| /* |
| * Copyright (C) 2012, Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
| * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH |
| * DAMAGE. |
| */ |
| |
| #ifndef OscillatorNode_h |
| #define OscillatorNode_h |
| |
| #include "modules/webaudio/AudioParam.h" |
| #include "modules/webaudio/AudioScheduledSourceNode.h" |
| #include "modules/webaudio/OscillatorOptions.h" |
| #include "platform/audio/AudioBus.h" |
| #include "wtf/PassRefPtr.h" |
| #include "wtf/RefPtr.h" |
| #include "wtf/Threading.h" |
| |
| namespace blink { |
| |
| class BaseAudioContext; |
| class ExceptionState; |
| class OscillatorOptions; |
| class PeriodicWave; |
| |
| // OscillatorNode is an audio generator of periodic waveforms. |
| |
| class OscillatorHandler final : public AudioScheduledSourceHandler { |
| public: |
| // The waveform type. |
| // These must be defined as in the .idl file. |
| enum { SINE = 0, SQUARE = 1, SAWTOOTH = 2, TRIANGLE = 3, CUSTOM = 4 }; |
| |
| static PassRefPtr<OscillatorHandler> create(AudioNode&, |
| float sampleRate, |
| AudioParamHandler& frequency, |
| AudioParamHandler& detune); |
| ~OscillatorHandler() override; |
| |
| // AudioHandler |
| void process(size_t framesToProcess) override; |
| |
| String type() const; |
| void setType(const String&, ExceptionState&); |
| |
| void setPeriodicWave(PeriodicWave*); |
| |
| private: |
| OscillatorHandler(AudioNode&, |
| float sampleRate, |
| AudioParamHandler& frequency, |
| AudioParamHandler& detune); |
| bool setType(unsigned); // Returns true on success. |
| |
| // Returns true if there are sample-accurate timeline parameter changes. |
| bool calculateSampleAccuratePhaseIncrements(size_t framesToProcess); |
| |
| bool propagatesSilence() const override; |
| |
| // One of the waveform types defined in the enum. |
| unsigned short m_type; |
| |
| // Frequency value in Hertz. |
| RefPtr<AudioParamHandler> m_frequency; |
| |
| // Detune value (deviating from the frequency) in Cents. |
| RefPtr<AudioParamHandler> m_detune; |
| |
| bool m_firstRender; |
| |
| // m_virtualReadIndex is a sample-frame index into our buffer representing the current playback position. |
| // Since it's floating-point, it has sub-sample accuracy. |
| double m_virtualReadIndex; |
| |
| // Stores sample-accurate values calculated according to frequency and detune. |
| AudioFloatArray m_phaseIncrements; |
| AudioFloatArray m_detuneValues; |
| |
| // This Persistent doesn't make a reference cycle including the owner |
| // OscillatorNode. |
| Persistent<PeriodicWave> m_periodicWave; |
| }; |
| |
| class OscillatorNode final : public AudioScheduledSourceNode { |
| DEFINE_WRAPPERTYPEINFO(); |
| |
| public: |
| static OscillatorNode* create(BaseAudioContext&, ExceptionState&); |
| static OscillatorNode* create(BaseAudioContext*, |
| const OscillatorOptions&, |
| ExceptionState&); |
| DECLARE_VIRTUAL_TRACE(); |
| |
| String type() const; |
| void setType(const String&, ExceptionState&); |
| AudioParam* frequency(); |
| AudioParam* detune(); |
| void setPeriodicWave(PeriodicWave*); |
| |
| private: |
| OscillatorNode(BaseAudioContext&); |
| OscillatorHandler& oscillatorHandler() const; |
| |
| Member<AudioParam> m_frequency; |
| Member<AudioParam> m_detune; |
| }; |
| |
| } // namespace blink |
| |
| #endif // OscillatorNode_h |