[FFmpeg-devel] [PATCH 03/11] avcodec/snowenc: use log2 instead of log() / log(2...)

[Michael Niedermayer]

On Thu, Oct 29, 2015 at 12:20:01AM -0400, Ganesh Ajjanagadde wrote:
> This is likely more precise and conveys the intent better.
> The expression has also been accordingly simplified.
> 
> Signed-off-by: Ganesh Ajjanagadde <gajjanagadde at gmail.com>
> ---
>  libavcodec/snowenc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/libavcodec/snowenc.c b/libavcodec/snowenc.c
> index 7e8269c..fb0cd3f 100644
> --- a/libavcodec/snowenc.c
> +++ b/libavcodec/snowenc.c
> @@ -1547,7 +1547,7 @@ static void calculate_visual_weight(SnowContext *s, Plane *p){
>                  }
>              }
>  
> -            b->qlog= (int)(log(352256.0/sqrt(error)) / log(pow(2.0, 1.0/QROOT))+0.5);
> +            b->qlog= (int)(QROOT * log2(352256.0/sqrt(error)) + 0.5);

LGTM

thanks

[...]
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Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

While the State exists there can be no freedom; when there is freedom there
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