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 time_t mktimegm(struct tm *tm)
49 int y = tm->tm_year + 1900, m = tm->tm_mon + 1, d = tm->tm_mday;
57 (d + (153 * m - 457) / 5 + 365 * y + y / 4 - y / 100 + y / 400 - 719469);
59 t += 3600 * tm->tm_hour + 60 * tm->tm_min + tm->tm_sec;
64 #define ISLEAP(y) (((y) % 4 == 0) && (((y) % 100) != 0 || ((y) % 400) == 0))
65 #define LEAPS_COUNT(y) ((y)/4 - (y)/100 + (y)/400)
67 /* This is our own gmtime_r. It differs from its POSIX counterpart in a
68 couple of places, though. */
69 struct tm *brktimegm(time_t secs, struct tm *tm)
72 int md[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
76 tm->tm_hour = secs / 3600;
77 tm->tm_min = (secs % 3600) / 60;
78 tm->tm_sec = secs % 60;
80 /* oh well, may be someone some day will invent a formula for this stuff */
81 y = 1970; /* start "guessing" */
84 days -= (ny - y) * 365 + LEAPS_COUNT(ny - 1) - LEAPS_COUNT(y - 1);
87 if (days==365 && !ISLEAP(y)) { days=0; y++; }
88 md[1] = ISLEAP(y)?29:28;
89 for (m=0; days >= md[m]; m++)
92 tm->tm_year = y; /* unlike gmtime_r we store complete year here */
93 tm->tm_mon = m+1; /* unlike gmtime_r tm_mon is from 1 to 12 */
99 /* get a positive number between n_min and n_max, for a maximum length
100 of len_max. Return -1 if error. */
101 static int date_get_num(const char **pp,
102 int n_min, int n_max, int len_max)
109 for(i = 0; i < len_max; i++) {
113 val = (val * 10) + c - '0';
116 /* no number read ? */
119 if (val < n_min || val > n_max)
125 /* small strptime for ffmpeg */
126 const char *small_strptime(const char *p, const char *fmt,
135 } else if (c == '%') {
139 val = date_get_num(&p, 0, 23, 2);
145 val = date_get_num(&p, 0, 59, 2);
151 val = date_get_num(&p, 0, 59, 2);
157 val = date_get_num(&p, 0, 9999, 4);
160 dt->tm_year = val - 1900;
163 val = date_get_num(&p, 1, 12, 2);
166 dt->tm_mon = val - 1;
169 val = date_get_num(&p, 1, 31, 2);