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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. 

  56. static const AVOption v360_options[] = {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  95.     {        "2d", "2d mono",                                    0, AV_OPT_TYPE_CONST,  {.i64=STEREO_2D},       0,                   0, FLAGS, "stereo" },

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

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

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

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

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

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

  102.     {    "in_pad", "input cubemap pads",            OFFSET(in_pad), AV_OPT_TYPE_FLOAT,  {.dbl=0.f},           0.f,                 1.f, FLAGS, "in_pad"},

  103.     {   "out_pad", "output cubemap pads",          OFFSET(out_pad), AV_OPT_TYPE_FLOAT,  {.dbl=0.f},           0.f,                 1.f, FLAGS, "out_pad"},

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  118.     { NULL }

  119. };

  120. 

  121. AVFILTER_DEFINE_CLASS(v360);

  122. 

  123. static int query_formats(AVFilterContext *ctx)

  124. {

  125.     static const enum AVPixelFormat pix_fmts[] = {

  126.         // YUVA444

  127.         AV_PIX_FMT_YUVA444P,   AV_PIX_FMT_YUVA444P9,

  128.         AV_PIX_FMT_YUVA444P10, AV_PIX_FMT_YUVA444P12,

  129.         AV_PIX_FMT_YUVA444P16,

  130. 

  131.         // YUVA422

  132.         AV_PIX_FMT_YUVA422P,   AV_PIX_FMT_YUVA422P9,

  133.         AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA422P12,

  134.         AV_PIX_FMT_YUVA422P16,

  135. 

  136.         // YUVA420

  137.         AV_PIX_FMT_YUVA420P,   AV_PIX_FMT_YUVA420P9,

  138.         AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA420P16,

  139. 

  140.         // YUVJ

  141.         AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,

  142.         AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,

  143.         AV_PIX_FMT_YUVJ411P,

  144. 

  145.         // YUV444

  146.         AV_PIX_FMT_YUV444P,   AV_PIX_FMT_YUV444P9,

  147.         AV_PIX_FMT_YUV444P10, AV_PIX_FMT_YUV444P12,

  148.         AV_PIX_FMT_YUV444P14, AV_PIX_FMT_YUV444P16,

  149. 

  150.         // YUV440

  151.         AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV440P10,

  152.         AV_PIX_FMT_YUV440P12,

  153. 

  154.         // YUV422

  155.         AV_PIX_FMT_YUV422P,   AV_PIX_FMT_YUV422P9,

  156.         AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV422P12,

  157.         AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV422P16,

  158. 

  159.         // YUV420

  160.         AV_PIX_FMT_YUV420P,   AV_PIX_FMT_YUV420P9,

  161.         AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV420P12,

  162.         AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV420P16,

  163. 

  164.         // YUV411

  165.         AV_PIX_FMT_YUV411P,

  166. 

  167.         // YUV410

  168.         AV_PIX_FMT_YUV410P,

  169. 

  170.         // GBR

  171.         AV_PIX_FMT_GBRP,   AV_PIX_FMT_GBRP9,

  172.         AV_PIX_FMT_GBRP10, AV_PIX_FMT_GBRP12,

  173.         AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,

  174. 

  175.         // GBRA

  176.         AV_PIX_FMT_GBRAP,   AV_PIX_FMT_GBRAP10,

  177.         AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRAP16,

  178. 

  179.         // GRAY

  180.         AV_PIX_FMT_GRAY8,  AV_PIX_FMT_GRAY9,

  181.         AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12,

  182.         AV_PIX_FMT_GRAY14, AV_PIX_FMT_GRAY16,

  183. 

  184.         AV_PIX_FMT_NONE

  185.     };

  186. 

  187.     AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);

  188.     if (!fmts_list)

  189.         return AVERROR(ENOMEM);

  190.     return ff_set_common_formats(ctx, fmts_list);

  191. }

  192. 

  193. #define DEFINE_REMAP1_LINE(bits, div)                                                           \

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

  195.                                       ptrdiff_t in_linesize,                                    \

  196.                                       const uint16_t *u, const uint16_t *v, const int16_t *ker) \

  197. {                                                                                               \

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

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

  200.                                                                                                 \

  201.     in_linesize /= div;                                                                         \

  202.                                                                                                 \

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

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

  205. }

  206. 

  207. DEFINE_REMAP1_LINE( 8, 1)

  208. DEFINE_REMAP1_LINE(16, 2)

  209. 

  210. typedef struct XYRemap {

  211.     uint16_t u[4][4];

  212.     uint16_t v[4][4];

  213.     float ker[4][4];

  214. } XYRemap;

  215. 

  216. /**

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

  218.  *

  219.  * @param ws size of interpolation window

  220.  * @param bits number of bits per pixel

  221.  */

  222. #define DEFINE_REMAP(ws, bits)                                                                             \

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

  224. {                                                                                                          \

  225.     ThreadData *td = (ThreadData*)arg;                                                                     \

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

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

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

  229.                                                                                                            \

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

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

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

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

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

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

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

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

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

  239.             const uint8_t *src = in->data[plane] + in_offset_h * in_linesize + in_offset_w * (bits >> 3);  \

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

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

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

  243.                                                                                                            \

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

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

  246.                                                                                                            \

  247.             for (int y = slice_start; y < slice_end; y++) {                                                \

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

  249.                 const uint16_t *u = s->u[map] + y * uv_linesize * ws * ws;                                 \

  250.                 const uint16_t *v = s->v[map] + y * uv_linesize * ws * ws;                                 \

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

  252.                                                                                                            \

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

  254.             }                                                                                              \

  255.         }                                                                                                  \

  256.     }                                                                                                      \

  257.                                                                                                            \

  258.     return 0;                                                                                              \

  259. }

  260. 

  261. DEFINE_REMAP(1,  8)

  262. DEFINE_REMAP(2,  8)

  263. DEFINE_REMAP(4,  8)

  264. DEFINE_REMAP(1, 16)

  265. DEFINE_REMAP(2, 16)

  266. DEFINE_REMAP(4, 16)

  267. 

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

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

  270.                                            ptrdiff_t in_linesize,                                          \

  271.                                            const uint16_t *u, const uint16_t *v, const int16_t *ker)       \

  272. {                                                                                                          \

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

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

  275.                                                                                                            \

  276.     in_linesize /= div;                                                                                    \

  277.                                                                                                            \

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

  279.         const uint16_t *uu = u + x * ws * ws;                                                              \

  280.         const uint16_t *vv = v + x * ws * ws;                                                              \

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

  282.         int tmp = 0;                                                                                       \

  283.                                                                                                            \

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

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

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

  287.             }                                                                                              \

  288.         }                                                                                                  \

  289.                                                                                                            \

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

  291.     }                                                                                                      \

  292. }

  293. 

  294. DEFINE_REMAP_LINE(2,  8, 1)

  295. DEFINE_REMAP_LINE(4,  8, 1)

  296. DEFINE_REMAP_LINE(2, 16, 2)

  297. DEFINE_REMAP_LINE(4, 16, 2)

  298. 

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

  300. {

  301.     switch (s->interp) {

  302.     case NEAREST:

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

  304.         break;

  305.     case BILINEAR:

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

  307.         break;

  308.     case BICUBIC:

  309.     case LANCZOS:

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

  311.         break;

  312.     }

  313. 

  314.     if (ARCH_X86)

  315.         ff_v360_init_x86(s, depth);

  316. }

  317. 

  318. /**

  319.  * Save nearest pixel coordinates for remapping.

  320.  *

  321.  * @param du horizontal relative coordinate

  322.  * @param dv vertical relative coordinate

  323.  * @param r_tmp calculated 4x4 window

  324.  * @param u u remap data

  325.  * @param v v remap data

  326.  * @param ker ker remap data

  327.  */

  328. static void nearest_kernel(float du, float dv, const XYRemap *r_tmp,

  329.                            uint16_t *u, uint16_t *v, int16_t *ker)

  330. {

  331.     const int i = roundf(dv) + 1;

  332.     const int j = roundf(du) + 1;

  333. 

  334.     u[0] = r_tmp->u[i][j];

  335.     v[0] = r_tmp->v[i][j];

  336. }

  337. 

  338. /**

  339.  * Calculate kernel for bilinear interpolation.

  340.  *

  341.  * @param du horizontal relative coordinate

  342.  * @param dv vertical relative coordinate

  343.  * @param r_tmp calculated 4x4 window

  344.  * @param u u remap data

  345.  * @param v v remap data

  346.  * @param ker ker remap data

  347.  */

  348. static void bilinear_kernel(float du, float dv, const XYRemap *r_tmp,

  349.                             uint16_t *u, uint16_t *v, int16_t *ker)

  350. {

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

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

  353.             u[i * 2 + j] = r_tmp->u[i + 1][j + 1];

  354.             v[i * 2 + j] = r_tmp->v[i + 1][j + 1];

  355.         }

  356.     }

  357. 

  358.     ker[0] = (1.f - du) * (1.f - dv) * 16384;

  359.     ker[1] =        du  * (1.f - dv) * 16384;

  360.     ker[2] = (1.f - du) *        dv  * 16384;

  361.     ker[3] =        du  *        dv  * 16384;

  362. }

  363. 

  364. /**

  365.  * Calculate 1-dimensional cubic coefficients.

  366.  *

  367.  * @param t relative coordinate

  368.  * @param coeffs coefficients

  369.  */

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

  371. {

  372.     const float tt  = t * t;

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

  374. 

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

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

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

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

  379. }

  380. 

  381. /**

  382.  * Calculate kernel for bicubic interpolation.

  383.  *

  384.  * @param du horizontal relative coordinate

  385.  * @param dv vertical relative coordinate

  386.  * @param r_tmp calculated 4x4 window

  387.  * @param u u remap data

  388.  * @param v v remap data

  389.  * @param ker ker remap data

  390.  */

  391. static void bicubic_kernel(float du, float dv, const XYRemap *r_tmp,

  392.                            uint16_t *u, uint16_t *v, int16_t *ker)

  393. {

  394.     float du_coeffs[4];

  395.     float dv_coeffs[4];

  396. 

  397.     calculate_bicubic_coeffs(du, du_coeffs);

  398.     calculate_bicubic_coeffs(dv, dv_coeffs);

  399. 

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

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

  402.             u[i * 4 + j] = r_tmp->u[i][j];

  403.             v[i * 4 + j] = r_tmp->v[i][j];

  404.             ker[i * 4 + j] = du_coeffs[j] * dv_coeffs[i] * 16384;

  405.         }

  406.     }

  407. }

  408. 

  409. /**

  410.  * Calculate 1-dimensional lanczos coefficients.

  411.  *

  412.  * @param t relative coordinate

  413.  * @param coeffs coefficients

  414.  */

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

  416. {

  417.     float sum = 0.f;

  418. 

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

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

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

  422.             coeffs[i] = 1.f;

  423.         } else {

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

  425.         }

  426.         sum += coeffs[i];

  427.     }

  428. 

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

  430.         coeffs[i] /= sum;

  431.     }

  432. }

  433. 

  434. /**

  435.  * Calculate kernel for lanczos interpolation.

  436.  *

  437.  * @param du horizontal relative coordinate

  438.  * @param dv vertical relative coordinate

  439.  * @param r_tmp calculated 4x4 window

  440.  * @param u u remap data

  441.  * @param v v remap data

  442.  * @param ker ker remap data

  443.  */

  444. static void lanczos_kernel(float du, float dv, const XYRemap *r_tmp,

  445.                            uint16_t *u, uint16_t *v, int16_t *ker)

  446. {

  447.     float du_coeffs[4];

  448.     float dv_coeffs[4];

  449. 

  450.     calculate_lanczos_coeffs(du, du_coeffs);

  451.     calculate_lanczos_coeffs(dv, dv_coeffs);

  452. 

