diff options
Diffstat (limited to 'dom/media/webaudio/ConstantSourceNode.cpp')
| -rw-r--r-- | dom/media/webaudio/ConstantSourceNode.cpp | 279 |
1 files changed, 279 insertions, 0 deletions
diff --git a/dom/media/webaudio/ConstantSourceNode.cpp b/dom/media/webaudio/ConstantSourceNode.cpp new file mode 100644 index 0000000000..01ee570722 --- /dev/null +++ b/dom/media/webaudio/ConstantSourceNode.cpp @@ -0,0 +1,279 @@ +/* -*- 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 "ConstantSourceNode.h" + +#include "AudioDestinationNode.h" +#include "nsContentUtils.h" +#include "AudioNodeEngine.h" +#include "AudioNodeTrack.h" +#include "Tracing.h" + +namespace mozilla::dom { + +NS_IMPL_CYCLE_COLLECTION_INHERITED(ConstantSourceNode, AudioScheduledSourceNode, + mOffset) + +NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ConstantSourceNode) +NS_INTERFACE_MAP_END_INHERITING(AudioScheduledSourceNode) + +NS_IMPL_ADDREF_INHERITED(ConstantSourceNode, AudioScheduledSourceNode) +NS_IMPL_RELEASE_INHERITED(ConstantSourceNode, AudioScheduledSourceNode) + +class ConstantSourceNodeEngine final : public AudioNodeEngine { + public: + ConstantSourceNodeEngine(AudioNode* aNode, AudioDestinationNode* aDestination) + : AudioNodeEngine(aNode), + mSource(nullptr), + mDestination(aDestination->Track()), + mStart(-1), + mStop(TRACK_TIME_MAX) + // Keep the default values in sync with + // ConstantSourceNode::ConstantSourceNode. + , + mOffset(1.0f) { + MOZ_ASSERT(NS_IsMainThread()); + } + + void SetSourceTrack(AudioNodeTrack* aSource) { mSource = aSource; } + + enum Parameters { + OFFSET, + START, + STOP, + }; + void RecvTimelineEvent(uint32_t aIndex, AudioTimelineEvent& aEvent) override { + MOZ_ASSERT(mDestination); + + WebAudioUtils::ConvertAudioTimelineEventToTicks(aEvent, mDestination); + + switch (aIndex) { + case OFFSET: + mOffset.InsertEvent<int64_t>(aEvent); + break; + default: + NS_ERROR("Bad ConstantSourceNodeEngine TimelineParameter"); + } + } + + void SetTrackTimeParameter(uint32_t aIndex, TrackTime aParam) override { + switch (aIndex) { + case START: + mStart = aParam; + mSource->SetActive(); + break; + case STOP: + mStop = aParam; + break; + default: + NS_ERROR("Bad ConstantSourceNodeEngine TrackTimeParameter"); + } + } + + void ProcessBlock(AudioNodeTrack* aTrack, GraphTime aFrom, + const AudioBlock& aInput, AudioBlock* aOutput, + bool* aFinished) override { + MOZ_ASSERT(mSource == aTrack, "Invalid source track"); + TRACE("ConstantSourceNodeEngine::ProcessBlock"); + + TrackTime ticks = mDestination->GraphTimeToTrackTime(aFrom); + if (mStart == -1) { + aOutput->SetNull(WEBAUDIO_BLOCK_SIZE); + return; + } + + if (ticks + WEBAUDIO_BLOCK_SIZE <= mStart || ticks >= mStop || + mStop <= mStart) { + aOutput->SetNull(WEBAUDIO_BLOCK_SIZE); + } else { + aOutput->AllocateChannels(1); + float* output = aOutput->ChannelFloatsForWrite(0); + uint32_t writeOffset = 0; + + if (ticks < mStart) { + MOZ_ASSERT(mStart - ticks <= WEBAUDIO_BLOCK_SIZE); + uint32_t count = mStart - ticks; + std::fill_n(output, count, 0.0f); + writeOffset += count; + } + + MOZ_ASSERT(ticks + writeOffset >= mStart); + MOZ_ASSERT(mStop - ticks >= writeOffset); + uint32_t count = + std::min<TrackTime>(WEBAUDIO_BLOCK_SIZE, mStop - ticks) - writeOffset; + + if (mOffset.HasSimpleValue()) { + float value = mOffset.GetValueAtTime(ticks); + std::fill_n(output + writeOffset, count, value); + } else { + mOffset.GetValuesAtTime(ticks + writeOffset, output + writeOffset, + count); + } + + writeOffset += count; + + std::fill_n(output + writeOffset, WEBAUDIO_BLOCK_SIZE - writeOffset, + 0.0f); + } + + if (ticks + WEBAUDIO_BLOCK_SIZE >= mStop) { + // We've finished playing. + *aFinished = true; + } + } + + bool IsActive() const override { + // start() has been called. + return mStart != -1; + } + + size_t SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const override { + size_t amount = AudioNodeEngine::SizeOfExcludingThis(aMallocSizeOf); + + // Not