public void Increment(int samples)
{
do
{
var neededSamples = _stage.Time - _index;
if (neededSamples > samples)
{
_index += samples;
samples = 0;
}
else
{
_index = 0;
if (CurrentStage != EnvelopeState.None)
{
do
{
_stage = _stages[(int)++CurrentStage];
} while (_stage.Time == 0);
}
samples -= neededSamples;
}
} while (samples > 0);
var i = (int)(_stage.Graph.Length * (_index / (double)_stage.Time));
if (_stage.Reverse)
{
Value = (1f - _stage.Graph[i]) * _stage.Scale + _stage.Offset;
}
else
{
Value = _stage.Graph[i] * _stage.Scale + _stage.Offset;
}
}
public void QuickSetupSf2(int sampleRate, int note, short keyNumToHold, short keyNumToDecay, bool isVolumeEnvelope, EnvelopeDescriptor envelopeInfo)
{
Depth = envelopeInfo.Depth;
// Delay
_stages[0].Offset = 0;
_stages[0].Scale = 0;
_stages[0].Time = Math.Max(0, (int)(sampleRate * (envelopeInfo.DelayTime)));
// Attack
_stages[1].Offset = envelopeInfo.StartLevel;
_stages[1].Scale = envelopeInfo.PeakLevel - envelopeInfo.StartLevel;
_stages[1].Time = Math.Max(0, (int)(sampleRate * (envelopeInfo.AttackTime)));
_stages[1].Graph = Tables.EnvelopeTables(envelopeInfo.AttackGraph);
// Hold
_stages[2].Offset = 0;
_stages[2].Scale = envelopeInfo.PeakLevel;
_stages[2].Time = (int)Math.Max(0, sampleRate * (envelopeInfo.HoldTime) * Math.Pow(2, ((60 - note) * keyNumToHold) / 1200.0));
// Decay
_stages[3].Offset = envelopeInfo.SustainLevel;
_stages[3].Scale = envelopeInfo.PeakLevel - envelopeInfo.SustainLevel;
if (envelopeInfo.SustainLevel == envelopeInfo.PeakLevel)
{
_stages[3].Time = 0;
}
else
{
_stages[3].Time = Math.Max(0, (int)(sampleRate * (envelopeInfo.DecayTime) * Math.Pow(2, ((60 - note) * keyNumToDecay) / 1200.0)));
}
_stages[3].Graph = Tables.EnvelopeTables(envelopeInfo.DecayGraph);
// Sustain
_stages[4].Offset = 0;
_stages[4].Scale = envelopeInfo.SustainLevel;
_stages[4].Time = (int)(sampleRate * envelopeInfo.SustainTime);
// Release
_stages[5].Scale = _stages[3].Time == 0 && _stages[4].Time == 0 ? envelopeInfo.PeakLevel : _stages[4].Scale;
if (isVolumeEnvelope)
{
_stages[5].Offset = -100;
_stages[5].Scale += 100;
_stages[6].Scale = -100;
}
else
{
_stages[5].Offset = 0;
_stages[6].Scale = 0;
}
_stages[5].Time = Math.Max(0, (int)(sampleRate * (envelopeInfo.ReleaseTime)));
_stages[5].Graph = Tables.EnvelopeTables(envelopeInfo.ReleaseGraph);
_index = 0;
Value = 0;
CurrentStage = EnvelopeState.Delay;
while (_stages[(int)CurrentStage].Time == 0)
{
CurrentStage++;
}
_stage = _stages[(int)CurrentStage];
}
public void Release(double lowerLimit)
{
if (Value <= lowerLimit)
{
_index = 0;
CurrentStage = EnvelopeState.None;
_stage = _stages[(int)CurrentStage];
}
else if (CurrentStage < EnvelopeState.Release)
{
_index = 0;
CurrentStage = EnvelopeState.Release;
_stage = _stages[(int)CurrentStage];
_stage.Scale = Value;
}
}
public Envelope()
{
Value = 0;
Depth = 0;
_stages = new EnvelopeStage[7];
for (int x = 0; x < _stages.Length; x++)
{
_stages[x] = new EnvelopeStage();
_stages[x].Graph = Tables.EnvelopeTables(0);
}
_stages[3].Reverse = true;
_stages[5].Reverse = true;
_stages[6].Time = 100000000;
CurrentStage = EnvelopeState.Delay;
_stage = _stages[(int)CurrentStage];
}
public Envelope()
{
Value = 0;
Depth = 0;
_stages = new EnvelopeStage[7];
for (int x = 0; x < _stages.Length; x++)
{
_stages[x] = new EnvelopeStage();
_stages[x].Graph = Tables.EnvelopeTables(0);
}
_stages[3].Reverse = true;
_stages[5].Reverse = true;
_stages[6].Time = 100000000;
CurrentStage = EnvelopeState.Delay;
