content/media/webaudio/blink/HRTFKernel.h@6474c204b198 (annotated)
content/media/webaudio/blink/HRTFKernel.h
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | /* |
| michael@0 | 2 | * Copyright (C) 2010 Google Inc. All rights reserved. |
| michael@0 | 3 | * |
| michael@0 | 4 | * Redistribution and use in source and binary forms, with or without |
| michael@0 | 5 | * modification, are permitted provided that the following conditions |
| michael@0 | 6 | * are met: |
| michael@0 | 7 | * |
| michael@0 | 8 | * 1. Redistributions of source code must retain the above copyright |
| michael@0 | 9 | * notice, this list of conditions and the following disclaimer. |
| michael@0 | 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| michael@0 | 11 | * notice, this list of conditions and the following disclaimer in the |
| michael@0 | 12 | * documentation and/or other materials provided with the distribution. |
| michael@0 | 13 | * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of |
| michael@0 | 14 | * its contributors may be used to endorse or promote products derived |
| michael@0 | 15 | * from this software without specific prior written permission. |
| michael@0 | 16 | * |
| michael@0 | 17 | * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY |
| michael@0 | 18 | * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| michael@0 | 19 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| michael@0 | 20 | * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY |
| michael@0 | 21 | * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| michael@0 | 22 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| michael@0 | 23 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| michael@0 | 24 | * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| michael@0 | 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| michael@0 | 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| michael@0 | 27 | */ |
| michael@0 | 28 | |
| michael@0 | 29 | #ifndef HRTFKernel_h |
| michael@0 | 30 | #define HRTFKernel_h |
| michael@0 | 31 | |
| michael@0 | 32 | #include "nsAutoPtr.h" |
| michael@0 | 33 | #include "nsAutoRef.h" |
| michael@0 | 34 | #include "nsTArray.h" |
| michael@0 | 35 | #include "mozilla/FFTBlock.h" |
| michael@0 | 36 | #include "mozilla/MemoryReporting.h" |
| michael@0 | 37 | |
| michael@0 | 38 | namespace WebCore { |
| michael@0 | 39 | |
| michael@0 | 40 | using mozilla::FFTBlock; |
| michael@0 | 41 | |
| michael@0 | 42 | // HRTF stands for Head-Related Transfer Function. |
| michael@0 | 43 | // HRTFKernel is a frequency-domain representation of an impulse-response used as part of the spatialized panning system. |
| michael@0 | 44 | // For a given azimuth / elevation angle there will be one HRTFKernel for the left ear transfer function, and one for the right ear. |
| michael@0 | 45 | // The leading delay (average group delay) for each impulse response is extracted: |
| michael@0 | 46 | // m_fftFrame is the frequency-domain representation of the impulse response with the delay removed |
| michael@0 | 47 | // m_frameDelay is the leading delay of the original impulse response. |
| michael@0 | 48 | class HRTFKernel { |
| michael@0 | 49 | public: |
| michael@0 | 50 | // Note: this is destructive on the passed in |impulseResponse|. |
| michael@0 | 51 | // The |length| of |impulseResponse| must be a power of two. |
| michael@0 | 52 | // The size of the DFT will be |2 * length|. |
