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 | |
33 | namespace WebCore { |
34 | |
35 | class AudioContext; |
36 | |
37 | class ChannelMergerNode final : public AudioNode { |
38 | WTF_MAKE_ISO_ALLOCATED(ChannelMergerNode); |
39 | public: |
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 | |
49 | private: |
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 | |