Re: [LAU] Questions about LV2

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To: Julien Claassen <julien@...>
Cc: linux-audio-user <linux-audio-user@...>, David Robillard <d@...>
Date: Tuesday, May 14, 2013 - 9:31 pm

Am 14.05.2013 19:50, schrieb Julien Claassen:

Hi Julien

Don't blindly believe what J.Liles tells here (SCNR)
Mostly the assumptions are wrong. The LV2 specs didn't provide a
communication directly from the custom plugin UI to the dsp part of the
plug! What the LV2 specs provide is a messages system over the host. So
UI's communicate with the dsp engine over the host, it's a message
system. There is no direct access from UI to dsp.
The question here is "Did the host understand the message, and could he
provide a 'interface' to handle it?
Like a E-mail provider, you didn't need to understand the message to
provide it. The same is true for the message system from UI to Host to
plugin engine (dsp)
So the question here is, did the plug provide enough information, in
form of mete data, to the host, so that the host can provide his own
interface to handle the message (in your case a cli interface, clearly)
and is the host able to read and interpret the meta data to do the right
thing with it.
One of the culprits of the LV2 specs are the "IT IS NO FIXED IN SPECS",
so it will ever come to new messages which a host wouldn't understand
and the impression of a 'magical communication between UI and dsp' will
come up, but that is only a sign for the "IT IS NO FIXED IN SPECS", it
could just be to new that the host understand it, but it works ( well
sorry, for you it wouldn't in that case, but as soon the host understand
and support it, it will work for you as well)
This way open a bunch for developers to create plugs which wasn't
possible with any other spec before.

greets
hermann

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Messages in current thread:
[LAU] Questions about LV2, Julien Claassen, (Tue May 14, 9:35 am)
Re: [LAU] Questions about LV2, Jeremy Jongepier, (Tue May 14, 9:42 am)
Re: [LAU] Questions about LV2, Julien Claassen, (Tue May 14, 10:05 am)
Re: [LAU] Questions about LV2, Florian Paul Schmidt, (Tue May 14, 10:15 am)
Re: [LAU] Questions about LV2, Julien Claassen, (Tue May 14, 10:27 am)
Re: [LAU] Questions about LV2, J. Liles, (Tue May 14, 5:37 pm)
Re: [LAU] Questions about LV2, Paul Davis, (Wed May 15, 9:16 am)
Re: [LAU] Questions about LV2, J. Liles, (Wed May 15, 5:27 pm)
Re: [LAU] Questions about LV2, Julien Claassen, (Tue May 14, 5:51 pm)
Re: [LAU] Questions about LV2, hermann meyer, (Tue May 14, 9:31 pm)
Re: [LAU] Questions about LV2, Harry van Haaren, (Tue May 14, 9:57 pm)
Re: [LAU] Questions about LV2, Julien Claassen, (Tue May 14, 9:43 pm)
Re: [LAU] Questions about LV2, hermann meyer, (Tue May 14, 10:01 pm)
Re: [LAU] Questions about LV2, Harry van Haaren, (Tue May 14, 9:59 pm)
Re: [LAU] Questions about LV2, Rui Nuno Capela, (Wed May 15, 11:20 am)
Re: [LAU] Questions about LV2, Florian Paul Schmidt, (Tue May 14, 10:42 am)