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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.
* 3. Neither the name of Apple Computer, 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
* 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 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 HRTFElevation_h
#define HRTFElevation_h
#include "platform/audio/HRTFKernel.h"
#include "wtf/Allocator.h"
#include "wtf/Noncopyable.h"
#include "wtf/PassRefPtr.h"
#include "wtf/RefPtr.h"
#include "wtf/text/CString.h"
#include "wtf/text/WTFString.h"
#include <memory>
namespace blink {
// HRTFElevation contains all of the HRTFKernels (one left ear and one right ear
// per azimuth angle) for a particular elevation.
class PLATFORM_EXPORT HRTFElevation {
USING_FAST_MALLOC(HRTFElevation);
WTF_MAKE_NONCOPYABLE(HRTFElevation);
public:
// Loads and returns an HRTFElevation with the given HRTF database subject
// name and elevation from browser (or WebKit.framework) resources.
// Normally, there will only be a single HRTF database set, but this API
// supports the possibility of multiple ones with different names.
// Interpolated azimuths will be generated based on InterpolationFactor.
// Valid values for elevation are -45 -> +90 in 15 degree increments.
static std::unique_ptr<HRTFElevation>
createForSubject(const String& subjectName, int elevation, float sampleRate);
// Given two HRTFElevations, and an interpolation factor x: 0 -> 1, returns an
// interpolated HRTFElevation.
static std::unique_ptr<HRTFElevation> createByInterpolatingSlices(
HRTFElevation* hrtfElevation1,
HRTFElevation* hrtfElevation2,
float x,
float sampleRate);
// Returns the list of left or right ear HRTFKernels for all the azimuths
// going from 0 to 360 degrees.
HRTFKernelList* kernelListL() { return m_kernelListL.get(); }
HRTFKernelList* kernelListR() { return m_kernelListR.get(); }
double elevationAngle() const { return m_elevationAngle; }
unsigned numberOfAzimuths() const { return NumberOfTotalAzimuths; }
float sampleRate() const { return m_sampleRate; }
// Returns the left and right kernels for the given azimuth index.
// The interpolated delays based on azimuthBlend: 0 -> 1 are returned in
// frameDelayL and frameDelayR.
void getKernelsFromAzimuth(double azimuthBlend,
unsigned azimuthIndex,
HRTFKernel*& kernelL,
HRTFKernel*& kernelR,
double& frameDelayL,
double& frameDelayR);
// Spacing, in degrees, between every azimuth loaded from resource.
static const unsigned AzimuthSpacing;
// Number of azimuths loaded from resource.
static const unsigned NumberOfRawAzimuths;
// Interpolates by this factor to get the total number of azimuths from every
// azimuth loaded from resource.
static const unsigned InterpolationFactor;
// Total number of azimuths after interpolation.
static const unsigned NumberOfTotalAzimuths;
// Given a specific azimuth and elevation angle, returns the left and right
// HRTFKernel.
// Valid values for azimuth are 0 -> 345 in 15 degree increments.
// Valid values for elevation are -45 -> +90 in 15 degree increments.
// Returns true on success.
static bool calculateKernelsForAzimuthElevation(
int azimuth,
int elevation,
float sampleRate,
const String& subjectName,
std::unique_ptr<HRTFKernel>& kernelL,
std::unique_ptr<HRTFKernel>& kernelR);
private:
HRTFElevation(std::unique_ptr<HRTFKernelList> kernelListL,
std::unique_ptr<HRTFKernelList> kernelListR,
int elevation,
float sampleRate)
: m_kernelListL(std::move(kernelListL)),
m_kernelListR(std::move(kernelListR)),
m_elevationAngle(elevation),
m_sampleRate(sampleRate) {}
std::unique_ptr<HRTFKernelList> m_kernelListL;
std::unique_ptr<HRTFKernelList> m_kernelListR;
double m_elevationAngle;
float m_sampleRate;
};
} // namespace blink
#endif // HRTFElevation_h
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