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avcodec/scpr: make sure that component value is <= 0x1F for 16 bpc 

Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2017-02-24 12:01:30 +01:00
parent fa3e49568d
commit 178cd50c47
1 changed files with 3 additions and 1 deletions
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4
libavcodec/scpr.c
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@ -58,6 +58,7 @@ typedef struct SCPRContext {
unsigned nbx, nby;
unsigned nbcount;
unsigned *blocks;
unsigned cbits;
int cxshift;
} SCPRContext;
@ -241,7 +242,7 @@ static int decode_unit(SCPRContext *s, PixelModel *pixel, unsigned step, unsigne
}
pixel->total_freq = totfr;
*rval = c;
*rval = c & s->cbits;
return 0;
}
@ -789,6 +790,7 @@ static av_cold int decode_init(AVCodecContext *avctx)
}
s->cxshift = avctx->bits_per_coded_sample == 16 ? 0 : 2;
s->cbits = avctx->bits_per_coded_sample == 16 ? 0x1F : 0xFF;
s->nbx = (avctx->width + 15) / 16;
s->nby = (avctx->height + 15) / 16;
s->nbcount = s->nbx * s->nby;