_theta * cos_phi;

  3250.     } else {

  3251.         const float scalew = s->fout_pad > 0 ? 1.f - s->fout_pad / (width  / 3.f) : 1.f - s->out_pad;

  3252.         const float scaleh = s->fout_pad > 0 ? 1.f - s->fout_pad / (height / 4.f) : 1.f - s->out_pad;

  3253. 

  3254.         const int face = floorf(y * 4.f);

  3255.         float uf, vf;

  3256. 

  3257.         uf = x * 3.f - 2.f;

  3258. 

  3259.         switch (face) {

  3260.         case 0:

  3261.             vf = y * 2.f;

  3262.             uf = 1.f - uf;

  3263.             vf = 0.5f - vf;

  3264. 

  3265.             l_x = (0.5f - uf) / scalew;

  3266.             l_y =  0.5f;

  3267.             l_z = (-0.5f + vf) / scaleh;

  3268.             break;

  3269.         case 1:

  3270.             vf = y * 2.f;

  3271.             uf = 1.f - uf;

  3272.             vf = 1.f - (vf - 0.5f);

  3273. 

  3274.             l_x = (0.5f - uf) / scalew;

  3275.             l_y = -0.5f;

  3276.             l_z = (0.5f - vf) / scaleh;

  3277.             break;

  3278.         case 2:

  3279.             vf = y * 2.f - 0.5f;

  3280.             vf = 1.f - (1.f - vf);

  3281. 

  3282.             l_x = (0.5f - uf) / scalew;

  3283.             l_y = 0.5f;

  3284.             l_z = (-0.5f + vf) / scaleh;

  3285.             break;

  3286.         case 3:

  3287.             vf = y * 2.f - 1.5f;

  3288. 

  3289.             l_x = (0.5f - uf) / scalew;

  3290.             l_y = -0.5f;

  3291.             l_z = (0.5f - vf) / scaleh;

  3292.             break;

  3293.         }

  3294.     }

  3295. 

  3296.     vec[0] = l_x;

  3297.     vec[1] = l_y;

  3298.     vec[2] = l_z;

  3299. 

  3300.     normalize_vector(vec);

  3301. 

  3302.     return 1;

  3303. }

  3304. 

  3305. /**

  3306.  * Calculate 3D coordinates on sphere for corresponding frame position in tspyramid format.

  3307.  *

  3308.  * @param s filter private context

  3309.  * @param i horizontal position on frame [0, width)

  3310.  * @param j vertical position on frame [0, height)

  3311.  * @param width frame width

  3312.  * @param height frame height

  3313.  * @param vec coordinates on sphere

  3314.  */

  3315. static int tspyramid_to_xyz(const V360Context *s,

  3316.                             int i, int j, int width, int height,

  3317.                             float *vec)

  3318. {

  3319.     const float x = (i + 0.5f) / width;

  3320.     const float y = (j + 0.5f) / height;

  3321. 

  3322.     if (x < 0.5f) {

  3323.         vec[0] =   x * 4.f - 1.f;

  3324.         vec[1] = -(y * 2.f - 1.f);

  3325.         vec[2] = -1.f;

  3326.     } else if (x >= 0.6875f && x < 0.8125f &&

  3327.                y >= 0.375f  && y < 0.625f) {

  3328.         vec[0] = -(x - 0.6875f) * 16.f + 1.f;

  3329.         vec[1] = -(y - 0.375f) * 8.f + 1.f;

  3330.         vec[2] = 1.f;

  3331.     } else if (0.5f <= x && x < 0.6875f &&

  3332.                ((0.f <= y && y < 0.375f && y >= 2.f * (x - 0.5f)) ||

  3333.                 (0.375f <= y && y < 0.625f) ||

  3334.                 (0.625f <= y && y < 1.f && y <= 2.f * (1.f - x)))) {

  3335.         vec[0] =  1.f;

  3336.         vec[1] = -2.f * (y - 2.f * x + 1.f) / (3.f - 4.f * x) + 1.f;

  3337.         vec[2] =  2.f * (x - 0.5f) / 0.1875f - 1.f;

  3338.     } else if (0.8125f <= x && x < 1.f &&

  3339.                ((0.f <= y && y < 0.375f && x >= (1.f - y / 2.f)) ||

  3340.                 (0.375f <= y && y < 0.625f) ||

  3341.                 (0.625f <= y && y < 1.f && y <= (2.f * x - 1.f)))) {

  3342.         vec[0] = -1.f;

  3343.         vec[1] = -2.f * (y + 2.f * x - 2.f) / (4.f * x - 3.f) + 1.f;

  3344.         vec[2] = -2.f * (x - 0.8125f) / 0.1875f + 1.f;

  3345.     } else if (0.f <= y && y < 0.375f &&

  3346.                ((0.5f <= x && x < 0.8125f && y < 2.f * (x - 0.5f)) ||

  3347.                 (0.6875f <= x && x < 0.8125f) ||

  3348.                 (0.8125f <= x && x < 1.f && x < (1.f - y / 2.f)))) {

  3349.         vec[0] =  2.f * (1.f - x - 0.5f * y) / (0.5f - y) - 1.f;

  3350.         vec[1] =  1.f;

  3351.         vec[2] = -2.f * (0.375f - y) / 0.375f + 1.f;

  3352.     } else {

  3353.         vec[0] =  2.f * (0.5f - x + 0.5f * y) / (y - 0.5f) - 1.f;

  3354.         vec[1] = -1.f;

  3355.         vec[2] =  2.f * (1.f - y) / 0.375f - 1.f;

  3356.     }

  3357. 

