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| -rw-r--r-- | dom/media/ExternalEngineStateMachine.h | 328 |
1 files changed, 328 insertions, 0 deletions
diff --git a/dom/media/ExternalEngineStateMachine.h b/dom/media/ExternalEngineStateMachine.h new file mode 100644 index 0000000000..31ea9e92cd --- /dev/null +++ b/dom/media/ExternalEngineStateMachine.h @@ -0,0 +1,328 @@ +/* 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/. */ + +#ifndef DOM_MEDIA_EXTERNALENGINESTATEMACHINE_H_ +#define DOM_MEDIA_EXTERNALENGINESTATEMACHINE_H_ + +#include "MediaDecoderStateMachineBase.h" +#include "SeekJob.h" +#include "mozilla/Variant.h" + +namespace mozilla { + +/** + * ExternalPlaybackEngine represents a media engine which is responsible for + * decoding and playback, which are not controlled by Gecko. + */ +class ExternalPlaybackEngine; + +enum class ExternalEngineEvent { + LoadedMetaData, + LoadedFirstFrame, + LoadedData, + Waiting, + Playing, + Seeked, + BufferingStarted, + BufferingEnded, + Timeupdate, + Ended, + RequestForAudio, + RequestForVideo, + AudioEnough, + VideoEnough, +}; +const char* ExternalEngineEventToStr(ExternalEngineEvent aEvent); + +/** + * When using ExternalEngineStateMachine, that means we use an external engine + * to control decoding and playback (including A/V sync). Eg. Media Foundation + * Media Engine on Windows. + * + * The external engine does most of playback works, and uses ExternalEngineEvent + * to tell us its internal state. Therefore, this state machine is responsible + * to address those events from the engine and coordinate the format reader in + * order to provide data to the engine correctly. + */ +DDLoggedTypeDeclName(ExternalEngineStateMachine); + +class ExternalEngineStateMachine final + : public MediaDecoderStateMachineBase, + public DecoderDoctorLifeLogger<ExternalEngineStateMachine> { + public: + NS_INLINE_DECL_THREADSAFE_REFCOUNTING(ExternalEngineStateMachine, override) + + ExternalEngineStateMachine(MediaDecoder* aDecoder, + MediaFormatReader* aReader); + + RefPtr<GenericPromise> InvokeSetSink( + const RefPtr<AudioDeviceInfo>& aSink) override; + + // The media sample would be managed by the external engine so we won't store + // any samples in our side. + size_t SizeOfVideoQueue() const override { return 0; } + size_t SizeOfAudioQueue() const override { return 0; } + + // Not supported. + void SetVideoDecodeMode(VideoDecodeMode aMode) override {} + void InvokeSuspendMediaSink() override {} + void InvokeResumeMediaSink() override {} + RefPtr<GenericPromise> RequestDebugInfo( + dom::MediaDecoderStateMachineDebugInfo& aInfo) override { + // This debug info doesn't fit in this scenario because most decoding + // details are only visible inside the external engine. + return GenericPromise::CreateAndResolve(true, __func__); + } + + void NotifyEvent(ExternalEngineEvent aEvent) { + // On the engine manager thread. + Unused << OwnerThread()->Dispatch(NS_NewRunnableFunction( + "ExternalEngineStateMachine::NotifyEvent", + [self = RefPtr{this}, aEvent] { self->NotifyEventInternal(aEvent); })); + } + void NotifyError(const MediaResult& aError) { + // On the engine manager thread. + Unused << OwnerThread()->Dispatch(NS_NewRunnableFunction( + "ExternalEngineStateMachine::NotifyError", + [self = RefPtr{this}, aError] { self->NotifyErrorInternal(aError); })); + } + + const char* GetStateStr() const; + + RefPtr<SetCDMPromise> SetCDMProxy(CDMProxy* aProxy) override; + + bool IsCDMProxySupported(CDMProxy* aProxy) override; + + private: + ~ExternalEngineStateMachine() = default; + + void AssertOnTaskQueue() const { MOZ_ASSERT(OnTaskQueue()); } + + // A light-weight state object that helps to store some variables which would + // only be used in a certain state. Also