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
31namespace WebCore {
32
33class DelayProcessor;
34
35class DelayDSPKernel final : public AudioDSPKernel {
36public:
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
50private:
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