[x265] [PATCH] motion: skip the ME search if any of MVC sad cost is zero

[Deepthi Nandakumar]

This crashes on 3 of the first 5 commandlines in the smoke test.

On Fri, Jun 26, 2015 at 10:57 AM, <gopu at multicorewareinc.com> wrote:

> # HG changeset patch
> # User Gopu Govindaswamy <gopu at multicorewareinc.com>
> # Date 1435296461 -19800
> #      Fri Jun 26 10:57:41 2015 +0530
> # Node ID 6d7b0c5585cc6498ef40ddcf4a0d3c241892d5bf
> # Parent  09193c05af52b2024635037dbf9fa19d4b978e4b
> motion: skip the ME search if any of MVC sad cost is zero
>
> diff -r 09193c05af52 -r 6d7b0c5585cc source/encoder/motion.cpp
> --- a/source/encoder/motion.cpp Fri Jun 26 10:16:29 2015 +0530
> +++ b/source/encoder/motion.cpp Fri Jun 26 10:57:41 2015 +0530
> @@ -646,7 +646,15 @@
>          MV m = mvc[i].clipped(qmvmin, qmvmax);
>          if (m.notZero() && m != pmv && m != bestpre) // check already
> measured
>          {
> -            int cost = subpelCompare(ref, m, sad) + mvcost(m);
> +            int cost = subpelCompare(ref, m, sad);
> +            // skip ME Search if any of MVC sad cost is zero
> +            if (!cost)
> +            {
> +                outQMv = m;
> +                return mvcost(m);
> +            }
> +            else
> +                cost += mvcost(m);
>              if (cost < bprecost)
>              {
>                  bprecost = cost;
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