content/media/webaudio/blink/HRTFElevation.h@b8a032363ba2 (annotated)
content/media/webaudio/blink/HRTFElevation.h
Thu, 22 Jan 2015 13:21:57 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 22 Jan 2015 13:21:57 +0100
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
- permissions
- -rw-r--r--
Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6
| 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 HRTFElevation_h |
| michael@0 | 30 | #define HRTFElevation_h |
| michael@0 | 31 | |
| michael@0 | 32 | #include "HRTFKernel.h" |
| michael@0 | 33 | #include "nsAutoRef.h" |
| michael@0 | 34 | #include "mozilla/MemoryReporting.h" |
| michael@0 | 35 | |
| michael@0 | 36 | struct SpeexResamplerState_; |
| michael@0 | 37 | typedef struct SpeexResamplerState_ SpeexResamplerState; |
| michael@0 | 38 | |
| michael@0 | 39 | namespace WebCore { |
| michael@0 | 40 | |
| michael@0 | 41 | // HRTFElevation contains all of the HRTFKernels (one left ear and one right ear per azimuth angle) for a particular elevation. |
| michael@0 | 42 | |
| michael@0 | 43 | class HRTFElevation { |
| michael@0 | 44 | public: |
| michael@0 | 45 | // Loads and returns an HRTFElevation with the given HRTF database subject name and elevation from browser (or WebKit.framework) resources. |
| michael@0 | 46 | // Normally, there will only be a single HRTF database set, but this API supports the possibility of multiple ones with different names. |
| michael@0 | 47 | // Interpolated azimuths will be generated based on InterpolationFactor. |
| michael@0 | 48 | // Valid values for elevation are -45 -> +90 in 15 degree increments. |
| michael@0 | 49 | static nsReturnRef<HRTFElevation> createBuiltin(int elevation, float sampleRate); |
| michael@0 | 50 | |
| michael@0 | 51 | // Given two HRTFElevations, and an interpolation factor x: 0 -> 1, returns an interpolated HRTFElevation. |
| michael@0 | 52 | static nsReturnRef<HRTFElevation> createByInterpolatingSlices(HRTFElevation* hrtfElevation1, HRTFElevation* hrtfElevation2, float x, float sampleRate); |
| michael@0 | 53 | |
| michael@0 | 54 | double elevationAngle() const { return m_elevationAngle; } |
| michael@0 | 55 | unsigned numberOfAzimuths() const { return NumberOfTotalAzimuths; } |
| michael@0 | 56 | float sampleRate() const { return m_sampleRate; } |
| michael@0 | 57 | |
| michael@0 | 58 | // Returns the left and right kernels for the given azimuth index. |
| michael@0 | 59 | // The interpolated delays based on azimuthBlend: 0 -> 1 are returned in frameDelayL and frameDelayR. |
| michael@0 | 60 | void getKernelsFromAzimuth(double azimuthBlend, unsigned azimuthIndex, HRTFKernel* &kernelL, HRTFKernel* &kernelR, double& frameDelayL, double& frameDelayR); |
| michael@0 | 61 | |
| michael@0 | 62 | // Total number of azimuths after interpolation. |
| michael@0 | 63 | static const unsigned NumberOfTotalAzimuths; |
| michael@0 | 64 | |
| michael@0 | 65 | static size_t fftSizeForSampleRate(float sampleRate); |
| michael@0 | 66 | |
| michael@0 | 67 | size_t sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const; |
| michael@0 | 68 | |
| michael@0 | 69 | private: |
| michael@0 | 70 | HRTFElevation(const HRTFElevation& other) MOZ_DELETE; |
| michael@0 | 71 | void operator=(const HRTFElevation& other) MOZ_DELETE; |
| michael@0 | 72 | |
| michael@0 | 73 | HRTFElevation(HRTFKernelList *kernelListL, int elevation, float sampleRate) |
| michael@0 | 74 | : m_elevationAngle(elevation) |
| michael@0 | 75 | , m_sampleRate(sampleRate) |
| michael@0 | 76 | { |
| michael@0 | 77 | m_kernelListL.SwapElements(*kernelListL); |
| michael@0 | 78 | } |
| michael@0 | 79 | |
| michael@0 | 80 | // Returns the list of left ear HRTFKernels for all the azimuths going from 0 to 360 degrees. |
| michael@0 | 81 | const HRTFKernelList& kernelListL() { return m_kernelListL; } |
| michael@0 | 82 | |
| michael@0 | 83 | // Given a specific azimuth and elevation angle, returns the left HRTFKernel. |
| michael@0 | 84 | // Values for azimuth must be multiples of 15 in 0 -> 345, |
| michael@0 | 85 | // but not all azimuths are available for elevations > +45. |
| michael@0 | 86 | // Valid values for elevation are -45 -> +90 in 15 degree increments. |
| michael@0 | 87 | static nsReturnRef<HRTFKernel> calculateKernelForAzimuthElevation(int azimuth, int elevation, SpeexResamplerState* resampler, float sampleRate); |
| michael@0 | 88 | |
| michael@0 | 89 | HRTFKernelList m_kernelListL; |
| michael@0 | 90 | double m_elevationAngle; |
| michael@0 | 91 | float m_sampleRate; |
| michael@0 | 92 | }; |
| michael@0 | 93 | |
| michael@0 | 94 | } // namespace WebCore |
| michael@0 | 95 | |
| michael@0 | 96 | template <> |
| michael@0 | 97 | class nsAutoRefTraits<WebCore::HRTFElevation> : |
| michael@0 | 98 | public nsPointerRefTraits<WebCore::HRTFElevation> { |
| michael@0 | 99 | public: |
| michael@0 | 100 | static void Release(WebCore::HRTFElevation* ptr) { delete(ptr); } |
| michael@0 | 101 | }; |
| michael@0 | 102 | |
| michael@0 | 103 | #endif // HRTFElevation_h |
