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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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21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | 21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
22 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | 22 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
23 */ | 23 */ |
24 | 24 |
25 #include "config.h" | 25 #include "config.h" |
26 | 26 |
27 #if ENABLE(WEB_AUDIO) | 27 #if ENABLE(WEB_AUDIO) |
28 | 28 |
29 #include "platform/audio/HRTFPanner.h" | 29 #include "platform/audio/HRTFPanner.h" |
30 | 30 |
31 #include <algorithm> | |
32 #include "platform/audio/AudioBus.h" | 31 #include "platform/audio/AudioBus.h" |
33 #include "platform/audio/AudioUtilities.h" | 32 #include "platform/audio/AudioUtilities.h" |
34 #include "platform/audio/HRTFDatabase.h" | 33 #include "platform/audio/HRTFDatabase.h" |
35 #include "wtf/MathExtras.h" | 34 #include "wtf/MathExtras.h" |
36 #include "wtf/RefPtr.h" | 35 #include "wtf/RefPtr.h" |
37 | 36 |
38 namespace blink { | 37 namespace blink { |
39 | 38 |
40 // The value of 2 milliseconds is larger than the largest delay which exists in
any HRTFKernel from the default HRTFDatabase (0.0136 seconds). | 39 // The value of 2 milliseconds is larger than the largest delay which exists in
any HRTFKernel from the default HRTFDatabase (0.0136 seconds). |
41 // We ASSERT the delay values used in process() with this value. | 40 // We ASSERT the delay values used in process() with this value. |
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112 int numberOfAzimuths = HRTFDatabase::numberOfAzimuths(); | 111 int numberOfAzimuths = HRTFDatabase::numberOfAzimuths(); |
113 const double angleBetweenAzimuths = 360.0 / numberOfAzimuths; | 112 const double angleBetweenAzimuths = 360.0 / numberOfAzimuths; |
114 | 113 |
115 // Calculate the azimuth index and the blend (0 -> 1) for interpolation. | 114 // Calculate the azimuth index and the blend (0 -> 1) for interpolation. |
116 double desiredAzimuthIndexFloat = azimuth / angleBetweenAzimuths; | 115 double desiredAzimuthIndexFloat = azimuth / angleBetweenAzimuths; |
117 int desiredAzimuthIndex = static_cast<int>(desiredAzimuthIndexFloat); | 116 int desiredAzimuthIndex = static_cast<int>(desiredAzimuthIndexFloat); |
118 azimuthBlend = desiredAzimuthIndexFloat - static_cast<double>(desiredAzimuth
Index); | 117 azimuthBlend = desiredAzimuthIndexFloat - static_cast<double>(desiredAzimuth
Index); |
119 | 118 |
120 // We don't immediately start using this azimuth index, but instead approach
this index from the last index we rendered at. | 119 // We don't immediately start using this azimuth index, but instead approach
this index from the last index we rendered at. |
121 // This minimizes the clicks and graininess for moving sources which occur o
therwise. | 120 // This minimizes the clicks and graininess for moving sources which occur o
therwise. |
122 desiredAzimuthIndex = std::max(0, desiredAzimuthIndex); | 121 desiredAzimuthIndex = clampTo(desiredAzimuthIndex, 0, numberOfAzimuths - 1); |
123 desiredAzimuthIndex = std::min(numberOfAzimuths - 1, desiredAzimuthIndex); | |
124 return desiredAzimuthIndex; | 122 return desiredAzimuthIndex; |
125 } | 123 } |
126 | 124 |
127 void HRTFPanner::pan(double desiredAzimuth, double elevation, const AudioBus* in
putBus, AudioBus* outputBus, size_t framesToProcess) | 125 void HRTFPanner::pan(double desiredAzimuth, double elevation, const AudioBus* in
putBus, AudioBus* outputBus, size_t framesToProcess) |
128 { | 126 { |
129 unsigned numInputChannels = inputBus ? inputBus->numberOfChannels() : 0; | 127 unsigned numInputChannels = inputBus ? inputBus->numberOfChannels() : 0; |
130 | 128 |
131 bool isInputGood = inputBus && numInputChannels >= 1 && numInputChannels <=
2; | 129 bool isInputGood = inputBus && numInputChannels >= 1 && numInputChannels <=
2; |
132 ASSERT(isInputGood); | 130 ASSERT(isInputGood); |
133 | 131 |
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310 double HRTFPanner::latencyTime() const | 308 double HRTFPanner::latencyTime() const |
311 { | 309 { |
312 // The latency of a FFTConvolver is also fftSize() / 2, and is in addition t
o its tailTime of the | 310 // The latency of a FFTConvolver is also fftSize() / 2, and is in addition t
o its tailTime of the |
313 // same value. | 311 // same value. |
314 return (fftSize() / 2) / static_cast<double>(sampleRate()); | 312 return (fftSize() / 2) / static_cast<double>(sampleRate()); |
315 } | 313 } |
316 | 314 |
317 } // namespace blink | 315 } // namespace blink |
318 | 316 |
319 #endif // ENABLE(WEB_AUDIO) | 317 #endif // ENABLE(WEB_AUDIO) |
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