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+/* -*- 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/. */
+
+#if !defined(MediaDecoder_h_)
+# define MediaDecoder_h_
+
+# include "BackgroundVideoDecodingPermissionObserver.h"
+# include "DecoderDoctorDiagnostics.h"
+# include "MediaContainerType.h"
+# include "MediaDecoderOwner.h"
+# include "MediaEventSource.h"
+# include "MediaMetadataManager.h"
+# include "MediaPromiseDefs.h"
+# include "MediaResource.h"
+# include "MediaStatistics.h"
+# include "SeekTarget.h"
+# include "TelemetryProbesReporter.h"
+# include "TimeUnits.h"
+# include "mozilla/Atomics.h"
+# include "mozilla/CDMProxy.h"
+# include "mozilla/MozPromise.h"
+# include "mozilla/ReentrantMonitor.h"
+# include "mozilla/StateMirroring.h"
+# include "mozilla/StateWatching.h"
+# include "mozilla/dom/MediaDebugInfoBinding.h"
+# include "nsCOMPtr.h"
+# include "nsIObserver.h"
+# include "nsISupports.h"
+# include "nsITimer.h"
+
+class AudioDeviceInfo;
+class nsIPrincipal;
+
+namespace mozilla {
+
+class AbstractThread;
+class DOMMediaStream;
+class DecoderBenchmark;
+class ProcessedMediaTrack;
+class FrameStatistics;
+class VideoFrameContainer;
+class MediaFormatReader;
+class MediaDecoderStateMachineBase;
+struct MediaPlaybackEvent;
+struct SharedDummyTrack;
+
+template <typename T>
+struct DurationToType {
+ double operator()(double aDouble);
+ double operator()(const media::TimeUnit& aTimeUnit);
+};
+
+template <>
+struct DurationToType<double> {
+ double operator()(double aDouble) { return aDouble; }
+ double operator()(const media::TimeUnit& aTimeUnit) {
+ if (aTimeUnit.IsValid()) {
+ if (aTimeUnit.IsPosInf()) {
+ return std::numeric_limits<double>::infinity();
+ }
+ if (aTimeUnit.IsNegInf()) {
+ return -std::numeric_limits<double>::infinity();
+ }
+ return aTimeUnit.ToSeconds();
+ }
+ return std::numeric_limits<double>::quiet_NaN();
+ }
+};
+
+using DurationToDouble = DurationToType<double>;
+
+template <>
+struct DurationToType<media::TimeUnit> {
+ media::TimeUnit operator()(double aDouble) {
+ return media::TimeUnit::FromSeconds(aDouble);
+ }
+ media::TimeUnit operator()(const media::TimeUnit& aTimeUnit) {
+ return aTimeUnit;
+ }
+};
+
+using DurationToTimeUnit = DurationToType<media::TimeUnit>;
+
+struct MOZ_STACK_CLASS MediaDecoderInit {
+ MediaDecoderOwner* const mOwner;
+ TelemetryProbesReporterOwner* const mReporterOwner;
+ const double mVolume;
+ const bool mPreservesPitch;
+ const double mPlaybackRate;
+ const bool mMinimizePreroll;
+ const bool mHasSuspendTaint;
+ const bool mLooping;
+ const MediaContainerType mContainerType;
+ const nsAutoString mStreamName;
+
+ MediaDecoderInit(MediaDecoderOwner* aOwner,
+ TelemetryProbesReporterOwner* aReporterOwner, double aVolume,
+ bool aPreservesPitch, double aPlaybackRate,
+ bool aMinimizePreroll, bool aHasSuspendTaint, bool aLooping,
+ const MediaContainerType& aContainerType)
+ : mOwner(aOwner),
+ mReporterOwner(aReporterOwner),
+ mVolume(aVolume),
+ mPreservesPitch(aPreservesPitch),
+ mPlaybackRate(aPlaybackRate),
+ mMinimizePreroll(aMinimizePreroll),
+ mHasSuspendTaint(aHasSuspendTaint),
+ mLooping(aLooping),
+ mContainerType(aContainerType) {}
+};
+
+DDLoggedTypeDeclName(MediaDecoder);
+
+class MediaDecoder : public DecoderDoctorLifeLogger<MediaDecoder> {
+ public:
+ typedef MozPromise<bool /* aIgnored */, bool /* aIgnored */,
+ /* IsExclusive = */ true>
+ SeekPromise;
+
+ NS_INLINE_DECL_THREADSAFE_REFCOUNTING(MediaDecoder)
+
+ // Enumeration for the valid play states (see mPlayState)
+ enum PlayState {
+ PLAY_STATE_LOADING,
+ PLAY_STATE_PAUSED,
+ PLAY_STATE_PLAYING,
+ PLAY_STATE_ENDED,
+ PLAY_STATE_SHUTDOWN
+ };
+
+ // Must be called exactly once, on the main thread, during startup.
