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29 #include "modules/webaudio/AudioDestinationNode.h"
31 #include "platform/audio/AudioUtilities.h"
32 #include "platform/audio/DenormalDisabler.h"
33 #include "modules/webaudio/AudioContext.h"
34 #include "modules/webaudio/AudioNodeInput.h"
35 #include "modules/webaudio/AudioNodeOutput.h"
39 AudioDestinationNode::AudioDestinationNode(AudioContext* context, float sampleRate)
40 : AudioNode(context, sampleRate)
41 , m_currentSampleFrame(0)
43 ScriptWrappable::init(this);
46 setNodeType(NodeTypeDestination);
49 AudioDestinationNode::~AudioDestinationNode()
51 ASSERT(!isInitialized());
54 void AudioDestinationNode::dispose()
60 void AudioDestinationNode::render(AudioBus* sourceBus, AudioBus* destinationBus, size_t numberOfFrames)
62 // We don't want denormals slowing down any of the audio processing
63 // since they can very seriously hurt performance.
64 // This will take care of all AudioNodes because they all process within this scope.
65 DenormalDisabler denormalDisabler;
67 context()->setAudioThread(currentThread());
69 if (!context()->isInitialized()) {
70 destinationBus->zero();
74 // Let the context take care of any business at the start of each render quantum.
75 context()->handlePreRenderTasks();
77 // Prepare the local audio input provider for this render quantum.
79 m_localAudioInputProvider.set(sourceBus);
81 // This will cause the node(s) connected to us to process, which in turn will pull on their input(s),
82 // all the way backwards through the rendering graph.
83 AudioBus* renderedBus = input(0)->pull(destinationBus, numberOfFrames);
86 destinationBus->zero();
87 else if (renderedBus != destinationBus) {
88 // in-place processing was not possible - so copy
89 destinationBus->copyFrom(*renderedBus);
92 // Process nodes which need a little extra help because they are not connected to anything, but still need to process.
93 context()->processAutomaticPullNodes(numberOfFrames);
95 // Let the context take care of any business at the end of each render quantum.
96 context()->handlePostRenderTasks();
98 // Advance current sample-frame.
99 m_currentSampleFrame += numberOfFrames;
104 #endif // ENABLE(WEB_AUDIO)