[x265] [PATCH] slicetype: fix the BRef cost estimates in vbv lookahead

[Steve Borho]

On 02/16, aarthi at multicorewareinc.com wrote:
> # HG changeset patch
> # User Aarthi Thirumalai
> # Date 1424063038 -19800
> #      Mon Feb 16 10:33:58 2015 +0530
> # Node ID b14b95a4565986c9678442dbc510fed974bb413c
> # Parent  164bd8337e72624a7605424cc3bdc67042dd5294
> slicetype: fix the BRef cost estimates in vbv lookahead.

does this belong on stable?

> diff -r 164bd8337e72 -r b14b95a45659 source/encoder/slicetype.cpp
> --- a/source/encoder/slicetype.cpp	Sun Feb 15 20:13:22 2015 -0600
> +++ b/source/encoder/slicetype.cpp	Mon Feb 16 10:33:58 2015 +0530
> @@ -580,7 +580,9 @@
>          curNonB++;
>      int nextNonB = keyframe ? prevNonB : curNonB;
>      int nextB = prevNonB + 1;
> -    int nextBRef = 0;
> +    int nextBRef = 0, curBRef = 0;
> +    if (m_param->bBPyramid && curNonB - prevNonB > 1)
> +        curBRef = (prevNonB + curNonB + 1) / 2;
>      int miniGopEnd = keyframe ? prevNonB : curNonB;
>      while (curNonB < numFrames + !keyframe)
>      {
> @@ -597,7 +599,6 @@
>                  {
>                      frames[j]->plannedSatd[frames[j]->indB] = frames[nextNonB]->plannedSatd[idx];
>                      frames[j]->plannedType[frames[j]->indB++] = frames[nextNonB]->plannedType[idx];
> -                
>                  }
>              }
>              idx++;
> @@ -629,12 +630,12 @@
>  
>              for (int j = nextB; j < miniGopEnd; j++)
>              {
> -                if (nextBRef && i == nextBRef)
> +                if (curBRef && curBRef == i)
>                      break;
>                  if (j >= i && j !=nextBRef)
>                      continue;
>                  frames[j]->plannedSatd[frames[j]->indB] = satdCost;
> -                frames[j]->plannedType[frames[j]->indB++] = X265_TYPE_B;
> +                frames[j]->plannedType[frames[j]->indB++] = type;
>              }
>          }
>          prevNonB = curNonB;
> _______________________________________________
> x265-devel mailing list
> x265-devel at videolan.org
> https://mailman.videolan.org/listinfo/x265-devel

-- 
Steve Borho