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

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

  455.             u[i * 4 + j] = r_tmp->u[i][j];

  456.             v[i * 4 + j] = r_tmp->v[i][j];

  457.             ker[i * 4 + j] = du_coeffs[j] * dv_coeffs[i] * 16384;

  458.         }

  459.     }

  460. }

  461. 

  462. /**

  463.  * Modulo operation with only positive remainders.

  464.  *

  465.  * @param a dividend

  466.  * @param b divisor

  467.  *

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

  469.  */

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

  471. {

  472.     const int res = a % b;

  473.     if (res < 0) {

  474.         return res + b;

  475.     } else {

  476.         return res;

  477.     }

  478. }

  479. 

  480. /**

  481.  * Convert char to corresponding direction.

  482.  * Used for cubemap options.

  483.  */

  484. static int get_direction(char c)

  485. {

  486.     switch (c) {

  487.     case 'r':

  488.         return RIGHT;

  489.     case 'l':

  490.         return LEFT;

  491.     case 'u':

  492.         return UP;

  493.     case 'd':

  494.         return DOWN;

  495.     case 'f':

  496.         return FRONT;

  497.     case 'b':

  498.         return BACK;

  499.     default:

  500.         return -1;

  501.     }

  502. }

  503. 

  504. /**

  505.  * Convert char to corresponding rotation angle.

  506.  * Used for cubemap options.

  507.  */

  508. static int get_rotation(char c)

  509. {

  510.     switch (c) {

  511.     case '0':

  512.         return ROT_0;

  513.     case '1':

  514.         return ROT_90;

  515.     case '2':

  516.         return ROT_180;

  517.     case '3':

  518.         return ROT_270;

  519.     default:

  520.         return -1;

  521.     }

  522. }

  523. 

  524. /**

  525.  * Convert char to corresponding rotation order.

  526.  */

  527. static int get_rorder(char c)

  528. {

  529.     switch (c) {

  530.     case 'Y':

  531.     case 'y':

  532.         return YAW;

  533.     case 'P':

  534.     case 'p':

  535.         return PITCH;

  536.     case 'R':

  537.     case 'r':

  538.         return ROLL;

  539.     default:

  540.         return -1;

  541.     }

  542. }

  543. 

  544. /**

  545.  * Prepare data for processing cubemap input format.

  546.  *

  547.  * @param ctx filter context

  548.  *

  549.  * @return error code

  550.  */

  551. static int prepare_cube_in(AVFilterContext *ctx)

  552. {

  553.     V360Context *s = ctx->priv;

  554. 

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

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

  557.         int direction;

  558. 

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

  560.             av_log(ctx, AV_LOG_ERROR,

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

  562.             return AVERROR(EINVAL);

  563.         }

  564. 

  565.         direction = get_direction(c);

  566.         if (direction == -1) {

  567.             av_log(ctx, AV_LOG_ERROR,

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

  569.             return AVERROR(EINVAL);

  570.         }

  571. 

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

  573.     }

  574. 

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

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

  577.         int rotation;

  578. 

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

  580.             av_log(ctx, AV_LOG_ERROR,

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

  582.             return AVERROR(EINVAL);

  583.         }

  584. 

  585.         rotation = get_rotation(c);

  586.         if (rotation == -1) {

  587.             av_log(ctx, AV_LOG_ERROR,

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

  589.             return AVERROR(EINVAL);

  590.         }

  591. 

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

  593.     }

  594. 

  595.     return 0;

  596. }

  597. 

  598. /**

  599.  * Prepare data for processing cubemap output format.

  600.  *

  601.  * @param ctx filter context

  602.  *

  603.  * @return error code

  604.  */

  605. static int prepare_cube_out(AVFilterContext *ctx)

  606. {

  607.     V360Context *s = ctx->priv;

  608. 

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

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

  611.         int direction;

  612. 

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

  614.             av_log(ctx, AV_LOG_ERROR,

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

  616.             return AVERROR(EINVAL);

  617.         }

  618. 

  619.         direction = get_direction(c);

  620.         if (direction == -1) {

  621.             av_log(ctx, AV_LOG_ERROR,

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

  623.             return AVERROR(EINVAL);

  624.         }

  625. 

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

  627.     }

  628. 

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

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

  631.         int rotation;

  632. 

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

  634.             av_log(ctx, AV_LOG_ERROR,

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

  636.             return AVERROR(EINVAL);

  637.         }

  638. 

  639.         rotation = get_rotation(c);

  640.         if (rotation == -1) {

  641.             av_log(ctx, AV_LOG_ERROR,

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

  643.             return AVERROR(EINVAL);

  644.         }

  645. 

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

  647.     }

  648. 

  649.     return 0;

  650. }

  651. 

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

  653. {

  654.     float tmp;

  655. 

  656.     switch (rotation) {

  657.     case ROT_0:

  658.         break;

  659.     case ROT_90:

  660.         tmp =  *uf;

  661.         *uf = -*vf;

  662.         *vf =  tmp;

  663.         break;

  664.     case ROT_180:

  665.         *uf = -*uf;

  666.         *vf = -*vf;

  667.         break;

  668.     case ROT_270:

  669.         tmp = -*uf;

  670.         *uf =  *vf;

  671.         *vf =  tmp;

  672.         break;

  673.     default:

  674.         av_assert0(0);

  675.     }

  676. }

  677. 

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

  679. {

  680.     float tmp;

  681. 

  682.     switch (rotation) {

  683.     case ROT_0:

  684.         break;

  685.     case ROT_90:

  686.         tmp = -*uf;

  687.         *uf =  *vf;

  688.         *vf =  tmp;

  689.         break;

  690.     case ROT_180:

  691.         *uf = -*uf;

  692.         *vf = -*vf;

  693.         break;

  694.     case ROT_270:

  695.         tmp =  *uf;

  696.         *uf = -*vf;

  697.         *vf =  tmp;

  698.         break;

  699.     default:

  700.         av_assert0(0);

  701.     }

  702. }

  703. 

  704. /**

  705.  * Normalize vector.

  706.  *

  707.  * @param vec vector

  708.  */

  709. static void normalize_vector(float *vec)

  710. {

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

  712. 

  713.     vec[0] /= norm;

  714.     vec[1] /= norm;

  715.     vec[2] /= norm;

  716. }

  717. 

  718. /**

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

  720.  * Common operation for every cubemap.

  721.  *

  722.  * @param s filter context

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

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

  725.  * @param face face of cubemap

  726.  * @param vec coordinates on sphere

  727.  */

  728. static void cube_to_xyz(const V360Context *s,

  729.                         float uf, float vf, int face,

  730.                         float *vec)

  731. {

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

  733.     float l_x, l_y, l_z;

  734. 

  735.     uf /= (1.f - s->out_pad);

  736.     vf /= (1.f - s->out_pad);

  737. 

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

  739. 

  740.     switch (direction) {

  741.     case RIGHT:

  742.         l_x =  1.f;

  743.         l_y = -vf;

  744.         l_z =  uf;

  745.         break;

  746.     case LEFT:

  747.         l_x = -1.f;

  748.         l_y = -vf;

  749.         l_z = -uf;

  750.         break;

  751.     case UP:

  752.         l_x =  uf;

  753.         l_y =  1.f;

  754.         l_z = -vf;

  755.         break;

  756.     case DOWN:

  757.         l_x =  uf;

  758.         l_y = -1.f;

  759.         l_z =  vf;

  760.         break;

  761.     case FRONT:

  762.         l_x =  uf;

  763.         l_y = -vf;

  764.         l_z = -1.f;

  765.         break;

  766.     case BACK:

  767.         l_x = -uf;

  768.         l_y = -vf;

  769.         l_z =  1.f;

  770.         break;

  771.     }

  772. 

  773.     vec[0] = l_x;

  774.     vec[1] = l_y;

  775.     vec[2] = l_z;

  776. 

  777.     normalize_vector(vec);

  778. }

  779. 

  780. /**

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

  782.  * Common operation for every cubemap.

  783.  *

  784.  * @param s filter context

  785.  * @param vec coordinated on sphere

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

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

  788.  * @param direction direction of view

  789.  */

  790. static void xyz_to_cube(const V360Context *s,

  791.                         const float *vec,

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

  793. {

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

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

  796.     float phi_norm, theta_threshold;

  797.     int face;

  798. 

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

  800.         *direction = FRONT;

  801.         phi_norm = phi;

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

  803.         *direction = LEFT;

  804.         phi_norm = phi + M_PI_2;

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

  806.         *direction = RIGHT;

  807.         phi_norm = phi - M_PI_2;

  808.     } else {

  809.         *direction = BACK;

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

  811.     }

  812. 

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

  814.     if (theta > theta_threshold) {

  815.         *direction = DOWN;

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

  817.         *direction = UP;

  818.     }

  819. 

  820.     switch (*direction) {

  821.     case RIGHT:

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

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

  824.         break;

  825.     case LEFT:

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

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

  828.         break;

  829.     case UP:

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

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

  832.         break;

  833.     case DOWN:

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

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

  836.         break;

  837.     case FRONT:

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

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

  840.         break;

  841.     case BACK:

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

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

  844.         break;

  845.     default:

  846.         av_assert0(0);

  847.     }

  848. 

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

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

  851. 

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

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

  854. }

  855. 

  856. /**

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

  858.  * Used for calculation of interpolation window.

  859.  *

  860.  * @param s filter context

  861.  * @param uf horizontal cubemap coordinate

  862.  * @param vf vertical cubemap coordinate

  863.  * @param direction direction of view

  864.  * @param new_uf new horizontal cubemap coordinate

  865.  * @param new_vf new vertical cubemap coordinate

  866.  * @param face face position on cubemap

  867.  */

  868. static void process_cube_coordinates(const V360Context *s,

  869.                                      float uf, float vf, int direction,

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

  871. {

  872.     /*

  873.      *  Cubemap orientation

  874.      *

  875.      *           width

  876.      *         <------->

  877.      *         +-------+

  878.      *         |       |                              U

  879.      *         | up    |                   h       ------->

  880.      * +-------+-------+-------+-------+ ^ e      |

  881.      * |       |       |       |       | | i    V |

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

  883.      * +-------+-------+-------+-------+ v h      v

  884.      *         |       |                   t

  885.      *         | down  |

  886.      *         +-------+

  887.      */

  888. 

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

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

  891. 

