Bug 1282410 - part1 : open unsupported type media. r=cpearce

dom/html/HTMLMediaElement.cpp

@@ -1031,6 +1031,7 @@ void HTMLMediaElement::NoSupportedMediaSourceError()
   DispatchAsyncEvent(NS_LITERAL_STRING("error"));
   ChangeDelayLoadStatus(false);
   UpdateAudioChannelPlayingState();
+  OpenUnsupportedMediaWithExtenalAppIfNeeded();
 }
 
 typedef void (HTMLMediaElement::*SyncSectionFn)();
@@ -2706,6 +2707,10 @@ HTMLMediaElement::PlayInternal(bool aCallerIsChrome)
   UpdateSrcMediaStreamPlaying();
   UpdateAudioChannelPlayingState();
 
+  // The check here is to handle the case that the media element starts playing
+  // after it loaded fail. eg. preload the data before playing.
+  OpenUnsupportedMediaWithExtenalAppIfNeeded();
+
   return NS_OK;
 }
 
@@ -6013,6 +6018,41 @@ HTMLMediaElement::IsAudible() const
   return true;
 }
 
+bool
+HTMLMediaElement::HaveFailedWithSourceNotSupportedError() const
+{
+  if (!mError) {
+    return false;
+  }
+
+  uint16_t errorCode;
+  mError->GetCode(&errorCode);
+  return (mNetworkState == nsIDOMHTMLMediaElement::NETWORK_NO_SOURCE &&
+          errorCode == nsIDOMMediaError::MEDIA_ERR_SRC_NOT_SUPPORTED);
+}
+
+void
+HTMLMediaElement::OpenUnsupportedMediaWithExtenalAppIfNeeded()
+{
+  if (!Preferences::GetBool("media.openUnsupportedTypeWithExternalApp")) {
+    return;
+  }
+
+  if (!HaveFailedWithSourceNotSupportedError()) {
+    return;
+  }
+
+  // If media doesn't start playing, we don't need to open it.
+  if (mPaused) {
+    return;
+  }
+
+  nsContentUtils::DispatchTrustedEvent(OwnerDoc(), static_cast<nsIContent*>(this),
+                                       NS_LITERAL_STRING("OpenMediaWithExtenalApp"),
+                                       true,
+                                       true);
+}
+
 static const char* VisibilityString(Visibility aVisibility) {
   switch(aVisibility) {
     case Visibility::UNTRACKED: {