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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 "desire.h"
//#include "s_stuff.h"
#define MAX_EVENT_SIZE 256
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) {
return ((unsigned short)Second << 7) | (unsigned short)First;
}
void sys_alsa_do_open_midi(int nmidiin, int *midiinvec, int nmidiout, int *midioutvec) {
char portname[50];
int err = 0;
snd_seq_client_info_t *alsainfo;
/* do we want to connect pd automatically with other devices ?; see below! */
/* LATER: think about a flag to enable/disable automatic connection (sometimes it could be a pain) */
int autoconnect = 1;
alsa_nmidiin = 0;
alsa_nmidiout = 0;
if (nmidiout == 0 && nmidiin == 0) return;
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;
}
int client;
for (int i=0; i<nmidiin; i++) {
sprintf(portname,"Pure Data Midi-In %d",i+1);
int 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);
if (port < 0) goto error;
alsa_midiinfd[i] = port;
}
for (int i=0; i<nmidiout; i++) {
sprintf(portname,"Pure Data Midi-Out %d",i+1);
int port = snd_seq_create_simple_port(midi_handle,portname,
SND_SEQ_PORT_CAP_READ | SND_SEQ_PORT_CAP_SUBS_READ, SND_SEQ_PORT_TYPE_APPLICATION);
if (port < 0) goto error;
alsa_midioutfd[i] = port;
}
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(MAX_EVENT_SIZE,&midiev);
alsa_nmidiout = nmidiout;
alsa_nmidiin = nmidiin;
/* JMZ: connect all available devices to pd */
if (autoconnect) {
snd_seq_client_info_t *cinfo;
snd_seq_port_info_t *pinfo;
snd_seq_port_subscribe_t *subs;
snd_seq_addr_t other, topd, frompd;
/* since i don't know how to connect multiple ports (connect everything to each port, modulo,...),
* i only fully connect where we have only one single port */
if(alsa_nmidiin ) { topd.client = client; topd.port = alsa_midiinfd [0];}
if(alsa_nmidiout) {frompd.client = client; frompd.port = alsa_midioutfd[0];}
snd_seq_port_subscribe_alloca(&subs);
snd_seq_client_info_alloca(&cinfo);
snd_seq_port_info_alloca(&pinfo);
snd_seq_client_info_set_client(cinfo, -1);
while (snd_seq_query_next_client(midi_handle, cinfo) >= 0) {
/* reset query info */
int client_id=snd_seq_client_info_get_client(cinfo);
if((SND_SEQ_CLIENT_SYSTEM != client_id)&&(client != client_id)) { /* skipping port 0 and ourself */
snd_seq_port_info_set_client(pinfo, client_id);
snd_seq_port_info_set_port(pinfo, -1);
while (snd_seq_query_next_port(midi_handle, pinfo) >= 0) {
other.client=client_id;
other.port =snd_seq_port_info_get_port(pinfo);
if(1==alsa_nmidiin) /* only autoconnect 1st port */ {
snd_seq_port_subscribe_set_sender(subs, &other);
snd_seq_port_subscribe_set_dest(subs, &topd);
snd_seq_subscribe_port(midi_handle, subs);
}
if(1==alsa_nmidiout) /* only autoconnect 1st port */ {
snd_seq_port_subscribe_set_sender(subs, &frompd);
snd_seq_port_subscribe_set_dest(subs, &other);
snd_seq_subscribe_port(midi_handle, subs);
}
}
}
}
}
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 = a&15;
snd_seq_event_t ev;
snd_seq_ev_clear(&ev);
if (portno >= 0 && portno < alsa_nmidiout) {
if (a >= 224) { // pitchbend
snd_seq_ev_set_pitchbend(&ev,channel,CombineBytes(b,c));
} else if (a >= 208) { // touch
snd_seq_ev_set_chanpress(&ev,channel,b);
} else if (a >= 192) { // program
snd_seq_ev_set_pgmchange(&ev,channel,b);
} else if (a >= 176) { // controller
snd_seq_ev_set_controller(&ev,channel,b,c);
} else if (a >= 160) { // polytouch
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);
}
}
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;
snd_seq_ev_set_sysex(&ev,1,&data); //...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() {
unsigned char buf[MAX_EVENT_SIZE];
int count, alsa_source;
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,sizeof(buf),midievent);
alsa_source = midievent->dest.port;
for(int i=0; i<count; i++) sys_midibytein(alsa_source, (buf[i] & 0xff));
//post("received %d midi bytes",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() {
if (alsa_initted) return;
alsa_initted = 1;
}
void midi_alsa_getdevs(char *indevlist, int *nindevs, char *outdevlist, int *noutdevs, int maxndev, int devdescsize) {
int ndev = min(maxndev,alsa_nmidiindevs);
for (int i=0; i<ndev; i++) sprintf(indevlist + i * devdescsize, "ALSA MIDI device #%d", i+1);
*nindevs = ndev;
ndev = min(maxndev,alsa_nmidioutdevs);
for (int i=0; i<ndev; i++) sprintf(outdevlist + i * devdescsize, "ALSA MIDI device #%d", i+1);
*noutdevs = ndev;
}
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