1 /*
2 * Copyright (C) 2010, Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
16 * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
17 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
18 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
19 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
20 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
22 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23 */
24
25 #include "config.h"
26
27 #if ENABLE(WEB_AUDIO)
28
29 #include "modules/webaudio/DelayDSPKernel.h"
30
31 #include "platform/audio/AudioUtilities.h"
32 #include "wtf/MathExtras.h"
33 #include <algorithm>
34
35 namespace blink {
36
37 const float SmoothingTimeConstant = 0.020f; // 20ms
38
DelayDSPKernel(DelayProcessor * processor)39 DelayDSPKernel::DelayDSPKernel(DelayProcessor* processor)
40 : AudioDelayDSPKernel(processor, AudioNode::ProcessingSizeInFrames)
41 {
42 ASSERT(processor && processor->sampleRate() > 0);
43 if (!(processor && processor->sampleRate() > 0))
44 return;
45
46 m_maxDelayTime = processor->maxDelayTime();
47 ASSERT(m_maxDelayTime >= 0 && !std::isnan(m_maxDelayTime));
48 if (m_maxDelayTime < 0 || std::isnan(m_maxDelayTime))
49 return;
50
51 m_buffer.allocate(bufferLengthForDelay(m_maxDelayTime, processor->sampleRate()));
52 m_buffer.zero();
53
54 m_smoothingRate = AudioUtilities::discreteTimeConstantForSampleRate(SmoothingTimeConstant, processor->sampleRate());
55 }
56
hasSampleAccurateValues()57 bool DelayDSPKernel::hasSampleAccurateValues()
58 {
59 return delayProcessor()->delayTime()->hasSampleAccurateValues();
60 }
61
calculateSampleAccurateValues(float * delayTimes,size_t framesToProcess)62 void DelayDSPKernel::calculateSampleAccurateValues(float* delayTimes, size_t framesToProcess)
63 {
64 delayProcessor()->delayTime()->calculateSampleAccurateValues(delayTimes, framesToProcess);
65 }
66
delayTime(float)67 double DelayDSPKernel::delayTime(float)
68 {
69 return delayProcessor()->delayTime()->finalValue();
70 }
71
72 } // namespace blink
73
74 #endif // ENABLE(WEB_AUDIO)
75