Subject: Re: [ecasound] ecs-files
From: Kai Vehmanen (k_AT_eca.cx)
Date: Thu Oct 18 2001 - 00:44:52 EEST
On Fri, 14 Sep 2001, janne halttunen wrote:
> One sleepless night, I thought about an XML-representation of the setup,
> something in the lines of:
Xml would indeed fit nicely for describing chainsetups. But at least for
now, I've wanted to keep ecasound xml-free. The bad side of xml is that
you need a parser for it --> a new dependency for ecasound.
But nothing stops from using external tools. For instance it would be
quite easy to write a python app that parses xml-chainsetup files, and
writes ecasound .ecs files as the output. This could be made transparent
to users with something like:
ecasoundxml some_chainsetup.xml -c
- conversion to some_chainsetup.ecs
- exec 'ecasound some_chainsetup.ecs -c'
> ..but I don't think it would be that useful. What would, instead, be of use
> in XML, is the cop-registers:
> <EFFECT type='internal'>
> <DESC>Amplifies signal by amplify-% percent.</DESC>
> I think this would be quite useful to application developers. I am half
> there myself, bar the param descriptions.
> What would be the best way to start gathering that info about effects'
Actually this is not necessary for internal effects, as all the required
information can already specified in the source code. Same applies to
LADSPA-plugins (you can check the information with the 'analyseplugin'
tool that comes with LADSPA_SDK).
But for describing ecasound's effect presets the above would be really
useful. Edi-3 actually deals with this issue, although not xml-based:
(edi-3) Extra parameters for effect presets describing its parameters,
- submitted: kaiv, 17.08.2001
I've been thinking about adding new preset-specific options. Something
- pd* (preset description)
- descripton: -pd:"A more verbose description of the preset."
- pp* (preset parameter information)
- upper bounds: -ppu:200,1.2,-,-
- lower bounds: -ppl:100,-1.0,0,-
- default values: -ppd:150,0,0,0
- type flags: -ppt:-,log,int,toggle
The above matches with hint information provided by LADSPA plugins and
ecasound's internal effects (libecasound/eca-operator.h). Let's try to
compose a complete example
two_filters = -efl:800 -ea:%lowgain | -efh:800 -ea:%highgain \
-pd:"Parallel highpass and lowpass filters." \
This would set the default for %lowgain and %highgain to 100, and
low-bound them to positive values. As no type flags are specified, the
parameters are to be treated as normal floating-point values.
With this information, internal effects, presets and LADSPA plugins would
look equal to users and applications like ecamegapedal which use this
hint-information for building user-intefaces.
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