void createMidiFile(const char* filename, vector<vector<int> >& sequence) {
MidiFile midifile;
midifile.absoluteTicks();
midifile.addTrack(1);
int tpq = 120;
double beat = 0.0;
midifile.setTicksPerQuarterNote(tpq);
MidiEvent tempo;
tempo.setMetaTempo(60.0);
tempo.track = 0;
tempo.tick = 0;
midifile.addEvent(tempo);
int maxlen = 0;
int i, j;
for (i=0; i<(int)sequence.size(); i++) {
if ((int)sequence[i].size() > maxlen) {
maxlen = sequence[i].size();
}
}
vector<int> notelist;
MidiEvent noteon(0x90, 0, 64);
MidiEvent noteoff(0x80, 0, 64);
noteon.track = 1;
noteoff.track = 1;
for (i=0; i<maxlen; i++) {
notelist.clear();
for (j=0; j<(int)sequence.size(); j++) {
if (i<(int)sequence[j].size()) {
notelist.push_back(sequence[j][i]);
}
}
for (j=0; j<(int)notelist.size(); j++) {
noteon[1] = 0x7f & notelist[j];
noteoff[1] = 0x7f & notelist[j];
noteon.tick = (int)(beat * tpq + 0.5);
noteoff.tick = (int)(beat * tpq + 1 * tpq + 0.5);
midifile.addEvent(noteon);
midifile.addEvent(noteoff);
}
beat += 1.0;
}
midifile.sortTracks();
midifile.write(filename);
}
void AddDrumTrack(MidiFile& midifile, int* data, int instrument, int ticks) {
vector<uchar> midievent; // temporary storage for MIDI events
midievent.resize(3); // set the size of the array to 3 bytes
midievent[2] = 64; // set the loudness to a constant value
int notestate = 0; // 0 = off, 1 = on
int i = 0;
int actiontime;
int track = midifile.addTrack(); // Add a track to the MIDI file
while (data[i] >= 0) {
switch (data[i]) {
case 'x': case 'X':
if (notestate) {
// turn off previous note
midievent[0] = 0x89;
midievent[1] = instrument;
actiontime = ticks * i - 1;
midifile.addEvent(track, actiontime, midievent);
}
// turn on current note
midievent[0] = 0x99;
midievent[1] = instrument;
actiontime = ticks * i;
midifile.addEvent(track, actiontime, midievent);
notestate = 1;
break;
case '0': case 'o': case 'O':
// turn off previous note
if (notestate) {
midievent[0] = 0x89;
midievent[1] = instrument;
actiontime = ticks * i - 1;
midifile.addEvent(track, actiontime, midievent);
notestate = 0;
}
break;
}
i++;
}
if (notestate) {
// turn off last note
midievent[0] = 0x89;
midievent[1] = instrument;
actiontime = ticks * i;
midifile.addEvent(track, actiontime, midievent);
}
}
void midiProcessing::generateMidiFile(const char *filePath, int size)
{
srand (time(NULL));
MidiFile outputFile;
outputFile.absoluteTime();
outputFile.addTrack(1);
outputFile.setTicksPerQuarterNote(tpq);
Array<uchar> midiEvent;
midiEvent.setSize(3);
int actionTime = 0;
int tempVectorIndex = 0;
std::vector<note> tempNote;
int tempIndex;
for (int i = 0; i < size; i++)
{
tempNote = midiProcessing::markovList.at(tempVectorIndex);
tempIndex = (rand() % (midiProcessing::markovList.at(tempVectorIndex).size()-1)) + 1;
midiEvent[0] = 0x90;
midiEvent[1] = tempNote.at(tempIndex).getNumber();
midiEvent[2] = tempNote.at(tempIndex).getVelocity();
outputFile.addEvent(1, actionTime, midiEvent);
midiEvent[0] = 0x80;
outputFile.addEvent(1, (tempNote.at(tempIndex).getDuration())+actionTime, midiEvent);
actionTime += tempNote.at(tempIndex).getRest();
for (int j = 0; j < midiProcessing::markovList.size(); j++)
{
if (midiProcessing::markovList.at(j).at(0).getNumber() == tempNote.at(tempIndex).getNumber())
{
tempVectorIndex = j;
break;
}
}
}
outputFile.sortTracks();
outputFile.write(filePath);
}
void createMidiFile(MidiFile& midifile, HumdrumFile& infile) {
Array<int> millitimes;
Array<double> velocities;
Array<int> keynum;
Array<int> track;
millitimes.setSize(infile.getNumLines());
velocities.setSize(infile.getNumLines());
keynum.setSize(infile.getNumLines());
track.setSize(infile.getNumLines());
millitimes.setSize(0);
velocities.setSize(0);
keynum.setSize(0);
track.setSize(0);
int intval;
double floatval;
double dmax = -100000;
double dmin = +100000;
int i;
for (i=0; i<infile.getNumLines(); i++) {
if (!infile[i].isData()) {
continue;
}
sscanf(infile[i][0], "%lf", &floatval);
intval = int(floatval * 1000.0 + 0.5);
millitimes.append(intval);
sscanf(infile[i][1], "%lf", &floatval);
velocities.append(floatval);
if (floatval < dmin) { dmin = floatval; }
if (floatval > dmax) { dmax = floatval; }
intval = getMIDIKeyNum(infile[i][2]);
keynum.append(intval);
intval = getTrackNumber(infile[i][2]);
track.append(intval);
}
millitimes.allowGrowth(0);
velocities.allowGrowth(0);
keynum.allowGrowth(0);
track.allowGrowth(0);
// normalize the dynamics data into the range from 0 to 1
double diff = dmax - dmin;
for (i=0; i<velocities.getSize(); i++) {
if (diff > 0.0) {
velocities[i] = (velocities[i] - dmin) / diff;
} else {
velocities[i] = 0.5;
}
}
// now ready to write the data to the MIDI file:
midifile.setMillisecondDelta(); // SMPTE 25 frames & 40 subframes
midifile.absoluteTime(); // Time values inserted are absolute
midifile.addTrack(2); // Right and Left hands
Array<uchar> event;
event.setSize(3);
int intdur = int(duration * 1000.0 + 0.5);
int lasttime = 0;
int dyndiff = maxdyn - mindyn;
int vel;
for (i=0; i<millitimes.getSize(); i++) {
if ((keynum[i] <= 10) || (keynum[i] > 127)) {
continue;
}
vel = int(velocities[i] * dyndiff + mindyn + 0.5);
if (vel < 1) { vel = 1; }
if (vel > 127) { vel = 127; }
event[0] = 0x90; // note-on
event[1] = keynum[i];
event[2] = vel;
midifile.addEvent(track[i], millitimes[i], event);
event[2] = 0;
lasttime = millitimes[i] + intdur;
midifile.addEvent(track[i], lasttime, event);
}
// write the end of track marker
event[0] = 0xff;
event[1] = 0x2f;
event[2] = 0;
for (i=0; i<midifile.getTrackCount(); i++) {
if (i>0) {
// have to lengthen the last note in track due to bugs
// in various MIDI playback programs which clip
// the last chord of a file
midifile.getEvent(i, midifile.getNumEvents(i)-1).time += 1500;
}
midifile.addEvent(i, lasttime+2000, event);
}
// add comments from header
for (i=0; i<infile.getNumLines() && i<lasttime; i++) {
if (infile[i].isBibliographic() || infile[i].isGlobalComment()) {
// 0x01 is a text event
midifile.addMetaEvent(0, i, 0x01, infile[i].getLine());
}
}
// sort the ontimes and offtimes so they are in correct time order:
midifile.sortTracks();
}
