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 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#pragma once
30
31#include "AudioNode.h"
32
33namespace WebCore {
34
35class AudioContext;
36
37class ChannelMergerNode final : public AudioNode {
38 WTF_MAKE_ISO_ALLOCATED(ChannelMergerNode);
39public:
40 static RefPtr<ChannelMergerNode> create(AudioContext&, float sampleRate, unsigned numberOfInputs);
41
42 // AudioNode
43 void process(size_t framesToProcess) override;
44 void reset() override;
45
46 // Called in the audio thread (pre-rendering task) when the number of channels for an input may have changed.
47 void checkNumberOfChannelsForInput(AudioNodeInput*) override;
48
49private:
50 unsigned m_desiredNumberOfOutputChannels;
51
52 double tailTime() const override { return 0; }
53 double latencyTime() const override { return 0; }
54
55 ChannelMergerNode(AudioContext&, float sampleRate, unsigned numberOfInputs);
56};
57
58} // namespace WebCore
59