OpenShot Library | libopenshot-audio 0.2.0
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
27 : currentSampleRate (0.0), bufferSizeExpected (0)
28{
29}
30
32{
34}
35
36//==============================================================================
37void 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{
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
102void 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)
Changes the buffer's size or number of channels.
int getNumChannels() const noexcept
Returns the number of channels of audio data that this buffer contains.
int getNumSamples() const noexcept
Returns the number of samples allocated in each of the buffer's channels.
void addFrom(int destChannel, int destStartSample, const AudioBuffer &source, int sourceChannel, int sourceStartSample, int numSamples, Type gainToApplyToSource=Type(1)) noexcept
Adds samples from another buffer to this one.
Base class for objects that can produce a continuous stream of audio.
virtual void releaseResources()=0
Allows the source to release anything it no longer needs after playback has stopped.
virtual void prepareToPlay(int samplesPerBlockExpected, double sampleRate)=0
Tells the source to prepare for playing.
void shiftBits(int howManyBitsLeft, int startBit)
Shifts a section of bits left or right.
void setBit(int bitNumber)
Sets a specified bit to 1.
Automatically locks and unlocks a mutex object.
void removeInputSource(AudioSource *input)
Removes an input source.
void getNextAudioBlock(const AudioSourceChannelInfo &) override
Implementation of the AudioSource method.
MixerAudioSource()
Creates a MixerAudioSource.
void removeAllInputs()
Removes all the input sources.
void addInputSource(AudioSource *newInput, bool deleteWhenRemoved)
Adds an input source to the mixer.
void prepareToPlay(int samplesPerBlockExpected, double sampleRate) override
Implementation of the AudioSource method.
~MixerAudioSource() override
Destructor.
void releaseResources() override
Implementation of the AudioSource method.
An array designed for holding objects.
int size() const noexcept
Returns the number of items currently in the array.
ObjectClass * getUnchecked(const int index) const noexcept
Returns a pointer to the object at this index in the array, without checking whether the index is in-...
ObjectClass * add(ObjectClass *newObject) noexcept
Appends a new object to the end of the array.
Used by AudioSource::getNextAudioBlock().
int numSamples
The number of samples in the buffer which the callback is expected to fill with data.
void clearActiveBufferRegion() const
Convenient method to clear the buffer if the source is not producing any data.
AudioBuffer< float > * buffer
The destination buffer to fill with audio data.
int startSample
The first sample in the buffer from which the callback is expected to write data.