gstreamer 0.19.7

Rust bindings for GStreamer
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149

// Take a look at the license at the top of the repository in the LICENSE file.

use glib::prelude::*;
use glib::translate::*;

use glib::subclass::prelude::*;

use crate::URIHandler;
use crate::URIType;

use std::ptr;

pub trait URIHandlerImpl: super::element::ElementImpl {
    const URI_TYPE: URIType;
    fn protocols() -> &'static [&'static str];
    fn uri(&self) -> Option<String>;
    fn set_uri(&self, uri: &str) -> Result<(), glib::Error>;
}

pub trait URIHandlerImplExt: ObjectSubclass {
    fn parent_protocols() -> Vec<String>;
    fn parent_uri(&self) -> Option<String>;
    fn parent_set_uri(&self, uri: &str) -> Result<(), glib::Error>;
}

impl<T: URIHandlerImpl> URIHandlerImplExt for T {
    fn parent_protocols() -> Vec<String> {
        unsafe {
            let type_data = Self::type_data();
            let parent_iface = type_data.as_ref().parent_interface::<URIHandler>()
                as *const ffi::GstURIHandlerInterface;

            let func = (*parent_iface)
                .get_protocols
                .expect("no parent \"protocols\" implementation");
            let ret = func(Self::ParentType::static_type().into_glib());
            FromGlibPtrContainer::from_glib_none(ret)
        }
    }

    fn parent_uri(&self) -> Option<String> {
        unsafe {
            let type_data = Self::type_data();
            let parent_iface = type_data.as_ref().parent_interface::<URIHandler>()
                as *const ffi::GstURIHandlerInterface;

            let func = (*parent_iface)
                .get_uri
                .expect("no parent \"uri\" implementation");
            let ret = func(self.obj().unsafe_cast_ref::<URIHandler>().to_glib_none().0);
            from_glib_full(ret)
        }
    }

    fn parent_set_uri(&self, uri: &str) -> Result<(), glib::Error> {
        unsafe {
            let type_data = Self::type_data();
            let parent_iface = type_data.as_ref().parent_interface::<URIHandler>()
                as *const ffi::GstURIHandlerInterface;

            let func = (*parent_iface)
                .set_uri
                .expect("no parent \"set_uri\" implementation");

            let mut err = ptr::null_mut();
            func(
                self.obj().unsafe_cast_ref::<URIHandler>().to_glib_none().0,
                uri.to_glib_none().0,
                &mut err,
            );

            if !err.is_null() {
                Err(from_glib_full(err))
            } else {
                Ok(())
            }
        }
    }
}

// Send+Sync wrapper around a NULL-terminated C string array
struct CStrV(*const *const libc::c_char);
unsafe impl Send for CStrV {}
unsafe impl Sync for CStrV {}

unsafe impl<T: URIHandlerImpl> IsImplementable<T> for URIHandler {
    fn interface_init(iface: &mut glib::Interface<Self>) {
        let iface = iface.as_mut();

        // Store the protocols in the interface data for later use
        unsafe {
            let mut data = T::type_data();
            let protocols = T::protocols();
            let protocols = protocols.to_glib_full();
            let data = data.as_mut();

            data.set_class_data(Self::static_type(), CStrV(protocols));
        }

        iface.get_type = Some(uri_handler_get_type::<T>);
        iface.get_protocols = Some(uri_handler_get_protocols::<T>);
        iface.get_uri = Some(uri_handler_get_uri::<T>);
        iface.set_uri = Some(uri_handler_set_uri::<T>);
    }
}

unsafe extern "C" fn uri_handler_get_type<T: URIHandlerImpl>(
    _type_: glib::ffi::GType,
) -> ffi::GstURIType {
    <T as URIHandlerImpl>::URI_TYPE.into_glib()
}

unsafe extern "C" fn uri_handler_get_protocols<T: URIHandlerImpl>(
    _type_: glib::ffi::GType,
) -> *const *const libc::c_char {
    let data = <T as ObjectSubclassType>::type_data();
    data.as_ref()
        .class_data::<CStrV>(URIHandler::static_type())
        .unwrap_or(&CStrV(std::ptr::null()))
        .0
}

unsafe extern "C" fn uri_handler_get_uri<T: URIHandlerImpl>(
    uri_handler: *mut ffi::GstURIHandler,
) -> *mut libc::c_char {
    let instance = &*(uri_handler as *mut T::Instance);
    let imp = instance.imp();

    imp.uri().to_glib_full()
}

unsafe extern "C" fn uri_handler_set_uri<T: URIHandlerImpl>(
    uri_handler: *mut ffi::GstURIHandler,
    uri: *const libc::c_char,
    err: *mut *mut glib::ffi::GError,
) -> glib::ffi::gboolean {
    let instance = &*(uri_handler as *mut T::Instance);
    let imp = instance.imp();

    match imp.set_uri(glib::GString::from_glib_borrow(uri).as_str()) {
        Ok(()) => true.into_glib(),
        Err(error) => {
            if !err.is_null() {
                *err = error.into_glib_ptr();
            }
            false.into_glib()
        }
    }
}