1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
|
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 MemoryOwner<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 = MemoryOwner<byte>.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)
{
MemoryOwner<byte> newBufferOwner = MemoryOwner<byte>.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;
}
}
}
}
|
