OpenShot Audio Library | OpenShotAudio: juce_MemoryAudioSource.cpp Source File

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juce_MemoryAudioSource.cpp
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
23namespace juce
24{
25
26MemoryAudioSource::MemoryAudioSource (AudioBuffer<float>& bufferToUse, bool copyMemory, bool shouldLoop)
27 : isCurrentlyLooping (shouldLoop)
28{
29 if (copyMemory)
30 buffer.makeCopyOf (bufferToUse);
31 else
32 buffer.setDataToReferTo (bufferToUse.getArrayOfWritePointers(),
33 bufferToUse.getNumChannels(),
34 bufferToUse.getNumSamples());
35}
36
37//==============================================================================
38 void MemoryAudioSource::prepareToPlay (int /*samplesPerBlockExpected*/, double /*sampleRate*/)
39{
40 position = 0;
41}
42
43 void MemoryAudioSource::releaseResources() {}
44
45 void MemoryAudioSource::getNextAudioBlock (const AudioSourceChannelInfo& bufferToFill)
46{
47 if (buffer.getNumSamples() == 0)
48 {
49 bufferToFill.clearActiveBufferRegion();
50 return;
51 }
52
53 auto& dst = *bufferToFill.buffer;
54 auto channels = jmin (dst.getNumChannels(), buffer.getNumChannels());
55 int max = 0, pos = 0;
56 auto n = buffer.getNumSamples();
57 auto m = bufferToFill.numSamples;
58
59 int i = position;
60 for (; (i < n || isCurrentlyLooping) && (pos < m); i += max)
61 {
62 max = jmin (m - pos, n - (i % n));
63
64 int ch = 0;
65 for (; ch < channels; ++ch)
66 dst.copyFrom (ch, bufferToFill.startSample + pos, buffer, ch, i % n, max);
67
68 for (; ch < dst.getNumChannels(); ++ch)
69 dst.clear (ch, bufferToFill.startSample + pos, max);
70
71 pos += max;
72 }
73
74 if (pos < m)
75 dst.clear (bufferToFill.startSample + pos, m - pos);
76
77 position = i;
78}
79
80//==============================================================================
81 void MemoryAudioSource::setNextReadPosition (int64 newPosition)
82{
83 position = (int) newPosition;
84}
85
86int64 MemoryAudioSource::getNextReadPosition() const
87{
88 return position;
89}
90
91int64 MemoryAudioSource::getTotalLength() const
92{
93 return buffer.getNumSamples();
94}
95
96//==============================================================================
97 bool MemoryAudioSource::isLooping() const
98{
99 return isCurrentlyLooping;
100}
101
102 void MemoryAudioSource::setLooping (bool shouldLoop)
103{
104 isCurrentlyLooping = shouldLoop;
105}
106
107//==============================================================================
108//==============================================================================
109#if JUCE_UNIT_TESTS
110
111struct MemoryAudioSourceTests final : public UnitTest
112{
113 MemoryAudioSourceTests() : UnitTest ("MemoryAudioSource", UnitTestCategories::audio) {}
114
115 void runTest() override
116 {
117 constexpr int blockSize = 512;
118 AudioBuffer<float> bufferToFill { 2, blockSize };
119 AudioSourceChannelInfo channelInfo { bufferToFill };
120
121 beginTest ("A zero-length buffer produces silence, whether or not looping is enabled");
122 {
123 for (const bool enableLooping : { false, true })
124 {
125 AudioBuffer<float> buffer;
126 MemoryAudioSource source { buffer, true, false };
127 source.setLooping (enableLooping);
128 source.prepareToPlay (blockSize, 44100.0);
129
130 for (int i = 0; i < 2; ++i)
131 {
132 play (source, channelInfo);
133 expect (isSilent (bufferToFill));
134 }
135 }
136 }
137
138 beginTest ("A short buffer without looping is played once and followed by silence");
139 {
140 auto buffer = getShortBuffer();
141 MemoryAudioSource source { buffer, true, false };
142 source.setLooping (false);
143 source.prepareToPlay (blockSize, 44100.0);
144
145 play (source, channelInfo);
146
147 auto copy = buffer;
148 copy.setSize (buffer.getNumChannels(), blockSize, true, true, false);
149
150 expect (bufferToFill == copy);
151
152 play (source, channelInfo);
153
154 expect (isSilent (bufferToFill));
155 }
156
157 beginTest ("A short buffer with looping is played multiple times");
158 {
159 auto buffer = getShortBuffer();
160 MemoryAudioSource source { buffer, true, false };
161 source.setLooping (true);
162 source.prepareToPlay (blockSize, 44100.0);
163
164 play (source, channelInfo);
165
166 for (int sample = 0; sample < buffer.getNumSamples(); ++sample)
