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
23 namespace juce
24 {
25
MixerAudioSource()26 MixerAudioSource::MixerAudioSource()
27 : currentSampleRate (0.0), bufferSizeExpected (0)
28 {
29 }
30
~MixerAudioSource()31 MixerAudioSource::~MixerAudioSource()
32 {
33 removeAllInputs();
34 }
35
36 //==============================================================================
addInputSource(AudioSource * input,const bool deleteWhenRemoved)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
removeInputSource(AudioSource * const input)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
removeAllInputs()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
prepareToPlay(int samplesPerBlockExpected,double sampleRate)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
releaseResources()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
getNextAudioBlock(const AudioSourceChannelInfo & info)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
159