  3358.     normalize_vector(vec);

  3359. 

  3360.     return 1;

  3361. }

  3362. 

  3363. /**

  3364.  * Calculate frame position in tspyramid format for corresponding 3D coordinates on sphere.

  3365.  *

  3366.  * @param s filter private context

  3367.  * @param vec coordinates on sphere

  3368.  * @param width frame width

  3369.  * @param height frame height

  3370.  * @param us horizontal coordinates for interpolation window

  3371.  * @param vs vertical coordinates for interpolation window

  3372.  * @param du horizontal relative coordinate

  3373.  * @param dv vertical relative coordinate

  3374.  */

  3375. static int xyz_to_tspyramid(const V360Context *s,

  3376.                             const float *vec, int width, int height,

  3377.                             int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)

  3378. {

  3379.     float uf, vf;

  3380.     int ui, vi;

  3381.     int face;

  3382. 

  3383.     xyz_to_cube(s, vec, &uf, &vf, &face);

  3384. 

  3385.     uf = (uf + 1.f) * 0.5f;

  3386.     vf = (vf + 1.f) * 0.5f;

  3387. 

  3388.     switch (face) {

  3389.     case UP:

  3390.         uf = 0.1875f * vf - 0.375f * uf * vf - 0.125f * uf + 0.8125f;

  3391.         vf = 0.375f - 0.375f * vf;

  3392.         break;

  3393.     case FRONT:

  3394.         uf = 0.5f * uf;

  3395.         break;

  3396.     case DOWN:

  3397.         uf = 1.f - 0.1875f * vf - 0.5f * uf + 0.375f * uf * vf;

  3398.         vf = 1.f - 0.375f * vf;

  3399.         break;

  3400.     case LEFT:

  3401.         vf = 0.25f * vf + 0.75f * uf * vf - 0.375f * uf + 0.375f;

  3402.         uf = 0.1875f * uf + 0.8125f;

  3403.         break;

  3404.     case RIGHT:

  3405.         vf = 0.375f * uf - 0.75f * uf * vf + vf;

  3406.         uf = 0.1875f * uf + 0.5f;

  3407.         break;

  3408.     case BACK:

  3409.         uf = 0.125f * uf + 0.6875f;

  3410.         vf = 0.25f * vf + 0.375f;

  3411.         break;

  3412.     }

  3413. 

  3414.     uf *= width;

  3415.     vf *= height;

  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] = reflectx(ui + j - 1, vi + i - 1, width, height);

  3426.             vs[i][j] = reflecty(vi + i - 1, height);

  3427.         }

  3428.     }

  3429. 

  3430.     return 1;

  3431. }

  3432. 

  3433. static void multiply_matrix(float c[3][3], const float a[3][3], const float b[3][3])

  3434. {

  3435.     for (int i = 0; i < 3; i++) {

  3436.         for (int j = 0; j < 3; j++) {

  3437.             float sum = 0.f;

  3438. 

  3439.             for (int k = 0; k < 3; k++)

  3440.                 sum += a[i][k] * b[k][j];

  3441. 

  3442.             c[i][j] = sum;

  3443.         }

  3444.     }

  3445. }

  3446. 

  3447. /**

  3448.  * Calculate rotation matrix for yaw/pitch/roll angles.

  3449.  */

  3450. static inline void calculate_rotation_matrix(float yaw, float pitch, float roll,

  3451.                                              float rot_mat[3][3],

  3452.                                              const int rotation_order[3])

  3453. {

  3454.     const float yaw_rad   = yaw   * M_PI / 180.f;

  3455.     const float pitch_rad = pitch * M_PI / 180.f;

  3456.     const float roll_rad  = roll  * M_PI / 180.f;

  3457. 

  3458.     const float sin_yaw   = sinf(-yaw_rad);

  3459.     const float cos_yaw   = cosf(-yaw_rad);

  3460.     const float sin_pitch = sinf(pitch_rad);

  3461.     const float cos_pitch = cosf(pitch_rad);

  3462.     const float sin_roll  = sinf(roll_rad);

  3463.     const float cos_roll  = cosf(roll_rad);

  3464. 

  3465.     float m[3][3][3];

  3466.     float temp[3][3];

  3467. 

  3468.     m[0][0][0] =  cos_yaw;  m[0][0][1] = 0;          m[0][0][2] =  sin_yaw;

  3469.     m[0][1][0] =  0;        m[0][1][1] = 1;          m[0][1][2] =  0;

  3470.     m[0][2][0] = -sin_yaw;  m[0][2][1] = 0;          m[0][2][2] =  cos_yaw;

  3471. 

  3472.     m[1][0][0] = 1;         m[1][0][1] = 0;          m[1][0][2] =  0;

  3473.     m[1][1][0] = 0;         m[1][1][1] = cos_pitch;  m[1][1][2] = -sin_pitch;

  3474.     m[1][2][0] = 0;         m[1][2][1] = sin_pitch;  m[1][2][2] =  cos_pitch;

  3475. 

