Ryujinx/Ryujinx.Audio/Renderer/Utils/SpanMemoryManager.cs

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using System;
using System.Buffers;
using System.Runtime.InteropServices;
namespace Ryujinx.Audio.Renderer.Utils
{
public sealed unsafe class SpanMemoryManager<T> : MemoryManager<T>
where T : unmanaged
{
private readonly T* _pointer;
private readonly int _length;
public SpanMemoryManager(Span<T> span)
{
fixed (T* ptr = &MemoryMarshal.GetReference(span))
{
_pointer = ptr;
_length = span.Length;
}
}
public override Span<T> GetSpan() => new Span<T>(_pointer, _length);
public override MemoryHandle Pin(int elementIndex = 0)
{
if (elementIndex < 0 || elementIndex >= _length)
{
throw new ArgumentOutOfRangeException(nameof(elementIndex));
}
return new MemoryHandle(_pointer + elementIndex);
}
public override void Unpin() { }
protected override void Dispose(bool disposing) { }
public static Memory<T> Cast<TFrom>(Memory<TFrom> memory) where TFrom : unmanaged
{
return new SpanMemoryManager<T>(MemoryMarshal.Cast<TFrom, T>(memory.Span)).Memory;
}
}
}