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 *
8 * 1.  Redistributions of source code must retain the above copyright
9 *     notice, this list of conditions and the following disclaimer.
10 * 2.  Redistributions in binary form must reproduce the above copyright
11 *     notice, this list of conditions and the following disclaimer in the
12 *     documentation and/or other materials provided with the distribution.
13 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
14 *     its contributors may be used to endorse or promote products derived
15 *     from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#ifndef ChannelMergerNode_h
30#define ChannelMergerNode_h
31
32#include "modules/webaudio/AudioNode.h"
33#include "wtf/PassRefPtr.h"
34
35namespace WebCore {
36
37class AudioContext;
38
39class ChannelMergerNode : public AudioNode {
40public:
41    static PassRefPtr<ChannelMergerNode> create(AudioContext*, float sampleRate, unsigned numberOfInputs);
42
43    // AudioNode
44    virtual void process(size_t framesToProcess);
45    virtual void reset();
46
47    // Called in the audio thread (pre-rendering task) when the number of channels for an input may have changed.
48    virtual void checkNumberOfChannelsForInput(AudioNodeInput*);
49
50private:
51    unsigned m_desiredNumberOfOutputChannels;
52
53    virtual double tailTime() const OVERRIDE { return 0; }
54    virtual double latencyTime() const OVERRIDE { return 0; }
55
56    ChannelMergerNode(AudioContext*, float sampleRate, unsigned numberOfInputs);
57};
58
59} // namespace WebCore
60
61#endif // ChannelMergerNode_h
62