+ static void InitStatics();
+
+ explicit MediaDecoder(MediaDecoderInit& aInit);
+
+ // Returns the container content type of the resource.
+ // Safe to call from any thread.
+ const MediaContainerType& ContainerType() const { return mContainerType; }
+
+ // Cleanup internal data structures. Must be called on the main
+ // thread by the owning object before that object disposes of this object.
+ virtual void Shutdown();
+
+ // Notified by the shutdown manager that XPCOM shutdown has begun.
+ // The decoder should notify its owner to drop the reference to the decoder
+ // to prevent further calls into the decoder.
+ void NotifyXPCOMShutdown();
+
+ // Called if the media file encounters a network error.
+ void NetworkError(const MediaResult& aError);
+
+ // Return the principal of the current URI being played or downloaded.
+ virtual already_AddRefed<nsIPrincipal> GetCurrentPrincipal() = 0;
+
+ // Return true if the loading of this resource required cross-origin
+ // redirects.
+ virtual bool HadCrossOriginRedirects() = 0;
+
+ // Return the time position in the video stream being
+ // played measured in seconds.
+ virtual double GetCurrentTime();
+
+ // Seek to the time position in (seconds) from the start of the video.
+ // If aDoFastSeek is true, we'll seek to the sync point/keyframe preceeding
+ // the seek target.
+ void Seek(double aTime, SeekTarget::Type aSeekType);
+
+ // Start playback of a video. 'Load' must have previously been
+ // called.
+ virtual void Play();
+
+ // Notify activity of the decoder owner is changed.
+ virtual void NotifyOwnerActivityChanged(bool aIsOwnerInvisible,
+ bool aIsOwnerConnected);
+
+ // Pause video playback.
+ virtual void Pause();
+ // Adjust the speed of the playback, optionally with pitch correction,
+ void SetVolume(double aVolume);
+
+ void SetPlaybackRate(double aPlaybackRate);
+ void SetPreservesPitch(bool aPreservesPitch);
+ void SetLooping(bool aLooping);
+ void SetStreamName(const nsAutoString& aStreamName);
+
+ // Set the given device as the output device.
+ RefPtr<GenericPromise> SetSink(AudioDeviceInfo* aSinkDevice);
+
+ bool GetMinimizePreroll() const { return mMinimizePreroll; }
+
+ // When we enable delay seek mode, media decoder won't actually ask MDSM to do
+ // seeking. During this period, we would store the latest seeking target and
+ // perform the seek to that target when we leave the mode. If we have any
+ // delayed seeks stored `IsSeeking()` will return true. E.g. During delay
+ // seeking mode, if we get seek target to 5s, 10s, 7s. When we stop delaying
+ // seeking, we would only seek to 7s.
+ void SetDelaySeekMode(bool aShouldDelaySeek);
+
+ // All MediaStream-related data is protected by mReentrantMonitor.
+ // We have at most one DecodedStreamData per MediaDecoder. Its stream
+ // is used as the input for each ProcessedMediaTrack created by calls to
+ // captureStream(UntilEnded). Seeking creates a new source stream, as does
+ // replaying after the input as ended. In the latter case, the new source is
+ // not connected to streams created by captureStreamUntilEnded.
+
+ enum class OutputCaptureState { Capture, Halt, None };
+ // Set the output capture state of this decoder.
+ // @param aState Capture: Output is captured into output tracks, and
+ // aDummyTrack must be provided.
+ // Halt: A capturing media sink is used, but capture is
+ // halted.
