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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 * 1. Redistributions of source code must retain the above copyright | 7 * 1. Redistributions of source code must retain the above copyright |
8 * notice, this list of conditions and the following disclaimer. | 8 * notice, this list of conditions and the following disclaimer. |
9 * 2. Redistributions in binary form must reproduce the above copyright | 9 * 2. Redistributions in binary form must reproduce the above copyright |
10 * notice, this list of conditions and the following disclaimer in the | 10 * notice, this list of conditions and the following disclaimer in the |
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24 | 24 |
25 #ifndef HRTFPanner_h | 25 #ifndef HRTFPanner_h |
26 #define HRTFPanner_h | 26 #define HRTFPanner_h |
27 | 27 |
28 #include "core/platform/audio/FFTConvolver.h" | 28 #include "core/platform/audio/FFTConvolver.h" |
29 #include "core/platform/audio/Panner.h" | 29 #include "core/platform/audio/Panner.h" |
30 #include "modules/webaudio/DelayDSPKernel.h" | 30 #include "modules/webaudio/DelayDSPKernel.h" |
31 | 31 |
32 namespace WebCore { | 32 namespace WebCore { |
33 | 33 |
| 34 class HRTFDatabase; |
| 35 |
34 class HRTFPanner : public Panner { | 36 class HRTFPanner : public Panner { |
35 public: | 37 public: |
36 explicit HRTFPanner(float sampleRate); | 38 HRTFPanner(float sampleRate, HRTFDatabase*); |
37 virtual ~HRTFPanner(); | 39 virtual ~HRTFPanner(); |
38 | 40 |
39 // Panner | 41 // Panner |
40 virtual void pan(double azimuth, double elevation, const AudioBus* inputBus,
AudioBus* outputBus, size_t framesToProcess); | 42 virtual void pan(double azimuth, double elevation, const AudioBus* inputBus,
AudioBus* outputBus, size_t framesToProcess); |
41 virtual void reset(); | 43 virtual void reset(); |
42 | 44 |
43 size_t fftSize() const { return fftSizeForSampleRate(m_sampleRate); } | 45 size_t fftSize() const { return fftSizeForSampleRate(m_sampleRate); } |
44 static size_t fftSizeForSampleRate(float sampleRate); | 46 static size_t fftSizeForSampleRate(float sampleRate); |
45 | 47 |
46 float sampleRate() const { return m_sampleRate; } | 48 float sampleRate() const { return m_sampleRate; } |
47 | 49 |
48 virtual double tailTime() const OVERRIDE; | 50 virtual double tailTime() const OVERRIDE; |
49 virtual double latencyTime() const OVERRIDE; | 51 virtual double latencyTime() const OVERRIDE; |
50 | 52 |
51 private: | 53 private: |
52 // Given an azimuth angle in the range -180 -> +180, returns the correspondi
ng azimuth index for the database, | 54 // Given an azimuth angle in the range -180 -> +180, returns the correspondi
ng azimuth index for the database, |
53 // and azimuthBlend which is an interpolation value from 0 -> 1. | 55 // and azimuthBlend which is an interpolation value from 0 -> 1. |
54 int calculateDesiredAzimuthIndexAndBlend(double azimuth, double& azimuthBlen
d); | 56 int calculateDesiredAzimuthIndexAndBlend(double azimuth, double& azimuthBlen
d); |
55 | 57 |
| 58 HRTFDatabase* m_database; |
| 59 |
56 float m_sampleRate; | 60 float m_sampleRate; |
57 | 61 |
58 // We maintain two sets of convolvers for smooth cross-faded interpolations
when | 62 // We maintain two sets of convolvers for smooth cross-faded interpolations
when |
59 // then azimuth and elevation are dynamically changing. | 63 // then azimuth and elevation are dynamically changing. |
60 // When the azimuth and elevation are not changing, we simply process with o
ne of the two sets. | 64 // When the azimuth and elevation are not changing, we simply process with o
ne of the two sets. |
61 // Initially we use CrossfadeSelection1 corresponding to m_convolverL1 and m
_convolverR1. | 65 // Initially we use CrossfadeSelection1 corresponding to m_convolverL1 and m
_convolverR1. |
62 // Whenever the azimuth or elevation changes, a crossfade is initiated to tr
ansition | 66 // Whenever the azimuth or elevation changes, a crossfade is initiated to tr
ansition |
63 // to the new position. So if we're currently processing with CrossfadeSelec
tion1, then | 67 // to the new position. So if we're currently processing with CrossfadeSelec
tion1, then |
64 // we transition to CrossfadeSelection2 (and vice versa). | 68 // we transition to CrossfadeSelection2 (and vice versa). |
65 // If we're in the middle of a transition, then we wait until it is complete
before | 69 // If we're in the middle of a transition, then we wait until it is complete
before |
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97 | 101 |
98 AudioFloatArray m_tempL1; | 102 AudioFloatArray m_tempL1; |
99 AudioFloatArray m_tempR1; | 103 AudioFloatArray m_tempR1; |
100 AudioFloatArray m_tempL2; | 104 AudioFloatArray m_tempL2; |
101 AudioFloatArray m_tempR2; | 105 AudioFloatArray m_tempR2; |
102 }; | 106 }; |
103 | 107 |
104 } // namespace WebCore | 108 } // namespace WebCore |
105 | 109 |
106 #endif // HRTFPanner_h | 110 #endif // HRTFPanner_h |
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