Refactor resource load and resource selection algorithms as per spec

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

 /*
  * 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 233 matching lines @@
     // when used with parameters, e.g. "application/octet-stream;codecs=theora", is a type that the user agent knows
     // it cannot render.
     if (contentMIMEType != "application/octet-stream" || contentTypeCodecs.isEmpty()) {
         WebMimeRegistry::SupportsType supported = Platform::current()->mimeRegistry()->supportsMediaMIMEType(contentMIMEType, contentTypeCodecs);
         return supported > WebMimeRegistry::IsNotSupported;
     }
 
     return false;
 }
 
+String preloadTypeToString(WebMediaPlayer::Preload preloadType)
+{
+    switch (preloadType) {
+    case WebMediaPlayer::PreloadNone:
+        return "none";
+    case WebMediaPlayer::PreloadMetaData:
+        return "metadata";
+    case WebMediaPlayer::PreloadAuto:
+        return "auto";
+    }
+
+    ASSERT_NOT_REACHED();
+    return String();
+}
+
 } // anonymous namespace
 
 void HTMLMediaElement::recordAutoplayMetric(AutoplayMetrics metric)
 {
     DEFINE_STATIC_LOCAL(EnumerationHistogram, autoplayHistogram, ("Blink.MediaElement.Autoplay", NumberOfAutoplayMetrics));
     autoplayHistogram.count(metric);
 }
 
 WebMimeRegistry::SupportsType HTMLMediaElement::supportsType(const ContentType& contentType)
 {
@@ skipping 61 matching lines @@
     , m_playing(false)
     , m_shouldDelayLoadEvent(false)
     , m_haveFiredLoadedData(false)
     , m_autoplaying(true)
     , m_muted(false)
     , m_paused(true)
     , m_seeking(false)
     , m_sentStalledEvent(false)
     , m_sentEndEvent(false)
     , m_closedCaptionsVisible(false)
-    , m_havePreparedToPlay(false)
+    , m_ignorePreloadNone(false)
     , m_tracksAreReady(true)
     , m_processingPreferenceChange(false)
     , m_remoteRoutesAvailable(false)
     , m_playingRemotely(false)
     , m_isFinalizing(false)
     , m_initialPlayWithoutUserGesture(false)
     , m_autoplayMediaCounted(false)
     , m_inOverlayFullscreenVideo(false)
     , m_audioTracks(AudioTrackList::create(*this))
     , m_videoTracks(VideoTrackList::create(*this))
@@ skipping 118 matching lines @@
 
     removeElementFromDocumentMap(this, &oldDocument);
     addElementToDocumentMap(this, &document());
 
     // FIXME: This is a temporary fix to prevent this object from causing the
     // MediaPlayer to dereference LocalFrame and FrameLoader pointers from the
     // previous document. This restarts the load, as if the src attribute had been set.
     // A proper fix would provide a mechanism to allow this object to refresh
     // the MediaPlayer's LocalFrame and FrameLoader references on
     // document changes so that playback can be resumed properly.
-    clearMediaPlayer(LoadMediaResource);
-    scheduleDelayedAction(LoadMediaResource);
+    m_ignorePreloadNone = false;
+    invokeLoadAlgorithm();
 
     // Decrement the load event delay count on oldDocument now that m_webMediaPlayer has been destroyed
     // and there is no risk of dispatching a load event from within the destructor.
     oldDocument.decrementLoadEventDelayCount();
 
     ActiveDOMObject::didMoveToNewExecutionContext(&document());
     HTMLElement::didMoveToNewDocument(oldDocument);
 }
 
 bool HTMLMediaElement::supportsFocus() const
 {
     if (ownerDocument()->isMediaDocument())
         return false;
 
