fix subtitles position (aspect ratio)

the subtitle was displayed fine but since aspect ratios didn't match it
wasn't positioned correctly on the vout. ie:
--------------
|            |
|            |
|      subtit|
|            |
-------------- ( http://people.videolan.org/~dionoea/vlcsubs.png )

now it's displayed in the center but the letters are scaled horrizontaly
(which doesn't look too good ... but at least everything is displayed)
( http://people.videolan.org/~dionoea/vlcsubs2.png )

modules/codec/dvbsub.c

@@ -102,7 +102,7 @@ vlc_module_begin();
 
     add_integer( ENC_CFG_PREFIX "x", -1, NULL, ENC_POSX_TEXT, ENC_POSX_LONGTEXT, VLC_FALSE );
     add_integer( ENC_CFG_PREFIX "y", -1, NULL, ENC_POSY_TEXT, ENC_POSY_LONGTEXT, VLC_FALSE );
-    add_integer( ENC_CFG_PREFIX "timeout", 15, NULL, TIMEOUT_TEXT, TIMEOUT_LONGTEXT, VLC_FALSE );    
+    add_integer( ENC_CFG_PREFIX "timeout", 15, NULL, TIMEOUT_TEXT, TIMEOUT_LONGTEXT, VLC_FALSE );
 vlc_module_end();
 
 static const char *ppsz_enc_options[] = { NULL };
@@ -230,7 +230,7 @@ struct decoder_sys_t
 #define DVBSUB_OT_BASIC_CHAR            0x01
 #define DVBSUB_OT_COMPOSITE_STRING      0x02
 /* Pixel DATA TYPES */
-/* According to EN 300-743, table 9 */ 
+/* According to EN 300-743, table 9 */
 #define DVBSUB_DT_2BP_CODE_STRING       0x10
 #define DVBSUB_DT_4BP_CODE_STRING       0x11
 #define DVBSUB_DT_8BP_CODE_STRING       0x12
@@ -279,7 +279,7 @@ static int Open( vlc_object_t *p_this )
     p_sys = p_dec->p_sys = malloc( sizeof(decoder_sys_t) );
     memset( p_sys, 0, sizeof(decoder_sys_t) );
 
-    p_sys->i_pts          = (mtime_t) 0;    
+    p_sys->i_pts          = (mtime_t) 0;
     p_sys->i_id           = p_dec->fmt_in.subs.dvb.i_id & 0xFFFF;
     p_sys->i_ancillary_id = p_dec->fmt_in.subs.dvb.i_id >> 16;
 
@@ -328,7 +328,7 @@ static void Close( vlc_object_t *p_this )
 
     var_Destroy( p_this, DVBSUB_CFG_PREFIX "x" );
     var_Destroy( p_this, DVBSUB_CFG_PREFIX "y" );
-    var_Destroy( p_this, DVBSUB_CFG_PREFIX "position" );    
+    var_Destroy( p_this, DVBSUB_CFG_PREFIX "position" );
 
     free_all( p_dec );
     free( p_sys );
@@ -1387,7 +1387,10 @@ static subpicture_t *render( decoder_t *p_dec )
         /* Create new SPU region */
         memset( &fmt, 0, sizeof(video_format_t) );
         fmt.i_chroma = VLC_FOURCC('Y','U','V','P');
-        fmt.i_aspect = 0; /* 0 means use aspect ratio of background video */
+        /* FIXME -> subtitles will be squished when using VOUT_ASPECT_FACTOR
+           and they won't be placed correctly when using 0 and the video's
+           aspect ratio is different than the vout's aspect ratio */
+        fmt.i_aspect = VOUT_ASPECT_FACTOR;
         fmt.i_width = fmt.i_visible_width = p_region->i_width;
         fmt.i_height = fmt.i_visible_height = p_region->i_height;
         fmt.i_x_offset = fmt.i_y_offset = 0;
@@ -1553,7 +1556,7 @@ static int OpenEncoder( vlc_object_t *p_this )
     return VLC_SUCCESS;
 }
 
-/* FIXME: this routine is a hack to convert VLC_FOURCC('Y','U','V','A') 
+/* FIXME: this routine is a hack to convert VLC_FOURCC('Y','U','V','A')
  *        into VLC_FOURCC('Y','U','V','P')
  */
 static subpicture_t *YuvaYuvp( encoder_t *p_enc, subpicture_t *p_subpic )
@@ -1901,7 +1904,7 @@ static void encode_page_composition( encoder_t *p_enc, bs_t *s,
         }
 
         if( ( p_sys->p_regions[i_regions].i_width <
-              (int)p_region->fmt.i_visible_width ) || 
+              (int)p_region->fmt.i_visible_width ) ||
             ( p_sys->p_regions[i_regions].i_width >
               (int)p_region->fmt.i_visible_width ) )
         {