PeerStreamer

/*

 * Various simple utilities for ffmpeg system

 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard

 *

 * 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 "avformat.h"

#include "internal.h"

/* add one element to a dynamic array */

void ff_dynarray_add(intptr_t **tab_ptr, int *nb_ptr, intptr_t elem)

{

    /* see similar ffmpeg.c:grow_array() */

    int nb, nb_alloc;

    intptr_t *tab;

    nb = *nb_ptr;

    tab = *tab_ptr;

    if ((nb & (nb - 1)) == 0) {

        if (nb == 0)

            nb_alloc = 1;

        else

            nb_alloc = nb * 2;

        tab = av_realloc(tab, nb_alloc * sizeof(intptr_t));

        *tab_ptr = tab;

    }

    tab[nb++] = elem;

    *nb_ptr = nb;

}

#define ISLEAP(y) (((y) % 4 == 0) && (((y) % 100) != 0 || ((y) % 400) == 0))

#define LEAPS_COUNT(y) ((y)/4 - (y)/100 + (y)/400)

/* This is our own gmtime_r. It differs from its POSIX counterpart in a

   couple of places, though. */

struct tm *brktimegm(time_t secs, struct tm *tm)

{

    int days, y, ny, m;

    int md[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };

    days = secs / 86400;

    secs %= 86400;

    tm->tm_hour = secs / 3600;

    tm->tm_min = (secs % 3600) / 60;

    tm->tm_sec =  secs % 60;

    /* oh well, may be someone some day will invent a formula for this stuff */

    y = 1970; /* start "guessing" */

    while (days > 365) {

        ny = (y + days/366);

        days -= (ny - y) * 365 + LEAPS_COUNT(ny - 1) - LEAPS_COUNT(y - 1);

        y = ny;

    }

    if (days==365 && !ISLEAP(y)) { days=0; y++; }

    md[1] = ISLEAP(y)?29:28;

    for (m=0; days >= md[m]; m++)

         days -= md[m];

    tm->tm_year = y;  /* unlike gmtime_r we store complete year here */

    tm->tm_mon = m+1; /* unlike gmtime_r tm_mon is from 1 to 12 */

    tm->tm_mday = days+1;

    return tm;

}