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1 /* | 1 /* |
2 * Copyright (C) 2010 Google Inc. All rights reserved. | 2 * Copyright (C) 2010 Google Inc. All rights reserved. |
3 * | 3 * |
4 * Redistribution and use in source and binary forms, with or without | 4 * Redistribution and use in source and binary forms, with or without |
5 * modification, are permitted provided that the following conditions | 5 * modification, are permitted provided that the following conditions |
6 * are met: | 6 * are met: |
7 * | 7 * |
8 * 1. Redistributions of source code must retain the above copyright | 8 * 1. Redistributions of source code must retain the above copyright |
9 * notice, this list of conditions and the following disclaimer. | 9 * notice, this list of conditions and the following disclaimer. |
10 * 2. Redistributions in binary form must reproduce the above copyright | 10 * 2. Redistributions in binary form must reproduce the above copyright |
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33 #include "wtf/Allocator.h" | 33 #include "wtf/Allocator.h" |
34 #include "wtf/Noncopyable.h" | 34 #include "wtf/Noncopyable.h" |
35 #include "wtf/PassRefPtr.h" | 35 #include "wtf/PassRefPtr.h" |
36 #include "wtf/RefPtr.h" | 36 #include "wtf/RefPtr.h" |
37 #include "wtf/text/CString.h" | 37 #include "wtf/text/CString.h" |
38 #include "wtf/text/WTFString.h" | 38 #include "wtf/text/WTFString.h" |
39 #include <memory> | 39 #include <memory> |
40 | 40 |
41 namespace blink { | 41 namespace blink { |
42 | 42 |
43 // HRTFElevation contains all of the HRTFKernels (one left ear and one right ear
per azimuth angle) for a particular elevation. | 43 // HRTFElevation contains all of the HRTFKernels (one left ear and one right ear |
| 44 // per azimuth angle) for a particular elevation. |
44 | 45 |
45 class PLATFORM_EXPORT HRTFElevation { | 46 class PLATFORM_EXPORT HRTFElevation { |
46 USING_FAST_MALLOC(HRTFElevation); | 47 USING_FAST_MALLOC(HRTFElevation); |
47 WTF_MAKE_NONCOPYABLE(HRTFElevation); | 48 WTF_MAKE_NONCOPYABLE(HRTFElevation); |
48 | 49 |
49 public: | 50 public: |
50 // Loads and returns an HRTFElevation with the given HRTF database subject nam
e and elevation from browser (or WebKit.framework) resources. | 51 // Loads and returns an HRTFElevation with the given HRTF database subject |
51 // Normally, there will only be a single HRTF database set, but this API suppo
rts the possibility of multiple ones with different names. | 52 // name and elevation from browser (or WebKit.framework) resources. |
| 53 // Normally, there will only be a single HRTF database set, but this API |
| 54 // supports the possibility of multiple ones with different names. |
52 // Interpolated azimuths will be generated based on InterpolationFactor. | 55 // Interpolated azimuths will be generated based on InterpolationFactor. |
53 // Valid values for elevation are -45 -> +90 in 15 degree increments. | 56 // Valid values for elevation are -45 -> +90 in 15 degree increments. |
54 static std::unique_ptr<HRTFElevation> | 57 static std::unique_ptr<HRTFElevation> |
55 createForSubject(const String& subjectName, int elevation, float sampleRate); | 58 createForSubject(const String& subjectName, int elevation, float sampleRate); |
56 | 59 |
57 // Given two HRTFElevations, and an interpolation factor x: 0 -> 1, returns an
interpolated HRTFElevation. | 60 // Given two HRTFElevations, and an interpolation factor x: 0 -> 1, returns an |
| 61 // interpolated HRTFElevation. |
58 static std::unique_ptr<HRTFElevation> createByInterpolatingSlices( | 62 static std::unique_ptr<HRTFElevation> createByInterpolatingSlices( |
59 HRTFElevation* hrtfElevation1, | 63 HRTFElevation* hrtfElevation1, |
60 HRTFElevation* hrtfElevation2, | 64 HRTFElevation* hrtfElevation2, |
61 float x, | 65 float x, |
62 float sampleRate); | 66 float sampleRate); |
63 | 67 |
64 // Returns the list of left or right ear HRTFKernels for all the azimuths goin
g from 0 to 360 degrees. | 68 // Returns the list of left or right ear HRTFKernels for all the azimuths |
| 69 // going from 0 to 360 degrees. |
