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#ifndef AudioBasicProcessorNode_h
26#define AudioBasicProcessorNode_h
27
28#include "modules/webaudio/AudioNode.h"
29#include "wtf/Forward.h"
30#include "wtf/Threading.h"
31
32namespace blink {
33
34class AudioBus;
35class AudioNodeInput;
36class AudioProcessor;
37
38// AudioBasicProcessorNode is an AudioNode with one input and one output where the input and output have the same number of channels.
39class AudioBasicProcessorNode : public AudioNode {
40public:
41    AudioBasicProcessorNode(AudioContext*, float sampleRate);
42    virtual ~AudioBasicProcessorNode();
43    virtual void trace(Visitor*) OVERRIDE;
44
45    // AudioNode
46    virtual void dispose() OVERRIDE FINAL;
47    virtual void process(size_t framesToProcess) OVERRIDE FINAL;
48    virtual void pullInputs(size_t framesToProcess) OVERRIDE FINAL;
49    virtual void initialize() OVERRIDE FINAL;
50    virtual void uninitialize() OVERRIDE FINAL;
51
52    // Called in the main thread when the number of channels for the input may have changed.
53    virtual void checkNumberOfChannelsForInput(AudioNodeInput*) OVERRIDE FINAL;
54
55    // Returns the number of channels for both the input and the output.
56    unsigned numberOfChannels();
57
58protected:
59    virtual double tailTime() const OVERRIDE FINAL;
60    virtual double latencyTime() const OVERRIDE FINAL;
61
62    AudioProcessor* processor() { return m_processor.get(); }
63    Member<AudioProcessor> m_processor;
64};
65
66} // namespace blink
67
68#endif // AudioBasicProcessorNode_h
69