+ // None: Output is not captured.
+ // @param aDummyTrack A SharedDummyTrack the capturing media sink can use to
+ // access a MediaTrackGraph, so it can create tracks even
+ // when there are no output tracks available.
+ void SetOutputCaptureState(OutputCaptureState aState,
+ SharedDummyTrack* aDummyTrack = nullptr);
+ // Add an output track. All decoder output for the track's media type will be
+ // sent to the track.
+ // Note that only one audio track and one video track is supported by
+ // MediaDecoder at this time. Passing in more of one type, or passing in a
+ // type that metadata says we are not decoding, is an error.
+ void AddOutputTrack(RefPtr<ProcessedMediaTrack> aTrack);
+ // Remove an output track added with AddOutputTrack.
+ void RemoveOutputTrack(const RefPtr<ProcessedMediaTrack>& aTrack);
+ // Update the principal for any output tracks.
+ void SetOutputTracksPrincipal(const RefPtr<nsIPrincipal>& aPrincipal);
+
+ // Return the duration of the video in seconds.
+ virtual double GetDuration();
+
+ // Return true if the stream is infinite.
+ bool IsInfinite() const;
+
+ // Return true if we are currently seeking in the media resource.
+ // Call on the main thread only.
+ bool IsSeeking() const;
+
+ // Return true if the decoder has reached the end of playback.
+ bool IsEnded() const;
+
+ // True if we are playing a MediaSource object.
+ virtual bool IsMSE() const { return false; }
+
+ // Return true if the MediaDecoderOwner's error attribute is not null.
+ // Must be called before Shutdown().
+ bool OwnerHasError() const;
+
+ // Returns true if this media supports random seeking. False for example with
+ // chained ogg files.
+ bool IsMediaSeekable();
+ // Returns true if seeking is supported on a transport level (e.g. the server
+ // supports range requests, we are playing a file, etc.).
+ virtual bool IsTransportSeekable() = 0;
+
+ // Return the time ranges that can be seeked into, in TimeUnits.
+ virtual media::TimeIntervals GetSeekable();
+ // Return the time ranges that can be seeked into, in seconds, double
+ // precision.
+ virtual media::TimeRanges GetSeekableTimeRanges();
+
+ template <typename T>
+ T GetSeekableImpl();
+
+ // Set the end time of the media resource. When playback reaches
+ // this point the media pauses. aTime is in seconds.
+ virtual void SetFragmentEndTime(double aTime);
+
+ // Invalidate the frame.
+ void Invalidate();
+ void InvalidateWithFlags(uint32_t aFlags);
+
+ // Suspend any media downloads that are in progress. Called by the
+ // media element when it is sent to the bfcache, or when we need
+ // to throttle the download. Call on the main thread only. This can
+ // be called multiple times, there's an internal "suspend count".
+ // When it is called the internal system audio resource are cleaned up.
+ virtual void Suspend();
+
+ // Resume any media downloads that have been suspended. Called by the
+ // media element when it is restored from the bfcache, or when we need
+ // to stop throttling the download. Call on the main thread only.
+ // The download will only actually resume once as many Resume calls
+ // have been made as Suspend calls.
+ virtual void Resume();
+
+ // Moves any existing channel loads into or out of background. Background
+ // loads don't block the load event. This is called when we stop or restart
+ // delaying the load event. This also determines whether any new loads
+ // initiated (for example to seek) will be in the background. This calls
+ // SetLoadInBackground() on mResource.
+ virtual void SetLoadInBackground(bool aLoadInBackground) {}
+
+ MediaDecoderStateMachineBase* GetStateMachine() const;
+ void SetStateMachine(MediaDecoderStateMachineBase* aStateMachine);
+
+ // Constructs the time ranges representing what segments of the media
+ // are buffered and playable.
+ virtual media::TimeIntervals GetBuffered();
+
+ // Returns the size, in bytes, of the heap memory used by the currently
+ // queued decoded video and audio data.
+ size_t SizeOfVideoQueue();
+ size_t SizeOfAudioQueue();
+
+ // Helper struct for accumulating resource sizes that need to be measured
+ // asynchronously. Once all references are dropped the callback will be
+ // invoked.
