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/*
* 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 "AudioContext.h"
#include "AudioParamTimeline.h"
#include "PlatformString.h"
#include <sys/types.h>
#include <wtf/Float32Array.h>
#include <wtf/PassRefPtr.h>
#include <wtf/RefCounted.h>
namespace WebCore {
class AudioParam : public RefCounted<AudioParam> {
public:
static const double DefaultSmoothingConstant;
static const double SnapThreshold;
static PassRefPtr<AudioParam> create(const String& name, double defaultValue, double minValue, double maxValue, unsigned units = 0)
{
return adoptRef(new AudioParam(name, defaultValue, minValue, maxValue, units));
}
AudioParam(const String& name, double defaultValue, double minValue, double maxValue, unsigned units = 0)
: m_name(name)
, m_value(defaultValue)
, m_defaultValue(defaultValue)
, m_minValue(minValue)
, m_maxValue(maxValue)
, m_units(units)
, m_smoothedValue(defaultValue)
, m_smoothingConstant(DefaultSmoothingConstant)
{
}
void setContext(AudioContext* context) { m_context = context; }
AudioContext* context() { return m_context.get(); }
float value();
void setValue(float);
String name() const { return m_name; }
float minValue() const { return static_cast<float>(m_minValue); }
float maxValue() const { return static_cast<float>(m_maxValue); }
float defaultValue() const { return static_cast<float>(m_defaultValue); }
unsigned units() const { return m_units; }
// 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 = m_value; }
void setSmoothingConstant(double k) { m_smoothingConstant = k; }
// Parameter automation.
void setValueAtTime(float value, float time) { m_timeline.setValueAtTime(value, time); }
void linearRampToValueAtTime(float value, float time) { m_timeline.linearRampToValueAtTime(value, time); }
void exponentialRampToValueAtTime(float value, float time) { m_timeline.exponentialRampToValueAtTime(value, time); }
void setTargetValueAtTime(float targetValue, float time, float timeConstant) { m_timeline.setTargetValueAtTime(targetValue, time, timeConstant); }
void setValueCurveAtTime(Float32Array* curve, float time, float duration) { m_timeline.setValueCurveAtTime(curve, time, duration); }
void cancelScheduledValues(float startTime) { m_timeline.cancelScheduledValues(startTime); }
bool hasTimelineValues() { return m_timeline.hasValues(); }
// 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);
private:
RefPtr<AudioContext> m_context;
String m_name;
double m_value;
double m_defaultValue;
double m_minValue;
double m_maxValue;
unsigned m_units;
// Smoothing (de-zippering)
double m_smoothedValue;
double m_smoothingConstant;
AudioParamTimeline m_timeline;
};
} // namespace WebCore
#endif // AudioParam_h
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