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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 |
11 * documentation and/or other materials provided with the distribution. | 11 * documentation and/or other materials provided with the distribution. |
12 * | 12 * |
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND AN
Y | 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND |
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | 14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
16 * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR AN
Y | 16 * ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE |
17 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | 17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
18 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
19 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND O
N | 19 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
20 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | 20 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
22 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH |
| 23 * DAMAGE. |
23 */ | 24 */ |
24 | 25 |
25 #include "platform/audio/AudioDelayDSPKernel.h" | 26 #include "platform/audio/AudioDelayDSPKernel.h" |
26 #include "platform/audio/AudioUtilities.h" | 27 #include "platform/audio/AudioUtilities.h" |
27 #include "wtf/MathExtras.h" | 28 #include "wtf/MathExtras.h" |
28 #include <cmath> | 29 #include <cmath> |
29 | 30 |
30 namespace blink { | 31 namespace blink { |
31 | 32 |
32 const float SmoothingTimeConstant = 0.020f; // 20ms | 33 const float SmoothingTimeConstant = 0.020f; // 20ms |
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54 | 55 |
55 m_buffer.allocate(bufferLength); | 56 m_buffer.allocate(bufferLength); |
56 m_buffer.zero(); | 57 m_buffer.zero(); |
57 | 58 |
58 m_smoothingRate = AudioUtilities::discreteTimeConstantForSampleRate( | 59 m_smoothingRate = AudioUtilities::discreteTimeConstantForSampleRate( |
59 SmoothingTimeConstant, sampleRate); | 60 SmoothingTimeConstant, sampleRate); |
60 } | 61 } |
61 | 62 |
62 size_t AudioDelayDSPKernel::bufferLengthForDelay(double maxDelayTime, | 63 size_t AudioDelayDSPKernel::bufferLengthForDelay(double maxDelayTime, |
63 double sampleRate) const { | 64 double sampleRate) const { |
64 // Compute the length of the buffer needed to handle a max delay of |maxDelayT
ime|. One is | 65 // Compute the length of the buffer needed to handle a max delay of |
65 // added to handle the case where the actual delay equals the maximum delay. | 66 // |maxDelayTime|. One is added to handle the case where the actual delay |
| 67 // equals the maximum delay. |
66 return 1 + AudioUtilities::timeToSampleFrame(maxDelayTime, sampleRate); | 68 return 1 + AudioUtilities::timeToSampleFrame(maxDelayTime, sampleRate); |
67 } | 69 } |
68 | 70 |
69 bool AudioDelayDSPKernel::hasSampleAccurateValues() { | 71 bool AudioDelayDSPKernel::hasSampleAccurateValues() { |
70 return false; | 72 return false; |
71 } | 73 } |
72 | 74 |
73 void AudioDelayDSPKernel::calculateSampleAccurateValues(float*, size_t) { | 75 void AudioDelayDSPKernel::calculateSampleAccurateValues(float*, size_t) { |
74 ASSERT_NOT_REACHED(); | 76 ASSERT_NOT_REACHED(); |
75 } | 77 } |
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160 // Account for worst case delay. | 162 // Account for worst case delay. |
161 // Don't try to track actual delay time which can change dynamically. | 163 // Don't try to track actual delay time which can change dynamically. |
162 return m_maxDelayTime; | 164 return m_maxDelayTime; |
163 } | 165 } |
164 | 166 |
165 double AudioDelayDSPKernel::latencyTime() const { | 167 double AudioDelayDSPKernel::latencyTime() const { |
166 return 0; | 168 return 0; |
167 } | 169 } |
168 | 170 |
169 } // namespace blink | 171 } // namespace blink |
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