[FFmpeg-devel] [PATCH V7 1/2] libswscale/x86/yuv2rgb: Change inline assembly into nasm code

[Fu, Ting]

> -----Original Message-----
> From: ffmpeg-devel <ffmpeg-devel-bounces at ffmpeg.org> On Behalf Of Ronald
> S. Bultje
> Sent: Sunday, January 19, 2020 10:55 PM
> To: FFmpeg development discussions and patches <ffmpeg-devel at ffmpeg.org>
> Subject: Re: [FFmpeg-devel] [PATCH V7 1/2] libswscale/x86/yuv2rgb: Change
> inline assembly into nasm code
> 
> Hi,
> 
> On Sat, Jan 18, 2020 at 9:49 PM Fu, Ting <ting.fu at intel.com> wrote:
> 
> > Since NASM function will get only the address of SwsConext c ( in
> > order to be compatible with yuv2rgb_c function in parameters), not the
> > address of
> > c->redDither nor the c->dstW. I have no way to get the value of
> > c->c->dstW by
> > using address offset.
> 
> 
> Nasm and related variants have "struc" (like "struct" in C) for this.
Hi Ronald,

Thank you so much for the information. I believe it will be helpful in future patches.

Thank you,
Ting Fu
> 
> See for example this code:
> https://code.videolan.org/videolan/dav1d/blob/master/src/x86/film_grain.asm
> #L64
> 
> Hope this helps,
> Ronald
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