/**
* Creates a new oscillator from a preset in a SoundFont file.
*
* @param frequency - The frequency determines what key was pressed.
* @parma preset - The SoundFont preset to get the sample data from.
* @param sampleRateInHz - The sample rate of the output synthesizer.
*/
public SoundFontOscillator(FrequencyProvider frequency, Preset preset, double sampleRateInHz) {
super(frequency);
logger_ = Logger.getLogger(getClass().getName());
preset_ = preset;
sampleRateInHz_ = sampleRateInHz;
// Find the max sample length.
maxSampleLength_ = 1;
for (Zone pzone : preset_.getZoneList()) {
Instrument instrument = pzone.getInstrument();
if (instrument != null) {
for (Zone izone : instrument.getZoneList()) {
Sample sample = izone.getSample();
int length = (int) Math.ceil((sampleRateInHz_ * izone.getCount()) / sample.getRate());
if (length > maxSampleLength_) {
maxSampleLength_ = length;
}
}
}
}
currentSample_ = null;
currentSampleIndex_ = 0;
buffer_ = new double[maxSampleLength_];
Arrays.fill(buffer_, 0.0);
bufferIndex_ = 0;
}
/** Initializes the "current sample" based on the given key and velocity. */
private synchronized void initSample(int key, int velocity) {
// Find any sample in this preset that can handle the given key and velocity.
currentSample_ = null;
for (Zone pzone : preset_.getZoneList()) {
Instrument instrument = pzone.getInstrument();
if (instrument != null) {
for (Zone izone : instrument.getZoneList()) {
if (izone.inKeyRange(key)
&& izone.inVelocityRange(velocity)
&& izone.getSample() != null) {
currentSample_ = izone;
currentSampleIndex_ = currentSample_.getStart();
return;
}
}
}
}
}