65 HRTFKernelList* kernelListL() { return m_kernelListL.get(); } | 70 HRTFKernelList* kernelListL() { return m_kernelListL.get(); } |
66 HRTFKernelList* kernelListR() { return m_kernelListR.get(); } | 71 HRTFKernelList* kernelListR() { return m_kernelListR.get(); } |
67 | 72 |
68 double elevationAngle() const { return m_elevationAngle; } | 73 double elevationAngle() const { return m_elevationAngle; } |
69 unsigned numberOfAzimuths() const { return NumberOfTotalAzimuths; } | 74 unsigned numberOfAzimuths() const { return NumberOfTotalAzimuths; } |
70 float sampleRate() const { return m_sampleRate; } | 75 float sampleRate() const { return m_sampleRate; } |
71 | 76 |
72 // Returns the left and right kernels for the given azimuth index. | 77 // Returns the left and right kernels for the given azimuth index. |
73 // The interpolated delays based on azimuthBlend: 0 -> 1 are returned in frame
DelayL and frameDelayR. | 78 // The interpolated delays based on azimuthBlend: 0 -> 1 are returned in |
| 79 // frameDelayL and frameDelayR. |
74 void getKernelsFromAzimuth(double azimuthBlend, | 80 void getKernelsFromAzimuth(double azimuthBlend, |
75 unsigned azimuthIndex, | 81 unsigned azimuthIndex, |
76 HRTFKernel*& kernelL, | 82 HRTFKernel*& kernelL, |
77 HRTFKernel*& kernelR, | 83 HRTFKernel*& kernelR, |
78 double& frameDelayL, | 84 double& frameDelayL, |
79 double& frameDelayR); | 85 double& frameDelayR); |
80 | 86 |
81 // Spacing, in degrees, between every azimuth loaded from resource. | 87 // Spacing, in degrees, between every azimuth loaded from resource. |
82 static const unsigned AzimuthSpacing; | 88 static const unsigned AzimuthSpacing; |
83 | 89 |
84 // Number of azimuths loaded from resource. | 90 // Number of azimuths loaded from resource. |
85 static const unsigned NumberOfRawAzimuths; | 91 static const unsigned NumberOfRawAzimuths; |
86 | 92 |
87 // Interpolates by this factor to get the total number of azimuths from every
azimuth loaded from resource. | 93 // Interpolates by this factor to get the total number of azimuths from every |
| 94 // azimuth loaded from resource. |
88 static const unsigned InterpolationFactor; | 95 static const unsigned InterpolationFactor; |
89 | 96 |
90 // Total number of azimuths after interpolation. | 97 // Total number of azimuths after interpolation. |
91 static const unsigned NumberOfTotalAzimuths; | 98 static const unsigned NumberOfTotalAzimuths; |
92 | 99 |
93 // Given a specific azimuth and elevation angle, returns the left and right HR
TFKernel. | 100 // Given a specific azimuth and elevation angle, returns the left and right |
| 101 // HRTFKernel. |
94 // Valid values for azimuth are 0 -> 345 in 15 degree increments. | 102 // Valid values for azimuth are 0 -> 345 in 15 degree increments. |
95 // Valid values for elevation are -45 -> +90 in 15 degree increments. | 103 // Valid values for elevation are -45 -> +90 in 15 degree increments. |
96 // Returns true on success. | 104 // Returns true on success. |
97 static bool calculateKernelsForAzimuthElevation( | 105 static bool calculateKernelsForAzimuthElevation( |
98 int azimuth, | 106 int azimuth, |
99 int elevation, | 107 int elevation, |
100 float sampleRate, | 108 float sampleRate, |
101 const String& subjectName, | 109 const String& subjectName, |
102 std::unique_ptr<HRTFKernel>& kernelL, | 110 std::unique_ptr<HRTFKernel>& kernelL, |
103 std::unique_ptr<HRTFKernel>& kernelR); | 111 std::unique_ptr<HRTFKernel>& kernelR); |
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114 | 122 |
115 std::unique_ptr<HRTFKernelList> m_kernelListL; | 123 std::unique_ptr<HRTFKernelList> m_kernelListL; |
116 std::unique_ptr<HRTFKernelList> m_kernelListR; | 124 std::unique_ptr<HRTFKernelList> m_kernelListR; |
117 double m_elevationAngle; | 125 double m_elevationAngle; |
118 float m_sampleRate; | 126 float m_sampleRate; |
119 }; | 127 }; |
120 | 128 |
121 } // namespace blink | 129 } // namespace blink |
122 | 130 |
123 #endif // HRTFElevation_h | 131 #endif // HRTFElevation_h |
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