+ struct ResourceSizes {
+ typedef MozPromise<size_t, size_t, true> SizeOfPromise;
+ NS_INLINE_DECL_THREADSAFE_REFCOUNTING(ResourceSizes)
+ explicit ResourceSizes(MallocSizeOf aMallocSizeOf)
+ : mMallocSizeOf(aMallocSizeOf), mByteSize(0), mCallback() {}
+
+ mozilla::MallocSizeOf mMallocSizeOf;
+ mozilla::Atomic<size_t> mByteSize;
+
+ RefPtr<SizeOfPromise> Promise() { return mCallback.Ensure(__func__); }
+
+ private:
+ ~ResourceSizes() { mCallback.ResolveIfExists(mByteSize, __func__); }
+
+ MozPromiseHolder<SizeOfPromise> mCallback;
+ };
+
+ virtual void AddSizeOfResources(ResourceSizes* aSizes) = 0;
+
+ VideoFrameContainer* GetVideoFrameContainer() { return mVideoFrameContainer; }
+
+ layers::ImageContainer* GetImageContainer();
+
+ // Returns true if we can play the entire media through without stopping
+ // to buffer, given the current download and playback rates.
+ bool CanPlayThrough();
+
+ // Called from HTMLMediaElement when owner document activity changes
+ virtual void SetElementVisibility(bool aIsOwnerInvisible,
+ bool aIsOwnerConnected);
+
+ // Force override the visible state to hidden.
+ // Called from HTMLMediaElement when testing of video decode suspend from
+ // mochitests.
+ void SetForcedHidden(bool aForcedHidden);
+
+ // Mark the decoder as tainted, meaning suspend-video-decoder is disabled.
+ void SetSuspendTaint(bool aTaint);
+
+ // Returns true if the decoder can't participate in suspend-video-decoder.
+ bool HasSuspendTaint() const;
+
+ void UpdateVideoDecodeMode();
+
+ void SetSecondaryVideoContainer(
+ const RefPtr<VideoFrameContainer>& aSecondaryVideoContainer);
+
+ void SetIsBackgroundVideoDecodingAllowed(bool aAllowed);
+
+ bool IsVideoDecodingSuspended() const;
+
+ // The MediaDecoderOwner of this decoder wants to resist fingerprinting.
+ bool ShouldResistFingerprinting() const {
+ return mShouldResistFingerprinting;
+ }
+
+ /******
+ * The following methods must only be called on the main
+ * thread.
+ ******/
+
+ // Change to a new play state. This updates the mState variable and
+ // notifies any thread blocking on this object's monitor of the
+ // change. Call on the main thread only.
+ virtual void ChangeState(PlayState aState);
+
+ // Called when the video has completed playing.
+ // Call on the main thread only.
+ void PlaybackEnded();
+
+ void OnSeekRejected();
+ void OnSeekResolved();
+
+ // Seeking has started. Inform the element on the main thread.
+ void SeekingStarted();
+
+ void UpdateLogicalPositionInternal();
+ void UpdateLogicalPosition() {
+ MOZ_ASSERT(NS_IsMainThread());
+ MOZ_DIAGNOSTIC_ASSERT(!IsShutdown());
+ // Per spec, offical position remains stable during pause and seek.
+ if (mPlayState == PLAY_STATE_PAUSED || IsSeeking()) {
+ return;
+ }
+ UpdateLogicalPositionInternal();
+ }
+
+ // Find the end of the cached data starting at the current decoder
+ // position.
+ int64_t GetDownloadPosition();
+
+ // Notifies the element that decoding has failed.
+ void DecodeError(const MediaResult& aError);
+
+ // Indicate whether the media is same-origin with the element.
+ void UpdateSameOriginStatus(bool aSameOrigin);
+
+ MediaDecoderOwner* GetOwner() const;
+
+ AbstractThread* AbstractMainThread() const { return mAbstractMainThread; }
+
+ RefPtr<SetCDMPromise> SetCDMProxy(CDMProxy* aProxy);
+
+ void EnsureTelemetryReported();
+
+ static bool IsOggEnabled();
+ static bool IsOpusEnabled();
+ static bool IsWaveEnabled();
+ static bool IsWebMEnabled();
+
+ // Return the frame decode/paint related statistics.
