Add support to gst-plugins-rs

[rgonzalezfluendo]

Issue to track the status.

[rgonzalezfluendo]

Build gst-plugins-rs with wasm32-unknown-emscripten target is blocked in rust-lang/libc#3306

Related PR:

• Fix: time_t is 64 bits on Emscripten rust-lang/libc#3569
• emscripten: Upgrade emsdk to 3.1.68 rust-lang/libc#3962

[sdroege]

I think for the time being it would be OK to require a custom rustc with those changes. Building rustc is simple enough and in my experience building/deploying anything wasm-related more often than not requires a very specific toolchain anyway. Just like you need exactly emscripten 3.1.61 AFAIU.

If you need help with that part, let me know!

[sdroege]

It also seems like this has more urgency now considering https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/8079 as the lack of Rust support here is the deciding factor on your side to use C for upstream code that really shouldn't be in C nowadays.

[sdroege]

Also this is apparently already fixed in nightly and beta, and will be in the next Rust release in 6 weeks. So simply requiring a beta 1.84 or nightly toolchain would already solve this part too.

[rgonzalezfluendo]

Right, Rust 1.84 will include emsdk 3.1.68. A good Xmas present.

First PR to work on this fluendo/cerbero#406, next steps fork glib-rs as was done for glib.