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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 "HRTFKernel.h"
#include "nsAutoRef.h"
#include "mozilla/MemoryReporting.h"
struct SpeexResamplerState_;
typedef struct SpeexResamplerState_ SpeexResamplerState;
namespace WebCore {
// HRTFElevation contains all of the HRTFKernels (one left ear and one right ear per azimuth angle) for a particular elevation.
class 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 nsReturnRef<HRTFElevation> createBuiltin(int elevation, float sampleRate);
// Given two HRTFElevations, and an interpolation factor x: 0 -> 1, returns an interpolated HRTFElevation.
static nsReturnRef<HRTFElevation> createByInterpolatingSlices(HRTFElevation* hrtfElevation1, HRTFElevation* hrtfElevation2, float x, float sampleRate);
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);
// Total number of azimuths after interpolation.
static const unsigned NumberOfTotalAzimuths;
static size_t fftSizeForSampleRate(float sampleRate);
size_t sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
private:
HRTFElevation(const HRTFElevation& other) = delete;
void operator=(const HRTFElevation& other) = delete;
HRTFElevation(HRTFKernelList *kernelListL, int elevation, float sampleRate)
: m_elevationAngle(elevation)
, m_sampleRate(sampleRate)
{
m_kernelListL.SwapElements(*kernelListL);
}
// Returns the list of left ear HRTFKernels for all the azimuths going from 0 to 360 degrees.
const HRTFKernelList& kernelListL() { return m_kernelListL; }
// Given a specific azimuth and elevation angle, returns the left HRTFKernel.
// Values for azimuth must be multiples of 15 in 0 -> 345,
// but not all azimuths are available for elevations > +45.
// Valid values for elevation are -45 -> +90 in 15 degree increments.
static nsReturnRef<HRTFKernel> calculateKernelForAzimuthElevation(int azimuth, int elevation, SpeexResamplerState* resampler, float sampleRate);
HRTFKernelList m_kernelListL;
double m_elevationAngle;
float m_sampleRate;
};
} // namespace WebCore
template <>
class nsAutoRefTraits<WebCore::HRTFElevation> :
public nsPointerRefTraits<WebCore::HRTFElevation> {
public:
static void Release(WebCore::HRTFElevation* ptr) { delete(ptr); }
};
#endif // HRTFElevation_h
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