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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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40 | 40 |
41 namespace WebCore { | 41 namespace WebCore { |
42 | 42 |
43 // The value of 2 milliseconds is larger than the largest delay which exists in
any HRTFKernel from the default HRTFDatabase (0.0136 seconds). | 43 // 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. | 44 // We ASSERT the delay values used in process() with this value. |
45 const double MaxDelayTimeSeconds = 0.002; | 45 const double MaxDelayTimeSeconds = 0.002; |
46 | 46 |
47 const int UninitializedAzimuth = -1; | 47 const int UninitializedAzimuth = -1; |
48 const unsigned RenderingQuantum = 128; | 48 const unsigned RenderingQuantum = 128; |
49 | 49 |
50 HRTFPanner::HRTFPanner(float sampleRate) | 50 HRTFPanner::HRTFPanner(float sampleRate, HRTFDatabase* database) |
51 : Panner(PanningModelHRTF) | 51 : Panner(PanningModelHRTF) |
| 52 , m_database(database) |
52 , m_sampleRate(sampleRate) | 53 , m_sampleRate(sampleRate) |
53 , m_crossfadeSelection(CrossfadeSelection1) | 54 , m_crossfadeSelection(CrossfadeSelection1) |
54 , m_azimuthIndex1(UninitializedAzimuth) | 55 , m_azimuthIndex1(UninitializedAzimuth) |
55 , m_elevation1(0) | 56 , m_elevation1(0) |
56 , m_azimuthIndex2(UninitializedAzimuth) | 57 , m_azimuthIndex2(UninitializedAzimuth) |
57 , m_elevation2(0) | 58 , m_elevation2(0) |
58 , m_crossfadeX(0) | 59 , m_crossfadeX(0) |
59 , m_crossfadeIncr(0) | 60 , m_crossfadeIncr(0) |
60 , m_convolverL1(fftSizeForSampleRate(sampleRate)) | 61 , m_convolverL1(fftSizeForSampleRate(sampleRate)) |
61 , m_convolverR1(fftSizeForSampleRate(sampleRate)) | 62 , m_convolverR1(fftSizeForSampleRate(sampleRate)) |
62 , m_convolverL2(fftSizeForSampleRate(sampleRate)) | 63 , m_convolverL2(fftSizeForSampleRate(sampleRate)) |
63 , m_convolverR2(fftSizeForSampleRate(sampleRate)) | 64 , m_convolverR2(fftSizeForSampleRate(sampleRate)) |
64 , m_delayLineL(MaxDelayTimeSeconds, sampleRate) | 65 , m_delayLineL(MaxDelayTimeSeconds, sampleRate) |
65 , m_delayLineR(MaxDelayTimeSeconds, sampleRate) | 66 , m_delayLineR(MaxDelayTimeSeconds, sampleRate) |
66 , m_tempL1(RenderingQuantum) | 67 , m_tempL1(RenderingQuantum) |
67 , m_tempR1(RenderingQuantum) | 68 , m_tempR1(RenderingQuantum) |
68 , m_tempL2(RenderingQuantum) | 69 , m_tempL2(RenderingQuantum) |
69 , m_tempR2(RenderingQuantum) | 70 , m_tempR2(RenderingQuantum) |
70 { | 71 { |
| 72 ASSERT(database); |
71 } | 73 } |
72 | 74 |
73 HRTFPanner::~HRTFPanner() | 75 HRTFPanner::~HRTFPanner() |
74 { | 76 { |
75 } | 77 } |
76 | 78 |
77 size_t HRTFPanner::fftSizeForSampleRate(float sampleRate) | 79 size_t HRTFPanner::fftSizeForSampleRate(float sampleRate) |
78 { | 80 { |
79 // The HRTF impulse responses (loaded as audio resources) are 512 sample-fra
mes @44.1KHz. | 81 // 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). | 82 // 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(); | 95 m_delayLineR.reset(); |
94 } | 96 } |
95 | 97 |
96 int HRTFPanner::calculateDesiredAzimuthIndexAndBlend(double azimuth, double& azi
muthBlend) | 98 int HRTFPanner::calculateDesiredAzimuthIndexAndBlend(double azimuth, double& azi
