[FFmpeg-cvslog] avcodec/mpegvideo: Fix edge emu with lowres

[Michael Niedermayer]

ffmpeg | branch: release/1.2 | Michael Niedermayer <michaelni at gmx.at> | Wed May  8 01:18:56 2013 +0200| [3ca6253beb1207d8021d728984c1aefe06dce91a] | committer: Carl Eugen Hoyos

avcodec/mpegvideo: Fix edge emu with lowres

Fixes a few green artifacts at the top
Fixes rest of Ticket 2535

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
(cherry picked from commit c67bca2b5a94efb8fb3c2ba2c7d9b1b413468838)

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=3ca6253beb1207d8021d728984c1aefe06dce91a
---

 libavcodec/mpegvideo.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/mpegvideo.c b/libavcodec/mpegvideo.c
index 92b301d..5da9c98 100644
--- a/libavcodec/mpegvideo.c
+++ b/libavcodec/mpegvideo.c
@@ -2221,7 +2221,7 @@ static av_always_inline void mpeg_motion_lowres(MpegEncContext *s,
     ptr_cb = ref_picture[1] + uvsrc_y * uvlinesize + uvsrc_x;
     ptr_cr = ref_picture[2] + uvsrc_y * uvlinesize + uvsrc_x;
 
-    if ((unsigned) src_x > FFMAX( h_edge_pos - (!!sx) - 2 * block_s,       0) ||
+    if ((unsigned) src_x > FFMAX( h_edge_pos - (!!sx) - 2 * block_s,       0) || uvsrc_y<0 ||
         (unsigned) src_y > FFMAX((v_edge_pos >> field_based) - (!!sy) - h, 0)) {
         s->vdsp.emulated_edge_mc(s->edge_emu_buffer, ptr_y,
                                 linesize >> field_based, 17, 17 + field_based,