Re: to be effcient or not to be efficient

----- Original Message -----
From: Steve Lhomme <[email protected]>
Date: Wed, 07 Jan 2004 19:44:01 +0100
To: "The attempt to create a new,  open standard codec API" <[email protected]>
Subject: Re: [Media-api] to be effcient or not to be efficient

> Attila Kinali wrote:
> 
> >>Consider this :
> >>struct _blah {
> >>	uint16 Size;
> >>	uint8  FieldA;
> >>	uint32 FieldB;
> >>	char   FieldC[30];
> >>};
> >>
> >>Now (after a few years) you realise that you need FieldA to be on 2 
> >>octets instead of 1. You simply can't. And you can with EBML.
> > 
> > 
> > Yes, but you can foretell whether there could be a need to extend
> > a field as you already know what kind of information is available.
> > Beside, i would consider a new version of the API if such a change
> > is needed.
> 
> So what happens to the older apps ?
> 

This is why I did my design the way I did. Since all the old messages are still there they all work fine, just as they did before.

> >>OK, so what would you use ? The output pulls the data (no lock needed) ? 
> >>The input pushes the data (lock needed while data are not needed yet) ? 
> >>How is seeking handled ? When you're in the middle of decoding an I 
> >>frame for example ?
> > 
> > 
> > Can't say. I know mplayer G1 and vlc use a push system while
> > mplayer G2 will use a pull system (Rich/Arpi said that there are
> > some problems with push systems that can be circumvented with pull
> > systems), but i lack to much experience to decide this.
> 
> I read MPlayer G2 vp. Actually there is push/pull/in-place processing... 
> I hope you don't have to implement all of them for each filter :/
> 

This was another one of the reasons I wanted this system. I don't like the idea of having a whole mess of functions and making every single codec, filter, etc implement ALL of them, even if it's just a return "I don't support this" function. It's irritating and unnecessary, and anytime you add something you break them all. I want to avoid that.


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