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Copyright (C) 4Front Technologies, 2002-2004. Released under GPLv2/CDDL.
This simple program opens a MIDI device file and displays everything it receives in hexadecimal format.
Please look at the "OSS MIDI Programming" section of the OSS Developer's manual for more info about MIDI programming.
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <soundcard.h>
#define DEVICE "/dev/midi"
int
main ()
{
int fd;
unsigned char buf[128];
int l;
if ((fd = open (DEVICE, O_RDONLY, 0)) == -1)
{
perror ("open " DEVICE);
exit (-1);
}
Note that read may return any number of bytes between 0 and sizeof(buf). -1 means that some error has occurred.
while ((l = read (fd, buf, sizeof (buf))) != -1)
{
int i;
for (i = 0; i < l; i++)
{
if (buf[i] & 0x80) /* Status byte */
printf ("\n");
printf ("%02x ", buf[i]);
}
fflush (stdout);
}
close (fd);
exit (0);
}