tree 3a43bcf917f48700739648aa973dc801a52a7a8e
parent 1d7d4d4e8e171db7340bc7fe86c37452e58bef47
author Yue Chen <yuec@google.com> 1555027630 -0700
committer Yue Chen <yuec@google.com> 1555466879 +0000

Set up explicit reference frame maps in GF_GROUP

- Add two arrays ref_frame_disp_idx and ref_frame_gop_idx, holding
gop indices and display order indices of reference frames of frames
in the current gop.
- Rename 'frame_gop_index' as 'frame_disp_idx' because the values
are indices in display order
- If a reference frame, other than the golden frame, is not in the
current gop, the index is set as -1
- TODO: need to figure out how to handle (1) S frame (2) no show
key frame (3) error resilient mode (4) INTNL_OVERLAY_UPDATE frame
with show_existing_frame off.

Change-Id: Ica311c800052784acc8f3aa70405ab66ee7e8ece