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

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

  894.         *new_uf = uf;

  895.         *new_vf = vf;

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

  897.         uf += 2.f;

  898.         switch (direction) {

  899.         case RIGHT:

  900.             direction = FRONT;

  901.             *new_uf =  uf;

  902.             *new_vf =  vf;

  903.             break;

  904.         case LEFT:

  905.             direction = BACK;

  906.             *new_uf =  uf;

  907.             *new_vf =  vf;

  908.             break;

  909.         case UP:

  910.             direction = LEFT;

  911.             *new_uf =  vf;

  912.             *new_vf = -uf;

  913.             break;

  914.         case DOWN:

  915.             direction = LEFT;

  916.             *new_uf = -vf;

  917.             *new_vf =  uf;

  918.             break;

  919.         case FRONT:

  920.             direction = LEFT;

  921.             *new_uf =  uf;

  922.             *new_vf =  vf;

  923.             break;

  924.         case BACK:

  925.             direction = RIGHT;

  926.             *new_uf =  uf;

  927.             *new_vf =  vf;

  928.             break;

  929.         default:

  930.             av_assert0(0);

  931.         }

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

  933.         uf -= 2.f;

  934.         switch (direction) {

  935.         case RIGHT:

  936.             direction = BACK;

  937.             *new_uf =  uf;

  938.             *new_vf =  vf;

  939.             break;

  940.         case LEFT:

  941.             direction = FRONT;

  942.             *new_uf =  uf;

  943.             *new_vf =  vf;

  944.             break;

  945.         case UP:

  946.             direction = RIGHT;

  947.             *new_uf = -vf;

  948.             *new_vf =  uf;

  949.             break;

  950.         case DOWN:

  951.             direction = RIGHT;

  952.             *new_uf =  vf;

  953.             *new_vf = -uf;

  954.             break;

  955.         case FRONT:

  956.             direction = RIGHT;

  957.             *new_uf =  uf;

  958.             *new_vf =  vf;

  959.             break;

  960.         case BACK:

  961.             direction = LEFT;

  962.             *new_uf =  uf;

  963.             *new_vf =  vf;

  964.             break;

  965.         default:

  966.             av_assert0(0);

  967.         }

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

  969.         vf += 2.f;

  970.         switch (direction) {

  971.         case RIGHT:

  972.             direction = UP;

  973.             *new_uf =  vf;

  974.             *new_vf = -uf;

  975.             break;

  976.         case LEFT:

  977.             direction = UP;

  978.             *new_uf = -vf;

  979.             *new_vf =  uf;

  980.             break;

  981.         case UP:

  982.             direction = BACK;

  983.             *new_uf = -uf;

  984.             *new_vf = -vf;

  985.             break;

  986.         case DOWN:

  987.             direction = FRONT;

  988.             *new_uf =  uf;

  989.             *new_vf =  vf;

  990.             break;

  991.         case FRONT:

  992.             direction = UP;

  993.             *new_uf =  uf;

  994.             *new_vf =  vf;

  995.             break;

  996.         case BACK:

  997.             direction = UP;

  998.             *new_uf = -uf;

  999.             *new_vf = -vf;

  1000.             break;

  1001.         default:

  1002.             av_assert0(0);

  1003.         }

  1004.     } else if (vf >= 1.f) {

  1005.         vf -= 2.f;

  1006.         switch (direction) {

  1007.         case RIGHT:

  1008.             direction = DOWN;

  1009.             *new_uf = -vf;

  1010.             *new_vf =  uf;

  1011.             break;

  1012.         case LEFT:

  1013.             direction = DOWN;

  1014.             *new_uf =  vf;

  1015.             *new_vf = -uf;

  1016.             break;

  1017.         case UP:

  1018.             direction = FRONT;

  1019.             *new_uf =  uf;

  1020.             *new_vf =  vf;

  1021.             break;

  1022.         case DOWN:

  1023.             direction = BACK;

  1024.             *new_uf = -uf;

  1025.             *new_vf = -vf;

  1026.             break;

  1027.         case FRONT:

  1028.             direction = DOWN;

  1029.             *new_uf =  uf;

  1030.             *new_vf =  vf;

  1031.             break;

  1032.         case BACK:

  1033.             direction = DOWN;

  1034.             *new_uf = -uf;

  1035.             *new_vf = -vf;

  1036.             break;

  1037.         default:

  1038.             av_assert0(0);

  1039.         }

  1040.     } else {

  1041.         // Inside cube face

  1042.         *new_uf = uf;

  1043.         *new_vf = vf;

  1044.     }

  1045. 

  1046.     *face = s->in_cubemap_face_order[direction];

  1047.     rotate_cube_face(new_uf, new_vf, s->in_cubemap_face_rotation[*face]);

  1048. }

  1049. 

  1050. /**

  1051.  * Calculate 3D coordinates on sphere for corresponding frame position in cubemap3x2 format.

  1052.  *

  1053.  * @param s filter context

  1054.  * @param i horizontal position on frame [0, width)

  1055.  * @param j vertical position on frame [0, height)

  1056.  * @param width frame width

  1057.  * @param height frame height

  1058.  * @param vec coordinates on sphere

  1059.  */

  1060. static void cube3x2_to_xyz(const V360Context *s,

  1061.                            int i, int j, int width, int height,

  1062.                            float *vec)

  1063. {

  1064.     const float ew = width  / 3.f;

  1065.     const float eh = height / 2.f;

  1066. 

  1067.     const int u_face = floorf(i / ew);

  1068.     const int v_face = floorf(j / eh);

  1069.     const int face = u_face + 3 * v_face;

  1070. 

  1071.     const int u_shift = ceilf(ew * u_face);

  1072.     const int v_shift = ceilf(eh * v_face);

  1073.     const int ewi = ceilf(ew * (u_face + 1)) - u_shift;

  1074.     const int ehi = ceilf(eh * (v_face + 1)) - v_shift;

  1075. 

  1076.     const float uf = 2.f * (i - u_shift) / ewi - 1.f;

  1077.     const float vf = 2.f * (j - v_shift) / ehi - 1.f;

  1078. 

  1079.     cube_to_xyz(s, uf, vf, face, vec);

  1080. }

  1081. 

  1082. /**

  1083.  * Calculate frame position in cubemap3x2 format for corresponding 3D coordinates on sphere.

  1084.  *

  1085.  * @param s filter context

  1086.  * @param vec coordinates on sphere

  1087.  * @param width frame width

  1088.  * @param height frame height

  1089.  * @param us horizontal coordinates for interpolation window

  1090.  * @param vs vertical coordinates for interpolation window

  1091.  * @param du horizontal relative coordinate

  1092.  * @param dv vertical relative coordinate

  1093.  */

  1094. static void xyz_to_cube3x2(const V360Context *s,

  1095.                            const float *vec, int width, int height,

  1096.                            uint16_t us[4][4], uint16_t vs[4][4], float *du, float *dv)

  1097. {

  1098.     const float ew = width  / 3.f;

  1099.     const float eh = height / 2.f;

  1100.     float uf, vf;

  1101.     int ui, vi;

  1102.     int ewi, ehi;

  1103.     int direction, face;

  1104.     int u_face, v_face;

  1105. 

  1106.     xyz_to_cube(s, vec, &uf, &vf, &direction);

  1107. 

  1108.     uf *= (1.f - s->in_pad);

  1109.     vf *= (1.f - s->in_pad);

  1110. 

  1111.     face = s->in_cubemap_face_order[direction];

  1112.     u_face = face % 3;

  1113.     v_face = face / 3;

  1114.     ewi = ceilf(ew * (u_face + 1)) - ceilf(ew * u_face);

  1115.     ehi = ceilf(eh * (v_face + 1)) - ceilf(eh * v_face);

  1116. 

  1117.     uf = 0.5f * ewi * (uf + 1.f);

  1118.     vf = 0.5f * ehi * (vf + 1.f);

  1119. 

  1120.     ui = floorf(uf);

  1121.     vi = floorf(vf);

  1122. 

  1123.     *du = uf - ui;

  1124.     *dv = vf - vi;

  1125. 

  1126.     for (int i = -1; i < 3; i++) {

  1127.         for (int j = -1; j < 3; j++) {

  1128.             int new_ui = ui + j;

  1129.             int new_vi = vi + i;

  1130.             int u_shift, v_shift;

  1131.             int new_ewi, new_ehi;

  1132. 

  1133.             if (new_ui >= 0 && new_ui < ewi && new_vi >= 0 && new_vi < ehi) {

  1134.                 face = s->in_cubemap_face_order[direction];

  1135. 

  1136.                 u_face = face % 3;

  1137.                 v_face = face / 3;

  1138.                 u_shift = ceilf(ew * u_face);

  1139.                 v_shift = ceilf(eh * v_face);

  1140.             } else {

  1141.                 uf = 2.f * new_ui / ewi - 1.f;

  1142.                 vf = 2.f * new_vi / ehi - 1.f;

  1143. 

  1144.                 uf /= (1.f - s->in_pad);

  1145.                 vf /= (1.f - s->in_pad);

  1146. 

  1147.                 process_cube_coordinates(s, uf, vf, direction, &uf, &vf, &face);

  1148. 

  1149.                 uf *= (1.f - s->in_pad);

  1150.                 vf *= (1.f - s->in_pad);

  1151. 

  1152.                 u_face = face % 3;

  1153.                 v_face = face / 3;

  1154.                 u_shift = ceilf(ew * u_face);

  1155.                 v_shift = ceilf(eh * v_face);

  1156.                 new_ewi = ceilf(ew * (u_face + 1)) - u_shift;

  1157.                 new_ehi = ceilf(eh * (v_face + 1)) - v_shift;

  1158. 

  1159.                 new_ui = av_clip(roundf(0.5f * new_ewi * (uf + 1.f)), 0, new_ewi - 1);

  1160.                 new_vi = av_clip(roundf(0.5f * new_ehi * (vf + 1.f)), 0, new_ehi - 1);

  1161.             }

  1162. 

  1163.             us[i + 1][j + 1] = u_shift + new_ui;

  1164.             vs[i + 1][j + 1] = v_shift + new_vi;

  1165.         }

  1166.     }

  1167. }

  1168. 

  1169. /**

  1170.  * Calculate 3D coordinates on sphere for corresponding frame position in cubemap1x6 format.

  1171.  *

  1172.  * @param s filter context

  1173.  * @param i horizontal position on frame [0, width)

  1174.  * @param j vertical position on frame [0, height)

  1175.  * @param width frame width

  1176.  * @param height frame height

  1177.  * @param vec coordinates on sphere

  1178.  */

  1179. static void cube1x6_to_xyz(const V360Context *s,

  1180.                            int i, int j, int width, int height,

  1181.                            float *vec)

  1182. {

  1183.     const float ew = width;

  1184.     const float eh = height / 6.f;

  1185. 

  1186.     const int face = floorf(j / eh);

  1187. 

  1188.     const int v_shift = ceilf(eh * face);

  1189.     const int ehi = ceilf(eh * (face + 1)) - v_shift;

  1190. 

  1191.     const float uf = 2.f *  i            / ew  - 1.f;

  1192.     const float vf = 2.f * (j - v_shift) / ehi - 1.f;

  1193. 

  1194.     cube_to_xyz(s, uf, vf, face, vec);

  1195. }

  1196. 

  1197. /**

  1198.  * Calculate 3D coordinates on sphere for corresponding frame position in cubemap6x1 format.

  1199.  *

  1200.  * @param s filter context

  1201.  * @param i horizontal position on frame [0, width)

  1202.  * @param j vertical position on frame [0, height)

  1203.  * @param width frame width

  1204.  * @param height frame height

  1205.  * @param vec coordinates on sphere

  1206.  */

  1207. static void cube6x1_to_xyz(const V360Context *s,

  1208.                            int i, int j, int width, int height,

  1209.                            float *vec)

  1210. {

  1211.     const float ew = width / 6.f;

  1212.     const float eh = height;

  1213. 

  1214.     const int face = floorf(i / ew);

  1215. 

  1216.     const int u_shift = ceilf(ew * face);

  1217.     const int ewi = ceilf(ew * (face + 1)) - u_shift;

  1218. 

  1219.     const float uf = 2.f * (i - u_shift) / ewi - 1.f;

  1220.     const float vf = 2.f *  j            / eh  - 1.f;

  1221. 

  1222.     cube_to_xyz(s, uf, vf, face, vec);

  1223. }

  1224. 

  1225. /**

  1226.  * Calculate frame position in cubemap1x6 format for corresponding 3D coordinates on sphere.

  1227.  *

  1228.  * @param s filter context

  1229.  * @param vec coordinates on sphere

  1230.  * @param width frame width

  1231.  * @param height frame height

  1232.  * @param us horizontal coordinates for interpolation window

  1233.  * @param vs vertical coordinates for interpolation window

  1234.  * @param du horizontal relative coordinate

  1235.  * @param dv vertical relative coordinate

  1236.  */

  1237. static void xyz_to_cube1x6(const V360Context *s,

  1238.                            const float *vec, int width, int height,

  1239.                            uint16_t us[4][4], uint16_t vs[4][4], float *du, float *dv)

  1240. {

  1241.     const float eh = height / 6.f;

  1242.     const int ewi = width;

  1243.     float uf, vf;

  1244.     int ui, vi;

  1245.     int ehi;

  1246.     int direction, face;

  1247. 

  1248.     xyz_to_cube(s, vec, &uf, &vf, &direction);

  1249. 

  1250.     uf *= (1.f - s->in_pad);

  1251.     vf *= (1.f - s->in_pad);

  1252. 

