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using NUnit.Framework;
using Ryujinx.Audio.Renderer.Dsp;
using Ryujinx.Audio.Renderer.Parameter;
using System;
namespace Ryujinx.Tests.Audio.Renderer.Dsp
{
class ResamplerTests
{
[Test]
[TestCase(VoiceInParameter.SampleRateConversionQuality.Low)]
[TestCase(VoiceInParameter.SampleRateConversionQuality.Default)]
[TestCase(VoiceInParameter.SampleRateConversionQuality.High)]
public void TestResamplerConsistencyUpsampling(VoiceInParameter.SampleRateConversionQuality quality)
{
DoResamplingTest(44100, 48000, quality);
}
[Test]
[TestCase(VoiceInParameter.SampleRateConversionQuality.Low)]
[TestCase(VoiceInParameter.SampleRateConversionQuality.Default)]
[TestCase(VoiceInParameter.SampleRateConversionQuality.High)]
public void TestResamplerConsistencyDownsampling(VoiceInParameter.SampleRateConversionQuality quality)
{
DoResamplingTest(48000, 44100, quality);
}
/// <summary>
/// Generates a 1-second sine wave sample at input rate, resamples it to output rate, and
/// ensures that it resampled at the expected rate with no discontinuities
/// </summary>
/// <param name="inputRate">The input sample rate to test</param>
/// <param name="outputRate">The output sample rate to test</param>
/// <param name="quality">The resampler quality to use</param>
private static void DoResamplingTest(int inputRate, int outputRate, VoiceInParameter.SampleRateConversionQuality quality)
{
float inputSampleRate = inputRate;
float outputSampleRate = outputRate;
int inputSampleCount = inputRate;
int outputSampleCount = outputRate;
short[] inputBuffer = new short[inputSampleCount + 100]; // add some safety buffer at the end
float[] outputBuffer = new float[outputSampleCount + 100];
for (int sample = 0; sample < inputBuffer.Length; sample++)
{
// 440 hz sine wave with amplitude = 0.5f at input sample rate
inputBuffer[sample] = (short)(32767 * MathF.Sin((440 / inputSampleRate) * sample * MathF.PI * 2f) * 0.5f);
}
float fraction = 0;
ResamplerHelper.Resample(
outputBuffer.AsSpan(),
inputBuffer.AsSpan(),
inputSampleRate / outputSampleRate,
ref fraction,
outputSampleCount,
quality,
false);
float[] expectedOutput = new float[outputSampleCount];
float sumDifference = 0;
int delay = quality switch
{
VoiceInParameter.SampleRateConversionQuality.High => 3,
VoiceInParameter.SampleRateConversionQuality.Default => 1,
_ => 0,
};
for (int sample = 0; sample < outputSampleCount; sample++)
{
outputBuffer[sample] /= 32767;
// 440 hz sine wave with amplitude = 0.5f at output sample rate
expectedOutput[sample] = MathF.Sin((440 / outputSampleRate) * (sample + delay) * MathF.PI * 2f) * 0.5f;
float thisDelta = Math.Abs(expectedOutput[sample] - outputBuffer[sample]);
// Ensure no discontinuities
Assert.IsTrue(thisDelta < 0.1f);
sumDifference += thisDelta;
}
sumDifference /= outputSampleCount;
// Expect the output to be 99% similar to the expected resampled sine wave
Assert.IsTrue(sumDifference < 0.01f);
}
}
}
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