linux/sound/core/seq/seq_timer.h

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 *  ALSA sequencer Timer
 *  Copyright (c) 1998-1999 by Frank van de Pol <[email protected]>
 */
#ifndef __SND_SEQ_TIMER_H
#define __SND_SEQ_TIMER_H

#include <sound/timer.h>
#include <sound/seq_kernel.h>

struct snd_seq_timer_tick { … };

struct snd_seq_timer { … };


/* 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)
{ … }


/* 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)
{ … }

static inline int snd_seq_compare_real_time(snd_seq_real_time_t *a, snd_seq_real_time_t *b)
{ … }


static inline void snd_seq_sanity_real_time(snd_seq_real_time_t *tm)
{ … }


/* increment timestamp */
static inline void snd_seq_inc_real_time(snd_seq_real_time_t *tm, snd_seq_real_time_t *inc)
{ … }

static inline void snd_seq_inc_time_nsec(snd_seq_real_time_t *tm, unsigned long nsec)
{ … }

/* 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