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 are
6 * met:
7 *
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 * * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#ifndef AudioDSPKernel_h
32#define AudioDSPKernel_h
33
34#include "AudioDSPKernelProcessor.h"
35
36namespace WebCore {
37
38// AudioDSPKernel does the processing for one channel of an AudioDSPKernelProcessor.
39
40class AudioDSPKernel {
41 WTF_MAKE_NONCOPYABLE(AudioDSPKernel);
42 WTF_MAKE_FAST_ALLOCATED;
43public:
44 AudioDSPKernel(AudioDSPKernelProcessor* kernelProcessor)
45 : m_kernelProcessor(kernelProcessor)
46 , m_sampleRate(kernelProcessor->sampleRate())
47 {
48 }
49
50 AudioDSPKernel(float sampleRate)
51 : m_kernelProcessor(0)
52 , m_sampleRate(sampleRate)
53 {
54 }
55
56 virtual ~AudioDSPKernel() { };
57
58 // Subclasses must override process() to do the processing and reset() to reset DSP state.
59 virtual void process(const float* source, float* destination, size_t framesToProcess) = 0;
60 virtual void reset() = 0;
61
62 float sampleRate() const { return m_sampleRate; }
63 double nyquist() const { return 0.5 * sampleRate(); }
64
65 AudioDSPKernelProcessor* processor() { return m_kernelProcessor; }
66 const AudioDSPKernelProcessor* processor() const { return m_kernelProcessor; }
67
68 virtual double tailTime() const = 0;
69 virtual double latencyTime() const = 0;
70
71protected:
72 AudioDSPKernelProcessor* m_kernelProcessor;
73 float m_sampleRate;
74};
75
76} // namespace WebCore
77
78#endif // AudioDSPKernel_h
79