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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/EqualPowerPanner.h" | 29 #include "platform/audio/EqualPowerPanner.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 "wtf/MathExtras.h" | 33 #include "wtf/MathExtras.h" |
| 34 #include <algorithm> |
| 35 #include <cmath> |
| 35 | 36 |
| 36 // Use a 50ms smoothing / de-zippering time-constant. | 37 // Use a 50ms smoothing / de-zippering time-constant. |
| 37 const float SmoothingTimeConstant = 0.050f; | 38 const float SmoothingTimeConstant = 0.050f; |
| 38 | 39 |
| 39 namespace blink { | 40 namespace blink { |
| 40 | 41 |
| 41 EqualPowerPanner::EqualPowerPanner(float sampleRate) | 42 EqualPowerPanner::EqualPowerPanner(float sampleRate) |
| 42 : Panner(PanningModelEqualPower) | 43 : Panner(PanningModelEqualPower) |
| 43 , m_isFirstRender(true) | 44 , m_isFirstRender(true) |
| 44 , m_gainL(0.0) | 45 , m_gainL(0.0) |
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| 63 | 64 |
| 64 const float* sourceL = inputBus->channel(0)->data(); | 65 const float* sourceL = inputBus->channel(0)->data(); |
| 65 const float* sourceR = numberOfInputChannels > 1 ? inputBus->channel(1)->dat
a() : sourceL; | 66 const float* sourceR = numberOfInputChannels > 1 ? inputBus->channel(1)->dat
a() : sourceL; |
| 66 float* destinationL = outputBus->channelByType(AudioBus::ChannelLeft)->mutab
leData(); | 67 float* destinationL = outputBus->channelByType(AudioBus::ChannelLeft)->mutab
leData(); |
| 67 float* destinationR = outputBus->channelByType(AudioBus::ChannelRight)->muta
bleData(); | 68 float* destinationR = outputBus->channelByType(AudioBus::ChannelRight)->muta
bleData(); |
| 68 | 69 |
| 69 if (!sourceL || !sourceR || !destinationL || !destinationR) | 70 if (!sourceL || !sourceR || !destinationL || !destinationR) |
| 70 return; | 71 return; |
| 71 | 72 |
| 72 // Clamp azimuth to allowed range of -180 -> +180. | 73 // Clamp azimuth to allowed range of -180 -> +180. |
| 73 azimuth = std::max(-180.0, azimuth); | 74 azimuth = clampTo(azimuth, -180.0, 180.0); |
| 74 azimuth = std::min(180.0, azimuth); | |
| 75 | 75 |
| 76 // Alias the azimuth ranges behind us to in front of us: | 76 // Alias the azimuth ranges behind us to in front of us: |
| 77 // -90 -> -180 to -90 -> 0 and 90 -> 180 to 90 -> 0 | 77 // -90 -> -180 to -90 -> 0 and 90 -> 180 to 90 -> 0 |
| 78 if (azimuth < -90) | 78 if (azimuth < -90) |
| 79 azimuth = -180 - azimuth; | 79 azimuth = -180 - azimuth; |
| 80 else if (azimuth > 90) | 80 else if (azimuth > 90) |
| 81 azimuth = 180 - azimuth; | 81 azimuth = 180 - azimuth; |
| 82 | 82 |
| 83 double desiredPanPosition; | 83 double desiredPanPosition; |
| 84 double desiredGainL; | 84 double desiredGainL; |
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| 148 } | 148 } |
| 149 } | 149 } |
| 150 | 150 |
| 151 m_gainL = gainL; | 151 m_gainL = gainL; |
| 152 m_gainR = gainR; | 152 m_gainR = gainR; |
| 153 } | 153 } |
| 154 | 154 |
| 155 } // namespace blink | 155 } // namespace blink |
| 156 | 156 |
| 157 #endif // ENABLE(WEB_AUDIO) | 157 #endif // ENABLE(WEB_AUDIO) |
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