gstreamer/subclass/
bin.rs

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, Bin, Element, LoggableError, Message};
7
8pub trait BinImpl: BinImplExt + ElementImpl {
9    fn add_element(&self, element: &Element) -> Result<(), LoggableError> {
10        self.parent_add_element(element)
11    }
12
13    fn remove_element(&self, element: &Element) -> Result<(), LoggableError> {
14        self.parent_remove_element(element)
15    }
16
17    fn do_latency(&self) -> Result<(), LoggableError> {
18        self.parent_do_latency()
19    }
20
21    fn handle_message(&self, message: Message) {
22        self.parent_handle_message(message)
23    }
24}
25
26mod sealed {
27    pub trait Sealed {}
28    impl<T: super::BinImplExt> Sealed for T {}
29}
30
31pub trait BinImplExt: sealed::Sealed + ObjectSubclass {
32    fn parent_add_element(&self, element: &Element) -> Result<(), LoggableError> {
33        unsafe {
34            let data = Self::type_data();
35            let parent_class = data.as_ref().parent_class() as *mut ffi::GstBinClass;
36            let f = (*parent_class).add_element.ok_or_else(|| {
37                loggable_error!(
38                    crate::CAT_RUST,
39                    "Parent function `add_element` is not defined"
40                )
41            })?;
42            result_from_gboolean!(
43                f(
44                    self.obj().unsafe_cast_ref::<crate::Bin>().to_glib_none().0,
45                    element.to_glib_none().0
46                ),
47                crate::CAT_RUST,
48                "Failed to add the element using the parent function"
49            )
50        }
51    }
52
53    fn parent_remove_element(&self, element: &Element) -> Result<(), LoggableError> {
54        unsafe {
55            let data = Self::type_data();
56            let parent_class = data.as_ref().parent_class() as *mut ffi::GstBinClass;
57            let f = (*parent_class).remove_element.ok_or_else(|| {
58                loggable_error!(
59                    crate::CAT_RUST,
60                    "Parent function `remove_element` is not defined"
61                )
62            })?;
63            result_from_gboolean!(
64                f(
65                    self.obj().unsafe_cast_ref::<crate::Bin>().to_glib_none().0,
66                    element.to_glib_none().0
67                ),
68                crate::CAT_RUST,
69                "Failed to remove the element using the parent function"
70            )
71        }
72    }
73
74    fn parent_do_latency(&self) -> Result<(), LoggableError> {
75        unsafe {
76            let data = Self::type_data();
77            let parent_class = data.as_ref().parent_class() as *mut ffi::GstBinClass;
78            let f = (*parent_class).do_latency.ok_or_else(|| {
79                loggable_error!(
80                    crate::CAT_RUST,
81                    "Parent function `do_latency` is not defined"
82                )
83            })?;
84            result_from_gboolean!(
85                f(self.obj().unsafe_cast_ref::<crate::Bin>().to_glib_none().0,),
86                crate::CAT_RUST,
87                "Failed to update latency using the parent function"
88            )
89        }
90    }
91
92    fn parent_handle_message(&self, message: Message) {
93        unsafe {
94            let data = Self::type_data();
95            let parent_class = data.as_ref().parent_class() as *mut ffi::GstBinClass;
96            if let Some(ref f) = (*parent_class).handle_message {
97                f(
98                    self.obj().unsafe_cast_ref::<crate::Bin>().to_glib_none().0,
99                    message.into_glib_ptr(),
100                );
101            }
102        }
103    }
104}
105
106impl<T: BinImpl> BinImplExt for T {}
107
108unsafe impl<T: BinImpl> IsSubclassable<T> for Bin {
109    fn class_init(klass: &mut glib::Class<Self>) {
110        Self::parent_class_init::<T>(klass);
111        let klass = klass.as_mut();
112        klass.add_element = Some(bin_add_element::<T>);
113        klass.remove_element = Some(bin_remove_element::<T>);
114        klass.do_latency = Some(bin_do_latency::<T>);
115        klass.handle_message = Some(bin_handle_message::<T>);
116    }
117}
118
119unsafe extern "C" fn bin_add_element<T: BinImpl>(
120    ptr: *mut ffi::GstBin,
121    element: *mut ffi::GstElement,
122) -> glib::ffi::gboolean {
123    let instance = &*(ptr as *mut T::Instance);
124    let imp = instance.imp();
125
126    panic_to_error!(imp, false, {
127        match imp.add_element(&from_glib_none(element)) {
128            Ok(()) => true,
129            Err(err) => {
130                err.log_with_imp(imp);
131                false
132            }
133        }
134    })
135    .into_glib()
136}
137
138unsafe extern "C" fn bin_remove_element<T: BinImpl>(
139    ptr: *mut ffi::GstBin,
140    element: *mut ffi::GstElement,
141) -> glib::ffi::gboolean {
142    let instance = &*(ptr as *mut T::Instance);
143    let imp = instance.imp();
144
145    // If we get a floating reference passed simply return FALSE here. It can't be
146    // stored inside this bin, and if we continued to use it we would take ownership
147    // of this floating reference.
148    if glib::gobject_ffi::g_object_is_floating(element as *mut glib::gobject_ffi::GObject)
149        != glib::ffi::GFALSE
150    {
151        return glib::ffi::GFALSE;
152    }
153
154    panic_to_error!(imp, false, {
155        match imp.remove_element(&from_glib_none(element)) {
156            Ok(()) => true,
157            Err(err) => {
158                err.log_with_imp(imp);
159                false
160            }
161        }
162    })
163    .into_glib()
164}
165
166unsafe extern "C" fn bin_do_latency<T: BinImpl>(ptr: *mut ffi::GstBin) -> glib::ffi::gboolean {
167    let instance = &*(ptr as *mut T::Instance);
168    let imp = instance.imp();
169
170    panic_to_error!(imp, false, {
171        match imp.do_latency() {
172            Ok(()) => true,
173            Err(err) => {
174                err.log_with_imp(imp);
175                false
176            }
177        }
178    })
179    .into_glib()
180}
181
182unsafe extern "C" fn bin_handle_message<T: BinImpl>(
183    ptr: *mut ffi::GstBin,
184    message: *mut ffi::GstMessage,
185) {
186    let instance = &*(ptr as *mut T::Instance);
187    let imp = instance.imp();
188
189    panic_to_error!(imp, (), { imp.handle_message(from_glib_full(message)) });
190}
gstreamer/subclass/bin.rs

gstreamer/subclass/
bin.rs