+ FrameStatistics& GetFrameStatistics() { return *mFrameStats; }
+
+ void UpdateReadyState() {
+ MOZ_ASSERT(NS_IsMainThread());
+ MOZ_DIAGNOSTIC_ASSERT(!IsShutdown());
+ GetOwner()->UpdateReadyState();
+ }
+
+ MediaDecoderOwner::NextFrameStatus NextFrameStatus() const {
+ return mNextFrameStatus;
+ }
+
+ virtual MediaDecoderOwner::NextFrameStatus NextFrameBufferedStatus();
+
+ RefPtr<GenericPromise> RequestDebugInfo(dom::MediaDecoderDebugInfo& aInfo);
+
+ void GetDebugInfo(dom::MediaDecoderDebugInfo& aInfo);
+
+ protected:
+ virtual ~MediaDecoder();
+
+ // Called when the first audio and/or video from the media file has been
+ // loaded by the state machine. Call on the main thread only.
+ virtual void FirstFrameLoaded(UniquePtr<MediaInfo> aInfo,
+ MediaDecoderEventVisibility aEventVisibility);
+
+ // Return error if fail to init the state machine.
+ nsresult CreateAndInitStateMachine(bool aIsLiveStream,
+ bool aDisableExternalEngine = false);
+
+ // Always return a state machine. If the decoder supports using external
+ // engine, `aDisableExternalEngine` can disable the external engine if needed.
+ virtual MediaDecoderStateMachineBase* CreateStateMachine(
+ bool aDisableExternalEngine) MOZ_NONNULL_RETURN = 0;
+
+ void SetStateMachineParameters();
+
+ // Disconnect any events before shutting down the state machine.
+ void DisconnectEvents();
+ RefPtr<ShutdownPromise> ShutdownStateMachine();
+
+ // Called when MediaDecoder shutdown is finished. Subclasses use this to clean
+ // up internal structures, and unregister potential shutdown blockers when
+ // they're done.
+ virtual void ShutdownInternal();
+
+ bool IsShutdown() const;
+
+ // Called to notify the decoder that the duration has changed.
+ virtual void DurationChanged();
+
+ // State-watching manager.
+ WatchManager<MediaDecoder> mWatchManager;
+
+ double ExplicitDuration() { return mExplicitDuration.ref(); }
+
+ void SetExplicitDuration(double aValue) {
+ MOZ_DIAGNOSTIC_ASSERT(!IsShutdown());
+ mExplicitDuration = Some(aValue);
+
+ // We Invoke DurationChanged explicitly, rather than using a watcher, so
+ // that it takes effect immediately, rather than at the end of the current
+ // task.
+ DurationChanged();
+ }
+
+ virtual void OnPlaybackEvent(MediaPlaybackEvent&& aEvent);
+
+ // Called when the metadata from the media file has been loaded by the
+ // state machine. Call on the main thread only.
+ virtual void MetadataLoaded(UniquePtr<MediaInfo> aInfo,
+ UniquePtr<MetadataTags> aTags,
+ MediaDecoderEventVisibility aEventVisibility);
+
+ void SetLogicalPosition(const media::TimeUnit& aNewPosition);
+
+ /******
+ * The following members should be accessed with the decoder lock held.
+ ******/
+
+ // The logical playback position of the media resource in units of
+ // seconds. This corresponds to the "official position" in HTML5. Note that
+ // we need to store this as a double, rather than an int64_t (like
+ // mCurrentPosition), so that |v.currentTime = foo; v.currentTime == foo|
+ // returns true without being affected by rounding errors.
+ double mLogicalPosition;
+
+ // The current playback position of the underlying playback infrastructure.
+ // This corresponds to the "current position" in HTML5.
+ // We allow omx subclasses to substitute an alternative current position for
+ // usage with the audio offload player.
+ virtual media::TimeUnit CurrentPosition() { return mCurrentPosition.Ref(); }
+
+ already_AddRefed<layers::KnowsCompositor> GetCompositor();
+
+ // Official duration of the media resource as observed by script.
+ // This can be a TimeUnit representing the exact duration found by demuxing,
+ // as a TimeUnit. This can also be a duration set explicitly by script, as a
+ // double.
