Implement HTMLMediaElement::srcObject.

Source/core/html/HTMLMediaElement.cpp

Index: Source/core/html/HTMLMediaElement.cpp
diff --git a/Source/core/html/HTMLMediaElement.cpp b/Source/core/html/HTMLMediaElement.cpp
index 91ef6708e6f5e78594ef9b36ad751aec9955cc39..7091070161a06ee81ebe6d13c4a33a10d2ec2d6c 100644
--- a/Source/core/html/HTMLMediaElement.cpp
+++ b/Source/core/html/HTMLMediaElement.cpp
@@ -48,6 +48,7 @@
 #include "core/html/MediaController.h"
 #include "core/html/MediaError.h"
 #include "core/html/MediaFragmentURIParser.h"
+#include "core/html/MediaProvider.h"
 #include "core/html/TimeRanges.h"
 #include "core/html/shadow/MediaControls.h"
 #include "core/html/track/AudioTrack.h"
@@ -325,6 +326,7 @@ HTMLMediaElement::HTMLMediaElement(const QualifiedName& tagName, Document& docum
     , m_lastTimeUpdateEventWallTime(0)
     , m_lastTimeUpdateEventMovieTime(std::numeric_limits<double>::max())
     , m_loadState(WaitingForSource)
+    , m_srcObject(std::nullptr_t())
     , m_deferredLoadState(NotDeferred)
     , m_deferredLoadTimer(this, &HTMLMediaElement::deferredLoadTimerFired)
     , m_webLayer(0)
@@ -682,6 +684,19 @@ PassRefPtrWillBeRawPtr<MediaError> HTMLMediaElement::error() const
     return m_error;
 }
 
+void HTMLMediaElement::setSrcObject(RawPtr<MediaProvider> mediaProvider)
+{
+    WTF_LOG(Media, "HTMLMediaElement::setSrcObject()");
+    m_srcObject = mediaProvider;
+    clearMediaPlayer(LoadMediaResource);
+    scheduleDelayedAction(LoadMediaResource);
+}
+
+MediaProvider* HTMLMediaElement::srcObject() const
+{
+    return m_srcObject.get();
+}
+
 void HTMLMediaElement::setSrc(const AtomicString& url)
 {
     setAttribute(srcAttr, url);
@@ -855,29 +870,32 @@ void HTMLMediaElement::selectMediaResource()
 {
     WTF_LOG(Media, "HTMLMediaElement::selectMediaResource");
 
-    enum Mode { attribute, children };
-
-    // 3 - If the media element has a src attribute, then let mode be attribute.
-    Mode mode = attribute;
-    if (!fastHasAttribute(srcAttr)) {
-        // Otherwise, if the media element does not have a src attribute but has a source
-        // element child, then let mode be children and let candidate be the first such
-        // source element child in tree order.
-        if (HTMLSourceElement* element = Traversal<HTMLSourceElement>::firstChild(*this)) {
-            mode = children;
-            m_nextChildNodeToConsider = element;
-            m_currentSourceNode = nullptr;
-        } else {
-            // Otherwise the media element has neither a src attribute nor a source element
-            // child: set the networkState to NETWORK_EMPTY, and abort these steps; the
-            // synchronous section ends.
-            m_loadState = WaitingForSource;
-            setShouldDelayLoadEvent(false);
-            m_networkState = NETWORK_EMPTY;
+    enum Mode {Object, Attribute, Children};
+
+    // 3 - Decide which source to load.
+    // If the media element has a srcObject let the mode be object.
+    // If it has a src attribute, let the mode be attribute.
+    // If it has a source element, let the mode be Children.
+    Mode mode = Object;
+    if (srcObject()) {
+        mode = Object;
+    } else if (fastHasAttribute(srcAttr)) {
+        mode = Attribute;
+    } else if (Traversal<HTMLSourceElement>::firstChild(*this)) {
+        mode = Children;
+        HTMLSourceElement* element = Traversal<HTMLSourceElement>::firstChild(*this);
+        m_nextChildNodeToConsider = element;
+        m_currentSourceNode = nullptr;
+    } else {
+        // Otherwise the media element has no source.
+        // set the networkState to NETWORK_EMPTY, and abort these steps; the
+        // synchronous section ends.
+        m_loadState = WaitingForSource;
+        setShouldDelayLoadEvent(false);
+        m_networkState = NETWORK_EMPTY;
 