  3476.     m[2][0][0] = cos_roll;  m[2][0][1] = -sin_roll;  m[2][0][2] =  0;

  3477.     m[2][1][0] = sin_roll;  m[2][1][1] =  cos_roll;  m[2][1][2] =  0;

  3478.     m[2][2][0] = 0;         m[2][2][1] =  0;         m[2][2][2] =  1;

  3479. 

  3480.     multiply_matrix(temp, m[rotation_order[0]], m[rotation_order[1]]);

  3481.     multiply_matrix(rot_mat, temp, m[rotation_order[2]]);

  3482. }

  3483. 

  3484. /**

  3485.  * Rotate vector with given rotation matrix.

  3486.  *

  3487.  * @param rot_mat rotation matrix

  3488.  * @param vec vector

  3489.  */

  3490. static inline void rotate(const float rot_mat[3][3],

  3491.                           float *vec)

  3492. {

  3493.     const float x_tmp = vec[0] * rot_mat[0][0] + vec[1] * rot_mat[0][1] + vec[2] * rot_mat[0][2];

  3494.     const float y_tmp = vec[0] * rot_mat[1][0] + vec[1] * rot_mat[1][1] + vec[2] * rot_mat[1][2];

  3495.     const float z_tmp = vec[0] * rot_mat[2][0] + vec[1] * rot_mat[2][1] + vec[2] * rot_mat[2][2];

  3496. 

  3497.     vec[0] = x_tmp;

  3498.     vec[1] = y_tmp;

  3499.     vec[2] = z_tmp;

  3500. }

  3501. 

  3502. static inline void set_mirror_modifier(int h_flip, int v_flip, int d_flip,

  3503.                                        float *modifier)

  3504. {

  3505.     modifier[0] = h_flip ? -1.f : 1.f;

  3506.     modifier[1] = v_flip ? -1.f : 1.f;

  3507.     modifier[2] = d_flip ? -1.f : 1.f;

  3508. }

  3509. 

  3510. static inline void mirror(const float *modifier, float *vec)

  3511. {

  3512.     vec[0] *= modifier[0];

  3513.     vec[1] *= modifier[1];

  3514.     vec[2] *= modifier[2];

  3515. }

  3516. 

  3517. static int allocate_plane(V360Context *s, int sizeof_uv, int sizeof_ker, int sizeof_mask, int p)

  3518. {

  3519.     if (!s->u[p])

  3520.         s->u[p] = av_calloc(s->uv_linesize[p] * s->pr_height[p], sizeof_uv);

  3521.     if (!s->v[p])

  3522.         s->v[p] = av_calloc(s->uv_linesize[p] * s->pr_height[p], sizeof_uv);

  3523.     if (!s->u[p] || !s->v[p])

  3524.         return AVERROR(ENOMEM);

  3525.     if (sizeof_ker) {

  3526.         if (!s->ker[p])

  3527.             s->ker[p] = av_calloc(s->uv_linesize[p] * s->pr_height[p], sizeof_ker);

  3528.         if (!s->ker[p])

  3529.             return AVERROR(ENOMEM);

  3530.     }

  3531. 

  3532.     if (sizeof_mask && !p) {

  3533.         if (!s->mask)

  3534.             s->mask = av_calloc(s->pr_width[p] * s->pr_height[p], sizeof_mask);

  3535.         if (!s->mask)

  3536.             return AVERROR(ENOMEM);

  3537.     }

  3538. 

  3539.     return 0;

  3540. }

  3541. 

  3542. static void fov_from_dfov(int format, float d_fov, float w, float h, float *h_fov, float *v_fov)

  3543. {

  3544.     switch (format) {

  3545.     case FISHEYE:

  3546.         {

  3547.             const float d = 0.5f * hypotf(w, h);

  3548. 

  3549.             *h_fov = d / h * d_fov;

  3550.             *v_fov = d / w * d_fov;

  3551.         }

  3552.         break;

  3553.     case FLAT:

  3554.     default:

  3555.         {

  3556.             const float da = tanf(0.5f * FFMIN(d_fov, 359.f) * M_PI / 180.f);

  3557.             const float d = hypotf(w, h);

  3558. 

  3559.             *h_fov = atan2f(da * w, d) * 360.f / M_PI;

  3560.             *v_fov = atan2f(da * h, d) * 360.f / M_PI;

  3561. 

  3562.             if (*h_fov < 0.f)

  3563.                 *h_fov += 360.f;

  3564.             if (*v_fov < 0.f)

  3565.                 *v_fov += 360.f;

  3566.         }

  3567.         break;

  3568.     }

  3569. }

  3570. 

  3571. static void set_dimensions(int *outw, int *outh, int w, int h, const AVPixFmtDescriptor *desc)

  3572. {

  3573.     outw[1] = outw[2] = FF_CEIL_RSHIFT(w, desc->log2_chroma_w);

  3574.     outw[0] = outw[3] = w;

  3575.     outh[1] = outh[2] = FF_CEIL_RSHIFT(h, desc->log2_chroma_h);

  3576.     outh[0] = outh[3] = h;

  3577. }

  3578. 

  3579. // Calculate remap data

  3580. static av_always_inline int v360_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)

  3581. {

  3582.     V360Context *s = ctx->priv;

  3583. 