| michael@0 | 53 | static nsReturnRef<HRTFKernel> create(float* impulseResponse, size_t length, float sampleRate); |
| michael@0 | 54 | |
| michael@0 | 55 | static nsReturnRef<HRTFKernel> create(nsAutoPtr<FFTBlock> fftFrame, float frameDelay, float sampleRate); |
| michael@0 | 56 | |
| michael@0 | 57 | // Given two HRTFKernels, and an interpolation factor x: 0 -> 1, returns an interpolated HRTFKernel. |
| michael@0 | 58 | static nsReturnRef<HRTFKernel> createInterpolatedKernel(HRTFKernel* kernel1, HRTFKernel* kernel2, float x); |
| michael@0 | 59 | |
| michael@0 | 60 | FFTBlock* fftFrame() { return m_fftFrame.get(); } |
| michael@0 | 61 | |
| michael@0 | 62 | size_t fftSize() const { return m_fftFrame->FFTSize(); } |
| michael@0 | 63 | float frameDelay() const { return m_frameDelay; } |
| michael@0 | 64 | |
| michael@0 | 65 | float sampleRate() const { return m_sampleRate; } |
| michael@0 | 66 | double nyquist() const { return 0.5 * sampleRate(); } |
| michael@0 | 67 | |
| michael@0 | 68 | size_t sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const |
| michael@0 | 69 | { |
| michael@0 | 70 | size_t amount = aMallocSizeOf(this); |
| michael@0 | 71 | amount += m_fftFrame->SizeOfIncludingThis(aMallocSizeOf); |
| michael@0 | 72 | return amount; |
| michael@0 | 73 | } |
| michael@0 | 74 | |
| michael@0 | 75 | private: |
| michael@0 | 76 | HRTFKernel(const HRTFKernel& other) MOZ_DELETE; |
| michael@0 | 77 | void operator=(const HRTFKernel& other) MOZ_DELETE; |
| michael@0 | 78 | |
| michael@0 | 79 | // Note: this is destructive on the passed in |impulseResponse|. |
| michael@0 | 80 | HRTFKernel(float* impulseResponse, size_t fftSize, float sampleRate); |
| michael@0 | 81 | |
| michael@0 | 82 | HRTFKernel(nsAutoPtr<FFTBlock> fftFrame, float frameDelay, float sampleRate) |
| michael@0 | 83 | : m_fftFrame(fftFrame) |
| michael@0 | 84 | , m_frameDelay(frameDelay) |
| michael@0 | 85 | , m_sampleRate(sampleRate) |
| michael@0 | 86 | { |
| michael@0 | 87 | } |
| michael@0 | 88 | |
| michael@0 | 89 | nsAutoPtr<FFTBlock> m_fftFrame; |
| michael@0 | 90 | float m_frameDelay; |
| michael@0 | 91 | float m_sampleRate; |
| michael@0 | 92 | }; |
| michael@0 | 93 | |
| michael@0 | 94 | typedef nsTArray<nsAutoRef<HRTFKernel> > HRTFKernelList; |
| michael@0 | 95 | |
| michael@0 | 96 | } // namespace WebCore |
| michael@0 | 97 | |
| michael@0 | 98 | template <> |
| michael@0 | 99 | class nsAutoRefTraits<WebCore::HRTFKernel> : |
| michael@0 | 100 | public nsPointerRefTraits<WebCore::HRTFKernel> { |
| michael@0 | 101 | public: |
| michael@0 | 102 | static void Release(WebCore::HRTFKernel* ptr) { delete(ptr); } |
| michael@0 | 103 | }; |
| michael@0 | 104 | |
| michael@0 | 105 | namespace WebCore { |
| michael@0 | 106 | |
| michael@0 | 107 | inline nsReturnRef<HRTFKernel> HRTFKernel::create(float* impulseResponse, size_t length, float sampleRate) |
| michael@0 | 108 | { |
| michael@0 | 109 | return nsReturnRef<HRTFKernel>(new HRTFKernel(impulseResponse, length, sampleRate)); |
| michael@0 | 110 | } |
| michael@0 | 111 | |
| michael@0 | 112 | inline nsReturnRef<HRTFKernel> HRTFKernel::create(nsAutoPtr<FFTBlock> fftFrame, float frameDelay, float sampleRate) |
| michael@0 | 113 | { |
| michael@0 | 114 | return nsReturnRef<HRTFKernel>(new HRTFKernel(fftFrame, frameDelay, sampleRate)); |
| michael@0 | 115 | } |
| michael@0 | 116 | |
| michael@0 | 117 | } // namespace WebCore |
| michael@0 | 118 | #endif // HRTFKernel_h |
