mirror of
https://github.com/Ryujinx/Ryujinx.git
synced 2024-08-21 08:08:47 +02:00
130 lines
4.3 KiB
C#
130 lines
4.3 KiB
C#
using System;
|
|
using System.Numerics;
|
|
using System.Runtime.CompilerServices;
|
|
|
|
namespace Ryujinx.Audio.Renderer.Dsp
|
|
{
|
|
public static class PcmHelper
|
|
{
|
|
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
|
public static int GetCountToDecode(int startSampleOffset, int endSampleOffset, int offset, int count)
|
|
{
|
|
return Math.Min(count, endSampleOffset - startSampleOffset - offset);
|
|
}
|
|
|
|
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
|
public static ulong GetBufferOffset<T>(int startSampleOffset, int offset, int channelCount) where T : unmanaged
|
|
{
|
|
return (ulong)(Unsafe.SizeOf<T>() * channelCount * (startSampleOffset + offset));
|
|
}
|
|
|
|
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
|
public static int GetBufferSize<T>(int startSampleOffset, int endSampleOffset, int offset, int count) where T : unmanaged
|
|
{
|
|
return GetCountToDecode(startSampleOffset, endSampleOffset, offset, count) * Unsafe.SizeOf<T>();
|
|
}
|
|
|
|
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
|
public static float ConvertSampleToPcmFloat(short sample)
|
|
{
|
|
return (float)sample / short.MaxValue;
|
|
}
|
|
|
|
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
|
public static short ConvertSampleToPcmInt16(float sample)
|
|
{
|
|
return Saturate(sample * short.MaxValue);
|
|
}
|
|
|
|
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
|
public static void ConvertSampleToPcm8(Span<sbyte> output, ReadOnlySpan<short> input)
|
|
{
|
|
for (int i = 0; i < input.Length; i++)
|
|
{
|
|
// Output most significant byte
|
|
output[i] = (sbyte)(input[i] >> 8);
|
|
}
|
|
}
|
|
|
|
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
|
public static void ConvertSampleToPcm24(Span<byte> output, ReadOnlySpan<short> input)
|
|
{
|
|
for (int i = 0; i < input.Length; i++)
|
|
{
|
|
output[i * 3 + 2] = (byte)(input[i] >> 8);
|
|
output[i * 3 + 1] = (byte)(input[i] & 0xff);
|
|
output[i * 3 + 0] = 0;
|
|
}
|
|
}
|
|
|
|
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
|
public static void ConvertSampleToPcm32(Span<int> output, ReadOnlySpan<short> input)
|
|
{
|
|
for (int i = 0; i < input.Length; i++)
|
|
{
|
|
output[i] = ((int)input[i]) << 16;
|
|
}
|
|
}
|
|
|
|
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
|
public static void ConvertSampleToPcmFloat(Span<float> output, ReadOnlySpan<short> input)
|
|
{
|
|
for (int i = 0; i < input.Length; i++)
|
|
{
|
|
output[i] = ConvertSampleToPcmFloat(input[i]);
|
|
}
|
|
}
|
|
|
|
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
|
public static int Decode(Span<short> output, ReadOnlySpan<short> input, int startSampleOffset, int endSampleOffset, int channelIndex, int channelCount)
|
|
{
|
|
if (input.IsEmpty || endSampleOffset < startSampleOffset)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
int decodedCount = input.Length / channelCount;
|
|
|
|
for (int i = 0; i < decodedCount; i++)
|
|
{
|
|
output[i] = input[i * channelCount + channelIndex];
|
|
}
|
|
|
|
return decodedCount;
|
|
}
|
|
|
|
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
|
public static int Decode(Span<short> output, ReadOnlySpan<float> input, int startSampleOffset, int endSampleOffset, int channelIndex, int channelCount)
|
|
{
|
|
if (input.IsEmpty || endSampleOffset < startSampleOffset)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
int decodedCount = input.Length / channelCount;
|
|
|
|
for (int i = 0; i < decodedCount; i++)
|
|
{
|
|
output[i] = ConvertSampleToPcmInt16(input[i * channelCount + channelIndex]);
|
|
}
|
|
|
|
return decodedCount;
|
|
}
|
|
|
|
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
|
public static short Saturate(float value)
|
|
{
|
|
if (value > short.MaxValue)
|
|
{
|
|
return short.MaxValue;
|
|
}
|
|
|
|
if (value < short.MinValue)
|
|
{
|
|
return short.MinValue;
|
|
}
|
|
|
|
return (short)value;
|
|
}
|
|
}
|
|
} |