[FFmpeg-devel] [PATCH] lavfi: port 2xsai filter from libmpcodecs

[Stefano Sabatini]

On date Saturday 2012-04-07 23:58:28 +0200, Stefano Sabatini encoded:
> Based on the port by Nielkie <nielkie at gmail.com>, done for GCI 2010.
> Same output as the original filter.
> 
> See thread:
> Subject: [FFmpeg-devel] [PATCH] Port MPlayer 2xSaI filter to libavfilter
> Date: Thu, 25 Nov 2010 01:31:24 +1000
> ---
>  configure                   |    1 +
>  doc/filters.texi            |    7 +
>  libavfilter/Makefile        |    1 +
>  libavfilter/allfilters.c    |    1 +
>  libavfilter/vf_super2xsai.c |  302 +++++++++++++++++++++++++++++++++++++++++++
>  5 files changed, 312 insertions(+), 0 deletions(-)
>  create mode 100644 libavfilter/vf_super2xsai.c

I had to rewrite the port basically from scratch, in order to check
where the Nielkie port was diverging. New variant is as fast as the
original, so I'll remove the libmpcodecs wrapped filter as I'll commit
this one.

[...]
> +        READ_COLOR(color[0][0], src_line[0], 0); color[0][1] = color[0][0]; READ_COLOR(color[0][2], src_line[0], 1); READ_COLOR(color[0][3], src_line[0], 2);
> +        READ_COLOR(color[1][0], src_line[1], 0); color[1][1] = color[1][0]; READ_COLOR(color[1][2], src_line[1], 1); READ_COLOR(color[1][3], src_line[1], 2);
> +        READ_COLOR(color[2][0], src_line[2], 0); color[2][1] = color[2][1]; READ_COLOR(color[2][2], src_line[2], 1); READ_COLOR(color[2][3], src_line[2], 2);
                                                    ^^^^^^^^^^^^^^^^^^^^^^^^^

> +        READ_COLOR(color[3][0], src_line[3], 0); color[3][1] = color[3][0]; READ_COLOR(color[3][2], src_line[3], 1); READ_COLOR(color[3][3], src_line[3], 2);

This looks like an error, but I kept it for maintaining the same output.

[...]
-- 
FFmpeg = Fiendish Fanciful MultiPurpose Ecumenical Ghost