149 lines
4.6 KiB
C
149 lines
4.6 KiB
C
/*
|
|
* ALSA sequencer Timer
|
|
* Copyright (c) 1998-1999 by Frank van de Pol <fvdpol@coil.demon.nl>
|
|
*
|
|
*
|
|
* 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
|
|
*
|
|
*/
|
|
#ifndef __SND_SEQ_TIMER_H
|
|
#define __SND_SEQ_TIMER_H
|
|
|
|
#include <sound/timer.h>
|
|
#include <sound/seq_kernel.h>
|
|
|
|
struct snd_seq_timer_tick {
|
|
snd_seq_tick_time_t cur_tick; /* current tick */
|
|
unsigned long resolution; /* time per tick in nsec */
|
|
unsigned long fraction; /* current time per tick in nsec */
|
|
};
|
|
|
|
struct snd_seq_timer {
|
|
/* ... tempo / offset / running state */
|
|
|
|
unsigned int running:1, /* running state of queue */
|
|
initialized:1; /* timer is initialized */
|
|
|
|
unsigned int tempo; /* current tempo, us/tick */
|
|
int ppq; /* time resolution, ticks/quarter */
|
|
|
|
snd_seq_real_time_t cur_time; /* current time */
|
|
struct snd_seq_timer_tick tick; /* current tick */
|
|
int tick_updated;
|
|
|
|
int type; /* timer type */
|
|
struct snd_timer_id alsa_id; /* ALSA's timer ID */
|
|
struct snd_timer_instance *timeri; /* timer instance */
|
|
unsigned int ticks;
|
|
unsigned long preferred_resolution; /* timer resolution, ticks/sec */
|
|
|
|
unsigned int skew;
|
|
unsigned int skew_base;
|
|
|
|
struct timeval last_update; /* time of last clock update, used for interpolation */
|
|
|
|
spinlock_t lock;
|
|
};
|
|
|
|
|
|
/* create new timer (constructor) */
|
|
struct snd_seq_timer *snd_seq_timer_new(void);
|
|
|
|
/* delete timer (destructor) */
|
|
void snd_seq_timer_delete(struct snd_seq_timer **tmr);
|
|
|
|
/* */
|
|
static inline void snd_seq_timer_update_tick(struct snd_seq_timer_tick *tick,
|
|
unsigned long resolution)
|
|
{
|
|
if (tick->resolution > 0) {
|
|
tick->fraction += resolution;
|
|
tick->cur_tick += (unsigned int)(tick->fraction / tick->resolution);
|
|
tick->fraction %= tick->resolution;
|
|
}
|
|
}
|
|
|
|
|
|
/* compare timestamp between events */
|
|
/* return 1 if a >= b; otherwise return 0 */
|
|
static inline int snd_seq_compare_tick_time(snd_seq_tick_time_t *a, snd_seq_tick_time_t *b)
|
|
{
|
|
/* compare ticks */
|
|
return (*a >= *b);
|
|
}
|
|
|
|
static inline int snd_seq_compare_real_time(snd_seq_real_time_t *a, snd_seq_real_time_t *b)
|
|
{
|
|
/* compare real time */
|
|
if (a->tv_sec > b->tv_sec)
|
|
return 1;
|
|
if ((a->tv_sec == b->tv_sec) && (a->tv_nsec >= b->tv_nsec))
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
|
|
static inline void snd_seq_sanity_real_time(snd_seq_real_time_t *tm)
|
|
{
|
|
while (tm->tv_nsec >= 1000000000) {
|
|
/* roll-over */
|
|
tm->tv_nsec -= 1000000000;
|
|
tm->tv_sec++;
|
|
}
|
|
}
|
|
|
|
|
|
/* increment timestamp */
|
|
static inline void snd_seq_inc_real_time(snd_seq_real_time_t *tm, snd_seq_real_time_t *inc)
|
|
{
|
|
tm->tv_sec += inc->tv_sec;
|
|
tm->tv_nsec += inc->tv_nsec;
|
|
snd_seq_sanity_real_time(tm);
|
|
}
|
|
|
|
static inline void snd_seq_inc_time_nsec(snd_seq_real_time_t *tm, unsigned long nsec)
|
|
{
|
|
tm->tv_nsec += nsec;
|
|
snd_seq_sanity_real_time(tm);
|
|
}
|
|
|
|
/* called by timer isr */
|
|
struct snd_seq_queue;
|
|
int snd_seq_timer_open(struct snd_seq_queue *q);
|
|
int snd_seq_timer_close(struct snd_seq_queue *q);
|
|
int snd_seq_timer_midi_open(struct snd_seq_queue *q);
|
|
int snd_seq_timer_midi_close(struct snd_seq_queue *q);
|
|
void snd_seq_timer_defaults(struct snd_seq_timer *tmr);
|
|
void snd_seq_timer_reset(struct snd_seq_timer *tmr);
|
|
int snd_seq_timer_stop(struct snd_seq_timer *tmr);
|
|
int snd_seq_timer_start(struct snd_seq_timer *tmr);
|
|
int snd_seq_timer_continue(struct snd_seq_timer *tmr);
|
|
int snd_seq_timer_set_tempo(struct snd_seq_timer *tmr, int tempo);
|
|
int snd_seq_timer_set_ppq(struct snd_seq_timer *tmr, int ppq);
|
|
int snd_seq_timer_set_position_tick(struct snd_seq_timer *tmr, snd_seq_tick_time_t position);
|
|
int snd_seq_timer_set_position_time(struct snd_seq_timer *tmr, snd_seq_real_time_t position);
|
|
int snd_seq_timer_set_skew(struct snd_seq_timer *tmr, unsigned int skew, unsigned int base);
|
|
snd_seq_real_time_t snd_seq_timer_get_cur_time(struct snd_seq_timer *tmr);
|
|
snd_seq_tick_time_t snd_seq_timer_get_cur_tick(struct snd_seq_timer *tmr);
|
|
|
|
extern int seq_default_timer_class;
|
|
extern int seq_default_timer_sclass;
|
|
extern int seq_default_timer_card;
|
|
extern int seq_default_timer_device;
|
|
extern int seq_default_timer_subdevice;
|
|
extern int seq_default_timer_resolution;
|
|
|
|
#endif
|