[LV2] How to load a LV2 preset stored in a Turtle file?

[Sylvain Leroux]

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Hi everyone,

I would like to extend lv2apply
(https://github.com/drobilla/lilv/blob/master/utils/lv2apply.c) to
support presets and plug-in states stored as Turtle data files.

I've tried to do my homework, but the many different projects hosted
on http://drobilla.net and http://lv2plug.in are pretty dense and I'm
having  hard time finding my way. I think I already bothered some of
you by mail or through GitHub issues. But I still need some help.

As a starting point, I would like to load a preset (example below). I
think I should use either serd,sord, or sratom. But I'm not quite sure
which of these libraries is suitable for that task, nor how exactly to
load a Turtle file. Maybe someone could point me to an example?

Thanks in advance for your time,

- - Sylvain Leroux


*Preset.ttl*
```

@prefix atom: <http://lv2plug.in/ns/ext/atom#> .
@prefix lv2: <http://lv2plug.in/ns/lv2core#> .
@prefix pset: <http://lv2plug.in/ns/ext/presets#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix state: <http://lv2plug.in/ns/ext/state#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

<>
        a pset:Preset ;
        lv2:appliesTo <https://github.com/lucianodato/noise-repellent> ;
        rdfs:label "Preset" ;
        lv2:port [
                lv2:symbol "Residual_listen" ;
                pset:value 0.0
        ] , [
                lv2:symbol "adaptive_noise_learn" ;
                pset:value 0.0
        ] , [
                lv2:symbol "enable" ;
                pset:value 1.0
        ] , [
                lv2:symbol "masking" ;
                pset:value 5.0
        ] , [
                lv2:symbol "noise_learn" ;
                pset:value 0.0
        ] , [
                lv2:symbol "offset" ;
                pset:value 0.0
        ]

```


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