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| 1 /* | 1 /* |
| 2 * Copyright (C) 2011 Google Inc. All rights reserved. | 2 * Copyright (C) 2011 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 * | 7 * |
| 8 * 1. Redistributions of source code must retain the above copyright | 8 * 1. Redistributions of source code must retain the above copyright |
| 9 * notice, this list of conditions and the following disclaimer. | 9 * notice, this list of conditions and the following disclaimer. |
| 10 * 2. Redistributions in binary form must reproduce the above copyright | 10 * 2. Redistributions in binary form must reproduce the above copyright |
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| 32 | 32 |
| 33 #include "platform/audio/DynamicsCompressorKernel.h" | 33 #include "platform/audio/DynamicsCompressorKernel.h" |
| 34 | 34 |
| 35 #include <algorithm> | 35 #include <algorithm> |
| 36 #include "platform/audio/AudioUtilities.h" | 36 #include "platform/audio/AudioUtilities.h" |
| 37 #include "platform/audio/DenormalDisabler.h" | 37 #include "platform/audio/DenormalDisabler.h" |
| 38 #include "wtf/MathExtras.h" | 38 #include "wtf/MathExtras.h" |
| 39 | 39 |
| 40 using namespace std; | 40 using namespace std; |
| 41 | 41 |
| 42 namespace WebCore { | 42 namespace blink { |
| 43 | 43 |
| 44 using namespace AudioUtilities; | 44 using namespace AudioUtilities; |
| 45 | 45 |
| 46 // Metering hits peaks instantly, but releases this fast (in seconds). | 46 // Metering hits peaks instantly, but releases this fast (in seconds). |
| 47 const float meteringReleaseTimeConstant = 0.325f; | 47 const float meteringReleaseTimeConstant = 0.325f; |
| 48 | 48 |
| 49 const float uninitializedValue = -1; | 49 const float uninitializedValue = -1; |
| 50 | 50 |
| 51 DynamicsCompressorKernel::DynamicsCompressorKernel(float sampleRate, unsigned nu
mberOfChannels) | 51 DynamicsCompressorKernel::DynamicsCompressorKernel(float sampleRate, unsigned nu
mberOfChannels) |
| 52 : m_sampleRate(sampleRate) | 52 : m_sampleRate(sampleRate) |
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| 467 // Predelay section. | 467 // Predelay section. |
| 468 for (unsigned i = 0; i < m_preDelayBuffers.size(); ++i) | 468 for (unsigned i = 0; i < m_preDelayBuffers.size(); ++i) |
| 469 m_preDelayBuffers[i]->zero(); | 469 m_preDelayBuffers[i]->zero(); |
| 470 | 470 |
| 471 m_preDelayReadIndex = 0; | 471 m_preDelayReadIndex = 0; |
| 472 m_preDelayWriteIndex = DefaultPreDelayFrames; | 472 m_preDelayWriteIndex = DefaultPreDelayFrames; |
| 473 | 473 |
| 474 m_maxAttackCompressionDiffDb = -1; // uninitialized state | 474 m_maxAttackCompressionDiffDb = -1; // uninitialized state |
| 475 } | 475 } |
| 476 | 476 |
| 477 } // namespace WebCore | 477 } // namespace blink |
| 478 | 478 |
| 479 #endif // ENABLE(WEB_AUDIO) | 479 #endif // ENABLE(WEB_AUDIO) |
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