timer.h

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/*
 * libmad - MPEG audio decoder library
 * Copyright (C) 2000-2004 Underbit Technologies, Inc.
 *
 * 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
 *
 * $Id: timer.h,v 1.16 2004/01/23 09:41:33 rob Exp $
 */

# ifndef LIBMAD_TIMER_H
# define LIBMAD_TIMER_H
 
typedef struct {
  signed long seconds;      /* whole seconds */
  unsigned long fraction;   /* 1/MAD_TIMER_RESOLUTION seconds */
} mad_timer_t;
 
extern mad_timer_t const mad_timer_zero;
 
# define MAD_TIMER_RESOLUTION   352800000UL
 
enum mad_units {
  MAD_UNITS_HOURS    =    -2,
  MAD_UNITS_MINUTES  =    -1,
  MAD_UNITS_SECONDS  =     0,
 
  /* metric units */
 
  MAD_UNITS_DECISECONDS  =    10,
  MAD_UNITS_CENTISECONDS =   100,
  MAD_UNITS_MILLISECONDS =  1000,
 
  /* audio sample units */
 
  MAD_UNITS_8000_HZ  =  8000,
  MAD_UNITS_11025_HZ     = 11025,
  MAD_UNITS_12000_HZ     = 12000,
 
  MAD_UNITS_16000_HZ     = 16000,
  MAD_UNITS_22050_HZ     = 22050,
  MAD_UNITS_24000_HZ     = 24000,
 
  MAD_UNITS_32000_HZ     = 32000,
  MAD_UNITS_44100_HZ     = 44100,
  MAD_UNITS_48000_HZ     = 48000,
 
  /* video frame/field units */
 
  MAD_UNITS_24_FPS   =    24,
  MAD_UNITS_25_FPS   =    25,
  MAD_UNITS_30_FPS   =    30,
  MAD_UNITS_48_FPS   =    48,
  MAD_UNITS_50_FPS   =    50,
  MAD_UNITS_60_FPS   =    60,
 
  /* CD audio frames */
 
  MAD_UNITS_75_FPS   =    75,
 
  /* video drop-frame units */
 
  MAD_UNITS_23_976_FPS   =   -24,
  MAD_UNITS_24_975_FPS   =   -25,
  MAD_UNITS_29_97_FPS    =   -30,
  MAD_UNITS_47_952_FPS   =   -48,
  MAD_UNITS_49_95_FPS    =   -50,
  MAD_UNITS_59_94_FPS    =   -60
};
 
# define mad_timer_reset(timer) ((void) (*(timer) = mad_timer_zero))
 
int mad_timer_compare(mad_timer_t, mad_timer_t);
 
# define mad_timer_sign(timer)  mad_timer_compare((timer), mad_timer_zero)
 
void mad_timer_negate(mad_timer_t *);
mad_timer_t mad_timer_abs(mad_timer_t);
 
void mad_timer_set(mad_timer_t *, unsigned long, unsigned long, unsigned long);
void mad_timer_add(mad_timer_t *, mad_timer_t);
void mad_timer_multiply(mad_timer_t *, signed long);
 
signed long mad_timer_count(mad_timer_t, enum mad_units);
unsigned long mad_timer_fraction(mad_timer_t, unsigned long);
void mad_timer_string(mad_timer_t, char *, char const *,
              enum mad_units, enum mad_units, unsigned long);
 
# endif