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 | #pragma once |
26 | |
27 | #include "AudioArray.h" |
28 | #include "AudioDSPKernel.h" |
29 | #include "DelayProcessor.h" |
30 | |
31 | namespace WebCore { |
32 | |
33 | class DelayProcessor; |
34 | |
35 | class DelayDSPKernel final : public AudioDSPKernel { |
36 | public: |
37 | explicit DelayDSPKernel(DelayProcessor*); |
38 | DelayDSPKernel(double maxDelayTime, float sampleRate); |
39 | |
40 | void process(const float* source, float* destination, size_t framesToProcess) override; |
41 | void reset() override; |
42 | |
43 | double maxDelayTime() const { return m_maxDelayTime; } |
44 | |
45 | void setDelayFrames(double numberOfFrames) { m_desiredDelayFrames = numberOfFrames; } |
46 | |
47 | double tailTime() const override; |
48 | double latencyTime() const override; |
49 | |
50 | private: |
51 | AudioFloatArray m_buffer; |
52 | double m_maxDelayTime; |
53 | int m_writeIndex; |
54 | double m_currentDelayTime; |
55 | double m_smoothingRate; |
56 | bool m_firstTime; |
57 | double m_desiredDelayFrames; |
58 | |
59 | AudioFloatArray m_delayTimes; |
60 | |
61 | DelayProcessor* delayProcessor() { return static_cast<DelayProcessor*>(processor()); } |
62 | size_t bufferLengthForDelay(double delayTime, double sampleRate) const; |
63 | }; |
64 | |
65 | } // namespace WebCore |
66 | |