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-rw-r--r--dom/media/webaudio/ChannelSplitterNode.cpp81
1 files changed, 81 insertions, 0 deletions
diff --git a/dom/media/webaudio/ChannelSplitterNode.cpp b/dom/media/webaudio/ChannelSplitterNode.cpp
new file mode 100644
index 000000000..34a414d16
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+++ b/dom/media/webaudio/ChannelSplitterNode.cpp
@@ -0,0 +1,81 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/dom/ChannelSplitterNode.h"
+#include "mozilla/dom/ChannelSplitterNodeBinding.h"
+#include "AudioNodeEngine.h"
+#include "AudioNodeStream.h"
+
+namespace mozilla {
+namespace dom {
+
+NS_IMPL_ISUPPORTS_INHERITED0(ChannelSplitterNode, AudioNode)
+
+class ChannelSplitterNodeEngine final : public AudioNodeEngine
+{
+public:
+ explicit ChannelSplitterNodeEngine(ChannelSplitterNode* aNode)
+ : AudioNodeEngine(aNode)
+ {
+ MOZ_ASSERT(NS_IsMainThread());
+ }
+
+ void ProcessBlocksOnPorts(AudioNodeStream* aStream,
+ const OutputChunks& aInput,
+ OutputChunks& aOutput,
+ bool* aFinished) override
+ {
+ MOZ_ASSERT(aInput.Length() == 1, "Should only have one input port");
+
+ aOutput.SetLength(OutputCount());
+ for (uint16_t i = 0; i < OutputCount(); ++i) {
+ if (i < aInput[0].ChannelCount()) {
+ // Split out existing channels
+ aOutput[i].AllocateChannels(1);
+ AudioBlockCopyChannelWithScale(
+ static_cast<const float*>(aInput[0].mChannelData[i]),
+ aInput[0].mVolume,
+ aOutput[i].ChannelFloatsForWrite(0));
+ } else {
+ // Pad with silent channels if needed
+ aOutput[i].SetNull(WEBAUDIO_BLOCK_SIZE);
+ }
+ }
+ }
+
+ size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const override
+ {
+ return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
+ }
+};
+
+ChannelSplitterNode::ChannelSplitterNode(AudioContext* aContext,
+ uint16_t aOutputCount)
+ : AudioNode(aContext,
+ 2,
+ ChannelCountMode::Max,
+ ChannelInterpretation::Speakers)
+ , mOutputCount(aOutputCount)
+{
+ mStream = AudioNodeStream::Create(aContext,
+ new ChannelSplitterNodeEngine(this),
+ AudioNodeStream::NO_STREAM_FLAGS,
+ aContext->Graph());
+}
+
+ChannelSplitterNode::~ChannelSplitterNode()
+{
+}
+
+JSObject*
+ChannelSplitterNode::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
+{
+ return ChannelSplitterNodeBinding::Wrap(aCx, this, aGivenProto);
+}
+
+} // namespace dom
+} // namespace mozilla
+