mirror of
https://github.com/Ryujinx/Ryujinx.git
synced 2024-08-14 20:58:42 +02:00
* audio: Cleanup SoundIO and fix OpenAL issue * fix tabs by spaces * Fix extra spaces * Fix SoundIO.cs * Fix ContainsAudioOutBuffer
126 lines
4.7 KiB
C#
126 lines
4.7 KiB
C#
using System;
|
|
using System.Runtime.CompilerServices;
|
|
using System.Runtime.InteropServices;
|
|
|
|
namespace Ryujinx.Audio
|
|
{
|
|
public static class Downmixing
|
|
{
|
|
[StructLayout(LayoutKind.Sequential, Pack = 1)]
|
|
private struct Channel51FormatPCM16
|
|
{
|
|
public short FrontLeft;
|
|
public short FrontRight;
|
|
public short FrontCenter;
|
|
public short LowFrequency;
|
|
public short BackLeft;
|
|
public short BackRight;
|
|
}
|
|
|
|
[StructLayout(LayoutKind.Sequential, Pack = 1)]
|
|
private struct ChannelStereoFormatPCM16
|
|
{
|
|
public short Left;
|
|
public short Right;
|
|
}
|
|
|
|
private const int Q15Bits = 16;
|
|
private const int RawQ15One = 1 << Q15Bits;
|
|
private const int RawQ15HalfOne = (int)(0.5f * RawQ15One);
|
|
private const int Minus3dBInQ15 = (int)(0.707f * RawQ15One);
|
|
private const int Minus6dBInQ15 = (int)(0.501f * RawQ15One);
|
|
private const int Minus12dBInQ15 = (int)(0.251f * RawQ15One);
|
|
|
|
private static readonly int[] DefaultSurroundToStereoCoefficients = new int[4]
|
|
{
|
|
RawQ15One,
|
|
Minus3dBInQ15,
|
|
Minus12dBInQ15,
|
|
Minus3dBInQ15
|
|
};
|
|
|
|
private static readonly int[] DefaultStereoToMonoCoefficients = new int[2]
|
|
{
|
|
Minus6dBInQ15,
|
|
Minus6dBInQ15
|
|
};
|
|
|
|
private const int SurroundChannelCount = 6;
|
|
private const int StereoChannelCount = 2;
|
|
private const int MonoChannelCount = 1;
|
|
|
|
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
|
private static ReadOnlySpan<Channel51FormatPCM16> GetSurroundBuffer(ReadOnlySpan<short> data)
|
|
{
|
|
return MemoryMarshal.Cast<short, Channel51FormatPCM16>(data);
|
|
}
|
|
|
|
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
|
private static ReadOnlySpan<ChannelStereoFormatPCM16> GetStereoBuffer(ReadOnlySpan<short> data)
|
|
{
|
|
return MemoryMarshal.Cast<short, ChannelStereoFormatPCM16>(data);
|
|
}
|
|
|
|
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
|
private static short DownMixStereoToMono(ReadOnlySpan<int> coefficients, short left, short right)
|
|
{
|
|
return (short)((left * coefficients[0] + right * coefficients[1]) >> Q15Bits);
|
|
}
|
|
|
|
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
|
private static short DownMixSurroundToStereo(ReadOnlySpan<int> coefficients, short back, short lfe, short center, short front)
|
|
{
|
|
return (short)((coefficients[3] * back + coefficients[2] * lfe + coefficients[1] * center + coefficients[0] * front + RawQ15HalfOne) >> Q15Bits);
|
|
}
|
|
|
|
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
|
private static short[] DownMixSurroundToStereo(ReadOnlySpan<int> coefficients, ReadOnlySpan<short> data)
|
|
{
|
|
int samplePerChannelCount = data.Length / SurroundChannelCount;
|
|
|
|
short[] downmixedBuffer = new short[samplePerChannelCount * StereoChannelCount];
|
|
|
|
ReadOnlySpan<Channel51FormatPCM16> channels = GetSurroundBuffer(data);
|
|
|
|
for (int i = 0; i < samplePerChannelCount; i++)
|
|
{
|
|
Channel51FormatPCM16 channel = channels[i];
|
|
|
|
downmixedBuffer[i * 2] = DownMixSurroundToStereo(coefficients, channel.BackLeft, channel.LowFrequency, channel.FrontCenter, channel.FrontLeft);
|
|
downmixedBuffer[i * 2 + 1] = DownMixSurroundToStereo(coefficients, channel.BackRight, channel.LowFrequency, channel.FrontCenter, channel.FrontRight);
|
|
}
|
|
|
|
return downmixedBuffer;
|
|
}
|
|
|
|
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
|
private static short[] DownMixStereoToMono(ReadOnlySpan<int> coefficients, ReadOnlySpan<short> data)
|
|
{
|
|
int samplePerChannelCount = data.Length / StereoChannelCount;
|
|
|
|
short[] downmixedBuffer = new short[samplePerChannelCount * MonoChannelCount];
|
|
|
|
ReadOnlySpan<ChannelStereoFormatPCM16> channels = GetStereoBuffer(data);
|
|
|
|
for (int i = 0; i < samplePerChannelCount; i++)
|
|
{
|
|
ChannelStereoFormatPCM16 channel = channels[i];
|
|
|
|
downmixedBuffer[i] = DownMixStereoToMono(coefficients, channel.Left, channel.Right);
|
|
}
|
|
|
|
return downmixedBuffer;
|
|
}
|
|
|
|
public static short[] DownMixStereoToMono(ReadOnlySpan<short> data)
|
|
{
|
|
return DownMixStereoToMono(DefaultStereoToMonoCoefficients, data);
|
|
}
|
|
|
|
public static short[] DownMixSurroundToStereo(ReadOnlySpan<short> data)
|
|
{
|
|
return DownMixSurroundToStereo(DefaultSurroundToStereoCoefficients, data);
|
|
}
|
|
}
|
|
}
|