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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.
*
* 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 PannerNode_h
#define PannerNode_h
#include "platform/audio/AudioBus.h"
#include "platform/audio/Cone.h"
#include "platform/audio/Distance.h"
#include "platform/audio/HRTFDatabaseLoader.h"
#include "platform/audio/Panner.h"
#include "modules/webaudio/AudioListener.h"
#include "modules/webaudio/AudioNode.h"
#include "platform/geometry/FloatPoint3D.h"
#include "wtf/HashMap.h"
#include "wtf/OwnPtr.h"
namespace WebCore {
// PannerNode is an AudioNode with one input and one output.
// It positions a sound in 3D space, with the exact effect dependent on the panning model.
// It has a position and an orientation in 3D space which is relative to the position and orientation of the context's AudioListener.
// A distance effect will attenuate the gain as the position moves away from the listener.
// A cone effect will attenuate the gain as the orientation moves away from the listener.
// All of these effects follow the OpenAL specification very closely.
class PannerNode FINAL : public AudioNode {
public:
// These enums are used to distinguish what cached values of panner are dirty.
enum {
AzimuthElevationDirty = 0x1,
DistanceConeGainDirty = 0x2,
DopplerRateDirty = 0x4,
};
static PassRefPtrWillBeRawPtr<PannerNode> create(AudioContext* context, float sampleRate)
{
return adoptRefWillBeNoop(new PannerNode(context, sampleRate));
}
virtual ~PannerNode();
// AudioNode
virtual void process(size_t framesToProcess) OVERRIDE;
virtual void pullInputs(size_t framesToProcess) OVERRIDE;
virtual void initialize() OVERRIDE;
virtual void uninitialize() OVERRIDE;
// Panning model
String panningModel() const;
void setPanningModel(const String&);
// Position, orientation and velocity
void setPosition(float x, float y, float z);
void setOrientation(float x, float y, float z);
void setVelocity(float x, float y, float z);
// Distance parameters
String distanceModel() const;
void setDistanceModel(const String&);
double refDistance() { return m_distanceEffect.refDistance(); }
void setRefDistance(double);
double maxDistance() { return m_distanceEffect.maxDistance(); }
void setMaxDistance(double);
double rolloffFactor() { return m_distanceEffect.rolloffFactor(); }
void setRolloffFactor(double);
// Sound cones - angles in degrees
double coneInnerAngle() const { return m_coneEffect.innerAngle(); }
void setConeInnerAngle(double);
double coneOuterAngle() const { return m_coneEffect.outerAngle(); }
void setConeOuterAngle(double);
double coneOuterGain() const { return m_coneEffect.outerGain(); }
void setConeOuterGain(double);
void markPannerAsDirty(unsigned);
// It must be called on audio thread, currently called only process() in AudioBufferSourceNode.
double dopplerRate();
virtual double tailTime() const OVERRIDE { return m_panner ? m_panner->tailTime() : 0; }
virtual double latencyTime() const OVERRIDE { return m_panner ? m_panner->latencyTime() : 0; }
private:
PannerNode(AudioContext*, float sampleRate);
// AudioContext's listener
AudioListener* listener();
bool setPanningModel(unsigned); // Returns true on success.
bool setDistanceModel(unsigned); // Returns true on success.
void calculateAzimuthElevation(double* outAzimuth, double* outElevation);
float calculateDistanceConeGain(); // Returns the combined distance and cone gain attenuation.
double calculateDopplerRate();
void azimuthElevation(double* outAzimuth, double* outElevation);
float distanceConeGain();
bool isAzimuthElevationDirty() const { return m_isAzimuthElevationDirty; }
bool isDistanceConeGainDirty() const { return m_isDistanceConeGainDirty; }
bool isDopplerRateDirty() const { return m_isDopplerRateDirty; }
// Notifies any AudioBufferSourceNodes connected to us either directly or indirectly about our existence.
// This is in order to handle the pitch change necessary for the doppler shift.
void notifyAudioSourcesConnectedToNode(AudioNode*, HashMap<AudioNode*, bool> &visitedNodes);
OwnPtr<Panner> m_panner;
unsigned m_panningModel;
unsigned m_distanceModel;
// Current source location information
FloatPoint3D m_position;
FloatPoint3D m_orientation;
FloatPoint3D m_velocity;
bool m_isAzimuthElevationDirty;
bool m_isDistanceConeGainDirty;
bool m_isDopplerRateDirty;
// Gain
DistanceEffect m_distanceEffect;
ConeEffect m_coneEffect;
float m_lastGain;
// Cached values
double m_cachedAzimuth;
double m_cachedElevation;
float m_cachedDistanceConeGain;
double m_cachedDopplerRate;
RefPtr<HRTFDatabaseLoader> m_hrtfDatabaseLoader;
// AudioContext's connection count
unsigned m_connectionCount;
// Synchronize process() with setting of the panning model, source's location information, listener, distance parameters and sound cones.
mutable Mutex m_processLock;
};
} // namespace WebCore
#endif // PannerNode_h
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