[LAD] [ANN] LV2 beta3

Steve Harris steve at plugin.org.uk
Fri May 11 19:26:50 UTC 2007

On 11 May 2007, at 16:56, Fons Adriaensen wrote:
> A second reason would be that using different init() and run()  
> functions,
> not in function of user-level functionality but just to support  
> some types
> of algorithm complicates a host for no good reason. OTOH the extra  
> data
> required to support multi-channel, multi-rate and block-oriented algos
> is minimal, it doesn't complicate a host or get in the way of  
> anything,
> and can be simply be ignored if you don't need it.

I don't support the idea of adding multirate (in the resampling  
sense) support to LV2, I think it can be handled better by other APIs.

Multi-channel is non issue as far as I can see.

Block oriented needs some thought and experimentation, but the  
existing extension seems fine to me, as a first cut. Experience will  
show whether its sufficient and appropriate to the problem. I'll note  
that there already several block-based LADSPA plugins, where LADSPA  
has zero support for these features, you have to suffer compromises,  
its ugly, and they don't work in the general case, just common case,  
but it is possible.

> Thirdly, since it seems already impossible to explain this to the core
> designers, I won't hold my breath until some host developers  
> understand
> why some simple things are necessary, and implement them. It will not
> happen. Which means that I can't write the plugins I'd want to write
> because no host will support them. And if I have to write both the  
> host
> and the plugins, I could as well use any other API that does the job.

There's necessary in order to not make things any worse than the  
status quo, and there's necessary to implement some hypothetical  
plugins that don't yet exist.

Entering into a "jam tomorrow" discussion of everyone's pet features  
is at best fraught and at worst fatal to the process. You might think  
that there are only 3 things missing, but so does everyone else, and  
they wont be the same 3 things. After a while you have GMPI over- 
specification hell.

LV2 offers several useful features out of the box that LADSPA  
doesn't*, and it's long overdue, so I think any suggestion that it  
would be a bad thing to standardise it asis, is nonsense. When we  
have experience of, and consensus on things such as block-based  
processing we can produce a 1.1 spec that mandates them.

* fixing the nasty UID issue, port symbols and port connected-ness  
spring to mind.

- Steve

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