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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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23 */ | 23 */ |
24 | 24 |
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 <cmath> |
34 | 34 |
35 namespace blink { | 35 namespace blink { |
36 | 36 |
37 const float SmoothingTimeConstant = 0.020f; // 20ms | 37 const float SmoothingTimeConstant = 0.020f; // 20ms |
38 | 38 |
39 AudioDelayDSPKernel::AudioDelayDSPKernel(AudioDSPKernelProcessor* processor, siz
e_t processingSizeInFrames) | 39 AudioDelayDSPKernel::AudioDelayDSPKernel(AudioDSPKernelProcessor* processor, siz
e_t processingSizeInFrames) |
40 : AudioDSPKernel(processor) | 40 : AudioDSPKernel(processor) |
41 , m_writeIndex(0) | 41 , m_writeIndex(0) |
42 , m_firstTime(true) | 42 , m_firstTime(true) |
43 , m_delayTimes(processingSizeInFrames) | 43 , m_delayTimes(processingSizeInFrames) |
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106 double maxTime = maxDelayTime(); | 106 double maxTime = maxDelayTime(); |
107 | 107 |
108 bool sampleAccurate = hasSampleAccurateValues(); | 108 bool sampleAccurate = hasSampleAccurateValues(); |
109 | 109 |
110 if (sampleAccurate) { | 110 if (sampleAccurate) { |
111 calculateSampleAccurateValues(delayTimes, framesToProcess); | 111 calculateSampleAccurateValues(delayTimes, framesToProcess); |
112 } else { | 112 } else { |
113 delayTime = this->delayTime(sampleRate); | 113 delayTime = this->delayTime(sampleRate); |
114 | 114 |
115 // Make sure the delay time is in a valid range. | 115 // Make sure the delay time is in a valid range. |
116 delayTime = std::min(maxTime, delayTime); | 116 delayTime = clampTo(delayTime, 0.0, maxTime); |
117 delayTime = std::max(0.0, delayTime); | |
118 | 117 |
119 if (m_firstTime) { | 118 if (m_firstTime) { |
120 m_currentDelayTime = delayTime; | 119 m_currentDelayTime = delayTime; |
121 m_firstTime = false; | 120 m_firstTime = false; |
122 } | 121 } |
123 } | 122 } |
124 | 123 |
125 for (unsigned i = 0; i < framesToProcess; ++i) { | 124 for (unsigned i = 0; i < framesToProcess; ++i) { |
126 if (sampleAccurate) { | 125 if (sampleAccurate) { |
127 delayTime = delayTimes[i]; | 126 delayTime = delayTimes[i]; |
128 delayTime = std::min(maxTime, delayTime); | 127 delayTime = clampTo(delayTime, 0.0, maxTime); |
129 delayTime = std::max(0.0, delayTime); | |
130 m_currentDelayTime = delayTime; | 128 m_currentDelayTime = delayTime; |
131 } else { | 129 } else { |
132 // Approach desired delay time. | 130 // Approach desired delay time. |
133 m_currentDelayTime += (delayTime - m_currentDelayTime) * m_smoothing
Rate; | 131 m_currentDelayTime += (delayTime - m_currentDelayTime) * m_smoothing
Rate; |
134 } | 132 } |
135 | 133 |
136 double desiredDelayFrames = m_currentDelayTime * sampleRate; | 134 double desiredDelayFrames = m_currentDelayTime * sampleRate; |
137 | 135 |
138 double readPosition = m_writeIndex + bufferLength - desiredDelayFrames; | 136 double readPosition = m_writeIndex + bufferLength - desiredDelayFrames; |
139 if (readPosition >= bufferLength) | 137 if (readPosition >= bufferLength) |
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171 } | 169 } |
172 | 170 |
173 double AudioDelayDSPKernel::latencyTime() const | 171 double AudioDelayDSPKernel::latencyTime() const |
174 { | 172 { |
175 return 0; | 173 return 0; |
176 } | 174 } |
177 | 175 |
178 } // namespace blink | 176 } // namespace blink |
179 | 177 |
180 #endif // ENABLE(WEB_AUDIO) | 178 #endif // ENABLE(WEB_AUDIO) |
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