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avcodec/pixlet: avoid some overflows

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Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2016-12-24 10:26:27 +01:00
parent 43cd33be16
commit ab31b46b89
1 changed files with 2 additions and 2 deletions
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4
libavcodec/pixlet.c
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@ -246,7 +246,7 @@ static int read_high_coeffs(AVCodecContext *avctx, uint8_t *src, int16_t *dst, i
value = 0;
} else {
xflag &= 1u;
tmp = c * ((yflag + 1) >> 1) + (c >> 1);
tmp = (int64_t)c * ((yflag + 1) >> 1) + (c >> 1);
value = xflag + (tmp ^ -xflag);
}
@ -256,7 +256,7 @@ static int read_high_coeffs(AVCodecContext *avctx, uint8_t *src, int16_t *dst, i
j = 0;
dst += stride;
}
state += d * yflag - (d * state >> 8);
state += (int64_t)d * yflag - (d * state >> 8);
flag = 0;