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/*
* Copyright (C) 2010 Google Inc. All rights reserved.
*
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* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
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* 2. Redistributions in binary form must reproduce the above copyright
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* 3. Neither the name of Apple 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
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#ifndef HRTFDatabase_h
#define HRTFDatabase_h
#include "HRTFElevation.h"
#include <memory>
#include <wtf/Forward.h>
#include <wtf/Noncopyable.h>
#include <wtf/Vector.h>
namespace WebCore {
class HRTFKernel;
class HRTFDatabase final {
WTF_MAKE_FAST_ALLOCATED;
WTF_MAKE_NONCOPYABLE(HRTFDatabase);
public:
explicit HRTFDatabase(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 { 10 };
private:
// Minimum and maximum elevation angles (inclusive) for a HRTFDatabase.
static constexpr int MinElevation { -45 };
static constexpr int MaxElevation { 90 };
static constexpr unsigned RawElevationAngleSpacing { 15 };
// Interpolates by this factor to get the total number of elevations from every elevation loaded from resource.
static constexpr unsigned InterpolationFactor { 1 };
// Total number of elevations after interpolation.
static constexpr unsigned NumberOfTotalElevations { NumberOfRawElevations * InterpolationFactor };
// Returns the index for the correct HRTFElevation given the elevation angle.
static unsigned indexFromElevationAngle(double);
Vector<std::unique_ptr<HRTFElevation>> m_elevations { NumberOfTotalElevations };
float m_sampleRate;
};
} // namespace WebCore
#endif // HRTFDatabase_h