Macro wrap_media_sink_device_info_callback 

macro_rules! wrap_media_sink_device_info_callback {
    ($ vis : vis struct $ name : ident ; impl MediaSinkDeviceInfoCallback { $ ($ (# [$ attrs_name : meta]) * fn $ method_name : ident (& $ self : ident $ (, $ arg_name : ident : $ arg_type : ty) * $ (,) ?) $ (-> $ return_type : ty) ? { $ ($ body : tt) * }) * }) => { ... };
    ($ vis : vis struct $ name : ident $ (< $ ($ generic_type : ident : $ first_generic_type_bound : tt $ (+ $ generic_type_bound : tt) *) , + $ (,) ? >) ? { $ ($ field_vis : vis $ field_name : ident : $ field_type : ty) , * $ (,) ? } impl MediaSinkDeviceInfoCallback { $ ($ (# [$ attrs_name : meta]) * fn $ method_name : ident (& $ self : ident $ (, $ arg_name : ident : $ arg_type : ty) * $ (,) ?) $ (-> $ return_type : ty) ? { $ ($ body : tt) * }) * }) => { ... };
}

Implement the WrapMediaSinkDeviceInfoCallback trait for the specified struct. You can declare more members for your struct, and in the impl MediaSinkDeviceInfoCallback block you can override default methods implemented by the ImplMediaSinkDeviceInfoCallback trait.

Example

wrap_media_sink_device_info_callback! {
    struct MyMediaSinkDeviceInfoCallback {
        payload: String,
    }

    impl MediaSinkDeviceInfoCallback {
        // ...
    }
}

fn make_my_struct() -> MediaSinkDeviceInfoCallback {
    MyMediaSinkDeviceInfoCallback::new("payload".to_string())
}