OpenShot Audio Library | OpenShotAudio: juce_Sampler.cpp Source File

OpenShot Audio Library | OpenShotAudio 0.6.0

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juce_Sampler.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 By using JUCE, you agree to the terms of both the JUCE 7 End-User License
11 Agreement and JUCE Privacy Policy.
12
13 End User License Agreement: www.juce.com/juce-7-licence
14 Privacy Policy: www.juce.com/juce-privacy-policy
15
16 Or: You may also use this code under the terms of the GPL v3 (see
17 www.gnu.org/licenses).
18
19 JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
20 EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
21 DISCLAIMED.
22
23 ==============================================================================
24*/
25
26namespace juce
27{
28
29SamplerSound::SamplerSound (const String& soundName,
30 AudioFormatReader& source,
31 const BigInteger& notes,
32 int midiNoteForNormalPitch,
33 double attackTimeSecs,
34 double releaseTimeSecs,
35 double maxSampleLengthSeconds)
36 : name (soundName),
37 sourceSampleRate (source.sampleRate),
38 midiNotes (notes),
39 midiRootNote (midiNoteForNormalPitch)
40{
41 if (sourceSampleRate > 0 && source.lengthInSamples > 0)
42 {
43 length = jmin ((int) source.lengthInSamples,
44 (int) (maxSampleLengthSeconds * sourceSampleRate));
45
46 data.reset (new AudioBuffer<float> (jmin (2, (int) source.numChannels), length + 4));
47
48 source.read (data.get(), 0, length + 4, 0, true, true);
49
50 params.attack = static_cast<float> (attackTimeSecs);
51 params.release = static_cast<float> (releaseTimeSecs);
52 }
53}
54
55SamplerSound::~SamplerSound()
56{
57}
58
59 bool SamplerSound::appliesToNote (int midiNoteNumber)
60{
61 return midiNotes[midiNoteNumber];
62}
63
64 bool SamplerSound::appliesToChannel (int /*midiChannel*/)
65{
66 return true;
67}
68
69//==============================================================================
70SamplerVoice::SamplerVoice() {}
71SamplerVoice::~SamplerVoice() {}
72
73 bool SamplerVoice::canPlaySound (SynthesiserSound* sound)
74{
75 return dynamic_cast<const SamplerSound*> (sound) != nullptr;
76}
77
78 void SamplerVoice::startNote (int midiNoteNumber, float velocity, SynthesiserSound* s, int /*currentPitchWheelPosition*/)
79{
80 if (auto* sound = dynamic_cast<const SamplerSound*> (s))
81 {
82 pitchRatio = std::pow (2.0, (midiNoteNumber - sound->midiRootNote) / 12.0)
83 * sound->sourceSampleRate / getSampleRate();
84
85 sourceSamplePosition = 0.0;
86 lgain = velocity;
87 rgain = velocity;
88
89 adsr.setSampleRate (sound->sourceSampleRate);
90 adsr.setParameters (sound->params);
91
92 adsr.noteOn();
93 }
94 else
95 {
96 jassertfalse; // this object can only play SamplerSounds!
97 }
98}
99
100 void SamplerVoice::stopNote (float /*velocity*/, bool allowTailOff)
101{
102 if (allowTailOff)
103 {
104 adsr.noteOff();
105 }
106 else
107 {
108 clearCurrentNote();
109 adsr.reset();
110 }
111}
112
113 void SamplerVoice::pitchWheelMoved (int /*newValue*/) {}
114 void SamplerVoice::controllerMoved (int /*controllerNumber*/, int /*newValue*/) {}
115
116//==============================================================================
117 void SamplerVoice::renderNextBlock (AudioBuffer<float>& outputBuffer, int startSample, int numSamples)
118{
119 if (auto* playingSound = static_cast<SamplerSound*> (getCurrentlyPlayingSound().get()))
120 {
121 auto& data = *playingSound->data;
122 const float* const inL = data.getReadPointer (0);
123 const float* const inR = data.getNumChannels() > 1 ? data.getReadPointer (1) : nullptr;
124
125 float* outL = outputBuffer.getWritePointer (0, startSample);
126 float* outR = outputBuffer.getNumChannels() > 1 ? outputBuffer.getWritePointer (1, startSample) : nullptr;
127
128 while (--numSamples >= 0)
129 {
130 auto pos = (int) sourceSamplePosition;
131 auto alpha = (float) (sourceSamplePosition - pos);
132 auto invAlpha = 1.0f - alpha;
133
134 // just using a very simple linear interpolation here..