  3584.     for (int p = 0; p < s->nb_allocated; p++) {

  3585.         const int max_value = s->max_value;

  3586.         const int width = s->pr_width[p];

  3587.         const int uv_linesize = s->uv_linesize[p];

  3588.         const int height = s->pr_height[p];

  3589.         const int in_width = s->inplanewidth[p];

  3590.         const int in_height = s->inplaneheight[p];

  3591.         const int slice_start = (height *  jobnr     ) / nb_jobs;

  3592.         const int slice_end   = (height * (jobnr + 1)) / nb_jobs;

  3593.         float du, dv;

  3594.         float vec[3];

  3595.         XYRemap rmap;

  3596. 

  3597.         for (int j = slice_start; j < slice_end; j++) {

  3598.             for (int i = 0; i < width; i++) {

  3599.                 int16_t *u = s->u[p] + (j * uv_linesize + i) * s->elements;

  3600.                 int16_t *v = s->v[p] + (j * uv_linesize + i) * s->elements;

  3601.                 int16_t *ker = s->ker[p] + (j * uv_linesize + i) * s->elements;

  3602.                 uint8_t *mask8 = p ? NULL : s->mask + (j * s->pr_width[0] + i);

  3603.                 uint16_t *mask16 = p ? NULL : (uint16_t *)s->mask + (j * s->pr_width[0] + i);

  3604.                 int in_mask, out_mask;

  3605. 

  3606.                 if (s->out_transpose)

  3607.                     out_mask = s->out_transform(s, j, i, height, width, vec);

  3608.                 else

  3609.                     out_mask = s->out_transform(s, i, j, width, height, vec);

  3610.                 av_assert1(!isnan(vec[0]) && !isnan(vec[1]) && !isnan(vec[2]));

  3611.                 rotate(s->rot_mat, vec);

  3612.                 av_assert1(!isnan(vec[0]) && !isnan(vec[1]) && !isnan(vec[2]));

  3613.                 normalize_vector(vec);

  3614.                 mirror(s->output_mirror_modifier, vec);

  3615.                 if (s->in_transpose)

  3616.                     in_mask = s->in_transform(s, vec, in_height, in_width, rmap.v, rmap.u, &du, &dv);

  3617.                 else

  3618.                     in_mask = s->in_transform(s, vec, in_width, in_height, rmap.u, rmap.v, &du, &dv);

  3619.                 av_assert1(!isnan(du) && !isnan(dv));

  3620.                 s->calculate_kernel(du, dv, &rmap, u, v, ker);

  3621. 

  3622.                 if (!p && s->mask) {

  3623.                     if (s->mask_size == 1) {

  3624.                         mask8[0] = 255 * (out_mask & in_mask);

  3625.                     } else {

  3626.                         mask16[0] = max_value * (out_mask & in_mask);

  3627.                     }

  3628.                 }

  3629.             }

  3630.         }

  3631.     }

  3632. 

  3633.     return 0;

  3634. }

  3635. 

  3636. static int config_output(AVFilterLink *outlink)

  3637. {

  3638.     AVFilterContext *ctx = outlink->src;

  3639.     AVFilterLink *inlink = ctx->inputs[0];

  3640.     V360Context *s = ctx->priv;

  3641.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);

  3642.     const int depth = desc->comp[0].depth;

  3643.     const int sizeof_mask = s->mask_size = (depth + 7) >> 3;

  3644.     int sizeof_uv;

  3645.     int sizeof_ker;

  3646.     int err;

  3647.     int h, w;

  3648.     int in_offset_h, in_offset_w;

  3649.     int out_offset_h, out_offset_w;

  3650.     float hf, wf;

  3651.     int (*prepare_out)(AVFilterContext *ctx);

  3652.     int have_alpha;

  3653. 

  3654.     s->max_value = (1 << depth) - 1;

  3655.     s->input_mirror_modifier[0] = s->ih_flip ? -1.f : 1.f;

  3656.     s->input_mirror_modifier[1] = s->iv_flip ? -1.f : 1.f;

  3657. 

  3658.     switch (s->interp) {

  3659.     case NEAREST:

  3660.         s->calculate_kernel = nearest_kernel;

  3661.         s->remap_slice = depth <= 8 ? remap1_8bit_slice : remap1_16bit_slice;

  3662.         s->elements = 1;

  3663.         sizeof_uv = sizeof(int16_t) * s->elements;

  3664.         sizeof_ker = 0;

  3665.         break;

  3666.     case BILINEAR:

  3667.         s->calculate_kernel = bilinear_kernel;

  3668.         s->remap_slice = depth <= 8 ? remap2_8bit_slice : remap2_16bit_slice;

  3669.         s->elements = 2 * 2;

  3670.         sizeof_uv = sizeof(int16_t) * s->elements;

  3671.         sizeof_ker = sizeof(int16_t) * s->elements;

  3672.         break;

  3673.     case BICUBIC:

  3674.         s->calculate_kernel = bicubic_kernel;

  3675.         s->remap_slice = depth <= 8 ? remap4_8bit_slice : remap4_16bit_slice;

  3676.         s->elements = 4 * 4;

  3677.         sizeof_uv = sizeof(int16_t) * s->elements;

  3678.         sizeof_ker = sizeof(int16_t) * s->elements;

  3679.         break;

  3680.     case LANCZOS:

  3681.         s->calculate_kernel = lanczos_kernel;

  3682.         s->remap_slice = depth <= 8 ? remap4_8bit_slice : remap4_16bit_slice;

  3683.         s->elements = 4 * 4;

  3684.         sizeof_uv = sizeof(int16_t) * s->elements;

  3685.         sizeof_ker = sizeof(int16_t) * s->elements;

