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/*
ZynAddSubFX - a software synthesizer
OSSMidiIn.C - Midi input for Open Sound System
Copyright (C) 2002-2005 Nasca Octavian Paul
Author: Nasca Octavian Paul
This program is free software; you can redistribute it and/or modify
it under the terms of version 2 of the GNU General Public License
as published by the Free Software Foundation.
This program 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 General Public License (version 2) for more details.
You should have received a copy of the GNU General Public License (version 2)
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/soundcard.h>
#include "OSSMidiIn.h"
#include "../Misc/Util.h"
OSSMidiIn::OSSMidiIn(){
inputok=0;
midi_handle=open(config.cfg.LinuxOSSSeqInDev,O_RDONLY,0);
if (midi_handle!=-1) inputok=1;
lastmidicmd=0;
cmdtype=0;
cmdchan=0;
};
OSSMidiIn::~OSSMidiIn(){
close(midi_handle);
};
unsigned char OSSMidiIn::readbyte(){
unsigned char tmp[4];
read(midi_handle,&tmp[0],1);
while (tmp[0]!=SEQ_MIDIPUTC){
read(midi_handle,&tmp[0],4);
};
return(tmp[1]);
};
unsigned char OSSMidiIn::getmidibyte(){
unsigned char b;
do {
b=readbyte();
} while (b==0xfe);//drops the Active Sense Messages
return(b);
};
/*
* Get the midi command,channel and parameters
*/
void OSSMidiIn::getmidicmd(MidiCmdType &cmdtype,unsigned char &cmdchan,int *cmdparams){
unsigned char tmp,i;
if (inputok==0) {
cmdtype=MidiNull;
return;
};
i=0;
if (lastmidicmd==0){//asteapta prima data pana cand vine prima comanda midi
while (tmp<0x80) tmp=getmidibyte();
lastmidicmd=tmp;
};
tmp=getmidibyte();
if (tmp>=0x80) {
lastmidicmd=tmp;
tmp=getmidibyte();
};
if ((lastmidicmd>=0x80)&&(lastmidicmd<=0x8f)){//Note OFF
cmdtype=MidiNoteOFF;
cmdchan=lastmidicmd%16;
cmdparams[0]=tmp;//note number
};
if ((lastmidicmd>=0x90)&&(lastmidicmd<=0x9f)){//Note ON
cmdtype=MidiNoteON;
cmdchan=lastmidicmd%16;
cmdparams[0]=tmp;//note number
cmdparams[1]=getmidibyte();//velocity
if (cmdparams[1]==0) cmdtype=MidiNoteOFF;//if velocity==0 then is note off
};
if ((lastmidicmd>=0xB0)&&(lastmidicmd<=0xBF)){//Controllers
cmdtype=MidiController;
cmdchan=lastmidicmd%16;
cmdparams[0]=getcontroller(tmp);
cmdparams[1]=getmidibyte();
};
if ((lastmidicmd>=0xE0)&&(lastmidicmd<=0xEF)){//Pitch Wheel
cmdtype=MidiController;
cmdchan=lastmidicmd%16;
cmdparams[0]=C_pitchwheel;
cmdparams[1]=(tmp+getmidibyte()*(int) 128)-8192;//hope this is correct
};
};
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