/* Copyright (c) 1997-1999 Guenter Geiger, Miller Puckette, Larry Troxler,
* Winfried Ritsch, Karl MacMillan, and others.
* For information on usage and redistribution, and for a DISCLAIMER OF ALL
* WARRANTIES, see the file, "LICENSE.txt," in this distribution. */
/* MIDI I/O for Linux using OSS */
#include <stdio.h>
#ifdef UNIX
#include <unistd.h>
#endif
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include "m_pd.h"
#include "s_stuff.h"
static int oss_nmidiin;
static int oss_midiinfd[MAXMIDIINDEV];
static int oss_nmidiout;
static int oss_midioutfd[MAXMIDIOUTDEV];
static void oss_midiout(int fd, int n)
{
char b = n;
if ((write(fd, (char *) &b, 1)) != 1)
perror("midi write");
}
#define O_MIDIFLAG O_NDELAY
void sys_open_midi(int nmidiin, int *midiinvec, int nmidiout, int *midioutvec)
{
int i;
for (i = 0; i < nmidiout; i++)
oss_midioutfd[i] = -1;
for (i = 0, oss_nmidiin = 0; i < nmidiin; i++)
{
int fd = -1, j, outdevindex = -1;
char namebuf[80];
int devno = midiinvec[i];
for (j = 0; j < nmidiout; j++)
if (midioutvec[j] == midiinvec[i])
outdevindex = j;
/* try to open the device for read/write. */
if (devno == 1 && fd < 0 && outdevindex >= 0)
{
sys_setalarm(1000000);
fd = open("/dev/midi", O_RDWR | O_MIDIFLAG);
if (sys_verbose)
fprintf(stderr,
"device 1: tried /dev/midi READ/WRITE; returned %d\n", fd);
if (outdevindex >= 0 && fd >= 0)
oss_midioutfd[outdevindex] = fd;
}
if (fd < 0 && outdevindex >= 0)
{
sys_setalarm(1000000);
sprintf(namebuf, "/dev/midi%2.2d", devno-1);
fd = open(namebuf, O_RDWR | O_MIDIFLAG);
if (sys_verbose)
fprintf(stderr,
"device %d: tried %s READ/WRITE; returned %d\n",
devno, namebuf, fd);
if (outdevindex >= 0 && fd >= 0)
oss_midioutfd[outdevindex] = fd;
}
if (fd < 0 && outdevindex >= 0)
{
sys_setalarm(1000000);
sprintf(namebuf, "/dev/midi%d", devno-1);
fd = open(namebuf, O_RDWR | O_MIDIFLAG);
if (sys_verbose)
fprintf(stderr, "device %d: tried %s READ/WRITE; returned %d\n",
devno, namebuf, fd);
if (outdevindex >= 0 && fd >= 0)
oss_midioutfd[outdevindex] = fd;
}
if (devno == 1 && fd < 0)
{
sys_setalarm(1000000);
fd = open("/dev/midi", O_RDONLY | O_MIDIFLAG);
if (sys_verbose)
fprintf(stderr,
"device 1: tried /dev/midi READONLY; returned %d\n", fd);
}
if (fd < 0)
{
sys_setalarm(1000000);
sprintf(namebuf, "/dev/midi%2.2d", devno-1);
fd = open(namebuf, O_RDONLY | O_MIDIFLAG);
if (sys_verbose)
fprintf(stderr, "device %d: tried %s READONLY; returned %d\n",
devno, namebuf, fd);
}
if (fd < 0)
{
sys_setalarm(1000000);
sprintf(namebuf, "/dev/midi%d", devno-1);
fd = open(namebuf, O_RDONLY | O_MIDIFLAG);
if (sys_verbose)
fprintf(stderr, "device %d: tried %s READONLY; returned %d\n",
devno, namebuf, fd);
}
if (fd >= 0)
oss_midiinfd[oss_nmidiin++] = fd;
else post("couldn't open MIDI input device %d", devno);
}
for (i = 0, oss_nmidiout = 0; i < nmidiout; i++)
{
int fd = oss_midioutfd[i];
char namebuf[80];
int devno = midioutvec[i];
if (devno == 1 && fd < 0)
{
sys_setalarm(1000000);
fd = open("/dev/midi", O_WRONLY | O_MIDIFLAG);