     // If no controls specified, we should still be able to focus the element if it has tabIndex.
     return shouldShowControls() || HTMLElement::supportsFocus();
 }
 
 bool HTMLMediaElement::isMouseFocusable() const
 {
     return false;
 }
 
 void HTMLMediaElement::parseAttribute(const QualifiedName& name, const AtomicString& oldValue, const AtomicString& value)
 {
     if (name == srcAttr) {
         // Trigger a reload, as long as the 'src' attribute is present.
         if (!value.isNull()) {
-            clearMediaPlayer(LoadMediaResource);
-            scheduleDelayedAction(LoadMediaResource);
+            m_ignorePreloadNone = false;
+            invokeLoadAlgorithm();
         }
     } else if (name == controlsAttr) {
         UseCounter::count(document(), UseCounter::HTMLMediaElementControlsAttribute);
         configureMediaControls();
     } else if (name == preloadAttr) {
         setPlayerPreload();
     } else if (name == disableremoteplaybackAttr) {
         UseCounter::count(document(), UseCounter::DisableRemotePlaybackAttribute);
     } else {
         HTMLElement::parseAttribute(name, oldValue, value);
     }
 }
 
 void HTMLMediaElement::finishParsingChildren()
 {
     HTMLElement::finishParsingChildren();
 
     if (Traversal<HTMLTrackElement>::firstChild(*this))
-        scheduleDelayedAction(LoadTextTrackResource);
+        scheduleTextTrackResourceLoad();
 }
 
 bool HTMLMediaElement::layoutObjectIsNeeded(const ComputedStyle& style)
 {
     return shouldShowControls() && HTMLElement::layoutObjectIsNeeded(style);
 }
 
 LayoutObject* HTMLMediaElement::createLayoutObject(const ComputedStyle&)
 {
     return new LayoutMedia(this);
 }
 
 Node::InsertionNotificationRequest HTMLMediaElement::insertedInto(ContainerNode* insertionPoint)
 {
     WTF_LOG(Media, "HTMLMediaElement::insertedInto(%p, %p)", this, insertionPoint);
 
     HTMLElement::insertedInto(insertionPoint);
     if (insertionPoint->inDocument()) {
         UseCounter::count(document(), UseCounter::HTMLMediaElementInDocument);
-        if (!getAttribute(srcAttr).isEmpty() && m_networkState == NETWORK_EMPTY)
-            scheduleDelayedAction(LoadMediaResource);
+        if (!getAttribute(srcAttr).isEmpty() && m_networkState == NETWORK_EMPTY) {
+            m_ignorePreloadNone = false;
+            invokeLoadAlgorithm();
+        }
     }
 
     return InsertionShouldCallDidNotifySubtreeInsertions;
 }
 
 void HTMLMediaElement::didNotifySubtreeInsertionsToDocument()
 {
     configureMediaControls();
 }
 
@@ skipping 16 matching lines @@
     if (layoutObject())
         layoutObject()->updateFromElement();
 }
 
 void HTMLMediaElement::didRecalcStyle(StyleRecalcChange)
 {
     if (layoutObject())
         layoutObject()->updateFromElement();
 }
 
-void HTMLMediaElement::scheduleDelayedAction(DelayedActionType actionType)
+void HTMLMediaElement::scheduleTextTrackResourceLoad()
 {
-    WTF_LOG(Media, "HTMLMediaElement::scheduleDelayedAction(%p)", this);
+    WTF_LOG(Media, "HTMLMediaElement::scheduleTextTrackResourceLoad(%p)", this);
 
-    if ((actionType & LoadMediaResource) && !(m_pendingActionFlags & LoadMediaResource)) {
-        prepareForLoad();
-        m_pendingActionFlags |= LoadMediaResource;
-    }
-
-    if (actionType & LoadTextTrackResource)
-        m_pendingActionFlags |= LoadTextTrackResource;
+    m_pendingActionFlags |= LoadTextTrackResource;
 
     if (!m_loadTimer.isActive())
         m_loadTimer.startOneShot(0, BLINK_FROM_HERE);
 }
 
 void HTMLMediaElement::scheduleNextSourceChild()
 {
-    // Schedule the timer to try the next <source> element WITHOUT resetting state ala prepareForLoad.
+    // Schedule the timer to try the next <source> element WITHOUT resetting state ala invokeLoadAlgorithm.
     m_pendingActionFlags |= LoadMediaResource;
     m_loadTimer.startOneShot(0, BLINK_FROM_HERE);
 }
 
 void HTMLMediaElement::scheduleEvent(const AtomicString& eventName)
 {
     scheduleEvent(Event::createCancelable(eventName));
 }
 
