OpenShot Audio Library | OpenShotAudio: juce_MixerAudioSource.cpp Source File

OpenShot Audio Library | OpenShotAudio 0.3.0

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juce_MixerAudioSource.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
26MixerAudioSource::MixerAudioSource()
27 : currentSampleRate (0.0), bufferSizeExpected (0)
28{
29}
30
31MixerAudioSource::~MixerAudioSource()
32{
33 removeAllInputs();
34}
35
36//==============================================================================
37 void MixerAudioSource::addInputSource (AudioSource* input, const bool deleteWhenRemoved)
38{
39 if (input != nullptr && ! inputs.contains (input))
40 {
41 double localRate;
42 int localBufferSize;
43
44 {
45 const ScopedLock sl (lock);
46 localRate = currentSampleRate;
47 localBufferSize = bufferSizeExpected;
48 }
49
50 if (localRate > 0.0)
51 input->prepareToPlay (localBufferSize, localRate);
52
53 const ScopedLock sl (lock);
54
55 inputsToDelete.setBit (inputs.size(), deleteWhenRemoved);
56 inputs.add (input);
57 }
58}
59
60 void MixerAudioSource::removeInputSource (AudioSource* const input)
61{
62 if (input != nullptr)
63 {
64 std::unique_ptr<AudioSource> toDelete;
65
66 {
67 const ScopedLock sl (lock);
68 const int index = inputs.indexOf (input);
69
70 if (index < 0)
71 return;
72
73 if (inputsToDelete [index])
74 toDelete.reset (input);
75
76 inputsToDelete.shiftBits (-1, index);
77 inputs.remove (index);
78 }
79
80 input->releaseResources();
81 }
82}
83
84 void MixerAudioSource::removeAllInputs()
85{
86 OwnedArray<AudioSource> toDelete;
87
88 {
89 const ScopedLock sl (lock);
90
91 for (int i = inputs.size(); --i >= 0;)
92 if (inputsToDelete[i])
93 toDelete.add (inputs.getUnchecked(i));
94
95 inputs.clear();
96 }
97
98 for (int i = toDelete.size(); --i >= 0;)
99 toDelete.getUnchecked(i)->releaseResources();
100}
101
102 void MixerAudioSource::prepareToPlay (int samplesPerBlockExpected, double sampleRate)
103{
104 tempBuffer.setSize (2, samplesPerBlockExpected);
105
106 const ScopedLock sl (lock);
107
108 currentSampleRate = sampleRate;
109 bufferSizeExpected = samplesPerBlockExpected;
110
111 for (int i = inputs.size(); --i >= 0;)
112 inputs.getUnchecked(i)->prepareToPlay (samplesPerBlockExpected, sampleRate);
113}
114
115 void MixerAudioSource::releaseResources()
116{
117 const ScopedLock sl (lock);
118
119 for (int i = inputs.size(); --i >= 0;)
120 inputs.getUnchecked(i)->releaseResources();
121
122 tempBuffer.setSize (2, 0);
123
124 currentSampleRate = 0;
125 bufferSizeExpected = 0;
126}
127
128 void MixerAudioSource::getNextAudioBlock (const AudioSourceChannelInfo& info)
129{
130 const ScopedLock sl (lock);
131
132 if (inputs.size() > 0)
133 {
134 inputs.getUnchecked(0)->getNextAudioBlock (info);
135
136 if (inputs.size() > 1)
137 {
138 tempBuffer.setSize (jmax (1, info.buffer->getNumChannels()),
139 info.buffer->getNumSamples());
140
141 AudioSourceChannelInfo info2 (&tempBuffer, 0, info.numSamples);
142
143 for (int i = 1; i < inputs.size(); ++i)
144 {
145 inputs.getUnchecked(i)->getNextAudioBlock (info2);
146
147 for (int chan = 0; chan < info.buffer->getNumChannels(); ++chan)
148 info.buffer->addFrom (chan, info.startSample, tempBuffer, chan, 0, info.numSamples);
149 }
150 }
151 }
152 else
153 {
154 info.clearActiveBufferRegion();
155 }
156}
157
158} // namespace juce
juce::AudioBuffer::setSize
void setSize(int newNumChannels, int newNumSamples, bool keepExistingContent=false, bool clearExtraSpace=false, bool avoidReallocating=false)
Definition: juce_AudioSampleBuffer.h:331
juce::AudioBuffer::getNumChannels
int getNumChannels() const noexcept
Definition: juce_AudioSampleBuffer.h:233
juce::AudioBuffer::getNumSamples
int getNumSamples() const noexcept
Definition: juce_AudioSampleBuffer.h:238
juce::AudioBuffer::addFrom
void addFrom(int destChannel, int destStartSample, const AudioBuffer &source, int sourceChannel, int sourceStartSample, int numSamples, Type gainToApplyToSource=Type(1)) noexcept
Definition: juce_AudioSampleBuffer.h:699
juce::AudioSource
Definition: juce_AudioSource.h:110
juce::AudioSource::releaseResources
virtual void releaseResources()=0
juce::AudioSource::prepareToPlay
virtual void prepareToPlay(int samplesPerBlockExpected, double sampleRate)=0
juce::BigInteger::shiftBits
void shiftBits(int howManyBitsLeft, int startBit)
Definition: juce_BigInteger.cpp:862
juce::BigInteger::setBit
void setBit(int bitNumber)
Definition: juce_BigInteger.cpp:292
juce::GenericScopedLock
Definition: juce_ScopedLock.h:55
juce::MixerAudioSource::removeInputSource
void removeInputSource(AudioSource *input)
Definition: juce_MixerAudioSource.cpp:60
juce::MixerAudioSource::getNextAudioBlock
void getNextAudioBlock(const AudioSourceChannelInfo &) override
Definition: juce_MixerAudioSource.cpp:128
juce::MixerAudioSource::MixerAudioSource
MixerAudioSource()
Definition: juce_MixerAudioSource.cpp:26
juce::MixerAudioSource::removeAllInputs
void removeAllInputs()
Definition: juce_MixerAudioSource.cpp:84
juce::MixerAudioSource::addInputSource
void addInputSource(AudioSource *newInput, bool deleteWhenRemoved)
Definition: juce_MixerAudioSource.cpp:37
juce::MixerAudioSource::prepareToPlay
void prepareToPlay(int samplesPerBlockExpected, double sampleRate) override
Definition: juce_MixerAudioSource.cpp:102
juce::MixerAudioSource::~MixerAudioSource
~MixerAudioSource() override
Definition: juce_MixerAudioSource.cpp:31
juce::MixerAudioSource::releaseResources
void releaseResources() override
Definition: juce_MixerAudioSource.cpp:115
juce::OwnedArray
Definition: juce_OwnedArray.h:51
juce::OwnedArray::size
int size() const noexcept
Definition: juce_OwnedArray.h:130
juce::OwnedArray::getUnchecked
ObjectClass * getUnchecked(int index) const noexcept
Definition: juce_OwnedArray.h:160
juce::OwnedArray::add
ObjectClass * add(ObjectClass *newObject)
Definition: juce_OwnedArray.h:294
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