108 lines
4.0 KiB
C++
108 lines
4.0 KiB
C++
/*
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* Copyright (C) 2012, Google Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "AudioScheduledSourceNode.h"
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#include "OscillatorOptions.h"
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#include "OscillatorType.h"
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#include <wtf/Lock.h>
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namespace WebCore {
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class PeriodicWave;
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// OscillatorNode is an audio generator of periodic waveforms.
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class OscillatorNode final : public AudioScheduledSourceNode {
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WTF_MAKE_ISO_ALLOCATED(OscillatorNode);
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public:
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static ExceptionOr<Ref<OscillatorNode>> create(BaseAudioContext&, const OscillatorOptions& = { });
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virtual ~OscillatorNode();
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const char* activeDOMObjectName() const final { return "OscillatorNode"; }
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OscillatorType typeForBindings() const { ASSERT(isMainThread()); return m_type; }
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ExceptionOr<void> setTypeForBindings(OscillatorType);
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AudioParam* frequency() { return m_frequency.get(); }
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AudioParam* detune() { return m_detune.get(); }
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void setPeriodicWave(PeriodicWave&);
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protected:
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explicit OscillatorNode(BaseAudioContext&, const OscillatorOptions& = { });
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private:
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void process(size_t framesToProcess) final;
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double tailTime() const final { return 0; }
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double latencyTime() const final { return 0; }
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// Returns true if there are sample-accurate timeline parameter changes.
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bool calculateSampleAccuratePhaseIncrements(size_t framesToProcess) WTF_REQUIRES_LOCK(m_processLock);
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double processARate(int, float* destP, double virtualReadIndex, float* phaseIncrements) WTF_REQUIRES_LOCK(m_processLock);
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double processKRate(int, float* destP, double virtualReadIndex) WTF_REQUIRES_LOCK(m_processLock);
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bool propagatesSilence() const final;
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// One of the waveform types defined in the enum.
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OscillatorType m_type; // Only used on the main thread.
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// Frequency value in Hertz.
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RefPtr<AudioParam> m_frequency;
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// Detune value (deviating from the frequency) in Cents.
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RefPtr<AudioParam> m_detune;
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bool m_firstRender { true };
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// m_virtualReadIndex is a sample-frame index into our buffer representing the current playback position.
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// Since it's floating-point, it has sub-sample accuracy.
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double m_virtualReadIndex { 0 };
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// This synchronizes process().
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mutable Lock m_processLock;
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// Stores sample-accurate values calculated according to frequency and detune.
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AudioFloatArray m_phaseIncrements;
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AudioFloatArray m_detuneValues;
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RefPtr<PeriodicWave> m_periodicWave WTF_GUARDED_BY_LOCK(m_processLock);
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};
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String convertEnumerationToString(OscillatorType); // In JSOscillatorNode.cpp
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} // namespace WebCore
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namespace WTF {
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template<> struct LogArgument<WebCore::OscillatorType> {
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static String toString(WebCore::OscillatorType type) { return convertEnumerationToString(type); }
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};
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} // namespace WTF
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