kamera 0.0.2

Camera API with a reduced feature set for basic use cases and learning
Documentation 
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use std::ffi::*;
use std::ptr::null;

use icrate::Foundation::*;
use objc2::rc::Id;
use objc2::runtime::NSObject;
use objc2::*;

use super::SampleBufferDelegate;

extern_class!(
    #[derive(PartialEq, Eq, Hash, Debug)]
    pub struct AVCaptureVideoDataOutput;

    unsafe impl ClassType for AVCaptureVideoDataOutput {
        type Super = NSObject;
        type Mutability = mutability::InteriorMutable;
    }
);

unsafe impl NSObjectProtocol for AVCaptureVideoDataOutput {}

impl AVCaptureVideoDataOutput {
    pub fn new() -> Id<Self> {
        unsafe { msg_send_id![Self::class(), new] }
    }

    pub fn set_sample_buffer_delegate(&self, delegate: Id<SampleBufferDelegate>) {
        let name = std::ffi::CString::new("video input").unwrap();
        let queue = unsafe { dispatch_queue_create(name.as_ptr(), null()) };
        let _: () = unsafe { msg_send!(self, setSampleBufferDelegate: &*delegate queue: queue) };
        std::mem::forget(delegate);
    }
}

extern_methods! {
    unsafe impl AVCaptureVideoDataOutput {
        #[method(setVideoSettings:)]
        pub fn set_video_settings(&self, settings: &NSDictionary<NSString, NSNumber>);

        // #[method(setSampleBufferDelegate:queue:)]
        // fn set_sample_buffer_delegate(&mut self, delegate: &NSObject, queue: DispatchQueueT);
    }
}

// libdispatch is loaded differently on MacOS and iOS. Have a look in https://docs.rs/dispatch
// We don't care about the exact types.
#[link(name = "System", kind = "dylib")]
extern "C" {
    pub fn dispatch_queue_create(name: *const c_char, attr: *const c_void) -> DispatchQueueT;
    // TODO use it and don't leak queues
    // pub fn dispatch_release(queue: DispatchQueueT);
}

pub type DispatchQueueT = *mut NSObject;

#[test]
fn new() {
    let output = AVCaptureVideoDataOutput::new();
    println!("{output:?}");
}