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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135/* SPDX-License-Identifier: GPL-2.0-or-later *//* * ALSA sequencer Timer * Copyright (c) 1998-1999 by Frank van de Pol <fvdpol@coil.demon.nl> */#ifndef __SND_SEQ_TIMER_H#define __SND_SEQ_TIMER_H
#include <sound/timer.h>#include <sound/seq_kernel.h>
struct snd_seq_timer_tick { 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 */};
struct snd_seq_timer { /* ... 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 */ struct snd_seq_timer_tick tick; /* current tick */ int tick_updated; int type; /* timer type */ struct snd_timer_id alsa_id; /* ALSA's timer ID */ struct snd_timer_instance *timeri; /* timer instance */ unsigned int ticks; unsigned long preferred_resolution; /* timer resolution, ticks/sec */
unsigned int skew; unsigned int skew_base; unsigned int tempo_base;
struct timespec64 last_update; /* time of last clock update, used for interpolation */
spinlock_t lock;};
/* create new timer (constructor) */struct snd_seq_timer *snd_seq_timer_new(void);
/* delete timer (destructor) */void snd_seq_timer_delete(struct snd_seq_timer **tmr);
/* */static inline void snd_seq_timer_update_tick(struct snd_seq_timer_tick *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 */struct snd_seq_queue;int snd_seq_timer_open(struct snd_seq_queue *q);int snd_seq_timer_close(struct snd_seq_queue *q);void snd_seq_timer_defaults(struct snd_seq_timer *tmr);void snd_seq_timer_reset(struct snd_seq_timer *tmr);int snd_seq_timer_stop(struct snd_seq_timer *tmr);int snd_seq_timer_start(struct snd_seq_timer *tmr);int snd_seq_timer_continue(struct snd_seq_timer *tmr);int snd_seq_timer_set_tempo(struct snd_seq_timer *tmr, int tempo);int snd_seq_timer_set_tempo_ppq(struct snd_seq_timer *tmr, int tempo, int ppq, unsigned int tempo_base);int snd_seq_timer_set_position_tick(struct snd_seq_timer *tmr, snd_seq_tick_time_t position);int snd_seq_timer_set_position_time(struct snd_seq_timer *tmr, snd_seq_real_time_t position);int snd_seq_timer_set_skew(struct snd_seq_timer *tmr, unsigned int skew, unsigned int base);snd_seq_real_time_t snd_seq_timer_get_cur_time(struct snd_seq_timer *tmr, bool adjust_ktime);snd_seq_tick_time_t snd_seq_timer_get_cur_tick(struct snd_seq_timer *tmr);
extern int seq_default_timer_class;extern int seq_default_timer_sclass;extern int seq_default_timer_card;extern int seq_default_timer_device;extern int seq_default_timer_subdevice;extern int seq_default_timer_resolution;
#endif