blob: 4be55f36cff994548977fd4c212ddb7039d95547
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| 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 |