OpenShot Audio Library | OpenShotAudio: juce_MixerAudioSource.cpp Source File

OpenShot Audio Library | OpenShotAudio 0.4.0

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juce_MixerAudioSource.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
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:367
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::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:784
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
BigInteger & shiftBits(int howManyBitsLeft, int startBit)
Definition juce_BigInteger.cpp:873
juce::BigInteger::setBit
BigInteger & setBit(int bitNumber)
Definition juce_BigInteger.cpp:294
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:50
juce::OwnedArray::size
int size() const noexcept
Definition juce_OwnedArray.h:129
juce::OwnedArray::getUnchecked
ObjectClass * getUnchecked(int index) const noexcept
Definition juce_OwnedArray.h:159
juce::OwnedArray::add
ObjectClass * add(ObjectClass *newObject)
Definition juce_OwnedArray.h:293
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