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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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25 #include "config.h" | 25 #include "config.h" |
26 | 26 |
27 #if ENABLE(WEB_AUDIO) | 27 #if ENABLE(WEB_AUDIO) |
28 | 28 |
29 #include "core/platform/audio/HRTFPanner.h" | 29 #include "core/platform/audio/HRTFPanner.h" |
30 | 30 |
31 #include <algorithm> | 31 #include <algorithm> |
32 #include "core/platform/audio/AudioBus.h" | 32 #include "core/platform/audio/AudioBus.h" |
33 #include "core/platform/audio/FFTConvolver.h" | 33 #include "core/platform/audio/FFTConvolver.h" |
34 #include "core/platform/audio/HRTFDatabase.h" | 34 #include "core/platform/audio/HRTFDatabase.h" |
35 #include "core/platform/audio/HRTFDatabaseLoader.h" | |
36 #include <wtf/MathExtras.h> | 35 #include <wtf/MathExtras.h> |
37 #include <wtf/RefPtr.h> | 36 #include <wtf/RefPtr.h> |
38 | 37 |
39 using namespace std; | 38 using namespace std; |
40 | 39 |
41 namespace WebCore { | 40 namespace WebCore { |
42 | 41 |
43 // The value of 2 milliseconds is larger than the largest delay which exists in
any HRTFKernel from the default HRTFDatabase (0.0136 seconds). | 42 // The value of 2 milliseconds is larger than the largest delay which exists in
any HRTFKernel from the default HRTFDatabase (0.0136 seconds). |
44 // We ASSERT the delay values used in process() with this value. | 43 // We ASSERT the delay values used in process() with this value. |
45 const double MaxDelayTimeSeconds = 0.002; | 44 const double MaxDelayTimeSeconds = 0.002; |
46 | 45 |
47 const int UninitializedAzimuth = -1; | 46 const int UninitializedAzimuth = -1; |
48 const unsigned RenderingQuantum = 128; | 47 const unsigned RenderingQuantum = 128; |
49 | 48 |
50 HRTFPanner::HRTFPanner(float sampleRate) | 49 HRTFPanner::HRTFPanner(float sampleRate, HRTFDatabaseLoader* databaseLoader) |
51 : Panner(PanningModelHRTF) | 50 : Panner(PanningModelHRTF) |
| 51 , m_databaseLoader(databaseLoader) |
52 , m_sampleRate(sampleRate) | 52 , m_sampleRate(sampleRate) |
53 , m_crossfadeSelection(CrossfadeSelection1) | 53 , m_crossfadeSelection(CrossfadeSelection1) |
54 , m_azimuthIndex1(UninitializedAzimuth) | 54 , m_azimuthIndex1(UninitializedAzimuth) |
55 , m_elevation1(0) | 55 , m_elevation1(0) |
56 , m_azimuthIndex2(UninitializedAzimuth) | 56 , m_azimuthIndex2(UninitializedAzimuth) |
57 , m_elevation2(0) | 57 , m_elevation2(0) |
58 , m_crossfadeX(0) | 58 , m_crossfadeX(0) |
59 , m_crossfadeIncr(0) | 59 , m_crossfadeIncr(0) |
60 , m_convolverL1(fftSizeForSampleRate(sampleRate)) | 60 , m_convolverL1(fftSizeForSampleRate(sampleRate)) |
61 , m_convolverR1(fftSizeForSampleRate(sampleRate)) | 61 , m_convolverR1(fftSizeForSampleRate(sampleRate)) |
62 , m_convolverL2(fftSizeForSampleRate(sampleRate)) | 62 , m_convolverL2(fftSizeForSampleRate(sampleRate)) |
63 , m_convolverR2(fftSizeForSampleRate(sampleRate)) | 63 , m_convolverR2(fftSizeForSampleRate(sampleRate)) |
64 , m_delayLineL(MaxDelayTimeSeconds, sampleRate) | 64 , m_delayLineL(MaxDelayTimeSeconds, sampleRate) |
65 , m_delayLineR(MaxDelayTimeSeconds, sampleRate) | 65 , m_delayLineR(MaxDelayTimeSeconds, sampleRate) |
66 , m_tempL1(RenderingQuantum) | 66 , m_tempL1(RenderingQuantum) |
67 , m_tempR1(RenderingQuantum) | 67 , m_tempR1(RenderingQuantum) |
68 , m_tempL2(RenderingQuantum) | 68 , m_tempL2(RenderingQuantum) |
69 , m_tempR2(RenderingQuantum) | 69 , m_tempR2(RenderingQuantum) |
70 { | 70 { |
| 71 ASSERT(databaseLoader); |
71 } | 72 } |
72 | 73 |
73 HRTFPanner::~HRTFPanner() | 74 HRTFPanner::~HRTFPanner() |
74 { | 75 { |
75 } | 76 } |
76 | 77 |
77 size_t HRTFPanner::fftSizeForSampleRate(float sampleRate) | 78 size_t HRTFPanner::fftSizeForSampleRate(float sampleRate) |
78 { | 79 { |
79 // The HRTF impulse responses (loaded as audio resources) are 512 sample-fra
mes @44.1KHz. | 80 // The HRTF impulse responses (loaded as audio resources) are 512 sample-fra
mes @44.1KHz. |
80 // Currently, we truncate the impulse responses to half this size, but an FF
T-size of twice impulse response size is needed (for convolution). | 81 // Currently, we truncate the impulse responses to half this size, but an FF
