void appendMidi(MidiFile& outfile, const char* filename,
double seconds, int initQ) {
MidiFile infile(filename);
infile.joinTracks();
infile.deltaTicks();
int i;
int tpq;
int count;
MidiEvent anevent;
if (initQ == 0) {
outfile.joinTracks();
count = infile.getEventCount(0);
// don't include end-of-track meta event
count--;
tpq = infile.getTicksPerQuarterNote();
outfile.setTicksPerQuarterNote(tpq);
for (i=0; i<count; i++) {
anevent = infile.getEvent(0,i);
// storing as a type-0 file, so remove track information
anevent.track = 0;
outfile.addEvent(anevent);
}
return;
}
// presuming constant tpq for different files.
tpq = outfile.getTicksPerQuarterNote();
if (seconds > 0.0) {
// insert a tempo marking of 120, and then a pause related to how
// long in second to wait until next MIDI file contents.
// micro-seconds per quarter note is last three bytes of meta message
// If quarter note is 120 bpm, that is 0.5 seconds or 500000 usec.
// In hex 500000 is 07 a1 20
// Tempo meta event: ff 51 03 07 a1 20
vector<uchar> bpm120;
bpm120.resize(3);
bpm120[0] = 0x07;
bpm120[1] = 0xa1;
bpm120[2] = 0x20;
outfile.addMetaEvent(0, 0, 0x51, bpm120);
infile.getEvent(0,0).tick = int(seconds * 2 * tpq + 0.5);
}
count = infile.getEventCount(0);
// don't include end-of-track meta event
count--;
for (i=0; i<count; i++) {
anevent = infile.getEvent(0,i);
anevent.track = 0;
outfile.addEvent(anevent);
}
}
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();
}
