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1da177e4 LT |
1 | /* |
2 | * ALSA sequencer Timer | |
3 | * Copyright (c) 1998-1999 by Frank van de Pol <fvdpol@coil.demon.nl> | |
4 | * | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
19 | * | |
20 | */ | |
21 | #ifndef __SND_SEQ_TIMER_H | |
22 | #define __SND_SEQ_TIMER_H | |
23 | ||
24 | #include <sound/timer.h> | |
25 | #include <sound/seq_kernel.h> | |
26 | ||
c7e0b5bf | 27 | struct snd_seq_timer_tick { |
1da177e4 LT |
28 | snd_seq_tick_time_t cur_tick; /* current tick */ |
29 | unsigned long resolution; /* time per tick in nsec */ | |
30 | unsigned long fraction; /* current time per tick in nsec */ | |
c7e0b5bf | 31 | }; |
1da177e4 | 32 | |
c7e0b5bf | 33 | struct snd_seq_timer { |
1da177e4 LT |
34 | /* ... tempo / offset / running state */ |
35 | ||
36 | unsigned int running:1, /* running state of queue */ | |
37 | initialized:1; /* timer is initialized */ | |
38 | ||
39 | unsigned int tempo; /* current tempo, us/tick */ | |
40 | int ppq; /* time resolution, ticks/quarter */ | |
41 | ||
42 | snd_seq_real_time_t cur_time; /* current time */ | |
c7e0b5bf | 43 | struct snd_seq_timer_tick tick; /* current tick */ |
1da177e4 LT |
44 | int tick_updated; |
45 | ||
46 | int type; /* timer type */ | |
c7e0b5bf TI |
47 | struct snd_timer_id alsa_id; /* ALSA's timer ID */ |
48 | struct snd_timer_instance *timeri; /* timer instance */ | |
1da177e4 LT |
49 | unsigned int ticks; |
50 | unsigned long preferred_resolution; /* timer resolution, ticks/sec */ | |
51 | ||
52 | unsigned int skew; | |
53 | unsigned int skew_base; | |
54 | ||
3915bf29 | 55 | struct timespec64 last_update; /* time of last clock update, used for interpolation */ |
1da177e4 LT |
56 | |
57 | spinlock_t lock; | |
c7e0b5bf | 58 | }; |
1da177e4 LT |
59 | |
60 | ||
61 | /* create new timer (constructor) */ | |
c7e0b5bf | 62 | struct snd_seq_timer *snd_seq_timer_new(void); |
1da177e4 LT |
63 | |
64 | /* delete timer (destructor) */ | |
c7e0b5bf | 65 | void snd_seq_timer_delete(struct snd_seq_timer **tmr); |
1da177e4 | 66 | |
1da177e4 | 67 | /* */ |
c7e0b5bf TI |
68 | static inline void snd_seq_timer_update_tick(struct snd_seq_timer_tick *tick, |
69 | unsigned long resolution) | |
1da177e4 LT |
70 | { |
71 | if (tick->resolution > 0) { | |
72 | tick->fraction += resolution; | |
73 | tick->cur_tick += (unsigned int)(tick->fraction / tick->resolution); | |
74 | tick->fraction %= tick->resolution; | |
75 | } | |
76 | } | |
77 | ||
78 | ||
79 | /* compare timestamp between events */ | |
80 | /* return 1 if a >= b; otherwise return 0 */ | |
81 | static inline int snd_seq_compare_tick_time(snd_seq_tick_time_t *a, snd_seq_tick_time_t *b) | |
82 | { | |
83 | /* compare ticks */ | |
84 | return (*a >= *b); | |
85 | } | |
86 | ||
87 | static inline int snd_seq_compare_real_time(snd_seq_real_time_t *a, snd_seq_real_time_t *b) | |
88 | { | |
89 | /* compare real time */ | |
90 | if (a->tv_sec > b->tv_sec) | |
91 | return 1; | |
92 | if ((a->tv_sec == b->tv_sec) && (a->tv_nsec >= b->tv_nsec)) | |
93 | return 1; | |
94 | return 0; | |
95 | } | |
96 | ||
97 | ||
98 | static inline void snd_seq_sanity_real_time(snd_seq_real_time_t *tm) | |
99 | { | |
100 | while (tm->tv_nsec >= 1000000000) { | |
101 | /* roll-over */ | |
102 | tm->tv_nsec -= 1000000000; | |
103 | tm->tv_sec++; | |
104 | } | |
105 | } | |
106 | ||
107 | ||
108 | /* increment timestamp */ | |
109 | static inline void snd_seq_inc_real_time(snd_seq_real_time_t *tm, snd_seq_real_time_t *inc) | |
110 | { | |
111 | tm->tv_sec += inc->tv_sec; | |
112 | tm->tv_nsec += inc->tv_nsec; | |
113 | snd_seq_sanity_real_time(tm); | |
114 | } | |
115 | ||
116 | static inline void snd_seq_inc_time_nsec(snd_seq_real_time_t *tm, unsigned long nsec) | |
117 | { | |
118 | tm->tv_nsec += nsec; | |
119 | snd_seq_sanity_real_time(tm); | |
120 | } | |
121 | ||
122 | /* called by timer isr */ | |
c7e0b5bf TI |
123 | struct snd_seq_queue; |
124 | int snd_seq_timer_open(struct snd_seq_queue *q); | |
125 | int snd_seq_timer_close(struct snd_seq_queue *q); | |
126 | int snd_seq_timer_midi_open(struct snd_seq_queue *q); | |
127 | int snd_seq_timer_midi_close(struct snd_seq_queue *q); | |
128 | void snd_seq_timer_defaults(struct snd_seq_timer *tmr); | |
129 | void snd_seq_timer_reset(struct snd_seq_timer *tmr); | |
130 | int snd_seq_timer_stop(struct snd_seq_timer *tmr); | |
131 | int snd_seq_timer_start(struct snd_seq_timer *tmr); | |
132 | int snd_seq_timer_continue(struct snd_seq_timer *tmr); | |
133 | int snd_seq_timer_set_tempo(struct snd_seq_timer *tmr, int tempo); | |
134 | int snd_seq_timer_set_ppq(struct snd_seq_timer *tmr, int ppq); | |
135 | int snd_seq_timer_set_position_tick(struct snd_seq_timer *tmr, snd_seq_tick_time_t position); | |
136 | int snd_seq_timer_set_position_time(struct snd_seq_timer *tmr, snd_seq_real_time_t position); | |
137 | int snd_seq_timer_set_skew(struct snd_seq_timer *tmr, unsigned int skew, unsigned int base); | |
138 | snd_seq_real_time_t snd_seq_timer_get_cur_time(struct snd_seq_timer *tmr); | |
139 | snd_seq_tick_time_t snd_seq_timer_get_cur_tick(struct snd_seq_timer *tmr); | |
1da177e4 | 140 | |
3b378e1f MŚ |
141 | extern int seq_default_timer_class; |
142 | extern int seq_default_timer_sclass; | |
143 | extern int seq_default_timer_card; | |
144 | extern int seq_default_timer_device; | |
145 | extern int seq_default_timer_subdevice; | |
146 | extern int seq_default_timer_resolution; | |
147 | ||
1da177e4 | 148 | #endif |