Libav 0.7.1
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00001 /* 00002 * Various simple utilities for ffmpeg system 00003 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard 00004 * 00005 * This file is part of Libav. 00006 * 00007 * Libav is free software; you can redistribute it and/or 00008 * modify it under the terms of the GNU Lesser General Public 00009 * License as published by the Free Software Foundation; either 00010 * version 2.1 of the License, or (at your option) any later version. 00011 * 00012 * Libav is distributed in the hope that it will be useful, 00013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00015 * Lesser General Public License for more details. 00016 * 00017 * You should have received a copy of the GNU Lesser General Public 00018 * License along with Libav; if not, write to the Free Software 00019 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00020 */ 00021 #include "avformat.h" 00022 #include "internal.h" 00023 00024 /* add one element to a dynamic array */ 00025 void ff_dynarray_add(intptr_t **tab_ptr, int *nb_ptr, intptr_t elem) 00026 { 00027 /* see similar ffmpeg.c:grow_array() */ 00028 int nb, nb_alloc; 00029 intptr_t *tab; 00030 00031 nb = *nb_ptr; 00032 tab = *tab_ptr; 00033 if ((nb & (nb - 1)) == 0) { 00034 if (nb == 0) 00035 nb_alloc = 1; 00036 else 00037 nb_alloc = nb * 2; 00038 tab = av_realloc(tab, nb_alloc * sizeof(intptr_t)); 00039 *tab_ptr = tab; 00040 } 00041 tab[nb++] = elem; 00042 *nb_ptr = nb; 00043 } 00044 00045 #define ISLEAP(y) (((y) % 4 == 0) && (((y) % 100) != 0 || ((y) % 400) == 0)) 00046 #define LEAPS_COUNT(y) ((y)/4 - (y)/100 + (y)/400) 00047 00048 /* This is our own gmtime_r. It differs from its POSIX counterpart in a 00049 couple of places, though. */ 00050 struct tm *brktimegm(time_t secs, struct tm *tm) 00051 { 00052 int days, y, ny, m; 00053 int md[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }; 00054 00055 days = secs / 86400; 00056 secs %= 86400; 00057 tm->tm_hour = secs / 3600; 00058 tm->tm_min = (secs % 3600) / 60; 00059 tm->tm_sec = secs % 60; 00060 00061 /* oh well, may be someone some day will invent a formula for this stuff */ 00062 y = 1970; /* start "guessing" */ 00063 while (days > 365) { 00064 ny = (y + days/366); 00065 days -= (ny - y) * 365 + LEAPS_COUNT(ny - 1) - LEAPS_COUNT(y - 1); 00066 y = ny; 00067 } 00068 if (days==365 && !ISLEAP(y)) { days=0; y++; } 00069 md[1] = ISLEAP(y)?29:28; 00070 for (m=0; days >= md[m]; m++) 00071 days -= md[m]; 00072 00073 tm->tm_year = y; /* unlike gmtime_r we store complete year here */ 00074 tm->tm_mon = m+1; /* unlike gmtime_r tm_mon is from 1 to 12 */ 00075 tm->tm_mday = days+1; 00076 00077 return tm; 00078 }