Added a way to flush video filters and video filter chains.

 It is not yet used, but it will be needed for filter that need to delay
frames.

include/vlc_filter.h

@@ -65,6 +65,7 @@ struct filter_t
         struct
         {
             picture_t * (*pf_filter) ( filter_t *, picture_t * );
+            void        (*pf_flush)( filter_t * );
             picture_t * (*pf_buffer_new) ( filter_t * );
             void        (*pf_buffer_del) ( filter_t *, picture_t * );
             /* Filter mouse state.
@@ -80,6 +81,7 @@ struct filter_t
                                      const vlc_mouse_t *p_new );
         } video;
 #define pf_video_filter     u.video.pf_filter
+#define pf_video_flush      u.video.pf_flush
 #define pf_video_mouse      u.video.pf_mouse
 #define pf_video_buffer_new u.video.pf_buffer_new
 #define pf_video_buffer_del u.video.pf_buffer_del
@@ -163,6 +165,15 @@ static inline void filter_DeletePicture( filter_t *p_filter, picture_t *p_pictur
     p_filter->pf_video_buffer_del( p_filter, p_picture );
 }
 
+/**
+ * This function will flush the state of a video filter.
+ */
+static inline void filter_FlushPictures( filter_t *p_filter )
+{
+    if( p_filter->pf_video_flush )
+        p_filter->pf_video_flush( p_filter );
+}
+
 /**
  * This function will return a new subpicture usable by p_filter as an output
  * buffer. You have to release it using filter_DeleteSubpicture or by returning
@@ -368,6 +379,11 @@ VLC_EXPORT( const es_format_t *, filter_chain_GetFmtOut, ( filter_chain_t * ) );
  */
 VLC_EXPORT( picture_t *, filter_chain_VideoFilter, ( filter_chain_t *, picture_t * ) );
 
+/**
+ * Flush a video filter chain.
+ */
+VLC_EXPORT( void, filter_chain_VideoFlush, ( filter_chain_t * ) );
+
 /**
  * Apply the filter chain to a audio block.
  *

src/libvlccore.sym

@@ -136,6 +136,7 @@ filter_chain_New
 filter_chain_Reset
 filter_chain_SubFilter
 filter_chain_VideoFilter
+filter_chain_VideoFlush
 filter_ConfigureBlend
 filter_DeleteBlend
 filter_NewBlend

src/misc/filter_chain.c

@@ -233,6 +233,17 @@ picture_t *filter_chain_VideoFilter( filter_chain_t *p_chain, picture_t *p_pic )
     return p_pic;
 }
 
+void filter_chain_VideoFlush( filter_chain_t *p_chain )
+{
+    for( chained_filter_t *f = p_chain->first; f != NULL; f = f->next )
+    {
+        filter_t *p_filter = &f->filter;
+
+        filter_FlushPictures( p_filter );
+    }
+}
+
+
 block_t *filter_chain_AudioFilter( filter_chain_t *p_chain, block_t *p_block )
 {
     for( chained_filter_t *f = p_chain->first; f != NULL; f = f->next )