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
ChannelRemappingAudioSource(AudioSource * const source_,const bool deleteSourceWhenDeleted)26 ChannelRemappingAudioSource::ChannelRemappingAudioSource (AudioSource* const source_,
27 const bool deleteSourceWhenDeleted)
28 : source (source_, deleteSourceWhenDeleted),
29 requiredNumberOfChannels (2)
30 {
31 remappedInfo.buffer = &buffer;
32 remappedInfo.startSample = 0;
33 }
34
~ChannelRemappingAudioSource()35 ChannelRemappingAudioSource::~ChannelRemappingAudioSource() {}
36
37 //==============================================================================
setNumberOfChannelsToProduce(const int requiredNumberOfChannels_)38 void ChannelRemappingAudioSource::setNumberOfChannelsToProduce (const int requiredNumberOfChannels_)
39 {
40 const ScopedLock sl (lock);
41 requiredNumberOfChannels = requiredNumberOfChannels_;
42 }
43
clearAllMappings()44 void ChannelRemappingAudioSource::clearAllMappings()
45 {
46 const ScopedLock sl (lock);
47
48 remappedInputs.clear();
49 remappedOutputs.clear();
50 }
51
setInputChannelMapping(const int destIndex,const int sourceIndex)52 void ChannelRemappingAudioSource::setInputChannelMapping (const int destIndex, const int sourceIndex)
53 {
54 const ScopedLock sl (lock);
55
56 while (remappedInputs.size() < destIndex)
57 remappedInputs.add (-1);
58
59 remappedInputs.set (destIndex, sourceIndex);
60 }
61
setOutputChannelMapping(const int sourceIndex,const int destIndex)62 void ChannelRemappingAudioSource::setOutputChannelMapping (const int sourceIndex, const int destIndex)
63 {
64 const ScopedLock sl (lock);
65
66 while (remappedOutputs.size() < sourceIndex)
67 remappedOutputs.add (-1);
68
69 remappedOutputs.set (sourceIndex, destIndex);
70 }
71
getRemappedInputChannel(const int inputChannelIndex) const72 int ChannelRemappingAudioSource::getRemappedInputChannel (const int inputChannelIndex) const
73 {
74 const ScopedLock sl (lock);
75
76 if (inputChannelIndex >= 0 && inputChannelIndex < remappedInputs.size())
77 return remappedInputs.getUnchecked (inputChannelIndex);
78
79 return -1;
80 }
81
getRemappedOutputChannel(const int outputChannelIndex) const82 int ChannelRemappingAudioSource::getRemappedOutputChannel (const int outputChannelIndex) const
83 {
84 const ScopedLock sl (lock);
85
86 if (outputChannelIndex >= 0 && outputChannelIndex < remappedOutputs.size())
87 return remappedOutputs .getUnchecked (outputChannelIndex);
88
89 return -1;
90 }
91
92 //==============================================================================
prepareToPlay(int samplesPerBlockExpected,double sampleRate)93 void ChannelRemappingAudioSource::prepareToPlay (int samplesPerBlockExpected, double sampleRate)
94 {
95 source->prepareToPlay (samplesPerBlockExpected, sampleRate);
96 }
97
releaseResources()98 void ChannelRemappingAudioSource::releaseResources()
99 {
100 source->releaseResources();
101 }
102
getNextAudioBlock(const AudioSourceChannelInfo & bufferToFill)103 void ChannelRemappingAudioSource::getNextAudioBlock (const AudioSourceChannelInfo& bufferToFill)
104 {
105 const ScopedLock sl (lock);
106
107 buffer.setSize (requiredNumberOfChannels, bufferToFill.numSamples, false, false, true);
108
109 const int numChans = bufferToFill.buffer->getNumChannels();
110
111 for (int i = 0; i < buffer.getNumChannels(); ++i)
112 {
113 const int remappedChan = getRemappedInputChannel (i);
114
115 if (remappedChan >= 0 && remappedChan < numChans)
116 {
117 buffer.copyFrom (i, 0, *bufferToFill.buffer,
118 remappedChan,
119 bufferToFill.startSample,
120 bufferToFill.numSamples);
121 }
122 else
123 {
124 buffer.clear (i, 0, bufferToFill.numSamples);
125 }
126 }
127
128 remappedInfo.numSamples = bufferToFill.numSamples;
129
130 source->getNextAudioBlock (remappedInfo);
131
132 bufferToFill.clearActiveBufferRegion();
133
134 for (int i = 0; i < requiredNumberOfChannels; ++i)
135 {
136 const int remappedChan = getRemappedOutputChannel (i);
137
138 if (remappedChan >= 0 && remappedChan < numChans)
139 {
140 bufferToFill.buffer->addFrom (remappedChan, bufferToFill.startSample,
141 buffer, i, 0, bufferToFill.numSamples);
142
143 }
144 }
145 }
146
147 //==============================================================================
createXml() const148 std::unique_ptr<XmlElement> ChannelRemappingAudioSource::createXml() const
149 {
150 auto e = std::make_unique<XmlElement> ("MAPPINGS");
151 String ins, outs;
152
153 const ScopedLock sl (lock);
154
155 for (int i = 0; i < remappedInputs.size(); ++i)
156 ins << remappedInputs.getUnchecked(i) << ' ';
157
158 for (int i = 0; i < remappedOutputs.size(); ++i)
159 outs << remappedOutputs.getUnchecked(i) << ' ';
160
161 e->setAttribute ("inputs", ins.trimEnd());
162 e->setAttribute ("outputs", outs.trimEnd());
163
164 return e;
165 }
166
restoreFromXml(const XmlElement & e)167 void ChannelRemappingAudioSource::restoreFromXml (const XmlElement& e)
168 {
169 if (e.hasTagName ("MAPPINGS"))
170 {
171 const ScopedLock sl (lock);
172
173 clearAllMappings();
174
175 StringArray ins, outs;
176 ins.addTokens (e.getStringAttribute ("inputs"), false);
177 outs.addTokens (e.getStringAttribute ("outputs"), false);
178
179 for (int i = 0; i < ins.size(); ++i)
180 remappedInputs.add (ins[i].getIntValue());
181
182 for (int i = 0; i < outs.size(); ++i)
183 remappedOutputs.add (outs[i].getIntValue());
184 }
185 }
186
187 } // namespace juce
188