From 7de21960292c15e544807f09d1bfc9935a88e5ce Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Sat, 27 Oct 2012 16:26:39 +0200 Subject: [PATCH] sws: fix extreem downscaling Signed-off-by: Michael Niedermayer --- libswscale/utils.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/libswscale/utils.c b/libswscale/utils.c index 81da98d651..2fa1c13ba6 100644 --- a/libswscale/utils.c +++ b/libswscale/utils.c @@ -230,7 +230,7 @@ static int initFilter(int16_t **outFilter, int32_t **filterPos, int minFilterSize; int64_t *filter = 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; 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 + (8 * B + 24 * C) * (1 << 30); } - coeff *= fone >> (30 + 24); + coeff /= (1LL<<54)/fone; } #if 0 else if (flags & SWS_X) {