void Song::synthesize(VoiceLibrary library, ofstream& file){
int sampleRate = library.sampleRate;
fileio::writeWavHeader( sampleRate, file);
Phone phoneNow = library.getPhone(notes[0]);
Speech speech = Speech(phoneNow.sample.startToSound(0).compatibleSound(
vector<float>(phoneNow.overlap*sampleRate,0)
));//make empty speech to fill.
for(int note=0;note<notes.size();note++){
cerr<<notes[note].lyric; //log each lyric
float leftoverLength = speech.duration -phoneNow.overlap;
Phone phoneNext;
if(note+1<notes.size()){
phoneNext = library.getPhone(notes[note+1]);
//stretch next note
if(phoneNext.preutter>notes[note].length/tempo){
float newPreutter = notes[note].length/tempo;
float newOverlap = phoneNext.overlap * newPreutter/phoneNext.preutter;
phoneNext.sample.stretch(0,phoneNext.preutter,newPreutter);
phoneNext.preutter = newPreutter;
phoneNext.overlap = newOverlap;
}
}else{
phoneNext = Phone();
phoneNext.preutter=phoneNext.overlap=0;
}
//stretch current note
float targetLength = notes[note].length/tempo
-phoneNext.preutter
+phoneNext.overlap;
float vowelLength = min(
notes[note].duration/tempo,
targetLength
);
phoneNow.sample.stretch(
phoneNow.preutter,
phoneNow.sample.duration,
vowelLength
);
//add silence between notes if needed
float restLength = targetLength - vowelLength;
if(restLength!=0){
phoneNow.sample.add(
Speech(phoneNow.sample.startToSound(0).compatibleSound(
vector<float>(restLength*sampleRate,0)
)),
0
);
}
//add modified note to previous speech sample
speech.add(phoneNow.sample, phoneNow.overlap);
//transpose
float noteBoundary = leftoverLength +phoneNow.preutter;
float writeLength = noteBoundary +notes[note].length/tempo -phoneNext.preutter;
float freq1,freq2;
freq2 = freqFromNum(notes[note].notenum);
if(note!=0){
freq1 = freqFromNum(notes[note-1].notenum);
}else{
freq1 = freq2;
}
function<float (float)> frequency = [noteBoundary,freq1,freq2](float time){
if(time<noteBoundary){
return freq1;
}else{
return freq2;
}
};
speech.transpose(frequency,writeLength);
//pop&write
fileio::append(speech.pop(writeLength),file);
//reassign
phoneNow = phoneNext;
}
fileio::updateWavHeader(file);
}
