[MSE][Mac] Disable AVFoundation when enabling the MockMediaPlayerMedi…

…aSource.

https://bugs.webkit.org/show_bug.cgi?id=125338

Reviewed by Darin Adler.

The MediaSource API has some assumptions which break if more than one installed
media engine supports MediaSources at the same time. So when enabling the mock
media source engine in DRT or WKTR, disable AVFoundation so that only the mock
engine will support media source loading.

* testing/Internals.cpp:
(WebCore::Internals::initializeMockMediaSource):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@160263 268f45cc-cd09-0410-ab3c-d52691b4dbfc

Source/WebCore/ChangeLog

@@ -1,3 +1,18 @@
+2013-12-05  Jer Noble  <jer.noble@apple.com>
+
+        [MSE][Mac] Disable AVFoundation when enabling the MockMediaPlayerMediaSource.
+        https://bugs.webkit.org/show_bug.cgi?id=125338
+
+        Reviewed by Darin Adler.
+
+        The MediaSource API has some assumptions which break if more than one installed
+        media engine supports MediaSources at the same time. So when enabling the mock
+        media source engine in DRT or WKTR, disable AVFoundation so that only the mock
+        engine will support media source loading.
+
+        * testing/Internals.cpp:
+        (WebCore::Internals::initializeMockMediaSource):
+
 2013-12-06  Antti Koivisto  <antti@apple.com>
 
         Use NeverDestroyed instead of DEFINE_STATIC_LOCAL

Source/WebCore/testing/Internals.cpp

@@ -2260,6 +2260,9 @@ bool Internals::isPluginUnavailabilityIndicatorObscured(Element* element, Except
 #if ENABLE(MEDIA_SOURCE)
 void Internals::initializeMockMediaSource()
 {
+#if USE(AVFOUNDATION)
+    WebCore::Settings::setAVFoundationEnabled(false);
+#endif
     MediaPlayerFactorySupport::callRegisterMediaEngine(MockMediaPlayerMediaSource::registerMediaEngine);
 }
 #endif