OpenShot Audio Library | OpenShotAudio  0.3.1
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 
23 namespace juce
24 {
25 
27  : currentSampleRate (0.0), bufferSizeExpected (0)
28 {
29 }
30 
32 {
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 
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 
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 
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 
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  {
155  }
156 }
157 
158 } // namespace juce
void setSize(int newNumChannels, int newNumSamples, bool keepExistingContent=false, bool clearExtraSpace=false, bool avoidReallocating=false)
int getNumChannels() const noexcept
int getNumSamples() const noexcept
void addFrom(int destChannel, int destStartSample, const AudioBuffer &source, int sourceChannel, int sourceStartSample, int numSamples, Type gainToApplyToSource=Type(1)) noexcept
virtual void releaseResources()=0
virtual void prepareToPlay(int samplesPerBlockExpected, double sampleRate)=0
void shiftBits(int howManyBitsLeft, int startBit)
void setBit(int bitNumber)
void removeInputSource(AudioSource *input)
void getNextAudioBlock(const AudioSourceChannelInfo &) override
void addInputSource(AudioSource *newInput, bool deleteWhenRemoved)
void prepareToPlay(int samplesPerBlockExpected, double sampleRate) override
int size() const noexcept
ObjectClass * getUnchecked(int index) const noexcept
ObjectClass * add(ObjectClass *newObject)
AudioBuffer< float > * buffer