[mpeg2-cvs] CVS: mpeg2dec/libmpeg2 slice.c,1.1.1.1,1.2

[Michel L. <wa...@us...>]

Update of /cvsroot/libmpeg2/mpeg2dec/libmpeg2
In directory usw-pr-cvs1:/tmp/cvs-serv22478/libmpeg2

Modified Files:
	slice.c 
Log Message:
added support for an unusual construct at the start of some
slices. With this new code libmpeg2's behaviour should be equivalent
to that of decoders that have the notion of macroblock addresses. The
speed impact should not be measurable as this is outside of the
macroblock loop.

Also checking that the macroblock position is within the bounds of the
image probably helps with robustness.



Index: slice.c
===================================================================
RCS file: /cvsroot/libmpeg2/mpeg2dec/libmpeg2/slice.c,v
retrieving revision 1.1.1.1
retrieving revision 1.2
diff -u -d -r1.1.1.1 -r1.2
--- slice.c	2001/07/19 08:21:13	1.1.1.1
+++ slice.c	2001/09/03 10:46:51	1.2
@@ -1590,6 +1590,19 @@
     GET_MACROBLOCK_ADDRESS_INCREMENT (offset);
     offset <<= 4;
 
+    while (offset - picture->coded_picture_width >= 0) {
+	offset -= picture->coded_picture_width;
+	if ((picture->current_frame->copy == NULL) ||
+	    (picture->picture_coding_type != B_TYPE)) {
+	    dest[0] += 16 * stride;
+	    dest[1] += 4 * stride;
+	    dest[2] += 4 * stride;
+	}
+	picture->v_offset += 16;
+    }
+    if (picture->v_offset >= picture->coded_picture_height)
+	return;
+
     while (1) {
 	int mba_inc;