110 lines
5.6 KiB
C++
110 lines
5.6 KiB
C++
/*
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* Copyright (C) 2010 Google Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of Apple Inc. ("Apple") nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef HRTFElevation_h
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#define HRTFElevation_h
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#include "HRTFKernel.h"
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#include <memory>
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#include <wtf/Noncopyable.h>
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#include <wtf/RefPtr.h>
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#include <wtf/text/WTFString.h>
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namespace WebCore {
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// HRTFElevation contains all of the HRTFKernels (one left ear and one right ear per azimuth angle) for a particular elevation.
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class HRTFElevation final {
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WTF_MAKE_FAST_ALLOCATED;
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WTF_MAKE_NONCOPYABLE(HRTFElevation);
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public:
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HRTFElevation(std::unique_ptr<HRTFKernelList> kernelListL, std::unique_ptr<HRTFKernelList> kernelListR, int elevation, float sampleRate)
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: m_kernelListL(WTFMove(kernelListL))
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, m_kernelListR(WTFMove(kernelListR))
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, m_elevationAngle(elevation)
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, m_sampleRate(sampleRate)
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{
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}
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// Loads and returns an HRTFElevation with the given HRTF database subject name and elevation from browser (or WebKit.framework) resources.
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// Normally, there will only be a single HRTF database set, but this API supports the possibility of multiple ones with different names.
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// Interpolated azimuths will be generated based on InterpolationFactor.
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// Valid values for elevation are -45 -> +90 in 15 degree increments.
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static std::unique_ptr<HRTFElevation> createForSubject(const String& subjectName, int elevation, float sampleRate);
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// Given two HRTFElevations, and an interpolation factor x: 0 -> 1, returns an interpolated HRTFElevation.
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static std::unique_ptr<HRTFElevation> createByInterpolatingSlices(HRTFElevation* hrtfElevation1, HRTFElevation* hrtfElevation2, float x, float sampleRate);
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// Returns the list of left or right ear HRTFKernels for all the azimuths going from 0 to 360 degrees.
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HRTFKernelList* kernelListL() { return m_kernelListL.get(); }
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HRTFKernelList* kernelListR() { return m_kernelListR.get(); }
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double elevationAngle() const { return m_elevationAngle; }
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unsigned numberOfAzimuths() const { return NumberOfTotalAzimuths; }
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float sampleRate() const { return m_sampleRate; }
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// Returns the left and right kernels for the given azimuth index.
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// The interpolated delays based on azimuthBlend: 0 -> 1 are returned in frameDelayL and frameDelayR.
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void getKernelsFromAzimuth(double azimuthBlend, unsigned azimuthIndex, HRTFKernel* &kernelL, HRTFKernel* &kernelR, double& frameDelayL, double& frameDelayR);
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// Spacing, in degrees, between every azimuth loaded from resource.
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static constexpr unsigned AzimuthSpacing { 15 };
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// Number of azimuths loaded from resource.
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static constexpr unsigned NumberOfRawAzimuths { 360 / AzimuthSpacing };
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// Interpolates by this factor to get the total number of azimuths from every azimuth loaded from resource.
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static constexpr unsigned InterpolationFactor { 8 };
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// Total number of azimuths after interpolation.
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static constexpr unsigned NumberOfTotalAzimuths { NumberOfRawAzimuths * InterpolationFactor };
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// Given a specific azimuth and elevation angle, returns the left and right HRTFKernel.
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// Valid values for azimuth are 0 -> 345 in 15 degree increments.
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// Valid values for elevation are -45 -> +90 in 15 degree increments.
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// Returns true on success.
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static bool calculateKernelsForAzimuthElevation(int azimuth, int elevation, float sampleRate, const String& subjectName,
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RefPtr<HRTFKernel>& kernelL, RefPtr<HRTFKernel>& kernelR);
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// Given a specific azimuth and elevation angle, returns the left and right HRTFKernel in kernelL and kernelR.
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// This method averages the measured response using symmetry of azimuth (for example by averaging the -30.0 and +30.0 azimuth responses).
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// Returns true on success.
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static bool calculateSymmetricKernelsForAzimuthElevation(int azimuth, int elevation, float sampleRate, const String& subjectName,
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RefPtr<HRTFKernel>& kernelL, RefPtr<HRTFKernel>& kernelR);
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private:
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std::unique_ptr<HRTFKernelList> m_kernelListL;
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std::unique_ptr<HRTFKernelList> m_kernelListR;
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double m_elevationAngle;
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float m_sampleRate;
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};
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} // namespace WebCore
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#endif // HRTFElevation_h
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