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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 * 1. Redistributions of source code must retain the above copyright | 7 * 1. Redistributions of source code must retain the above copyright |
8 * notice, this list of conditions and the following disclaimer. | 8 * notice, this list of conditions and the following disclaimer. |
9 * 2. Redistributions in binary form must reproduce the above copyright | 9 * 2. Redistributions in binary form must reproduce the above copyright |
10 * notice, this list of conditions and the following disclaimer in the | 10 * notice, this list of conditions and the following disclaimer in the |
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43 return adoptRef(new AnalyserHandler(node, sampleRate)); | 43 return adoptRef(new AnalyserHandler(node, sampleRate)); |
44 } | 44 } |
45 | 45 |
46 AnalyserHandler::~AnalyserHandler() { | 46 AnalyserHandler::~AnalyserHandler() { |
47 uninitialize(); | 47 uninitialize(); |
48 } | 48 } |
49 | 49 |
50 void AnalyserHandler::process(size_t framesToProcess) { | 50 void AnalyserHandler::process(size_t framesToProcess) { |
51 AudioBus* outputBus = output(0).bus(); | 51 AudioBus* outputBus = output(0).bus(); |
52 | 52 |
53 if (!isInitialized() || !input(0).isConnected()) { | 53 if (!isInitialized()) { |
54 outputBus->zero(); | 54 outputBus->zero(); |
55 return; | 55 return; |
56 } | 56 } |
57 | 57 |
58 AudioBus* inputBus = input(0).bus(); | 58 AudioBus* inputBus = input(0).bus(); |
59 | 59 |
60 // Give the analyser the audio which is passing through this AudioNode. | 60 // Give the analyser the audio which is passing through this |
| 61 // AudioNode. This must always be done so that the state of the |
| 62 // Analyser reflects the current input. |
61 m_analyser.writeInput(inputBus, framesToProcess); | 63 m_analyser.writeInput(inputBus, framesToProcess); |
62 | 64 |
| 65 if (!input(0).isConnected()) { |
| 66 // No inputs, so clear the output, and propagate the silence hint. |
| 67 outputBus->zero(); |
| 68 return; |
| 69 } |
| 70 |
63 // For in-place processing, our override of pullInputs() will just pass the | 71 // For in-place processing, our override of pullInputs() will just pass the |
64 // audio data through unchanged if the channel count matches from input to | 72 // audio data through unchanged if the channel count matches from input to |
65 // output (resulting in inputBus == outputBus). Otherwise, do an up-mix to | 73 // output (resulting in inputBus == outputBus). Otherwise, do an up-mix to |
66 // stereo. | 74 // stereo. |
67 if (inputBus != outputBus) | 75 if (inputBus != outputBus) |
68 outputBus->copyFrom(*inputBus); | 76 outputBus->copyFrom(*inputBus); |
69 } | 77 } |
70 | 78 |
71 void AnalyserHandler::setFftSize(unsigned size, | 79 void AnalyserHandler::setFftSize(unsigned size, |
72 ExceptionState& exceptionState) { | 80 ExceptionState& exceptionState) { |
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125 m_analyser.setSmoothingTimeConstant(k); | 133 m_analyser.setSmoothingTimeConstant(k); |
126 } else { | 134 } else { |
127 exceptionState.throwDOMException( | 135 exceptionState.throwDOMException( |
128 IndexSizeError, | 136 IndexSizeError, |
129 ExceptionMessages::indexOutsideRange( | 137 ExceptionMessages::indexOutsideRange( |
130 "smoothing value", k, 0.0, ExceptionMessages::InclusiveBound, 1.0, | 138 "smoothing value", k, 0.0, ExceptionMessages::InclusiveBound, 1.0, |
131 ExceptionMessages::InclusiveBound)); | 139 ExceptionMessages::InclusiveBound)); |
132 } | 140 } |
133 } | 141 } |
134 | 142 |
| 143 void AnalyserHandler::updatePullStatus() { |
| 144 #if DCHECK_IS_ON() |
| 145 DCHECK(context()->isGraphOwner()); |
| 146 #endif |
| 147 |
| 148 if (output(0).isConnected()) { |
| 149 // When an AudioBasicInspectorNode is connected to a downstream node, it |
| 150 // will get pulled by the downstream node, thus remove it from the context's |
| 151 // automatic pull list. |
| 152 if (m_needAutomaticPull) { |
| 153 context()->deferredTaskHandler().removeAutomaticPullNode(this); |
| 154 m_needAutomaticPull = false; |
| 155 } |
| 156 } else { |
| 157 unsigned numberOfInputConnections = input(0).numberOfRenderingConnections(); |
| 158 // When an AnalyserNode is not connected to any downstream node |
| 159 // while still connected from upstream node(s), add it to the context's |
| 160 // automatic pull list. |
| 161 // |
| 162 // But don't remove the AnalyserNode if there are no inputs |
| 163 // connected to the node. The node needs to be pulled so that the |
| 164 // internal state is updated with the correct input signal (of |
| 165 // zeroes). |
| 166 if (numberOfInputConnections && !m_needAutomaticPull) { |
| 167 context()->deferredTaskHandler().addAutomaticPullNode(this); |
| 168 m_needAutomaticPull = true; |
| 169 } |
| 170 } |
| 171 } |
135 // ---------------------------------------------------------------- | 172 // ---------------------------------------------------------------- |
136 | 173 |
137 AnalyserNode::AnalyserNode(BaseAudioContext& context) | 174 AnalyserNode::AnalyserNode(BaseAudioContext& context) |
138 : AudioBasicInspectorNode(context) { | 175 : AudioBasicInspectorNode(context) { |
139 setHandler(AnalyserHandler::create(*this, context.sampleRate())); | 176 setHandler(AnalyserHandler::create(*this, context.sampleRate())); |
140 } | 177 } |
141 | 178 |
142 AnalyserNode* AnalyserNode::create(BaseAudioContext& context, | 179 AnalyserNode* AnalyserNode::create(BaseAudioContext& context, |
143 ExceptionState& exceptionState) { | 180 ExceptionState& exceptionState) { |
144 DCHECK(isMainThread()); | 181 DCHECK(isMainThread()); |
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235 | 272 |
236 void AnalyserNode::getFloatTimeDomainData(DOMFloat32Array* array) { | 273 void AnalyserNode::getFloatTimeDomainData(DOMFloat32Array* array) { |
237 analyserHandler().getFloatTimeDomainData(array); | 274 analyserHandler().getFloatTimeDomainData(array); |
238 } | 275 } |
239 | 276 |
240 void AnalyserNode::getByteTimeDomainData(DOMUint8Array* array) { | 277 void AnalyserNode::getByteTimeDomainData(DOMUint8Array* array) { |
241 analyserHandler().getByteTimeDomainData(array); | 278 analyserHandler().getByteTimeDomainData(array); |
242 } | 279 } |
243 | 280 |
244 } // namespace blink | 281 } // namespace blink |
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