commit af0cd14c6307eb570e215173e9bda71ecf0d0204
parent c5e5c3b2efa0a8e2d1fef23294d4a2af21f640e9
Author: paulnasca <paulnasca>
Date: Sat, 27 Mar 2004 12:22:42 +0000
*** empty log message ***
Diffstat:
2 files changed, 198 insertions(+), 27 deletions(-)
diff --git a/src/Seq/MIDIFile.C b/src/Seq/MIDIFile.C
@@ -83,10 +83,6 @@ int MIDIFile::parsemidifile(){
int ntracks=getint16();//this is always if the format is "0"
printf("ntracks %d\n",ntracks);
- if (ntracks>=NUM_MIDI_CHANNELS){
- ntracks=NUM_MIDI_CHANNELS;
- };
-
int division=getint16();
printf("division %d\n",division);
if (division>=0){//delta time units in each a quater note
@@ -95,16 +91,23 @@ int MIDIFile::parsemidifile(){
printf("ERROR:in MIDIFile.C::parsemidifile() - SMPTE not implemented yet.");
};
-// for (int n=0;n<ntracks;n++){
- if (parsetrack(0)<0) {
+ for (int n=0;n<ntracks;n++){
+ if (parsetrack(n)<0) {
clearmidifile();
return(-1);
};
-// };
+ };
+
+ printf("\n\nCURRENT File position is = 0x%x\n",midifilek);
+ printf("\nMIDI file succesfully parsed.\n");
+// printf("\n0x%x\n",getbyte());
return(0);
};
+//private members
+
+
int MIDIFile::parsetrack(int ntrack){
printf("\n--==*Reading track %d **==--\n",ntrack);
@@ -112,26 +115,145 @@ int MIDIFile::parsetrack(int ntrack){
if (chunk!=0x4d54726b) return(-1);
int size=getint32();
- printf("%d\n",size);
+ printf("size = %d\n",size);
+
+ int oldmidifilek=midifilek;
+
+ unsigned char lastmsg=0;
+ unsigned int dt=0;
+
+ while(!midieof){
+ unsigned int msgdeltatime=getvarint32();
+
+ dt+=msgdeltatime;
+
+ int msg=peekbyte();
+ printf("raw msg=0x%x ",msg);
+ if (msg<0x80) {
+ msg=lastmsg;
+ } else {
+ lastmsg=msg;
+ getbyte();
+ };
+ printf("msg=0x%x\n",msg);
+
+ unsigned int mtype,mlength;
+
+ switch(msg){
+ case 0x80 ... 0x8f://note on off
+ parsenoteon(msg & 0x0f,dt);
+ dt=0;
+ break;
+ case 0x90 ... 0x9f://note on (or note off)
+ parsenoteon(msg & 0x0f,dt);
+ dt=0;
+ break;
+ case 0xa0 ... 0xaf://aftertouch - ignored
+ skipnbytes(2);
+ break;
+ case 0xb0 ... 0xbf://control change
+ parsecontrolchange(msg & 0x0f,dt);
+ dt=0;
+ break;
+ case 0xc0 ... 0xcf://program change - ignored
+ skipnbytes(1);
+ break;
+ case 0xd0 ... 0xdf://channel pressure - ignored
+ skipnbytes(1);
+ break;
+ case 0xe0 ... 0xef://channel mode messages
+ skipnbytes(2);
+ break;
+ case 0xf0://sysex - ignored
+ while (getbyte()!=0xf7){
+ if (midieof) break;
+ };
+ break;
+ case 0xf7://sysex (another type) - ignored
+ skipnbytes(getvarint32());
+ break;
+
+ case 0xff://meta-event
+ mtype=getbyte();
+ mlength=getbyte();
+ parsemetaevent(mtype,mlength);
+ break;
+
+ default:
+ getbyte();
+ printf("UNKNOWN message! 0x%x\n",msg);
+ return(-1);
+ break;
+ };
+
+ if (midieof) return(-1);
+
+ dt=msgdeltatime;
+
+ if ((midifilek-oldmidifilek)==size) break;
+ else if((midifilek-oldmidifilek)>size) return(-1);
// if (size!=6) return(-1);//header is always 6 bytes long
-/*
-unsigned long ReadVarLen( void ) {
- unsigned long value;
- byte c;
-
- if ((value = getc(infile)) & 0x80) {
- value &= 0x7f;
- do {
- value = (value << 7) + ((c = getc(infile)) & 0x7f);
- } while (c & 0x80);
- }
- return value;
-}
+ };
-*/
+ printf("End Track\n\n");
+
+ return(0);
+};
+
+
