There are a few things under the hood:
1. I have several `connect` functions which have different type signatures:
- For filter:
https://github.com/mantielero/mlt.nim/blob/51245b9fea6ad1555687ff9229c66ca17a6d3ffb/src/lib/filter.nim#L5-L8
- For consumer:
https://github.com/mantielero/mlt.nim/blob/51245b9fea6ad1555687ff9229c66ca17a6d3ffb/src/lib/consumer.nim#L30-L33
For this functions, I just map: `mlt_filter_connect` with the equivalent
signature.
2. Given that they work with Service, I just create a number of converters.
In nim converters, are used to change type automatically. You can see for
example the following which coverts from Producer to Service automatically:
https://github.com/mantielero/mlt.nim/blob/51245b9fea6ad1555687ff9229c66ca17a6d3ffb/src/lib/producer.nim#L8-L10
This enables using a `Producer` directly with the `connect` function
without the need of getting previously the Service (that is done
implicitly).
3. I just create the `>` operators in a way that for me make more sense
visually: from the producer to the consumer. They just call `connect`.
I have wrapped the `mlt_service_attach` function (I wasn't aware of it). So
now, the following works as well:
```
clip.attach( filter )
clip > sdl
```
https://github.com/mantielero/mlt.nim/blob/master/examples/ex05_filter_frei0r_attach.nim
PS: sorry if the wording is not right. I am not a pro developer.
Regards,
José M.
El sáb, 20 nov 2021 a las 20:34, Dan Dennedy (<d...@dennedy.org>) escribió:
> Thanks for sharing that. Read more below...
>
> On Sat, Nov 20, 2021 at 8:54 AM José María García Pérez <
> josemaria.alk...@gmail.com> wrote:
>
>> I implemented some examples in the Nim programming language. Nim compiles
>> into C (among other languages).
>>
>> I like that it gives you the feeling of python despite it is using actual
>> types.
>>
>> The code looks as follows:
>> ```
>> import mlt, os
>> var f = initFactory()
>>
>> # Create the default consumer
>> var p = newProfile()
>> var sdl = newFactoryConsumer(p, "sdl2")
>>
>> # Create via the default producer
>> var clip = newFactoryProducer(p, resource =
>> "avformat:/home/jose/Descargas/sygic.mp4")
>>
>> var filter = newFactoryFilter(p, "frei0r.pixeliz0r")
>> filter["BlockSizeX"] = 0.1
>> filter["BlockSizeY"] = 0.2
>>
>> clip > filter
>> filter > sdl
>>
>>
>
> So, the > operator is mapped to both mlt_service_connect_producer() and
> mlt_service_attach()? I do not understand how the sdl consumer is
> connecting to the filter because the filter should be *attached* to the
> producer, and the consumer *connected* to the producer.
>
>
>
>> # Start the consumer
>> sdl.start
>>
>> while not sdl.stopped:
>> sleep(1)
>> ```
>> As I said, it compiles to C. If compiled in release mode, the executable
>> only takes 115kb.
>>
>> This is just a starting point. You can see some more examples here:
>> https://github.com/mantielero/mlt.nim/tree/master/examples
>>
>> Regards,
>> José María
>>
>>
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