On Fri, May 27, 2011 at 11:54:12AM -0400, Ronald S. Bultje wrote:
> That means it won't be allocated when not needed. Alongside
> this, it may fix valgrind/fate-detected memory leaks.
> ---
>  libswscale/utils.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/libswscale/utils.c b/libswscale/utils.c
> index 15ed9d1..571f45b 100644
> --- a/libswscale/utils.c
> +++ b/libswscale/utils.c
> @@ -791,7 +791,6 @@ int sws_init_context(SwsContext *c, SwsFilter *srcFilter, 
> SwsFilter *dstFilter)
>                 srcW, srcH, dstW, dstH);
>          return AVERROR(EINVAL);
>      }
> -    FF_ALLOC_OR_GOTO(c, c->formatConvBuffer, FFALIGN(srcW, 16) * 2, fail);
>  
>      if (!dstFilter) dstFilter= &dummyFilter;
>      if (!srcFilter) srcFilter= &dummyFilter;
> @@ -847,6 +846,7 @@ int sws_init_context(SwsContext *c, SwsFilter *srcFilter, 
> SwsFilter *dstFilter)
>          }
>      }
>  
> +    FF_ALLOC_OR_GOTO(c, c->formatConvBuffer, FFALIGN(srcW, 16) * 2, fail);
>      if (HAVE_MMX2 && cpu_flags & AV_CPU_FLAG_MMX2) {
>          c->canMMX2BeUsed= (dstW >=srcW && (dstW&31)==0 && (srcW&15)==0) ? 1 
> : 0;
>          if (!c->canMMX2BeUsed && dstW >=srcW && (srcW&15)==0 && 
> (flags&SWS_FAST_BILINEAR)) {

Why not try it under valgrind (they you won't have to write "may fix")?
Trying to scale 4x4 input should trigger the condition (I think).
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