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sws: fix extreem downscaling

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-10-27 16:26:39 +02:00
parent 95760b33e7
commit 7de2196029
1 changed files with 2 additions and 2 deletions
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4
libswscale/utils.c
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@ -230,7 +230,7 @@ static int initFilter(int16_t **outFilter, int32_t **filterPos,
int minFilterSize; int minFilterSize;
int64_t *filter = NULL; int64_t *filter = NULL;
int64_t *filter2 = NULL; int64_t *filter2 = NULL;
const int64_t fone = 1LL << 54; const int64_t fone = 1LL << (54 - FFMIN(av_log2(srcW/dstW), 8));
int ret = -1; int ret = -1;
emms_c(); // FIXME should not be required but IS (even for non-MMX versions) emms_c(); // FIXME should not be required but IS (even for non-MMX versions)
@ -356,7 +356,7 @@ static int initFilter(int16_t **outFilter, int32_t **filterPos,
(-12 * B - 48 * C) * d + (-12 * B - 48 * C) * d +
(8 * B + 24 * C) * (1 << 30); (8 * B + 24 * C) * (1 << 30);
} }
coeff *= fone >> (30 + 24); coeff /= (1LL<<54)/fone;
} }
#if 0 #if 0
else if (flags & SWS_X) { else if (flags & SWS_X) {