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juce_SingleThreadedAbstractFifo.h
1/*
2 ==============================================================================
3
4 This file is part of the JUCE library.
5 Copyright (c) 2022 - Raw Material Software Limited
6
7 JUCE is an open source library subject to commercial or open-source
8 licensing.
9
10 The code included in this file is provided under the terms of the ISC license
11 http://www.isc.org/downloads/software-support-policy/isc-license. Permission
12 To use, copy, modify, and/or distribute this software for any purpose with or
13 without fee is hereby granted provided that the above copyright notice and
14 this permission notice appear in all copies.
15
16 JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
17 EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
18 DISCLAIMED.
19
20 ==============================================================================
21*/
22
23 namespace juce
24{
25
26//==============================================================================
63 class SingleThreadedAbstractFifo
64{
65 public:
67 SingleThreadedAbstractFifo() = default;
68
70 explicit SingleThreadedAbstractFifo (int sizeIn)
71 : size (sizeIn)
72 {
73 // This class only works properly when the size is a power of two.
74 // Use nextPowerOfTwo() to find a good size, and ensure that your
75 // backing storage is the same size.
76 jassert (isPowerOfTwo (sizeIn));
77 }
78
80 int getRemainingSpace() const { return size - numReadable; }
81
83 int getNumReadable() const { return numReadable; }
84
86 int getSize() const { return size; }
87
93 std::array<Range<int>, 2> write (int num)
94 {
95 const auto startPos = (readPos + numReadable) & (size - 1);
96 const auto maxToWrite = jmin (getRemainingSpace(), num);
97 const auto firstBlockSize = jmin (maxToWrite, size - startPos);
98
99 numReadable += maxToWrite;
100
101 return { { { startPos, startPos + firstBlockSize }, { 0, maxToWrite - firstBlockSize } } };
102 }
103
109 std::array<Range<int>, 2> read (int num)
110 {
111 const auto startPos = readPos;
112 const auto maxToRead = jmin (numReadable, num);
113 const auto firstBlockSize = jmin (maxToRead, size - startPos);
114
115 readPos = (startPos + maxToRead) & (size - 1);
116 numReadable -= maxToRead;
117
118 return { { { startPos, startPos + firstBlockSize }, { 0, maxToRead - firstBlockSize } } };
119 }
120
121 private:
122 int size = 0, readPos = 0, numReadable = 0;
123};
124
125
126} // namespace juce
juce::SingleThreadedAbstractFifo
Definition juce_SingleThreadedAbstractFifo.h:64
juce::SingleThreadedAbstractFifo::SingleThreadedAbstractFifo
SingleThreadedAbstractFifo(int sizeIn)
Definition juce_SingleThreadedAbstractFifo.h:70
juce::SingleThreadedAbstractFifo::SingleThreadedAbstractFifo
SingleThreadedAbstractFifo()=default
juce::SingleThreadedAbstractFifo::getRemainingSpace
int getRemainingSpace() const
Definition juce_SingleThreadedAbstractFifo.h:80
juce::SingleThreadedAbstractFifo::read
std::array< Range< int >, 2 > read(int num)
Definition juce_SingleThreadedAbstractFifo.h:109
juce::SingleThreadedAbstractFifo::getSize
int getSize() const
Definition juce_SingleThreadedAbstractFifo.h:86
juce::SingleThreadedAbstractFifo::write
std::array< Range< int >, 2 > write(int num)
Definition juce_SingleThreadedAbstractFifo.h:93
juce::SingleThreadedAbstractFifo::getNumReadable
int getNumReadable() const
Definition juce_SingleThreadedAbstractFifo.h:83