2 * Various simple utilities for ffmpeg system
3 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 /* add one element to a dynamic array */
25 void ff_dynarray_add(intptr_t **tab_ptr, int *nb_ptr, intptr_t elem)
27 /* see similar ffmpeg.c:grow_array() */
33 if ((nb & (nb - 1)) == 0) {
38 tab = av_realloc(tab, nb_alloc * sizeof(intptr_t));
45 #define ISLEAP(y) (((y) % 4 == 0) && (((y) % 100) != 0 || ((y) % 400) == 0))
46 #define LEAPS_COUNT(y) ((y)/4 - (y)/100 + (y)/400)
48 /* This is our own gmtime_r. It differs from its POSIX counterpart in a
49 couple of places, though. */
50 struct tm *brktimegm(time_t secs, struct tm *tm)
53 int md[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
57 tm->tm_hour = secs / 3600;
58 tm->tm_min = (secs % 3600) / 60;
59 tm->tm_sec = secs % 60;
61 /* oh well, may be someone some day will invent a formula for this stuff */
62 y = 1970; /* start "guessing" */
65 days -= (ny - y) * 365 + LEAPS_COUNT(ny - 1) - LEAPS_COUNT(y - 1);
68 if (days==365 && !ISLEAP(y)) { days=0; y++; }
69 md[1] = ISLEAP(y)?29:28;
70 for (m=0; days >= md[m]; m++)
73 tm->tm_year = y; /* unlike gmtime_r we store complete year here */
74 tm->tm_mon = m+1; /* unlike gmtime_r tm_mon is from 1 to 12 */