 void HTMLMediaElement::scheduleEvent(PassRefPtrWillBeRawPtr<Event> event)
@@ skipping 92 matching lines @@
 
     if (UserGestureIndicator::processingUserGesture() && m_userGestureRequiredForPlay) {
         recordAutoplayMetric(AutoplayEnabledThroughLoad);
         m_userGestureRequiredForPlay = false;
         // While usergesture-initiated load()s technically count as autoplayed,
         // they don't feel like such to the users and hence we don't want to
         // count them for the purposes of metrics.
         m_autoplayMediaCounted = true;
     }
 
-    prepareForLoad();
-    loadInternal();
-    prepareToPlay();
+    m_ignorePreloadNone = true;
+    invokeLoadAlgorithm();
 }
 
-void HTMLMediaElement::prepareForLoad()
+// TODO(srirama.m): Currently m_ignorePreloadNone is reset before calling
+// invokeLoadAlgorithm() in all places except load(). Move it inside here
+// once microtask is implemented for "Await a stable state" step
+// in resource selection algorithm.
+void HTMLMediaElement::invokeLoadAlgorithm()
 {
-    WTF_LOG(Media, "HTMLMediaElement::prepareForLoad(%p)", this);
+    WTF_LOG(Media, "HTMLMediaElement::invokeLoadAlgorithm(%p)", this);
 
     // Perform the cleanup required for the resource load algorithm to run.
     stopPeriodicTimers();
     m_loadTimer.stop();
     cancelDeferredLoad();
     // FIXME: Figure out appropriate place to reset LoadTextTrackResource if necessary and set m_pendingActionFlags to 0 here.
     m_pendingActionFlags &= ~LoadMediaResource;
     m_sentEndEvent = false;
     m_sentStalledEvent = false;
     m_haveFiredLoadedData = false;
-    m_havePreparedToPlay = false;
     m_displayMode = Unknown;
 
     // 1 - Abort any already-running instance of the resource selection algorithm for this element.
     m_loadState = WaitingForSource;
     m_currentSourceNode = nullptr;
 
     // 2 - If there are any tasks from the media element's media element event task source in
     // one of the task queues, then remove those tasks.
     cancelPendingEventsAndCallbacks();
 
@@ skipping 43 matching lines @@
     }
 
     // 5 - Set the playbackRate attribute to the value of the defaultPlaybackRate attribute.
     setPlaybackRate(defaultPlaybackRate());
 
     // 6 - Set the error attribute to null and the autoplaying flag to true.
     m_error = nullptr;
     m_autoplaying = true;
 
     // 7 - Invoke the media element's resource selection algorithm.
+    invokeResourceSelectionAlgorithm();
 
     // 8 - Note: Playback of any previously playing media resource for this element stops.
+}
 
+void HTMLMediaElement::invokeResourceSelectionAlgorithm()
+{
+    WTF_LOG(Media, "HTMLMediaElement::invokeResourceSelectionAlgorithm(%p)", this);
     // The resource selection algorithm
     // 1 - Set the networkState to NETWORK_NO_SOURCE
     setNetworkState(NETWORK_NO_SOURCE);
 
-    // 2 - Asynchronously await a stable state.
+    // 2 - Set the element's show poster flag to true
+    // TODO(srirama.m): Introduce show poster flag and update it as per spec
 
     m_playedTimeRanges = TimeRanges::create();
 
     // FIXME: Investigate whether these can be moved into m_networkState != NETWORK_EMPTY block above
     // so they are closer to the relevant spec steps.
     m_lastSeekTime = 0;
     m_duration = std::numeric_limits<double>::quiet_NaN();
 
