/* * Copyright (c) 2016 Vittorio Giovara <vittorio.giovara@gmail.com> * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "avstring.h" #include "macros.h" #include "mem.h" #include "spherical.h" AVSphericalMapping *av_spherical_alloc(size_t *size) { AVSphericalMapping *spherical = av_mallocz(sizeof(AVSphericalMapping)); if (!spherical) return NULL; spherical->projection = AV_SPHERICAL_RECTILINEAR; if (size) *size = sizeof(*spherical); return spherical; } void 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) { /* conversion from 0.32 coordinates to pixels */ uint64_t orig_width = (uint64_t) width * UINT32_MAX / (UINT32_MAX - map->bound_right - map->bound_left); uint64_t orig_height = (uint64_t) height * UINT32_MAX / (UINT32_MAX - map->bound_bottom - map->bound_top); /* add a (UINT32_MAX - 1) to round up integer division */ *left = (orig_width * map->bound_left + UINT32_MAX - 1) / UINT32_MAX; *top = (orig_height * map->bound_top + UINT32_MAX - 1) / UINT32_MAX; *right = orig_width - width - *left; *bottom = orig_height - height - *top; } static const char *const spherical_projection_names[] = { [AV_SPHERICAL_EQUIRECTANGULAR] = "equirectangular", [AV_SPHERICAL_CUBEMAP] = "cubemap", [AV_SPHERICAL_EQUIRECTANGULAR_TILE] = "tiled equirectangular", [AV_SPHERICAL_HALF_EQUIRECTANGULAR] = "half equirectangular", [AV_SPHERICAL_RECTILINEAR] = "rectilinear", [AV_SPHERICAL_FISHEYE] = "fisheye", }; const char *av_spherical_projection_name(enum AVSphericalProjection projection) { if ((unsigned)projection >= FF_ARRAY_ELEMS(spherical_projection_names)) return "unknown"; return spherical_projection_names[projection]; } int av_spherical_from_name(const char *name) { int i; for (i = 0; i < FF_ARRAY_ELEMS(spherical_projection_names); i++) { if (av_strstart(name, spherical_projection_names[i], NULL)) return i; } return -1; }