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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 |
| 11 * documentation and/or other materials provided with the distribution. | 11 * documentation and/or other materials provided with the distribution. |
| 12 * | 12 * |
| 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND AN
Y | 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND AN
Y |
| 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| 15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | 15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| 16 * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR AN
Y | 16 * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR AN
Y |
| 17 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | 17 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| 18 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | 18 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| 19 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND O
N | 19 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND O
N |
| 20 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | 20 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 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 "platform/audio/HRTFPanner.h" | 25 #include "platform/audio/HRTFPanner.h" |
| 26 | 26 |
| 27 #if ENABLE(WEB_AUDIO) | 27 #if ENABLE(WEB_AUDIO) |
| 28 #include <algorithm> | |
| 29 #include "platform/audio/AudioBus.h" | 28 #include "platform/audio/AudioBus.h" |
| 30 #include "platform/audio/AudioUtilities.h" | 29 #include "platform/audio/AudioUtilities.h" |
| 31 #include "platform/audio/HRTFDatabase.h" | 30 #include "platform/audio/HRTFDatabase.h" |
| 32 #include "wtf/MathExtras.h" | 31 #include "wtf/MathExtras.h" |
| 33 #include "wtf/RefPtr.h" | 32 #include "wtf/RefPtr.h" |
| 34 | 33 |
| 35 namespace blink { | 34 namespace blink { |
| 36 | 35 |
| 37 // The value of 2 milliseconds is larger than the largest delay which exists in
any HRTFKernel from the default HRTFDatabase (0.0136 seconds). | 36 // The value of 2 milliseconds is larger than the largest delay which exists in
any HRTFKernel from the default HRTFDatabase (0.0136 seconds). |
| 38 // We ASSERT the delay values used in process() with this value. | 37 // We ASSERT the delay values used in process() with this value. |
| (...skipping 70 matching lines...) Expand 10 before | Expand all | Expand 10 after Loading... |
| 109 int numberOfAzimuths = HRTFDatabase::numberOfAzimuths(); | 108 int numberOfAzimuths = HRTFDatabase::numberOfAzimuths(); |
| 110 const double angleBetweenAzimuths = 360.0 / numberOfAzimuths; | 109 const double angleBetweenAzimuths = 360.0 / numberOfAzimuths; |
| 111 | 110 |
| 112 // Calculate the azimuth index and the blend (0 -> 1) for interpolation. | 111 // Calculate the azimuth index and the blend (0 -> 1) for interpolation. |
| 113 double desiredAzimuthIndexFloat = azimuth / angleBetweenAzimuths; | 112 double desiredAzimuthIndexFloat = azimuth / angleBetweenAzimuths; |
| 114 int desiredAzimuthIndex = static_cast<int>(desiredAzimuthIndexFloat); | 113 int desiredAzimuthIndex = static_cast<int>(desiredAzimuthIndexFloat); |
| 115 azimuthBlend = desiredAzimuthIndexFloat - static_cast<double>(desiredAzimuth
Index); | 114 azimuthBlend = desiredAzimuthIndexFloat - static_cast<double>(desiredAzimuth
Index); |
| 116 | 115 |
| 117 // We don't immediately start using this azimuth index, but instead approach
this index from the last index we rendered at. | 116 // We don't immediately start using this azimuth index, but instead approach
this index from the last index we rendered at. |
| 118 // This minimizes the clicks and graininess for moving sources which occur o
therwise. | 117 // This minimizes the clicks and graininess for moving sources which occur o
therwise. |
| 119 desiredAzimuthIndex = std::max(0, desiredAzimuthIndex); | 118 desiredAzimuthIndex = clampTo(desiredAzimuthIndex, 0, numberOfAzimuths - 1); |
| 120 desiredAzimuthIndex = std::min(numberOfAzimuths - 1, desiredAzimuthIndex); | |
| 121 return desiredAzimuthIndex; | 119 return desiredAzimuthIndex; |
| 122 } | 120 } |
| 123 | 121 |
| 124 void HRTFPanner::pan(double desiredAzimuth, double elevation, const AudioBus* in
putBus, AudioBus* outputBus, size_t framesToProcess) | 122 void HRTFPanner::pan(double desiredAzimuth, double elevation, const AudioBus* in
putBus, AudioBus* outputBus, size_t framesToProcess) |
| 125 { | 123 { |
| 126 unsigned numInputChannels = inputBus ? inputBus->numberOfChannels() : 0; | 124 unsigned numInputChannels = inputBus ? inputBus->numberOfChannels() : 0; |
| 127 | 125 |
| 128 bool isInputGood = inputBus && numInputChannels >= 1 && numInputChannels <=
2; | 126 bool isInputGood = inputBus && numInputChannels >= 1 && numInputChannels <=
2; |
| 129 ASSERT(isInputGood); | 127 ASSERT(isInputGood); |
| 130 | 128 |
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| 307 double HRTFPanner::latencyTime() const | 305 double HRTFPanner::latencyTime() const |
| 308 { | 306 { |
| 309 // 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 |
| 310 // same value. | 308 // same value. |
| 311 return (fftSize() / 2) / static_cast<double>(sampleRate()); | 309 return (fftSize() / 2) / static_cast<double>(sampleRate()); |
| 312 } | 310 } |
| 313 | 311 |
| 314 } // namespace blink | 312 } // namespace blink |
| 315 | 313 |
| 316 #endif // ENABLE(WEB_AUDIO) | 314 #endif // ENABLE(WEB_AUDIO) |
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