  3686.         break;

  3687.     case SPLINE16:

  3688.         s->calculate_kernel = spline16_kernel;

  3689.         s->remap_slice = depth <= 8 ? remap4_8bit_slice : remap4_16bit_slice;

  3690.         s->elements = 4 * 4;

  3691.         sizeof_uv = sizeof(int16_t) * s->elements;

  3692.         sizeof_ker = sizeof(int16_t) * s->elements;

  3693.         break;

  3694.     case GAUSSIAN:

  3695.         s->calculate_kernel = gaussian_kernel;

  3696.         s->remap_slice = depth <= 8 ? remap4_8bit_slice : remap4_16bit_slice;

  3697.         s->elements = 4 * 4;

  3698.         sizeof_uv = sizeof(int16_t) * s->elements;

  3699.         sizeof_ker = sizeof(int16_t) * s->elements;

  3700.         break;

  3701.     default:

  3702.         av_assert0(0);

  3703.     }

  3704. 

  3705.     ff_v360_init(s, depth);

  3706. 

  3707.     for (int order = 0; order < NB_RORDERS; order++) {

  3708.         const char c = s->rorder[order];

  3709.         int rorder;

  3710. 

  3711.         if (c == '\0') {

  3712.             av_log(ctx, AV_LOG_WARNING,

  3713.                    "Incomplete rorder option. Direction for all 3 rotation orders should be specified. Switching to default rorder.\n");

  3714.             s->rotation_order[0] = YAW;

  3715.             s->rotation_order[1] = PITCH;

  3716.             s->rotation_order[2] = ROLL;

  3717.             break;

  3718.         }

  3719. 

  3720.         rorder = get_rorder(c);

  3721.         if (rorder == -1) {

  3722.             av_log(ctx, AV_LOG_WARNING,

  3723.                    "Incorrect rotation order symbol '%c' in rorder option. Switching to default rorder.\n", c);

  3724.             s->rotation_order[0] = YAW;

  3725.             s->rotation_order[1] = PITCH;

  3726.             s->rotation_order[2] = ROLL;

  3727.             break;

  3728.         }

  3729. 

  3730.         s->rotation_order[order] = rorder;

  3731.     }

  3732. 

  3733.     switch (s->in_stereo) {

  3734.     case STEREO_2D:

  3735.         w = inlink->w;

  3736.         h = inlink->h;

  3737.         in_offset_w = in_offset_h = 0;

  3738.         break;

  3739.     case STEREO_SBS:

  3740.         w = inlink->w / 2;

  3741.         h = inlink->h;

  3742.         in_offset_w = w;

  3743.         in_offset_h = 0;

  3744.         break;

  3745.     case STEREO_TB:

  3746.         w = inlink->w;

  3747.         h = inlink->h / 2;

  3748.         in_offset_w = 0;

  3749.         in_offset_h = h;

  3750.         break;

  3751.     default:

  3752.         av_assert0(0);

  3753.     }

  3754. 

  3755.     set_dimensions(s->inplanewidth, s->inplaneheight, w, h, desc);

  3756.     set_dimensions(s->in_offset_w, s->in_offset_h, in_offset_w, in_offset_h, desc);

  3757. 

  3758.     s->in_width = s->inplanewidth[0];

  3759.     s->in_height = s->inplaneheight[0];

  3760. 

  3761.     if (s->id_fov > 0.f)

  3762.         fov_from_dfov(s->in, s->id_fov, w, h, &s->ih_fov, &s->iv_fov);

  3763. 

  3764.     if (s->in_transpose)

  3765.         FFSWAP(int, s->in_width, s->in_height);

  3766. 

  3767.     switch (s->in) {

  3768.     case EQUIRECTANGULAR:

  3769.         s->in_transform = xyz_to_equirect;

  3770.         err = 0;

  3771.         wf = w;

  3772.         hf = h;

  3773.         break;

  3774.     case CUBEMAP_3_2:

  3775.         s->in_transform = xyz_to_cube3x2;

  3776.         err = prepare_cube_in(ctx);

  3777.         wf = w / 3.f * 4.f;

  3778.         hf = h;

  3779.         break;

  3780.     case CUBEMAP_1_6:

  3781.         s->in_transform = xyz_to_cube1x6;

  3782.         err = prepare_cube_in(ctx);

  3783.         wf = w * 4.f;

  3784.         hf = h / 3.f;

  3785.         break;

  3786.     case CUBEMAP_6_1:

  3787.         s->in_transform = xyz_to_cube6x1;

  3788.         err = prepare_cube_in(ctx);

  3789.         wf = w / 3.f * 2.f;

  3790.         hf = h * 2.f;

  3791.         break;

  3792.     case EQUIANGULAR:

  3793.         s->in_transform = xyz_to_eac;

  3794.         err = prepare_eac_in(ctx);

  3795.         wf = w;

  3796.         hf = h / 9.f * 8.f;

  3797.         break;

  3798.     case FLAT:

  3799.         s->in_transform = xyz_to_flat;

  3800.         err = prepare_flat_in(ctx);

  3801.         wf = w;

  3802.         hf = h;

  3803.         break;

  3804.     case PERSPECTIVE:

  3805.     case PANNINI:

  3806.         av_log(ctx, AV_LOG_ERROR, "Supplied format is not accepted as input.\n");

  3807.         return AVERROR(EINVAL);

