shithub: libvpx

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Use zero motion vector in choose_partitioning

The zero motion vector was effectively used in the subsampled pixel
based variance calculation. This commit makes it directly use zero
mv to generate prediction.

Change-Id: Ica83dc843e9f8da2f89c3ef451e50f16214c0def

--- a/vp9/encoder/vp9_encodeframe.c

+++ b/vp9/encoder/vp9_encodeframe.c

@@ -467,7 +467,6 @@

   int sp;

   int dp;

   int pixels_wide = 64, pixels_high = 64;

-  int_mv nearest_mv, near_mv;

   const YV12_BUFFER_CONFIG *yv12 = get_ref_frame_buffer(cpi, LAST_FRAME);

   const struct scale_factors *const sf = &cm->frame_refs[LAST_FRAME - 1].sf;

@@ -488,11 +487,7 @@

     xd->mi[0].src_mi->mbmi.ref_frame[0] = LAST_FRAME;

     xd->mi[0].src_mi->mbmi.sb_type = BLOCK_64X64;

-    vp9_find_best_ref_mvs(xd, cm->allow_high_precision_mv,

-                          xd->mi[0].src_mi->mbmi.ref_mvs[LAST_FRAME],

-                          &nearest_mv, &near_mv);

-

-    xd->mi[0].src_mi->mbmi.mv[0] = nearest_mv;

+    xd->mi[0].src_mi->mbmi.mv[0].as_int = 0;

     vp9_build_inter_predictors_sby(xd, mi_row, mi_col, BLOCK_64X64);

     d = xd->plane[0].dst.buf;