_stage = _stages[(int)CurrentStage];
}
public void ReleaseSf2VolumeEnvelope()
{
if (Value <= -100)
{
_index = 0;
CurrentStage = EnvelopeState.None;
_stage = _stages[(int)CurrentStage];
}
else if (CurrentStage < EnvelopeState.Release)
{
_index = 0;
CurrentStage = EnvelopeState.Release;
_stage = _stages[(int)CurrentStage];
_stage.Offset = -100;
_stage.Scale = 100 + Value;
}
}
public void QuickSetupSf2(int sampleRate, int note, short keyNumToHold, short keyNumToDecay, bool isVolumeEnvelope, EnvelopeDescriptor envelopeInfo)
{
Depth = envelopeInfo.Depth;
// Delay
_stages[0].Offset = 0;
_stages[0].Scale = 0;
_stages[0].Time = Math.Max(0, (int)(sampleRate * (envelopeInfo.DelayTime)));
// Attack
_stages[1].Offset = envelopeInfo.StartLevel;
_stages[1].Scale = envelopeInfo.PeakLevel - envelopeInfo.StartLevel;
_stages[1].Time = Math.Max(0, (int)(sampleRate * (envelopeInfo.AttackTime)));
_stages[1].Graph = Tables.EnvelopeTables(envelopeInfo.AttackGraph);
// Hold
_stages[2].Offset = 0;
_stages[2].Scale = envelopeInfo.PeakLevel;
_stages[2].Time = (int) Math.Max(0, sampleRate * (envelopeInfo.HoldTime) * Math.Pow(2, ((60 - note) * keyNumToHold) / 1200.0));
// Decay
_stages[3].Offset = envelopeInfo.SustainLevel;
_stages[3].Scale = envelopeInfo.PeakLevel - envelopeInfo.SustainLevel;
if (envelopeInfo.SustainLevel == envelopeInfo.PeakLevel)
_stages[3].Time = 0;
else
_stages[3].Time = Math.Max(0, (int)(sampleRate * (envelopeInfo.DecayTime) * Math.Pow(2, ((60 - note) * keyNumToDecay) / 1200.0)));
_stages[3].Graph = Tables.EnvelopeTables(envelopeInfo.DecayGraph);
// Sustain
_stages[4].Offset = 0;
_stages[4].Scale = envelopeInfo.SustainLevel;
_stages[4].Time = (int) (sampleRate * envelopeInfo.SustainTime);
// Release
_stages[5].Scale = _stages[3].Time == 0 && _stages[4].Time == 0 ? envelopeInfo.PeakLevel : _stages[4].Scale;
if (isVolumeEnvelope)
{
_stages[5].Offset = -100;
_stages[5].Scale += 100;
_stages[6].Scale = -100;
}
else
{
_stages[5].Offset = 0;
_stages[6].Scale = 0;
}
_stages[5].Time = Math.Max(0, (int)(sampleRate * (envelopeInfo.ReleaseTime)));
_stages[5].Graph = Tables.EnvelopeTables(envelopeInfo.ReleaseGraph);
_index = 0;
Value = 0;
CurrentStage = EnvelopeState.Delay;
while (_stages[(int)CurrentStage].Time == 0)
{
CurrentStage++;
}
_stage = _stages[(int)CurrentStage];
}
public void ReleaseSf2VolumeEnvelope()
{
if (Value <= -100)
{
_index = 0;
CurrentStage = EnvelopeState.None;
_stage = _stages[(int)CurrentStage];
}
else if (CurrentStage < EnvelopeState.Release)
{
_index = 0;
CurrentStage = EnvelopeState.Release;
_stage = _stages[(int)CurrentStage];
_stage.Offset = -100;
_stage.Scale = 100 + Value;
}
}
public void Release(double lowerLimit)
{
if (Value <= lowerLimit)
{
_index = 0;
CurrentStage = EnvelopeState.None;
_stage = _stages[(int)CurrentStage];
}
else if (CurrentStage < EnvelopeState.Release)
{
_index = 0;
CurrentStage = EnvelopeState.Release;
_stage = _stages[(int)CurrentStage];
_stage.Scale = Value;
}
}
public void Increment(int samples)
{
do
{
var neededSamples = _stage.Time - _index;
if (neededSamples > samples)
{
_index += samples;
samples = 0;
}
else
{
_index = 0;
if (CurrentStage != EnvelopeState.None)
{
do
{
_stage = _stages[(int)++CurrentStage];
} while (_stage.Time == 0);
}
samples -= neededSamples;
}
} while (samples > 0);
var i = (int)(_stage.Graph.Length * (_index / (double)_stage.Time));
if (_stage.Reverse)
Value = (1f - _stage.Graph[i]) * _stage.Scale + _stage.Offset;
else
Value = _stage.Graph[i] * _stage.Scale + _stage.Offset;
}
