Draft implementation of nannou_webcam

[l1npengtul]

This is a draft implementation of nannou_webcam, an extension to nannou to allow for simple webcam capture. See #464

Currently Implemented are MSMF, V4L2, and AVFoundation* backends. WASM will require some work. This crate re-exports nokhwa to fit nannou.

(Disclaimer - I made nokhwa)

*: AVFoundation is weird and will ignore user settings. If anyone can get their hands on an C API for AVFoundation, please let me know

[l1npengtul]

Waiting on RustAudio/cpal#620 to re-enable ASIO feature

Also working on enabling JSCAM and IPCAM for this

[mitchmindtree]

Omg epic work @l1npengtul, this is awesome! I'll dive in and review this properly soon. nokhwa looks amazing by the way, looking forward to trying it out.

[l1npengtul]

Thanks! This is a draft since I am working on 0.9.2 (Properly fix media foundation) and I'll eventually work on 0.10 when a couple things become availible in wasm-bindgen.

[l1npengtul]

I believe that this is ready for review but we are still blocked on waiting for CPAL to update their bindgen.

[l1npengtul]

CPAL bindgen updated! Just have to wait for the 0.2.1 on crates now.

[rrrnld]

Heya, thanks for working on this. :) I just tried running this fork and I'm hit with the following error:

thread 'main' panicked at 'cannot execute `LocalPool` executor from within another executor: EnterError', /home/arne/.cargo/registry/src/github.com-1ecc6299db9ec823/futures-executor-0.3.24/src/local_pool.rs:81:26
stack backtrace:
   0: rust_begin_unwind
   1: core::panicking::panic_fmt
   2: core::result::unwrap_failed
   3: core::result::Result<T,E>::expect
             at /build/rustc-1.62.1-src/library/core/src/result.rs:1035:23
   4: futures_executor::local_pool::run_executor
             at /home/arne/.cargo/registry/src/github.com-1ecc6299db9ec823/futures-executor-0.3.24/src/local_pool.rs:81:18
   5: futures_executor::local_pool::block_on
             at /home/arne/.cargo/registry/src/github.com-1ecc6299db9ec823/futures-executor-0.3.24/src/local_pool.rs:317:5
   6: nannou::window::Builder::build
             at /home/arne/.cargo/git/checkouts/nannou-c1eab9fe2746171b/2eee004/nannou/src/window.rs:731:9
   7: nannou_webcam::model
             at ./src/main.rs:15:19
   8: nannou::app::Builder<M>::new::{{closure}}
             at /home/arne/.cargo/git/checkouts/nannou-c1eab9fe2746171b/2eee004/nannou/src/app.rs:255:59
   9: core::ops::function::FnOnce::call_once{{vtable.shim}}
             at /build/rustc-1.62.1-src/library/core/src/ops/function.rs:248:5
  10: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
             at /build/rustc-1.62.1-src/library/alloc/src/boxed.rs:1872:9
  11: nannou::app::Builder<M,E>::run_async::{{closure}}
             at /home/arne/.cargo/git/checkouts/nannou-c1eab9fe2746171b/2eee004/nannou/src/app.rs:498:31
  12: <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll
             at /build/rustc-1.62.1-src/library/core/src/future/mod.rs:91:19
  13: futures_executor::local_pool::block_on::{{closure}}
             at /home/arne/.cargo/registry/src/github.com-1ecc6299db9ec823/futures-executor-0.3.24/src/local_pool.rs:317:23
  14: futures_executor::local_pool::run_executor::{{closure}}
             at /home/arne/.cargo/registry/src/github.com-1ecc6299db9ec823/futures-executor-0.3.24/src/local_pool.rs:90:37
  15: std::thread::local::LocalKey<T>::try_with
             at /build/rustc-1.62.1-src/library/std/src/thread/local.rs:445:16
  16: std::thread::local::LocalKey<T>::with
             at /build/rustc-1.62.1-src/library/std/src/thread/local.rs:421:9
  17: futures_executor::local_pool::run_executor
             at /home/arne/.cargo/registry/src/github.com-1ecc6299db9ec823/futures-executor-0.3.24/src/local_pool.rs:86:5
  18: futures_executor::local_pool::block_on
             at /home/arne/.cargo/registry/src/github.com-1ecc6299db9ec823/futures-executor-0.3.24/src/local_pool.rs:317:5
  19: nannou::app::Builder<M,E>::run
             at /home/arne/.cargo/git/checkouts/nannou-c1eab9fe2746171b/2eee004/nannou/src/app.rs:454:9
  20: nannou_webcam::main
             at ./src/main.rs:11:5
  21: core::ops::function::FnOnce::call_once
             at /build/rustc-1.62.1-src/library/core/src/ops/function.rs:248:5

It tried to git pull --rebase it onto the current master branch of the repository at nannou-org/nannou, but I'm hit with the same error. I'm running rust 1.62.1. Any idea what causes this error?

[l1npengtul]

This is very old and outdated code, would need a lot more love to get it working again.