/*

 * time.c -- time functions

 *

 * Copyright (C) 2004, 2005, 2006, 2007 Svend Sorensen

 * For license terms, see the file COPYING in this distribution.

 */

#include "time.h"

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

long time_msf_to_frame(int m, int s, int f)

{

  if (m < 0 || m > 99 || s < 0 || s >= 60 || f < 0 || f >= 75) {

    return -1;

  }

  return (m * 60 + s) * 75 + f;

}

void time_frame_to_msf(long frame, int *m, int *s, int *f)

{

  *f = frame % 75;           /* 0 <= frames <= 74 */

  frame /= 75;

  *s = frame % 60;          /* 0 <= seconds <= 59 */

  frame /= 60;

  *m = frame;               /* 0 <= minutes */

}

/* print frame in mm:ss:ff format */

char *time_frame_to_mmssff(long f)

{

  static char msf[9];

  int minutes, seconds, frames;

  if (f < 0 || f >= 75 * 60 * 100) {

    strcpy(msf, "00:00:00");

    return msf;

  }

  time_frame_to_msf(f, &minutes, &seconds, &frames);

  snprintf(msf, sizeof(msf), "%02d:%02d:%02d", minutes, seconds, frames);

  return msf;

}