diff options
Diffstat (limited to 'sound/core/seq/seq_timer.h')
| -rw-r--r-- | sound/core/seq/seq_timer.h | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/sound/core/seq/seq_timer.h b/sound/core/seq/seq_timer.h new file mode 100644 index 000000000000..4c0872df8931 --- /dev/null +++ b/sound/core/seq/seq_timer.h @@ -0,0 +1,141 @@ +/* + * 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); + +void snd_seq_timer_set_tick_resolution(seq_timer_tick_t *tick, int tempo, int ppq, int nticks); + +/* */ +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 |