167 expectEquals (bufferToFill.getSample (0, sample + buffer.getNumSamples()), buffer.getSample (0, sample));
168
169 expect (! isSilent (bufferToFill));
170 }
171
172 beginTest ("A long buffer without looping is played once");
173 {
174 auto buffer = getLongBuffer();
175 MemoryAudioSource source { buffer, true, false };
176 source.setLooping (false);
177 source.prepareToPlay (blockSize, 44100.0);
178
179 play (source, channelInfo);
180
181 auto copy = buffer;
182 copy.setSize (buffer.getNumChannels(), blockSize, true, true, false);
183
184 expect (bufferToFill == copy);
185
186 for (int i = 0; i < 10; ++i)
187 play (source, channelInfo);
188
189 expect (isSilent (bufferToFill));
190 }
191
192 beginTest ("A long buffer with looping is played multiple times");
193 {
194 auto buffer = getLongBuffer();
195 MemoryAudioSource source { buffer, true, false };
196 source.setLooping (true);
197 source.prepareToPlay (blockSize, 44100.0);
198
199 for (int i = 0; i < 100; ++i)
200 {
201 play (source, channelInfo);
202 expectEquals (bufferToFill.getSample (0, 0), buffer.getSample (0, (i * blockSize) % buffer.getNumSamples()));
203 }
204 }
205 }
206
207 static AudioBuffer<float> getTestBuffer (int length)
208 {
209 AudioBuffer<float> buffer { 2, length };
210
211 for (int channel = 0; channel < buffer.getNumChannels(); ++channel)
212 for (int sample = 0; sample < buffer.getNumSamples(); ++sample)
213 buffer.setSample (channel, sample, jmap ((float) sample, 0.0f, (float) length, -1.0f, 1.0f));
214
215 return buffer;
216 }
217
218 static AudioBuffer<float> getShortBuffer() { return getTestBuffer (5); }
219 static AudioBuffer<float> getLongBuffer() { return getTestBuffer (1000); }
220
221 static void play (MemoryAudioSource& source, AudioSourceChannelInfo& info)
222 {
223 info.clearActiveBufferRegion();
224 source.getNextAudioBlock (info);
225 }
226
227 static bool isSilent (const AudioBuffer<float>& b)
228 {
229 for (int channel = 0; channel < b.getNumChannels(); ++channel)
230 if (b.findMinMax (channel, 0, b.getNumSamples()) != Range<float>{})
231 return false;
232
233 return true;
234 }
235};
236
237static MemoryAudioSourceTests memoryAudioSourceTests;
238
239#endif
240
241} // namespace juce
juce::AudioBuffer
Definition juce_AudioSampleBuffer.h:34
juce::AudioBuffer::getNumChannels
int getNumChannels() const noexcept
Definition juce_AudioSampleBuffer.h:236
juce::AudioBuffer::getNumSamples
int getNumSamples() const noexcept
Definition juce_AudioSampleBuffer.h:242
juce::AudioBuffer::getArrayOfWritePointers
Type *const * getArrayOfWritePointers() noexcept
Definition juce_AudioSampleBuffer.h:342
juce::MemoryAudioSource::isLooping
bool isLooping() const override
Definition juce_MemoryAudioSource.cpp:97
juce::MemoryAudioSource::getNextReadPosition
int64 getNextReadPosition() const override
Definition juce_MemoryAudioSource.cpp:86
juce::MemoryAudioSource::MemoryAudioSource
MemoryAudioSource(AudioBuffer< float > &audioBuffer, bool copyMemory, bool shouldLoop=false)
Definition juce_MemoryAudioSource.cpp:26
juce::MemoryAudioSource::setNextReadPosition
void setNextReadPosition(int64 newPosition) override
Definition juce_MemoryAudioSource.cpp:81
juce::MemoryAudioSource::getTotalLength
int64 getTotalLength() const override
Definition juce_MemoryAudioSource.cpp:91
juce::MemoryAudioSource::prepareToPlay
void prepareToPlay(int samplesPerBlockExpected, double sampleRate) override
Definition juce_MemoryAudioSource.cpp:38
juce::MemoryAudioSource::setLooping
void setLooping(bool shouldLoop) override
Definition juce_MemoryAudioSource.cpp:102
juce::MemoryAudioSource::getNextAudioBlock
void getNextAudioBlock(const AudioSourceChannelInfo &bufferToFill) override
Definition juce_MemoryAudioSource.cpp:45
juce::MemoryAudioSource::releaseResources
void releaseResources() override
Definition juce_MemoryAudioSource.cpp:43
juce::UnitTest
Definition juce_UnitTest.h:70
juce::AudioSourceChannelInfo
Definition juce_AudioSource.h:33
juce::AudioSourceChannelInfo::numSamples
int numSamples
Definition juce_AudioSource.h:81
juce::AudioSourceChannelInfo::clearActiveBufferRegion
void clearActiveBufferRegion() const
Definition juce_AudioSource.h:84
juce::AudioSourceChannelInfo::buffer
AudioBuffer< float > * buffer
Definition juce_AudioSource.h:73
juce::AudioSourceChannelInfo::startSample
int startSample
Definition juce_AudioSource.h:77