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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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44 // Uninitialized state - for parameter recalculation. | 44 // Uninitialized state - for parameter recalculation. |
45 m_lastFilterStageRatio = -1; | 45 m_lastFilterStageRatio = -1; |
46 m_lastAnchor = -1; | 46 m_lastAnchor = -1; |
47 m_lastFilterStageGain = -1; | 47 m_lastFilterStageGain = -1; |
48 | 48 |
49 setNumberOfChannels(numberOfChannels); | 49 setNumberOfChannels(numberOfChannels); |
50 initializeParameters(); | 50 initializeParameters(); |
51 } | 51 } |
52 | 52 |
53 void DynamicsCompressor::setParameterValue(unsigned parameterID, float value) { | 53 void DynamicsCompressor::setParameterValue(unsigned parameterID, float value) { |
54 DCHECK_LT(parameterID, static_cast<unsigned>(ParamLast)); | 54 ASSERT(parameterID < ParamLast); |
55 if (parameterID < ParamLast) | 55 if (parameterID < ParamLast) |
56 m_parameters[parameterID] = value; | 56 m_parameters[parameterID] = value; |
57 } | 57 } |
58 | 58 |
59 void DynamicsCompressor::initializeParameters() { | 59 void DynamicsCompressor::initializeParameters() { |
60 // Initializes compressor to default values. | 60 // Initializes compressor to default values. |
61 | 61 |
62 m_parameters[ParamThreshold] = -24; // dB | 62 m_parameters[ParamThreshold] = -24; // dB |
63 m_parameters[ParamKnee] = 30; // dB | 63 m_parameters[ParamKnee] = 30; // dB |
64 m_parameters[ParamRatio] = 12; // unit-less | 64 m_parameters[ParamRatio] = 12; // unit-less |
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77 m_parameters[ParamFilterAnchor] = 15000 / nyquist(); | 77 m_parameters[ParamFilterAnchor] = 15000 / nyquist(); |
78 | 78 |
79 m_parameters[ParamPostGain] = 0; // dB | 79 m_parameters[ParamPostGain] = 0; // dB |
80 m_parameters[ParamReduction] = 0; // dB | 80 m_parameters[ParamReduction] = 0; // dB |
81 | 81 |
82 // Linear crossfade (0 -> 1). | 82 // Linear crossfade (0 -> 1). |
83 m_parameters[ParamEffectBlend] = 1; | 83 m_parameters[ParamEffectBlend] = 1; |
84 } | 84 } |
85 | 85 |
86 float DynamicsCompressor::parameterValue(unsigned parameterID) { | 86 float DynamicsCompressor::parameterValue(unsigned parameterID) { |
87 DCHECK_LT(parameterID, static_cast<unsigned>(ParamLast)); | 87 ASSERT(parameterID < ParamLast); |
88 return m_parameters[parameterID]; | 88 return m_parameters[parameterID]; |
89 } | 89 } |
90 | 90 |
91 void DynamicsCompressor::process(const AudioBus* sourceBus, | 91 void DynamicsCompressor::process(const AudioBus* sourceBus, |
92 AudioBus* destinationBus, | 92 AudioBus* destinationBus, |
93 unsigned framesToProcess) { | 93 unsigned framesToProcess) { |
94 // Though numberOfChannels is retrived from destinationBus, we still name it | 94 // Though numberOfChannels is retrived from destinationBus, we still name it |
95 // numberOfChannels instead of numberOfDestinationChannels. It's because we | 95 // numberOfChannels instead of numberOfDestinationChannels. It's because we |
96 // internally match sourceChannels's size to destinationBus by channel | 96 // internally match sourceChannels's size to destinationBus by channel |
97 // up/down mix. Thus we need numberOfChannels | 97 // up/down mix. Thus we need numberOfChannels |
98 // to do the loop work for both m_sourceChannels and m_destinationChannels. | 98 // to do the loop work for both m_sourceChannels and m_destinationChannels. |
99 | 99 |
100 unsigned numberOfChannels = destinationBus->numberOfChannels(); | 100 unsigned numberOfChannels = destinationBus->numberOfChannels(); |
101 unsigned numberOfSourceChannels = sourceBus->numberOfChannels(); | 101 unsigned numberOfSourceChannels = sourceBus->numberOfChannels(); |
102 | 102 |
103 DCHECK_EQ(numberOfChannels, m_numberOfChannels); | 103 ASSERT(numberOfChannels == m_numberOfChannels && numberOfSourceChannels); |
104 DCHECK(numberOfSourceChannels); | |
105 | 104 |
106 if (numberOfChannels != m_numberOfChannels || !numberOfSourceChannels) { | 105 if (numberOfChannels != m_numberOfChannels || !numberOfSourceChannels) { |
107 destinationBus->zero(); | 106 destinationBus->zero(); |
108 return; | 107 return; |
109 } | 108 } |
110 | 109 |
111 switch (numberOfChannels) { | 110 switch (numberOfChannels) { |
112 case 2: // stereo | 111 case 2: // stereo |
113 m_sourceChannels[0] = sourceBus->channel(0)->data(); | 112 m_sourceChannels[0] = sourceBus->channel(0)->data(); |
114 | 113 |
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185 | 184 |
186 void DynamicsCompressor::setNumberOfChannels(unsigned numberOfChannels) { | 185 void DynamicsCompressor::setNumberOfChannels(unsigned numberOfChannels) { |
187 m_sourceChannels = wrapArrayUnique(new const float*[numberOfChannels]); | 186 m_sourceChannels = wrapArrayUnique(new const float*[numberOfChannels]); |
188 m_destinationChannels = wrapArrayUnique(new float*[numberOfChannels]); | 187 m_destinationChannels = wrapArrayUnique(new float*[numberOfChannels]); |
189 | 188 |
190 m_compressor.setNumberOfChannels(numberOfChannels); | 189 m_compressor.setNumberOfChannels(numberOfChannels); |
191 m_numberOfChannels = numberOfChannels; | 190 m_numberOfChannels = numberOfChannels; |
192 } | 191 } |
193 | 192 |
194 } // namespace blink | 193 } // namespace blink |
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