  3808.     case DUAL_FISHEYE:

  3809.         s->in_transform = xyz_to_dfisheye;

  3810.         err = 0;

  3811.         wf = w;

  3812.         hf = h;

  3813.         break;

  3814.     case BARREL:

  3815.         s->in_transform = xyz_to_barrel;

  3816.         err = 0;

  3817.         wf = w / 5.f * 4.f;

  3818.         hf = h;

  3819.         break;

  3820.     case STEREOGRAPHIC:

  3821.         s->in_transform = xyz_to_stereographic;

  3822.         err = prepare_stereographic_in(ctx);

  3823.         wf = w;

  3824.         hf = h / 2.f;

  3825.         break;

  3826.     case MERCATOR:

  3827.         s->in_transform = xyz_to_mercator;

  3828.         err = 0;

  3829.         wf = w;

  3830.         hf = h / 2.f;

  3831.         break;

  3832.     case BALL:

  3833.         s->in_transform = xyz_to_ball;

  3834.         err = 0;

  3835.         wf = w;

  3836.         hf = h / 2.f;

  3837.         break;

  3838.     case HAMMER:

  3839.         s->in_transform = xyz_to_hammer;

  3840.         err = 0;

  3841.         wf = w;

  3842.         hf = h;

  3843.         break;

  3844.     case SINUSOIDAL:

  3845.         s->in_transform = xyz_to_sinusoidal;

  3846.         err = 0;

  3847.         wf = w;

  3848.         hf = h;

  3849.         break;

  3850.     case FISHEYE:

  3851.         s->in_transform = xyz_to_fisheye;

  3852.         err = prepare_fisheye_in(ctx);

  3853.         wf = w * 2;

  3854.         hf = h;

  3855.         break;

  3856.     case CYLINDRICAL:

  3857.         s->in_transform = xyz_to_cylindrical;

  3858.         err = prepare_cylindrical_in(ctx);

  3859.         wf = w;

  3860.         hf = h * 2.f;

  3861.         break;

  3862.     case TETRAHEDRON:

  3863.         s->in_transform = xyz_to_tetrahedron;

  3864.         err = 0;

  3865.         wf = w;

  3866.         hf = h;

  3867.         break;

  3868.     case BARREL_SPLIT:

  3869.         s->in_transform = xyz_to_barrelsplit;

  3870.         err = 0;

  3871.         wf = w * 4.f / 3.f;

  3872.         hf = h;

  3873.         break;

  3874.     case TSPYRAMID:

  3875.         s->in_transform = xyz_to_tspyramid;

  3876.         err = 0;

  3877.         wf = w;

  3878.         hf = h;

  3879.         break;

  3880.     case HEQUIRECTANGULAR:

  3881.         s->in_transform = xyz_to_hequirect;

  3882.         err = 0;

  3883.         wf = w * 2.f;

  3884.         hf = h;

  3885.         break;

  3886.     default:

  3887.         av_log(ctx, AV_LOG_ERROR, "Specified input format is not handled.\n");

  3888.         return AVERROR_BUG;

  3889.     }

  3890. 

  3891.     if (err != 0) {

  3892.         return err;

  3893.     }

  3894. 

  3895.     switch (s->out) {

  3896.     case EQUIRECTANGULAR:

  3897.         s->out_transform = equirect_to_xyz;

  3898.         prepare_out = NULL;

  3899.         w = lrintf(wf);

  3900.         h = lrintf(hf);

  3901.         break;

  3902.     case CUBEMAP_3_2:

  3903.         s->out_transform = cube3x2_to_xyz;

  3904.         prepare_out = prepare_cube_out;

  3905.         w = lrintf(wf / 4.f * 3.f);

  3906.         h = lrintf(hf);

  3907.         break;

  3908.     case CUBEMAP_1_6:

  3909.         s->out_transform = cube1x6_to_xyz;

  3910.         prepare_out = prepare_cube_out;

  3911.         w = lrintf(wf / 4.f);

  3912.         h = lrintf(hf * 3.f);

  3913.         break;

  3914.     case CUBEMAP_6_1:

  3915.         s->out_transform = cube6x1_to_xyz;

  3916.         prepare_out = prepare_cube_out;

  3917.         w = lrintf(wf / 2.f * 3.f);

  3918.         h = lrintf(hf / 2.f);

  3919.         break;

  3920.     case EQUIANGULAR:

  3921.         s->out_transform = eac_to_xyz;

  3922.         prepare_out = prepare_eac_out;

  3923.         w = lrintf(wf);

  3924.         h = lrintf(hf / 8.f * 9.f);

  3925.         break;

  3926.     case FLAT:

  3927.         s->out_transform = flat_to_xyz;

  3928.         prepare_out = prepare_flat_out;

  3929.         w = lrintf(wf);

  3930.         h = lrintf(hf);

  3931.         break;

  3932.     case DUAL_FISHEYE:

  3933.         s->out_transform = dfisheye_to_xyz;

  3934.         prepare_out = NULL;

  3935.         w = lrintf(wf);

  3936.         h = lrintf(hf);

  3937.         break;

  3938.     case BARREL:

  3939.         s->out_transform = barrel_to_xyz;

  3940.         prepare_out = NULL;

  3941.         w = lrintf(wf / 4.f * 5.f);

  3942.         h = lrintf(hf);

  3943.         break;

  3944.     case STEREOGRAPHIC:

