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/*
CsoundMIDI.m:
Copyright (C) 2011 Steven Yi, Victor Lazzarini
This file is part of Csound for iOS.
The Csound for iOS Library is free software; you can redistribute it
and/or modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
Csound 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with Csound; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA
*/
#import "CsoundMIDI.h"
#include <stdio.h>
#include <CoreMidi/CoreMidi.h>
#include <time.h>
#include <stdlib.h>
void ReadProc(const MIDIPacketList *pktlist, void *refcon, void *srcConnRefCon);
@implementation CsoundMIDI
/*=============================================*/
/* start coremidi - csound code */
/* MIDI message queue size */
#define DSIZE 1024
/* MIDI data struct */
typedef struct {
Byte status;
Byte data1;
Byte data2;
Byte flag;
} MIDIdata;
/* user data for MIDI callbacks */
typedef struct _cdata {
MIDIdata *mdata;
int p, q, pnot, pchn;
MIDIClientRef mclient;
} cdata;
/* coremidi callback, called when MIDI data is available */
void ReadProc(const MIDIPacketList *pktlist, void *refcon, void *srcConnRefCon){
cdata *data = (cdata *)refcon;
MIDIdata *mdata = data->mdata;
int *p = &data->p, i, j;
MIDIPacket *packet = &((MIDIPacketList *)pktlist)->packet[0];
Byte *curpack;
for (i = 0; i < pktlist->numPackets; i++) {
//printf("len %d \n", packet->length);
for(j=0; j < packet->length; j+=3){
while(mdata[*p].flag); /* in case data was not read, spin */
curpack = packet->data+j;
memcpy(&mdata[*p], curpack, 3);
mdata[*p].flag = 1;
(*p)++;
if(*p == DSIZE) *p = 0;
}
packet = MIDIPacketNext(packet);
}
}
/* csound MIDI input open callback, sets the device for input */
static int MidiInDeviceOpen(CSOUND *csound, void **userData, const char *dev)
{
int k;
ItemCount endpoints;
CFStringRef name = NULL, cname = NULL, pname = NULL;
CFStringEncoding defaultEncoding = CFStringGetSystemEncoding();
MIDIClientRef mclient = 0;
MIDIPortRef mport = 0;
MIDIEndpointRef endpoint;
MIDIdata *mdata = (MIDIdata *) malloc(DSIZE*sizeof(MIDIdata));
OSStatus ret;
cdata *refcon = (cdata *) malloc(sizeof(cdata));
memset(mdata, 0, sizeof(MIDIdata)*DSIZE);
refcon->mdata = mdata;
refcon->p = 0;
refcon->q = 0;
refcon->pnot = refcon->pchn = 0;
/* MIDI client */
cname = CFStringCreateWithCString(NULL, "my client", defaultEncoding);
ret = MIDIClientCreate(cname, NULL, NULL, &mclient);
if(!ret){
/* MIDI output port */
pname = CFStringCreateWithCString(NULL, "outport", defaultEncoding);
ret = MIDIInputPortCreate(mclient, pname, ReadProc, refcon, &mport);
if(!ret){
/* sources, we connect to all available input sources */
endpoints = MIDIGetNumberOfSources();
csoundMessage(csound, "midi srcs %lu\n", endpoints);
for(k=0; k < endpoints; k++){
endpoint = MIDIGetSource(k);
MIDIPortConnectSource(mport, endpoint, NULL);
}
}
}
refcon->mclient = mclient;
*userData = (void*) refcon;
if(name) CFRelease(name);
if(pname) CFRelease(pname);
if(cname) CFRelease(cname);
/* report success */
return 0;
}
/* used to distinguish between 1 and 2-byte messages */
static const int datbyts[8] = { 2, 2, 2, 2, 1, 1, 2, 0 };
/* csound MIDI read callback, called every k-cycle */
static int MidiDataRead(CSOUND *csound, void *userData,
unsigned char *mbuf, int nbytes)
{
cdata * data = (cdata *)userData;
if(data == NULL) return 0;
MIDIdata *mdata = data->mdata;
int *q = &data->q, st, d1, d2, n = 0;
/* check if there is new data on circular queue */
while (mdata[*q].flag) {
st = (int) mdata[*q].status;
d1 = (int) mdata[*q].data1;
d2 = (int) mdata[*q].data2;
if (st < 0x80)
goto next;
if (st >= 0xF0 &&
!(st == 0xF8 || st == 0xFA || st == 0xFB ||
st == 0xFC || st == 0xFF))
goto next;
nbytes -= (datbyts[(st - 0x80) >> 4] + 1);
if (nbytes < 0) break;
/* write to csound midi buffer */
n += (datbyts[(st - 0x80) >> 4] + 1);
switch (datbyts[(st - 0x80) >> 4]) {
case 0:
*mbuf++ = (unsigned char) st;
break;
case 1:
*mbuf++ = (unsigned char) st;
*mbuf++ = (unsigned char) d1;
break;
case 2:
*mbuf++ = (unsigned char) st;
*mbuf++ = (unsigned char) d1;
*mbuf++ = (unsigned char) d2;
break;
}
next:
mdata[*q].flag = 0;
(*q)++;
if(*q==DSIZE) *q = 0;
}
/* return the number of bytes read */
return n;
}
/* csound close device callback */
static int MidiInDeviceClose(CSOUND *csound, void *userData)
{
cdata * data = (cdata *)userData;
if (data != NULL) {
MIDIClientDispose(data->mclient);
free(data->mdata);
free(data);
}
return 0;
}
/* callback setting code */
+(void)setMidiInCallbacks:(CSOUND *)csound {
csoundSetHostImplementedMIDIIO(csound, 1);
csoundSetExternalMidiInOpenCallback(csound, MidiInDeviceOpen);
csoundSetExternalMidiReadCallback(csound, MidiDataRead);
csoundSetExternalMidiInCloseCallback(csound, MidiInDeviceClose);
}
@end
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