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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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78 uninitialize(); | 78 uninitialize(); |
79 } | 79 } |
80 | 80 |
81 void PannerNode::pullInputs(size_t framesToProcess) | 81 void PannerNode::pullInputs(size_t framesToProcess) |
82 { | 82 { |
83 // We override pullInputs(), so we can detect new AudioSourceNodes which hav
e connected to us when new connections are made. | 83 // We override pullInputs(), so we can detect new AudioSourceNodes which hav
e connected to us when new connections are made. |
84 // These AudioSourceNodes need to be made aware of our existence in order to
handle doppler shift pitch changes. | 84 // These AudioSourceNodes need to be made aware of our existence in order to
handle doppler shift pitch changes. |
85 if (m_connectionCount != context()->connectionCount()) { | 85 if (m_connectionCount != context()->connectionCount()) { |
86 m_connectionCount = context()->connectionCount(); | 86 m_connectionCount = context()->connectionCount(); |
87 | 87 |
88 // Recursively go through all nodes connected to us. | 88 // A map for keeping track if we have visited a node or not. This preven
ts feedback loops |
89 notifyAudioSourcesConnectedToNode(this); | 89 // from recursing infinitely. See crbug.com/331446. |
| 90 HashMap<AudioNode*, bool> visitedNodes; |
| 91 |
| 92 // Recursively go through all nodes connected to us |
| 93 notifyAudioSourcesConnectedToNode(this, visitedNodes); |
90 } | 94 } |
91 | 95 |
92 AudioNode::pullInputs(framesToProcess); | 96 AudioNode::pullInputs(framesToProcess); |
93 } | 97 } |
94 | 98 |
95 void PannerNode::process(size_t framesToProcess) | 99 void PannerNode::process(size_t framesToProcess) |
96 { | 100 { |
97 AudioBus* destination = output(0)->bus(); | 101 AudioBus* destination = output(0)->bus(); |
98 | 102 |
99 if (!isInitialized() || !input(0)->isConnected() || !m_panner.get()) { | 103 if (!isInitialized() || !input(0)->isConnected() || !m_panner.get()) { |
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379 m_distanceGain->setValue(static_cast<float>(distanceGain)); | 383 m_distanceGain->setValue(static_cast<float>(distanceGain)); |
380 | 384 |
381 // FIXME: could optimize by caching coneGain | 385 // FIXME: could optimize by caching coneGain |
382 double coneGain = m_coneEffect.gain(m_position, m_orientation, listenerPosit
ion); | 386 double coneGain = m_coneEffect.gain(m_position, m_orientation, listenerPosit
ion); |
383 | 387 |
384 m_coneGain->setValue(static_cast<float>(coneGain)); | 388 m_coneGain->setValue(static_cast<float>(coneGain)); |
385 | 389 |
386 return float(distanceGain * coneGain); | 390 return float(distanceGain * coneGain); |
387 } | 391 } |
388 | 392 |
389 void PannerNode::notifyAudioSourcesConnectedToNode(AudioNode* node) | 393 void PannerNode::notifyAudioSourcesConnectedToNode(AudioNode* node, HashMap<Audi
oNode*, bool>& visitedNodes) |
390 { | 394 { |
391 ASSERT(node); | 395 ASSERT(node); |
392 if (!node) | 396 if (!node) |
393 return; | 397 return; |
394 | 398 |
395 // First check if this node is an AudioBufferSourceNode. If so, let it know
about us so that doppler shift pitch can be taken into account. | 399 // First check if this node is an AudioBufferSourceNode. If so, let it know
about us so that doppler shift pitch can be taken into account. |
396 if (node->nodeType() == NodeTypeAudioBufferSource) { | 400 if (node->nodeType() == NodeTypeAudioBufferSource) { |
397 AudioBufferSourceNode* bufferSourceNode = static_cast<AudioBufferSourceN
ode*>(node); | 401 AudioBufferSourceNode* bufferSourceNode = static_cast<AudioBufferSourceN
ode*>(node); |
398 bufferSourceNode->setPannerNode(this); | 402 bufferSourceNode->setPannerNode(this); |
399 } else { | 403 } else { |
400 // Go through all inputs to this node. | 404 // Go through all inputs to this node. |
401 for (unsigned i = 0; i < node->numberOfInputs(); ++i) { | 405 for (unsigned i = 0; i < node->numberOfInputs(); ++i) { |
402 AudioNodeInput* input = node->input(i); | 406 AudioNodeInput* input = node->input(i); |
403 | 407 |
404 // For each input, go through all of its connections, looking for Au
dioBufferSourceNodes. | 408 // For each input, go through all of its connections, looking for Au
dioBufferSourceNodes. |
405 for (unsigned j = 0; j < input->numberOfRenderingConnections(); ++j)
{ | 409 for (unsigned j = 0; j < input->numberOfRenderingConnections(); ++j)
{ |
406 AudioNodeOutput* connectedOutput = input->renderingOutput(j); | 410 AudioNodeOutput* connectedOutput = input->renderingOutput(j); |
407 AudioNode* connectedNode = connectedOutput->node(); | 411 AudioNode* connectedNode = connectedOutput->node(); |
408 notifyAudioSourcesConnectedToNode(connectedNode); // recurse | 412 HashMap<AudioNode*, bool>::iterator iterator = visitedNodes.find
(connectedNode); |
| 413 |
| 414 // If we've seen this node already, we don't need to process it
again. Otherwise, |
| 415 // mark it as visited and recurse through the node looking for s
ources. |
| 416 if (iterator == visitedNodes.end()) { |
| 417 visitedNodes.set(connectedNode, true); |
| 418 notifyAudioSourcesConnectedToNode(connectedNode, visitedNode
s); // recurse |
| 419 } |
409 } | 420 } |
410 } | 421 } |
411 } | 422 } |
412 } | 423 } |
413 | 424 |
414 } // namespace WebCore | 425 } // namespace WebCore |
415 | 426 |
416 #endif // ENABLE(WEB_AUDIO) | 427 #endif // ENABLE(WEB_AUDIO) |
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