  3945.         s->out_transform = stereographic_to_xyz;

  3946.         prepare_out = prepare_stereographic_out;

  3947.         w = lrintf(wf);

  3948.         h = lrintf(hf * 2.f);

  3949.         break;

  3950.     case MERCATOR:

  3951.         s->out_transform = mercator_to_xyz;

  3952.         prepare_out = NULL;

  3953.         w = lrintf(wf);

  3954.         h = lrintf(hf * 2.f);

  3955.         break;

  3956.     case BALL:

  3957.         s->out_transform = ball_to_xyz;

  3958.         prepare_out = NULL;

  3959.         w = lrintf(wf);

  3960.         h = lrintf(hf * 2.f);

  3961.         break;

  3962.     case HAMMER:

  3963.         s->out_transform = hammer_to_xyz;

  3964.         prepare_out = NULL;

  3965.         w = lrintf(wf);

  3966.         h = lrintf(hf);

  3967.         break;

  3968.     case SINUSOIDAL:

  3969.         s->out_transform = sinusoidal_to_xyz;

  3970.         prepare_out = NULL;

  3971.         w = lrintf(wf);

  3972.         h = lrintf(hf);

  3973.         break;

  3974.     case FISHEYE:

  3975.         s->out_transform = fisheye_to_xyz;

  3976.         prepare_out = prepare_fisheye_out;

  3977.         w = lrintf(wf * 0.5f);

  3978.         h = lrintf(hf);

  3979.         break;

  3980.     case PANNINI:

  3981.         s->out_transform = pannini_to_xyz;

  3982.         prepare_out = NULL;

  3983.         w = lrintf(wf);

  3984.         h = lrintf(hf);

  3985.         break;

  3986.     case CYLINDRICAL:

  3987.         s->out_transform = cylindrical_to_xyz;

  3988.         prepare_out = prepare_cylindrical_out;

  3989.         w = lrintf(wf);

  3990.         h = lrintf(hf * 0.5f);

  3991.         break;

  3992.     case PERSPECTIVE:

  3993.         s->out_transform = perspective_to_xyz;

  3994.         prepare_out = NULL;

  3995.         w = lrintf(wf / 2.f);

  3996.         h = lrintf(hf);

  3997.         break;

  3998.     case TETRAHEDRON:

  3999.         s->out_transform = tetrahedron_to_xyz;

  4000.         prepare_out = NULL;

  4001.         w = lrintf(wf);

  4002.         h = lrintf(hf);

  4003.         break;

  4004.     case BARREL_SPLIT:

  4005.         s->out_transform = barrelsplit_to_xyz;

  4006.         prepare_out = NULL;

  4007.         w = lrintf(wf / 4.f * 3.f);

  4008.         h = lrintf(hf);

  4009.         break;

  4010.     case TSPYRAMID:

  4011.         s->out_transform = tspyramid_to_xyz;

  4012.         prepare_out = NULL;

  4013.         w = lrintf(wf);

  4014.         h = lrintf(hf);

  4015.         break;

  4016.     case HEQUIRECTANGULAR:

  4017.         s->out_transform = hequirect_to_xyz;

  4018.         prepare_out = NULL;

  4019.         w = lrintf(wf / 2.f);

  4020.         h = lrintf(hf);

  4021.         break;

  4022.     default:

  4023.         av_log(ctx, AV_LOG_ERROR, "Specified output format is not handled.\n");

  4024.         return AVERROR_BUG;

  4025.     }

  4026. 

  4027.     // Override resolution with user values if specified

  4028.     if (s->width > 0 && s->height <= 0 && s->h_fov > 0.f && s->v_fov > 0.f &&

  4029.         s->out == FLAT && s->d_fov == 0.f) {

  4030.         w = s->width;

  4031.         h = w / tanf(s->h_fov * M_PI / 360.f) * tanf(s->v_fov * M_PI / 360.f);

  4032.     } else if (s->width <= 0 && s->height > 0 && s->h_fov > 0.f && s->v_fov > 0.f &&

  4033.         s->out == FLAT && s->d_fov == 0.f) {

  4034.         h = s->height;

  4035.         w = h / tanf(s->v_fov * M_PI / 360.f) * tanf(s->h_fov * M_PI / 360.f);

  4036.     } else if (s->width > 0 && s->height > 0) {

  4037.         w = s->width;

  4038.         h = s->height;

  4039.     } else if (s->width > 0 || s->height > 0) {

  4040.         av_log(ctx, AV_LOG_ERROR, "Both width and height values should be specified.\n");

  4041.         return AVERROR(EINVAL);

  4042.     } else {

  4043.         if (s->out_transpose)

  4044.             FFSWAP(int, w, h);

  4045. 

  4046.         if (s->in_transpose)

  4047.             FFSWAP(int, w, h);

  4048.     }

  4049. 

  4050.     s->width  = w;

  4051.     s->height = h;

  4052. 

  4053.     if (s->d_fov > 0.f)

  4054.         fov_from_dfov(s->out, s->d_fov, w, h, &s->h_fov, &s->v_fov);

  4055. 

  4056.     if (prepare_out) {

  4057.         err = prepare_out(ctx);

  4058.         if (err != 0)

  4059.             return err;

  4060.     }

  4061. 

  4062.     set_dimensions(s->pr_width, s->pr_height, w, h, desc);

  4063. 

