[NUT-devel] r22069 - trunk/DOCS/tech/nut.txt

[michael]

Author: michael
Date: Tue Jan 30 01:47:28 2007
New Revision: 22069

Modified:
   trunk/DOCS/tech/nut.txt

Log:
better back_ptr_div16 description by (Clemens Ladisch ((( cladisch ( fastmail (( net


Modified: trunk/DOCS/tech/nut.txt
==============================================================================
--- trunk/DOCS/tech/nut.txt	(original)
+++ trunk/DOCS/tech/nut.txt	Tue Jan 30 01:47:28 2007
@@ -736,10 +736,11 @@
 
 back_ptr_div16 (v)
     back_ptr = back_ptr_div16 * 16 + 15
-    back_ptr must point to a position within 16 bytes of a syncpoint
-    startcode. This syncpoint MUST be the closest syncpoint such that at
-    least one keyframe with a pts lower or equal to the original syncpoint's
-    global_key_pts for all streams lies between it and the current syncpoint.
+    back_ptr must point to a position up to 15 bytes before a syncpoint
+    startcode. Relative to position of current syncpoint. The syncpoint
+    pointed to MUST be the closest syncpoint such that at least one keyframe
+    with a pts lower or equal to the current syncpoint's global_key_pts for
+    all streams lies between it and the current syncpoint.
 
     A stream where EOR is set is to be ignored for back_ptr.