--- /dev/null
+/*
+ * 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>
+
+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 timeval 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_ppq(struct snd_seq_timer *tmr, 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);
+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
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