  1253.     face = s->in_cubemap_face_order[direction];

  1254.     ehi = ceilf(eh * (face + 1)) - ceilf(eh * face);

  1255. 

  1256.     uf = 0.5f * ewi * (uf + 1.f);

  1257.     vf = 0.5f * ehi * (vf + 1.f);

  1258. 

  1259.     ui = floorf(uf);

  1260.     vi = floorf(vf);

  1261. 

  1262.     *du = uf - ui;

  1263.     *dv = vf - vi;

  1264. 

  1265.     for (int i = -1; i < 3; i++) {

  1266.         for (int j = -1; j < 3; j++) {

  1267.             int new_ui = ui + j;

  1268.             int new_vi = vi + i;

  1269.             int v_shift;

  1270.             int new_ehi;

  1271. 

  1272.             if (new_ui >= 0 && new_ui < ewi && new_vi >= 0 && new_vi < ehi) {

  1273.                 face = s->in_cubemap_face_order[direction];

  1274. 

  1275.                 v_shift = ceilf(eh * face);

  1276.             } else {

  1277.                 uf = 2.f * new_ui / ewi - 1.f;

  1278.                 vf = 2.f * new_vi / ehi - 1.f;

  1279. 

  1280.                 uf /= (1.f - s->in_pad);

  1281.                 vf /= (1.f - s->in_pad);

  1282. 

  1283.                 process_cube_coordinates(s, uf, vf, direction, &uf, &vf, &face);

  1284. 

  1285.                 uf *= (1.f - s->in_pad);

  1286.                 vf *= (1.f - s->in_pad);

  1287. 

  1288.                 v_shift = ceilf(eh * face);

  1289.                 new_ehi = ceilf(eh * (face + 1)) - v_shift;

  1290. 

  1291.                 new_ui = av_clip(roundf(0.5f *     ewi * (uf + 1.f)), 0,     ewi - 1);

  1292.                 new_vi = av_clip(roundf(0.5f * new_ehi * (vf + 1.f)), 0, new_ehi - 1);

  1293.             }

  1294. 

  1295.             us[i + 1][j + 1] =           new_ui;

  1296.             vs[i + 1][j + 1] = v_shift + new_vi;

  1297.         }

  1298.     }

  1299. }

  1300. 

  1301. /**

  1302.  * Calculate frame position in cubemap6x1 format for corresponding 3D coordinates on sphere.

  1303.  *

  1304.  * @param s filter context

  1305.  * @param vec coordinates on sphere

  1306.  * @param width frame width

  1307.  * @param height frame height

  1308.  * @param us horizontal coordinates for interpolation window

  1309.  * @param vs vertical coordinates for interpolation window

  1310.  * @param du horizontal relative coordinate

  1311.  * @param dv vertical relative coordinate

  1312.  */

  1313. static void xyz_to_cube6x1(const V360Context *s,

  1314.                            const float *vec, int width, int height,

  1315.                            uint16_t us[4][4], uint16_t vs[4][4], float *du, float *dv)

  1316. {

  1317.     const float ew = width / 6.f;

  1318.     const int ehi = height;

  1319.     float uf, vf;

  1320.     int ui, vi;

  1321.     int ewi;

  1322.     int direction, face;

  1323. 

  1324.     xyz_to_cube(s, vec, &uf, &vf, &direction);

  1325. 

  1326.     uf *= (1.f - s->in_pad);

  1327.     vf *= (1.f - s->in_pad);

  1328. 

  1329.     face = s->in_cubemap_face_order[direction];

  1330.     ewi = ceilf(ew * (face + 1)) - ceilf(ew * face);

  1331. 

  1332.     uf = 0.5f * ewi * (uf + 1.f);

  1333.     vf = 0.5f * ehi * (vf + 1.f);

  1334. 

  1335.     ui = floorf(uf);

  1336.     vi = floorf(vf);

  1337. 

  1338.     *du = uf - ui;

  1339.     *dv = vf - vi;

  1340. 

  1341.     for (int i = -1; i < 3; i++) {

  1342.         for (int j = -1; j < 3; j++) {

  1343.             int new_ui = ui + j;

  1344.             int new_vi = vi + i;

  1345.             int u_shift;

  1346.             int new_ewi;

  1347. 

  1348.             if (new_ui >= 0 && new_ui < ewi && new_vi >= 0 && new_vi < ehi) {

  1349.                 face = s->in_cubemap_face_order[direction];

  1350. 

  1351.                 u_shift = ceilf(ew * face);

  1352.             } else {

  1353.                 uf = 2.f * new_ui / ewi - 1.f;

  1354.                 vf = 2.f * new_vi / ehi - 1.f;

  1355. 

  1356.                 uf /= (1.f - s->in_pad);

  1357.                 vf /= (1.f - s->in_pad);

  1358. 

  1359.                 process_cube_coordinates(s, uf, vf, direction, &uf, &vf, &face);

  1360. 

  1361.                 uf *= (1.f - s->in_pad);

  1362.                 vf *= (1.f - s->in_pad);

  1363. 

  1364.                 u_shift = ceilf(ew * face);

  1365.                 new_ewi = ceilf(ew * (face + 1)) - u_shift;

  1366. 

  1367.                 new_ui = av_clip(roundf(0.5f * new_ewi * (uf + 1.f)), 0, new_ewi - 1);

  1368.                 new_vi = av_clip(roundf(0.5f *     ehi * (vf + 1.f)), 0,     ehi - 1);

  1369.             }

  1370. 

  1371.             us[i + 1][j + 1] = u_shift + new_ui;

  1372.             vs[i + 1][j + 1] =           new_vi;

  1373.         }

  1374.     }

  1375. }

  1376. 

  1377. /**

  1378.  * Calculate 3D coordinates on sphere for corresponding frame position in equirectangular format.

  1379.  *

  1380.  * @param s filter context

  1381.  * @param i horizontal position on frame [0, width)

  1382.  * @param j vertical position on frame [0, height)

  1383.  * @param width frame width

  1384.  * @param height frame height

  1385.  * @param vec coordinates on sphere

  1386.  */

  1387. static void equirect_to_xyz(const V360Context *s,

  1388.                             int i, int j, int width, int height,

  1389.                             float *vec)

  1390. {

  1391.     const float phi   = ((2.f * i) / width  - 1.f) * M_PI;

  1392.     const float theta = ((2.f * j) / height - 1.f) * M_PI_2;

  1393. 

  1394.     const float sin_phi   = sinf(phi);

  1395.     const float cos_phi   = cosf(phi);

  1396.     const float sin_theta = sinf(theta);

  1397.     const float cos_theta = cosf(theta);

  1398. 

  1399.     vec[0] =  cos_theta * sin_phi;

  1400.     vec[1] = -sin_theta;

  1401.     vec[2] = -cos_theta * cos_phi;

  1402. }

  1403. 

  1404. /**

  1405.  * Prepare data for processing stereographic output format.

  1406.  *

  1407.  * @param ctx filter context

  1408.  *

  1409.  * @return error code

  1410.  */

  1411. static int prepare_stereographic_out(AVFilterContext *ctx)

  1412. {

  1413.     V360Context *s = ctx->priv;

  1414. 

  1415.     const float h_angle = tanf(FFMIN(s->h_fov, 359.f) * M_PI / 720.f);

  1416.     const float v_angle = tanf(FFMIN(s->v_fov, 359.f) * M_PI / 720.f);

  1417. 

  1418.     s->flat_range[0] = h_angle;

  1419.     s->flat_range[1] = v_angle;

  1420. 

  1421.     return 0;

  1422. }

  1423. 

  1424. /**

  1425.  * Calculate 3D coordinates on sphere for corresponding frame position in stereographic format.

  1426.  *

  1427.  * @param s filter context

  1428.  * @param i horizontal position on frame [0, width)

  1429.  * @param j vertical position on frame [0, height)

  1430.  * @param width frame width

  1431.  * @param height frame height

  1432.  * @param vec coordinates on sphere

  1433.  */

  1434. static void stereographic_to_xyz(const V360Context *s,

  1435.                                  int i, int j, int width, int height,

  1436.                                  float *vec)

  1437. {

  1438.     const float x = ((2.f * i) / width  - 1.f) * s->flat_range[0];

  1439.     const float y = ((2.f * j) / height - 1.f) * s->flat_range[1];

  1440.     const float xy = x * x + y * y;

  1441. 

  1442.     vec[0] = 2.f * x / (1.f + xy);

  1443.     vec[1] = (-1.f + xy) / (1.f + xy);

  1444.     vec[2] = 2.f * y / (1.f + xy);

  1445. 

  1446.     normalize_vector(vec);

  1447. }

  1448. 

  1449. /**

  1450.  * Calculate frame position in stereographic format for corresponding 3D coordinates on sphere.

  1451.  *

  1452.  * @param s filter context

  1453.  * @param vec coordinates on sphere

  1454.  * @param width frame width

  1455.  * @param height frame height

  1456.  * @param us horizontal coordinates for interpolation window

  1457.  * @param vs vertical coordinates for interpolation window

  1458.  * @param du horizontal relative coordinate

  1459.  * @param dv vertical relative coordinate

  1460.  */

  1461. static void xyz_to_stereographic(const V360Context *s,

  1462.                                  const float *vec, int width, int height,

  1463.                                  uint16_t us[4][4], uint16_t vs[4][4], float *du, float *dv)

  1464. {

  1465.     const float x = av_clipf(vec[0] / (1.f - vec[1]), -1.f, 1.f) * s->input_mirror_modifier[0];

  1466.     const float y = av_clipf(vec[2] / (1.f - vec[1]), -1.f, 1.f) * s->input_mirror_modifier[1];

  1467.     float uf, vf;

  1468.     int ui, vi;

  1469. 

  1470.     uf = (x + 1.f) * width  / 2.f;

  1471.     vf = (y + 1.f) * height / 2.f;

  1472.     ui = floorf(uf);

  1473.     vi = floorf(vf);

  1474. 

  1475.     *du = uf - ui;

  1476.     *dv = vf - vi;

  1477. 

  1478.     for (int i = -1; i < 3; i++) {

  1479.         for (int j = -1; j < 3; j++) {

  1480.             us[i + 1][j + 1] = av_clip(ui + j, 0, width - 1);

  1481.             vs[i + 1][j + 1] = av_clip(vi + i, 0, height - 1);

  1482.         }

  1483.     }

  1484. }

  1485. 

  1486. /**

  1487.  * Calculate frame position in equirectangular format for corresponding 3D coordinates on sphere.

  1488.  *

  1489.  * @param s filter context

  1490.  * @param vec coordinates on sphere

  1491.  * @param width frame width

  1492.  * @param height frame height

  1493.  * @param us horizontal coordinates for interpolation window

  1494.  * @param vs vertical coordinates for interpolation window

  1495.  * @param du horizontal relative coordinate

  1496.  * @param dv vertical relative coordinate

  1497.  */

  1498. static void xyz_to_equirect(const V360Context *s,

  1499.                             const float *vec, int width, int height,

  1500.                             uint16_t us[4][4], uint16_t vs[4][4], float *du, float *dv)

  1501. {

  1502.     const float phi   = atan2f(vec[0], -vec[2]) * s->input_mirror_modifier[0];

  1503.     const float theta = asinf(-vec[1]) * s->input_mirror_modifier[1];

  1504.     float uf, vf;

  1505.     int ui, vi;

  1506. 

  1507.     uf = (phi   / M_PI   + 1.f) * width  / 2.f;

  1508.     vf = (theta / M_PI_2 + 1.f) * height / 2.f;

  1509.     ui = floorf(uf);

  1510.     vi = floorf(vf);

  1511. 

  1512.     *du = uf - ui;

  1513.     *dv = vf - vi;

  1514. 