-    // The spec doesn't say to block the load event until we actually run the asynchronous section
-    // algorithm, but do it now because we won't start that until after the timer fires and the
-    // event may have already fired by then.
+    // 3 - Set the media element's delaying-the-load-event flag to true (this delays the load event)
     setShouldDelayLoadEvent(true);
     if (mediaControls())
         mediaControls()->reset();
+
+    // 4 - Await a stable state, allowing the task that invoked this algorithm to continue
+    // TODO(srirama.m): Remove scheduleNextSourceChild() and post a microtask instead.
+    // See http://crbug.com/593289 for more details.
+    scheduleNextSourceChild();
 }
 
 void HTMLMediaElement::loadInternal()
 {
     // HTMLMediaElement::textTracksAreReady will need "... the text tracks whose mode was not in the
     // disabled state when the element's resource selection algorithm last started".
     m_textTracksWhenResourceSelectionBegan.clear();
     if (m_textTracks) {
         for (unsigned i = 0; i < m_textTracks->length(); ++i) {
             TextTrack* track = m_textTracks->anonymousIndexedGetter(i);
@@ skipping 142 matching lines @@
                     m_mediaSource = nullptr;
                     attemptLoad = false;
                 }
             }
         }
     }
 
     if (attemptLoad && canLoadURL(url, contentType)) {
         ASSERT(!webMediaPlayer());
 
-        if (!m_havePreparedToPlay && effectivePreloadType() == WebMediaPlayer::PreloadNone) {
+        if (effectivePreloadType() == WebMediaPlayer::PreloadNone) {
             WTF_LOG(Media, "HTMLMediaElement::loadResource(%p) : Delaying load because preload == 'none'", this);
             deferLoad();
         } else {
             startPlayerLoad();
         }
     } else {
         mediaLoadingFailed(WebMediaPlayer::NetworkStateFormatError);
     }
 
     // If there is no poster to display, allow the media engine to render video frames as soon as
@@ skipping 57 matching lines @@
         // This handles any transition to or from fullscreen overlay mode.
         frame->chromeClient().enterFullScreenForElement(this);
     }
 }
 
 void HTMLMediaElement::setPlayerPreload()
 {
     if (m_webMediaPlayer)
         m_webMediaPlayer->setPreload(effectivePreloadType());
 
-    if (loadIsDeferred() && preloadType() != WebMediaPlayer::PreloadNone)
+    if (loadIsDeferred() && effectivePreloadType() != WebMediaPlayer::PreloadNone)
         startDeferredLoad();
 }
 
 bool HTMLMediaElement::loadIsDeferred() const
 {
     return m_deferredLoadState != NotDeferred;
 }
 
 void HTMLMediaElement::deferLoad()
 {
@@ skipping 532 matching lines @@
     if (!m_playedTimeRanges)
         m_playedTimeRanges = TimeRanges::create();
     m_playedTimeRanges->add(start, end);
 }
 
 bool HTMLMediaElement::supportsSave() const
 {
     return webMediaPlayer() && webMediaPlayer()->supportsSave();
 }
 
-void HTMLMediaElement::prepareToPlay()
+void HTMLMediaElement::setIgnorePreloadNone()
 {
-    WTF_LOG(Media, "HTMLMediaElement::prepareToPlay(%p)", this);
-    if (m_havePreparedToPlay)
-        return;
-    m_havePreparedToPlay = true;
-
-    if (loadIsDeferred())
-        startDeferredLoad();
+    WTF_LOG(Media, "HTMLMediaElement::setIgnorePreloadNone(%p)", this);
+    m_ignorePreloadNone = true;
+    setPlayerPreload();
 }
 
 void HTMLMediaElement::seek(double time)
 {
     WTF_LOG(Media, "HTMLMediaElement::seek(%p, %f)", this, time);
 
     // 2 - If the media element's readyState is HAVE_NOTHING, abort these steps.
     if (m_readyState == HAVE_NOTHING)
         return;
 
-    // If the media engine has been told to postpone loading data, let it go ahead now.
-    if (preloadType() < WebMediaPlayer::PreloadAuto && m_readyState < HAVE_FUTURE_DATA)
-        prepareToPlay();
+    // Ignore preload none and start load if necessary.
+    setIgnorePreloadNone();
 
     // Get the current time before setting m_seeking, m_lastSeekTime is returned once it is set.
     refreshCachedTime();
     // This is needed to avoid getting default playback start position from currentTime().
     double now = m_cachedTime;
 
