[FFmpeg-devel] [PATCH 1/3] avcodec/screenpresso: Optimize sum_delta_flipped()

Paul B Mahol onemda at gmail.com
Thu Jan 30 10:22:53 EET 2020


lgtm

On 1/29/20, Michael Niedermayer <michael at niedermayer.cc> wrote:
> 553 -> 332 sec
>
> Testcase:
> 20280/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SCREENPRESSO_fuzzer-6238663432470528
>
> Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> ---
>  libavcodec/screenpresso.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/libavcodec/screenpresso.c b/libavcodec/screenpresso.c
> index 5fac100897..d73c24df83 100644
> --- a/libavcodec/screenpresso.c
> +++ b/libavcodec/screenpresso.c
> @@ -94,8 +94,9 @@ static void sum_delta_flipped(uint8_t       *dst, int
> dst_linesize,
>  {
>      int i;
>      for (; height > 0; height--) {
> +        const uint8_t *src1 = &src[(height - 1) * src_linesize];
>          for (i = 0; i < bytewidth; i++)
> -            dst[i] += src[(height - 1) * src_linesize + i];
> +            dst[i] += src1[i];
>          dst += dst_linesize;
>      }
>  }
> --
> 2.17.1
>
> _______________________________________________
> ffmpeg-devel mailing list
> ffmpeg-devel at ffmpeg.org
> https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
>
> To unsubscribe, visit link above, or email
> ffmpeg-devel-request at ffmpeg.org with subject "unsubscribe".


More information about the ffmpeg-devel mailing list