/content/media/webaudio/blink/HRTFKernel.h
C Header | 118 lines | 58 code | 22 blank | 38 comment | 0 complexity | 26bed2717b87accdd0e721bbb4a55b83 MD5 | raw file
Possible License(s): Apache-2.0, 0BSD, LGPL-3.0, MPL-2.0-no-copyleft-exception, MPL-2.0, BSD-3-Clause, GPL-2.0, JSON, LGPL-2.1
- /*
- * 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 HRTFKernel_h
- #define HRTFKernel_h
- #include "nsAutoPtr.h"
- #include "nsAutoRef.h"
- #include "nsTArray.h"
- #include "mozilla/FFTBlock.h"
- #include "mozilla/MemoryReporting.h"
- namespace WebCore {
- using mozilla::FFTBlock;
- // HRTF stands for Head-Related Transfer Function.
- // HRTFKernel is a frequency-domain representation of an impulse-response used as part of the spatialized panning system.
- // For a given azimuth / elevation angle there will be one HRTFKernel for the left ear transfer function, and one for the right ear.
- // The leading delay (average group delay) for each impulse response is extracted:
- // m_fftFrame is the frequency-domain representation of the impulse response with the delay removed
- // m_frameDelay is the leading delay of the original impulse response.
- class HRTFKernel {
- public:
- // Note: this is destructive on the passed in |impulseResponse|.
- // The |length| of |impulseResponse| must be a power of two.
- // The size of the DFT will be |2 * length|.
- static nsReturnRef<HRTFKernel> create(float* impulseResponse, size_t length, float sampleRate);
- static nsReturnRef<HRTFKernel> create(nsAutoPtr<FFTBlock> fftFrame, float frameDelay, float sampleRate);
- // Given two HRTFKernels, and an interpolation factor x: 0 -> 1, returns an interpolated HRTFKernel.
- static nsReturnRef<HRTFKernel> createInterpolatedKernel(HRTFKernel* kernel1, HRTFKernel* kernel2, float x);
-
- FFTBlock* fftFrame() { return m_fftFrame.get(); }
-
- size_t fftSize() const { return m_fftFrame->FFTSize(); }
- float frameDelay() const { return m_frameDelay; }
- float sampleRate() const { return m_sampleRate; }
- double nyquist() const { return 0.5 * sampleRate(); }
- size_t sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
- {
- size_t amount = aMallocSizeOf(this);
- amount += m_fftFrame->SizeOfIncludingThis(aMallocSizeOf);
- return amount;
- }
- private:
- HRTFKernel(const HRTFKernel& other) MOZ_DELETE;
- void operator=(const HRTFKernel& other) MOZ_DELETE;
- // Note: this is destructive on the passed in |impulseResponse|.
- HRTFKernel(float* impulseResponse, size_t fftSize, float sampleRate);
-
- HRTFKernel(nsAutoPtr<FFTBlock> fftFrame, float frameDelay, float sampleRate)
- : m_fftFrame(fftFrame)
- , m_frameDelay(frameDelay)
- , m_sampleRate(sampleRate)
- {
- }
-
- nsAutoPtr<FFTBlock> m_fftFrame;
- float m_frameDelay;
- float m_sampleRate;
- };
- typedef nsTArray<nsAutoRef<HRTFKernel> > HRTFKernelList;
- } // namespace WebCore
- template <>
- class nsAutoRefTraits<WebCore::HRTFKernel> :
- public nsPointerRefTraits<WebCore::HRTFKernel> {
- public:
- static void Release(WebCore::HRTFKernel* ptr) { delete(ptr); }
- };
- namespace WebCore {
- inline nsReturnRef<HRTFKernel> HRTFKernel::create(float* impulseResponse, size_t length, float sampleRate)
- {
- return nsReturnRef<HRTFKernel>(new HRTFKernel(impulseResponse, length, sampleRate));
- }
- inline nsReturnRef<HRTFKernel> HRTFKernel::create(nsAutoPtr<FFTBlock> fftFrame, float frameDelay, float sampleRate)
- {
- return nsReturnRef<HRTFKernel>(new HRTFKernel(fftFrame, frameDelay, sampleRate));
- }
- } // namespace WebCore
- #endif // HRTFKernel_h