/*
* Copyright (C) 2011 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
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*/
#ifndef AudioParamTimeline_h
#define AudioParamTimeline_h
#include "modules/webaudio/AudioContext.h"
#include "wtf/Float32Array.h"
#include "wtf/PassRefPtr.h"
#include "wtf/RefCounted.h"
#include "wtf/Threading.h"
#include "wtf/Vector.h"
namespace WebCore {
class AudioParamTimeline {
public:
AudioParamTimeline()
{
}
void setValueAtTime(float value, double time);
void linearRampToValueAtTime(float value, double time);
void exponentialRampToValueAtTime(float value, double time, ExceptionState&);
void setTargetAtTime(float target, double time, double timeConstant);
void setValueCurveAtTime(Float32Array* curve, double time, double duration);
void cancelScheduledValues(double startTime);
// hasValue is set to true if a valid timeline value is returned.
// otherwise defaultValue is returned.
float valueForContextTime(AudioContext*, float defaultValue, bool& hasValue);
// Given the time range, calculates parameter values into the values buffer
// and returns the last parameter value calculated for "values" or the defaultValue if none were calculated.
// controlRate is the rate (number per second) at which parameter values will be calculated.
// It should equal sampleRate for sample-accurate parameter changes, and otherwise will usually match
// the render quantum size such that the parameter value changes once per render quantum.
float valuesForTimeRange(double startTime, double endTime, float defaultValue, float* values, unsigned numberOfValues, double sampleRate, double controlRate);
bool hasValues() { return m_events.size(); }
private:
class ParamEvent {
public:
enum Type {
SetValue,
LinearRampToValue,
ExponentialRampToValue,
SetTarget,
SetValueCurve,
LastType
};
ParamEvent(Type type, float value, double time, double timeConstant, double duration, PassRefPtr<Float32Array> curve)
: m_type(type)
, m_value(value)
, m_time(time)
, m_timeConstant(timeConstant)
, m_duration(duration)
, m_curve(curve)
{
}
unsigned type() const { return m_type; }
float value() const { return m_value; }
double time() const { return m_time; }
double timeConstant() const { return m_timeConstant; }
double duration() const { return m_duration; }
Float32Array* curve() { return m_curve.get(); }
private:
unsigned m_type;
float m_value;
double m_time;
double m_timeConstant;
double m_duration;
RefPtr<Float32Array> m_curve;
};
void insertEvent(const ParamEvent&);
float valuesForTimeRangeImpl(double startTime, double endTime, float defaultValue, float* values, unsigned numberOfValues, double sampleRate, double controlRate);
Vector<ParamEvent> m_events;
Mutex m_eventsLock;
};
} // namespace WebCore
#endif // AudioParamTimeline_h