+void MIDIFile::parsenoteoff(char chan,unsigned int dt){
+ unsigned char note,vel;
+ note=getbyte();
+
+ if (chan>=NUM_MIDI_CHANNELS) return;
+
+ printf("Note off:%d ",note);
+};
+
+void MIDIFile::parsenoteon(char chan,unsigned int dt){
+ unsigned char note,vel;
+ note=getbyte();
+ vel=getbyte();
+
+ if (chan>=NUM_MIDI_CHANNELS) return;
+
+ printf("[dt %d ] Note on:%d %d\n",dt,note,vel);
+};
+
+void MIDIFile::parsecontrolchange(char chan,unsigned int dt){
+ unsigned char control,value;
+ control=getbyte();
+ value=getbyte();
+
+ if (chan>=NUM_MIDI_CHANNELS) return;
+
+ printf("[dt %d] Control change:%d %d\n",dt,control,value);
+
+};
+
+void MIDIFile::parsepitchwheel(char chan, unsigned int dt){
+ unsigned char valhi,vallo;
+ vallo=getbyte();
+ valhi=getbyte();
+
+ if (chan>=NUM_MIDI_CHANNELS) return;
+
+ int value=(int)valhi*128+vallo;
+
+ printf("[dt %d] Pitch wheel:%d\n",dt,value);
+
+};
+
+void MIDIFile::parsemetaevent(unsigned char mtype,unsigned char mlength){
+ int oldmidifilek=midifilek;
+ printf("meta-event type=0x%x length=%d\n",mtype,mlength);
+
+
+
+ midifilek=oldmidifilek+mlength;
+
};
-//private members
void MIDIFile::clearmidifile(){
if (midifile!=NULL) delete(midifile);
@@ -153,6 +275,14 @@ unsigned char MIDIFile::getbyte(){
return(midifile[midifilek++]);
};
+unsigned char MIDIFile::peekbyte(){
+ if (midifilek>=midifilesize) {
+ midieof=true;
+ return(0);
+ };
+ return(midifile[midifilek]);
+};
+
unsigned int MIDIFile::getint32(){
unsigned int result=0;
for (int i=0;i<4;i++) {
@@ -170,3 +300,27 @@ unsigned short int MIDIFile::getint16(){
if (midieof) result=0;
return(result);
};
+
+unsigned int MIDIFile::getvarint32(){
+ unsigned long result=0;
+ unsigned char b;
+
+ if ((result = getbyte()) & 0x80) {
+ result &= 0x7f;
+ do {
+ b=getbyte();
+ result = (result << 7) + (b & 0x7f);
+ }while (b & 0x80);
+ }
+ return result;
+};
+
+
+void MIDIFile::skipnbytes(int n){
+ midifilek+=n;
+ if (midifilek>=midifilesize){
+ midifilek=midifilesize-1;
+ midieof=true;
+ };
+};
+
diff --git a/src/Seq/MIDIFile.h b/src/Seq/MIDIFile.h
@@ -36,25 +36,42 @@ class MIDIFile{
//returns -1 if there is an error, otherwise 0
int parsemidifile();
- //returns -1 if there is an error, otherwise 0
- int parsetrack(int ntrack);
-
private:
unsigned char *midifile;
int midifilesize,midifilek;
bool midieof;
+
+ //returns -1 if there is an error, otherwise 0
+ int parsetrack(int ntrack);
+
+ void parsenoteoff(char chan,unsigned int dt);
+ void parsenoteon(char chan,unsigned int dt);
+ void parsecontrolchange(char chan,unsigned int dt);
+ void parsepitchwheel(char chan, unsigned int dt);
+ void parsemetaevent(unsigned char mtype,unsigned char mlength);
void clearmidifile();
+ /* Low Level MIDIfile functions */
+
//get a byte from the midifile
unsigned char getbyte();
+
+ //peek the current byte from the midifile
+ unsigned char peekbyte();
//get a set of 4 bytes from the midifile
unsigned int getint32();
//get a word of 2 bytes from the midifile
unsigned short int getint16();
-
+
+ //read a variable length quantity
+ unsigned int getvarint32();
+
+ //skip some bytes
+ void skipnbytes(int n);
+
struct {
double tick;//how many seconds one tick has
}data;
