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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>
This commit is contained in:
Andreas Rheinhardt 2019-09-28 04:25:56 +02:00 committed by Michael Niedermayer
parent fa21194326
commit 4294dc3589
1 changed files with 1 additions and 1 deletions
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2
libavfilter/vf_xbr.c
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@ -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;