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DPF
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Audio plugin developmento with DPF: first plugin
DPF, short name for Distrho Plugin Framework, is a framework for building audio plugins in C++, compared to JUCE is smaller and more "raw", but there's no commercial licensing or limitation, also it supports open formats like LADSPA and LV2. It has support for Linux and Windows, here I will assume you're using Linux, so some commands may differ in Windows.
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Basic knowledge about music production on Linux
For crossplatform plugin building - consider checking out https://github.com/DISTRHO/DPF
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Declarative, non-intrusive, compile-time C++ reflection for audio plug-ins
Re 1: Why not create a DPF wrapper for this and have DPF create the ladspa/dssi/vst2/vst3/lv2 for you? -> https://github.com/DISTRHO/DPF
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How to get started with building a plugin that can work on other platforms?
Nice to see you are interested in making audio plugins. Especially with LV2 support. OK, you can do LV2 plugin programming from scratch (like I did). The LV2 book https://lv2plug.in/book/ is a good starting point. But I would recommend the use of a plugin framework like DPF https://github.com/DISTRHO/DPF instead.
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I'm developing a basic sample player plugin called Drops.
I use DPF as a plugin framework so any wayland stuff should come to that. I have no clue how to implement such features. I'm not a real programmer. I only act as one on the internet.
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Develop a LV2 plugin
Alternatively you could look at using DPF to make the plugin: https://github.com/DISTRHO/DPF
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Best languages to learn for making lightweight plugin effects and instruments with their own wrappers?
There are free (as far as licensing goes) alternatives such as DPF, but you will be doing a lot more of your own legwork with this system as not as much is provided for you.
delimited
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Monoio – A thread-per-core Rust async runtime with io_uring
Oh, I have written my own share of userspace C context switching libraries, I know all the gory the details :). For example see my minimalist [1] stackful coroutine library: the full context switching logic is three inline asm instructions (99% of the complexity in that code is to transparently support throwing exceptions across coroutine boundaries with no overhead in the happy path).
You need compiler help for the custom calling convention support and possibly to optimize away the context switching overhead for stackful coroutines, which is something that compilers can already do for stackless coroutines.
The duff device is just a way to simulate stackless coroutines (i.e. async/await or whateverer) in plain C, in a way that the compiler can still optimize quite well.
[1] https://github.com/gpderetta/delimited/blob/master/delimited...
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Declarative, non-intrusive, compile-time C++ reflection for audio plug-ins
Using gcc extended asm you can pass literal constants to the asm and they will be expanded textually (or at least their address will). I don't think the details are fully documented anywhere and I had to use intel syntax to make it work, but it might be possible even wit AT&T syntax.
Take a look a this[1] for example. See how trampoline, the destructor and the size are passed in with the 'i' constraint and are referred to their value with the %cX constraint (yes, the code is write only and even with a lot of comments I have only the most vague idea of what I was trying to do here).
Probably more work is require for PIC though.
[1] https://github.com/gpderetta/delimited/blob/7e755d643ee45897...
What are some alternatives?
JUCE - JUCE is an open-source cross-platform C++ application framework for desktop and mobile applications, including VST, VST3, AU, AUv3, LV2 and AAX audio plug-ins.
actix-net - A collection of lower-level libraries for composable network services.
JUCE - The JUCE cross-platform C++ framework, with DISTRHO/KXStudio specific changes
wg-async - Working group dedicated to improving the foundations of Async I/O in Rust
avendish - declarative polyamorous cross-system intermedia objects
monoio - Rust async runtime based on io-uring.
Fundamental
vst3_public_sdk - VST 3 Implementation Helper Classes And Examples
LitterPower - Source Code for Litter Power
vst3sdk - VST 3 Plug-In SDK
essentia - C++ library for audio and music analysis, description and synthesis, including Python bindings