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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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. 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 INC. 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 HRTFPanner_h
#define HRTFPanner_h
#include "DelayDSPKernel.h"
#include "FFTConvolver.h"
#include "Panner.h"
namespace WebCore {
class HRTFPanner : public Panner {
public:
explicit HRTFPanner(double sampleRate);
virtual ~HRTFPanner();
// Panner
virtual void pan(double azimuth, double elevation, AudioBus* inputBus, AudioBus* outputBus, size_t framesToProcess);
virtual void reset();
size_t fftSize() { return fftSizeForSampleRate(m_sampleRate); }
static size_t fftSizeForSampleRate(double sampleRate);
double sampleRate() const { return m_sampleRate; }
private:
// Given an azimuth angle in the range -180 -> +180, returns the corresponding azimuth index for the database,
// and azimuthBlend which is an interpolation value from 0 -> 1.
int calculateDesiredAzimuthIndexAndBlend(double azimuth, double& azimuthBlend);
double m_sampleRate;
// m_isFirstRender and m_azimuthIndex are used to avoid harshly changing from rendering at one azimuth angle to another angle very far away.
// Changing the azimuth gradually produces a smoother sound.
bool m_isFirstRender;
int m_azimuthIndex;
FFTConvolver m_convolverL;
FFTConvolver m_convolverR;
DelayDSPKernel m_delayLineL;
DelayDSPKernel m_delayLineR;
};
} // namespace WebCore
#endif // HRTFPanner_h
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