mirror of
https://github.com/classilla/tenfourfox.git
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120 lines
4.7 KiB
C++
120 lines
4.7 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 Computer, 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 HRTFKernel_h
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#define HRTFKernel_h
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#include "nsAutoPtr.h"
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#include "nsAutoRef.h"
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#include "nsTArray.h"
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#include "mozilla/FFTBlock.h"
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#include "mozilla/MemoryReporting.h"
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namespace WebCore {
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using mozilla::FFTBlock;
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// HRTF stands for Head-Related Transfer Function.
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// HRTFKernel is a frequency-domain representation of an impulse-response used as part of the spatialized panning system.
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// For a given azimuth / elevation angle there will be one HRTFKernel for the left ear transfer function, and one for the right ear.
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// The leading delay (average group delay) for each impulse response is extracted:
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// m_fftFrame is the frequency-domain representation of the impulse response with the delay removed
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// m_frameDelay is the leading delay of the original impulse response.
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class HRTFKernel {
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public:
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// Note: this is destructive on the passed in |impulseResponse|.
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// The |length| of |impulseResponse| must be a power of two.
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// The size of the DFT will be |2 * length|.
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static nsReturnRef<HRTFKernel> create(float* impulseResponse, size_t length, float sampleRate);
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static nsReturnRef<HRTFKernel> create(nsAutoPtr<FFTBlock> fftFrame, float frameDelay, float sampleRate);
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// Given two HRTFKernels, and an interpolation factor x: 0 -> 1, returns an interpolated HRTFKernel.
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static nsReturnRef<HRTFKernel> createInterpolatedKernel(HRTFKernel* kernel1, HRTFKernel* kernel2, float x);
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FFTBlock* fftFrame() { return m_fftFrame.get(); }
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size_t fftSize() const { return m_fftFrame->FFTSize(); }
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float frameDelay() const { return m_frameDelay; }
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float sampleRate() const { return m_sampleRate; }
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double nyquist() const { return 0.5 * sampleRate(); }
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size_t sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
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{
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size_t amount = aMallocSizeOf(this);
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amount += m_fftFrame->SizeOfIncludingThis(aMallocSizeOf);
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return amount;
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}
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private:
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HRTFKernel(const HRTFKernel& other) = delete;
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void operator=(const HRTFKernel& other) = delete;
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// Note: this is destructive on the passed in |impulseResponse|.
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HRTFKernel(float* impulseResponse, size_t fftSize, float sampleRate);
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HRTFKernel(nsAutoPtr<FFTBlock> fftFrame, float frameDelay, float sampleRate)
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: m_fftFrame(fftFrame)
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, m_frameDelay(frameDelay)
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, m_sampleRate(sampleRate)
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{
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}
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nsAutoPtr<FFTBlock> m_fftFrame;
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float m_frameDelay;
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float m_sampleRate;
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};
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typedef nsTArray<nsAutoRef<HRTFKernel> > HRTFKernelList;
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} // namespace WebCore
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template <>
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class nsAutoRefTraits<WebCore::HRTFKernel> :
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public nsPointerRefTraits<WebCore::HRTFKernel> {
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public:
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static void Release(WebCore::HRTFKernel* ptr) { delete(ptr); }
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};
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namespace WebCore {
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inline nsReturnRef<HRTFKernel> HRTFKernel::create(float* impulseResponse, size_t length, float sampleRate)
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{
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return nsReturnRef<HRTFKernel>(new HRTFKernel(impulseResponse, length, sampleRate));
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}
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inline nsReturnRef<HRTFKernel> HRTFKernel::create(nsAutoPtr<FFTBlock> fftFrame, float frameDelay, float sampleRate)
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{
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return nsReturnRef<HRTFKernel>(new HRTFKernel(fftFrame, frameDelay, sampleRate));
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}
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} // namespace WebCore
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#endif // HRTFKernel_h
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