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/* timecode.c - timecode conversion routines
* Copyright (C) 2004 Matthias Czapla <dermatsch@gmx.de>
*
* This file is part of cue2toc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#define MAXDIGITS 2
#define NUMOFNUMS 3
/* Interpret argument as timecode value ("MM:SS:FF") and return the total
number of frames. Tries to work in a way similar to atoi(), ignoring any
trailing non-timecode junk. Skips leading whitespace.
I want it to be as flexible as possible, recognizing simple values like
"0" (interpreted as "00:00:00"), "1:2" ("00:01:02") and so on.
Returns -1 on error (argument NULL or some value out of range) */
long
tc2fr(const char *tc)
{
int minutes = 0;
int seconds = 0;
int frames = 0;
long totalframes = 0;
char tmp[MAXDIGITS + 1];
int nums[NUMOFNUMS];
int n = 0;
int i = 0;
int last_was_colon = 0;
int stop = 0;
if (tc == NULL)
return -1;
for (i = 0; i <= MAXDIGITS; i++)
tmp[i] = '\0';
while (isspace(*tc))
tc++;
for (n = 0; n < NUMOFNUMS; n++) {
if (n > 0) {
if (tc[0] != ':') {
--n;
break;
} else
tc++;
}
for (i = 0; i < MAXDIGITS; i++) {
if (isdigit(tc[i])) {
tmp[i] = tc[i];
last_was_colon = 0;
} else if (tc[i] == ':') {
if (i == 0)
stop = 1;
break;
} else {
stop = 1;
break;
}
}
if (i != 0) {
tmp[i] = '\0';
nums[n] = atoi(tmp);
tc = &tc[i];
} else
--n;
if (stop)
break;
}
if (n == NUMOFNUMS)
--n;
frames = seconds = minutes = 0;
switch (n) {
case 0:
frames = nums[0];
break;
case 1:
seconds = nums[0];
frames = nums[1];
break;
case 2:
minutes = nums[0];
seconds = nums[1];
frames = nums[2];
break;
}
totalframes = ((60 * minutes) + seconds) * 75 + frames;
if (seconds > 59 || frames > 74)
return -1;
return totalframes;
}
/* Writes formatted timecode string ("MM:SS:FF") into tc, calculated from
frame number fr.
Returns -1 on error (frames value out of range) */
int
fr2tc(char *tc, long fr)
{
int m;
int s;
int f;
if (fr > 449999 || fr < 0) { /* 99:59:74 */
strcpy(tc, "00:00:00");
return -1;
}
f = fr % 75;
fr -= f;
s = (fr / 75) % 60;
fr -= s * 75;
m = fr / 75 / 60;
sprintf(tc, "%02d:%02d:%02d", m, s, f);
return 0;
}
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