[FFmpeg-user] Rewriting 'fieldmatch' using the State Machine Method

[Andrew Randrianasulu]

ср, 11 июн. 2025 г., 21:30 Mark Filipak <
markfilipak.imdb-at-gmail.com at ffmpeg.org>:

> On 11/06/2025 12.15, Carl Zwanzig wrote:
> > On 6/10/2025 6:45 PM, Mark Filipak wrote:
> >> Now, you can discount what I write, but you can't discount that you
> code by trial and error. It's
> >> up to you.
> >
> > Everyone "codes" by trial and error and a part of that process is also
> known as "debugging" - almost
> > nothing more complicated than "Hello world" fully works correctly the
> first time, if it does that's
> > a happy accident. It also often means the programmer has overlooked
> something.
>
> I'm willing to make a big commitment. I will rewrite 'fieldmatch' but I
> will need help with 'C'.
> I've programmed in 14 languages. Most were assembly. None was 'C'.
>
> Of course I know the syntax. I may not need much help. I have two, thick
> 'C' primers but they gloss
> over exactly the topics I can't figure out. Almost all my friends in
> California were 'C' codesmiths.
> I would ask them straightforward questions, "What does this arrow mean?"
> They said, "That's a
> pointer." They thought I should know what that means -- no explanation.
> They'd say, "You program in
> assembly, you know base register and indexing. That's what the arrow
> means." Huh? Of course I know
> base register and indexing. What's that got to do with an arrow? No
> explanation.
>

Note, I am not a programmer.

if you mean construction like

avctx->something this is pointer (memory address) of one of members of
previously defined (keyword  "struct") data structure. Data structures are
powerful because you can group few related variables of different types
(unlike, say, arrays).

You do not use absolute (numerical) addresses in C, compiler convert your
symbolic names ("avctx", "something") into memory access to
auto-determinated memory location.




> My friends, my books, no examples. I gave up.
>
> If anyone wants to help with the 'C', I will develop all 116 cases and do
> the coding myself. Believe
> me, it will be an eye opening experience for both of us. I wrote that the
> codesmiths who worked for
> me said they'd never seen that type of software architecture, state
> machine architecture. I didn't
> lie. I wrote that they were amazed. I didn't lie.
>
> The point I was trying to make regarding hardware is that hardware must be
> provably correct -- you
> can't rework hardware once a $million has been spent fabbing a chip. The
> principles can be applied
> to software. I know that because my 'C' codesmiths did it.
>
> --Mark.
>
>
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