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Small FFT change I had stashed.

This commit is contained in:
J.D. Purcell 2019-10-21 00:10:28 -04:00
parent 952609eeaa
commit c956b5993b
2 changed files with 5 additions and 4 deletions
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7
BizHawk.Emulation.Cores/Computers/Commodore64/FFT.cs
View File

@ -6,7 +6,6 @@
namespace BizHawk.Emulation.Cores.Computers.Commodore64
{
public class RealFFT
{
private readonly int _length;
@ -15,12 +14,13 @@ namespace BizHawk.Emulation.Cores.Computers.Commodore64
public readonly double ForwardScaleFactor;
public readonly double ReverseScaleFactor;
public readonly double CorrectionScaleFactor;
public RealFFT(int length)
{
if (length < 2 || (length & (length - 1)) != 0)
{
throw new ArgumentException("length", "FFT length must be at least 2 and a power of 2.");
throw new ArgumentException("FFT length must be at least 2 and a power of 2.", nameof(length));
}
_length = length;
@ -29,6 +29,7 @@ namespace BizHawk.Emulation.Cores.Computers.Commodore64
ForwardScaleFactor = length;
ReverseScaleFactor = 0.5;
CorrectionScaleFactor = 1.0 / (ForwardScaleFactor * ReverseScaleFactor);
}
public void ComputeForward(double[] buff)
@ -45,7 +46,7 @@ namespace BizHawk.Emulation.Cores.Computers.Commodore64
{
if (buff.Length < _length)
{
throw new ArgumentException("buff", "Buffer length must be greater than or equal to the FFT length.");
throw new ArgumentException("Buffer length must be greater than or equal to the FFT length.", nameof(buff));
}
rdft(_length, reverse, buff, _ip, _w);

2
BizHawk.Emulation.Cores/Computers/Commodore64/MOS/Sid.cs
View File

@ -324,7 +324,7 @@ namespace BizHawk.Emulation.Cores.Computers.Commodore64.MOS
//re-sample back down to the original number of samples
for (double i = 0; i < nsamp; i++)
{
_outputBufferFiltered[(int)i + _filterIndex] = (int)(_fftBuffer[(int)Math.Ceiling((i / (nsamp - 1) * (nsamp_2 - 1)))]/(nsamp_2/2));
_outputBufferFiltered[(int)i + _filterIndex] = (int)(_fftBuffer[(int)Math.Ceiling((i / (nsamp - 1) * (nsamp_2 - 1)))] * _fft.CorrectionScaleFactor);
if (_outputBufferFiltered[(int)i + _filterIndex] < 0)
{