if (sys_verbose)
fprintf(stderr,
"device 1: tried /dev/midi WRITEONLY; returned %d\n", fd);
}
if (fd < 0)
{
sys_setalarm(1000000);
sprintf(namebuf, "/dev/midi%2.2d", devno-1);
fd = open(namebuf, O_WRONLY | O_MIDIFLAG);
if (sys_verbose)
fprintf(stderr, "device %d: tried %s WRITEONLY; returned %d\n",
devno, namebuf, fd);
}
if (fd < 0)
{
sys_setalarm(1000000);
sprintf(namebuf, "/dev/midi%d", devno-1);
fd = open(namebuf, O_WRONLY | O_MIDIFLAG);
if (sys_verbose)
fprintf(stderr, "device %d: tried %s WRITEONLY; returned %d\n",
devno, namebuf, fd);
}
if (fd >= 0)
oss_midioutfd[oss_nmidiout++] = fd;
else post("couldn't open MIDI output device %d", devno);
}
if (oss_nmidiin < nmidiin || oss_nmidiout < nmidiout || sys_verbose)
post("opened %d MIDI input device(s) and %d MIDI output device(s).",
oss_nmidiin, oss_nmidiout);
}
#define md_msglen(x) (((x)<0xC0)?2:((x)<0xE0)?1:((x)<0xF0)?2:\
((x)==0xF2)?2:((x)<0xF4)?1:0)
void sys_putmidimess(int portno, int a, int b, int c)
{
if (portno >= 0 && portno < oss_nmidiout)
{
switch (md_msglen(a))
{
case 2:
oss_midiout(oss_midioutfd[portno],a);
oss_midiout(oss_midioutfd[portno],b);
oss_midiout(oss_midioutfd[portno],c);
return;
case 1:
oss_midiout(oss_midioutfd[portno],a);
oss_midiout(oss_midioutfd[portno],b);
return;
case 0:
oss_midiout(oss_midioutfd[portno],a);
return;
};
}
}
void sys_putmidibyte(int portno, int byte)
{
if (portno >= 0 && portno < oss_nmidiout)
oss_midiout(oss_midioutfd[portno], byte);
}
#if 0 /* this is the "select" version which doesn't work with OSS
driver for emu10k1 (it doesn't implement select.) */
void sys_poll_midi(void)
{
int i, throttle = 100;
struct timeval timout;
int did = 1, maxfd = 0;
while (did)
{
fd_set readset, writeset, exceptset;
did = 0;
if (throttle-- < 0)
break;
timout.tv_sec = 0;
timout.tv_usec = 0;
FD_ZERO(&writeset);
FD_ZERO(&readset);
FD_ZERO(&exceptset);
for (i = 0; i < oss_nmidiin; i++)
{
if (oss_midiinfd[i] > maxfd)
maxfd = oss_midiinfd[i];
FD_SET(oss_midiinfd[i], &readset);
}
select(maxfd+1, &readset, &writeset, &exceptset, &timout);
for (i = 0; i < oss_nmidiin; i++)
if (FD_ISSET(oss_midiinfd[i], &readset))
{
char c;
int ret = read(oss_midiinfd[i], &c, 1);
if (ret <= 0)
fprintf(stderr, "Midi read error\n");
else sys_midibytein(i, (c & 0xff));
did = 1;
}
}
}
#else
/* this version uses the asynchronous "read()" ... */
void sys_poll_midi(void)
{
int i, throttle = 100;
struct timeval timout;
int did = 1, maxfd = 0;
while (did)
{
fd_set readset, writeset, exceptset;
did = 0;
if (throttle-- < 0)
break;
for (i = 0; i < oss_nmidiin; i++)
{
char c;
int ret = read(oss_midiinfd[i], &c, 1);
if (ret < 0)
{
if (errno != EAGAIN)
perror("MIDI");
}
else if (ret != 0)
{
sys_midibytein(i, (c & 0xff));
did = 1;
}
}
}
}
#endif
void sys_close_midi()
{
int i;
for (i = 0; i < oss_nmidiin; i++)
close(oss_midiinfd[i]);
for (i = 0; i < oss_nmidiout; i++)
close(oss_midioutfd[i]);
oss_nmidiin = oss_nmidiout = 0;
}
void sys_listmididevs(void)
{
/* LATER figure out how to detect MIDI devs */
}