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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 |
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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) { |
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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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