* General configuration
*****************************************************************************/
-#define CLOCK_FREQ 1000000
+/* All timestamp below or equal to this define are invalid/unset
+ * XXX the numerical value is 0 because of historical reason and will change.*/
+#define VLC_TS_INVALID (0)
+#define CLOCK_FREQ 1000000
/* When creating or destroying threads in blocking mode, delay to poll thread
* status */