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/* 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 ALSA */
#include <stdio.h>
#ifdef UNISTD
#include <unistd.h>
#endif
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <alsa/asoundlib.h>
#include "m_pd.h"
#include "s_stuff.h"
static int alsa_nmidiin;
static int alsa_midiinfd[MAXMIDIINDEV];
static int alsa_nmidiout;
static int alsa_midioutfd[MAXMIDIOUTDEV];
static snd_seq_t *midi_handle;
static snd_midi_event_t *midiev;
static unsigned short CombineBytes(unsigned char First, unsigned char Second)
{
unsigned short _14bit;
_14bit = (unsigned short)Second;
_14bit <<= 7;
_14bit |= (unsigned short)First;
return(_14bit);
}
void sys_alsa_do_open_midi(int nmidiin, int *midiinvec,
int nmidiout, int *midioutvec)
{
char portname[50];
int err = 0;
int client;
int i;
snd_seq_client_info_t *alsainfo;
alsa_nmidiin = 0;
alsa_nmidiout = 0;
if(nmidiin>MAXMIDIINDEV )
{
post("midi input ports reduced to maximum %d", MAXMIDIINDEV);
nmidiin=MAXMIDIINDEV;
}
if(nmidiout>MAXMIDIOUTDEV)
{
post("midi output ports reduced to maximum %d", MAXMIDIOUTDEV);
nmidiout=MAXMIDIOUTDEV;
}
if (nmidiin>0 && nmidiout>0)
err = snd_seq_open(&midi_handle,"default",SND_SEQ_OPEN_DUPLEX,0);
else if (nmidiin > 0)
err = snd_seq_open(&midi_handle,"default",SND_SEQ_OPEN_INPUT,0);
else if (nmidiout > 0)
err = snd_seq_open(&midi_handle,"default",SND_SEQ_OPEN_OUTPUT,0);
if (err!=0)
{
sys_setalarm(1000000);
post("couldn't open alsa sequencer");
return;
}
for (i=0;i<nmidiout;i++)
{
int port;
sprintf(portname,"Pure Data Midi-In %d",i+1);
port = snd_seq_create_simple_port(midi_handle,portname,SND_SEQ_PORT_CAP_WRITE |SND_SEQ_PORT_CAP_SUBS_WRITE , SND_SEQ_PORT_TYPE_APPLICATION);
alsa_midiinfd[i] = port;
if (port < 0) goto error;
}
for (i=0;i<nmidiin;i++)
{
int port;
sprintf(portname,"Pure Data Midi-Out %d",i+1);
port = snd_seq_create_simple_port(midi_handle,portname, SND_SEQ_PORT_CAP_SUBS_READ | SND_SEQ_PORT_CAP_READ, SND_SEQ_PORT_TYPE_APPLICATION);
alsa_midioutfd[i] = port;
if (port < 0) goto error;
}
if (nmidiout == 0 && nmidiin == 0) return;
snd_seq_client_info_malloc(&alsainfo);
snd_seq_get_client_info(midi_handle,alsainfo);
snd_seq_client_info_set_name(alsainfo,"Pure Data");
client = snd_seq_client_info_get_client(alsainfo);
snd_seq_set_client_info(midi_handle,alsainfo);
snd_seq_client_info_free(alsainfo);
post("Opened Alsa Client %d in:%d out:%d",client,nmidiin,nmidiout);
sys_setalarm(0);
snd_midi_event_new(20,&midiev);
alsa_nmidiout = nmidiout;
alsa_nmidiin = nmidiin;
return;
error:
sys_setalarm(1000000);
post("couldn't open alsa MIDI output device");
return;
}
#define md_msglen(x) (((x)<0xC0)?2:((x)<0xE0)?1:((x)<0xF0)?2:\
((x)==0xF2)?2:((x)<0xF4)?1:0)
void sys_alsa_putmidimess(int portno, int a, int b, int c)
{
int channel;
snd_seq_event_t ev;
snd_seq_ev_clear(&ev);
if (portno >= 0 && portno < alsa_nmidiout)