-            WTF_LOG(Media, "HTMLMediaElement::selectMediaResource, nothing to load");
-            return;
-        }
+        WTF_LOG(Media, "HTMLMediaElement::selectMediaResource, nothing to load");
+        return;
     }
 
     // 4 - Set the media element's delaying-the-load-event flag to true (this delays the load event),
@@ -888,34 +906,64 @@ void HTMLMediaElement::selectMediaResource()
     // 5 - Queue a task to fire a simple event named loadstart at the media element.
     scheduleEvent(EventTypeNames::loadstart);
 
-    // 6 - If mode is attribute, then run these substeps
-    if (mode == attribute) {
-        m_loadState = LoadingFromSrcAttr;
+    // 6 - Load the correct source.
+    switch (mode) {
+    case Object:
+        loadSourceFromObject();
+        break;
+    case Attribute:
+        loadSourceFromAttribute();
+        break;
+    case Children:
+        loadNextSourceChild();
+        break;
+    }
+}
+
+void HTMLMediaElement::loadSourceFromObject()
+{
+    m_loadState = LoadingFromSrcObject;
 
-        // If the src attribute's value is the empty string ... jump down to the failed step below
-        KURL mediaURL = getNonEmptyURLAttribute(srcAttr);
-        if (mediaURL.isEmpty()) {
-            mediaLoadingFailed(WebMediaPlayer::NetworkStateFormatError);
-            WTF_LOG(Media, "HTMLMediaElement::selectMediaResource, empty 'src'");
-            return;
-        }
+    KURL mediaURL = document().completeURL(m_srcObject->getObjectUrl());
 
-        if (!isSafeToLoadURL(mediaURL, Complain)) {
-            mediaLoadingFailed(WebMediaPlayer::NetworkStateFormatError);
-            return;
-        }
+    if (!isSafeToLoadURL(mediaURL, Complain)) {
+        mediaLoadingFailed(WebMediaPlayer::NetworkStateFormatError);
+        return;
+    }
+
+    // No type or key system information is available when the url comes
+    // from the 'srcObject' so MediaPlayer
+    // will have to pick a media engine based on the file extension.
+    ContentType contentType((String()));
+    loadResource(mediaURL, contentType, String());
+    WTF_LOG(Media, "HTMLMediaElement::selectMediaResource, using 'srcObject' attribute.");
+    return;
+}
+
+void HTMLMediaElement::loadSourceFromAttribute()
+{
+    m_loadState = LoadingFromSrcAttr;
+
+    // If the src attribute's value is the empty string ... jump down to the failed step below
+    KURL mediaURL = getNonEmptyURLAttribute(srcAttr);
+    if (mediaURL.isEmpty()) {
+        mediaLoadingFailed(WebMediaPlayer::NetworkStateFormatError);
+        WTF_LOG(Media, "HTMLMediaElement::selectMediaResource, empty 'src'");
+        return;
+    }
 
-        // No type or key system information is available when the url comes
-        // from the 'src' attribute so MediaPlayer
-        // will have to pick a media engine based on the file extension.
-        ContentType contentType((String()));
-        loadResource(mediaURL, contentType, String());
-        WTF_LOG(Media, "HTMLMediaElement::selectMediaResource, using 'src' attribute url");
+    if (!isSafeToLoadURL(mediaURL, Complain)) {
+        mediaLoadingFailed(WebMediaPlayer::NetworkStateFormatError);
         return;
     }
 
-    // Otherwise, the source elements will be used
-    loadNextSourceChild();
+    // No type or key system information is available when the url comes
+    // from the 'src' attribute so MediaPlayer
+    // will have to pick a media engine based on the file extension.
+    ContentType contentType((String()));
+    loadResource(mediaURL, contentType, String());
+    WTF_LOG(Media, "HTMLMediaElement::selectMediaResource, using 'src' attribute url");
+    return;
 }
 
 void HTMLMediaElement::loadNextSourceChild()