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 *
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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,
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29 */
30
31#ifndef AudioDSPKernelProcessor_h
32#define AudioDSPKernelProcessor_h
33
34#include "AudioBus.h"
35#include "AudioProcessor.h"
36#include <wtf/Vector.h>
37
38namespace WebCore {
39
40class AudioBus;
41class AudioDSPKernel;
42class AudioProcessor;
43
44// AudioDSPKernelProcessor processes one input -> one output (N channels each)
45// It uses one AudioDSPKernel object per channel to do the processing, thus there is no cross-channel processing.
46// Despite this limitation it turns out to be a very common and useful type of processor.
47
48class AudioDSPKernelProcessor : public AudioProcessor {
49public:
50 // numberOfChannels may be later changed if object is not yet in an "initialized" state
51 AudioDSPKernelProcessor(float sampleRate, unsigned numberOfChannels);
52
53 // Subclasses create the appropriate type of processing kernel here.
54 // We'll call this to create a kernel for each channel.
55 virtual std::unique_ptr<AudioDSPKernel> createKernel() = 0;
56
57 // AudioProcessor methods
58 void initialize() override;
59 void uninitialize() override;
60 void process(const AudioBus* source, AudioBus* destination, size_t framesToProcess) override;
61 void reset() override;
62 void setNumberOfChannels(unsigned) override;
63 unsigned numberOfChannels() const override { return m_numberOfChannels; }
64
65 double tailTime() const override;
66 double latencyTime() const override;
67
68protected:
69 Vector<std::unique_ptr<AudioDSPKernel>> m_kernels;
70 bool m_hasJustReset;
71};
72
73} // namespace WebCore
74
75#endif // AudioDSPKernelProcessor_h
76