{
if (a >= 224) // pitchbend
{
channel = a-224;
snd_seq_ev_set_pitchbend(&ev,channel,CombineBytes(b,c));
}
else if (a >= 208) // touch
{
channel = a-208;
snd_seq_ev_set_chanpress(&ev,channel,b);
}
else if (a >= 192) // program
{
channel = a-192;
snd_seq_ev_set_pgmchange(&ev,channel,b);
}
else if (a >= 176) // controller
{
channel = a-176;
snd_seq_ev_set_controller(&ev,channel,b,c);
}
else if (a >= 160) // polytouch
{
channel = a-160;
snd_seq_ev_set_keypress(&ev,channel,b,c);
}
else if (a >= 144) // note
{
channel = a-144;
if (c)
snd_seq_ev_set_noteon(&ev,channel,b,c);
else
snd_seq_ev_set_noteoff(&ev,channel,b,c);
}
snd_seq_ev_set_direct(&ev);
snd_seq_ev_set_subs(&ev);
snd_seq_ev_set_source(&ev,alsa_midioutfd[portno]);
snd_seq_event_output_direct(midi_handle,&ev);
}
//post("%d %d %d\n",a,b,c);
}
void sys_alsa_putmidibyte(int portno, int byte)
{
snd_seq_event_t ev;
snd_seq_ev_clear(&ev);
if (portno >= 0 && portno < alsa_nmidiout)
{
// repack into 1 byte char and put somewhere to point at
unsigned char data = (unsigned char)byte;
unsigned char *dataptr = malloc(1);
memcpy(dataptr,&byte,1);
snd_seq_ev_set_sysex(&ev,1,dataptr); //...set_variable *should* have worked but didn't
snd_seq_ev_set_direct(&ev);
snd_seq_ev_set_subs(&ev);
snd_seq_ev_set_source(&ev,alsa_midioutfd[portno]);
snd_seq_event_output_direct(midi_handle,&ev);
}
}
/* this version uses the asynchronous "read()" ... */
void sys_alsa_poll_midi(void)
{
unsigned char buf[20];
int count, alsa_source;
int i;
snd_seq_event_t *midievent = NULL;
if (alsa_nmidiout == 0 && alsa_nmidiin == 0) return;
snd_midi_event_init(midiev);
if (!alsa_nmidiout && !alsa_nmidiin) return;
count = snd_seq_event_input_pending(midi_handle,1);
if (count != 0)
count = snd_seq_event_input(midi_handle,&midievent);
if (midievent != NULL)
{
count = snd_midi_event_decode(midiev,buf,20,midievent);
alsa_source = midievent->dest.port;
for(i=0;i<count;i++)
sys_midibytein(alsa_source, (buf[i] & 0xff));
//post("received %d midi bytes\n",count);
}
}
void sys_alsa_close_midi()
{
alsa_nmidiin = alsa_nmidiout = 0;
if(midi_handle)
{
snd_seq_close(midi_handle);
if(midiev)
{
snd_midi_event_free(midiev);
}
}
}
#define NSEARCH 10
static int alsa_nmidiindevs, alsa_nmidioutdevs, alsa_initted;
void midi_alsa_init(void)
{
int i;
if (alsa_initted)
return;
alsa_initted = 1;
}
void midi_alsa_getdevs(char *indevlist, int *nindevs,
char *outdevlist, int *noutdevs, int maxndev, int devdescsize)
{
int i, ndev;
if ((ndev = alsa_nmidiindevs) > maxndev)
ndev = maxndev;
for (i = 0; i < ndev; i++)
sprintf(indevlist + i * devdescsize, "ALSA MIDI device #%d", i+1);
*nindevs = ndev;
if ((ndev = alsa_nmidioutdevs) > maxndev)
ndev = maxndev;
for (i = 0; i < ndev; i++)
sprintf(outdevlist + i * devdescsize, "ALSA MIDI device #%d", i+1);
*noutdevs = ndev;
}
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