Ryujinx/Ryujinx.Tests/Audio/Renderer/Dsp/UpsamplerTests.cs

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using NUnit.Framework;
using Ryujinx.Audio.Renderer.Dsp;
using Ryujinx.Audio.Renderer.Parameter;
using Ryujinx.Audio.Renderer.Server.Upsampler;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading.Tasks;
namespace Ryujinx.Tests.Audio.Renderer.Dsp
{
class UpsamplerTests
{
[Test]
public void TestUpsamplerConsistency()
{
UpsamplerBufferState bufferState = new UpsamplerBufferState();
int inputBlockSize = 160;
int numInputSamples = 32000;
int numOutputSamples = 48000;
float inputSampleRate = numInputSamples;
float outputSampleRate = numOutputSamples;
float[] inputBuffer = new float[numInputSamples + 100];
float[] outputBuffer = new float[numOutputSamples + 100];
for (int sample = 0; sample < inputBuffer.Length; sample++)
{
// 440 hz sine wave with amplitude = 0.5f at input sample rate
inputBuffer[sample] = MathF.Sin((440 / inputSampleRate) * (float)sample * MathF.PI * 2f) * 0.5f;
}
int inputIdx = 0;
int outputIdx = 0;
while (inputIdx + inputBlockSize < numInputSamples)
{
int outputBufLength = (int)Math.Round((float)(inputIdx + inputBlockSize) * outputSampleRate / inputSampleRate) - outputIdx;
UpsamplerHelper.Upsample(
outputBuffer.AsSpan(outputIdx),
inputBuffer.AsSpan(inputIdx),
outputBufLength,
inputBlockSize,
ref bufferState);
inputIdx += inputBlockSize;
outputIdx += outputBufLength;
}
float[] expectedOutput = new float[numOutputSamples];
float sumDifference = 0;
for (int sample = 0; sample < numOutputSamples; sample++)
{
// 440 hz sine wave with amplitude = 0.5f at output sample rate with an offset of 15
expectedOutput[sample] = MathF.Sin((440 / outputSampleRate) * (float)(sample - 15) * MathF.PI * 2f) * 0.5f;
sumDifference += Math.Abs(expectedOutput[sample] - outputBuffer[sample]);
}
sumDifference = sumDifference / (float)expectedOutput.Length;
// Expect the output to be 98% similar to the expected resampled sine wave
Assert.IsTrue(sumDifference < 0.02f);
}
}
}