owned: + // - mSource + // - mDestination + // - mOffset (internal ref owned by node) + + return amount; + } + + size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const override { + return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf); + } + + // mSource deletes the engine in its destructor. + AudioNodeTrack* MOZ_NON_OWNING_REF mSource; + RefPtr<AudioNodeTrack> mDestination; + TrackTime mStart; + TrackTime mStop; + AudioParamTimeline mOffset; +}; + +ConstantSourceNode::ConstantSourceNode(AudioContext* aContext) + : AudioScheduledSourceNode(aContext, 2, ChannelCountMode::Max, + ChannelInterpretation::Speakers), + mStartCalled(false) { + mOffset = + CreateAudioParam(ConstantSourceNodeEngine::OFFSET, u"offset"_ns, 1.0f); + ConstantSourceNodeEngine* engine = + new ConstantSourceNodeEngine(this, aContext->Destination()); + mTrack = AudioNodeTrack::Create(aContext, engine, + AudioNodeTrack::NEED_MAIN_THREAD_ENDED, + aContext->Graph()); + engine->SetSourceTrack(mTrack); + mTrack->AddMainThreadListener(this); +} + +ConstantSourceNode::~ConstantSourceNode() = default; + +size_t ConstantSourceNode::SizeOfExcludingThis( + MallocSizeOf aMallocSizeOf) const { + size_t amount = AudioNode::SizeOfExcludingThis(aMallocSizeOf); + + amount += mOffset->SizeOfIncludingThis(aMallocSizeOf); + return amount; +} + +size_t ConstantSourceNode::SizeOfIncludingThis( + MallocSizeOf aMallocSizeOf) const { + return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf); +} + +JSObject* ConstantSourceNode::WrapObject(JSContext* aCx, + JS::Handle<JSObject*> aGivenProto) { + return ConstantSourceNode_Binding::Wrap(aCx, this, aGivenProto); +} + +already_AddRefed<ConstantSourceNode> ConstantSourceNode::Constructor( + const GlobalObject& aGlobal, AudioContext& aContext, + const ConstantSourceOptions& aOptions) { + RefPtr<ConstantSourceNode> object = new ConstantSourceNode(&aContext); + object->mOffset->SetInitialValue(aOptions.mOffset); + return object.forget(); +} + +void ConstantSourceNode::DestroyMediaTrack() { + if (mTrack) { + mTrack->RemoveMainThreadListener(this); + } + AudioNode::DestroyMediaTrack(); +} + +void ConstantSourceNode::Start(double aWhen, ErrorResult& aRv) { + if (!WebAudioUtils::IsTimeValid(aWhen)) { + aRv.ThrowRangeError<MSG_VALUE_OUT_OF_RANGE>("start time"); + return; + } + + if (mStartCalled) { + aRv.ThrowInvalidStateError("Can't call start() more than once"); + return; + } + mStartCalled = true; + + if (!mTrack) { + return; + } + + mTrack->SetTrackTimeParameter(ConstantSourceNodeEngine::START, Context(), + aWhen); + + MarkActive(); + Context()->StartBlockedAudioContextIfAllowed(); +} + +void ConstantSourceNode::Stop(double aWhen, ErrorResult& aRv) { + if (!WebAudioUtils::IsTimeValid(aWhen)) { + aRv.ThrowRangeError<MSG_VALUE_OUT_OF_RANGE>("stop time"); + return; + } + + if (!mStartCalled) { + aRv.ThrowInvalidStateError("Can't call stop() without calling start()"); + return; + } + + if (!mTrack || !Context()) { + return; + } + + mTrack->SetTrackTimeParameter(ConstantSourceNodeEngine::STOP, Context(), + std::max(0.0, aWhen)); +} + +void ConstantSourceNode::NotifyMainThreadTrackEnded() { + MOZ_ASSERT(mTrack->IsEnded()); + + class EndedEventDispatcher final : public Runnable { + public: + explicit EndedEventDispatcher(ConstantSourceNode* aNode) + : mozilla::Runnable("EndedEventDispatcher"), mNode(aNode) {} + NS_IMETHOD Run() override { + // If it's not safe to run scripts right now, schedule this to run later + if (!nsContentUtils::IsSafeToRunScript()) { + nsContentUtils::AddScriptRunner(this); + return NS_OK; + } + + mNode->DispatchTrustedEvent(u"ended"_ns); + // Release track resources. + mNode->DestroyMediaTrack(); + return NS_OK; + } + + private: + RefPtr<ConstantSourceNode> mNode; + }; + + Context()->Dispatch(do_AddRef(new EndedEventDispatcher(this))); + + // Drop the playing reference + // Warning: The below line might delete this. + MarkInactive(); +} + +} // namespace mozilla::dom |