| /* |
| * Copyright (C) 2010 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. |
| * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of |
| * its contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE 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 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 AudioParam_h |
| #define AudioParam_h |
| |
| #include "bindings/core/v8/ScriptWrappable.h" |
| #include "core/dom/DOMTypedArray.h" |
| #include "modules/webaudio/AbstractAudioContext.h" |
| #include "modules/webaudio/AudioParamTimeline.h" |
| #include "modules/webaudio/AudioSummingJunction.h" |
| #include "wtf/PassRefPtr.h" |
| #include "wtf/text/WTFString.h" |
| #include <sys/types.h> |
| |
| namespace blink { |
| |
| class AudioNodeOutput; |
| |
| // AudioParamHandler is an actual implementation of web-exposed AudioParam |
| // interface. Each of AudioParam object creates and owns an AudioParamHandler, |
| // and it is responsible for all of AudioParam tasks. An AudioParamHandler |
| // object is owned by the originator AudioParam object, and some audio |
| // processing classes have additional references. An AudioParamHandler can |
| // outlive the owner AudioParam, and it never dies before the owner AudioParam |
| // dies. |
| class AudioParamHandler final : public ThreadSafeRefCounted<AudioParamHandler>, public AudioSummingJunction { |
| public: |
| static const double DefaultSmoothingConstant; |
| static const double SnapThreshold; |
| |
| static PassRefPtr<AudioParamHandler> create(AbstractAudioContext& context, double defaultValue) |
| { |
| return adoptRef(new AudioParamHandler(context, defaultValue)); |
| } |
| |
| // This should be used only in audio rendering thread. |
| AbstractAudioContext* context() const; |
| |
| // AudioSummingJunction |
| void didUpdate() override { } |
| |
| AudioParamTimeline& timeline() { return m_timeline; } |
| |
| // Intrinsic value. |
| float value(); |
| void setValue(float); |
| |
| // Final value for k-rate parameters, otherwise use calculateSampleAccurateValues() for a-rate. |
| // Must be called in the audio thread. |
| float finalValue(); |
| |
| float defaultValue() const { return static_cast<float>(m_defaultValue); } |
| |
| // Value smoothing: |
| |
| // When a new value is set with setValue(), in our internal use of the parameter we don't immediately jump to it. |
| // Instead we smoothly approach this value to avoid glitching. |
| float smoothedValue(); |
| |
| // Smoothly exponentially approaches to (de-zippers) the desired value. |
| // Returns true if smoothed value has already snapped exactly to value. |
| bool smooth(); |
| |
| void resetSmoothedValue() { m_smoothedValue = intrinsicValue(); } |
| |
| bool hasSampleAccurateValues() { return m_timeline.hasValues() || numberOfRenderingConnections(); } |
| |
| // Calculates numberOfValues parameter values starting at the context's current time. |
| // Must be called in the context's render thread. |
| void calculateSampleAccurateValues(float* values, unsigned numberOfValues); |
| |
| // Connect an audio-rate signal to control this parameter. |
| void connect(AudioNodeOutput&); |
| void disconnect(AudioNodeOutput&); |
| |
| private: |
| AudioParamHandler(AbstractAudioContext& context, double defaultValue) |
| : AudioSummingJunction(context.deferredTaskHandler()) |
| , m_intrinsicValue(defaultValue) |
| , m_defaultValue(defaultValue) |
| , m_smoothedValue(defaultValue) |
| , m_context(&context) { } |
| |
| // sampleAccurate corresponds to a-rate (audio rate) vs. k-rate in the Web Audio specification. |
| void calculateFinalValues(float* values, unsigned numberOfValues, bool sampleAccurate); |
| void calculateTimelineValues(float* values, unsigned numberOfValues); |
| |
| // Intrinsic value |
| float m_intrinsicValue; |
| float intrinsicValue() const { return noBarrierLoad(&m_intrinsicValue); } |
| void setIntrinsicValue(float newValue) { noBarrierStore(&m_intrinsicValue, newValue); } |
| |
| float m_defaultValue; |
| |
| // Smoothing (de-zippering) |
| float m_smoothedValue; |
| |
| AudioParamTimeline m_timeline; |
| |
| // We can't make this Persistent because of a reference cycle. It's safe to |
| // access this field only when we're rendering audio. |
| UntracedMember<AbstractAudioContext> m_context; |
| }; |
| |
| // AudioParam class represents web-exposed AudioParam interface. |
| class AudioParam final : public GarbageCollectedFinalized<AudioParam>, public ScriptWrappable { |
| DEFINE_WRAPPERTYPEINFO(); |
| public: |
| static AudioParam* create(AbstractAudioContext&, double defaultValue); |
| DECLARE_TRACE(); |
| // |handler| always returns a valid object. |
| AudioParamHandler& handler() const { return *m_handler; } |
| // |context| always returns a valid object. |
| AbstractAudioContext* context() const { return m_context; } |
| |
| float value() const; |
| void setValue(float); |
| float defaultValue() const; |
| AudioParam* setValueAtTime(float value, double time, ExceptionState&); |
| AudioParam* linearRampToValueAtTime(float value, double time, ExceptionState&); |
| AudioParam* exponentialRampToValueAtTime(float value, double time, ExceptionState&); |
| AudioParam* setTargetAtTime(float target, double time, double timeConstant, ExceptionState&); |
| AudioParam* setValueCurveAtTime(DOMFloat32Array* curve, double time, double duration, ExceptionState&); |
| AudioParam* cancelScheduledValues(double startTime, ExceptionState&); |
| |
| private: |
| AudioParam(AbstractAudioContext&, double defaultValue); |
| |
| RefPtr<AudioParamHandler> m_handler; |
| Member<AbstractAudioContext> m_context; |
| }; |
| |
| } // namespace blink |
| |
| #endif // AudioParam_h |