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sws: print a warning on unaligned input on SSE2+ 

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2011-10-31 01:36:02 +01:00
parent fbf4b390d0
commit f44ad92c3f
1 changed files with 12 additions and 0 deletions
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12
libswscale/swscale.c
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@ -2539,6 +2539,18 @@ static int swScale(SwsContext *c, const uint8_t* src[],
}
}
if ((int)dst[0]%16 || (int)dst[1]%16 || (int)dst[2]%16 || (int)src[0]%16 || (int)src[1]%16 || (int)src[2]%16
|| dstStride[0]%16 || dstStride[1]%16 || dstStride[2]%16 || dstStride[3]%16
|| srcStride[0]%16 || srcStride[1]%16 || srcStride[2]%16 || srcStride[3]%16
) {
static int warnedAlready=0;
int cpu_flags = av_get_cpu_flags();
if (HAVE_MMX2 && (cpu_flags & AV_CPU_FLAG_SSE2) && !warnedAlready){
av_log(c, AV_LOG_WARNING, "Warning: data is not aligned! This can lead to a speedloss\n");
warnedAlready=1;
}
}
/* Note the user might start scaling the picture in the middle so this
will not get executed. This is not really intended but works
currently, so people might do it. */