avfilter/vf_signalstats: Use 64bit for processing histogram
The result might not fit into 32bit if an image has gigantic dimensions and one of the planes has a dominant value (particularly so if said value is big). Fixes Coverity issues #1598399, #1598401, #1598402, #1598403, #1598404. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
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@ -721,10 +721,10 @@ static int filter_frame(AVFilterLink *link, AVFrame *in)
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if (histv[fil]) maxv = fil;
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if (histsat[fil]) maxsat = fil;
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toty += histy[fil] * fil;
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totu += histu[fil] * fil;
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totv += histv[fil] * fil;
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totsat += histsat[fil] * fil;
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toty += (uint64_t)histy[fil] * fil;
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totu += (uint64_t)histu[fil] * fil;
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totv += (uint64_t)histv[fil] * fil;
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totsat += (uint64_t)histsat[fil] * fil;
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accy += histy[fil];
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accu += histu[fil];
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@ -745,7 +745,7 @@ static int filter_frame(AVFilterLink *link, AVFrame *in)
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maxhue = histhue[0];
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medhue = -1;
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for (fil = 0; fil < 360; fil++) {
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tothue += histhue[fil] * fil;
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tothue += (uint64_t)histhue[fil] * fil;
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acchue += histhue[fil];
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if (medhue == -1 && acchue > s->cfs / 2)
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