public void Start(RegionPair region, int channel, int key, int velocity)
{
this.exclusiveClass = region.ExclusiveClass;
this.channel = channel;
this.key = key;
this.velocity = velocity;
if (velocity > 0)
{
// According to the Polyphone's implementation, the initial attenuation should be reduced to 40%.
// I'm not sure why, but this indeed improves the loudness variability.
var sampleAttenuation = 0.4F * region.InitialAttenuation;
var filterAttenuation = 0.5F * region.InitialFilterQ;
var decibels = 2 * SoundFontMath.LinearToDecibels(velocity / 127F) - sampleAttenuation - filterAttenuation;
noteGain = SoundFontMath.DecibelsToLinear(decibels);
}
else
{
noteGain = 0F;
}
cutoff = region.InitialFilterCutoffFrequency;
resonance = SoundFontMath.DecibelsToLinear(region.InitialFilterQ);
vibLfoToPitch = 0.01F * region.VibratoLfoToPitch;
modLfoToPitch = 0.01F * region.ModulationLfoToPitch;
modEnvToPitch = 0.01F * region.ModulationEnvelopeToPitch;
modLfoToCutoff = region.ModulationLfoToFilterCutoffFrequency;
modEnvToCutoff = region.ModulationEnvelopeToFilterCutoffFrequency;
dynamicCutoff = modLfoToCutoff != 0 || modEnvToCutoff != 0;
modLfoToVolume = region.ModulationLfoToVolume;
dynamicVolume = modLfoToVolume > 0.05F;
instrumentPan = SoundFontMath.Clamp(region.Pan, -50F, 50F);
instrumentReverb = 0.01F * region.ReverbEffectsSend;
instrumentChorus = 0.01F * region.ChorusEffectsSend;
volEnv.Start(region, key, velocity);
modEnv.Start(region, key, velocity);
vibLfo.StartVibrato(region, key, velocity);
modLfo.StartModulation(region, key, velocity);
oscillator.Start(synthesizer.SoundFont.WaveDataArray, region);
filter.ClearBuffer();
filter.SetLowPassFilter(cutoff, resonance);
smoothedCutoff = cutoff;
voiceState = VoiceState.Playing;
voiceLength = 0;
}
public static void Start(this Oscillator oscillator, short[] data, RegionPair region)
{
var sampleRate = region.Instrument.Sample.SampleRate;
var loopMode = region.SampleModes;
var start = region.SampleStart;
var end = region.SampleEnd;
var startLoop = region.SampleStartLoop;
var endLoop = region.SampleEndLoop;
var rootKey = region.RootKey;
var coarseTune = region.CoarseTune;
var fineTune = region.FineTune;
var scaleTuning = region.ScaleTuning;
oscillator.Start(data, loopMode, sampleRate, start, end, startLoop, endLoop, rootKey, coarseTune, fineTune, scaleTuning);
}
