OpenShot Audio Library | OpenShotAudio: juce_AudioSourcePlayer.cpp Source File

OpenShot Audio Library | OpenShotAudio 1.0.0

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juce_AudioSourcePlayer.cpp
1/*
2 ==============================================================================
3
4 This file is part of the JUCE library.
5 Copyright (c) 2022 - Raw Material Software Limited
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::audioDeviceIOCallbackWithContext (const float* const* inputChannelData,
60 int totalNumInputChannels,
61 float* const* outputChannelData,
62 int totalNumOutputChannels,
63 int numSamples,
64 [[maybe_unused]] const AudioIODeviceCallbackContext& context)
65{
66 // these should have been prepared by audioDeviceAboutToStart()...
67 jassert (sampleRate > 0 && bufferSize > 0);
68
69 const ScopedLock sl (readLock);
70
71 if (source != nullptr)
72 {
73 int numActiveChans = 0, numInputs = 0, numOutputs = 0;
74
75 // messy stuff needed to compact the channels down into an array
76 // of non-zero pointers..
77 for (int i = 0; i < totalNumInputChannels; ++i)
78 {
79 if (inputChannelData[i] != nullptr)
80 {
81 inputChans [numInputs++] = inputChannelData[i];
82 if (numInputs >= numElementsInArray (inputChans))
83 break;
84 }
85 }
86
87 for (int i = 0; i < totalNumOutputChannels; ++i)
88 {
89 if (outputChannelData[i] != nullptr)
90 {
91 outputChans [numOutputs++] = outputChannelData[i];
92 if (numOutputs >= numElementsInArray (outputChans))
93 break;
94 }
95 }
96
97 if (numInputs > numOutputs)
98 {
99 // if there aren't enough output channels for the number of
100 // inputs, we need to create some temporary extra ones (can't
101 // use the input data in case it gets written to)
102 tempBuffer.setSize (numInputs - numOutputs, numSamples,
103 false, false, true);
104
105 for (int i = 0; i < numOutputs; ++i)
106 {
107 channels[numActiveChans] = outputChans[i];
108 memcpy (channels[numActiveChans], inputChans[i], (size_t) numSamples * sizeof (float));
109 ++numActiveChans;
110 }
111
112 for (int i = numOutputs; i < numInputs; ++i)
113 {
114 channels[numActiveChans] = tempBuffer.getWritePointer (i - numOutputs);
115 memcpy (channels[numActiveChans], inputChans[i], (size_t) numSamples * sizeof (float));
116 ++numActiveChans;
117 }
118 }
119 else
120 {
121 for (int i = 0; i < numInputs; ++i)
122 {
123 channels[numActiveChans] = outputChans[i];
124 memcpy (channels[numActiveChans], inputChans[i], (size_t) numSamples * sizeof (float));
125 ++numActiveChans;
126 }
127
128 for (int i = numInputs; i < numOutputs; ++i)
129 {
130 channels[numActiveChans] = outputChans[i];
131 zeromem (channels[numActiveChans], (size_t) numSamples * sizeof (float));
132 ++numActiveChans;
133 }
134 }
135
136 AudioBuffer<float> buffer (channels, numActiveChans, numSamples);
137
138 AudioSourceChannelInfo info (&buffer, 0, numSamples);
139 source->getNextAudioBlock (info);
140
141 for (int i = info.buffer->getNumChannels(); --i >= 0;)
142 buffer.applyGainRamp (i, info.startSample, info.numSamples, lastGain, gain);
143
144 lastGain = gain;
145 }
146 else
147 {
148 for (int i = 0; i < totalNumOutputChannels; ++i)
149 if (outputChannelData[i] != nullptr)
150 zeromem (outputChannelData[i], (size_t) numSamples * sizeof (float));
151 }
152}
153
154 void AudioSourcePlayer::audioDeviceAboutToStart (AudioIODevice* device)
155{
156 prepareToPlay (device->getCurrentSampleRate(),
157 device->getCurrentBufferSizeSamples());
158}
159
160 void AudioSourcePlayer::prepareToPlay (double newSampleRate, int newBufferSize)
161{
162 sampleRate = newSampleRate;
163 bufferSize = newBufferSize;
164 zeromem (channels, sizeof (channels));
165
166 if (source != nullptr)
167 source->prepareToPlay (bufferSize, sampleRate);
168}
169
170 void AudioSourcePlayer::audioDeviceStopped()
171{
172 if (source != nullptr)
173 source->releaseResources();
174
175 sampleRate = 0.0;
176 bufferSize = 0;
177
178 tempBuffer.setSize (2, 8);
179}
180
181} // namespace juce
juce::AudioBuffer
Definition juce_AudioSampleBuffer.h:34
juce::AudioBuffer::getNumChannels
int getNumChannels() const noexcept
Definition juce_AudioSampleBuffer.h:236
juce::AudioBuffer::applyGainRamp
void applyGainRamp(int channel, int startSample, int numSamples, Type startGain, Type endGain) noexcept
Definition juce_AudioSampleBuffer.h:726
juce::AudioIODevice
Definition juce_AudioIODevice.h:151
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::audioDeviceIOCallbackWithContext
void audioDeviceIOCallbackWithContext(const float *const *inputChannelData, int totalNumInputChannels, float *const *outputChannelData, int totalNumOutputChannels, int numSamples, const AudioIODeviceCallbackContext &context) override
Definition juce_AudioSourcePlayer.cpp:59
juce::AudioSourcePlayer::AudioSourcePlayer
AudioSourcePlayer()
Definition juce_AudioSourcePlayer.cpp:26
juce::AudioSourcePlayer::audioDeviceStopped
void audioDeviceStopped() override
Definition juce_AudioSourcePlayer.cpp:170
juce::AudioSourcePlayer::~AudioSourcePlayer
~AudioSourcePlayer() override
Definition juce_AudioSourcePlayer.cpp:30
juce::AudioSourcePlayer::prepareToPlay
void prepareToPlay(double sampleRate, int blockSize)
Definition juce_AudioSourcePlayer.cpp:160
juce::AudioSourcePlayer::audioDeviceAboutToStart
void audioDeviceAboutToStart(AudioIODevice *device) override
Definition juce_AudioSourcePlayer.cpp:154
juce::AudioSource
Definition juce_AudioSource.h:110
juce::AudioSource::prepareToPlay
virtual void prepareToPlay(int samplesPerBlockExpected, double sampleRate)=0
juce::AudioIODeviceCallbackContext
Definition juce_AudioIODevice.h:34
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