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