2 * Copyright (C) 2012, Google Inc. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
16 * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
17 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
18 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
19 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
20 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
22 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 #ifndef OscillatorNode_h
26 #define OscillatorNode_h
28 #include "platform/audio/AudioBus.h"
29 #include "modules/webaudio/AudioParam.h"
30 #include "modules/webaudio/AudioScheduledSourceNode.h"
31 #include "wtf/OwnPtr.h"
32 #include "wtf/PassRefPtr.h"
33 #include "wtf/RefPtr.h"
34 #include "wtf/Threading.h"
41 // OscillatorNode is an audio generator of periodic waveforms.
43 class OscillatorNode final : public AudioScheduledSourceNode {
44 DEFINE_WRAPPERTYPEINFO();
47 // These must be defined as in the .idl file.
56 static OscillatorNode* create(AudioContext*, float sampleRate);
58 virtual ~OscillatorNode();
61 virtual void dispose() override;
62 virtual void process(size_t framesToProcess) override;
66 void setType(const String&);
68 AudioParam* frequency() { return m_frequency.get(); }
69 AudioParam* detune() { return m_detune.get(); }
71 void setPeriodicWave(PeriodicWave*);
73 virtual void trace(Visitor*) override;
76 OscillatorNode(AudioContext*, float sampleRate);
78 bool setType(unsigned); // Returns true on success.
80 // Returns true if there are sample-accurate timeline parameter changes.
81 bool calculateSampleAccuratePhaseIncrements(size_t framesToProcess);
83 virtual bool propagatesSilence() const override;
85 // One of the waveform types defined in the enum.
86 unsigned short m_type;
88 // Frequency value in Hertz.
89 Member<AudioParam> m_frequency;
91 // Detune value (deviating from the frequency) in Cents.
92 Member<AudioParam> m_detune;
96 // m_virtualReadIndex is a sample-frame index into our buffer representing the current playback position.
97 // Since it's floating-point, it has sub-sample accuracy.
98 double m_virtualReadIndex;
100 // This synchronizes process().
101 mutable Mutex m_processLock;
103 // Stores sample-accurate values calculated according to frequency and detune.
104 AudioFloatArray m_phaseIncrements;
105 AudioFloatArray m_detuneValues;
107 Member<PeriodicWave> m_periodicWave;
112 #endif // OscillatorNode_h