T-size of twice impulse response size is needed (for convolution). |
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93 m_delayLineR.reset(); | 94 m_delayLineR.reset(); |
94 } | 95 } |
95 | 96 |
96 int HRTFPanner::calculateDesiredAzimuthIndexAndBlend(double azimuth, double& azi
muthBlend) | 97 int HRTFPanner::calculateDesiredAzimuthIndexAndBlend(double azimuth, double& azi
muthBlend) |
97 { | 98 { |
98 // Convert the azimuth angle from the range -180 -> +180 into the range 0 ->
360. | 99 // Convert the azimuth angle from the range -180 -> +180 into the range 0 ->
360. |
99 // The azimuth index may then be calculated from this positive value. | 100 // The azimuth index may then be calculated from this positive value. |
100 if (azimuth < 0) | 101 if (azimuth < 0) |
101 azimuth += 360.0; | 102 azimuth += 360.0; |
102 | 103 |
103 HRTFDatabase* database = HRTFDatabaseLoader::defaultHRTFDatabase(); | 104 HRTFDatabase* database = m_databaseLoader->database(); |
104 ASSERT(database); | 105 ASSERT(database); |
105 | 106 |
106 int numberOfAzimuths = database->numberOfAzimuths(); | 107 int numberOfAzimuths = database->numberOfAzimuths(); |
107 const double angleBetweenAzimuths = 360.0 / numberOfAzimuths; | 108 const double angleBetweenAzimuths = 360.0 / numberOfAzimuths; |
108 | 109 |
109 // Calculate the azimuth index and the blend (0 -> 1) for interpolation. | 110 // Calculate the azimuth index and the blend (0 -> 1) for interpolation. |
110 double desiredAzimuthIndexFloat = azimuth / angleBetweenAzimuths; | 111 double desiredAzimuthIndexFloat = azimuth / angleBetweenAzimuths; |
111 int desiredAzimuthIndex = static_cast<int>(desiredAzimuthIndexFloat); | 112 int desiredAzimuthIndex = static_cast<int>(desiredAzimuthIndexFloat); |
112 azimuthBlend = desiredAzimuthIndexFloat - static_cast<double>(desiredAzimuth
Index); | 113 azimuthBlend = desiredAzimuthIndexFloat - static_cast<double>(desiredAzimuth
Index); |
113 | 114 |
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127 | 128 |
128 bool isOutputGood = outputBus && outputBus->numberOfChannels() == 2 && frame
sToProcess <= outputBus->length(); | 129 bool isOutputGood = outputBus && outputBus->numberOfChannels() == 2 && frame
sToProcess <= outputBus->length(); |
129 ASSERT(isOutputGood); | 130 ASSERT(isOutputGood); |
130 | 131 |
131 if (!isInputGood || !isOutputGood) { | 132 if (!isInputGood || !isOutputGood) { |
132 if (outputBus) | 133 if (outputBus) |
133 outputBus->zero(); | 134 outputBus->zero(); |
134 return; | 135 return; |
135 } | 136 } |
136 | 137 |
137 // This code only runs as long as the context is alive and after database ha
s been loaded. | 138 HRTFDatabase* database = m_databaseLoader->database(); |
138 HRTFDatabase* database = HRTFDatabaseLoader::defaultHRTFDatabase(); | |
139 ASSERT(database); | 139 ASSERT(database); |
140 if (!database) { | 140 if (!database) { |
141 outputBus->zero(); | 141 outputBus->zero(); |
142 return; | 142 return; |
143 } | 143 } |
144 | 144 |
145 // IRCAM HRTF azimuths values from the loaded database is reversed from the
panner's notion of azimuth. | 145 // IRCAM HRTF azimuths values from the loaded database is reversed from the
panner's notion of azimuth. |
146 double azimuth = -desiredAzimuth; | 146 double azimuth = -desiredAzimuth; |
147 | 147 |
148 bool isAzimuthGood = azimuth >= -180.0 && azimuth <= 180.0; | 148 bool isAzimuthGood = azimuth >= -180.0 && azimuth <= 180.0; |
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305 double HRTFPanner::latencyTime() const | 305 double HRTFPanner::latencyTime() const |
306 { | 306 { |
307 // The latency of a FFTConvolver is also fftSize() / 2, and is in addition t
o its tailTime of the | 307 // The latency of a FFTConvolver is also fftSize() / 2, and is in addition t
o its tailTime of the |
308 // same value. | 308 // same value. |
309 return (fftSize() / 2) / static_cast<double>(sampleRate()); | 309 return (fftSize() / 2) / static_cast<double>(sampleRate()); |
310 } | 310 } |
311 | 311 |
312 } // namespace WebCore | 312 } // namespace WebCore |
313 | 313 |
314 #endif // ENABLE(WEB_AUDIO) | 314 #endif // ENABLE(WEB_AUDIO) |
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