New option -session_log

libisoburn/isoburn.h

@@ -319,6 +319,13 @@ struct isoburn_imgen_opts {
     */
     int fifo_size;
 
+
+    /** Output value: Block address of session start as evaluatedfrom media
+                      and other options by libisoburn and libburn.
+        If <0 : Invalid
+        If >=0: Valid block number. Block size is always 2 KiB.
+    */
+    int effective_lba;
 };
 
 #endif /* Isoburn_includeD */