be able to do the cleaning for the + // state transition. Only modify on the task queue. + struct StateObject final { + enum class State { + InitEngine, + ReadingMetadata, + RunningEngine, + SeekingData, + ShutdownEngine, + RecoverEngine, + }; + struct InitEngine { + InitEngine() = default; + ~InitEngine() { mEngineInitRequest.DisconnectIfExists(); } + MozPromiseRequestHolder<GenericNonExclusivePromise> mEngineInitRequest; + RefPtr<GenericNonExclusivePromise> mInitPromise; + }; + struct ReadingMetadata { + ReadingMetadata() = default; + ~ReadingMetadata() { mMetadataRequest.DisconnectIfExists(); } + MozPromiseRequestHolder<MediaFormatReader::MetadataPromise> + mMetadataRequest; + }; + struct RunningEngine {}; + struct SeekingData { + SeekingData() = default; + SeekingData(SeekingData&&) = default; + SeekingData(const SeekingData&) = delete; + SeekingData& operator=(const SeekingData&) = delete; + ~SeekingData() { + mSeekJob.RejectIfExists(__func__); + mSeekRequest.DisconnectIfExists(); + } + void SetTarget(const SeekTarget& aTarget) { + // If there is any promise for previous seeking, reject it first. + mSeekJob.RejectIfExists(__func__); + mSeekRequest.DisconnectIfExists(); + // Then create a new seek job. + mSeekJob = SeekJob(); + mSeekJob.mTarget = Some(aTarget); + } + void Resolve(const char* aCallSite) { + MOZ_ASSERT(mSeekJob.Exists()); + mSeekJob.Resolve(aCallSite); + mSeekJob = SeekJob(); + } + void RejectIfExists(const char* aCallSite) { + mSeekJob.RejectIfExists(aCallSite); + } + bool IsSeeking() const { return mSeekRequest.Exists(); } + media::TimeUnit GetTargetTime() const { + return mSeekJob.mTarget ? mSeekJob.mTarget->GetTime() + : media::TimeUnit::Invalid(); + } + // Set it to true when starting seeking, and would be set to false after + // receiving engine's `seeked` event. Used on thhe task queue only. + bool mWaitingEngineSeeked = false; + bool mWaitingReaderSeeked = false; + MozPromiseRequestHolder<MediaFormatReader::SeekPromise> mSeekRequest; + SeekJob mSeekJob; + }; + struct ShutdownEngine { + RefPtr<ShutdownPromise> mShutdown; + }; + // This state is used to recover the media engine after the MF CDM process + // crashes. + struct RecoverEngine : public InitEngine {}; + + StateObject() : mData(InitEngine()), mName(State::InitEngine){}; + explicit StateObject(ReadingMetadata&& aArg) + : mData(std::move(aArg)), mName(State::ReadingMetadata){}; + explicit StateObject(RunningEngine&& aArg) + : mData(std::move(aArg)), mName(State::RunningEngine){}; + explicit StateObject(SeekingData&& aArg) + : mData(std::move(aArg)), mName(State::SeekingData){}; + explicit StateObject(ShutdownEngine&& aArg) + : mData(std::move(aArg)), mName(State::ShutdownEngine){}; + explicit StateObject(RecoverEngine&& aArg) + : mData(std::move(aArg)), mName(State::RecoverEngine){}; + + bool IsInitEngine() const { return mData.is<InitEngine>(); } + bool IsReadingMetadata() const { return mData.is<ReadingMetadata>(); } + bool IsRunningEngine() const { return mData.is<RunningEngine>(); } + bool IsSeekingData() const { return mData.is<SeekingData>(); } + bool IsShutdownEngine() const { return mData.is<ShutdownEngine>(); } + bool IsRecoverEngine() const { return mData.is<RecoverEngine>(); } + + InitEngine* AsInitEngine() { + if (IsInitEngine()) { + return &mData.as<InitEngine>(); + } + if (IsRecoverEngine()) { + return &mData.as<RecoverEngine>(); + } + return nullptr; + } + ReadingMetadata* AsReadingMetadata() { + return IsReadingMetadata() ? &mData.as<ReadingMetadata>() : nullptr; + } + SeekingData* AsSeekingData() { + return IsSeekingData() ? &mData.as<SeekingData>() : nullptr; + } + ShutdownEngine* AsShutdownEngine() { + return