/* add an ideal lowpass filter to the spec list */
public static void AddIdealLPToEffectSpecList(
EffectSpecListRec EffectSpecList,
IdealLPSpecRec IdealLPSpec,
bool EnabledFlag)
{
AddGenericToEffectSpecList(EffectSpecList, EffectTypes.eIdealLowpassEffect, IdealLPSpec, EnabledFlag);
}
/* create anew ideal lowpass filter specification */
public static IdealLPSpecRec NewIdealLowpassSpec(
double Cutoff,
int Order)
{
IdealLPSpecRec IdealLPSpec = new IdealLPSpecRec();
IdealLPSpec.Order = Order;
IdealLPSpec.Cutoff = Cutoff;
return(IdealLPSpec);
}
/* create a new ideal lowpass processor */
public static IdealLPRec NewIdealLP(
IdealLPSpecRec Template,
SynthParamRec SynthParams)
{
IdealLPRec IdealLP = new IdealLPRec();
IdealLP.Cutoff = IdealLowpassSpecGetCutoff(Template);
IdealLP.Order = IdealLowpassSpecGetOrder(Template);
#if DEBUG
if ((IdealLP.Order < 1) || ((IdealLP.Order % 2) == 0))
{
// order must be positive odd integer
Debug.Assert(false);
throw new ArgumentException();
}
#endif
IdealLP.Order &= 0x1fffffff; /* some sanity -- will result in out of mem instead of gpf */
IdealLP.OneChannelLength = 1;
while (IdealLP.OneChannelLength < IdealLP.Order)
{
IdealLP.OneChannelLength = IdealLP.OneChannelLength << 1;
}
IdealLP.Coefficients = new AlignedWorkspace(IdealLP.Order);
int vectorPadding = 0;
#if VECTOR
if (EnableVector)
{
vectorPadding = Vector <float> .Count - 1;
}
#endif
IdealLP.LeftState = new AlignedWorkspace(IdealLP.OneChannelLength + vectorPadding);
IdealLP.RightState = new AlignedWorkspace(IdealLP.OneChannelLength + vectorPadding);
IdealLP.FilterEnabled = GenerateIdealLowPassImpulse(
IdealLP.Coefficients.Base,
IdealLP.Coefficients.Offset,
IdealLP.Order,
IdealLP.Cutoff,
SynthParams.dSamplingRate);
if (SynthParams.iSamplingRate < GetIdealLowpassMinSamplingRate(Template))
{
IdealLP.FilterEnabled = false;
}
return(IdealLP);
}
public static int GetIdealLowpassMinSamplingRate(IdealLPSpecRec IdealLPSpec)
{
return(IdealLPSpec.MinSamplingRate);
}
public static void SetIdealLowpassMinSamplingRate(IdealLPSpecRec IdealLPSpec, int minSamplingRate)
{
IdealLPSpec.MinSamplingRate = minSamplingRate;
}
/* get the order for the ideal lowpass filter */
public static int IdealLowpassSpecGetOrder(IdealLPSpecRec IdealLPSpec)
{
return(IdealLPSpec.Order);
}
/* get the cutoff frequency for the ideal lowpass filter */
public static double IdealLowpassSpecGetCutoff(IdealLPSpecRec IdealLPSpec)
{
return(IdealLPSpec.Cutoff);
}
/* check ideal lowpass filter effect */
public static SynthErrorCodes CheckIdealLowpassEffectForUnreferencedSamples(
IdealLPSpecRec IdealLPEffect,
CheckUnrefParamRec Param)
{
return(SynthErrorCodes.eSynthDone);
}
