Crossbeam (channels only)

[entropin]

First, change is needed for allowing for multiple video receivers.

[QuantumEntangledAndy]

Also when you send with a crossbeam chamnel to multiple receivers you do know that only one receiver will get it right?

It's sort of just a queue of items and who every pulls it out of the channel first will get it

[entropin]

Yes, am planning to build a broadcaster like discussed here:

https://github.com/crossbeam-rs/crossbeam-channel/issues/24

And it seems like crossbeam is more flexible than normal channels, but I could be wrong

[entropin]

So what I tried and failed miserably with yesterday, was to add a Vec or a HashMap to the camera, containing Option(fn). So that I can subscribe bcCamera.subscribe(callback) and send a clone of all bc_media to all functions subscribed.

But rust did not let me do that across threads.

Do you see a way of doing this without creating multiple channels and senders?

[QuantumEntangledAndy]

Hmm I've never tried registering callbacks. I've only ever needed callbacks that I can make a trait for.

What about

Arc<dyn FnMut(i32)>

Although I am not sure it will work the way I think

[QuantumEntangledAndy]

I'm not sure if its helpful but maybe also check out scoped callbacks

[QuantumEntangledAndy]

Closures have to be handled carefully you need to ensure that everything that goes into it has to have the right lifetime to last as long as need.

I usual try a different design. Why do you want to use a closure like this? Is there another way to do it?

[entropin]

I'll try some more and come back to you with a example that is not working :D

But yes. It still feels like am trying to bend Rust due to having a object oriented / static thinking :D

[entropin]

Ok, so the problem itself is solved :D I was thinking about it all wrong.. I just needed to do a custom impl of StreamOutput's write function, collect the BcMedia there and distribute them from there, the BcMedia was easy to clone, and I can then send them both to a video processor/filter or video server like the RTSP mod, and still get stills and issue commands.

Am basically, just testing ideas to learn Rust, I just chose a bad one :D But the wage goal that I use to learn, is to implement a custom web client with video preview and actions.

[QuantumEntangledAndy]

Yeah that's why it's a trait so you can implement it anyway you want. Kinda like a callback object.

[entropin]

Yes, so I'll attack it from a different direction :) I want to support different video filters and AI prosessing of the video but still broadcast the altered stream over rtsp.

So I'll try to find a nice way of init the rtps mod from my new "filer mod" but giving it a channel to that receives BcMedia from instead of creating it's own subscription.

[QuantumEntangledAndy]

If you only need read access to the BcMedia consider sharing it as an Arc or something so you don't need to clone it at all saving you some memory

[QuantumEntangledAndy]

Closing as it seems you found a different way to handle this. Hope it went well for you