Related to preview (re #1340): handle problems with starting or stopping preview during a call

git-svn-id: https://svn.pjsip.org/repos/pjproject/trunk@3758 74dad513-b988-da41-8d7b-12977e46ad98
diff --git a/pjsip/include/pjsua-lib/pjsua_internal.h b/pjsip/include/pjsua-lib/pjsua_internal.h
index 46547ee..01d3288 100644
--- a/pjsip/include/pjsua-lib/pjsua_internal.h
+++ b/pjsip/include/pjsua-lib/pjsua_internal.h
@@ -324,6 +324,7 @@
     pjmedia_vid_port		*vp_rend;	/**< Renderer vidport	*/
     pjmedia_port		*tee;		/**< Video tee		*/
     pjmedia_vid_dev_index	 preview_cap_id;/**< Capture dev id	*/
+    pj_bool_t			 preview_running;/**< Preview is started*/
     pj_bool_t			 is_native; 	/**< Preview is by dev  */
 } pjsua_vid_win;