  1515.     for (int i = -1; i < 3; i++) {

  1516.         for (int j = -1; j < 3; j++) {

  1517.             us[i + 1][j + 1] = mod(ui + j, width);

  1518.             vs[i + 1][j + 1] = av_clip(vi + i, 0, height - 1);

  1519.         }

  1520.     }

  1521. }

  1522. 

  1523. /**

  1524.  * Prepare data for processing equi-angular cubemap input format.

  1525.  *

  1526.  * @param ctx filter context

  1527. 

  1528.  * @return error code

  1529.  */

  1530. static int prepare_eac_in(AVFilterContext *ctx)

  1531. {

  1532.     V360Context *s = ctx->priv;

  1533. 

  1534.     if (s->ih_flip && s->iv_flip) {

  1535.         s->in_cubemap_face_order[RIGHT] = BOTTOM_LEFT;

  1536.         s->in_cubemap_face_order[LEFT]  = BOTTOM_RIGHT;

  1537.         s->in_cubemap_face_order[UP]    = TOP_LEFT;

  1538.         s->in_cubemap_face_order[DOWN]  = TOP_RIGHT;

  1539.         s->in_cubemap_face_order[FRONT] = BOTTOM_MIDDLE;

  1540.         s->in_cubemap_face_order[BACK]  = TOP_MIDDLE;

  1541.     } else if (s->ih_flip) {

  1542.         s->in_cubemap_face_order[RIGHT] = TOP_LEFT;

  1543.         s->in_cubemap_face_order[LEFT]  = TOP_RIGHT;

  1544.         s->in_cubemap_face_order[UP]    = BOTTOM_LEFT;

  1545.         s->in_cubemap_face_order[DOWN]  = BOTTOM_RIGHT;

  1546.         s->in_cubemap_face_order[FRONT] = TOP_MIDDLE;

  1547.         s->in_cubemap_face_order[BACK]  = BOTTOM_MIDDLE;

  1548.     } else if (s->iv_flip) {

  1549.         s->in_cubemap_face_order[RIGHT] = BOTTOM_RIGHT;

  1550.         s->in_cubemap_face_order[LEFT]  = BOTTOM_LEFT;

  1551.         s->in_cubemap_face_order[UP]    = TOP_RIGHT;

  1552.         s->in_cubemap_face_order[DOWN]  = TOP_LEFT;

  1553.         s->in_cubemap_face_order[FRONT] = BOTTOM_MIDDLE;

  1554.         s->in_cubemap_face_order[BACK]  = TOP_MIDDLE;

  1555.     } else {

  1556.         s->in_cubemap_face_order[RIGHT] = TOP_RIGHT;

  1557.         s->in_cubemap_face_order[LEFT]  = TOP_LEFT;

  1558.         s->in_cubemap_face_order[UP]    = BOTTOM_RIGHT;

  1559.         s->in_cubemap_face_order[DOWN]  = BOTTOM_LEFT;

  1560.         s->in_cubemap_face_order[FRONT] = TOP_MIDDLE;

  1561.         s->in_cubemap_face_order[BACK]  = BOTTOM_MIDDLE;

  1562.     }

  1563. 

  1564.     if (s->iv_flip) {

  1565.         s->in_cubemap_face_rotation[TOP_LEFT]      = ROT_270;

  1566.         s->in_cubemap_face_rotation[TOP_MIDDLE]    = ROT_90;

  1567.         s->in_cubemap_face_rotation[TOP_RIGHT]     = ROT_270;

  1568.         s->in_cubemap_face_rotation[BOTTOM_LEFT]   = ROT_0;

  1569.         s->in_cubemap_face_rotation[BOTTOM_MIDDLE] = ROT_0;

  1570.         s->in_cubemap_face_rotation[BOTTOM_RIGHT]  = ROT_0;

  1571.     } else {

  1572.         s->in_cubemap_face_rotation[TOP_LEFT]      = ROT_0;

  1573.         s->in_cubemap_face_rotation[TOP_MIDDLE]    = ROT_0;

  1574.         s->in_cubemap_face_rotation[TOP_RIGHT]     = ROT_0;

  1575.         s->in_cubemap_face_rotation[BOTTOM_LEFT]   = ROT_270;

  1576.         s->in_cubemap_face_rotation[BOTTOM_MIDDLE] = ROT_90;

  1577.         s->in_cubemap_face_rotation[BOTTOM_RIGHT]  = ROT_270;

  1578.     }

  1579. 

  1580.     return 0;

  1581. }

  1582. 

  1583. /**

  1584.  * Prepare data for processing equi-angular cubemap output format.

  1585.  *

  1586.  * @param ctx filter context

  1587.  *

  1588.  * @return error code

  1589.  */

  1590. static int prepare_eac_out(AVFilterContext *ctx)

  1591. {

  1592.     V360Context *s = ctx->priv;

  1593. 

  1594.     s->out_cubemap_direction_order[TOP_LEFT]      = LEFT;

  1595.     s->out_cubemap_direction_order[TOP_MIDDLE]    = FRONT;

  1596.     s->out_cubemap_direction_order[TOP_RIGHT]     = RIGHT;

  1597.     s->out_cubemap_direction_order[BOTTOM_LEFT]   = DOWN;

  1598.     s->out_cubemap_direction_order[BOTTOM_MIDDLE] = BACK;

  1599.     s->out_cubemap_direction_order[BOTTOM_RIGHT]  = UP;

  1600. 

  1601.     s->out_cubemap_face_rotation[TOP_LEFT]      = ROT_0;

  1602.     s->out_cubemap_face_rotation[TOP_MIDDLE]    = ROT_0;

  1603.     s->out_cubemap_face_rotation[TOP_RIGHT]     = ROT_0;

  1604.     s->out_cubemap_face_rotation[BOTTOM_LEFT]   = ROT_270;

  1605.     s->out_cubemap_face_rotation[BOTTOM_MIDDLE] = ROT_90;

  1606.     s->out_cubemap_face_rotation[BOTTOM_RIGHT]  = ROT_270;

  1607. 

  1608.     return 0;

  1609. }

  1610. 

  1611. /**

  1612.  * Calculate 3D coordinates on sphere for corresponding frame position in equi-angular cubemap format.

  1613.  *

  1614.  * @param s filter context

  1615.  * @param i horizontal position on frame [0, width)

  1616.  * @param j vertical position on frame [0, height)

  1617.  * @param width frame width

  1618.  * @param height frame height

  1619.  * @param vec coordinates on sphere

  1620.  */

  1621. static void eac_to_xyz(const V360Context *s,

  1622.                        int i, int j, int width, int height,

  1623.                        float *vec)

  1624. {

  1625.     const float pixel_pad = 2;

  1626.     const float u_pad = pixel_pad / width;

  1627.     const float v_pad = pixel_pad / height;

  1628. 

  1629.     int u_face, v_face, face;

  1630. 

  1631.     float l_x, l_y, l_z;

  1632. 

  1633.     float uf = (float)i / width;

  1634.     float vf = (float)j / height;

  1635. 

  1636.     // EAC has 2-pixel padding on faces except between faces on the same row

  1637.     // Padding pixels seems not to be stretched with tangent as regular pixels

  1638.     // Formulas below approximate original padding as close as I could get experimentally

  1639. 

  1640.     // Horizontal padding

  1641.     uf = 3.f * (uf - u_pad) / (1.f - 2.f * u_pad);

  1642.     if (uf < 0.f) {

  1643.         u_face = 0;

  1644.         uf -= 0.5f;

  1645.     } else if (uf >= 3.f) {

  1646.         u_face = 2;

  1647.         uf -= 2.5f;

  1648.     } else {

  1649.         u_face = floorf(uf);

  1650.         uf = fmodf(uf, 1.f) - 0.5f;

  1651.     }

  1652. 

  1653.     // Vertical padding

  1654.     v_face = floorf(vf * 2.f);

  1655.     vf = (vf - v_pad - 0.5f * v_face) / (0.5f - 2.f * v_pad) - 0.5f;

  1656. 

  1657.     if (uf >= -0.5f && uf < 0.5f) {

  1658.         uf = tanf(M_PI_2 * uf);

  1659.     } else {

  1660.         uf = 2.f * uf;

  1661.     }

  1662.     if (vf >= -0.5f && vf < 0.5f) {

  1663.         vf = tanf(M_PI_2 * vf);

  1664.     } else {

  1665.         vf = 2.f * vf;

  1666.     }

  1667. 

  1668.     face = u_face + 3 * v_face;

  1669. 

  1670.     switch (face) {

  1671.     case TOP_LEFT:

  1672.         l_x = -1.f;

  1673.         l_y = -vf;

  1674.         l_z = -uf;

  1675.         break;

  1676.     case TOP_MIDDLE:

  1677.         l_x =  uf;

  1678.         l_y = -vf;

  1679.         l_z = -1.f;

  1680.         break;

  1681.     case TOP_RIGHT:

  1682.         l_x =  1.f;

  1683.         l_y = -vf;

  1684.         l_z =  uf;

  1685.         break;

  1686.     case BOTTOM_LEFT:

  1687.         l_x = -vf;

  1688.         l_y = -1.f;

  1689.         l_z =  uf;

  1690.         break;

  1691.     case BOTTOM_MIDDLE:

  1692.         l_x = -vf;

  1693.         l_y =  uf;

  1694.         l_z =  1.f;

  1695.         break;

  1696.     case BOTTOM_RIGHT:

  1697.         l_x = -vf;

  1698.         l_y =  1.f;

  1699.         l_z = -uf;

  1700.         break;

  1701.     default:

  1702.         av_assert0(0);

  1703.     }

  1704. 

  1705.     vec[0] = l_x;

  1706.     vec[1] = l_y;

  1707.     vec[2] = l_z;

  1708. 

  1709.     normalize_vector(vec);

  1710. }

  1711. 

  1712. /**

  1713.  * Calculate frame position in equi-angular cubemap format for corresponding 3D coordinates on sphere.

  1714.  *

  1715.  * @param s filter context

  1716.  * @param vec coordinates on sphere

  1717.  * @param width frame width

  1718.  * @param height frame height

  1719.  * @param us horizontal coordinates for interpolation window

  1720.  * @param vs vertical coordinates for interpolation window

  1721.  * @param du horizontal relative coordinate

  1722.  * @param dv vertical relative coordinate

  1723.  */

  1724. static void xyz_to_eac(const V360Context *s,

  1725.                        const float *vec, int width, int height,

  1726.                        uint16_t us[4][4], uint16_t vs[4][4], float *du, float *dv)

  1727. {

  1728.     const float pixel_pad = 2;

  1729.     const float u_pad = pixel_pad / width;

  1730.     const float v_pad = pixel_pad / height;

  1731. 

  1732.     float uf, vf;

  1733.     int ui, vi;

  1734.     int direction, face;

  1735.     int u_face, v_face;

  1736. 

  1737.     xyz_to_cube(s, vec, &uf, &vf, &direction);

  1738. 

  1739.     face = s->in_cubemap_face_order[direction];

  1740.     u_face = face % 3;

  1741.     v_face = face / 3;

  1742. 

  1743.     uf = M_2_PI * atanf(uf) + 0.5f;

  1744.     vf = M_2_PI * atanf(vf) + 0.5f;

  1745. 

  1746.     // These formulas are inversed from eac_to_xyz ones

  1747.     uf = (uf + u_face) * (1.f - 2.f * u_pad) / 3.f + u_pad;

  1748.     vf = vf * (0.5f - 2.f * v_pad) + v_pad + 0.5f * v_face;

  1749. 

  1750.     uf *= width;

  1751.     vf *= height;

  1752. 

  1753.     ui = floorf(uf);

  1754.     vi = floorf(vf);

  1755. 

  1756.     *du = uf - ui;

  1757.     *dv = vf - vi;

  1758. 

  1759.     for (int i = -1; i < 3; i++) {

  1760.         for (int j = -1; j < 3; j++) {

  1761.             us[i + 1][j + 1] = av_clip(ui + j, 0, width  - 1);

  1762.             vs[i + 1][j + 1] = av_clip(vi + i, 0, height - 1);

  1763.         }

  1764.     }

  1765. }

  1766. 

