OpenShot Audio Library | OpenShotAudio: juce_SubregionStream.cpp Source File

OpenShot Audio Library | OpenShotAudio 0.3.1

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juce_SubregionStream.cpp
1/*
2 ==============================================================================
3
4 This file is part of the JUCE library.
5 Copyright (c) 2017 - ROLI Ltd.
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
23namespace juce
24{
25
26SubregionStream::SubregionStream (InputStream* sourceStream,
27 int64 start, int64 length,
28 bool deleteSourceWhenDestroyed)
29 : source (sourceStream, deleteSourceWhenDestroyed),
30 startPositionInSourceStream (start),
31 lengthOfSourceStream (length)
32{
33 SubregionStream::setPosition (0);
34}
35
36SubregionStream::~SubregionStream()
37{
38}
39
40int64 SubregionStream::getTotalLength()
41{
42 auto srcLen = source->getTotalLength() - startPositionInSourceStream;
43
44 return lengthOfSourceStream >= 0 ? jmin (lengthOfSourceStream, srcLen)
45 : srcLen;
46}
47
48int64 SubregionStream::getPosition()
49{
50 return source->getPosition() - startPositionInSourceStream;
51}
52
53 bool SubregionStream::setPosition (int64 newPosition)
54{
55 return source->setPosition (jmax ((int64) 0, newPosition + startPositionInSourceStream));
56}
57
58 int SubregionStream::read (void* destBuffer, int maxBytesToRead)
59{
60 jassert (destBuffer != nullptr && maxBytesToRead >= 0);
61
62 if (lengthOfSourceStream < 0)
63 return source->read (destBuffer, maxBytesToRead);
64
65 maxBytesToRead = (int) jmin ((int64) maxBytesToRead, lengthOfSourceStream - getPosition());
66
67 if (maxBytesToRead <= 0)
68 return 0;
69
70 return source->read (destBuffer, maxBytesToRead);
71}
72
73 bool SubregionStream::isExhausted()
74{
75 if (lengthOfSourceStream >= 0 && getPosition() >= lengthOfSourceStream)
76 return true;
77
78 return source->isExhausted();
79}
80
81
82//==============================================================================
83//==============================================================================
84#if JUCE_UNIT_TESTS
85
86struct SubregionInputStreamTests : public UnitTest
87{
88 SubregionInputStreamTests()
89 : UnitTest ("SubregionInputStream", UnitTestCategories::streams)
90 {}
91
92 void runTest() override
93 {
94 const MemoryBlock data ("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz", 52);
95 MemoryInputStream mi (data, true);
96
97 const int offset = getRandom().nextInt ((int) data.getSize());
98 const size_t subregionSize = data.getSize() - (size_t) offset;
99
100 SubregionStream stream (&mi, offset, (int) subregionSize, false);
101
102 beginTest ("Read");
103
104 expectEquals (stream.getPosition(), (int64) 0);
105 expectEquals (stream.getTotalLength(), (int64) subregionSize);
106 expectEquals (stream.getNumBytesRemaining(), stream.getTotalLength());
107 expect (! stream.isExhausted());
108
109 size_t numBytesRead = 0;
110 MemoryBlock readBuffer (subregionSize);
111
112 while (numBytesRead < subregionSize)
113 {
114 numBytesRead += (size_t) stream.read (&readBuffer[numBytesRead], 3);
115
116 expectEquals (stream.getPosition(), (int64) numBytesRead);
117 expectEquals (stream.getNumBytesRemaining(), (int64) (subregionSize - numBytesRead));
118 expect (stream.isExhausted() == (numBytesRead == subregionSize));
119 }
120
121 expectEquals (stream.getPosition(), (int64) subregionSize);
122 expectEquals (stream.getNumBytesRemaining(), (int64) 0);
123 expect (stream.isExhausted());
124
125 const MemoryBlock memoryBlockToCheck (data.begin() + (size_t) offset, data.getSize() - (size_t) offset);
126 expect (readBuffer == memoryBlockToCheck);
127
128 beginTest ("Skip");
129
130 stream.setPosition (0);
131 expectEquals (stream.getPosition(), (int64) 0);
132 expectEquals (stream.getTotalLength(), (int64) subregionSize);
133 expectEquals (stream.getNumBytesRemaining(), stream.getTotalLength());
134 expect (! stream.isExhausted());
135
136 numBytesRead = 0;
137 const int64 numBytesToSkip = 5;
138
139 while (numBytesRead < subregionSize)
140 {
141 stream.skipNextBytes (numBytesToSkip);
142 numBytesRead += numBytesToSkip;
143 numBytesRead = std::min (numBytesRead, subregionSize);
144
145 expectEquals (stream.getPosition(), (int64) numBytesRead);
146 expectEquals (stream.getNumBytesRemaining(), (int64) (subregionSize - numBytesRead));
147 expect (stream.isExhausted() == (numBytesRead == subregionSize));
148 }
149
150 expectEquals (stream.getPosition(), (int64) subregionSize);
151 expectEquals (stream.getNumBytesRemaining(), (int64) 0);
152 expect (stream.isExhausted());
153 }
154};
155
156static SubregionInputStreamTests subregionInputStreamTests;
157
158#endif
159
160} // namespace juce
juce::InputStream
Definition: juce_InputStream.h:37
juce::SubregionStream::SubregionStream
SubregionStream(InputStream *sourceStream, int64 startPositionInSourceStream, int64 lengthOfSourceStream, bool deleteSourceWhenDestroyed)
Definition: juce_SubregionStream.cpp:26
juce::SubregionStream::getPosition
int64 getPosition() override
Definition: juce_SubregionStream.cpp:48
juce::SubregionStream::setPosition
bool setPosition(int64 newPosition) override
Definition: juce_SubregionStream.cpp:53
juce::SubregionStream::isExhausted
bool isExhausted() override
Definition: juce_SubregionStream.cpp:73
juce::SubregionStream::read
int read(void *destBuffer, int maxBytesToRead) override
Definition: juce_SubregionStream.cpp:58
juce::SubregionStream::getTotalLength
int64 getTotalLength() override
Definition: juce_SubregionStream.cpp:40
juce::SubregionStream::~SubregionStream
~SubregionStream() override
Definition: juce_SubregionStream.cpp:36
juce::UnitTest
Definition: juce_UnitTest.h:70