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Audren: Implement polyphase upsampler (#4256)

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* Audren: Implement polyphase upsampler

* prefer shifting to modulo

* prefer MathF

* fix nits

* rm ResampleForUpsampler

* oop

* Array20

* nits
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merry 2023-01-15 04:20:49 +00:00 • committed by GitHub
parent 8071c8c8c0
commit 41bba5310a
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5 changed files with 201 additions and 52 deletions
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47
Ryujinx.Audio/Renderer/Dsp/ResamplerHelper.cs
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@ -579,52 +579,5 @@ namespace Ryujinx.Audio.Renderer.Dsp
fraction -= (int)fraction;
}
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static void ResampleForUpsampler(Span<float> outputBuffer, ReadOnlySpan<float> inputBuffer, float ratio, ref float fraction, int sampleCount)
{
// Currently a simple cubic interpolation, assuming duplicated values at edges.
// TODO: Discover and use algorithm that the switch uses.
int inputBufferIndex = 0;
int maxIndex = inputBuffer.Length - 1;
int cubicEnd = inputBuffer.Length - 3;
for (int i = 0; i < sampleCount; i++)
{
float s0, s1, s2, s3;
s1 = inputBuffer[inputBufferIndex];
if (inputBufferIndex == 0 || inputBufferIndex > cubicEnd)
{
// Clamp interplation values at the ends of the input buffer.
s0 = inputBuffer[Math.Max(0, inputBufferIndex - 1)];
s2 = inputBuffer[Math.Min(maxIndex, inputBufferIndex + 1)];
s3 = inputBuffer[Math.Min(maxIndex, inputBufferIndex + 2)];
}
else
{
s0 = inputBuffer[inputBufferIndex - 1];
s2 = inputBuffer[inputBufferIndex + 1];
s3 = inputBuffer[inputBufferIndex + 2];
}
float a = s3 - s2 - s0 + s1;
float b = s0 - s1 - a;
float c = s2 - s0;
float d = s1;
float f2 = fraction * fraction;
float f3 = f2 * fraction;
outputBuffer[i] = a * f3 + b * f2 + c * fraction + d;
fraction += ratio;
inputBufferIndex += (int)MathF.Truncate(fraction);
fraction -= (int)fraction;
}
}
}
}