  1767. /**

  1768.  * Prepare data for processing flat output format.

  1769.  *

  1770.  * @param ctx filter context

  1771.  *

  1772.  * @return error code

  1773.  */

  1774. static int prepare_flat_out(AVFilterContext *ctx)

  1775. {

  1776.     V360Context *s = ctx->priv;

  1777. 

  1778.     const float h_angle = 0.5f * s->h_fov * M_PI / 180.f;

  1779.     const float v_angle = 0.5f * s->v_fov * M_PI / 180.f;

  1780. 

  1781.     s->flat_range[0] =  tanf(h_angle);

  1782.     s->flat_range[1] =  tanf(v_angle);

  1783.     s->flat_range[2] = -1.f;

  1784. 

  1785.     return 0;

  1786. }

  1787. 

  1788. /**

  1789.  * Calculate 3D coordinates on sphere for corresponding frame position in flat format.

  1790.  *

  1791.  * @param s filter context

  1792.  * @param i horizontal position on frame [0, width)

  1793.  * @param j vertical position on frame [0, height)

  1794.  * @param width frame width

  1795.  * @param height frame height

  1796.  * @param vec coordinates on sphere

  1797.  */

  1798. static void flat_to_xyz(const V360Context *s,

  1799.                         int i, int j, int width, int height,

  1800.                         float *vec)

  1801. {

  1802.     const float l_x =  s->flat_range[0] * (2.f * i / width  - 1.f);

  1803.     const float l_y = -s->flat_range[1] * (2.f * j / height - 1.f);

  1804.     const float l_z =  s->flat_range[2];

  1805. 

  1806.     vec[0] = l_x;

  1807.     vec[1] = l_y;

  1808.     vec[2] = l_z;

  1809. 

  1810.     normalize_vector(vec);

  1811. }

  1812. 

  1813. /**

  1814.  * Calculate 3D coordinates on sphere for corresponding frame position in dual fisheye format.

  1815.  *

  1816.  * @param s filter context

  1817.  * @param i horizontal position on frame [0, width)

  1818.  * @param j vertical position on frame [0, height)

  1819.  * @param width frame width

  1820.  * @param height frame height

  1821.  * @param vec coordinates on sphere

  1822.  */

  1823. static void dfisheye_to_xyz(const V360Context *s,

  1824.                             int i, int j, int width, int height,

  1825.                             float *vec)

  1826. {

  1827.     const float scale = 1.f + s->out_pad;

  1828. 

  1829.     const float ew = width / 2.f;

  1830.     const float eh = height;

  1831. 

  1832.     const int ei = i >= ew ? i - ew : i;

  1833.     const float m = i >= ew ? -1.f : 1.f;

  1834. 

  1835.     const float uf = ((2.f * ei) / ew - 1.f) * scale;

  1836.     const float vf = ((2.f *  j) / eh - 1.f) * scale;

  1837. 

  1838.     const float phi   = M_PI + atan2f(vf, uf * m);

  1839.     const float theta = m * M_PI_2 * (1.f - hypotf(uf, vf));

  1840. 

  1841.     const float sin_phi   = sinf(phi);

  1842.     const float cos_phi   = cosf(phi);

  1843.     const float sin_theta = sinf(theta);

  1844.     const float cos_theta = cosf(theta);

  1845. 

  1846.     vec[0] = cos_theta * cos_phi;

  1847.     vec[1] = cos_theta * sin_phi;

  1848.     vec[2] = sin_theta;

  1849. 

  1850.     normalize_vector(vec);

  1851. }

  1852. 

  1853. /**

  1854.  * Calculate frame position in dual fisheye format for corresponding 3D coordinates on sphere.

  1855.  *

  1856.  * @param s filter context

  1857.  * @param vec coordinates on sphere

  1858.  * @param width frame width

  1859.  * @param height frame height

  1860.  * @param us horizontal coordinates for interpolation window

  1861.  * @param vs vertical coordinates for interpolation window

  1862.  * @param du horizontal relative coordinate

  1863.  * @param dv vertical relative coordinate

  1864.  */

  1865. static void xyz_to_dfisheye(const V360Context *s,

  1866.                             const float *vec, int width, int height,

  1867.                             uint16_t us[4][4], uint16_t vs[4][4], float *du, float *dv)

  1868. {

  1869.     const float scale = 1.f - s->in_pad;

  1870. 

  1871.     const float ew = width / 2.f;

  1872.     const float eh = height;

  1873. 

  1874.     const float phi   = atan2f(-vec[1], -vec[0]) * s->input_mirror_modifier[0];

  1875.     const float theta = acosf(fabsf(vec[2])) / M_PI * s->input_mirror_modifier[1];

  1876. 

  1877.     float uf = (theta * cosf(phi) * scale + 0.5f) * ew;

  1878.     float vf = (theta * sinf(phi) * scale + 0.5f) * eh;

  1879. 

  1880.     int ui, vi;

  1881.     int u_shift;

  1882. 

  1883.     if (vec[2] >= 0) {

  1884.         u_shift = 0;

  1885.     } else {

  1886.         u_shift = ceilf(ew);

  1887.         uf = ew - uf;

  1888.     }

  1889. 

  1890.     ui = floorf(uf);

  1891.     vi = floorf(vf);

  1892. 

  1893.     *du = uf - ui;

  1894.     *dv = vf - vi;

  1895. 

  1896.     for (int i = -1; i < 3; i++) {

  1897.         for (int j = -1; j < 3; j++) {

  1898.             us[i + 1][j + 1] = av_clip(u_shift + ui + j, 0, width  - 1);

  1899.             vs[i + 1][j + 1] = av_clip(          vi + i, 0, height - 1);

  1900.         }

  1901.     }

  1902. }

  1903. 

  1904. /**

  1905.  * Calculate 3D coordinates on sphere for corresponding frame position in barrel facebook's format.

  1906.  *

  1907.  * @param s filter context

  1908.  * @param i horizontal position on frame [0, width)

  1909.  * @param j vertical position on frame [0, height)

  1910.  * @param width frame width

  1911.  * @param height frame height

  1912.  * @param vec coordinates on sphere

  1913.  */

  1914. static void barrel_to_xyz(const V360Context *s,

  1915.                           int i, int j, int width, int height,

  1916.                           float *vec)

  1917. {

  1918.     const float scale = 0.99f;

  1919.     float l_x, l_y, l_z;

  1920. 

  1921.     if (i < 4 * width / 5) {

  1922.         const float theta_range = M_PI_4;

  1923. 

  1924.         const int ew = 4 * width / 5;

  1925.         const int eh = height;

  1926. 

  1927.         const float phi   = ((2.f * i) / ew - 1.f) * M_PI        / scale;

  1928.         const float theta = ((2.f * j) / eh - 1.f) * theta_range / scale;

  1929. 

  1930.         const float sin_phi   = sinf(phi);

  1931.         const float cos_phi   = cosf(phi);

  1932.         const float sin_theta = sinf(theta);

  1933.         const float cos_theta = cosf(theta);

  1934. 

  1935.         l_x =  cos_theta * sin_phi;

  1936.         l_y = -sin_theta;

  1937.         l_z = -cos_theta * cos_phi;

  1938.     } else {

  1939.         const int ew = width  / 5;

  1940.         const int eh = height / 2;

  1941. 

  1942.         float uf, vf;

  1943. 

  1944.         if (j < eh) {   // UP

  1945.             uf = 2.f * (i - 4 * ew) / ew  - 1.f;

  1946.             vf = 2.f * (j         ) / eh - 1.f;

  1947. 

  1948.             uf /= scale;

  1949.             vf /= scale;

  1950. 

  1951.             l_x =  uf;

  1952.             l_y =  1.f;

  1953.             l_z = -vf;

  1954.         } else {            // DOWN

  1955.             uf = 2.f * (i - 4 * ew) / ew - 1.f;

  1956.             vf = 2.f * (j -     eh) / eh - 1.f;

  1957. 

  1958.             uf /= scale;

  1959.             vf /= scale;

  1960. 

  1961.             l_x =  uf;

  1962.             l_y = -1.f;

  1963.             l_z =  vf;

  1964.         }

  1965.     }

  1966. 

  1967.     vec[0] = l_x;

  1968.     vec[1] = l_y;

  1969.     vec[2] = l_z;

  1970. 

  1971.     normalize_vector(vec);

  1972. }

  1973. 

  1974. /**

  1975.  * Calculate frame position in barrel facebook's format for corresponding 3D coordinates on sphere.

  1976.  *

  1977.  * @param s filter context

  1978.  * @param vec coordinates on sphere

  1979.  * @param width frame width

  1980.  * @param height frame height

  1981.  * @param us horizontal coordinates for interpolation window

  1982.  * @param vs vertical coordinates for interpolation window

  1983.  * @param du horizontal relative coordinate

  1984.  * @param dv vertical relative coordinate

  1985.  */

  1986. static void xyz_to_barrel(const V360Context *s,

  1987.                           const float *vec, int width, int height,

  1988.                           uint16_t us[4][4], uint16_t vs[4][4], float *du, float *dv)

  1989. {

  1990.     const float scale = 0.99f;

  1991. 

  1992.     const float phi   = atan2f(vec[0], -vec[2]) * s->input_mirror_modifier[0];

  1993.     const float theta = asinf(-vec[1]) * s->input_mirror_modifier[1];

  1994.     const float theta_range = M_PI_4;

  1995. 

  1996.     int ew, eh;

  1997.     int u_shift, v_shift;

  1998.     float uf, vf;

  1999.     int ui, vi;

  2000. 

  2001.     if (theta > -theta_range && theta < theta_range) {

  2002.         ew = 4 * width / 5;

  2003.         eh = height;

  2004. 

  2005.         u_shift = s->ih_flip ? width / 5 : 0;

  2006.         v_shift = 0;

  2007. 

  2008.         uf = (phi   / M_PI        * scale + 1.f) * ew / 2.f;

  2009.         vf = (theta / theta_range * scale + 1.f) * eh / 2.f;

  2010.     } else {

  2011.         ew = width  / 5;

  2012.         eh = height / 2;

  2013. 

  2014.         u_shift = s->ih_flip ? 0 : 4 * ew;

  2015. 

  2016.         if (theta < 0.f) {  // UP

  2017.             uf =  vec[0] / vec[1];

  2018.             vf = -vec[2] / vec[1];

  2019.             v_shift = 0;

  2020.         } else {            // DOWN

  2021.             uf = -vec[0] / vec[1];

  2022.             vf = -vec[2] / vec[1];

  2023.             v_shift = eh;

  2024.         }

  2025. 

  2026.         uf *= s->input_mirror_modifier[0] * s->input_mirror_modifier[1];

  2027.         vf *= s->input_mirror_modifier[1];

  2028. 

  2029.         uf = 0.5f * ew * (uf * scale + 1.f);

  2030.         vf = 0.5f * eh * (vf * scale + 1.f);

  2031.     }

  2032. 

  2033.     ui = floorf(uf);

  2034.     vi = floorf(vf);

  2035. 

  2036.     *du = uf - ui;

  2037.     *dv = vf - vi;

  2038. 

  2039.     for (int i = -1; i < 3; i++) {

  2040.         for (int j = -1; j < 3; j++) {

  2041.             us[i + 1][j + 1] = u_shift + av_clip(ui + j, 0, ew - 1);

  2042.             vs[i + 1][j + 1] = v_shift + av_clip(vi + i, 0, eh - 1);

  2043.         }

  2044.     }

  2045. }

  2046. 

  2047. static void multiply_matrix(float c[3][3], const float a[3][3], const float b[3][3])

  2048. {

  2049.     for (int i = 0; i < 3; i++) {

  2050.         for (int j = 0; j < 3; j++) {

  2051.             float sum = 0;

  2052. 

