Fix HMAC sequence count on MXF read.

This fixes #4.

diff --git a/src/AS_DCP_internal.h b/src/AS_DCP_internal.h
index 83272c09b431a8861ab0a0355abc0172d186d961..57ed006a04dffcee8351ae8362d489e2603a6ba3 100755 (executable)
--- a/src/AS_DCP_internal.h
+++ b/src/AS_DCP_internal.h
@@ -414,17 +414,23 @@ namespace ASDCP
          // Count the sequence length in because this is the sequence
          // value needed to  complete the HMAC.
          ASDCP::MXF::RIP::const_pair_iterator i;
-         for ( i = m_RIP.PairArray.begin(); i != m_RIP.PairArray.end(); ++i, ++sequence )
+         for ( i = m_RIP.PairArray.begin(); i != m_RIP.PairArray.end(); ++i)
            {
-             if ( sid == i->BodySID )
-               {
-                 start_offset = i->ByteOffset;
-               }
-             else if ( start_offset != 0 )
-               {
-                 end_offset = i->ByteOffset;
-                 break;
-               }
+              if ( sid == i->BodySID )
+                {
+                  assert( start_offset == 0);
+                  start_offset = i->ByteOffset;
+                }
+              else if ( start_offset != 0 )
+                {
+                  end_offset = i->ByteOffset;
+                  break;
+                }
+
+              if ( i->BodySID > 0 )
+                {
+                  ++sequence;
+                }
            }
 
          if ( start_offset == 0 || end_offset == 0 )