mirror of
https://github.com/ryujinx-mirror/ryujinx.git
synced 2024-12-23 09:05:45 +00:00
Audren: Implement polyphase upsampler (#4256)
* Audren: Implement polyphase upsampler * prefer shifting to modulo * prefer MathF * fix nits * rm ResampleForUpsampler * oop * Array20 * nits
This commit is contained in:
merry
GitHub
parent
8071c8c8c0
commit
41bba5310a
5 changed files with 201 additions and 52 deletions
|
|
@ -40,6 +40,12 @@ namespace Ryujinx.Audio.Renderer.Dsp.Command
|
|||
info.InputBufferIndices[i] = (ushort)(bufferOffset + inputBufferOffset[i]);
|
||||
}
|
||||
|
||||
if (info.BufferStates?.Length != (int)inputCount)
|
||||
{
|
||||
// Keep state if possible.
|
||||
info.BufferStates = new UpsamplerBufferState[(int)inputCount];
|
||||
}
|
||||
|
||||
UpsamplerInfo = info;
|
||||
}
|
||||
|
||||
|
|
@ -50,8 +56,6 @@ namespace Ryujinx.Audio.Renderer.Dsp.Command
|
|||
|
||||
public void Process(CommandList context)
|
||||
{
|
||||
float ratio = (float)InputSampleRate / Constants.TargetSampleRate;
|
||||
|
||||
uint bufferCount = Math.Min(BufferCount, UpsamplerInfo.SourceSampleCount);
|
||||
|
||||
for (int i = 0; i < bufferCount; i++)
|
||||
|
|
@ -59,9 +63,7 @@ namespace Ryujinx.Audio.Renderer.Dsp.Command
|
|||
Span<float> inputBuffer = context.GetBuffer(UpsamplerInfo.InputBufferIndices[i]);
|
||||
Span<float> outputBuffer = GetBuffer(UpsamplerInfo.InputBufferIndices[i], (int)UpsamplerInfo.SampleCount);
|
||||
|
||||
float fraction = 0.0f;
|
||||
|
||||
ResamplerHelper.ResampleForUpsampler(outputBuffer, inputBuffer, ratio, ref fraction, (int)(InputSampleCount / ratio));
|
||||
UpsamplerHelper.Upsample(outputBuffer, inputBuffer, (int)UpsamplerInfo.SampleCount, (int)InputSampleCount, ref UpsamplerInfo.BufferStates[i]);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
|
|||
|
|
@ -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;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
175
Ryujinx.Audio/Renderer/Dsp/UpsamplerHelper.cs
Normal file
175
Ryujinx.Audio/Renderer/Dsp/UpsamplerHelper.cs
Normal file
|
|
@ -0,0 +1,175 @@
|
|||
using Ryujinx.Audio.Renderer.Server.Upsampler;
|
||||
using Ryujinx.Common.Memory;
|
||||
using System;
|
||||
using System.Diagnostics;
|
||||
using System.Runtime.CompilerServices;
|
||||
|
||||
namespace Ryujinx.Audio.Renderer.Dsp
|
||||
{
|
||||
public class UpsamplerHelper
|
||||
{
|
||||
private const int HistoryLength = UpsamplerBufferState.HistoryLength;
|
||||
private const int FilterBankLength = 20;
|
||||
// Bank0 = [0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
|
||||
private const int Bank0CenterIndex = 9;
|
||||
private static readonly Array20<float> Bank1 = PrecomputeFilterBank(1.0f / 6.0f);
|
||||
private static readonly Array20<float> Bank2 = PrecomputeFilterBank(2.0f / 6.0f);
|
||||
private static readonly Array20<float> Bank3 = PrecomputeFilterBank(3.0f / 6.0f);
|
||||
private static readonly Array20<float> Bank4 = PrecomputeFilterBank(4.0f / 6.0f);
|
||||
private static readonly Array20<float> Bank5 = PrecomputeFilterBank(5.0f / 6.0f);
|
||||
|
||||
private static Array20<float> PrecomputeFilterBank(float offset)
|
||||
{
|
||||
float Sinc(float x)
|
||||
{
|
||||
if (x == 0)
|
||||
{
|
||||
return 1.0f;
|
||||
}
|
||||
return (MathF.Sin(MathF.PI * x) / (MathF.PI * x));
|
||||
}
|
||||
|
||||
float BlackmanWindow(float x)
|
||||
{
|
||||
const float a = 0.18f;
|
||||
const float a0 = 0.5f - 0.5f * a;
|
||||
const float a1 = -0.5f;
|
||||
const float a2 = 0.5f * a;
|
||||
return a0 + a1 * MathF.Cos(2 * MathF.PI * x) + a2 * MathF.Cos(4 * MathF.PI * x);
|
||||
}
|
||||
|
||||
Array20<float> result = new Array20<float>();
|
||||
|
||||
for (int i = 0; i < FilterBankLength; i++)
|
||||
{
|
||||
float x = (Bank0CenterIndex - i) + offset;
|
||||
result[i] = Sinc(x) * BlackmanWindow(x / FilterBankLength + 0.5f);
|
||||
}
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
// Polyphase upsampling algorithm
|
||||
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
||||