135 float l = (inL[pos] * invAlpha + inL[pos + 1] * alpha);
136 float r = (inR != nullptr) ? (inR[pos] * invAlpha + inR[pos + 1] * alpha)
137 : l;
138
139 auto envelopeValue = adsr.getNextSample();
140
141 l *= lgain * envelopeValue;
142 r *= rgain * envelopeValue;
143
144 if (outR != nullptr)
145 {
146 *outL++ += l;
147 *outR++ += r;
148 }
149 else
150 {
151 *outL++ += (l + r) * 0.5f;
152 }
153
154 sourceSamplePosition += pitchRatio;
155
156 if (sourceSamplePosition > playingSound->length)
157 {
158 stopNote (0.0f, false);
159 break;
160 }
161 }
162 }
163}
164
165} // namespace juce
juce::AudioBuffer
Definition juce_AudioSampleBuffer.h:34
juce::AudioBuffer::getWritePointer
Type * getWritePointer(int channelNumber) noexcept
Definition juce_AudioSampleBuffer.h:291
juce::AudioBuffer::getNumChannels
int getNumChannels() const noexcept
Definition juce_AudioSampleBuffer.h:236
juce::AudioFormatReader
Definition juce_AudioFormatReader.h:44
juce::AudioFormatReader::lengthInSamples
int64 lengthInSamples
Definition juce_AudioFormatReader.h:231
juce::BigInteger
Definition juce_BigInteger.h:39
juce::SamplerSound
Definition juce_Sampler.h:44
juce::SamplerSound::appliesToChannel
bool appliesToChannel(int midiChannel) override
Definition juce_Sampler.cpp:64
juce::SamplerSound::SamplerSound
SamplerSound(const String &name, AudioFormatReader &source, const BigInteger &midiNotes, int midiNoteForNormalPitch, double attackTimeSecs, double releaseTimeSecs, double maxSampleLengthSeconds)
Definition juce_Sampler.cpp:29
juce::SamplerSound::appliesToNote
bool appliesToNote(int midiNoteNumber) override
Definition juce_Sampler.cpp:59
juce::SamplerSound::~SamplerSound
~SamplerSound() override
Definition juce_Sampler.cpp:55
juce::SamplerVoice::~SamplerVoice
~SamplerVoice() override
Definition juce_Sampler.cpp:71
juce::SamplerVoice::startNote
void startNote(int midiNoteNumber, float velocity, SynthesiserSound *, int pitchWheel) override
Definition juce_Sampler.cpp:78
juce::SamplerVoice::controllerMoved
void controllerMoved(int controllerNumber, int newValue) override
Definition juce_Sampler.cpp:114
juce::SamplerVoice::canPlaySound
bool canPlaySound(SynthesiserSound *) override
Definition juce_Sampler.cpp:73
juce::SamplerVoice::renderNextBlock
void renderNextBlock(AudioBuffer< float > &, int startSample, int numSamples) override
Definition juce_Sampler.cpp:117
juce::SamplerVoice::pitchWheelMoved
void pitchWheelMoved(int newValue) override
Definition juce_Sampler.cpp:113
juce::SamplerVoice::SamplerVoice
SamplerVoice()
Definition juce_Sampler.cpp:70
juce::SamplerVoice::stopNote
void stopNote(float velocity, bool allowTailOff) override
Definition juce_Sampler.cpp:100
juce::String
Definition juce_String.h:53
juce::SynthesiserSound
Definition juce_Synthesiser.h:42
juce::SynthesiserVoice::getSampleRate
double getSampleRate() const noexcept
Definition juce_Synthesiser.h:215
juce::SynthesiserVoice::clearCurrentNote
void clearCurrentNote()
Definition juce_Synthesiser.cpp:48
juce::SynthesiserVoice::getCurrentlyPlayingSound
SynthesiserSound::Ptr getCurrentlyPlayingSound() const noexcept
Definition juce_Synthesiser.h:106