[FFmpeg-cvslog] avcodec/vc1: fix calculation of the last line of a slice

[Jerome Borsboom]

ffmpeg | branch: master | Jerome Borsboom <jerome.borsboom at carpalis.nl> | Fri May 18 17:06:32 2018 +0200| [2b86472a65b7fe48f8467b669462b7972cc2f1ae] | committer: Michael Niedermayer

avcodec/vc1: fix calculation of the last line of a slice

Only for the last slice of the first field is the last line of the slice
equal to the height of the field.

Signed-off-by: Jerome Borsboom <jerome.borsboom at carpalis.nl>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=2b86472a65b7fe48f8467b669462b7972cc2f1ae
---

 libavcodec/vc1dec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/vc1dec.c b/libavcodec/vc1dec.c
index 40a3e501dd..4f7b20a4a4 100644
--- a/libavcodec/vc1dec.c
+++ b/libavcodec/vc1dec.c
@@ -1029,7 +1029,7 @@ static int vc1_decode_frame(AVCodecContext *avctx, void *data,
                     av_log(v->s.avctx, AV_LOG_ERROR, "first field slice count too large\n");
                     continue;
                 }
-                s->end_mb_y = (i <= n_slices1 + 1) ? mb_height : FFMIN(mb_height, slices[i].mby_start % mb_height);
+                s->end_mb_y = (i == n_slices1 + 1) ? mb_height : FFMIN(mb_height, slices[i].mby_start % mb_height);
             }
             if (s->end_mb_y <= s->start_mb_y) {
                 av_log(v->s.avctx, AV_LOG_ERROR, "end mb y %d %d invalid\n", s->end_mb_y, s->start_mb_y);