summaryrefslogtreecommitdiffstats
path: root/sound/core/seq/seq_timer.h
blob: 287ed68591dee872f11eeb7cf421a45793f02564 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
/*
 *  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>

typedef struct {
	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 */
} seq_timer_tick_t;

typedef struct {
	/* ... 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 */
	seq_timer_tick_t	tick;		/* current tick */
	int tick_updated;
	
	int			type;		/* timer type */
	snd_timer_id_t		alsa_id;	/* ALSA's timer ID */
	snd_timer_instance_t	*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;
} seq_timer_t;


/* create new timer (constructor) */
extern seq_timer_t *snd_seq_timer_new(void);

/* delete timer (destructor) */
extern void snd_seq_timer_delete(seq_timer_t **tmr);

/* */
static inline void snd_seq_timer_update_tick(seq_timer_tick_t *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 */
int snd_seq_timer_open(queue_t *q);
int snd_seq_timer_close(queue_t *q);
int snd_seq_timer_midi_open(queue_t *q);
int snd_seq_timer_midi_close(queue_t *q);
void snd_seq_timer_defaults(seq_timer_t *tmr);
void snd_seq_timer_reset(seq_timer_t *tmr);
int snd_seq_timer_stop(seq_timer_t *tmr);
int snd_seq_timer_start(seq_timer_t *tmr);
int snd_seq_timer_continue(seq_timer_t *tmr);
int snd_seq_timer_set_tempo(seq_timer_t *tmr, int tempo);
int snd_seq_timer_set_ppq(seq_timer_t *tmr, int ppq);
int snd_seq_timer_set_position_tick(seq_timer_t *tmr, snd_seq_tick_time_t position);
int snd_seq_timer_set_position_time(seq_timer_t *tmr, snd_seq_real_time_t position);
int snd_seq_timer_set_skew(seq_timer_t *tmr, unsigned int skew, unsigned int base);
snd_seq_real_time_t snd_seq_timer_get_cur_time(seq_timer_t *tmr);
snd_seq_tick_time_t snd_seq_timer_get_cur_tick(seq_timer_t *tmr);

#endif