Fix regression when converting to nv12/nv21.

Patch by Guennadi Liakhovetski,  g D liakhovetski A gmx D de 


git-svn-id: file:///var/local/repositories/mplayer/trunk/libswscale@29464 b3059339-0415-0410-9bf9-f77b7e298cf2

swscale.c

@@ -2759,7 +2759,9 @@ SwsContext *sws_getContext(int srcW, int srcH, enum PixelFormat srcFormat, int d
             || (isGray(dstFormat) && isGray(srcFormat))
             || (isPlanarYUV(srcFormat) && isPlanarYUV(dstFormat)
                 && c->chrDstHSubSample == c->chrSrcHSubSample
-                && c->chrDstVSubSample == c->chrSrcVSubSample))
+                && c->chrDstVSubSample == c->chrSrcVSubSample
+                && dstFormat != PIX_FMT_NV12 && dstFormat != PIX_FMT_NV21
+                && srcFormat != PIX_FMT_NV12 && srcFormat != PIX_FMT_NV21))
         {
             if (isPacked(c->srcFormat))
                 c->swScale= packedCopy;