Media element resource selection algorithm should "await a stable state"

third_party/WebKit/Source/core/html/HTMLMediaElement.h

 /*
  * Copyright (C) 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 262 matching lines @@
     void attach(const AttachContext& = AttachContext()) override;
 
     void didMoveToNewDocument(Document& oldDocument) override;
     virtual KURL posterImageURL() const { return KURL(); }
 
     enum DisplayMode { Unknown, Poster, Video };
     DisplayMode getDisplayMode() const { return m_displayMode; }
     virtual void setDisplayMode(DisplayMode mode) { m_displayMode = mode; }
 
 private:
+    class Task;
+
     void resetMediaPlayerAndMediaSource();
 
     bool alwaysCreateUserAgentShadowRoot() const final { return true; }
     bool areAuthorShadowsAllowed() const final { return false; }
 
     bool supportsFocus() const final;
     bool isMouseFocusable() const final;
     bool layoutObjectIsNeeded(const ComputedStyle&) override;
     LayoutObject* createLayoutObject(const ComputedStyle&) override;
     InsertionNotificationRequest insertedInto(ContainerNode*) final;
@@ skipping 31 matching lines @@
     WebMediaPlayer::TrackId addVideoTrack(const WebString&, WebMediaPlayerClient::VideoTrackKind, const WebString&, const WebString&, bool) final;
     void removeVideoTrack(WebMediaPlayer::TrackId) final;
     void addTextTrack(WebInbandTextTrack*) final;
     void removeTextTrack(WebInbandTextTrack*) final;
     void mediaSourceOpened(WebMediaSource*) final;
     void requestSeek(double) final;
     void remoteRouteAvailabilityChanged(bool) final;
     void connectedToRemoteDevice() final;
     void disconnectedFromRemoteDevice() final;
 
-    void loadTimerFired(Timer<HTMLMediaElement>*);
+    void textTrackLoadTimerFired(Timer<HTMLMediaElement>*);
     void progressEventTimerFired(Timer<HTMLMediaElement>*);
     void playbackProgressTimerFired(Timer<HTMLMediaElement>*);
     void startPlaybackProgressTimer();
     void startProgressEventTimer();
     void stopPeriodicTimers();
 
     void seek(double time);
     void finishSeek();
     void checkIfSeekNeeded();
     void addPlayedRange(double start, double end);
 
     void scheduleEvent(const AtomicString& eventName); // FIXME: Rename to scheduleNamedEvent for clarity.
 
     // loading
     void invokeLoadAlgorithm();
     void invokeResourceSelectionAlgorithm();
+    void continueResourceSelectionAlgorithm();
+    void enqueueMicrotask();
     void loadInternal();
     void selectMediaResource();
     void loadResource(const KURL&, ContentType&);
     void startPlayerLoad();
     void setPlayerPreload();
     WebMediaPlayer::LoadType loadType() const;
-    void scheduleNextSourceChild();
     void loadNextSourceChild();
     void clearMediaPlayer();
     void clearMediaPlayerAndAudioSourceProviderClientWithoutLocking();
     bool havePotentialSourceChild();
     void noneSupported();
     void mediaEngineError(MediaError*);
     void cancelPendingEventsAndCallbacks();
     void waitForSourceChange();
     void setIgnorePreloadNone();
 
@@ skipping 90 matching lines @@
     void scheduleResolvePlayPromises();
     void scheduleRejectPlayPromises(ExceptionCode);
     void scheduleNotifyPlaying();
 
     void resolvePlayPromises();
     // TODO(mlamouri): this is used for cancellable tasks because we can't pass
     // parameters.
     void rejectPlayPromises();
     void rejectPlayPromises(ExceptionCode, const String&);
 
-    UnthrottledTimer<HTMLMediaElement> m_loadTimer;
+    UnthrottledTimer<HTMLMediaElement> m_textTrackLoadTimer;
     UnthrottledTimer<HTMLMediaElement> m_progressEventTimer;
     UnthrottledTimer<HTMLMediaElement> m_playbackProgressTimer;
     UnthrottledTimer<HTMLMediaElement> m_audioTracksTimer;
     PersistentWillBeMember<TimeRanges> m_playedTimeRanges;
     OwnPtrWillBeMember<GenericEventQueue> m_asyncEventQueue;
 
     double m_playbackRate;
     double m_defaultPlaybackRate;
     NetworkState m_networkState;
     ReadyState m_readyState;
@@ skipping 47 matching lines @@
     DisplayMode m_displayMode;
 
     RefPtrWillBeMember<HTMLMediaSource> m_mediaSource;
 
     // Cached time value. Only valid when ready state is HAVE_METADATA or
     // higher, otherwise the current time is assumed to be zero.
     mutable double m_cachedTime;
 
     double m_fragmentEndTime;
 
-    typedef unsigned PendingActionFlags;
-    PendingActionFlags m_pendingActionFlags;
-
     // FIXME: HTMLMediaElement has way too many state bits.
     bool m_userGestureRequiredForPlay : 1;
     bool m_playing : 1;
     bool m_shouldDelayLoadEvent : 1;
     bool m_haveFiredLoadedData : 1;
     bool m_autoplaying : 1;
     bool m_muted : 1;
     bool m_paused : 1;
     bool m_seeking : 1;
 
@@ skipping 26 matching lines @@
     PersistentHeapVectorWillBeHeapVector<Member<ScriptPromiseResolver>> m_playResolvers;
     OwnPtr<CancellableTaskFactory> m_playPromiseResolveTask;
     OwnPtr<CancellableTaskFactory> m_playPromiseRejectTask;
     ExceptionCode m_playPromiseErrorCode;
 
     // This is a weak reference, since m_audioSourceNode holds a reference to us.
     // FIXME: Oilpan: Consider making this a strongly traced pointer with oilpan where strong cycles are not a problem.
     GC_PLUGIN_IGNORE("http://crbug.com/404577")
     RawPtrWillBeWeakMember<AudioSourceProviderClient> m_audioSourceNode;
 
+    WeakPtr<Task> m_pendingTask; // owned by Microtask
+
     // AudioClientImpl wraps an AudioSourceProviderClient.
     // When the audio format is known, Chromium calls setFormat().
     class AudioClientImpl final : public GarbageCollectedFinalized<AudioClientImpl>, public WebAudioSourceProviderClient {
     public:
         explicit AudioClientImpl(AudioSourceProviderClient* client)
             : m_client(client)
         {
         }
 
         ~AudioClientImpl() override { }
@@ skipping 49 matching lines @@
 inline bool isHTMLMediaElement(const HTMLElement& element)
 {
     return isHTMLAudioElement(element) || isHTMLVideoElement(element);
 }
 
 DEFINE_HTMLELEMENT_TYPE_CASTS_WITH_FUNCTION(HTMLMediaElement);
 
 } // namespace blink
 
 #endif // HTMLMediaElement_h