public DelayLine(uint sampleRate, float delayTimeMax)
{
_sampleRate = sampleRate;
SampleCountMax = IDelayLine.GetSampleCount(_sampleRate, delayTimeMax);
_workBuffer = new float[SampleCountMax];
SetDelay(delayTimeMax);
}
public void UpdateParameter(ref Reverb3dParameter parameter)
{
uint sampleRate = parameter.SampleRate / 1000;
EarlyDelayTime = new uint[20];
DryGain = parameter.DryGain;
PreviousFeedbackOutputDecayed.AsSpan().Fill(0);
PreviousPreDelayValue = 0;
EarlyReflectionsGain = FloatingPointHelper.Pow10(Math.Min(parameter.RoomGain + parameter.ReflectionsGain, 5000.0f) / 2000.0f);
LateReverbGain = FloatingPointHelper.Pow10(Math.Min(parameter.RoomGain + parameter.ReverbGain, 5000.0f) / 2000.0f);
float highFrequencyRoomGain = FloatingPointHelper.Pow10(parameter.RoomHf / 2000.0f);
if (highFrequencyRoomGain < 1.0f)
{
float tempA = 1.0f - highFrequencyRoomGain;
float tempB = 2.0f - ((2.0f * highFrequencyRoomGain) * FloatingPointHelper.Cos(256.0f * parameter.HfReference / parameter.SampleRate));
float tempC = MathF.Sqrt(MathF.Pow(tempB, 2) - (4.0f * (1.0f - highFrequencyRoomGain) * (1.0f - highFrequencyRoomGain)));
PreviousPreDelayGain = (tempB - tempC) / (2.0f * tempA);
TargetPreDelayGain = 1.0f - PreviousPreDelayGain;
}
else
{
PreviousPreDelayGain = 0.0f;
TargetPreDelayGain = 1.0f;
}
ReflectionDelayTime = IDelayLine.GetSampleCount(sampleRate, 1000.0f * (parameter.ReflectionDelay + parameter.ReverbDelayTime));
EchoLateReverbDecay = 0.6f * parameter.Diffusion * 0.01f;
for (int i = 0; i < FdnDelayLines.Length; i++)
{
FdnDelayLines[i].SetDelay(FdnDelayMinTimes[i] + (parameter.Density / 100 * (FdnDelayMaxTimes[i] - FdnDelayMinTimes[i])));
uint tempSampleCount = FdnDelayLines[i].CurrentSampleCount + DecayDelays1[i].CurrentSampleCount + DecayDelays2[i].CurrentSampleCount;
float tempA = (-60.0f * tempSampleCount) / (parameter.DecayTime * parameter.SampleRate);
float tempB = tempA / parameter.HfDecayRatio;
float tempC = FloatingPointHelper.Cos(128.0f * 0.5f * parameter.HfReference / parameter.SampleRate) / FloatingPointHelper.Sin(128.0f * 0.5f * parameter.HfReference / parameter.SampleRate);
float tempD = FloatingPointHelper.Pow10((tempB - tempA) / 40.0f);
float tempE = FloatingPointHelper.Pow10((tempB + tempA) / 40.0f) * 0.7071f;
DecayDirectFdnGain[i] = tempE * ((tempD * tempC) + 1.0f) / (tempC + tempD);
DecayCurrentFdnGain[i] = tempE * (1.0f - (tempD * tempC)) / (tempC + tempD);
DecayCurrentOutputGain[i] = (tempC - tempD) / (tempC + tempD);
DecayDelays1[i].SetDecayRate(EchoLateReverbDecay);
DecayDelays2[i].SetDecayRate(EchoLateReverbDecay * -0.9f);
}
for (int i = 0; i < EarlyDelayTime.Length; i++)
{
uint sampleCount = Math.Min(IDelayLine.GetSampleCount(sampleRate, (parameter.ReflectionDelay * 1000.0f) + (EarlyDelayTimes[i] * 1000.0f * ((parameter.ReverbDelayTime * 0.9998f) + 0.02f))), PreDelayLine.SampleCountMax);
EarlyDelayTime[i] = sampleCount;
}
}
public void SetDelay(float delayTime)
{
ConfigureDelay(IDelayLine.GetSampleCount(_sampleRate, delayTime));
}
public void UpdateParameter(ref ReverbParameter parameter)
{
uint sampleRate = (uint)FixedPointHelper.ToFloat((uint)parameter.SampleRate, FixedPointPrecision);
float preDelayTimeInMilliseconds = FixedPointHelper.ToFloat(parameter.PreDelayTime, FixedPointPrecision);
float earlyGain = FixedPointHelper.ToFloat(parameter.EarlyGain, FixedPointPrecision);
float coloration = FixedPointHelper.ToFloat(parameter.Coloration, FixedPointPrecision);
float decayTime = FixedPointHelper.ToFloat(parameter.DecayTime, FixedPointPrecision);
for (int i = 0; i < 10; i++)
{
EarlyDelayTime[i] = Math.Min(IDelayLine.GetSampleCount(sampleRate, EarlyDelayTimes[i] + preDelayTimeInMilliseconds), PreDelayLine.SampleCountMax) + 1;
EarlyGain[i] = EarlyGainBase[i] * earlyGain;
}
if (parameter.ChannelCount == 2)
{
EarlyGain[4] = EarlyGain[4] * 0.5f;
EarlyGain[5] = EarlyGain[5] * 0.5f;
}
PreDelayLineDelayTime = Math.Min(IDelayLine.GetSampleCount(sampleRate, PreDelayTimes[(int)parameter.EarlyMode] + preDelayTimeInMilliseconds), PreDelayLine.SampleCountMax);
ReadOnlySpan <float> fdnDelayTimes = GetFdnDelayTimesByLateMode(parameter.LateMode);
ReadOnlySpan <float> decayDelayTimes = GetDecayDelayTimesByLateMode(parameter.LateMode);
float highFrequencyDecayRatio = FixedPointHelper.ToFloat(parameter.HighFrequencyDecayRatio, FixedPointPrecision);
float highFrequencyUnknownValue = FloatingPointHelper.Cos(1280.0f / sampleRate);
for (int i = 0; i < 4; i++)
{
FdnDelayLines[i].SetDelay(fdnDelayTimes[i]);
DecayDelays[i].SetDelay(decayDelayTimes[i]);
float tempA = -3 * (DecayDelays[i].CurrentSampleCount + FdnDelayLines[i].CurrentSampleCount);
float tempB = tempA / (decayTime * sampleRate);
float tempC;
float tempD;
if (highFrequencyDecayRatio < 0.995f)
{
float tempE = FloatingPointHelper.Pow10((((1.0f / highFrequencyDecayRatio) - 1.0f) * 2) / 100 * (tempB / 10));
float tempF = 1.0f - tempE;
float tempG = 2.0f - (tempE * 2 * highFrequencyUnknownValue);
float tempH = MathF.Sqrt((tempG * tempG) - (tempF * tempF * 4));
tempC = (tempG - tempH) / (tempF * 2);
tempD = 1.0f - tempC;
}
else
{
// no high frequency decay ratio
tempC = 0.0f;
tempD = 1.0f;
}
HighFrequencyDecayDirectGain[i] = FloatingPointHelper.Pow10(tempB / 1000) * tempD * 0.7071f;
HighFrequencyDecayPreviousGain[i] = tempC;
PreviousFeedbackOutput[i] = 0.0f;
DecayDelays[i].SetDecayRate(0.6f * (1.0f - coloration));
}
}