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1 /* | 1 /* |
2 * Copyright (C) 2010 Google Inc. All rights reserved. | 2 * Copyright (C) 2010 Google Inc. All rights reserved. |
3 * | 3 * |
4 * Redistribution and use in source and binary forms, with or without | 4 * Redistribution and use in source and binary forms, with or without |
5 * modification, are permitted provided that the following conditions | 5 * modification, are permitted provided that the following conditions |
6 * are met: | 6 * are met: |
7 * | 7 * |
8 * 1. Redistributions of source code must retain the above copyright | 8 * 1. Redistributions of source code must retain the above copyright |
9 * notice, this list of conditions and the following disclaimer. | 9 * notice, this list of conditions and the following disclaimer. |
10 * 2. Redistributions in binary form must reproduce the above copyright | 10 * 2. Redistributions in binary form must reproduce the above copyright |
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37 #include "modules/webaudio/AudioNodeOutput.h" | 37 #include "modules/webaudio/AudioNodeOutput.h" |
38 | 38 |
39 const unsigned DefaultNumberOfOutputChannels = 1; | 39 const unsigned DefaultNumberOfOutputChannels = 1; |
40 | 40 |
41 namespace WebCore { | 41 namespace WebCore { |
42 | 42 |
43 PassRefPtr<ChannelMergerNode> ChannelMergerNode::create(AudioContext* context, f
loat sampleRate, unsigned numberOfInputs) | 43 PassRefPtr<ChannelMergerNode> ChannelMergerNode::create(AudioContext* context, f
loat sampleRate, unsigned numberOfInputs) |
44 { | 44 { |
45 if (!numberOfInputs || numberOfInputs > AudioContext::maxNumberOfChannels()) | 45 if (!numberOfInputs || numberOfInputs > AudioContext::maxNumberOfChannels()) |
46 return 0; | 46 return 0; |
47 | 47 |
48 return adoptRef(new ChannelMergerNode(context, sampleRate, numberOfInputs));
| 48 return adoptRef(new ChannelMergerNode(context, sampleRate, numberOfInputs)); |
49 } | 49 } |
50 | 50 |
51 ChannelMergerNode::ChannelMergerNode(AudioContext* context, float sampleRate, un
signed numberOfInputs) | 51 ChannelMergerNode::ChannelMergerNode(AudioContext* context, float sampleRate, un
signed numberOfInputs) |
52 : AudioNode(context, sampleRate) | 52 : AudioNode(context, sampleRate) |
53 , m_desiredNumberOfOutputChannels(DefaultNumberOfOutputChannels) | 53 , m_desiredNumberOfOutputChannels(DefaultNumberOfOutputChannels) |
54 { | 54 { |
55 ScriptWrappable::init(this); | 55 ScriptWrappable::init(this); |
56 // Create the requested number of inputs. | 56 // Create the requested number of inputs. |
57 for (unsigned i = 0; i < numberOfInputs; ++i) | 57 for (unsigned i = 0; i < numberOfInputs; ++i) |
58 addInput(adoptPtr(new AudioNodeInput(this))); | 58 addInput(adoptPtr(new AudioNodeInput(this))); |
59 | 59 |
60 addOutput(adoptPtr(new AudioNodeOutput(this, 1))); | 60 addOutput(adoptPtr(new AudioNodeOutput(this, 1))); |
61 setNodeType(NodeTypeChannelMerger); | 61 setNodeType(NodeTypeChannelMerger); |
62 initialize(); | 62 initialize(); |
63 } | 63 } |
64 | 64 |
65 void ChannelMergerNode::process(size_t framesToProcess) | 65 void ChannelMergerNode::process(size_t framesToProcess) |
66 { | 66 { |
67 AudioNodeOutput* output = this->output(0); | 67 AudioNodeOutput* output = this->output(0); |
68 ASSERT(output); | 68 ASSERT(output); |
69 ASSERT_UNUSED(framesToProcess, framesToProcess == output->bus()->length()); | 69 ASSERT_UNUSED(framesToProcess, framesToProcess == output->bus()->length()); |
70 | 70 |
71 // Output bus not updated yet, so just output silence. | 71 // Output bus not updated yet, so just output silence. |
72 if (m_desiredNumberOfOutputChannels != output->numberOfChannels()) { | 72 if (m_desiredNumberOfOutputChannels != output->numberOfChannels()) { |
73 output->bus()->zero(); | 73 output->bus()->zero(); |
74 return; | 74 return; |
75 } | 75 } |
76 | 76 |
77 // Merge all the channels from all the inputs into one output. | 77 // Merge all the channels from all the inputs into one output. |
78 unsigned outputChannelIndex = 0; | 78 unsigned outputChannelIndex = 0; |
79 for (unsigned i = 0; i < numberOfInputs(); ++i) { | 79 for (unsigned i = 0; i < numberOfInputs(); ++i) { |
80 AudioNodeInput* input = this->input(i); | 80 AudioNodeInput* input = this->input(i); |
81 if (input->isConnected()) { | 81 if (input->isConnected()) { |
82 unsigned numberOfInputChannels = input->bus()->numberOfChannels(); | 82 unsigned numberOfInputChannels = input->bus()->numberOfChannels(); |
83 | 83 |
84 // Merge channels from this particular input. | 84 // Merge channels from this particular input. |
85 for (unsigned j = 0; j < numberOfInputChannels; ++j) { | 85 for (unsigned j = 0; j < numberOfInputChannels; ++j) { |
86 AudioChannel* inputChannel = input->bus()->channel(j); | 86 AudioChannel* inputChannel = input->bus()->channel(j); |
87 AudioChannel* outputChannel = output->bus()->channel(outputChann
elIndex); | 87 AudioChannel* outputChannel = output->bus()->channel(outputChann
elIndex); |
88 outputChannel->copyFrom(inputChannel); | 88 outputChannel->copyFrom(inputChannel); |
89 | 89 |
90 ++outputChannelIndex; | 90 ++outputChannelIndex; |
91 } | 91 } |
92 } | 92 } |
93 } | 93 } |
94 | 94 |
95 ASSERT(outputChannelIndex == output->numberOfChannels()); | 95 ASSERT(outputChannelIndex == output->numberOfChannels()); |
96 } | 96 } |
97 | 97 |
98 void ChannelMergerNode::reset() | 98 void ChannelMergerNode::reset() |
99 { | 99 { |
100 } | 100 } |
101 | 101 |
102 // Any time a connection or disconnection happens on any of our inputs, we poten
tially need to change the | 102 // Any time a connection or disconnection happens on any of our inputs, we poten
tially need to change the |
103 // number of channels of our output. | 103 // number of channels of our output. |
104 void ChannelMergerNode::checkNumberOfChannelsForInput(AudioNodeInput* input) | 104 void ChannelMergerNode::checkNumberOfChannelsForInput(AudioNodeInput* input) |
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121 // channels because of tryLocks() in the context's updating system. So recor
d the new number of | 121 // channels because of tryLocks() in the context's updating system. So recor
d the new number of |
122 // output channels here. | 122 // output channels here. |
123 m_desiredNumberOfOutputChannels = numberOfOutputChannels; | 123 m_desiredNumberOfOutputChannels = numberOfOutputChannels; |
124 | 124 |
125 AudioNode::checkNumberOfChannelsForInput(input); | 125 AudioNode::checkNumberOfChannelsForInput(input); |
126 } | 126 } |
127 | 127 |
128 } // namespace WebCore | 128 } // namespace WebCore |
129 | 129 |
130 #endif // ENABLE(WEB_AUDIO) | 130 #endif // ENABLE(WEB_AUDIO) |
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