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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 |
| 11 * notice, this list of conditions and the following disclaimer in the | 11 * notice, this list of conditions and the following disclaimer in the |
| 12 * documentation and/or other materials provided with the distribution. | 12 * documentation and/or other materials provided with the distribution. |
| 13 * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of | 13 * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of |
| 14 * its contributors may be used to endorse or promote products derived | 14 * its contributors may be used to endorse or promote products derived |
| 15 * from this software without specific prior written permission. | 15 * from this software without specific prior written permission. |
| 16 * | 16 * |
| 17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY | 17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY |
| 18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | 18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| 19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | 19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| 20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY | 20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY |
| 21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | 21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| 22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | 22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| 23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND | 23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 */ | 27 */ |
| 28 | 28 |
| 29 #include "platform/audio/DynamicsCompressorKernel.h" | |
| 30 #include "platform/audio/AudioUtilities.h" | 29 #include "platform/audio/AudioUtilities.h" |
| 31 #include "platform/audio/DenormalDisabler.h" | 30 #include "platform/audio/DenormalDisabler.h" |
| 31 #include "platform/audio/DynamicsCompressorKernel.h" |
| 32 #include "wtf/MathExtras.h" | 32 #include "wtf/MathExtras.h" |
| 33 #include "wtf/PtrUtil.h" |
| 33 #include <algorithm> | 34 #include <algorithm> |
| 34 #include <cmath> | 35 #include <cmath> |
| 35 | 36 |
| 36 namespace blink { | 37 namespace blink { |
| 37 | 38 |
| 38 using namespace AudioUtilities; | 39 using namespace AudioUtilities; |
| 39 | 40 |
| 40 // Metering hits peaks instantly, but releases this fast (in seconds). | 41 // Metering hits peaks instantly, but releases this fast (in seconds). |
| 41 const float meteringReleaseTimeConstant = 0.325f; | 42 const float meteringReleaseTimeConstant = 0.325f; |
| 42 | 43 |
| (...skipping 22 matching lines...) Expand all Loading... |
| 65 m_meteringReleaseK = static_cast<float>(discreteTimeConstantForSampleRate(me
teringReleaseTimeConstant, sampleRate)); | 66 m_meteringReleaseK = static_cast<float>(discreteTimeConstantForSampleRate(me
teringReleaseTimeConstant, sampleRate)); |
| 66 } | 67 } |
| 67 | 68 |
| 68 void DynamicsCompressorKernel::setNumberOfChannels(unsigned numberOfChannels) | 69 void DynamicsCompressorKernel::setNumberOfChannels(unsigned numberOfChannels) |
| 69 { | 70 { |
| 70 if (m_preDelayBuffers.size() == numberOfChannels) | 71 if (m_preDelayBuffers.size() == numberOfChannels) |
| 71 return; | 72 return; |
| 72 | 73 |
| 73 m_preDelayBuffers.clear(); | 74 m_preDelayBuffers.clear(); |
| 74 for (unsigned i = 0; i < numberOfChannels; ++i) | 75 for (unsigned i = 0; i < numberOfChannels; ++i) |
| 75 m_preDelayBuffers.append(adoptPtr(new AudioFloatArray(MaxPreDelayFrames)
)); | 76 m_preDelayBuffers.append(wrapUnique(new AudioFloatArray(MaxPreDelayFrame
s))); |
| 76 } | 77 } |
| 77 | 78 |
| 78 void DynamicsCompressorKernel::setPreDelayTime(float preDelayTime) | 79 void DynamicsCompressorKernel::setPreDelayTime(float preDelayTime) |
| 79 { | 80 { |
| 80 // Re-configure look-ahead section pre-delay if delay time has changed. | 81 // Re-configure look-ahead section pre-delay if delay time has changed. |
| 81 unsigned preDelayFrames = preDelayTime * sampleRate(); | 82 unsigned preDelayFrames = preDelayTime * sampleRate(); |
| 82 if (preDelayFrames > MaxPreDelayFrames - 1) | 83 if (preDelayFrames > MaxPreDelayFrames - 1) |
| 83 preDelayFrames = MaxPreDelayFrames - 1; | 84 preDelayFrames = MaxPreDelayFrames - 1; |
| 84 | 85 |
| 85 if (m_lastPreDelayFrames != preDelayFrames) { | 86 if (m_lastPreDelayFrames != preDelayFrames) { |
| (...skipping 376 matching lines...) Expand 10 before | Expand all | Expand 10 after Loading... |
| 462 m_preDelayBuffers[i]->zero(); | 463 m_preDelayBuffers[i]->zero(); |
| 463 | 464 |
| 464 m_preDelayReadIndex = 0; | 465 m_preDelayReadIndex = 0; |
| 465 m_preDelayWriteIndex = DefaultPreDelayFrames; | 466 m_preDelayWriteIndex = DefaultPreDelayFrames; |
| 466 | 467 |
| 467 m_maxAttackCompressionDiffDb = -1; // uninitialized state | 468 m_maxAttackCompressionDiffDb = -1; // uninitialized state |
| 468 } | 469 } |
| 469 | 470 |
| 470 } // namespace blink | 471 } // namespace blink |
| 471 | 472 |
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