muthBlend) |
97 { | 99 { |
98 // Convert the azimuth angle from the range -180 -> +180 into the range 0 ->
360. | 100 // 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. | 101 // The azimuth index may then be calculated from this positive value. |
100 if (azimuth < 0) | 102 if (azimuth < 0) |
101 azimuth += 360.0; | 103 azimuth += 360.0; |
102 | 104 |
103 HRTFDatabase* database = HRTFDatabaseLoader::defaultHRTFDatabase(); | 105 int numberOfAzimuths = m_database->numberOfAzimuths(); |
104 ASSERT(database); | |
105 | |
106 int numberOfAzimuths = database->numberOfAzimuths(); | |
107 const double angleBetweenAzimuths = 360.0 / numberOfAzimuths; | 106 const double angleBetweenAzimuths = 360.0 / numberOfAzimuths; |
108 | 107 |
109 // Calculate the azimuth index and the blend (0 -> 1) for interpolation. | 108 // Calculate the azimuth index and the blend (0 -> 1) for interpolation. |
110 double desiredAzimuthIndexFloat = azimuth / angleBetweenAzimuths; | 109 double desiredAzimuthIndexFloat = azimuth / angleBetweenAzimuths; |
111 int desiredAzimuthIndex = static_cast<int>(desiredAzimuthIndexFloat); | 110 int desiredAzimuthIndex = static_cast<int>(desiredAzimuthIndexFloat); |
112 azimuthBlend = desiredAzimuthIndexFloat - static_cast<double>(desiredAzimuth
Index); | 111 azimuthBlend = desiredAzimuthIndexFloat - static_cast<double>(desiredAzimuth
Index); |
113 | 112 |
114 // We don't immediately start using this azimuth index, but instead approach
this index from the last index we rendered at. | 113 // We don't immediately start using this azimuth index, but instead approach
this index from the last index we rendered at. |
115 // This minimizes the clicks and graininess for moving sources which occur o
therwise. | 114 // This minimizes the clicks and graininess for moving sources which occur o
therwise. |
116 desiredAzimuthIndex = max(0, desiredAzimuthIndex); | 115 desiredAzimuthIndex = max(0, desiredAzimuthIndex); |
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127 | 126 |
128 bool isOutputGood = outputBus && outputBus->numberOfChannels() == 2 && frame
sToProcess <= outputBus->length(); | 127 bool isOutputGood = outputBus && outputBus->numberOfChannels() == 2 && frame
sToProcess <= outputBus->length(); |
129 ASSERT(isOutputGood); | 128 ASSERT(isOutputGood); |
130 | 129 |
131 if (!isInputGood || !isOutputGood) { | 130 if (!isInputGood || !isOutputGood) { |
132 if (outputBus) | 131 if (outputBus) |
133 outputBus->zero(); | 132 outputBus->zero(); |
134 return; | 133 return; |
135 } | 134 } |
136 | 135 |
137 // This code only runs as long as the context is alive and after database ha
s been loaded. | |
138 HRTFDatabase* database = HRTFDatabaseLoader::defaultHRTFDatabase(); | |
139 ASSERT(database); | |
140 if (!database) { | |
141 outputBus->zero(); | |
142 return; | |
143 } | |
144 | |
145 // IRCAM HRTF azimuths values from the loaded database is reversed from the
panner's notion of azimuth. | 136 // IRCAM HRTF azimuths values from the loaded database is reversed from the
panner's notion of azimuth. |
146 double azimuth = -desiredAzimuth; | 137 double azimuth = -desiredAzimuth; |
147 | 138 |
148 bool isAzimuthGood = azimuth >= -180.0 && azimuth <= 180.0; | 139 bool isAzimuthGood = azimuth >= -180.0 && azimuth <= 180.0; |
