private void Interpolate(GeneratorParameters generatorParams, SampleArray blockBuffer, double increment, int start, int end)
{
double _end = generatorParams.CurrentState == GeneratorState.Loop ? this.LoopEndPhase - 1 : this.EndPhase - 1;
int index;
float s1, s2, mu;
while (start < end && generatorParams.Phase < _end)//do this until we reach an edge case or fill the buffer
{
index = (int)generatorParams.Phase;
s1 = Samples[index];
s2 = Samples[index + 1];
mu = (float)(generatorParams.Phase - index);
blockBuffer[start++] = s1 + mu * (s2 - s1);
generatorParams.Phase += increment;
}
while (start < end)//edge case, if in loop wrap to loop start else use duplicate sample
{
index = (int)generatorParams.Phase;
s1 = Samples[index];
if (generatorParams.CurrentState == GeneratorState.Loop)
{
s2 = Samples[(int)generatorParams.CurrentStart];
}
else
{
s2 = s1;
}
mu = (float)(generatorParams.Phase - index);
blockBuffer[start++] = s1 + mu * (s2 - s1);
generatorParams.Phase += increment;
}
}
public void Release(GeneratorParameters generatorParams)
{
if (LoopMode == LoopMode.LoopUntilNoteOff)
{
generatorParams.CurrentState = GeneratorState.PostLoop;
generatorParams.CurrentStart = StartPhase;
generatorParams.CurrentEnd = EndPhase;
}
}
public virtual void GetValues(GeneratorParameters generatorParams, SampleArray blockBuffer, double increment)
{
var proccessed = 0;
do
{
var samplesAvailable = (int)(Math.Ceiling((generatorParams.CurrentEnd - generatorParams.Phase) / increment));
if (samplesAvailable > blockBuffer.Length - proccessed)
{
while (proccessed < blockBuffer.Length)
{
blockBuffer[proccessed++] = GetValue(generatorParams.Phase);
generatorParams.Phase += increment;
}
}
else
{
var endProccessed = proccessed + samplesAvailable;
while (proccessed < endProccessed)
{
blockBuffer[proccessed++] = GetValue(generatorParams.Phase);
generatorParams.Phase += increment;
}
switch (generatorParams.CurrentState)
{
case GeneratorState.PreLoop:
generatorParams.CurrentStart = LoopStartPhase;
generatorParams.CurrentEnd = LoopEndPhase;
generatorParams.CurrentState = GeneratorState.Loop;
break;
case GeneratorState.Loop:
generatorParams.Phase += generatorParams.CurrentStart - generatorParams.CurrentEnd;
break;
case GeneratorState.PostLoop:
generatorParams.CurrentState = GeneratorState.Finished;
while (proccessed < blockBuffer.Length)
{
blockBuffer[proccessed++] = 0;
}
break;
}
}
} while (proccessed < blockBuffer.Length);
}
public override void GetValues(GeneratorParameters generatorParams, SampleArray blockBuffer, double increment)
{
int proccessed = 0;
do
{
int samplesAvailable = (int)Math.Ceiling((generatorParams.CurrentEnd - generatorParams.Phase) / increment);
if (samplesAvailable > blockBuffer.Length - proccessed)
{
Interpolate(generatorParams, blockBuffer, increment, proccessed, blockBuffer.Length);
return; //proccessed = blockBuffer.Length;
}
else
{
int endProccessed = proccessed + samplesAvailable;
Interpolate(generatorParams, blockBuffer, increment, proccessed, endProccessed);
proccessed = endProccessed;
switch (generatorParams.CurrentState)
{
case GeneratorState.PreLoop:
generatorParams.CurrentStart = LoopStartPhase;
generatorParams.CurrentEnd = LoopEndPhase;
generatorParams.CurrentState = GeneratorState.Loop;
break;
case GeneratorState.Loop:
generatorParams.Phase += generatorParams.CurrentStart - generatorParams.CurrentEnd;
break;
case GeneratorState.PostLoop:
generatorParams.CurrentState = GeneratorState.Finished;
while (proccessed < blockBuffer.Length)
{
blockBuffer[proccessed++] = 0f;
}
break;
}
}
}while (proccessed < blockBuffer.Length);
}