From: Ronald S. Bultje <rsbultje@gmail.com>
Date: Fri, 4 Nov 2011 19:19:29 +0000 (-0700)
Subject: swscale: align vertical filtersize by 2 on x86.
X-Git-Tag: n0.9~57^2~213
X-Git-Url: http://git.ffmpeg.org/gitweb/ffmpeg.git/commitdiff_plain/1deb08fcb678364f7cb2559d1e3497d1e5568910

swscale: align vertical filtersize by 2 on x86.

The vertical scaler handles 2 rows at a time and thus requires
alignment by 2, or else it'll read invalid memory and result in
corrupt output.
---

diff --git a/libswscale/utils.c b/libswscale/utils.c
index 64ac77d..862b273 100644
--- a/libswscale/utils.c
+++ b/libswscale/utils.c
@@ -962,7 +962,7 @@ int sws_init_context(SwsContext *c, SwsFilter *srcFilter, SwsFilter *dstFilter)
     /* precalculate vertical scaler filter coefficients */
     {
         const int filterAlign=
-            (HAVE_MMX     && cpu_flags & AV_CPU_FLAG_MMX) && (flags & SWS_ACCURATE_RND) ? 2 :
+            (HAVE_MMX     && cpu_flags & AV_CPU_FLAG_MMX) ? 2 :
             (HAVE_ALTIVEC && cpu_flags & AV_CPU_FLAG_ALTIVEC) ? 8 :
             1;