MidiMain.c++
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/******************************************************************************
*
* midiMain.c++
* Main function for the midi thread
*
*****************************************************************************/
#include <stdio.h>
#include <unistd.h>
#include <signal.h>
#include <strings.h>
#include <dmedia/midi.h>
#include "MidiMain.h"
#include "n64.h"
#include "AeN64Driver.h"
extern AeN64Driver * n64Driver;
// int gCurChanInst[MAX_SEQ_CHANNELS];
int numPorts;
MDport midiInPort[MAX_MIDI_PORTS];
MDevent midiEvents[MAX_MIDI_MSGS];
int midiFds[MAX_MIDI_PORTS];
fd_set inports;
int highfd;
int midiVerbose;
extern char verbose;
void ReceiveMidi(MDport inPort);
int initMidi(void);
void midiMain(void * arg)
{
int nfds, c;
if(initMidi() == MIDI_OK)
{
while(1)
{
nfds = select(highfd,&inports,0,0,0);
for (c = 0; c < numPorts; c++)
{
if (FD_ISSET(midiFds[c],&inports))
ReceiveMidi(midiInPort[c]);
else
FD_SET(midiFds[c],&inports);
}
}
}
// if you get here, there is no midi, don't quit or that will cause
// a child died signal. Instead just go to sleep forever.
while(1)
sleep(0xFFFFFFFF);
}
int initMidi(void)
{
int c;
char *portname;
numPorts=mdInit(); /* start midi lib stuff, and open in port */
if (numPorts<1)
{
if (verbose)
fprintf (stdout, "warning: no ports configured for midi.\n");
return(NO_MIDI);
}
if(numPorts>MAX_MIDI_PORTS)
{
fprintf(stdout,"warning:\tmore than %d ports configured for midi.\n",
MAX_MIDI_PORTS);
fprintf(stdout,"\t\tWill use only the first %d ports.\n",
MAX_MIDI_PORTS);
numPorts=MAX_MIDI_PORTS;
}
for(c=0;c<numPorts;c++)
{
portname=mdGetName(c);
if(portname==NULL)
{
fprintf(stdout,"error: port %d is not correctly set for midi.\n",c+1);
return(MIDI_INIT_ERR);
}
midiInPort[c]=mdOpenInPort(portname);
if(midiInPort[c]==NULL)
{
fprintf(stdout,"error: failure opening midi in port for %s\n",
portname);
return(MIDI_INIT_ERR);
}
mdSetStampMode(midiInPort[c],MD_NOSTAMP);
midiFds[c]=mdGetFd(midiInPort[c]);
FD_SET(midiFds[c],&inports);
highfd = midiFds[c] + 1;
if (verbose)
fprintf(stdout, "debug: %s successfully opened for MIDI receive\n",
portname);
}
return(MIDI_OK);
}
/********************************************************************
*
* Receive Midi. Primary midi receiving routine. Upon receiving
* midi, seperate out system exclusive, from regular status mesgs.
* Send regular messages in one block, for each system exclusive,
* Handle one at a time, by calling ProcessSysEx
*
*********************************************************************/
void ReceiveMidi(MDport inPort)
{
int validMsgs = 0;
int numMsgs,ct,msgType;
char chan;
unsigned char status;
CommPckt commPckt;
#ifdef TIMING_DEBUG
unsigned long long deltaTime,gioTime;
float deltaFlt;
#endif
numMsgs=mdReceive(inPort,midiEvents,MAX_MIDI_MSGS);
if(numMsgs < 0)
{
if (verbose)
fprintf(stdout,"error: received corrupt midi data\n");
return;
}
else if(numMsgs > 0)
{
for(ct=0;ct<numMsgs;ct++)
{
#ifdef TIMING_DEBUG
syssgi(SGI_GET_UST,&deltaTime,0);
deltaTime -= gMidiEvents[ct].stamp;
deltaFlt = deltaTime;
deltaFlt /= 1000; /* nanoseconds to microseconds */
#endif
status = midiEvents[ct].msg[0] & 0xF0;
if(status) /* status has a value */
{
switch(status)
{
case 0x80: /* note off */
case 0x90: /* note on */
case 0xA0: /* poly pressure */
case 0xB0: /* controller */
case 0xC0: /* program change */
case 0xD0: /* channel pressure */
case 0xE0: /* pitch bend */
commPckt.d.mb.mess[validMsgs].midiByte[0]=midiEvents[ct].msg[0];
commPckt.d.mb.mess[validMsgs].midiByte[1]=midiEvents[ct].msg[1];
commPckt.d.mb.mess[validMsgs].midiByte[2]=midiEvents[ct].msg[2];
validMsgs++;
break;
case 0xF0:
if(midiEvents[ct].msg[0] == 0xFF)
{
commPckt.d.mb.mess[validMsgs].midiByte[0]=midiEvents[ct].msg[0];
commPckt.d.mb.mess[validMsgs].midiByte[1]=midiEvents[ct].msg[1];
commPckt.d.mb.mess[validMsgs].midiByte[2]=midiEvents[ct].msg[2];
validMsgs++;
}
break;
}
if(midiVerbose)
fprintf(stdout, "midi data: %x %x %x\n",midiEvents[ct].msg[0],
midiEvents[ct].msg[1],midiEvents[ct].msg[2]);
}
}
if(validMsgs)
{
commPckt.pcktType = STATUS_TYPE;
commPckt.d.mb.numEvts = validMsgs;
if (n64Driver)
n64Driver->SendMidiBlock(&commPckt);
}
}
}