avfilter/vf_xbr: Fix left shift of negative number

Affected every usage of vf_xbr, e.g. the FATE-tests filter-2xbr,
filter-3xbr, filter-4xbr.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

diff --git a/libavfilter/vf_xbr.c b/libavfilter/vf_xbr.c
index 2c71871d22db45ee31369d132bbee062d45768bf..87810c88f13537f45d9b4e76a2c2c8b408f118ec 100644 (file)
--- a/libavfilter/vf_xbr.c
+++ b/libavfilter/vf_xbr.c
@@ -395,7 +395,7 @@ static int init(AVFilterContext *ctx)
             int startg = FFMAX3(-bg, -rg, 0);
             int endg = FFMIN3(255-bg, 255-rg, 255);
             uint32_t y = (uint32_t)(( 299*rg + 1000*startg + 114*bg)/1000);
-            c = bg + (rg<<16) + 0x010101 * startg;
+            c = bg + rg * (1 << 16) + 0x010101 * startg;
             for (g = startg; g <= endg; g++) {
                 s->rgbtoyuv[c] = ((y++) << 16) + (u << 8) + v;
                 c+= 0x010101;