Support functions and changes to default reference list creation for PAFF.

patch by Jeff Downs, heydowns a borg d com
original thread:
Subject: [FFmpeg-devel] [PATCH] Implement PAFF in H.264
Date: 18/09/07 20:30



git-svn-id: file:///var/local/repositories/ffmpeg/trunk@10669 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b