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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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84 } | 84 } |
85 | 85 |
86 float DynamicsCompressor::parameterValue(unsigned parameterID) { | 86 float DynamicsCompressor::parameterValue(unsigned parameterID) { |
87 ASSERT(parameterID < 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 n
umberOfChannels instead of numberOfDestinationChannels. | 94 // Though numberOfChannels is retrived from destinationBus, we still name it |
95 // It's because we internally match sourceChannels's size to destinationBus by
channel up/down mix. Thus we need numberOfChannels | 95 // numberOfChannels instead of numberOfDestinationChannels. It's because we |
| 96 // internally match sourceChannels's size to destinationBus by channel |
| 97 // up/down mix. Thus we need numberOfChannels |
96 // 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. |
97 | 99 |
98 unsigned numberOfChannels = destinationBus->numberOfChannels(); | 100 unsigned numberOfChannels = destinationBus->numberOfChannels(); |
99 unsigned numberOfSourceChannels = sourceBus->numberOfChannels(); | 101 unsigned numberOfSourceChannels = sourceBus->numberOfChannels(); |
100 | 102 |
101 ASSERT(numberOfChannels == m_numberOfChannels && numberOfSourceChannels); | 103 ASSERT(numberOfChannels == m_numberOfChannels && numberOfSourceChannels); |
102 | 104 |
103 if (numberOfChannels != m_numberOfChannels || !numberOfSourceChannels) { | 105 if (numberOfChannels != m_numberOfChannels || !numberOfSourceChannels) { |
104 destinationBus->zero(); | 106 destinationBus->zero(); |
105 return; | 107 return; |
106 } | 108 } |
107 | 109 |
108 switch (numberOfChannels) { | 110 switch (numberOfChannels) { |
109 case 2: // stereo | 111 case 2: // stereo |
110 m_sourceChannels[0] = sourceBus->channel(0)->data(); | 112 m_sourceChannels[0] = sourceBus->channel(0)->data(); |
111 | 113 |
112 if (numberOfSourceChannels > 1) | 114 if (numberOfSourceChannels > 1) |
113 m_sourceChannels[1] = sourceBus->channel(1)->data(); | 115 m_sourceChannels[1] = sourceBus->channel(1)->data(); |
114 else | 116 else |
115 // Simply duplicate mono channel input data to right channel for stereo
processing. | 117 // Simply duplicate mono channel input data to right channel for stereo |
| 118 // processing. |
116 m_sourceChannels[1] = m_sourceChannels[0]; | 119 m_sourceChannels[1] = m_sourceChannels[0]; |
117 | 120 |
118 break; | 121 break; |
119 default: | 122 default: |
120 // FIXME : support other number of channels. | 123 // FIXME : support other number of channels. |
121 ASSERT_NOT_REACHED(); | 124 ASSERT_NOT_REACHED(); |
122 destinationBus->zero(); | 125 destinationBus->zero(); |
123 return; | 126 return; |
124 } | 127 } |
125 | 128 |
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137 m_lastAnchor = anchor; | 140 m_lastAnchor = anchor; |
138 } | 141 } |
139 | 142 |
140 float dbThreshold = parameterValue(ParamThreshold); | 143 float dbThreshold = parameterValue(ParamThreshold); |
141 float dbKnee = parameterValue(ParamKnee); | 144 float dbKnee = parameterValue(ParamKnee); |
142 float ratio = parameterValue(ParamRatio); | 145 float ratio = parameterValue(ParamRatio); |
143 float attackTime = parameterValue(ParamAttack); | 146 float attackTime = parameterValue(ParamAttack); |
144 float releaseTime = parameterValue(ParamRelease); | 147 float releaseTime = parameterValue(ParamRelease); |
145 float preDelayTime = parameterValue(ParamPreDelay); | 148 float preDelayTime = parameterValue(ParamPreDelay); |
146 | 149 |
147 // This is effectively a master volume on the compressed signal (pre-blending)
. | 150 // This is effectively a master volume on the compressed signal |
| 151 // (pre-blending). |
148 float dbPostGain = parameterValue(ParamPostGain); | 152 float dbPostGain = parameterValue(ParamPostGain); |
149 | 153 |
150 // Linear blending value from dry to completely processed (0 -> 1) | 154 // Linear blending value from dry to completely processed (0 -> 1) |
151 // 0 means the signal is completely unprocessed. | 155 // 0 means the signal is completely unprocessed. |
152 // 1 mixes in only the compressed signal. | 156 // 1 mixes in only the compressed signal. |
153 float effectBlend = parameterValue(ParamEffectBlend); | 157 float effectBlend = parameterValue(ParamEffectBlend); |
154 | 158 |
155 float releaseZone1 = parameterValue(ParamReleaseZone1); | 159 float releaseZone1 = parameterValue(ParamReleaseZone1); |
156 float releaseZone2 = parameterValue(ParamReleaseZone2); | 160 float releaseZone2 = parameterValue(ParamReleaseZone2); |
157 float releaseZone3 = parameterValue(ParamReleaseZone3); | 161 float releaseZone3 = parameterValue(ParamReleaseZone3); |
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180 | 184 |
181 void DynamicsCompressor::setNumberOfChannels(unsigned numberOfChannels) { | 185 void DynamicsCompressor::setNumberOfChannels(unsigned numberOfChannels) { |
182 m_sourceChannels = wrapArrayUnique(new const float*[numberOfChannels]); | 186 m_sourceChannels = wrapArrayUnique(new const float*[numberOfChannels]); |
183 m_destinationChannels = wrapArrayUnique(new float*[numberOfChannels]); | 187 m_destinationChannels = wrapArrayUnique(new float*[numberOfChannels]); |
184 | 188 |
185 m_compressor.setNumberOfChannels(numberOfChannels); | 189 m_compressor.setNumberOfChannels(numberOfChannels); |
186 m_numberOfChannels = numberOfChannels; | 190 m_numberOfChannels = numberOfChannels; |
187 } | 191 } |
188 | 192 |
189 } // namespace blink | 193 } // namespace blink |
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