  4064.     switch (s->out_stereo) {

  4065.     case STEREO_2D:

  4066.         out_offset_w = out_offset_h = 0;

  4067.         break;

  4068.     case STEREO_SBS:

  4069.         out_offset_w = w;

  4070.         out_offset_h = 0;

  4071.         w *= 2;

  4072.         break;

  4073.     case STEREO_TB:

  4074.         out_offset_w = 0;

  4075.         out_offset_h = h;

  4076.         h *= 2;

  4077.         break;

  4078.     default:

  4079.         av_assert0(0);

  4080.     }

  4081. 

  4082.     set_dimensions(s->out_offset_w, s->out_offset_h, out_offset_w, out_offset_h, desc);

  4083.     set_dimensions(s->planewidth, s->planeheight, w, h, desc);

  4084. 

  4085.     for (int i = 0; i < 4; i++)

  4086.         s->uv_linesize[i] = FFALIGN(s->pr_width[i], 8);

  4087. 

  4088.     outlink->h = h;

  4089.     outlink->w = w;

  4090. 

  4091.     s->nb_planes = av_pix_fmt_count_planes(inlink->format);

  4092.     have_alpha   = !!(desc->flags & AV_PIX_FMT_FLAG_ALPHA);

  4093. 

  4094.     if (desc->log2_chroma_h == desc->log2_chroma_w && desc->log2_chroma_h == 0) {

  4095.         s->nb_allocated = 1;

  4096.         s->map[0] = s->map[1] = s->map[2] = s->map[3] = 0;

  4097.     } else {

  4098.         s->nb_allocated = 2;

  4099.         s->map[0] = s->map[3] = 0;

  4100.         s->map[1] = s->map[2] = 1;

  4101.     }

  4102. 

  4103.     for (int i = 0; i < s->nb_allocated; i++)

  4104.         allocate_plane(s, sizeof_uv, sizeof_ker, sizeof_mask * have_alpha * s->alpha, i);

  4105. 

  4106.     calculate_rotation_matrix(s->yaw, s->pitch, s->roll, s->rot_mat, s->rotation_order);

  4107.     set_mirror_modifier(s->h_flip, s->v_flip, s->d_flip, s->output_mirror_modifier);

  4108. 

  4109.     ctx->internal->execute(ctx, v360_slice, NULL, NULL, FFMIN(outlink->h, ff_filter_get_nb_threads(ctx)));

  4110. 

  4111.     return 0;

  4112. }

  4113. 

  4114. static int filter_frame(AVFilterLink *inlink, AVFrame *in)

  4115. {

  4116.     AVFilterContext *ctx = inlink->dst;

  4117.     AVFilterLink *outlink = ctx->outputs[0];

  4118.     V360Context *s = ctx->priv;

  4119.     AVFrame *out;

  4120.     ThreadData td;

  4121. 

  4122.     out = ff_get_video_buffer(outlink, outlink->w, outlink->h);

  4123.     if (!out) {

  4124.         av_frame_free(&in);

  4125.         return AVERROR(ENOMEM);

  4126.     }

  4127.     av_frame_copy_props(out, in);

  4128. 

  4129.     td.in = in;

  4130.     td.out = out;

  4131. 

  4132.     ctx->internal->execute(ctx, s->remap_slice, &td, NULL, FFMIN(outlink->h, ff_filter_get_nb_threads(ctx)));

  4133. 

  4134.     av_frame_free(&in);

  4135.     return ff_filter_frame(outlink, out);

  4136. }

  4137. 

  4138. static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,

  4139.                            char *res, int res_len, int flags)

  4140. {

  4141.     int ret;

  4142. 

  4143.     ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags);

  4144.     if (ret < 0)

  4145.         return ret;

  4146. 

  4147.     return config_output(ctx->outputs[0]);

  4148. }

  4149. 

  4150. static av_cold void uninit(AVFilterContext *ctx)

  4151. {

  4152.     V360Context *s = ctx->priv;

  4153. 

  4154.     for (int p = 0; p < s->nb_allocated; p++) {

  4155.         av_freep(&s->u[p]);

  4156.         av_freep(&s->v[p]);

  4157.         av_freep(&s->ker[p]);

  4158.     }

  4159.     av_freep(&s->mask);

  4160. }

  4161. 

  4162. static const AVFilterPad inputs[] = {

  4163.     {

  4164.         .name         = "default",

  4165.         .type         = AVMEDIA_TYPE_VIDEO,

  4166.         .filter_frame = filter_frame,

  4167.     },

  4168.     { NULL }

  4169. };

  4170. 

  4171. static const AVFilterPad outputs[] = {

  4172.     {

  4173.         .name         = "default",

  4174.         .type         = AVMEDIA_TYPE_VIDEO,

  4175.         .config_props = config_output,

  4176.     },

  4177.     { NULL }

  4178. };

  4179. 

  4180. AVFilter ff_vf_v360 = {

  4181.     .name          = "v360",

  4182.     .description   = NULL_IF_CONFIG_SMALL("Convert 360 projection of video."),

  4183.     .priv_size     = sizeof(V360Context),

  4184.     .uninit        = uninit,

  4185.     .query_formats = query_formats,

  4186.     .inputs        = inputs,

  4187.     .outputs       = outputs,

  4188.     .priv_class    = &v360_class,

  4189.     .flags         = AVFILTER_FLAG_SLICE_THREADS,

  4190.     .process_command = process_command,

  4191. };