vd_ffmpeg: fix MP_IMGTYPE selection for non-ref non-B frames
Change direct rendering buffer allocation code to treat non-ref frames
like B-frames even if has_b_frames is not set and they are indeed not
B-frames (no reordering). Treating it as an I/P frame would violate
the assumptions of MPlayer's buffering system, which thinks only the
latest previous I/P frame is needed (in addition to one possibly being
decoded). In this case the previous I/P frame will still be needed in
the future, not the non-ref frame being decoded now.
This happens with flv files, as in bug #1079, and this change fixes that
corruption.
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@32700 b3059339-0415-0410-9bf9-f77b7e298cf2