gstreamer/subclass/
pad.rs

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1// Take a look at the license at the top of the repository in the LICENSE file.
2
3use glib::{prelude::*, subclass::prelude::*, translate::*};
4
5use super::prelude::*;
6use crate::{ffi, Pad};
7
8pub trait PadImpl: GstObjectImpl + ObjectSubclass<Type: IsA<Pad>> {
9    fn linked(&self, peer: &Pad) {
10        self.parent_linked(peer)
11    }
12
13    fn unlinked(&self, peer: &Pad) {
14        self.parent_unlinked(peer)
15    }
16}
17
18pub trait PadImplExt: PadImpl {
19    fn parent_linked(&self, peer: &Pad) {
20        unsafe {
21            let data = Self::type_data();
22            let parent_class = data.as_ref().parent_class() as *mut ffi::GstPadClass;
23
24            (*parent_class)
25                .linked
26                .map(|f| {
27                    f(
28                        self.obj().unsafe_cast_ref::<Pad>().to_glib_none().0,
29                        peer.to_glib_none().0,
30                    )
31                })
32                .unwrap_or(())
33        }
34    }
35
36    fn parent_unlinked(&self, peer: &Pad) {
37        unsafe {
38            let data = Self::type_data();
39            let parent_class = data.as_ref().parent_class() as *mut ffi::GstPadClass;
40
41            (*parent_class)
42                .unlinked
43                .map(|f| {
44                    f(
45                        self.obj().unsafe_cast_ref::<Pad>().to_glib_none().0,
46                        peer.to_glib_none().0,
47                    )
48                })
49                .unwrap_or(())
50        }
51    }
52}
53
54impl<T: PadImpl> PadImplExt for T {}
55
56unsafe impl<T: PadImpl> IsSubclassable<T> for Pad {
57    fn class_init(klass: &mut glib::Class<Self>) {
58        Self::parent_class_init::<T>(klass);
59        let klass = klass.as_mut();
60        klass.linked = Some(pad_linked::<T>);
61        klass.unlinked = Some(pad_unlinked::<T>);
62    }
63}
64
65unsafe extern "C" fn pad_linked<T: PadImpl>(ptr: *mut ffi::GstPad, peer: *mut ffi::GstPad) {
66    let instance = &*(ptr as *mut T::Instance);
67    let imp = instance.imp();
68
69    imp.linked(&from_glib_borrow(peer))
70}
71
72unsafe extern "C" fn pad_unlinked<T: PadImpl>(ptr: *mut ffi::GstPad, peer: *mut ffi::GstPad) {
73    let instance = &*(ptr as *mut T::Instance);
74    let imp = instance.imp();
75
76    imp.unlinked(&from_glib_borrow(peer))
77}
78
79#[cfg(test)]
80mod tests {
81    use std::sync::atomic;
82
83    use super::*;
84    use crate::{prelude::*, PadDirection};
85
86    pub mod imp {
87        use super::*;
88
89        #[derive(Default)]
90        pub struct TestPad {
91            pub(super) linked: atomic::AtomicBool,
92            pub(super) unlinked: atomic::AtomicBool,
93        }
94
95        #[glib::object_subclass]
96        impl ObjectSubclass for TestPad {
97            const NAME: &'static str = "TestPad";
98            type Type = super::TestPad;
99            type ParentType = Pad;
100        }
101
102        impl ObjectImpl for TestPad {}
103
104        impl GstObjectImpl for TestPad {}
105
106        impl PadImpl for TestPad {
107            fn linked(&self, peer: &Pad) {
108                self.linked.store(true, atomic::Ordering::SeqCst);
109                self.parent_linked(peer)
110            }
111
112            fn unlinked(&self, peer: &Pad) {
113                self.unlinked.store(true, atomic::Ordering::SeqCst);
114                self.parent_unlinked(peer)
115            }
116        }
117    }
118
119    glib::wrapper! {
120        pub struct TestPad(ObjectSubclass<imp::TestPad>) @extends Pad, crate::Object;
121    }
122
123    impl TestPad {
124        pub fn new(name: &str, direction: PadDirection) -> Self {
125            glib::Object::builder()
126                .property("name", name)
127                .property("direction", direction)
128                .build()
129        }
130    }
131
132    #[test]
133    fn test_pad_subclass() {
134        crate::init().unwrap();
135
136        let pad = TestPad::new("test", PadDirection::Src);
137
138        assert_eq!(pad.name(), "test");
139
140        let otherpad = Pad::builder(PadDirection::Sink).name("other-test").build();
141        pad.link(&otherpad).unwrap();
142        pad.unlink(&otherpad).unwrap();
143
144        let imp = pad.imp();
145        assert!(imp.linked.load(atomic::Ordering::SeqCst));
146        assert!(imp.unlinked.load(atomic::Ordering::SeqCst));
147    }
148}
gstreamer/subclass/pad.rs

gstreamer/subclass/
pad.rs
