OpenShot Audio Library | OpenShotAudio: juce_AudioSourcePlayer.cpp Source File

OpenShot Audio Library | OpenShotAudio 0.3.1

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juce_AudioSourcePlayer.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
26AudioSourcePlayer::AudioSourcePlayer()
27{
28}
29
30AudioSourcePlayer::~AudioSourcePlayer()
31{
32 setSource (nullptr);
33}
34
35 void AudioSourcePlayer::setSource (AudioSource* newSource)
36{
37 if (source != newSource)
38 {
39 auto* oldSource = source;
40
41 if (newSource != nullptr && bufferSize > 0 && sampleRate > 0)
42 newSource->prepareToPlay (bufferSize, sampleRate);
43
44 {
45 const ScopedLock sl (readLock);
46 source = newSource;
47 }
48
49 if (oldSource != nullptr)
50 oldSource->releaseResources();
51 }
52}
53
54 void AudioSourcePlayer::setGain (const float newGain) noexcept
55{
56 gain = newGain;
57}
58
59 void AudioSourcePlayer::audioDeviceIOCallback (const float** inputChannelData,
60 int totalNumInputChannels,
61 float** outputChannelData,
62 int totalNumOutputChannels,
63 int numSamples)
64{
65 // these should have been prepared by audioDeviceAboutToStart()...
66 jassert (sampleRate > 0 && bufferSize > 0);
67
68 const ScopedLock sl (readLock);
69
70 if (source != nullptr)
71 {
72 int numActiveChans = 0, numInputs = 0, numOutputs = 0;
73
74 // messy stuff needed to compact the channels down into an array
75 // of non-zero pointers..
76 for (int i = 0; i < totalNumInputChannels; ++i)
77 {
78 if (inputChannelData[i] != nullptr)
79 {
80 inputChans [numInputs++] = inputChannelData[i];
81 if (numInputs >= numElementsInArray (inputChans))
82 break;
83 }
84 }
85
86 for (int i = 0; i < totalNumOutputChannels; ++i)
87 {
88 if (outputChannelData[i] != nullptr)
89 {
90 outputChans [numOutputs++] = outputChannelData[i];
91 if (numOutputs >= numElementsInArray (outputChans))
92 break;
93 }
94 }
95
96 if (numInputs > numOutputs)
97 {
98 // if there aren't enough output channels for the number of
99 // inputs, we need to create some temporary extra ones (can't
100 // use the input data in case it gets written to)
101 tempBuffer.setSize (numInputs - numOutputs, numSamples,
102 false, false, true);
103
104 for (int i = 0; i < numOutputs; ++i)
105 {
106 channels[numActiveChans] = outputChans[i];
107 memcpy (channels[numActiveChans], inputChans[i], (size_t) numSamples * sizeof (float));
108 ++numActiveChans;
109 }
110
111 for (int i = numOutputs; i < numInputs; ++i)
112 {
113 channels[numActiveChans] = tempBuffer.getWritePointer (i - numOutputs);
114 memcpy (channels[numActiveChans], inputChans[i], (size_t) numSamples * sizeof (float));
115 ++numActiveChans;
116 }
117 }
118 else
119 {
120 for (int i = 0; i < numInputs; ++i)
121 {
122 channels[numActiveChans] = outputChans[i];
123 memcpy (channels[numActiveChans], inputChans[i], (size_t) numSamples * sizeof (float));
124 ++numActiveChans;
125 }
126
127 for (int i = numInputs; i < numOutputs; ++i)
128 {
129 channels[numActiveChans] = outputChans[i];
130 zeromem (channels[numActiveChans], (size_t) numSamples * sizeof (float));
131 ++numActiveChans;
132 }
133 }
134
135 AudioBuffer<float> buffer (channels, numActiveChans, numSamples);
136
137 AudioSourceChannelInfo info (&buffer, 0, numSamples);
138 source->getNextAudioBlock (info);
139
140 for (int i = info.buffer->getNumChannels(); --i >= 0;)
141 buffer.applyGainRamp (i, info.startSample, info.numSamples, lastGain, gain);
142
143 lastGain = gain;
144 }
145 else
146 {
