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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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28 | 28 |
29 #include "modules/webaudio/AudioDestinationNode.h" | 29 #include "modules/webaudio/AudioDestinationNode.h" |
30 | 30 |
31 #include "core/platform/audio/AudioUtilities.h" | 31 #include "core/platform/audio/AudioUtilities.h" |
32 #include "core/platform/audio/DenormalDisabler.h" | 32 #include "core/platform/audio/DenormalDisabler.h" |
33 #include "modules/webaudio/AudioContext.h" | 33 #include "modules/webaudio/AudioContext.h" |
34 #include "modules/webaudio/AudioNodeInput.h" | 34 #include "modules/webaudio/AudioNodeInput.h" |
35 #include "modules/webaudio/AudioNodeOutput.h" | 35 #include "modules/webaudio/AudioNodeOutput.h" |
36 | 36 |
37 namespace WebCore { | 37 namespace WebCore { |
38 | 38 |
39 AudioDestinationNode::AudioDestinationNode(AudioContext* context, float sampleRa
te) | 39 AudioDestinationNode::AudioDestinationNode(AudioContext* context, float sampleRa
te) |
40 : AudioNode(context, sampleRate) | 40 : AudioNode(context, sampleRate) |
41 , m_currentSampleFrame(0) | 41 , m_currentSampleFrame(0) |
42 { | 42 { |
43 ScriptWrappable::init(this); | 43 ScriptWrappable::init(this); |
44 addInput(adoptPtr(new AudioNodeInput(this))); | 44 addInput(adoptPtr(new AudioNodeInput(this))); |
45 | 45 |
46 setNodeType(NodeTypeDestination); | 46 setNodeType(NodeTypeDestination); |
47 } | 47 } |
48 | 48 |
49 AudioDestinationNode::~AudioDestinationNode() | 49 AudioDestinationNode::~AudioDestinationNode() |
50 { | 50 { |
51 uninitialize(); | 51 uninitialize(); |
52 } | 52 } |
53 | 53 |
54 void AudioDestinationNode::render(AudioBus* sourceBus, AudioBus* destinationBus,
size_t numberOfFrames) | 54 void AudioDestinationNode::render(AudioBus* sourceBus, AudioBus* destinationBus,
size_t numberOfFrames) |
55 { | 55 { |
56 // We don't want denormals slowing down any of the audio processing | 56 // We don't want denormals slowing down any of the audio processing |
57 // since they can very seriously hurt performance. | 57 // since they can very seriously hurt performance. |
58 // This will take care of all AudioNodes because they all process within thi
s scope. | 58 // This will take care of all AudioNodes because they all process within thi
s scope. |
59 DenormalDisabler denormalDisabler; | 59 DenormalDisabler denormalDisabler; |
60 | 60 |
61 context()->setAudioThread(currentThread()); | 61 context()->setAudioThread(currentThread()); |
62 | 62 |
63 if (!context()->isRunnable()) { | 63 if (!context()->isRunnable()) { |
64 destinationBus->zero(); | 64 destinationBus->zero(); |
65 return; | 65 return; |
66 } | 66 } |
67 | 67 |
68 // Let the context take care of any business at the start of each render qua
ntum. | 68 // Let the context take care of any business at the start of each render qua
ntum. |
69 context()->handlePreRenderTasks(); | 69 context()->handlePreRenderTasks(); |
70 | 70 |
71 // Prepare the local audio input provider for this render quantum. | 71 // Prepare the local audio input provider for this render quantum. |
72 if (sourceBus) | 72 if (sourceBus) |
73 m_localAudioInputProvider.set(sourceBus); | 73 m_localAudioInputProvider.set(sourceBus); |
74 | 74 |
75 // This will cause the node(s) connected to us to process, which in turn wil
l pull on their input(s), | 75 // This will cause the node(s) connected to us to process, which in turn wil
l pull on their input(s), |
76 // all the way backwards through the rendering graph. | 76 // all the way backwards through the rendering graph. |
77 AudioBus* renderedBus = input(0)->pull(destinationBus, numberOfFrames); | 77 AudioBus* renderedBus = input(0)->pull(destinationBus, numberOfFrames); |
78 | 78 |
79 if (!renderedBus) | 79 if (!renderedBus) |
80 destinationBus->zero(); | 80 destinationBus->zero(); |
81 else if (renderedBus != destinationBus) { | 81 else if (renderedBus != destinationBus) { |
82 // in-place processing was not possible - so copy | 82 // in-place processing was not possible - so copy |
83 destinationBus->copyFrom(*renderedBus); | 83 destinationBus->copyFrom(*renderedBus); |
84 } | 84 } |
85 | 85 |
86 // Process nodes which need a little extra help because they are not connect
ed to anything, but still need to process. | 86 // Process nodes which need a little extra help because they are not connect
ed to anything, but still need to process. |
87 context()->processAutomaticPullNodes(numberOfFrames); | 87 context()->processAutomaticPullNodes(numberOfFrames); |
88 | 88 |
89 // Let the context take care of any business at the end of each render quant
um. | 89 // Let the context take care of any business at the end of each render quant
um. |
90 context()->handlePostRenderTasks(); | 90 context()->handlePostRenderTasks(); |
91 | 91 |
92 // Advance current sample-frame. | 92 // Advance current sample-frame. |
93 m_currentSampleFrame += numberOfFrames; | 93 m_currentSampleFrame += numberOfFrames; |
94 } | 94 } |
95 | 95 |
96 } // namespace WebCore | 96 } // namespace WebCore |
97 | 97 |
98 #endif // ENABLE(WEB_AUDIO) | 98 #endif // ENABLE(WEB_AUDIO) |
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