128 lines
4.1 KiB
C++
128 lines
4.1 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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#ifndef AudioDestinationNode_h_
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#define AudioDestinationNode_h_
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#include "AudioChannelService.h"
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#include "AudioNode.h"
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#include "AudioChannelAgent.h"
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#include "mozilla/TimeStamp.h"
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namespace mozilla::dom {
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class AudioContext;
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class WakeLock;
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class AudioDestinationNode final : public AudioNode,
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public nsIAudioChannelAgentCallback,
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public MainThreadMediaTrackListener {
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public:
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// This node type knows what MediaTrackGraph to use based on
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// whether it's in offline mode.
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AudioDestinationNode(AudioContext* aContext, bool aIsOffline,
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uint32_t aNumberOfChannels, uint32_t aLength);
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void DestroyMediaTrack() override;
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NS_DECL_ISUPPORTS_INHERITED
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NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(AudioDestinationNode, AudioNode)
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NS_DECL_NSIAUDIOCHANNELAGENTCALLBACK
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JSObject* WrapObject(JSContext* aCx,
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JS::Handle<JSObject*> aGivenProto) override;
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uint16_t NumberOfOutputs() const final { return 0; }
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uint32_t MaxChannelCount() const;
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void SetChannelCount(uint32_t aChannelCount, ErrorResult& aRv) override;
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void Init();
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void Close();
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// Returns the track or null after unlink.
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AudioNodeTrack* Track();
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void Mute();
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void Unmute();
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void Suspend();
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void Resume();
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void StartRendering(Promise* aPromise);
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void OfflineShutdown();
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void NotifyMainThreadTrackEnded() override;
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void FireOfflineCompletionEvent();
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const char* NodeType() const override { return "AudioDestinationNode"; }
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size_t SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const override;
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size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const override;
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void NotifyDataAudibleStateChanged(bool aAudible);
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void ResolvePromise(AudioBuffer* aRenderedBuffer);
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unsigned long Length() {
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MOZ_ASSERT(mIsOffline);
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return mFramesToProduce;
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}
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void NotifyAudioContextStateChanged();
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protected:
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virtual ~AudioDestinationNode();
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private:
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// This would be created for non-offline audio context in order to receive
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// tab's mute/suspend/audio capture state change and update the audible state
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// to the tab.
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void CreateAndStartAudioChannelAgent();
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void DestroyAudioChannelAgentIfExists();
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RefPtr<AudioChannelAgent> mAudioChannelAgent;
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// These members are related to audio capturing. We would start capturing
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// audio if we're starting capturing audio from whole window, and MUST stop
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// capturing explicitly when we don't need to capture audio any more, because
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// we have to release the resource we allocated before.
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bool IsCapturingAudio() const;
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void StartAudioCapturingTrack();
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void StopAudioCapturingTrack();
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RefPtr<MediaInputPort> mCaptureTrackPort;
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// These members are used to determine if the destination node is actual
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// audible and `mFinalAudibleState` represents the final result.
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using AudibleChangedReasons = AudioChannelService::AudibleChangedReasons;
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using AudibleState = AudioChannelService::AudibleState;
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void UpdateFinalAudibleStateIfNeeded(AudibleChangedReasons aReason);
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bool IsAudible() const;
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bool mFinalAudibleState = false;
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bool mIsDataAudible = false;
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float mAudioChannelVolume = 1.0;
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// True if the audio channel disables the track for unvisited tab, and the
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// track will be enabled again when the tab gets first visited, or a user
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// presses the tab play icon.
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bool mAudioChannelDisabled = false;
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// When the destination node is audible, we would request a wakelock to
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// prevent computer from sleeping in order to keep audio playing.
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void CreateAudioWakeLockIfNeeded();
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void ReleaseAudioWakeLockIfExists();
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RefPtr<WakeLock> mWakeLock;
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SelfReference<AudioDestinationNode> mOfflineRenderingRef;
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uint32_t mFramesToProduce;
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RefPtr<Promise> mOfflineRenderingPromise;
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bool mIsOffline;
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};
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} // namespace mozilla::dom
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#endif
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