OpenShot Audio Library | OpenShotAudio 0.3.2
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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
29
34
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
54void AudioSourcePlayer::setGain (const float newGain) noexcept
55{
56 gain = newGain;
57}
58
61 float** outputChannelData,
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
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));
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));
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));
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));
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
154{
155 prepareToPlay (device->getCurrentSampleRate(),
156 device->getCurrentBufferSizeSamples());
157}
158
160{
161 sampleRate = newSampleRate;
162 bufferSize = newBufferSize;
163 zeromem (channels, sizeof (channels));
164
165 if (source != nullptr)
166 source->prepareToPlay (bufferSize, sampleRate);
167}
168
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
void setSize(int newNumChannels, int newNumSamples, bool keepExistingContent=false, bool clearExtraSpace=false, bool avoidReallocating=false)
Type * getWritePointer(int channelNumber) noexcept
void setGain(float newGain) noexcept
void setSource(AudioSource *newSource)
void audioDeviceIOCallback(const float **inputChannelData, int totalNumInputChannels, float **outputChannelData, int totalNumOutputChannels, int numSamples) override
void prepareToPlay(double sampleRate, int blockSize)
void audioDeviceAboutToStart(AudioIODevice *device) override
virtual void releaseResources()=0
virtual void prepareToPlay(int samplesPerBlockExpected, double sampleRate)=0
virtual void getNextAudioBlock(const AudioSourceChannelInfo &bufferToFill)=0