From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- sound/core/seq/seq_timer.h | 134 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 134 insertions(+) create mode 100644 sound/core/seq/seq_timer.h (limited to 'sound/core/seq/seq_timer.h') diff --git a/sound/core/seq/seq_timer.h b/sound/core/seq/seq_timer.h new file mode 100644 index 000000000..4bec57df8 --- /dev/null +++ b/sound/core/seq/seq_timer.h @@ -0,0 +1,134 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * ALSA sequencer Timer + * Copyright (c) 1998-1999 by Frank van de Pol + */ +#ifndef __SND_SEQ_TIMER_H +#define __SND_SEQ_TIMER_H + +#include +#include + +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; + + 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); +int snd_seq_timer_midi_open(struct snd_seq_queue *q); +int snd_seq_timer_midi_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); +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 -- cgit v1.2.3