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/*
* ALSA sequencer Timer
* Copyright (c) 1998 by Frank van de Pol <F.K.W.van.de.Pol@inter.nl.net>
*
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include "driver.h"
#include "seq_timer.h"
#include "seq_queue.h"
#include "seq_info.h"
/* static data */
static snd_seq_real_time_t timer_period;
static void snd_seq_timer_reset(timer_t * tmr);
/* create new timer (constructor) */
timer_t *snd_seq_timer_new(void)
{
timer_t *tmr;
tmr = snd_malloc(sizeof(timer_t));
if (tmr == NULL) {
snd_printk("malloc failed for snd_seq_timer_new() \n");
return NULL;
}
/* clear unused variables */
memset(tmr, 0, sizeof(timer_t));
/* setup defaults */
tmr->ppq = 96; /* 96 PPQ */
tmr->tempo = 500000; /* 120 BPM */
tmr->running = 0;
/* reset time */
snd_seq_timer_reset(tmr);
return tmr;
}
/* delete timer (destructor) */
void snd_seq_timer_delete(timer_t **tmr)
{
timer_t *t = *tmr;
*tmr = NULL;
if (t == NULL) {
snd_printk("oops: snd_seq_timer_delete() called with NULL timer\n");
return;
}
t->running = 0;
/* reset time */
snd_seq_timer_reset(t);
snd_free(t,sizeof(timer_t));
}
static void snd_seq_timer_reset(timer_t * tmr)
{
/* reset time & songposition */
tmr->cur_tick = 0;
tmr->cur_time.tv_sec = 0;
tmr->cur_time.tv_nsec = 0;
tmr->tempo_tick = 0;
tmr->tempo_time.tv_sec = 0;
tmr->tempo_time.tv_nsec = 0;
tmr->sync_tmp = 0;
}
/* called by timer interrupt routine. the period time since previous invocation is passed */
int snd_seq_timer_interrupt(snd_seq_real_time_t * period)
{
volatile int timers_running = 0; /* flag if we did increment times */
int c;
queue_t *q;
timer_t *tmr;
/* FIXME: temporary hack to get timer resolution, should be set by registration call (together with name) */
memcpy(&timer_period, period, sizeof(snd_seq_real_time_t));
/* process all timers... */
for (c = 0; c < SND_SEQ_MAX_QUEUES; c++) {
q = queueptr(c);
if (q == NULL)
continue;
tmr = q->timer;
if (tmr != NULL) {
if (tmr->running) {
double delta_time;
/* update timer */
snd_seq_inc_real_time(&tmr->cur_time, period);
timers_running = 1;
/* calculate current tick */
/* FIXME: use of floating point stuff, illegal in kernel (??) */
if (tmr->tempo > 0) {
delta_time = tmr->cur_time.tv_sec - tmr->tempo_time.tv_sec + (1.0E-9 * (double) (tmr->cur_time.tv_nsec - tmr->tempo_time.tv_nsec));
tmr->cur_tick = tmr->tempo_tick + (tmr->ppq * delta_time * 1.0E6 / tmr->tempo);
}
}
}
}
if (timers_running) {
#ifdef 0
/* sync timer has expired *//* FIXME: hack to send midi sync info */
if ((tmr->cur_tick > tmr->sync_tmp) && (snd_seq_unused_cells() > 10)) {
snd_seq_event_t ev;
ev.type = SND_SEQ_EVENT_CLOCK;
ev.flags = SND_SEQ_TIME_STAMP_TICK | SND_SEQ_TIME_MODE_ABS;
ev.time.tick = 0;
ev.source.queue = 0;
ev.source.client = 0;
ev.source.port = 0;
ev.dest.queue = 1;
ev.dest.client = 255;
ev.dest.port = 255;
if (snd_seq_kernel_client_dispatch(0, &ev)) {
tmr->sync_tmp += tmr->ppq / 24;
}
}
#endif
/* check queues and dispatch events */
snd_seq_check_queues();
}
return 0; /* FIXME ??? perhaps return the timers_running flag, so the timer can decrease frequency if there are no active queues */
}
void snd_seq_timer_set_tempo(timer_t * tmr, int tempo)
{
if (tmr) {
/* store location of tempo chamge */
tmr->tempo_tick = tmr->cur_tick;
tmr->tempo_time.tv_sec = tmr->cur_time.tv_sec;
tmr->tempo_time.tv_nsec = tmr->cur_time.tv_nsec;
tmr->tempo = tempo;
}
}
void snd_seq_timer_set_ppq(timer_t * tmr, int ppq)
{
if (tmr) {
if (tmr->running & (ppq != tmr->ppq)) {
/* refuse to change ppq on running timers, because it wil upset the song position (ticks) */
snd_printk("seq: cannot change ppq of a running timer\n");
} else {
tmr->ppq = ppq;
}
}
}
void snd_seq_timer_stop(timer_t * tmr)
{
tmr->running = 0;
}
void snd_seq_timer_start(timer_t * tmr)
{
tmr->running = 1;
/* reset time & songposition */
snd_seq_timer_reset(tmr);
}
void snd_seq_timer_continue(timer_t * tmr)
{
tmr->running = 1;
}
/* exported to seq_info.c */
void snd_seq_info_timer_read(snd_info_buffer_t * buffer, void *private_data)
{
snd_iprintf(buffer, "Timer : %s\n", "Some unknown Timer...");
snd_iprintf(buffer, "Period time : %d.%09d\n", timer_period.tv_sec, timer_period.tv_nsec);
}
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