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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 17:32:43 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 17:32:43 +0000 |
commit | 6bf0a5cb5034a7e684dcc3500e841785237ce2dd (patch) | |
tree | a68f146d7fa01f0134297619fbe7e33db084e0aa /media/ffvpx/libavutil/dynarray.h | |
parent | Initial commit. (diff) | |
download | thunderbird-6bf0a5cb5034a7e684dcc3500e841785237ce2dd.tar.xz thunderbird-6bf0a5cb5034a7e684dcc3500e841785237ce2dd.zip |
Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'media/ffvpx/libavutil/dynarray.h')
-rw-r--r-- | media/ffvpx/libavutil/dynarray.h | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/media/ffvpx/libavutil/dynarray.h b/media/ffvpx/libavutil/dynarray.h new file mode 100644 index 0000000000..3a7e146422 --- /dev/null +++ b/media/ffvpx/libavutil/dynarray.h @@ -0,0 +1,70 @@ +/* + * 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 + */ + +#ifndef AVUTIL_DYNARRAY_H +#define AVUTIL_DYNARRAY_H + +#include "log.h" +#include "mem.h" + +/** + * Add an element to a dynamic array. + * + * The array is reallocated when its number of elements reaches powers of 2. + * Therefore, the amortized cost of adding an element is constant. + * + * In case of success, the pointer to the array is updated in order to + * point to the new grown array, and the size is incremented. + * + * @param av_size_max maximum size of the array, usually the MAX macro of + * the type of the size + * @param av_elt_size size of the elements in the array, in bytes + * @param av_array pointer to the array, must be a lvalue + * @param av_size size of the array, must be an integer lvalue + * @param av_success statement to execute on success; at this point, the + * size variable is not yet incremented + * @param av_failure statement to execute on failure; if this happens, the + * array and size are not changed; the statement can end + * with a return or a goto + */ +#define FF_DYNARRAY_ADD(av_size_max, av_elt_size, av_array, av_size, \ + av_success, av_failure) \ + do { \ + size_t av_size_new = (av_size); \ + if (!((av_size) & ((av_size) - 1))) { \ + av_size_new = (av_size) ? (av_size) << 1 : 1; \ + if (av_size_new > (av_size_max) / (av_elt_size)) { \ + av_size_new = 0; \ + } else { \ + void *av_array_new = \ + av_realloc((av_array), av_size_new * (av_elt_size)); \ + if (!av_array_new) \ + av_size_new = 0; \ + else \ + (av_array) = av_array_new; \ + } \ + } \ + if (av_size_new) { \ + { av_success } \ + (av_size)++; \ + } else { \ + av_failure \ + } \ + } while (0) + +#endif /* AVUTIL_DYNARRAY_H */ |