147 for (int i = 0; i < totalNumOutputChannels; ++i)
148 if (outputChannelData[i] != nullptr)
149 zeromem (outputChannelData[i], (size_t) numSamples * sizeof (float));
150 }
151}
152
153 void AudioSourcePlayer::audioDeviceAboutToStart (AudioIODevice* device)
154{
155 prepareToPlay (device->getCurrentSampleRate(),
156 device->getCurrentBufferSizeSamples());
157}
158
159 void AudioSourcePlayer::prepareToPlay (double newSampleRate, int newBufferSize)
160{
161 sampleRate = newSampleRate;
162 bufferSize = newBufferSize;
163 zeromem (channels, sizeof (channels));
164
165 if (source != nullptr)
166 source->prepareToPlay (bufferSize, sampleRate);
167}
168
169 void AudioSourcePlayer::audioDeviceStopped()
170{
171 if (source != nullptr)
172 source->releaseResources();
173
174 sampleRate = 0.0;
175 bufferSize = 0;
176
177 tempBuffer.setSize (2, 8);
178}
179
180} // namespace juce
juce::AudioBuffer
Definition: juce_AudioSampleBuffer.h:34
juce::AudioBuffer::setSize
void setSize(int newNumChannels, int newNumSamples, bool keepExistingContent=false, bool clearExtraSpace=false, bool avoidReallocating=false)
Definition: juce_AudioSampleBuffer.h:331
juce::AudioBuffer::getWritePointer
Type * getWritePointer(int channelNumber) noexcept
Definition: juce_AudioSampleBuffer.h:273
juce::AudioBuffer::getNumChannels
int getNumChannels() const noexcept
Definition: juce_AudioSampleBuffer.h:233
juce::AudioBuffer::applyGainRamp
void applyGainRamp(int channel, int startSample, int numSamples, Type startGain, Type endGain) noexcept
Definition: juce_AudioSampleBuffer.h:644
juce::AudioIODevice
Definition: juce_AudioIODevice.h:137
juce::AudioIODevice::getCurrentSampleRate
virtual double getCurrentSampleRate()=0
juce::AudioIODevice::getCurrentBufferSizeSamples
virtual int getCurrentBufferSizeSamples()=0
juce::AudioSourcePlayer::setGain
void setGain(float newGain) noexcept
Definition: juce_AudioSourcePlayer.cpp:54
juce::AudioSourcePlayer::setSource
void setSource(AudioSource *newSource)
Definition: juce_AudioSourcePlayer.cpp:35
juce::AudioSourcePlayer::AudioSourcePlayer
AudioSourcePlayer()
Definition: juce_AudioSourcePlayer.cpp:26
juce::AudioSourcePlayer::audioDeviceStopped
void audioDeviceStopped() override
Definition: juce_AudioSourcePlayer.cpp:169
juce::AudioSourcePlayer::audioDeviceIOCallback
void audioDeviceIOCallback(const float **inputChannelData, int totalNumInputChannels, float **outputChannelData, int totalNumOutputChannels, int numSamples) override
Definition: juce_AudioSourcePlayer.cpp:59
juce::AudioSourcePlayer::~AudioSourcePlayer
~AudioSourcePlayer() override
Definition: juce_AudioSourcePlayer.cpp:30
juce::AudioSourcePlayer::prepareToPlay
void prepareToPlay(double sampleRate, int blockSize)
Definition: juce_AudioSourcePlayer.cpp:159
juce::AudioSourcePlayer::audioDeviceAboutToStart
void audioDeviceAboutToStart(AudioIODevice *device) override
Definition: juce_AudioSourcePlayer.cpp:153
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::AudioSource::getNextAudioBlock
virtual void getNextAudioBlock(const AudioSourceChannelInfo &bufferToFill)=0
juce::GenericScopedLock
Definition: juce_ScopedLock.h:55
juce::AudioSourceChannelInfo
Definition: juce_AudioSource.h:33
juce::AudioSourceChannelInfo::numSamples
int numSamples
Definition: juce_AudioSource.h:81
juce::AudioSourceChannelInfo::buffer
AudioBuffer< float > * buffer
Definition: juce_AudioSource.h:73
juce::AudioSourceChannelInfo::startSample
int startSample
Definition: juce_AudioSource.h:77