+ Variant<media::TimeUnit, double> mDuration;
+
+ /******
+ * The following member variables can be accessed from any thread.
+ ******/
+
+ RefPtr<MediaFormatReader> mReader;
+
+ // Amount of buffered data ahead of current time required to consider that
+ // the next frame is available.
+ // An arbitrary value of 250ms is used.
+ static constexpr auto DEFAULT_NEXT_FRAME_AVAILABLE_BUFFERED =
+ media::TimeUnit::FromMicroseconds(250000);
+
+ private:
+ // Called when the owner's activity changed.
+ void NotifyCompositor();
+
+ void OnPlaybackErrorEvent(const MediaResult& aError);
+
+ void OnDecoderDoctorEvent(DecoderDoctorEvent aEvent);
+
+ void OnMediaNotSeekable() { mMediaSeekable = false; }
+
+ void OnNextFrameStatus(MediaDecoderOwner::NextFrameStatus);
+
+ void OnTrackInfoUpdated(const VideoInfo& aVideoInfo,
+ const AudioInfo& aAudioInfo);
+
+ void OnSecondaryVideoContainerInstalled(
+ const RefPtr<VideoFrameContainer>& aSecondaryVideoContainer);
+
+ void OnStoreDecoderBenchmark(const VideoInfo& aInfo);
+
+ void FinishShutdown();
+
+ void ConnectMirrors(MediaDecoderStateMachineBase* aObject);
+ void DisconnectMirrors();
+
+ virtual bool CanPlayThroughImpl() = 0;
+
+ // The state machine object for handling the decoding. It is safe to
+ // call methods of this object from other threads. Its internal data
+ // is synchronised on a monitor. The lifetime of this object is
+ // after mPlayState is LOADING and before mPlayState is SHUTDOWN. It
+ // is safe to access it during this period.
+ //
+ // Explicitly prievate to force access via accessors.
+ RefPtr<MediaDecoderStateMachineBase> mDecoderStateMachine;
+
+ protected:
+ void NotifyReaderDataArrived();
+ void DiscardOngoingSeekIfExists();
+ void CallSeek(const SeekTarget& aTarget);
+
+ // Called by MediaResource when the principal of the resource has
+ // changed. Called on main thread only.
+ virtual void NotifyPrincipalChanged();
+
+ MozPromiseRequestHolder<SeekPromise> mSeekRequest;
+
+ const char* PlayStateStr();
+
+ void OnMetadataUpdate(TimedMetadata&& aMetadata);
+
+ // This should only ever be accessed from the main thread.
+ // It is set in the constructor and cleared in Shutdown when the element goes
+ // away. The decoder does not add a reference the element.
+ MediaDecoderOwner* mOwner;
+
+ // The AbstractThread from mOwner.
+ const RefPtr<AbstractThread> mAbstractMainThread;
+
+ // Counters related to decode and presentation of frames.
+ const RefPtr<FrameStatistics> mFrameStats;
+
+ // Store a benchmark of the decoder based on FrameStatistics.
+ RefPtr<DecoderBenchmark> mDecoderBenchmark;
+
+ RefPtr<VideoFrameContainer> mVideoFrameContainer;
+
+ // True if the decoder has been directed to minimize its preroll before
+ // playback starts. After the first time playback starts, we don't attempt
+ // to minimize preroll, as we assume the user is likely to keep playing,
+ // or play the media again.
+ const bool mMinimizePreroll;
+
+ // True if we've already fired metadataloaded.
+ bool mFiredMetadataLoaded;
+
+ // True if the media is seekable (i.e. supports random access).
+ bool mMediaSeekable = true;
+
+ // True if the media is only seekable within its buffered ranges
+ // like WebMs with no cues.
+ bool mMediaSeekableOnlyInBufferedRanges = false;
+
+ // Stores media info, including info of audio tracks and video tracks, should
+ // only be accessed from main thread.
+ UniquePtr<MediaInfo> mInfo;
+
+ // True if the owner element is actually visible to users.
+ bool mIsOwnerInvisible;
+
+ // True if the owner element is connected to a document tree.
