macosx: Fix resume playback in certain situations

For resumption we need to rely on the "time" variable instead of
"position", as the total duration of the file might not have been
set yet.

Also simplifies the code.

close #11981

modules/gui/macosx/playlist.m

@@ -1527,14 +1527,6 @@
 
         NSNumber *lastPosition = [recentlyPlayedFiles objectForKey:url];
         if (lastPosition && lastPosition.intValue > 0) {
-            vlc_value_t pos;
-            var_Get(p_input_thread, "position", &pos);
-            float f_current_pos = 100. * pos.f_float;
-            long long int dur = input_item_GetDuration(p_item) / 1000000;
-            int current_pos_in_sec = (f_current_pos * dur) / 100;
-
-            if (current_pos_in_sec >= lastPosition.intValue)
-                return;
 
             int settingValue = config_GetInt(VLCIntf, "macosx-continue-playback");
             NSInteger returnValue = NSAlertErrorReturn;
@@ -1550,9 +1542,9 @@
             if (returnValue == NSAlertAlternateReturn || settingValue == 2)
                 lastPosition = [NSNumber numberWithInt:0];
 
-            pos.f_float = (float)lastPosition.intValue / (float)dur;
-            msg_Dbg(VLCIntf, "continuing playback at %2.2f", pos.f_float);
-            var_Set(p_input_thread, "position", pos);
+            mtime_t lastPos = (mtime_t)lastPosition.intValue * 1000000;
+            msg_Dbg(VLCIntf, "continuing playback at %lld", lastPos);
+            var_SetTime(p_input_thread, "time", lastPos);
 
             if (returnValue == NSAlertOtherReturn)
                 config_PutInt(VLCIntf, "macosx-continue-playback", 1);
@@ -1581,15 +1573,14 @@
     NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
     NSMutableDictionary *mutDict = [[NSMutableDictionary alloc] initWithDictionary:[defaults objectForKey:@"recentlyPlayedMedia"]];
 
-    vlc_value_t pos;
-    var_Get(p_input_thread, "position", &pos);
-    float f_current_pos = 100. * pos.f_float;
-    long long int dur = input_item_GetDuration(p_item) / 1000000;
-    int current_pos_in_sec = (f_current_pos * dur) / 100;
+    float relativePos = var_GetFloat(p_input_thread, "position");
+    mtime_t pos = var_GetTime(p_input_thread, "time") / 1000000;
+    mtime_t dur = input_item_GetDuration(p_item) / 1000000;
+
     NSMutableArray *mediaList = [[defaults objectForKey:@"recentlyPlayedMediaList"] mutableCopy];
 
-    if (pos.f_float > .05 && pos.f_float < .95 && dur > 180) {
-        [mutDict setObject:[NSNumber numberWithInt:current_pos_in_sec] forKey:url];
+    if (relativePos > .05 && relativePos < .95 && dur > 180) {
+        [mutDict setObject:[NSNumber numberWithInt:pos] forKey:url];
 
         [mediaList removeObject:url];
         [mediaList addObject:url];