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/*
* Test for ALSA sequencer, show current time
* 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.
*
*/
/* simple client that displays the sequencer's current time */
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include <curses.h>
#include <string.h>
#include "seq.h"
int seqfd; /* file descriptor for ALSA sequencer */
/* write event to ALSA sequencer */
void write_ev(snd_seq_event_t * ev)
{
int written;
ev->flags &= ~SND_SEQ_EVENT_LENGTH_MASK;
ev->flags |= SND_SEQ_EVENT_LENGTH_FIXED;
written = 0;
while (!written) {
written = write(seqfd, ev, sizeof(*ev));
if (!written)
usleep(0.05E6);
}
}
void main(void)
{
char *name;
int myid;
snd_seq_client_info_t inf;
snd_seq_queue_info_t queue_info;
int keypress;
int queue = 1;
seqfd = open("/dev/sndseq", O_RDWR);
if (ioctl(seqfd, SND_SEQ_IOCTL_CLIENT_ID, &myid) < 0) {
perror("ioctl");
exit(1);
}
printf("My client id = %d\n", myid);
/* set name */
memset(&inf, 0, sizeof(snd_seq_client_info_t));
strcpy(inf.name, "Time Display");
if (ioctl(seqfd, SND_SEQ_IOCTL_SET_CLIENT_INFO, &inf) < 0) {
perror("ioctl");
exit(1);
}
/* curses init.. */
initscr();
cbreak();
noecho();
timeout(0);
keypad(stdscr, TRUE);
scrollok(stdscr, TRUE);
clear();
keypress = getch();
while (keypress != 'q') {
queue_info.queue = queue;
if (ioctl(seqfd, SND_SEQ_IOCTL_GET_QUEUE_INFO, &queue_info) < 0) {
perror("ioctl");
break;
}
mvprintw(3, 5, " A L S A S E Q U E N C E R \n");
mvprintw(5, 5, "Queue : %d ", queue_info.queue);
mvprintw(6, 5, "State : %s", queue_info.running ? "Running" : "Stopped");
mvprintw(7, 5, "Time : %d.%09d s ",
queue_info.time.tv_sec, queue_info.time.tv_nsec);
mvprintw(8, 5, "Tick : %d ", queue_info.tick);
mvprintw(10, 5, "PPQ : %d ticks/beat ", queue_info.ppq);
mvprintw(11, 5, "Tempo : %d us/beat ", queue_info.tempo);
mvprintw(12, 5, "BPM : %.2f beats/minute ", 60.0E6 / (double) queue_info.tempo);
mvprintw(20, 5, "q - quit");
mvprintw(21, 5, "up/down : change tempo");
wrefresh(stdscr);
/* vary update rate depending on running state of timer */
if (queue_info.running) {
usleep(0.05E6);
} else {
usleep(0.5E6);
}
keypress = getch();
switch (keypress) {
case KEY_UP:
{
snd_seq_event_t ev;
/* and send tempo change event to the sequencer.... */
ev.source.port = 1;
ev.source.channel = 1;
ev.dest.queue = 1;
ev.dest.client = 255; /* broadcast */
ev.dest.port = 0;
ev.dest.channel = 0; /* don't care */
ev.flags = SND_SEQ_TIME_STAMP_TICK | SND_SEQ_TIME_MODE_ABS;
ev.time.tick = 0; /* now */
ev.type = SND_SEQ_EVENT_TEMPO;
ev.data.control.value = (60.0E6 / ((60.0E6 / (double) queue_info.tempo) + 1.0));
write_ev(&ev);
}
break;
case KEY_DOWN:
{
snd_seq_event_t ev;
/* and send tempo change event to the sequencer.... */
ev.source.port = 1;
ev.source.channel = 1;
ev.dest.queue = 1;
ev.dest.client = 255; /* broadcast */
ev.dest.port = 0;
ev.dest.channel = 0; /* don't care */
ev.flags = SND_SEQ_TIME_STAMP_TICK | SND_SEQ_TIME_MODE_ABS;
ev.time.tick = 0; /* now */
ev.type = SND_SEQ_EVENT_TEMPO;
ev.data.control.value = (60.0E6 / ((60.0E6 / (double) queue_info.tempo) - 1.0));
write_ev(&ev);
}
break;
}
}
endwin();
close(seqfd);
}
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