  2053.             for (int k = 0; k < 3; k++)

  2054.                 sum += a[i][k] * b[k][j];

  2055. 

  2056.             c[i][j] = sum;

  2057.         }

  2058.     }

  2059. }

  2060. 

  2061. /**

  2062.  * Calculate rotation matrix for yaw/pitch/roll angles.

  2063.  */

  2064. static inline void calculate_rotation_matrix(float yaw, float pitch, float roll,

  2065.                                              float rot_mat[3][3],

  2066.                                              const int rotation_order[3])

  2067. {

  2068.     const float yaw_rad   = yaw   * M_PI / 180.f;

  2069.     const float pitch_rad = pitch * M_PI / 180.f;

  2070.     const float roll_rad  = roll  * M_PI / 180.f;

  2071. 

  2072.     const float sin_yaw   = sinf(-yaw_rad);

  2073.     const float cos_yaw   = cosf(-yaw_rad);

  2074.     const float sin_pitch = sinf(pitch_rad);

  2075.     const float cos_pitch = cosf(pitch_rad);

  2076.     const float sin_roll  = sinf(roll_rad);

  2077.     const float cos_roll  = cosf(roll_rad);

  2078. 

  2079.     float m[3][3][3];

  2080.     float temp[3][3];

  2081. 

  2082.     m[0][0][0] =  cos_yaw;  m[0][0][1] = 0;          m[0][0][2] =  sin_yaw;

  2083.     m[0][1][0] =  0;        m[0][1][1] = 1;          m[0][1][2] =  0;

  2084.     m[0][2][0] = -sin_yaw;  m[0][2][1] = 0;          m[0][2][2] =  cos_yaw;

  2085. 

  2086.     m[1][0][0] = 1;         m[1][0][1] = 0;          m[1][0][2] =  0;

  2087.     m[1][1][0] = 0;         m[1][1][1] = cos_pitch;  m[1][1][2] = -sin_pitch;

  2088.     m[1][2][0] = 0;         m[1][2][1] = sin_pitch;  m[1][2][2] =  cos_pitch;

  2089. 

  2090.     m[2][0][0] = cos_roll;  m[2][0][1] = -sin_roll;  m[2][0][2] =  0;

  2091.     m[2][1][0] = sin_roll;  m[2][1][1] =  cos_roll;  m[2][1][2] =  0;

  2092.     m[2][2][0] = 0;         m[2][2][1] =  0;         m[2][2][2] =  1;

  2093. 

  2094.     multiply_matrix(temp, m[rotation_order[0]], m[rotation_order[1]]);

  2095.     multiply_matrix(rot_mat, temp, m[rotation_order[2]]);

  2096. }

  2097. 

  2098. /**

  2099.  * Rotate vector with given rotation matrix.

  2100.  *

  2101.  * @param rot_mat rotation matrix

  2102.  * @param vec vector

  2103.  */

  2104. static inline void rotate(const float rot_mat[3][3],

  2105.                           float *vec)

  2106. {

  2107.     const float x_tmp = vec[0] * rot_mat[0][0] + vec[1] * rot_mat[0][1] + vec[2] * rot_mat[0][2];

  2108.     const float y_tmp = vec[0] * rot_mat[1][0] + vec[1] * rot_mat[1][1] + vec[2] * rot_mat[1][2];

  2109.     const float z_tmp = vec[0] * rot_mat[2][0] + vec[1] * rot_mat[2][1] + vec[2] * rot_mat[2][2];

  2110. 

  2111.     vec[0] = x_tmp;

  2112.     vec[1] = y_tmp;

  2113.     vec[2] = z_tmp;

  2114. }

  2115. 

  2116. static inline void set_mirror_modifier(int h_flip, int v_flip, int d_flip,

  2117.                                        float *modifier)

  2118. {

  2119.     modifier[0] = h_flip ? -1.f : 1.f;

  2120.     modifier[1] = v_flip ? -1.f : 1.f;

  2121.     modifier[2] = d_flip ? -1.f : 1.f;

  2122. }

  2123. 

  2124. static inline void mirror(const float *modifier, float *vec)

  2125. {

  2126.     vec[0] *= modifier[0];

  2127.     vec[1] *= modifier[1];

  2128.     vec[2] *= modifier[2];

  2129. }

  2130. 

  2131. static int allocate_plane(V360Context *s, int sizeof_uv, int sizeof_ker, int p)

  2132. {

  2133.     s->u[p] = av_calloc(s->uv_linesize[p] * s->pr_height[p], sizeof_uv);

  2134.     s->v[p] = av_calloc(s->uv_linesize[p] * s->pr_height[p], sizeof_uv);

  2135.     if (!s->u[p] || !s->v[p])

  2136.         return AVERROR(ENOMEM);

  2137.     if (sizeof_ker) {

  2138.         s->ker[p] = av_calloc(s->uv_linesize[p] * s->pr_height[p], sizeof_ker);

  2139.         if (!s->ker[p])

  2140.             return AVERROR(ENOMEM);

  2141.     }

  2142. 

  2143.     return 0;

  2144. }

  2145. 

  2146. static void fov_from_dfov(V360Context *s, float w, float h)

  2147. {

  2148.     const float da = tanf(0.5 * FFMIN(s->d_fov, 359.f) * M_PI / 180.f);

  2149.     const float d = hypotf(w, h);

  2150. 

  2151.     s->h_fov = atan2f(da * w, d) * 360.f / M_PI;

  2152.     s->v_fov = atan2f(da * h, d) * 360.f / M_PI;

  2153. 

  2154.     if (s->h_fov < 0.f)

  2155.         s->h_fov += 360.f;

  2156.     if (s->v_fov < 0.f)

  2157.         s->v_fov += 360.f;

  2158. }

  2159. 

  2160. static void set_dimensions(int *outw, int *outh, int w, int h, const AVPixFmtDescriptor *desc)

  2161. {

  2162.     outw[1] = outw[2] = FF_CEIL_RSHIFT(w, desc->log2_chroma_w);

  2163.     outw[0] = outw[3] = w;

  2164.     outh[1] = outh[2] = FF_CEIL_RSHIFT(h, desc->log2_chroma_h);

  2165.     outh[0] = outh[3] = h;

  2166. }

  2167. 

  2168. static int config_output(AVFilterLink *outlink)

  2169. {

  2170.     AVFilterContext *ctx = outlink->src;

  2171.     AVFilterLink *inlink = ctx->inputs[0];

  2172.     V360Context *s = ctx->priv;

  2173.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);

  2174.     const int depth = desc->comp[0].depth;

  2175.     int sizeof_uv;

  2176.     int sizeof_ker;

  2177.     int elements;

  2178.     int err;

  2179.     int h, w;

  2180.     int in_offset_h, in_offset_w;

  2181.     int out_offset_h, out_offset_w;

  2182.     float hf, wf;

  2183.     float output_mirror_modifier[3];

  2184.     void (*in_transform)(const V360Context *s,

  2185.                          const float *vec, int width, int height,

  2186.                          uint16_t us[4][4], uint16_t vs[4][4], float *du, float *dv);

  2187.     void (*out_transform)(const V360Context *s,

  2188.                           int i, int j, int width, int height,

  2189.                           float *vec);

  2190.     void (*calculate_kernel)(float du, float dv, const XYRemap *r_tmp,

  2191.                              uint16_t *u, uint16_t *v, int16_t *ker);

  2192.     int (*prepare_out)(AVFilterContext *ctx);

  2193.     float rot_mat[3][3];

  2194. 

  2195.     s->input_mirror_modifier[0] = s->ih_flip ? -1.f : 1.f;

  2196.     s->input_mirror_modifier[1] = s->iv_flip ? -1.f : 1.f;

  2197. 

  2198.     switch (s->interp) {

  2199.     case NEAREST:

  2200.         calculate_kernel = nearest_kernel;

  2201.         s->remap_slice = depth <= 8 ? remap1_8bit_slice : remap1_16bit_slice;

  2202.         elements = 1;

  2203.         sizeof_uv = sizeof(uint16_t) * elements;

  2204.         sizeof_ker = 0;

  2205.         break;

  2206.     case BILINEAR:

  2207.         calculate_kernel = bilinear_kernel;

  2208.         s->remap_slice = depth <= 8 ? remap2_8bit_slice : remap2_16bit_slice;

  2209.         elements = 2 * 2;

  2210.         sizeof_uv = sizeof(uint16_t) * elements;

  2211.         sizeof_ker = sizeof(uint16_t) * elements;

  2212.         break;

  2213.     case BICUBIC:

  2214.         calculate_kernel = bicubic_kernel;

  2215.         s->remap_slice = depth <= 8 ? remap4_8bit_slice : remap4_16bit_slice;

  2216.         elements = 4 * 4;

  2217.         sizeof_uv = sizeof(uint16_t) * elements;

  2218.         sizeof_ker = sizeof(uint16_t) * elements;

  2219.         break;

  2220.     case LANCZOS:

  2221.         calculate_kernel = lanczos_kernel;

  2222.         s->remap_slice = depth <= 8 ? remap4_8bit_slice : remap4_16bit_slice;

  2223.         elements = 4 * 4;

  2224.         sizeof_uv = sizeof(uint16_t) * elements;

  2225.         sizeof_ker = sizeof(uint16_t) * elements;

  2226.         break;

  2227.     default:

  2228.         av_assert0(0);

  2229.     }

  2230. 

  2231.     ff_v360_init(s, depth);

  2232. 

  2233.     for (int order = 0; order < NB_RORDERS; order++) {

  2234.         const char c = s->rorder[order];

  2235.         int rorder;

  2236. 

  2237.         if (c == '\0') {

  2238.             av_log(ctx, AV_LOG_ERROR,

  2239.                    "Incomplete rorder option. Direction for all 3 rotation orders should be specified.\n");

  2240.             return AVERROR(EINVAL);

  2241.         }

  2242. 

  2243.         rorder = get_rorder(c);

  2244.         if (rorder == -1) {

  2245.             av_log(ctx, AV_LOG_ERROR,

  2246.                    "Incorrect rotation order symbol '%c' in rorder option.\n", c);

  2247.             return AVERROR(EINVAL);

  2248.         }

  2249. 

  2250.         s->rotation_order[order] = rorder;

  2251.     }

  2252. 

  2253.     switch (s->in_stereo) {

  2254.     case STEREO_2D:

  2255.         w = inlink->w;

  2256.         h = inlink->h;

  2257.         in_offset_w = in_offset_h = 0;

  2258.         break;

  2259.     case STEREO_SBS:

  2260.         w = inlink->w / 2;

  2261.         h = inlink->h;

  2262.         in_offset_w = w;

  2263.         in_offset_h = 0;

  2264.         break;

  2265.     case STEREO_TB:

  2266.         w = inlink->w;

  2267.         h = inlink->h / 2;

  2268.         in_offset_w = 0;

  2269.         in_offset_h = h;

  2270.         break;

  2271.     default:

  2272.         av_assert0(0);

  2273.     }

  2274. 

  2275.     set_dimensions(s->inplanewidth, s->inplaneheight, w, h, desc);

  2276.     set_dimensions(s->in_offset_w, s->in_offset_h, in_offset_w, in_offset_h, desc);

  2277. 