     // 3 - If the element's seeking IDL attribute is true, then another instance of this algorithm is
     // already running. Abort that other instance of the algorithm without waiting for the step that
     // it is running to complete.
     // Nothing specific to be done here.
@@ skipping 239 matching lines @@
         }
 
         return true;
     }
 
     return false;
 }
 
 String HTMLMediaElement::preload() const
 {
-    switch (preloadType()) {
-    case WebMediaPlayer::PreloadNone:
-        return "none";
-    case WebMediaPlayer::PreloadMetaData:
-        return "metadata";
-    case WebMediaPlayer::PreloadAuto:
-        return "auto";
-    }
-
-    ASSERT_NOT_REACHED();
-    return String();
+    return preloadTypeToString(preloadType());
 }
 
 void HTMLMediaElement::setPreload(const AtomicString& preload)
 {
     WTF_LOG(Media, "HTMLMediaElement::setPreload(%p, %s)", this, preload.utf8().data());
     setAttribute(preloadAttr, preload);
 }
 
 WebMediaPlayer::Preload HTMLMediaElement::preloadType() const
 {
@@ skipping 23 matching lines @@
 
     // The spec does not define an invalid value default:
     // https://www.w3.org/Bugs/Public/show_bug.cgi?id=28950
 
     // TODO(philipj): Try to make "metadata" the default preload state:
     // https://crbug.com/310450
     UseCounter::count(document(), UseCounter::HTMLMediaElementPreloadDefault);
     return WebMediaPlayer::PreloadAuto;
 }
 
+String HTMLMediaElement::effectivePreload() const
+{
+    return preloadTypeToString(effectivePreloadType());
+}
+
 WebMediaPlayer::Preload HTMLMediaElement::effectivePreloadType() const
 {
-    return autoplay() ? WebMediaPlayer::PreloadAuto : preloadType();
+    if (autoplay())
+        return WebMediaPlayer::PreloadAuto;
+
+    WebMediaPlayer::Preload preload = preloadType();
+    if (m_ignorePreloadNone && preload == WebMediaPlayer::PreloadNone)
+        return WebMediaPlayer::PreloadMetaData;
+
+    return preload;
 }
 
 ScriptPromise HTMLMediaElement::playForBindings(ScriptState* scriptState)
 {
     Nullable<ExceptionCode> code = play();
     if (!code.isNull()) {
         String message;
         switch (code.get()) {
         case NotAllowedError:
             message = "play() can only be initiated by a user gesture.";
@@ skipping 51 matching lines @@
     WTF_LOG(Media, "HTMLMediaElement::playInternal(%p)", this);
 
     // Always return the buffering strategy to normal when not paused,
     // regardless of the cause. (In contrast with aggressive buffering which is
     // only enabled by pause(), not pauseInternal().)
     if (webMediaPlayer())
         webMediaPlayer()->setBufferingStrategy(WebMediaPlayer::BufferingStrategy::Normal);
 
     // 4.8.10.9. Playing the media resource
     if (m_networkState == NETWORK_EMPTY)
-        scheduleDelayedAction(LoadMediaResource);
+        invokeResourceSelectionAlgorithm();
 
     // Generally "ended" and "looping" are exclusive. Here, the loop attribute
     // is ignored to seek back to start in case loop was set after playback
     // ended. See http://crbug.com/364442
     if (endedPlayback(LoopCondition::Ignored))
         seek(0);
 
     if (m_paused) {
         m_paused = false;
         invalidateCachedTime();
         scheduleEvent(EventTypeNames::play);
 
         if (m_readyState <= HAVE_CURRENT_DATA)
             scheduleEvent(EventTypeNames::waiting);
         else if (m_readyState >= HAVE_FUTURE_DATA)
             scheduleNotifyPlaying();
     } else if (m_readyState >= HAVE_FUTURE_DATA) {
         scheduleResolvePlayPromises();
     }
 
     m_autoplaying = false;
 