IsShutdownEngine() ? &mData.as<ShutdownEngine>() : nullptr; + } + + Variant<InitEngine, ReadingMetadata, RunningEngine, SeekingData, + ShutdownEngine, RecoverEngine> + mData; + State mName; + } mState; + using State = StateObject::State; + + void NotifyEventInternal(ExternalEngineEvent aEvent); + void NotifyErrorInternal(const MediaResult& aError); + + RefPtr<ShutdownPromise> Shutdown() override; + + void SetPlaybackRate(double aPlaybackRate) override; + void BufferedRangeUpdated() override; + void VolumeChanged() override; + void PreservesPitchChanged() override; + void PlayStateChanged() override; + void LoopingChanged() override; + + // Not supported. + void SetIsLiveStream(bool aIsLiveStream) override {} + void SetCanPlayThrough(bool aCanPlayThrough) override {} + void SetFragmentEndTime(const media::TimeUnit& aFragmentEndTime) override {} + + void InitEngine(); + void OnEngineInitSuccess(); + void OnEngineInitFailure(); + + void ReadMetadata(); + void OnMetadataRead(MetadataHolder&& aMetadata); + void OnMetadataNotRead(const MediaResult& aError); + bool IsFormatSupportedByExternalEngine(const MediaInfo& aInfo); + + // Functions for handling external engine event. + void OnLoadedFirstFrame(); + void OnLoadedData(); + void OnWaiting(); + void OnPlaying(); + void OnSeeked(); + void OnBufferingStarted(); + void OnBufferingEnded(); + void OnTimeupdate(); + void OnEnded(); + void OnRequestAudio(); + void OnRequestVideo(); + + void ResetDecode(); + + void EndOfStream(MediaData::Type aType); + void WaitForData(MediaData::Type aType); + + void StartRunningEngine(); + void RunningEngineUpdate(MediaData::Type aType); + + void ChangeStateTo(State aNextState); + static const char* StateToStr(State aState); + + RefPtr<MediaDecoder::SeekPromise> Seek(const SeekTarget& aTarget) override; + void SeekReader(); + void OnSeekResolved(const media::TimeUnit& aUnit); + void OnSeekRejected(const SeekRejectValue& aReject); + bool IsSeeking(); + void CheckIfSeekCompleted(); + + void MaybeFinishWaitForData(); + + void SetBlankVideoToVideoContainer(); + + media::TimeUnit GetVideoThreshold(); + + bool ShouldRunEngineUpdateForRequest(); + + void UpdateSecondaryVideoContainer() override; + + void RecoverFromCDMProcessCrashIfNeeded(); + + UniquePtr<ExternalPlaybackEngine> mEngine; + + bool mHasEnoughAudio = false; + bool mHasEnoughVideo = false; + bool mSentPlaybackEndedEvent = false; + bool mHasReceivedFirstDecodedVideoFrame = false; + + // Only used if setting CDM happens before the engine finishes initialization. + MozPromiseHolder<SetCDMPromise> mSetCDMProxyPromise; + MozPromiseRequestHolder<SetCDMPromise> mSetCDMProxyRequest; +}; + +class ExternalPlaybackEngine { + public: + explicit ExternalPlaybackEngine(ExternalEngineStateMachine* aOwner) + : mOwner(aOwner) {} + + virtual ~ExternalPlaybackEngine() = default; + + // Init the engine and specify the preload request. + virtual RefPtr<GenericNonExclusivePromise> Init(bool aShouldPreload) = 0; + virtual void Shutdown() = 0; + virtual uint64_t Id() const = 0; + + // Following methods should only be called after successfully initialize the + // external engine. + virtual void Play() = 0; + virtual void Pause() = 0; + virtual void Seek(const media::TimeUnit& aTargetTime) = 0; + virtual void SetPlaybackRate(double aPlaybackRate) = 0; + virtual void SetVolume(double aVolume) = 0; + virtual void SetLooping(bool aLooping) = 0; + virtual void SetPreservesPitch(bool aPreservesPitch) = 0; + virtual media::TimeUnit GetCurrentPosition() = 0; + virtual void NotifyEndOfStream(TrackInfo::TrackType aType) = 0; + virtual void SetMediaInfo(const MediaInfo& aInfo) = 0; + virtual bool SetCDMProxy(CDMProxy* aProxy) = 0; + + ExternalEngineStateMachine* const MOZ_NON_OWNING_REF mOwner; +}; + +} // namespace mozilla + +#endif // DOM_MEDIA_EXTERNALENGINESTATEMACHINE_H_ |