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29 #include "modules/webaudio/ChannelSplitterNode.h"
31 #include "modules/webaudio/AudioContext.h"
32 #include "modules/webaudio/AudioNodeInput.h"
33 #include "modules/webaudio/AudioNodeOutput.h"
37 ChannelSplitterNode* ChannelSplitterNode::create(AudioContext* context, float sampleRate, unsigned numberOfOutputs)
39 if (!numberOfOutputs || numberOfOutputs > AudioContext::maxNumberOfChannels())
42 return adoptRefCountedGarbageCollectedWillBeNoop(new ChannelSplitterNode(context, sampleRate, numberOfOutputs));
45 ChannelSplitterNode::ChannelSplitterNode(AudioContext* context, float sampleRate, unsigned numberOfOutputs)
46 : AudioNode(context, sampleRate)
50 // Create a fixed number of outputs (able to handle the maximum number of channels fed to an input).
51 for (unsigned i = 0; i < numberOfOutputs; ++i)
52 addOutput(AudioNodeOutput::create(this, 1));
54 setNodeType(NodeTypeChannelSplitter);
58 void ChannelSplitterNode::process(size_t framesToProcess)
60 AudioBus* source = input(0)->bus();
62 ASSERT_UNUSED(framesToProcess, framesToProcess == source->length());
64 unsigned numberOfSourceChannels = source->numberOfChannels();
66 for (unsigned i = 0; i < numberOfOutputs(); ++i) {
67 AudioBus* destination = output(i)->bus();
70 if (i < numberOfSourceChannels) {
71 // Split the channel out if it exists in the source.
72 // It would be nice to avoid the copy and simply pass along pointers, but this becomes extremely difficult with fanout and fanin.
73 destination->channel(0)->copyFrom(source->channel(i));
74 } else if (output(i)->renderingFanOutCount() > 0) {
75 // Only bother zeroing out the destination if it's connected to anything
83 #endif // ENABLE(WEB_AUDIO)