+    setIgnorePreloadNone();
     updatePlayState();
 }
 
 void HTMLMediaElement::autoplayMediaEncountered()
 {
     if (!m_autoplayMediaCounted) {
         m_autoplayMediaCounted = true;
         recordAutoplayMetric(AutoplayMediaFound);
 
         if (!m_userGestureRequiredForPlay)
@@ skipping 20 matching lines @@
         webMediaPlayer()->setBufferingStrategy(WebMediaPlayer::BufferingStrategy::Aggressive);
 
     pauseInternal();
 }
 
 void HTMLMediaElement::pauseInternal()
 {
     WTF_LOG(Media, "HTMLMediaElement::pauseInternal(%p)", this);
 
     if (m_networkState == NETWORK_EMPTY)
-        scheduleDelayedAction(LoadMediaResource);
+        invokeResourceSelectionAlgorithm();
 
     m_autoplayHelper.pauseMethodCalled();
 
     m_autoplaying = false;
 
     if (!m_paused) {
         recordMetricsIfPausing();
 
         m_paused = true;
         scheduleTimeupdateEvent(false);
@@ skipping 315 matching lines @@
     // 5. Populate the new text track's list of cues with the cues parsed so far, folllowing the guidelines for exposing
     // cues, and begin updating it dynamically as necessary.
     //   - Thess are all done by the media engine.
 
     // 6. Set the new text track's readiness state to loaded.
     textTrack->setReadinessState(TextTrack::Loaded);
 
     // 7. Set the new text track's mode to the mode consistent with the user's preferences and the requirements of
     // the relevant specification for the data.
     //  - This will happen in honorUserPreferencesForAutomaticTextTrackSelection()
-    scheduleDelayedAction(LoadTextTrackResource);
+    scheduleTextTrackResourceLoad();
 
     // 8. Add the new text track to the media element's list of text tracks.
     // 9. Fire an event with the name addtrack, that does not bubble and is not cancelable, and that uses the TrackEvent
     // interface, with the track attribute initialized to the text track's TextTrack object, at the media element's
     // textTracks attribute's TextTrackList object.
     addTextTrack(textTrack);
 }
 
 void HTMLMediaElement::removeTextTrack(WebInbandTextTrack* webTrack)
 {
@@ skipping 99 matching lines @@
     // media element's list of text tracks ... [continues in TextTrackList::append]
     TextTrack* textTrack = trackElement->track();
     if (!textTrack)
         return;
 
     addTextTrack(textTrack);
 
     // Do not schedule the track loading until parsing finishes so we don't start before all tracks
     // in the markup have been added.
     if (isFinishedParsingChildren())
-        scheduleDelayedAction(LoadTextTrackResource);
+        scheduleTextTrackResourceLoad();
 }
 
 void HTMLMediaElement::didRemoveTrackElement(HTMLTrackElement* trackElement)
 {
 #if !LOG_DISABLED
     KURL url = trackElement->getNonEmptyURLAttribute(srcAttr);
     WTF_LOG(Media, "HTMLMediaElement::didRemoveTrackElement(%p) - 'src' is %s", this, urlForLoggingMedia(url).utf8().data());
 #endif
 
     TextTrack* textTrack = trackElement->track();
@@ skipping 164 matching lines @@
 #endif
 
     // We should only consider a <source> element when there is not src attribute at all.
     if (fastHasAttribute(srcAttr))
         return;
 
     // 4.8.8 - If a source element is inserted as a child of a media element that has no src
     // attribute and whose networkState has the value NETWORK_EMPTY, the user agent must invoke
     // the media element's resource selection algorithm.
     if (getNetworkState() == HTMLMediaElement::NETWORK_EMPTY) {
-        scheduleDelayedAction(LoadMediaResource);
+        invokeResourceSelectionAlgorithm();
+        // Ignore current |m_nextChildNodeToConsider| and consider |source|.
         m_nextChildNodeToConsider = source;
         return;
     }
 
     if (m_currentSourceNode && source == m_currentSourceNode->nextSibling()) {
         WTF_LOG(Media, "HTMLMediaElement::sourceWasAdded(%p) - <source> inserted immediately after current source", this);
+        // Ignore current |m_nextChildNodeToConsider| and consider |source|.
         m_nextChildNodeToConsider = source;
         return;
     }
 
+    // Consider current |m_nextChildNodeToConsider| as it is already in the middle of processing.
     if (m_nextChildNodeToConsider)
         return;
 
     if (m_loadState != WaitingForSource)
         return;
 