149 ASSERT(isAzimuthGood); | 140 ASSERT(isAzimuthGood); |
150 if (!isAzimuthGood) { | 141 if (!isAzimuthGood) { |
151 outputBus->zero(); | 142 outputBus->zero(); |
152 return; | 143 return; |
153 } | 144 } |
154 | 145 |
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209 for (unsigned segment = 0; segment < numberOfSegments; ++segment) { | 200 for (unsigned segment = 0; segment < numberOfSegments; ++segment) { |
210 // Get the HRTFKernels and interpolated delays. | 201 // Get the HRTFKernels and interpolated delays. |
211 HRTFKernel* kernelL1; | 202 HRTFKernel* kernelL1; |
212 HRTFKernel* kernelR1; | 203 HRTFKernel* kernelR1; |
213 HRTFKernel* kernelL2; | 204 HRTFKernel* kernelL2; |
214 HRTFKernel* kernelR2; | 205 HRTFKernel* kernelR2; |
215 double frameDelayL1; | 206 double frameDelayL1; |
216 double frameDelayR1; | 207 double frameDelayR1; |
217 double frameDelayL2; | 208 double frameDelayL2; |
218 double frameDelayR2; | 209 double frameDelayR2; |
219 database->getKernelsFromAzimuthElevation(azimuthBlend, m_azimuthIndex1,
m_elevation1, kernelL1, kernelR1, frameDelayL1, frameDelayR1); | 210 m_database->getKernelsFromAzimuthElevation(azimuthBlend, m_azimuthIndex1
, m_elevation1, kernelL1, kernelR1, frameDelayL1, frameDelayR1); |
220 database->getKernelsFromAzimuthElevation(azimuthBlend, m_azimuthIndex2,
m_elevation2, kernelL2, kernelR2, frameDelayL2, frameDelayR2); | 211 m_database->getKernelsFromAzimuthElevation(azimuthBlend, m_azimuthIndex2
, m_elevation2, kernelL2, kernelR2, frameDelayL2, frameDelayR2); |
221 | 212 |
222 bool areKernelsGood = kernelL1 && kernelR1 && kernelL2 && kernelR2; | 213 bool areKernelsGood = kernelL1 && kernelR1 && kernelL2 && kernelR2; |
223 ASSERT(areKernelsGood); | 214 ASSERT(areKernelsGood); |
224 if (!areKernelsGood) { | 215 if (!areKernelsGood) { |
225 outputBus->zero(); | 216 outputBus->zero(); |
226 return; | 217 return; |
227 } | 218 } |
228 | 219 |
229 ASSERT(frameDelayL1 / sampleRate() < MaxDelayTimeSeconds && frameDelayR1
/ sampleRate() < MaxDelayTimeSeconds); | 220 ASSERT(frameDelayL1 / sampleRate() < MaxDelayTimeSeconds && frameDelayR1
/ sampleRate() < MaxDelayTimeSeconds); |
230 ASSERT(frameDelayL2 / sampleRate() < MaxDelayTimeSeconds && frameDelayR2
/ sampleRate() < MaxDelayTimeSeconds); | 221 ASSERT(frameDelayL2 / sampleRate() < MaxDelayTimeSeconds && frameDelayR2
/ sampleRate() < MaxDelayTimeSeconds); |
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305 double HRTFPanner::latencyTime() const | 296 double HRTFPanner::latencyTime() const |
306 { | 297 { |
307 // The latency of a FFTConvolver is also fftSize() / 2, and is in addition t
o its tailTime of the | 298 // The latency of a FFTConvolver is also fftSize() / 2, and is in addition t
o its tailTime of the |
308 // same value. | 299 // same value. |
309 return (fftSize() / 2) / static_cast<double>(sampleRate()); | 300 return (fftSize() / 2) / static_cast<double>(sampleRate()); |
310 } | 301 } |
311 | 302 |
312 } // namespace WebCore | 303 } // namespace WebCore |
313 | 304 |
314 #endif // ENABLE(WEB_AUDIO) | 305 #endif // ENABLE(WEB_AUDIO) |
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