[FFmpeg-cvslog] avcodec/vc1_mc: Simplify v_edge_pos and src_y correction when fieldmv is true

zhaoxiu.zeng git at videolan.org
Sat Mar 7 21:18:28 CET 2015


ffmpeg | branch: master | zhaoxiu.zeng <zhaoxiu.zeng at gmail.com> | Sat Mar  7 22:45:36 2015 +0800| [468defc57b47dece90f8ad2072529e26ba581fa6] | committer: Michael Niedermayer

avcodec/vc1_mc: Simplify v_edge_pos and src_y correction when fieldmv is true

Signed-off-by: Zeng Zhaoxiu <zhaoxiu.zeng at gmail.com>
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=468defc57b47dece90f8ad2072529e26ba581fa6
---

 libavcodec/vc1_mc.c |   21 ++++++++++++---------
 1 file changed, 12 insertions(+), 9 deletions(-)

diff --git a/libavcodec/vc1_mc.c b/libavcodec/vc1_mc.c
index 18324c0..4b7f8b6 100644
--- a/libavcodec/vc1_mc.c
+++ b/libavcodec/vc1_mc.c
@@ -416,10 +416,12 @@ void ff_vc1_mc_4mv_luma(VC1Context *v, int n, int dir, int avg)
     if (v->field_mode && v->ref_field_type[dir])
         srcY += s->current_picture_ptr->f->linesize[0];
 
-    if (fieldmv && !(src_y & 1))
-        v_edge_pos--;
-    if (fieldmv && (src_y & 1) && src_y < 4)
-        src_y--;
+    if (fieldmv) {
+        if (!(src_y & 1))
+            v_edge_pos--;
+        else
+            src_y -= (src_y < 4);
+    }
     if (v->rangeredfrm || use_ic
         || s->h_edge_pos < 13 || v_edge_pos < 23
         || (unsigned)(src_x - s->mspel) > s->h_edge_pos - (mx & 3) - 8 - s->mspel * 2
@@ -722,11 +724,12 @@ void ff_vc1_mc_4mv_chroma4(VC1Context *v, int dir, int dir2, int avg)
         uvmx_field[i] = (uvmx_field[i] & 3) << 1;
         uvmy_field[i] = (uvmy_field[i] & 3) << 1;
 
-        if (fieldmv && !(uvsrc_y & 1))
-            v_edge_pos = (s->v_edge_pos >> 1) - 1;
-
-        if (fieldmv && (uvsrc_y & 1) && uvsrc_y < 2)
-            uvsrc_y--;
+        if (fieldmv) {
+            if (!(uvsrc_y & 1))
+                v_edge_pos = (s->v_edge_pos >> 1) - 1;
+            else
+                uvsrc_y -= (uvsrc_y < 2);
+        }
         if (use_ic
             || s->h_edge_pos < 10 || v_edge_pos < (5 << fieldmv)
             || (unsigned)uvsrc_x > (s->h_edge_pos >> 1) - 5



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