зеркало из https://github.com/mozilla/gecko-dev.git
97 строки
3.1 KiB
C++
97 строки
3.1 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/dom/ChannelMergerNode.h"
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#include "mozilla/dom/ChannelMergerNodeBinding.h"
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#include "AudioNodeEngine.h"
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#include "AudioNodeTrack.h"
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namespace mozilla {
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namespace dom {
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class ChannelMergerNodeEngine final : public AudioNodeEngine {
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public:
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explicit ChannelMergerNodeEngine(ChannelMergerNode* aNode)
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: AudioNodeEngine(aNode) {
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MOZ_ASSERT(NS_IsMainThread());
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}
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void ProcessBlocksOnPorts(AudioNodeTrack* aTrack,
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Span<const AudioBlock> aInput,
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Span<AudioBlock> aOutput,
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bool* aFinished) override {
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MOZ_ASSERT(aInput.Length() == InputCount());
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MOZ_ASSERT(aOutput.Length() == 1, "Should have only one output port");
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// Get the number of output channels, and allocate it
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size_t channelCount = InputCount();
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bool allNull = true;
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for (size_t i = 0; i < channelCount; ++i) {
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allNull &= aInput[i].IsNull();
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}
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if (allNull) {
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aOutput[0].SetNull(WEBAUDIO_BLOCK_SIZE);
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return;
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}
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aOutput[0].AllocateChannels(channelCount);
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for (size_t i = 0; i < channelCount; ++i) {
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float* output = aOutput[0].ChannelFloatsForWrite(i);
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if (aInput[i].IsNull()) {
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PodZero(output, WEBAUDIO_BLOCK_SIZE);
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} else {
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AudioBlockCopyChannelWithScale(
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static_cast<const float*>(aInput[i].mChannelData[0]),
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aInput[i].mVolume, output);
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}
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}
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}
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size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const override {
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return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
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}
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};
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ChannelMergerNode::ChannelMergerNode(AudioContext* aContext,
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uint16_t aInputCount)
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: AudioNode(aContext, 1, ChannelCountMode::Explicit,
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ChannelInterpretation::Speakers),
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mInputCount(aInputCount) {
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mTrack =
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AudioNodeTrack::Create(aContext, new ChannelMergerNodeEngine(this),
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AudioNodeTrack::NO_TRACK_FLAGS, aContext->Graph());
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}
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/* static */
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already_AddRefed<ChannelMergerNode> ChannelMergerNode::Create(
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AudioContext& aAudioContext, const ChannelMergerOptions& aOptions,
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ErrorResult& aRv) {
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if (aOptions.mNumberOfInputs == 0 ||
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aOptions.mNumberOfInputs > WebAudioUtils::MaxChannelCount) {
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aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
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return nullptr;
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}
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RefPtr<ChannelMergerNode> audioNode =
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new ChannelMergerNode(&aAudioContext, aOptions.mNumberOfInputs);
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audioNode->Initialize(aOptions, aRv);
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if (NS_WARN_IF(aRv.Failed())) {
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return nullptr;
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}
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return audioNode.forget();
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}
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JSObject* ChannelMergerNode::WrapObject(JSContext* aCx,
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JS::Handle<JSObject*> aGivenProto) {
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return ChannelMergerNode_Binding::Wrap(aCx, this, aGivenProto);
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}
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} // namespace dom
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} // namespace mozilla
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