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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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41 DelayDSPKernel::DelayDSPKernel(DelayProcessor* processor) | 41 DelayDSPKernel::DelayDSPKernel(DelayProcessor* processor) |
42 : AudioDSPKernel(processor) | 42 : AudioDSPKernel(processor) |
43 , m_maxDelayTime(DefaultMaxDelayTime) | 43 , m_maxDelayTime(DefaultMaxDelayTime) |
44 , m_writeIndex(0) | 44 , m_writeIndex(0) |
45 , m_firstTime(true) | 45 , m_firstTime(true) |
46 { | 46 { |
47 ASSERT(processor && processor->sampleRate() > 0); | 47 ASSERT(processor && processor->sampleRate() > 0); |
48 if (!processor) | 48 if (!processor) |
49 return; | 49 return; |
50 | 50 |
51 m_buffer.resize(static_cast<size_t>(processor->sampleRate() * DefaultMaxDela
yTime)); | 51 m_buffer.allocate(static_cast<size_t>(processor->sampleRate() * DefaultMaxDe
layTime)); |
52 m_buffer.zero(); | 52 m_buffer.zero(); |
53 | 53 |
54 m_smoothingRate = AudioUtilities::discreteTimeConstantForSampleRate(Smoothin
gTimeConstant, processor->sampleRate()); | 54 m_smoothingRate = AudioUtilities::discreteTimeConstantForSampleRate(Smoothin
gTimeConstant, processor->sampleRate()); |
55 } | 55 } |
56 | 56 |
57 DelayDSPKernel::DelayDSPKernel(double maxDelayTime, double sampleRate) | 57 DelayDSPKernel::DelayDSPKernel(double maxDelayTime, double sampleRate) |
58 : AudioDSPKernel(sampleRate) | 58 : AudioDSPKernel(sampleRate) |
59 , m_maxDelayTime(maxDelayTime) | 59 , m_maxDelayTime(maxDelayTime) |
60 , m_writeIndex(0) | 60 , m_writeIndex(0) |
61 , m_firstTime(true) | 61 , m_firstTime(true) |
62 { | 62 { |
63 ASSERT(maxDelayTime > 0.0); | 63 ASSERT(maxDelayTime > 0.0); |
64 if (maxDelayTime <= 0.0) | 64 if (maxDelayTime <= 0.0) |
65 return; | 65 return; |
66 | 66 |
67 size_t bufferLength = static_cast<size_t>(sampleRate * maxDelayTime); | 67 size_t bufferLength = static_cast<size_t>(sampleRate * maxDelayTime); |
68 ASSERT(bufferLength); | 68 ASSERT(bufferLength); |
69 if (!bufferLength) | 69 if (!bufferLength) |
70 return; | 70 return; |
71 | 71 |
72 m_buffer.resize(bufferLength); | 72 m_buffer.allocate(bufferLength); |
73 m_buffer.zero(); | 73 m_buffer.zero(); |
74 | 74 |
75 m_smoothingRate = AudioUtilities::discreteTimeConstantForSampleRate(Smoothin
gTimeConstant, sampleRate); | 75 m_smoothingRate = AudioUtilities::discreteTimeConstantForSampleRate(Smoothin
gTimeConstant, sampleRate); |
76 } | 76 } |
77 | 77 |
78 void DelayDSPKernel::process(const float* source, float* destination, size_t fra
mesToProcess) | 78 void DelayDSPKernel::process(const float* source, float* destination, size_t fra
mesToProcess) |
79 { | 79 { |
80 size_t bufferLength = m_buffer.size(); | 80 size_t bufferLength = m_buffer.size(); |
81 float* buffer = m_buffer.data(); | 81 float* buffer = m_buffer.data(); |
82 | 82 |
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131 | 131 |
132 void DelayDSPKernel::reset() | 132 void DelayDSPKernel::reset() |
133 { | 133 { |
134 m_firstTime = true; | 134 m_firstTime = true; |
135 m_buffer.zero(); | 135 m_buffer.zero(); |
136 } | 136 } |
137 | 137 |
138 } // namespace WebCore | 138 } // namespace WebCore |
139 | 139 |
140 #endif // ENABLE(WEB_AUDIO) | 140 #endif // ENABLE(WEB_AUDIO) |
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