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comparison: content/media/webaudio/blink/HRTFKernel.h
content/media/webaudio/blink/HRTFKernel.h
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| 1 /* | |
| 2 * Copyright (C) 2010 Google Inc. All rights reserved. | |
| 3 * | |
| 4 * Redistribution and use in source and binary forms, with or without | |
| 5 * modification, are permitted provided that the following conditions | |
| 6 * are met: | |
| 7 * | |
| 8 * 1. Redistributions of source code must retain the above copyright | |
| 9 * notice, this list of conditions and the following disclaimer. | |
| 10 * 2. Redistributions in binary form must reproduce the above copyright | |
| 11 * notice, this list of conditions and the following disclaimer in the | |
| 12 * documentation and/or other materials provided with the distribution. | |
| 13 * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of | |
| 14 * its contributors may be used to endorse or promote products derived | |
| 15 * from this software without specific prior written permission. | |
| 16 * | |
| 17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY | |
| 18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | |
| 19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
| 20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY | |
| 21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | |
| 22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
| 23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND | |
| 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
| 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 27 */ | |
| 28 | |
| 29 #ifndef HRTFKernel_h | |
| 30 #define HRTFKernel_h | |
| 31 | |
| 32 #include "nsAutoPtr.h" | |
| 33 #include "nsAutoRef.h" | |
| 34 #include "nsTArray.h" | |
| 35 #include "mozilla/FFTBlock.h" | |
| 36 #include "mozilla/MemoryReporting.h" | |
| 37 | |
| 38 namespace WebCore { | |
| 39 | |
| 40 using mozilla::FFTBlock; | |
| 41 | |
| 42 // HRTF stands for Head-Related Transfer Function. | |
| 43 // HRTFKernel is a frequency-domain representation of an impulse-response used as part of the spatialized panning system. | |
| 44 // For a given azimuth / elevation angle there will be one HRTFKernel for the left ear transfer function, and one for the right ear. | |
| 45 // The leading delay (average group delay) for each impulse response is extracted: | |
| 46 // m_fftFrame is the frequency-domain representation of the impulse response with the delay removed | |
| 47 // m_frameDelay is the leading delay of the original impulse response. | |
| 48 class HRTFKernel { | |
| 49 public: | |
| 50 // Note: this is destructive on the passed in |impulseResponse|. | |
| 51 // The |length| of |impulseResponse| must be a power of two. | |
| 52 // The size of the DFT will be |2 * length|. | |
| 53 static nsReturnRef<HRTFKernel> create(float* impulseResponse, size_t length, float sampleRate); | |
| 54 | |
| 55 static nsReturnRef<HRTFKernel> create(nsAutoPtr<FFTBlock> fftFrame, float frameDelay, float sampleRate); | |
| 56 | |
| 57 // Given two HRTFKernels, and an interpolation factor x: 0 -> 1, returns an interpolated HRTFKernel. | |
| 58 static nsReturnRef<HRTFKernel> createInterpolatedKernel(HRTFKernel* kernel1, HRTFKernel* kernel2, float x); | |
| 59 | |
| 60 FFTBlock* fftFrame() { return m_fftFrame.get(); } | |
| 61 | |
| 62 size_t fftSize() const { return m_fftFrame->FFTSize(); } | |
| 63 float frameDelay() const { return m_frameDelay; } | |
| 64 | |
| 65 float sampleRate() const { return m_sampleRate; } | |
| 66 double nyquist() const { return 0.5 * sampleRate(); } | |
| 67 | |
| 68 size_t sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const | |
| 69 { | |
| 70 size_t amount = aMallocSizeOf(this); | |
| 71 amount += m_fftFrame->SizeOfIncludingThis(aMallocSizeOf); | |
| 72 return amount; | |
| 73 } | |
| 74 | |
| 75 private: | |
| 76 HRTFKernel(const HRTFKernel& other) MOZ_DELETE; | |
| 77 void operator=(const HRTFKernel& other) MOZ_DELETE; | |
| 78 | |
| 79 // Note: this is destructive on the passed in |impulseResponse|. | |
| 80 HRTFKernel(float* impulseResponse, size_t fftSize, float sampleRate); | |
| 81 | |
| 82 HRTFKernel(nsAutoPtr<FFTBlock> fftFrame, float frameDelay, float sampleRate) | |
| 83 : m_fftFrame(fftFrame) | |
| 84 , m_frameDelay(frameDelay) | |
| 85 , m_sampleRate(sampleRate) | |
| 86 { | |
| 87 } | |
| 88 | |
| 89 nsAutoPtr<FFTBlock> m_fftFrame; | |
| 90 float m_frameDelay; | |
| 91 float m_sampleRate; | |
| 92 }; | |
| 93 | |
| 94 typedef nsTArray<nsAutoRef<HRTFKernel> > HRTFKernelList; | |
| 95 | |
| 96 } // namespace WebCore | |
| 97 | |
| 98 template <> | |
| 99 class nsAutoRefTraits<WebCore::HRTFKernel> : | |
| 100 public nsPointerRefTraits<WebCore::HRTFKernel> { | |
| 101 public: | |
| 102 static void Release(WebCore::HRTFKernel* ptr) { delete(ptr); } | |
| 103 }; | |
| 104 | |
| 105 namespace WebCore { | |
| 106 | |
| 107 inline nsReturnRef<HRTFKernel> HRTFKernel::create(float* impulseResponse, size_t length, float sampleRate) | |
| 108 { | |
| 109 return nsReturnRef<HRTFKernel>(new HRTFKernel(impulseResponse, length, sampleRate)); | |
| 110 } | |
| 111 | |
| 112 inline nsReturnRef<HRTFKernel> HRTFKernel::create(nsAutoPtr<FFTBlock> fftFrame, float frameDelay, float sampleRate) | |
| 113 { | |
| 114 return nsReturnRef<HRTFKernel>(new HRTFKernel(fftFrame, frameDelay, sampleRate)); | |
| 115 } | |
| 116 | |
| 117 } // namespace WebCore | |
| 118 #endif // HRTFKernel_h |
