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using Ryujinx.Common;
using Ryujinx.Common.Memory;
using System;
using System.Buffers;
namespace Ryujinx.Audio.Backends.Common
{
/// <summary>
/// A ring buffer that grow if data written to it is too big to fit.
/// </summary>
public class DynamicRingBuffer
{
private const int RingBufferAlignment = 2048;
private readonly object _lock = new();
private IMemoryOwner<byte> _bufferOwner;
private Memory<byte> _buffer;
private int _size;
private int _headOffset;
private int _tailOffset;
public int Length => _size;
public DynamicRingBuffer(int initialCapacity = RingBufferAlignment)
{
_bufferOwner = ByteMemoryPool.RentCleared(initialCapacity);
_buffer = _bufferOwner.Memory;
}
public void Clear()
{
_size = 0;
_headOffset = 0;
_tailOffset = 0;
}
public void Clear(int size)
{
if (size == 0)
{
return;
}
lock (_lock)
{
if (size > _size)
{
size = _size;
}
_headOffset = (_headOffset + size) % _buffer.Length;
_size -= size;
if (_size == 0)
{
_headOffset = 0;
_tailOffset = 0;
}
}
}
private void SetCapacityLocked(int capacity)
{
IMemoryOwner<byte> newBufferOwner = ByteMemoryPool.RentCleared(capacity);
Memory<byte> newBuffer = newBufferOwner.Memory;
if (_size > 0)
{
if (_headOffset < _tailOffset)
{
_buffer.Slice(_headOffset, _size).CopyTo(newBuffer);
}
else
{
_buffer[_headOffset..].CopyTo(newBuffer);
_buffer[.._tailOffset].CopyTo(newBuffer[(_buffer.Length - _headOffset)..]);
}
}
_bufferOwner.Dispose();
_bufferOwner = newBufferOwner;
_buffer = newBuffer;
_headOffset = 0;
_tailOffset = _size;
}
public void Write(ReadOnlySpan<byte> buffer, int index, int count)
{
if (count == 0)
{
return;
}
lock (_lock)
{
if ((_size + count) > _buffer.Length)
{
SetCapacityLocked(BitUtils.AlignUp(_size + count, RingBufferAlignment));
}
if (_headOffset < _tailOffset)
{
int tailLength = _buffer.Length - _tailOffset;
if (tailLength >= count)
{
buffer.Slice(index, count).CopyTo(_buffer.Span[_tailOffset..]);
}
else
{
buffer.Slice(index, tailLength).CopyTo(_buffer.Span[_tailOffset..]);
buffer.Slice(index + tailLength, count - tailLength).CopyTo(_buffer.Span);
}
}
else
{
buffer.Slice(index, count).CopyTo(_buffer.Span[_tailOffset..]);
}
_size += count;
_tailOffset = (_tailOffset + count) % _buffer.Length;
}
}
public int Read(Span<byte> buffer, int index, int count)
{
if (count == 0)
{
return 0;
}
lock (_lock)
{
if (count > _size)
{
count = _size;
}
if (_headOffset < _tailOffset)
{
_buffer.Span.Slice(_headOffset, count).CopyTo(buffer[index..]);
}
else
{
int tailLength = _buffer.Length - _headOffset;
if (tailLength >= count)
{
_buffer.Span.Slice(_headOffset, count).CopyTo(buffer[index..]);
}
else
{
_buffer.Span.Slice(_headOffset, tailLength).CopyTo(buffer[index..]);
_buffer.Span[..(count - tailLength)].CopyTo(buffer[(index + tailLength)..]);
}
}
_size -= count;
_headOffset = (_headOffset + count) % _buffer.Length;
if (_size == 0)
{
_headOffset = 0;
_tailOffset = 0;
}
return count;
}
}
}
}
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