| /* |
| * 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 |