[FFmpeg-devel] Re: [Question] Learning about VVC and wasm

[Frank Plowman via ffmpeg-devel <ffmpeg-devel@ffmpeg.org>]

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On 13/11/2025 17:56, Sidd via ffmpeg-devel wrote:
> Hi Frank,
> 
> Thanks for the reply, it seems like there is a lot for me to cover.
> 
> Regarding the assembly, since FFmpeg is known for handcrafting it, are
> there any references of help in their docs regarding this? I have gone
> through their ASM lessons and know the basics of them but am quite far
> from being good at writing it. And if I may ask, what exactly are the
> current drawbacks of the current C implementation?
> 
> Thank you for taking your time to answer my questions.
> 

The assembly lessons are the only "intro to SIMD" resource specifically
for FFmpeg that I know of, but I'm sure you can find more stuff by
googling.  A more practical resource for x86 specifically is [1] on
x86inc.asm.  I think the most important thing is to practice.  Yes, the
learning curve is steep.  I can't say I'm very good at writing SIMD.

I'm not quite sure what you mean by "drawbacks of the current C
implementation" -- as opposed to what?  As I said, the C high-level
decoder logic is in a good state, but the decoder is quite slow and
needs more ASM to make it faster.

Nit: top-posting is discouraged on mailing lists such as ffmpeg-devel.

[1]
https://blogs.gnome.org/rbultje/2017/07/14/writing-x86-simd-using-x86inc-asm/

-- 
All the best,
Frank

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