1 /*
2 * Copyright (c) 2016 Vittorio Giovara <vittorio.giovara@gmail.com>
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 #include "mem.h"
22 #include "spherical.h"
23
av_spherical_alloc(size_t * size)24 AVSphericalMapping *av_spherical_alloc(size_t *size)
25 {
26 AVSphericalMapping *spherical = av_mallocz(sizeof(AVSphericalMapping));
27 if (!spherical)
28 return NULL;
29
30 if (size)
31 *size = sizeof(*spherical);
32
33 return spherical;
34 }
35
av_spherical_tile_bounds(const AVSphericalMapping * map,size_t width,size_t height,size_t * left,size_t * top,size_t * right,size_t * bottom)36 void av_spherical_tile_bounds(const AVSphericalMapping *map,
37 size_t width, size_t height,
38 size_t *left, size_t *top,
39 size_t *right, size_t *bottom)
40 {
41 /* conversion from 0.32 coordinates to pixels */
42 uint64_t orig_width = (uint64_t) width * UINT32_MAX /
43 (UINT32_MAX - map->bound_right - map->bound_left);
44 uint64_t orig_height = (uint64_t) height * UINT32_MAX /
45 (UINT32_MAX - map->bound_bottom - map->bound_top);
46
47 /* add a (UINT32_MAX - 1) to round up integer division */
48 *left = (orig_width * map->bound_left + UINT32_MAX - 1) / UINT32_MAX;
49 *top = (orig_height * map->bound_top + UINT32_MAX - 1) / UINT32_MAX;
50 *right = orig_width - width - *left;
51 *bottom = orig_height - height - *top;
52 }
53
54 static const char *spherical_projection_names[] = {
55 [AV_SPHERICAL_EQUIRECTANGULAR] = "equirectangular",
56 [AV_SPHERICAL_CUBEMAP] = "cubemap",
57 [AV_SPHERICAL_EQUIRECTANGULAR_TILE] = "tiled equirectangular",
58 };
59
av_spherical_projection_name(enum AVSphericalProjection projection)60 const char *av_spherical_projection_name(enum AVSphericalProjection projection)
61 {
62 if ((unsigned)projection >= FF_ARRAY_ELEMS(spherical_projection_names))
63 return "unknown";
64
65 return spherical_projection_names[projection];
66 }
67
av_spherical_from_name(const char * name)68 int av_spherical_from_name(const char *name)
69 {
70 int i;
71
72 for (i = 0; i < FF_ARRAY_ELEMS(spherical_projection_names); i++) {
73 size_t len = strlen(spherical_projection_names[i]);
74 if (!strncmp(spherical_projection_names[i], name, len))
75 return i;
76 }
77
78 return -1;
79 }
80