  2278.     switch (s->in) {

  2279.     case EQUIRECTANGULAR:

  2280.         in_transform = xyz_to_equirect;

  2281.         err = 0;

  2282.         wf = w;

  2283.         hf = h;

  2284.         break;

  2285.     case CUBEMAP_3_2:

  2286.         in_transform = xyz_to_cube3x2;

  2287.         err = prepare_cube_in(ctx);

  2288.         wf = w / 3.f * 4.f;

  2289.         hf = h;

  2290.         break;

  2291.     case CUBEMAP_1_6:

  2292.         in_transform = xyz_to_cube1x6;

  2293.         err = prepare_cube_in(ctx);

  2294.         wf = w * 4.f;

  2295.         hf = h / 3.f;

  2296.         break;

  2297.     case CUBEMAP_6_1:

  2298.         in_transform = xyz_to_cube6x1;

  2299.         err = prepare_cube_in(ctx);

  2300.         wf = w / 3.f * 2.f;

  2301.         hf = h * 2.f;

  2302.         break;

  2303.     case EQUIANGULAR:

  2304.         in_transform = xyz_to_eac;

  2305.         err = prepare_eac_in(ctx);

  2306.         wf = w;

  2307.         hf = h / 9.f * 8.f;

  2308.         break;

  2309.     case FLAT:

  2310.         av_log(ctx, AV_LOG_ERROR, "Flat format is not accepted as input.\n");

  2311.         return AVERROR(EINVAL);

  2312.     case DUAL_FISHEYE:

  2313.         in_transform = xyz_to_dfisheye;

  2314.         err = 0;

  2315.         wf = w;

  2316.         hf = h;

  2317.         break;

  2318.     case BARREL:

  2319.         in_transform = xyz_to_barrel;

  2320.         err = 0;

  2321.         wf = w / 5.f * 4.f;

  2322.         hf = h;

  2323.         break;

  2324.     case STEREOGRAPHIC:

  2325.         in_transform = xyz_to_stereographic;

  2326.         err = 0;

  2327.         wf = w;

  2328.         hf = h / 2.f;

  2329.         break;

  2330.     default:

  2331.         av_log(ctx, AV_LOG_ERROR, "Specified input format is not handled.\n");

  2332.         return AVERROR_BUG;

  2333.     }

  2334. 

  2335.     if (err != 0) {

  2336.         return err;

  2337.     }

  2338. 

  2339.     switch (s->out) {

  2340.     case EQUIRECTANGULAR:

  2341.         out_transform = equirect_to_xyz;

  2342.         prepare_out = NULL;

  2343.         w = roundf(wf);

  2344.         h = roundf(hf);

  2345.         break;

  2346.     case CUBEMAP_3_2:

  2347.         out_transform = cube3x2_to_xyz;

  2348.         prepare_out = prepare_cube_out;

  2349.         w = roundf(wf / 4.f * 3.f);

  2350.         h = roundf(hf);

  2351.         break;

  2352.     case CUBEMAP_1_6:

  2353.         out_transform = cube1x6_to_xyz;

  2354.         prepare_out = prepare_cube_out;

  2355.         w = roundf(wf / 4.f);

  2356.         h = roundf(hf * 3.f);

  2357.         break;

  2358.     case CUBEMAP_6_1:

  2359.         out_transform = cube6x1_to_xyz;

  2360.         prepare_out = prepare_cube_out;

  2361.         w = roundf(wf / 2.f * 3.f);

  2362.         h = roundf(hf / 2.f);

  2363.         break;

  2364.     case EQUIANGULAR:

  2365.         out_transform = eac_to_xyz;

  2366.         prepare_out = prepare_eac_out;

  2367.         w = roundf(wf);

  2368.         h = roundf(hf / 8.f * 9.f);

  2369.         break;

  2370.     case FLAT:

  2371.         out_transform = flat_to_xyz;

  2372.         prepare_out = prepare_flat_out;

  2373.         w = roundf(wf);

  2374.         h = roundf(hf);

  2375.         break;

  2376.     case DUAL_FISHEYE:

  2377.         out_transform = dfisheye_to_xyz;

  2378.         prepare_out = NULL;

  2379.         w = roundf(wf);

  2380.         h = roundf(hf);

  2381.         break;

  2382.     case BARREL:

  2383.         out_transform = barrel_to_xyz;

  2384.         prepare_out = NULL;

  2385.         w = roundf(wf / 4.f * 5.f);

  2386.         h = roundf(hf);

  2387.         break;

  2388.     case STEREOGRAPHIC:

  2389.         out_transform = stereographic_to_xyz;

  2390.         prepare_out = prepare_stereographic_out;

  2391.         w = roundf(wf);

  2392.         h = roundf(hf * 2.f);

  2393.         break;

  2394.     default:

  2395.         av_log(ctx, AV_LOG_ERROR, "Specified output format is not handled.\n");

  2396.         return AVERROR_BUG;

  2397.     }

  2398. 

  2399.     // Override resolution with user values if specified

  2400.     if (s->width > 0 && s->height > 0) {

  2401.         w = s->width;

  2402.         h = s->height;

  2403.     } else if (s->width > 0 || s->height > 0) {

  2404.         av_log(ctx, AV_LOG_ERROR, "Both width and height values should be specified.\n");

  2405.         return AVERROR(EINVAL);

  2406.     } else {

  2407.         if (s->out_transpose)

  2408.             FFSWAP(int, w, h);

  2409. 

  2410.         if (s->in_transpose)

  2411.             FFSWAP(int, w, h);

  2412.     }

  2413. 

  2414.     if (s->d_fov > 0.f)

  2415.         fov_from_dfov(s, w, h);

  2416. 

  2417.     if (prepare_out) {

  2418.         err = prepare_out(ctx);

  2419.         if (err != 0)

  2420.             return err;

  2421.     }

  2422. 

  2423.     set_dimensions(s->pr_width, s->pr_height, w, h, desc);

  2424. 

  2425.     switch (s->out_stereo) {

  2426.     case STEREO_2D:

  2427.         out_offset_w = out_offset_h = 0;

  2428.         break;

  2429.     case STEREO_SBS:

  2430.         out_offset_w = w;

  2431.         out_offset_h = 0;

  2432.         w *= 2;

  2433.         break;

  2434.     case STEREO_TB:

  2435.         out_offset_w = 0;

  2436.         out_offset_h = h;

  2437.         h *= 2;

  2438.         break;

  2439.     default:

  2440.         av_assert0(0);

  2441.     }

  2442. 

  2443.     set_dimensions(s->out_offset_w, s->out_offset_h, out_offset_w, out_offset_h, desc);

  2444.     set_dimensions(s->planewidth, s->planeheight, w, h, desc);

  2445. 

  2446.     for (int i = 0; i < 4; i++)

  2447.         s->uv_linesize[i] = FFALIGN(s->pr_width[i], 8);

  2448. 

  2449.     outlink->h = h;

  2450.     outlink->w = w;

  2451. 

  2452.     s->nb_planes = av_pix_fmt_count_planes(inlink->format);

  2453. 

  2454.     if (desc->log2_chroma_h == desc->log2_chroma_w && desc->log2_chroma_h == 0) {

  2455.         s->nb_allocated = 1;

  2456.         s->map[0] = s->map[1] = s->map[2] = s->map[3] = 0;

  2457.         allocate_plane(s, sizeof_uv, sizeof_ker, 0);

  2458.     } else {

  2459.         s->nb_allocated = 2;

  2460.         s->map[0] = 0;

  2461.         s->map[1] = s->map[2] = 1;

  2462.         s->map[3] = 0;

  2463.         allocate_plane(s, sizeof_uv, sizeof_ker, 0);

  2464.         allocate_plane(s, sizeof_uv, sizeof_ker, 1);

  2465.     }

  2466. 

  2467.     calculate_rotation_matrix(s->yaw, s->pitch, s->roll, rot_mat, s->rotation_order);

  2468.     set_mirror_modifier(s->h_flip, s->v_flip, s->d_flip, output_mirror_modifier);

  2469. 

  2470.     // Calculate remap data

  2471.     for (int p = 0; p < s->nb_allocated; p++) {

  2472.         const int width = s->pr_width[p];

  2473.         const int uv_linesize = s->uv_linesize[p];

  2474.         const int height = s->pr_height[p];

  2475.         const int in_width = s->inplanewidth[p];

  2476.         const int in_height = s->inplaneheight[p];

  2477.         float du, dv;

  2478.         float vec[3];

  2479.         XYRemap r_tmp;

  2480. 

  2481.         for (int i = 0; i < width; i++) {

  2482.             for (int j = 0; j < height; j++) {

  2483.                 uint16_t *u = s->u[p] + (j * uv_linesize + i) * elements;

  2484.                 uint16_t *v = s->v[p] + (j * uv_linesize + i) * elements;

  2485.                 int16_t *ker = s->ker[p] + (j * uv_linesize + i) * elements;

  2486. 

  2487.                 if (s->out_transpose)

  2488.                     out_transform(s, j, i, height, width, vec);

  2489.                 else

  2490.                     out_transform(s, i, j, width, height, vec);

  2491.                 av_assert1(!isnan(vec[0]) && !isnan(vec[1]) && !isnan(vec[2]));

  2492.                 rotate(rot_mat, vec);

  2493.                 av_assert1(!isnan(vec[0]) && !isnan(vec[1]) && !isnan(vec[2]));

  2494.                 normalize_vector(vec);

  2495.                 mirror(output_mirror_modifier, vec);

  2496.                 if (s->in_transpose)

  2497.                     in_transform(s, vec, in_height, in_width, r_tmp.v, r_tmp.u, &du, &dv);

  2498.                 else

  2499.                     in_transform(s, vec, in_width, in_height, r_tmp.u, r_tmp.v, &du, &dv);

  2500.                 av_assert1(!isnan(du) && !isnan(dv));

  2501.                 calculate_kernel(du, dv, &r_tmp, u, v, ker);

  2502.             }

  2503.         }

  2504.     }

  2505. 

  2506.     return 0;

  2507. }

  2508. 

  2509. static int filter_frame(AVFilterLink *inlink, AVFrame *in)

  2510. {

  2511.     AVFilterContext *ctx = inlink->dst;

  2512.     AVFilterLink *outlink = ctx->outputs[0];

  2513.     V360Context *s = ctx->priv;

  2514.     AVFrame *out;

  2515.     ThreadData td;

  2516. 

  2517.     out = ff_get_video_buffer(outlink, outlink->w, outlink->h);

  2518.     if (!out) {

  2519.         av_frame_free(&in);

  2520.         return AVERROR(ENOMEM);

  2521.     }

  2522.     av_frame_copy_props(out, in);

  2523. 

  2524.     td.in = in;

  2525.     td.out = out;

  2526. 

  2527.     ctx->internal->execute(ctx, s->remap_slice, &td, NULL, FFMIN(outlink->h, ff_filter_get_nb_threads(ctx)));

  2528. 

  2529.     av_frame_free(&in);

  2530.     return ff_filter_frame(outlink, out);

  2531. }

  2532. 

  2533. static av_cold void uninit(AVFilterContext *ctx)

  2534. {

  2535.     V360Context *s = ctx->priv;

  2536. 

  2537.     for (int p = 0; p < s->nb_allocated; p++) {

  2538.         av_freep(&s->u[p]);

  2539.         av_freep(&s->v[p]);

  2540.         av_freep(&s->ker[p]);

  2541.     }

  2542. }

  2543. 

  2544. static const AVFilterPad inputs[] = {

  2545.     {

  2546.         .name         = "default",

  2547.         .type         = AVMEDIA_TYPE_VIDEO,

  2548.         .filter_frame = filter_frame,

  2549.     },

  2550.     { NULL }

  2551. };

  2552. 

  2553. static const AVFilterPad outputs[] = {

  2554.     {

  2555.         .name         = "default",

  2556.         .type         = AVMEDIA_TYPE_VIDEO,

  2557.         .config_props = config_output,

  2558.     },

  2559.     { NULL }

  2560. };

  2561. 

  2562. AVFilter ff_vf_v360 = {

  2563.     .name          = "v360",

  2564.     .description   = NULL_IF_CONFIG_SMALL("Convert 360 projection of video."),

  2565.     .priv_size     = sizeof(V360Context),

  2566.     .uninit        = uninit,

  2567.     .query_formats = query_formats,

  2568.     .inputs        = inputs,

  2569.     .outputs       = outputs,

  2570.     .priv_class    = &v360_class,

  2571.     .flags         = AVFILTER_FLAG_SLICE_THREADS,

  2572. };