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134 lines
4.0 KiB
134 lines
4.0 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* |
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* ALSA sequencer Timer |
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* Copyright (c) 1998-1999 by Frank van de Pol <[email protected]> |
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*/ |
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#ifndef __SND_SEQ_TIMER_H |
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#define __SND_SEQ_TIMER_H |
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#include <sound/timer.h> |
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#include <sound/seq_kernel.h> |
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struct snd_seq_timer_tick { |
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snd_seq_tick_time_t cur_tick; /* current tick */ |
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unsigned long resolution; /* time per tick in nsec */ |
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unsigned long fraction; /* current time per tick in nsec */ |
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}; |
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struct snd_seq_timer { |
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/* ... tempo / offset / running state */ |
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unsigned int running:1, /* running state of queue */ |
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initialized:1; /* timer is initialized */ |
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unsigned int tempo; /* current tempo, us/tick */ |
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int ppq; /* time resolution, ticks/quarter */ |
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snd_seq_real_time_t cur_time; /* current time */ |
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struct snd_seq_timer_tick tick; /* current tick */ |
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int tick_updated; |
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int type; /* timer type */ |
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struct snd_timer_id alsa_id; /* ALSA's timer ID */ |
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struct snd_timer_instance *timeri; /* timer instance */ |
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unsigned int ticks; |
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unsigned long preferred_resolution; /* timer resolution, ticks/sec */ |
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unsigned int skew; |
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unsigned int skew_base; |
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struct timespec64 last_update; /* time of last clock update, used for interpolation */ |
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spinlock_t lock; |
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}; |
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/* create new timer (constructor) */ |
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struct snd_seq_timer *snd_seq_timer_new(void); |
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/* delete timer (destructor) */ |
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void snd_seq_timer_delete(struct snd_seq_timer **tmr); |
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/* */ |
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static inline void snd_seq_timer_update_tick(struct snd_seq_timer_tick *tick, |
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unsigned long resolution) |
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{ |
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if (tick->resolution > 0) { |
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tick->fraction += resolution; |
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tick->cur_tick += (unsigned int)(tick->fraction / tick->resolution); |
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tick->fraction %= tick->resolution; |
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} |
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} |
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/* compare timestamp between events */ |
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/* return 1 if a >= b; otherwise return 0 */ |
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static inline int snd_seq_compare_tick_time(snd_seq_tick_time_t *a, snd_seq_tick_time_t *b) |
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{ |
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/* compare ticks */ |
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return (*a >= *b); |
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} |
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static inline int snd_seq_compare_real_time(snd_seq_real_time_t *a, snd_seq_real_time_t *b) |
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{ |
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/* compare real time */ |
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if (a->tv_sec > b->tv_sec) |
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return 1; |
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if ((a->tv_sec == b->tv_sec) && (a->tv_nsec >= b->tv_nsec)) |
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return 1; |
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return 0; |
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} |
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static inline void snd_seq_sanity_real_time(snd_seq_real_time_t *tm) |
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{ |
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while (tm->tv_nsec >= 1000000000) { |
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/* roll-over */ |
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tm->tv_nsec -= 1000000000; |
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tm->tv_sec++; |
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} |
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} |
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/* increment timestamp */ |
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static inline void snd_seq_inc_real_time(snd_seq_real_time_t *tm, snd_seq_real_time_t *inc) |
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{ |
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tm->tv_sec += inc->tv_sec; |
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tm->tv_nsec += inc->tv_nsec; |
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snd_seq_sanity_real_time(tm); |
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} |
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static inline void snd_seq_inc_time_nsec(snd_seq_real_time_t *tm, unsigned long nsec) |
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{ |
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tm->tv_nsec += nsec; |
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snd_seq_sanity_real_time(tm); |
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} |
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/* called by timer isr */ |
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struct snd_seq_queue; |
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int snd_seq_timer_open(struct snd_seq_queue *q); |
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int snd_seq_timer_close(struct snd_seq_queue *q); |
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int snd_seq_timer_midi_open(struct snd_seq_queue *q); |
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int snd_seq_timer_midi_close(struct snd_seq_queue *q); |
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void snd_seq_timer_defaults(struct snd_seq_timer *tmr); |
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void snd_seq_timer_reset(struct snd_seq_timer *tmr); |
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int snd_seq_timer_stop(struct snd_seq_timer *tmr); |
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int snd_seq_timer_start(struct snd_seq_timer *tmr); |
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int snd_seq_timer_continue(struct snd_seq_timer *tmr); |
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int snd_seq_timer_set_tempo(struct snd_seq_timer *tmr, int tempo); |
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int snd_seq_timer_set_tempo_ppq(struct snd_seq_timer *tmr, int tempo, int ppq); |
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int snd_seq_timer_set_position_tick(struct snd_seq_timer *tmr, snd_seq_tick_time_t position); |
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int snd_seq_timer_set_position_time(struct snd_seq_timer *tmr, snd_seq_real_time_t position); |
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int snd_seq_timer_set_skew(struct snd_seq_timer *tmr, unsigned int skew, unsigned int base); |
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snd_seq_real_time_t snd_seq_timer_get_cur_time(struct snd_seq_timer *tmr, |
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bool adjust_ktime); |
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snd_seq_tick_time_t snd_seq_timer_get_cur_tick(struct snd_seq_timer *tmr); |
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extern int seq_default_timer_class; |
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extern int seq_default_timer_sclass; |
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extern int seq_default_timer_card; |
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extern int seq_default_timer_device; |
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extern int seq_default_timer_subdevice; |
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extern int seq_default_timer_resolution; |
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#endif
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