mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-18 03:19:31 +02:00
9033e8723c
Reviewed-by: Benoit Fouet <benoit.fouet@free.fr> Reviewed-by: Vittorio Giovara <vittorio.giovara@gmail.com> Signed-off-by: James Almer <jamrial@gmail.com>
80 lines
2.7 KiB
C
80 lines
2.7 KiB
C
/*
|
|
* 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 "mem.h"
|
|
#include "spherical.h"
|
|
|
|
AVSphericalMapping *av_spherical_alloc(size_t *size)
|
|
{
|
|
AVSphericalMapping *spherical = av_mallocz(sizeof(AVSphericalMapping));
|
|
if (!spherical)
|
|
return NULL;
|
|
|
|
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 *spherical_projection_names[] = {
|
|
[AV_SPHERICAL_EQUIRECTANGULAR] = "equirectangular",
|
|
[AV_SPHERICAL_CUBEMAP] = "cubemap",
|
|
[AV_SPHERICAL_EQUIRECTANGULAR_TILE] = "tiled equirectangular",
|
|
};
|
|
|
|
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++) {
|
|
size_t len = strlen(spherical_projection_names[i]);
|
|
if (!strncmp(spherical_projection_names[i], name, len))
|
|
return i;
|
|
}
|
|
|
|
return -1;
|
|
}
|