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29 #ifndef AudioParamTimeline_h
30 #define AudioParamTimeline_h
32 #include "modules/webaudio/AudioContext.h"
33 #include "wtf/Float32Array.h"
34 #include "wtf/Forward.h"
35 #include "wtf/Threading.h"
36 #include "wtf/Vector.h"
40 class AudioParamTimeline {
46 void setValueAtTime(float value, double time);
47 void linearRampToValueAtTime(float value, double time);
48 void exponentialRampToValueAtTime(float value, double time, ExceptionState&);
49 void setTargetAtTime(float target, double time, double timeConstant);
50 void setValueCurveAtTime(Float32Array* curve, double time, double duration);
51 void cancelScheduledValues(double startTime);
53 // hasValue is set to true if a valid timeline value is returned.
54 // otherwise defaultValue is returned.
55 float valueForContextTime(AudioContext*, float defaultValue, bool& hasValue);
57 // Given the time range, calculates parameter values into the values buffer
58 // and returns the last parameter value calculated for "values" or the defaultValue if none were calculated.
59 // controlRate is the rate (number per second) at which parameter values will be calculated.
60 // It should equal sampleRate for sample-accurate parameter changes, and otherwise will usually match
61 // the render quantum size such that the parameter value changes once per render quantum.
62 float valuesForTimeRange(double startTime, double endTime, float defaultValue, float* values, unsigned numberOfValues, double sampleRate, double controlRate);
64 bool hasValues() { return m_events.size(); }
72 ExponentialRampToValue,
78 ParamEvent(Type type, float value, double time, double timeConstant, double duration, PassRefPtr<Float32Array> curve)
82 , m_timeConstant(timeConstant)
83 , m_duration(duration)
88 unsigned type() const { return m_type; }
89 float value() const { return m_value; }
90 double time() const { return m_time; }
91 double timeConstant() const { return m_timeConstant; }
92 double duration() const { return m_duration; }
93 Float32Array* curve() { return m_curve.get(); }
99 double m_timeConstant;
101 RefPtr<Float32Array> m_curve;
104 void insertEvent(const ParamEvent&);
105 float valuesForTimeRangeImpl(double startTime, double endTime, float defaultValue, float* values, unsigned numberOfValues, double sampleRate, double controlRate);
107 Vector<ParamEvent> m_events;
114 #endif // AudioParamTimeline_h