Bug 147126

The problem is still there with 1.4.7.
Steps to reproduce:
setup amarok to use the xine engine
remove mp3 support from xine
Install following service
/opt/kde3/share/services/amarok_xine-mp3_install.desktop

[Desktop Entry]
Encoding=UTF-8
Type=Service
ServiceTypes=Amarok/CodecInstall
X-KDE-Amarok-codec=mp3
X-KDE-Amarok-engine=xine-engine
Exec=echo blah > /tmp/log

Now if you have a mp3 file laying in your home the popup will work as expected but if you start it without a mp3 file in your home dir or playlist and try to add a mp3 file to the playlist amarok will freeze the moment the dialog pops up.

SVN commit 706845 by markey:

Fixed possible GUI freeze when Amarok was showing the dialog for installing mp3 support. Patch by Sascha Sommer <ssommer@suse.de>.

"The problem seems to be that EngineController::canDecode runs in a seperate
thread than the gui thread. Opening up a Kmessagebox there will prevent
amarok from handling all gui events and everything will freeze. I therefore
put the dialog into an extra function that will later get called from the
statusBar."

BUG: 147126



 M  +4 -0      ChangeLog  
 M  +15 -7     src/enginecontroller.cpp  
 M  +1 -0      src/enginecontroller.h  
 M  +8 -3      src/statusbar/statusBarBase.cpp  


--- branches/stable/extragear/multimedia/amarok/ChangeLog #706844:706845
@@ -2,8 +2,12 @@
 ================
 (C) 2002-2007 the Amarok authors.
 
+
 VERSION 1.4.8
   BUGFIXES:
+    * Fixed possible GUI freeze when Amarok was showing the dialog for
+      installing mp3 support. Patch by Sascha Sommer <ssommer@suse.de>.
+      (BR 147126)
     * Amarok could needlessely reinitialize connections to MySQL databases
       after a configuration change.  Combined with a bug in MySQL libraries,
       this could lead to a crash.
--- branches/stable/extragear/multimedia/amarok/src/enginecontroller.cpp #706844:706845
@@ -244,13 +244,10 @@
     if( engine() != EngineController::instance()->m_voidEngine )
     {
         //we special case this as otherwise users hate us
-        if ( !valid && ext.lower() == "mp3" && !installDistroCodec(AmarokConfig::soundSystem()) )
-            Amarok::StatusBar::instance()->longMessageThreadSafe(
-                    i18n( "<p>The %1 claims it <b>cannot</b> play MP3 files."
-                        "<p>You may want to choose a different engine from the <i>Configure Dialog</i>, or examine "
-                        "the installation of the multimedia-framework that the current engine uses. "
-                        "<p>You may find useful information in the <i>FAQ</i> section of the <i>Amarok HandBook</i>." )
-                    .arg( AmarokConfig::soundSystem() ), KDE::StatusBar::Error );
+        if ( !valid && ext.lower() == "mp3"){
+            QCustomEvent * e = new QCustomEvent( 2000 );
+            QApplication::postEvent( Amarok::StatusBar::instance(), e );
+	}
 
         // Cache this result for the next lookup
         if ( !ext.isEmpty() )
@@ -260,6 +257,17 @@
     return valid;
 }
 
+void EngineController::unplayableNotification() {
+
+    if( !installDistroCodec(AmarokConfig::soundSystem()))
+        Amarok::StatusBar::instance()->longMessageThreadSafe(
+                  i18n( "<p>The %1 claims it <b>cannot</b> play MP3 files."
+                        "<p>You may want to choose a different engine from the <i>Configure Dialog</i>, or examine "
+                        "the installation of the multimedia-framework that the current engine uses. "
+                        "<p>You may find useful information in the <i>FAQ</i> section of the <i>Amarok HandBook</i>." )
+                    .arg( AmarokConfig::soundSystem() ), KDE::StatusBar::Error );
+}
+
 bool EngineController::installDistroCodec( const QString& engine /*Filetype type*/)
 {
     KService::Ptr service = KTrader::self()->query( "Amarok/CodecInstall"
--- branches/stable/extragear/multimedia/amarok/src/enginecontroller.h #706844:706845
@@ -52,6 +52,7 @@
     uint                     trackPosition() const;
 
     EngineBase* loadEngine();
+    void unplayableNotification();
 
     uint trackLength() const { return m_bundle.length() * 1000; }
     const MetaBundle &bundle() const;
--- branches/stable/extragear/multimedia/amarok/src/statusbar/statusBarBase.cpp #706844:706845
@@ -25,6 +25,7 @@
 #include "squeezedtextlabel.h"
 #include "statusBarBase.h"
 #include "threadmanager.h"
+#include "enginecontroller.h"
 
 #include <kio/job.h>
 #include <kiconloader.h>
@@ -343,9 +344,13 @@
 void
 StatusBar::customEvent( QCustomEvent *e )
 {
-    QString *s = static_cast<QString*>( e->data() );
-    longMessage( *s );
-    delete s;
+    if(e->type() == 1000 ){ 
+      QString *s = static_cast<QString*>( e->data() );
+      longMessage( *s );
+      delete s;
+    }else if(e->type() == 2000 ){
+      EngineController::instance()->unplayableNotification();
+    }
 }