public static void Upsample(Span<float> outputBuffer, ReadOnlySpan<float> inputBuffer, int outputSampleCount, int inputSampleCount, ref UpsamplerBufferState state)
|
||||
{
|
||||
if (!state.Initialized)
|
||||
{
|
||||
state.Scale = inputSampleCount switch
|
||||
{
|
||||
40 => 6.0f,
|
||||
80 => 3.0f,
|
||||
160 => 1.5f,
|
||||
_ => throw new ArgumentOutOfRangeException()
|
||||
};
|
||||
state.Initialized = true;
|
||||
}
|
||||
|
||||
if (outputSampleCount == 0)
|
||||
{
|
||||
return;
|
||||
}
|
||||
|
||||
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
||||
float DoFilterBank(ref UpsamplerBufferState state, in Array20<float> bank)
|
||||
{
|
||||
float result = 0.0f;
|
||||
|
||||
Debug.Assert(state.History.Length == HistoryLength);
|
||||
Debug.Assert(bank.Length == FilterBankLength);
|
||||
for (int j = 0; j < FilterBankLength; j++)
|
||||
{
|
||||
result += bank[j] * state.History[j];
|
||||
}
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
||||
void NextInput(ref UpsamplerBufferState state, float input)
|
||||
{
|
||||
state.History.AsSpan().Slice(1).CopyTo(state.History.AsSpan());
|
||||
state.History[HistoryLength - 1] = input;
|
||||
}
|
||||
|
||||
int inputBufferIndex = 0;
|
||||
|
||||
switch (state.Scale)
|
||||
{
|
||||
case 6.0f:
|
||||
for (int i = 0; i < outputSampleCount; i++)
|
||||
{
|
||||
switch (state.Phase)
|
||||
{
|
||||
case 0:
|
||||
NextInput(ref state, inputBuffer[inputBufferIndex++]);
|
||||
outputBuffer[i] = state.History[Bank0CenterIndex];
|
||||
break;
|
||||
case 1:
|
||||
outputBuffer[i] = DoFilterBank(ref state, Bank1);
|
||||
break;
|
||||
case 2:
|
||||
outputBuffer[i] = DoFilterBank(ref state, Bank2);
|
||||
break;
|
||||
case 3:
|
||||
outputBuffer[i] = DoFilterBank(ref state, Bank3);
|
||||
break;
|
||||
case 4:
|
||||
outputBuffer[i] = DoFilterBank(ref state, Bank4);
|
||||
break;
|
||||
case 5:
|
||||
outputBuffer[i] = DoFilterBank(ref state, Bank5);
|
||||
break;
|
||||
}
|
||||
|
||||
state.Phase = (state.Phase + 1) % 6;
|
||||
}
|
||||
break;
|
||||
case 3.0f:
|
||||
for (int i = 0; i < outputSampleCount; i++)
|
||||
{
|
||||
switch (state.Phase)
|
||||
{
|
||||
case 0:
|
||||
NextInput(ref state, inputBuffer[inputBufferIndex++]);
|
||||
outputBuffer[i] = state.History[Bank0CenterIndex];
|
||||
break;
|
||||
case 1:
|
||||
outputBuffer[i] = DoFilterBank(ref state, Bank2);
|
||||
break;
|
||||
case 2:
|
||||
outputBuffer[i] = DoFilterBank(ref state, Bank4);
|
||||
break;
|
||||
}
|
||||
|
||||
state.Phase = (state.Phase + 1) % 3;
|
||||
}
|
||||
break;
|
||||
case 1.5f:
|
||||
// Upsample by 3 then decimate by 2.
|
||||
for (int i = 0; i < outputSampleCount; i++)
|
||||
{
|
||||
switch (state.Phase)
|
||||
{
|
||||
case 0:
|
||||
NextInput(ref state, inputBuffer[inputBufferIndex++]);
|
||||
outputBuffer[i] = state.History[Bank0CenterIndex];
|
||||
break;
|
||||
case 1:
|
||||
outputBuffer[i] = DoFilterBank(ref state, Bank4);
|
||||
break;
|
||||
case 2:
|
||||
NextInput(ref state, inputBuffer[inputBufferIndex++]);
|
||||
outputBuffer[i] = DoFilterBank(ref state, Bank2);
|
||||
break;
|
||||
}
|
||||
|
||||
state.Phase = (state.Phase + 1) % 3;
|
||||
}
|
||||
break;
|
||||
default:
|
||||
throw new ArgumentOutOfRangeException();
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,14 @@
|
|||
using Ryujinx.Common.Memory;
|
||||
|
||||
namespace Ryujinx.Audio.Renderer.Server.Upsampler
|
||||
{
|
||||
public struct UpsamplerBufferState
|
||||
{
|
||||
public const int HistoryLength = 20;
|
||||
|
||||
public float Scale;
|
||||
public Array20<float> History;
|
||||
public bool Initialized;
|
||||
public int Phase;
|
||||
}
|
||||
}
|
||||
|
|
@ -37,6 +37,11 @@ namespace Ryujinx.Audio.Renderer.Server.Upsampler
|
|||
/// </summary>
|
||||
public ushort[] InputBufferIndices;
|
||||
|
||||
/// <summary>
|
||||
/// State of each input buffer index kept across invocations of the upsampler.
|
||||
/// </summary>
|
||||
public UpsamplerBufferState[] BufferStates;
|
||||
|
||||
/// <summary>
|
||||
/// Create a new <see cref="UpsamplerState"/>.
|
||||
/// </summary>
|
||||
|
|
|
|||
Loading…
Reference in a new issue