commit a06e05982d8c781626c09d5d9fc41af8c9c5bb2a
author Jingning Han <jingning@google.com> Tue Jan 09 10:01:40 2018 -0800
committer Jingning Han <jingning@google.com> Tue Jan 09 22:52:53 2018 +0000
tree 9300fd0c7491012779b95a5b17918343ceba9bf4
parent 70f61b22cac3c7db0e8154385b6a21e7a87fd836

Skip scaled reference frame for motion vector projection

When the reference frame size differs from the current coding
frame, skip the use of its motion information for motion field
estimation.

BUG=aomedia:1194

Change-Id: I1a32395367228f4ac86a21099b6b7b2c25e60270

av1/common/mvref_common.c

diff --git a/av1/common/mvref_common.c b/av1/common/mvref_common.c
index 1c7a407..129b6e8 100644
--- a/av1/common/mvref_common.c
+++ b/av1/common/mvref_common.c
@@ -1455,6 +1455,10 @@
   int ref_frame_idx = cm->frame_refs[FWD_RF_OFFSET(ref_frame)].idx;
   if (ref_frame_idx < 0) return 0;
 
+  if (cm->buffer_pool->frame_bufs[ref_frame_idx].mi_rows != cm->mi_rows ||
+      cm->buffer_pool->frame_bufs[ref_frame_idx].mi_cols != cm->mi_cols)
+    return 0;
+
   int ref_frame_index =
       cm->buffer_pool->frame_bufs[ref_frame_idx].cur_frame_offset;
   int cur_frame_index = cm->cur_frame->cur_frame_offset;