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 | #include "config.h" |
26 | |
27 | #if ENABLE(WEB_AUDIO) |
28 | |
29 | #include "ChannelSplitterNode.h" |
30 | |
31 | #include "AudioContext.h" |
32 | #include "AudioNodeInput.h" |
33 | #include "AudioNodeOutput.h" |
34 | #include <wtf/IsoMallocInlines.h> |
35 | |
36 | namespace WebCore { |
37 | |
38 | WTF_MAKE_ISO_ALLOCATED_IMPL(ChannelSplitterNode); |
39 | |
40 | RefPtr<ChannelSplitterNode> ChannelSplitterNode::create(AudioContext& context, float sampleRate, unsigned numberOfOutputs) |
41 | { |
42 | if (!numberOfOutputs || numberOfOutputs > AudioContext::maxNumberOfChannels()) |
43 | return nullptr; |
44 | |
45 | return adoptRef(*new ChannelSplitterNode(context, sampleRate, numberOfOutputs)); |
46 | } |
47 | |
48 | ChannelSplitterNode::ChannelSplitterNode(AudioContext& context, float sampleRate, unsigned numberOfOutputs) |
49 | : AudioNode(context, sampleRate) |
50 | { |
51 | setNodeType(NodeTypeChannelSplitter); |
52 | |
53 | addInput(std::make_unique<AudioNodeInput>(this)); |
54 | |
55 | // Create a fixed number of outputs (able to handle the maximum number of channels fed to an input). |
56 | for (unsigned i = 0; i < numberOfOutputs; ++i) |
57 | addOutput(std::make_unique<AudioNodeOutput>(this, 1)); |
58 | |
59 | initialize(); |
60 | } |
61 | |
62 | void ChannelSplitterNode::process(size_t framesToProcess) |
63 | { |
64 | AudioBus* source = input(0)->bus(); |
65 | ASSERT(source); |
66 | ASSERT_UNUSED(framesToProcess, framesToProcess == source->length()); |
67 | |
68 | unsigned numberOfSourceChannels = source->numberOfChannels(); |
69 | |
70 | for (unsigned i = 0; i < numberOfOutputs(); ++i) { |
71 | AudioBus* destination = output(i)->bus(); |
72 | ASSERT(destination); |
73 | |
74 | if (i < numberOfSourceChannels) { |
75 | // Split the channel out if it exists in the source. |
76 | // It would be nice to avoid the copy and simply pass along pointers, but this becomes extremely difficult with fanout and fanin. |
77 | destination->channel(0)->copyFrom(source->channel(i)); |
78 | } else if (output(i)->renderingFanOutCount() > 0) { |
79 | // Only bother zeroing out the destination if it's connected to anything |
80 | destination->zero(); |
81 | } |
82 | } |
83 | } |
84 | |
85 | void ChannelSplitterNode::reset() |
86 | { |
87 | } |
88 | |
89 | } // namespace WebCore |
90 | |
91 | #endif // ENABLE(WEB_AUDIO) |
92 | |