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1 /* | 1 /* |
2 * Copyright (C) 2010, Google Inc. All rights reserved. | 2 * Copyright (C) 2010, 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 * 1. Redistributions of source code must retain the above copyright | 7 * 1. Redistributions of source code must retain the above copyright |
8 * notice, this list of conditions and the following disclaimer. | 8 * notice, this list of conditions and the following disclaimer. |
9 * 2. Redistributions in binary form must reproduce the above copyright | 9 * 2. Redistributions in binary form must reproduce the above copyright |
10 * notice, this list of conditions and the following disclaimer in the | 10 * notice, this list of conditions and the following disclaimer in the |
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25 #include "config.h" | 25 #include "config.h" |
26 | 26 |
27 #if ENABLE(WEB_AUDIO) | 27 #if ENABLE(WEB_AUDIO) |
28 | 28 |
29 #include "platform/audio/AudioDelayDSPKernel.h" | 29 #include "platform/audio/AudioDelayDSPKernel.h" |
30 | 30 |
31 #include "platform/audio/AudioUtilities.h" | 31 #include "platform/audio/AudioUtilities.h" |
32 #include "wtf/MathExtras.h" | 32 #include "wtf/MathExtras.h" |
33 #include <algorithm> | 33 #include <algorithm> |
34 | 34 |
35 using namespace std; | |
36 | |
37 namespace blink { | 35 namespace blink { |
38 | 36 |
39 const float SmoothingTimeConstant = 0.020f; // 20ms | 37 const float SmoothingTimeConstant = 0.020f; // 20ms |
40 | 38 |
41 AudioDelayDSPKernel::AudioDelayDSPKernel(AudioDSPKernelProcessor* processor, siz
e_t processingSizeInFrames) | 39 AudioDelayDSPKernel::AudioDelayDSPKernel(AudioDSPKernelProcessor* processor, siz
e_t processingSizeInFrames) |
42 : AudioDSPKernel(processor) | 40 : AudioDSPKernel(processor) |
43 , m_writeIndex(0) | 41 , m_writeIndex(0) |
44 , m_firstTime(true) | 42 , m_firstTime(true) |
45 , m_delayTimes(processingSizeInFrames) | 43 , m_delayTimes(processingSizeInFrames) |
46 { | 44 { |
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108 double maxTime = maxDelayTime(); | 106 double maxTime = maxDelayTime(); |
109 | 107 |
110 bool sampleAccurate = hasSampleAccurateValues(); | 108 bool sampleAccurate = hasSampleAccurateValues(); |
111 | 109 |
112 if (sampleAccurate) { | 110 if (sampleAccurate) { |
113 calculateSampleAccurateValues(delayTimes, framesToProcess); | 111 calculateSampleAccurateValues(delayTimes, framesToProcess); |
114 } else { | 112 } else { |
115 delayTime = this->delayTime(sampleRate); | 113 delayTime = this->delayTime(sampleRate); |
116 | 114 |
117 // Make sure the delay time is in a valid range. | 115 // Make sure the delay time is in a valid range. |
118 delayTime = min(maxTime, delayTime); | 116 delayTime = std::min(maxTime, delayTime); |
119 delayTime = max(0.0, delayTime); | 117 delayTime = std::max(0.0, delayTime); |
120 | 118 |
121 if (m_firstTime) { | 119 if (m_firstTime) { |
122 m_currentDelayTime = delayTime; | 120 m_currentDelayTime = delayTime; |
123 m_firstTime = false; | 121 m_firstTime = false; |
124 } | 122 } |
125 } | 123 } |
126 | 124 |
127 for (unsigned i = 0; i < framesToProcess; ++i) { | 125 for (unsigned i = 0; i < framesToProcess; ++i) { |
128 if (sampleAccurate) { | 126 if (sampleAccurate) { |
129 delayTime = delayTimes[i]; | 127 delayTime = delayTimes[i]; |
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173 } | 171 } |
174 | 172 |
175 double AudioDelayDSPKernel::latencyTime() const | 173 double AudioDelayDSPKernel::latencyTime() const |
176 { | 174 { |
177 return 0; | 175 return 0; |
178 } | 176 } |
179 | 177 |
180 } // namespace blink | 178 } // namespace blink |
181 | 179 |
182 #endif // ENABLE(WEB_AUDIO) | 180 #endif // ENABLE(WEB_AUDIO) |
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