/*
* Copyright (C) 2010 Google Inc. All rights reserved.
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#ifndef HRTFDatabase_h
#define HRTFDatabase_h
#include "platform/audio/HRTFElevation.h"
#include "wtf/Forward.h"
#include "wtf/Noncopyable.h"
#include "wtf/OwnPtr.h"
#include "wtf/PassRefPtr.h"
#include "wtf/Vector.h"
namespace WebCore {
class HRTFKernel;
class PLATFORM_EXPORT HRTFDatabase {
WTF_MAKE_NONCOPYABLE(HRTFDatabase);
public:
static PassOwnPtr<HRTFDatabase> create(float sampleRate);
// getKernelsFromAzimuthElevation() returns a left and right ear kernel, and an interpolated left and right frame delay for the given azimuth and elevation.
// azimuthBlend must be in the range 0 -> 1.
// Valid values for azimuthIndex are 0 -> HRTFElevation::NumberOfTotalAzimuths - 1 (corresponding to angles of 0 -> 360).
// Valid values for elevationAngle are MinElevation -> MaxElevation.
void getKernelsFromAzimuthElevation(double azimuthBlend, unsigned azimuthIndex, double elevationAngle, HRTFKernel* &kernelL, HRTFKernel* &kernelR, double& frameDelayL, double& frameDelayR);
// Returns the number of different azimuth angles.
static unsigned numberOfAzimuths() { return HRTFElevation::NumberOfTotalAzimuths; }
float sampleRate() const { return m_sampleRate; }
// Number of elevations loaded from resource.
static const unsigned NumberOfRawElevations;
private:
explicit HRTFDatabase(float sampleRate);
// Minimum and maximum elevation angles (inclusive) for a HRTFDatabase.
static const int MinElevation;
static const int MaxElevation;
static const unsigned RawElevationAngleSpacing;
// Interpolates by this factor to get the total number of elevations from every elevation loaded from resource.
static const unsigned InterpolationFactor;
// Total number of elevations after interpolation.
static const unsigned NumberOfTotalElevations;
// Returns the index for the correct HRTFElevation given the elevation angle.
static unsigned indexFromElevationAngle(double);
Vector<OwnPtr<HRTFElevation> > m_elevations;
float m_sampleRate;
};
} // namespace WebCore
#endif // HRTFDatabase_h