+ // https://dom.spec.whatwg.org/#connected
+ bool mIsOwnerConnected;
+
+ // If true, forces the decoder to be considered hidden.
+ bool mForcedHidden;
+
+ // True if the decoder has a suspend taint - meaning suspend-video-decoder is
+ // disabled.
+ bool mHasSuspendTaint;
+
+ // If true, the decoder should resist fingerprinting.
+ const bool mShouldResistFingerprinting;
+
+ MediaDecoderOwner::NextFrameStatus mNextFrameStatus =
+ MediaDecoderOwner::NEXT_FRAME_UNAVAILABLE;
+
+ // A listener to receive metadata updates from MDSM.
+ MediaEventListener mTimedMetadataListener;
+
+ MediaEventListener mMetadataLoadedListener;
+ MediaEventListener mFirstFrameLoadedListener;
+
+ MediaEventListener mOnPlaybackEvent;
+ MediaEventListener mOnPlaybackErrorEvent;
+ MediaEventListener mOnDecoderDoctorEvent;
+ MediaEventListener mOnMediaNotSeekable;
+ MediaEventListener mOnEncrypted;
+ MediaEventListener mOnWaitingForKey;
+ MediaEventListener mOnDecodeWarning;
+ MediaEventListener mOnNextFrameStatus;
+ MediaEventListener mOnTrackInfoUpdated;
+ MediaEventListener mOnSecondaryVideoContainerInstalled;
+ MediaEventListener mOnStoreDecoderBenchmark;
+
+ // True if we have suspended video decoding.
+ bool mIsVideoDecodingSuspended = false;
+
+ protected:
+ // PlaybackRate and pitch preservation status we should start at.
+ double mPlaybackRate;
+
+ // True if the decoder is seeking.
+ Watchable<bool> mLogicallySeeking;
+
+ // Buffered range, mirrored from the reader.
+ Mirror<media::TimeIntervals> mBuffered;
+
+ // NB: Don't use mCurrentPosition directly, but rather CurrentPosition().
+ Mirror<media::TimeUnit> mCurrentPosition;
+
+ // Duration of the media resource according to the state machine.
+ Mirror<media::NullableTimeUnit> mStateMachineDuration;
+
+ // Used to distinguish whether the audio is producing sound.
+ Mirror<bool> mIsAudioDataAudible;
+
+ // Volume of playback. 0.0 = muted. 1.0 = full volume.
+ Canonical<double> mVolume;
+
+ Canonical<bool> mPreservesPitch;
+
+ Canonical<bool> mLooping;
+
+ Canonical<nsAutoString> mStreamName;
+
+ // The device used with SetSink, or nullptr if no explicit device has been
+ // set.
+ Canonical<RefPtr<AudioDeviceInfo>> mSinkDevice;
+
+ // Set if the decoder is sending video to a secondary container. While set we
+ // should not suspend the decoder.
+ Canonical<RefPtr<VideoFrameContainer>> mSecondaryVideoContainer;
+
+ // Whether this MediaDecoder's output is captured, halted or not captured.
+ // When captured, all decoded data must be played out through mOutputTracks.
+ Canonical<OutputCaptureState> mOutputCaptureState;
+
+ // A dummy track used to access the right MediaTrackGraph instance. Needed
+ // since there's no guarantee that output tracks are present.
+ Canonical<nsMainThreadPtrHandle<SharedDummyTrack>> mOutputDummyTrack;
+
+ // Tracks that, if set, will get data routed through them.
+ Canonical<CopyableTArray<RefPtr<ProcessedMediaTrack>>> mOutputTracks;
+
+ // PrincipalHandle to be used when feeding data into mOutputTracks.
+ Canonical<PrincipalHandle> mOutputPrincipal;
+
+ // Media duration set explicitly by JS. At present, this is only ever present
+ // for MSE.
+ Maybe<double> mExplicitDuration;
+
+ // Set to one of the valid play states.
+ // This can only be changed on the main thread while holding the decoder
+ // monitor. Thus, it can be safely read while holding the decoder monitor
+ // OR on the main thread.
+ Canonical<PlayState> mPlayState;
+
+ // This can only be changed on the main thread.
+ PlayState mNextState = PLAY_STATE_PAUSED;
+
+ // True if the media is same-origin with the element. Data can only be
+ // passed to MediaStreams when this is true.
