Use xine-ui relative seek method to work around long-standing libxine FLAC seek failure

This resolves Bug 1204

amarok/src/engine/xine/xine-engine.cpp

@@ -47,10 +47,12 @@ extern "C"
 #define LLONG_MAX 9223372036854775807LL
 #endif
 
-
 //define this to use xine in a more standard way
 //#define XINE_SAFE_MODE
 
+//define this to enable libxine debug spew
+//#define XINE_DEBUG_ENGINE 1
+
 
 ///some logging static globals
 namespace Log
@@ -174,8 +176,13 @@ XineEngine::makeNewStream()
       return false;
    }
 
-   if( m_eventQueue )
+   #ifdef XINE_DEBUG_ENGINE
+   xine_set_param(m_stream, XINE_PARAM_VERBOSITY, XINE_VERBOSITY_DEBUG);
+   #endif // XINE_DEBUG_ENGINE
+
+   if( m_eventQueue ) {
       xine_event_dispose_queue( m_eventQueue );
+   }
 
    xine_event_create_listener_thread(
          m_eventQueue = xine_event_new_queue( m_stream ),
@@ -203,8 +210,9 @@ XineEngine::makeNewStream()
 bool
 XineEngine::ensureStream()
 {
-   if( !m_stream )
+   if( !m_stream ) {
       return makeNewStream();
+   }
 
    return true;
 }
@@ -242,7 +250,7 @@ XineEngine::load( const KURL &url, bool isStream )
        setEqualizerParameters( m_intPreamp, m_equalizerGains );
     }
 
-   // for users who stubbonly refuse to use DMIX or buy a good soundcard
+   // for users who stubbornly refuse to use DMIX or buy a good soundcard
    // why doesn't xine do this? I cannot say.
    xine_close( m_stream );
 
@@ -448,8 +456,9 @@ XineEngine::state() const
 uint
 XineEngine::position() const
 {
-    if ( state() == Engine::Empty )
+    if ( state() == Engine::Empty ) {
        return 0;
+    }
 
     int pos;
     int time = 0;
@@ -509,16 +518,45 @@ XineEngine::length() const
 void
 XineEngine::seek( uint ms )
 {
-    if( !ensureStream() )
+    if( !ensureStream() ) {
+        return;
+    }
+
+    bool seekable = (xine_get_stream_info( m_stream, XINE_STREAM_INFO_SEEKABLE ) != 0);
+    if (!seekable) {
         return;
+    }
+
+    bool use_xine_ui_seek_method = false;
+    TQString audioCodec = TQString::fromUtf8(xine_get_meta_info(m_stream, XINE_META_INFO_SYSTEMLAYER));
+    if (audioCodec == "FLAC") {
+        // Work around Xine bug with FLAC files
+        // See Bug 1204
+        use_xine_ui_seek_method = true;
+    }
 
     if( xine_get_param( m_stream, XINE_PARAM_SPEED ) == XINE_SPEED_PAUSE ) {
         // FIXME this is a xine API issue really, they need to add a seek function
+        if (use_xine_ui_seek_method) {
+            int pos, time, length = 0;
+            xine_get_pos_length( m_stream, &pos, &time, &length );
+            xine_play( m_stream, ((ms*65535.0)/length), 0 );
+        }
+        else {
             xine_play( m_stream, 0, (int)ms );
+        }
         xine_set_param( m_stream, XINE_PARAM_SPEED, XINE_SPEED_PAUSE );
     }
-    else
+    else {
+        if (use_xine_ui_seek_method) {
+            int pos, time, length = 0;
+            xine_get_pos_length( m_stream, &pos, &time, &length );
+            xine_play( m_stream, ((ms*65535.0)/length), 0 );
+        }
+        else {
             xine_play( m_stream, 0, (int)ms );
+        }
+    }
 }
 
 void