     // 4.8.9.5, resource selection algorithm, source elements section:
     // 21. Wait until the node after pointer is a node other than the end of the list. (This step might wait forever.)
     // 22. Asynchronously await a stable state...
     // 23. Set the element's delaying-the-load-event flag back to true (this delays the load event again, in case
@@ skipping 299 matching lines @@
         }
 
         refreshCachedTime();
 
         m_playbackProgressTimer.stop();
         m_playing = false;
         double time = currentTime();
         if (time > m_lastSeekTime)
             addPlayedRange(m_lastSeekTime, time);
 
-        if (couldPlayIfEnoughData())
-            prepareToPlay();
-
         if (mediaControls())
             mediaControls()->playbackStopped();
     }
 
     if (layoutObject())
         layoutObject()->updateFromElement();
 }
 
 void HTMLMediaElement::stopPeriodicTimers()
 {
     m_progressEventTimer.stop();
     m_playbackProgressTimer.stop();
 }
 
 void HTMLMediaElement::clearMediaPlayerAndAudioSourceProviderClientWithoutLocking()
 {
     audioSourceProvider().setClient(nullptr);
     if (m_webMediaPlayer) {
         m_audioSourceProvider.wrap(nullptr);
         m_webMediaPlayer.clear();
     }
 }
 
-void HTMLMediaElement::clearMediaPlayer(int flags)
+void HTMLMediaElement::clearMediaPlayer()
 {
     forgetResourceSpecificTracks();
 
     closeMediaSource();
 
     cancelDeferredLoad();
 
     {
         AudioSourceProviderClientLockScope scope(*this);
         clearMediaPlayerAndAudioSourceProviderClientWithoutLocking();
     }
 
     stopPeriodicTimers();
     m_loadTimer.stop();
 
-    m_pendingActionFlags &= ~flags;
+    m_pendingActionFlags = 0;
     m_loadState = WaitingForSource;
 
     // We can't cast if we don't have a media player.
     m_remoteRoutesAvailable = false;
     m_playingRemotely = false;
     if (mediaControls())
         mediaControls()->refreshCastButtonVisibilityWithoutUpdate();
 
     if (layoutObject())
         layoutObject()->setShouldDoFullPaintInvalidation();
 }
 
 void HTMLMediaElement::stop()
 {
     WTF_LOG(Media, "HTMLMediaElement::stop(%p)", this);
 
     recordMetricsIfPausing();
 
     // Close the async event queue so that no events are enqueued.
     cancelPendingEventsAndCallbacks();
     m_asyncEventQueue->close();
 
-    // Stop the playback without generating events
-    clearMediaPlayer(-1);
+    // Clear everything in the Media Element
+    clearMediaPlayer();
     m_readyState = HAVE_NOTHING;
     m_readyStateMaximum = HAVE_NOTHING;
     setNetworkState(NETWORK_EMPTY);
     setShouldDelayLoadEvent(false);
     m_currentSourceNode = nullptr;
     invalidateCachedTime();
     cueTimeline().updateActiveCues(0);
     m_playing = false;
     m_paused = true;
     m_seeking = false;
@@ skipping 350 matching lines @@
 }
 
 void* HTMLMediaElement::preDispatchEventHandler(Event* event)
 {
     if (event && event->type() == EventTypeNames::webkitfullscreenchange)
         configureMediaControls();
 
     return nullptr;
 }
 
-// TODO(srirama.m): Refactor this and clearMediaPlayer to the extent possible.
+// TODO(srirama.m): Merge it to resetMediaElement if possible and remove it.
 void HTMLMediaElement::resetMediaPlayerAndMediaSource()
 {
     closeMediaSource();
 
     {
         AudioSourceProviderClientLockScope scope(*this);
         clearMediaPlayerAndAudioSourceProviderClientWithoutLocking();
     }
 
     // We haven't yet found out if any remote routes are available.
@@ skipping 283 matching lines @@
 {
     visitor->trace(m_client);
 }
 
 DEFINE_TRACE(HTMLMediaElement::AudioSourceProviderImpl)
 {
     visitor->trace(m_client);
 }
 
 } // namespace blink