[FFmpeg-devel] [PATCH v2] libswscale: Extend the unaccelerated path of the unscaled yuv2rgb special converter with support for rgb444 output format

[Michael Niedermayer]

On Wed, Mar 03, 2010 at 01:48:55PM +0100, Janusz Krzysztofik wrote:
> In order to play video on a 12-bit display, like OMAP1 frambuffer with 12-bit 
> LCD controller that my Amstrad Delta videophone is equipped with, one or more 
> libswscale converters with rgb444 output pixel format support are required. 
> This patch adds such support to the unaccelerated path of the unscaled yuv2rgb 
> special converter.
> 
> Created and tested against ffmpeg svn revision 22167, on top of
> 	[PATCH v2] Add initial support for 12-bit color mode.
> 
> Tested on Amstrad Delta with 24bpp IJPG and MP43 sourcers using patched 
> mplayer video output drivers.
> 
> Signed-off-by: Janusz Krzysztofik <jkrzyszt at tis.icnet.pl>
> 
> ---
> Changes since v1:
> - do not add info on global rgb12 output format support yet,
> - add support for dithering.
> 
> Michael,
> You were right. It looks better with dithering. Thanks for your hints.

:)


[...]
> @@ -351,6 +352,32 @@ CLOSEYUV2RGBFUNC(8)
>  #endif
>  
>  // r, g, b, dst_1, dst_2
> +YUV2RGBFUNC(yuv2rgb_c_12_dither, uint16_t, 0)
> +    const uint8_t *d16 = dither_8x8_16[y&7];

&3 and cutting the table size down by 2 should result in the identical
output

i think the patch should be ok after this

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Into a blind darkness they enter who follow after the Ignorance,
they as if into a greater darkness enter who devote themselves
to the Knowledge alone. -- Isha Upanishad
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