video_filter_rss: use a timer to update the feed. This way we will be able to

have an asynchronous fetch (not the case for the moment as the lock is taken
during the complete fetch ).

modules/video_filter/rss.c

@@ -61,6 +61,8 @@ static int FetchRSS( filter_t * );
 static void FreeRSS( filter_t * );
 static int ParseUrls( filter_t *, char * );
 
+static void Fetch( void * );
+
 static const int pi_color_values[] = {
                0xf0000000, 0x00000000, 0x00808080, 0x00C0C0C0,
                0x00FFFFFF, 0x00800000, 0x00FF0000, 0x00FF00FF, 0x00FFFF00,
@@ -100,6 +102,8 @@ typedef struct rss_feed_t
 struct filter_sys_t
 {
     vlc_mutex_t lock;
+    vlc_timer_t timer;  /* Timer to refresh the rss feeds */
+    bool b_fetched;
 
     int i_xoff, i_yoff;  /* offsets for the display string in the video window */
     int i_pos; /* permit relative positioning (top, bottom, left, right, center) */
@@ -116,7 +120,6 @@ struct filter_sys_t
     rss_feed_t *p_feeds;
 
     int i_ttl;
-    time_t t_last_update;
     bool b_images;
     int i_title;
 
@@ -235,7 +238,6 @@ static int CreateFilter( vlc_object_t *p_this )
 {
     filter_t *p_filter = (filter_t *)p_this;
     filter_sys_t *p_sys;
-    int i_feed;
     int i_ret = VLC_ENOMEM;
     char *psz_urls;
 
@@ -288,34 +290,20 @@ static int CreateFilter( vlc_object_t *p_this )
     }
     free( psz_urls );
 
-    if( FetchRSS( p_filter ) )
-    {
-        msg_Err( p_filter, "failed while fetching RSS ... too bad" );
-        text_style_Delete( p_sys->p_style );
-        i_ret = VLC_EGENERIC;
-        goto error;
-    }
-    p_sys->t_last_update = time( NULL );
-
-    if( p_sys->i_feeds == 0 )
-    {
-        text_style_Delete( p_sys->p_style );
-        i_ret = VLC_EGENERIC;
-        goto error;
-    }
-    for( i_feed=0; i_feed < p_sys->i_feeds; i_feed ++ )
-    {
-        if( p_sys->p_feeds[i_feed].i_items == 0 )
-        {
-            DestroyFilter( p_this );
-            return VLC_EGENERIC;
-        }
-    }
-
     /* Misc init */
     vlc_mutex_init( &p_sys->lock );
     p_filter->pf_sub_filter = Filter;
     p_sys->last_date = (mtime_t)0;
+    p_sys->b_fetched = false;
+
+    /* Create and arm the timer */
+    if( vlc_timer_create( &p_sys->timer, Fetch, p_filter ) )
+    {
+        vlc_mutex_destroy( &p_sys->lock );
+        goto error;
+    }
+    vlc_timer_schedule( p_sys->timer, false, 1,
+                        (mtime_t)(p_sys->i_ttl)*1000000 );
 
     return VLC_SUCCESS;
 
@@ -332,7 +320,9 @@ static void DestroyFilter( vlc_object_t *p_this )
     filter_t *p_filter = (filter_t *)p_this;
     filter_sys_t *p_sys = p_filter->p_sys;
 
+    vlc_timer_destroy( p_sys->timer );
     vlc_mutex_destroy( &p_sys->lock );
+
     text_style_Delete( p_sys->p_style );
     free( p_sys->psz_marquee );
     FreeRSS( p_filter );
@@ -358,28 +348,21 @@ static subpicture_t *Filter( filter_t *p_filter, mtime_t date )
 
     vlc_mutex_lock( &p_sys->lock );
 
-    if( p_sys->last_date
-       + ( p_sys->i_cur_char == 0 && p_sys->i_cur_item == ( p_sys->i_title == scroll_title ? -1 : 0 ) ? 5 : 1 )
-           /* ( ... ? 5 : 1 ) means "wait 5 times more for the 1st char" */
-       * p_sys->i_speed > date )
+    /* Check if the feeds have been fetched and that we have some feeds */
+    /* TODO: check that we have items for each feeds */
+    if( !p_sys->b_fetched && p_sys->i_feeds > 0 )
     {
         vlc_mutex_unlock( &p_sys->lock );
         return NULL;
     }
 
-    /* Do we need to update the feeds ? */
-    if( p_sys->i_ttl
-        && time( NULL ) > p_sys->t_last_update + (time_t)p_sys->i_ttl )
-    {
-        msg_Dbg( p_filter, "Forcing update of all the RSS feeds" );
-        if( FetchRSS( p_filter ) )
+    if( p_sys->last_date
+       + ( p_sys->i_cur_char == 0 && p_sys->i_cur_item == ( p_sys->i_title == scroll_title ? -1 : 0 ) ? 5 : 1 )
+           /* ( ... ? 5 : 1 ) means "wait 5 times more for the 1st char" */
+       * p_sys->i_speed > date )
     {
-            msg_Err( p_filter, "Failed while fetching RSS ... too bad" );
         vlc_mutex_unlock( &p_sys->lock );
-            return NULL; /* FIXME : we most likely messed up all the data,
-                          * so we might need to do something about it */
-        }
-        p_sys->t_last_update = time( NULL );
+        return NULL;
     }
 
     p_sys->last_date = date;
@@ -620,7 +603,7 @@ static char *removeWhiteChars( const char *psz_src )
 
 
 /****************************************************************************
- * Parse url list, psz_urls must be non empty
+ * Parse url list, psz_urls must be non empty (TODO: check it !)
  ***************************************************************************/
 static int ParseUrls( filter_t *p_filter, char *psz_urls )
 {
@@ -1014,3 +997,14 @@ static void FreeRSS( filter_t *p_filter)
     free( p_sys->p_feeds );
     p_sys->i_feeds = 0;
 }
+
+static void Fetch( void *p_data )
+{
+    filter_t *p_filter = p_data;
+    filter_sys_t *p_sys = p_filter->p_sys;
+
+    vlc_mutex_lock( &p_sys->lock );
+    FetchRSS( p_filter );
+    p_sys->b_fetched = true;
+    vlc_mutex_unlock( &p_sys->lock );
+}