[LAD] RDF libraries, was Re: [ANN] IR: LV2 Convolution Reverb

[Olivier Guilyardi]

On 02/26/2011 07:07 PM, David Robillard wrote:
> On Sat, 2011-02-26 at 17:33 +0100, Olivier Guilyardi wrote:
> [...]
>> This RDF turtle format is surely a beautiful thing when you write or read it,
>> but it requires such a parsing machinery...
> 
> The serd reader is about 1300 lines of C with no dependencies.

Sounds good.

>> What about an alternative format intended for lightweight packaging and parsing?
>> It would take the turtle metadata and convert it into a text file which could be
>> parsed with about 100 lines of C. It may not work for all plugins, but maybe for
>> the vast majority of them?
> 
> If you want a /really/ simple to parse RDF text format, it's ntriples.
> The actual data itself would become significantly larger than the space
> you save in the parsing code. I doubt this would be a net space savings,
> unless very few plugins are involved. You could gzip it or something,
> but then the plugin format is broken/wierd and you need even more
> machinery...
> 
> libserd.so is 34K on my 64-bit machine (compiled with -Os), and that
> includes an abbreviating serialiser. If you stripped it down to the
> reader it would be significantly smaller still (let's say halved).

I don't get it. Do you mean that libserd is the only thing that I would need in
the host?

>> At least I'm thinking about that kind of solution for packaging for Android.
>> Some kind of pre-parsing/metadata-simplification at packaging stage to avoid the
>> need for bundling a full-fledged parser.
> 
> Is that "full-fledged" parser really too big? You can't spend ~20K in a
> program that's loading plugins and doing audio processing? Let's keep
> things in perspective here: this parser is about as large as a simple
> plugin or two, and certainly smaller than some. I don't think claiming
> this is an unacceptable implementation size for using those plugins is
> at all reasonable. The heavyweight parsing machinery problem is a thing
> of the past.

20K? Now we're talking :)

But I don't understand exactly what's required in the host and also during
packaging to achieve such a tiny requirement.

--
  Olivier