+ bool mSameOriginMedia;
+
+ // We can allow video decoding in background when we match some special
+ // conditions, eg. when the cursor is hovering over the tab. This observer is
+ // used to listen the related events.
+ RefPtr<BackgroundVideoDecodingPermissionObserver> mVideoDecodingOberver;
+
+ // True if we want to resume video decoding even the media element is in the
+ // background.
+ bool mIsBackgroundVideoDecodingAllowed;
+
+ // True if we want to delay seeking, and and save the latest seeking target to
+ // resume to when we stop delaying seeking.
+ bool mShouldDelaySeek = false;
+ Maybe<SeekTarget> mDelayedSeekTarget;
+
+ public:
+ Canonical<double>& CanonicalVolume() { return mVolume; }
+ Canonical<bool>& CanonicalPreservesPitch() { return mPreservesPitch; }
+ Canonical<bool>& CanonicalLooping() { return mLooping; }
+ Canonical<nsAutoString>& CanonicalStreamName() { return mStreamName; }
+ Canonical<RefPtr<AudioDeviceInfo>>& CanonicalSinkDevice() {
+ return mSinkDevice;
+ }
+ Canonical<RefPtr<VideoFrameContainer>>& CanonicalSecondaryVideoContainer() {
+ return mSecondaryVideoContainer;
+ }
+ Canonical<OutputCaptureState>& CanonicalOutputCaptureState() {
+ return mOutputCaptureState;
+ }
+ Canonical<nsMainThreadPtrHandle<SharedDummyTrack>>&
+ CanonicalOutputDummyTrack() {
+ return mOutputDummyTrack;
+ }
+ Canonical<CopyableTArray<RefPtr<ProcessedMediaTrack>>>&
+ CanonicalOutputTracks() {
+ return mOutputTracks;
+ }
+ Canonical<PrincipalHandle>& CanonicalOutputPrincipal() {
+ return mOutputPrincipal;
+ }
+ Canonical<PlayState>& CanonicalPlayState() { return mPlayState; }
+
+ void UpdateTelemetryHelperBasedOnPlayState(PlayState aState) const;
+
+ TelemetryProbesReporter::Visibility OwnerVisibility() const;
+
+ // Those methods exist to report telemetry related metrics.
+ double GetTotalVideoPlayTimeInSeconds() const;
+ double GetTotalVideoHDRPlayTimeInSeconds() const;
+ double GetVisibleVideoPlayTimeInSeconds() const;
+ double GetInvisibleVideoPlayTimeInSeconds() const;
+ double GetVideoDecodeSuspendedTimeInSeconds() const;
+ double GetTotalAudioPlayTimeInSeconds() const;
+ double GetAudiblePlayTimeInSeconds() const;
+ double GetInaudiblePlayTimeInSeconds() const;
+ double GetMutedPlayTimeInSeconds() const;
+
+ private:
+ /**
+ * This enum describes the reason why we need to update the logical position.
+ * ePeriodicUpdate : the position grows periodically during playback
+ * eSeamlessLoopingSeeking : the position changes due to demuxer level seek.
+ * eOther : due to normal seeking or other attributes changes, eg. playstate
+ */
+ enum class PositionUpdate {
+ ePeriodicUpdate,
+ eSeamlessLoopingSeeking,
+ eOther,
+ };
+ PositionUpdate GetPositionUpdateReason(double aPrevPos,
+ const media::TimeUnit& aCurPos) const;
+
+ // Notify owner when the audible state changed
+ void NotifyAudibleStateChanged();
+
+ void NotifyVolumeChanged();
+
+ bool mTelemetryReported;
+ const MediaContainerType mContainerType;
+ bool mCanPlayThrough = false;
+
+ UniquePtr<TelemetryProbesReporter> mTelemetryProbesReporter;
+
+# ifdef MOZ_WMF_MEDIA_ENGINE
+ // True when we need to update the newly created MDSM's status to make it
+ // consistent with the previous destroyed one.
+ bool mPendingStatusUpdateForNewlyCreatedStateMachine = false;
+# endif
+};
+
+} // namespace mozilla
+
+#endif