codec/avcodec/vaapi_x11.c: Potential picture leaks.

- do picture refcounting from pf_release() functions.

modules/codec/avcodec/vaapi_x11.c

@@ -691,6 +691,8 @@ static int RenderDirectSubpicture(vout_display_t *vd, picture_t *picture, subpic
 
 static void PictureRelease(picture_t *picture)
 {
+    if (picture->i_refcount > 0)
+        picture->i_refcount--;
     free(picture->p_sys);
     picture->p_sys = NULL;
 }
@@ -700,6 +702,9 @@ static void PictureReleaseVoutOwned(picture_t *picture)
     if (!picture->p_sys->b_own_vout)
         abort();
 
+    if (picture->i_refcount > 0)
+        picture->i_refcount--;
+
     vlc_va_surface_t *surface = picture->p_sys->surface;
 #if 0
     /* FIXME: pictures discarded by core will leak VASurfaces */
@@ -726,12 +731,13 @@ static void Render(vout_display_t *vd, picture_t *picture, subpicture_t *subpict
         picture->p_sys = RenderImportPicture(vd, picture);
         if (!picture->p_sys)
             return;
+        assert(picture->p_sys->surface);
         assert(picture->pf_release);
         picture->pf_release = PictureReleaseVoutOwned;
     }
 
     if (picture->p_sys->surface == NULL)
-        abort();
+        return;
 
     vlc_mutex_lock(&picture->p_sys->surface->lock);
 
@@ -757,6 +763,7 @@ static void Render(vout_display_t *vd, picture_t *picture, subpicture_t *subpict
 
 static void ReleaseSurfaceLocked(vlc_va_surface_t *surface)
 {
+    if (surface->i_refcount > 0)
         surface->i_refcount--;
     assert(surface->i_refcount >= 0);
 }
@@ -797,6 +804,7 @@ static void DisplayPicture(vout_display_t *vd, picture_t *pic, subpicture_t *sub
 
     if (pic->p_sys->surface == NULL)
     {
+        assert(!pic->p_sys->b_own_vout);
         msg_Err(vd, "Discarding picture without surface information");
         if (subpicture)
             subpicture_Delete(subpicture);