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
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193

// Copyright (C) 2018 Sebastian Dröge <sebastian@centricular.com>
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use glib_ffi;
use gobject_ffi;
use gst_ffi;

use glib;
use glib::translate::*;
use gst;
use libc;

use gobject_subclass::anyimpl::*;
use gobject_subclass::object::*;

pub trait ChildProxyImpl: AnyImpl + Send + Sync + 'static {
    fn get_child_by_name(&self, object: &gst::ChildProxy, name: &str) -> Option<glib::Object> {
        unsafe {
            let type_ = gst_ffi::gst_child_proxy_get_type();
            let iface = gobject_ffi::g_type_default_interface_ref(type_)
                as *mut gst_ffi::GstChildProxyInterface;
            assert!(!iface.is_null());

            let ret = ((*iface).get_child_by_name.as_ref().unwrap())(
                object.to_glib_none().0,
                name.to_glib_none().0,
            );

            gobject_ffi::g_type_default_interface_unref(iface as glib_ffi::gpointer);

            from_glib_full(ret)
        }
    }

    fn get_child_by_index(&self, object: &gst::ChildProxy, index: u32) -> Option<glib::Object>;
    fn get_children_count(&self, object: &gst::ChildProxy) -> u32;

    fn child_added(&self, object: &gst::ChildProxy, child: &glib::Object, name: &str);
    fn child_removed(&self, object: &gst::ChildProxy, child: &glib::Object, name: &str);
}

any_impl!(ChildProxyImpl);

pub trait ChildProxyImplStatic<T: ObjectType>: Send + Sync + 'static {
    fn get_impl<'a>(&self, imp: &'a T::ImplType) -> &'a ChildProxyImpl;
}

struct ChildProxyStatic<T: ObjectType> {
    imp_static: *const ChildProxyImplStatic<T>,
}

unsafe extern "C" fn child_proxy_get_child_by_name<T: ObjectType>(
    child_proxy: *mut gst_ffi::GstChildProxy,
    name: *const libc::c_char,
) -> *mut gobject_ffi::GObject {
    floating_reference_guard!(child_proxy);

    let klass = &**(child_proxy as *const *const ClassStruct<T>);
    let interface_static = klass.get_interface_static(gst_ffi::gst_child_proxy_get_type())
        as *const ChildProxyStatic<T>;

    let instance = &*(child_proxy as *const T::InstanceStructType);
    let imp = instance.get_impl();
    let imp = (*(*interface_static).imp_static).get_impl(imp);

    imp.get_child_by_name(
        &from_glib_borrow(child_proxy),
        String::from_glib_none(name).as_str(),
    ).to_glib_full()
}

unsafe extern "C" fn child_proxy_get_child_by_index<T: ObjectType>(
    child_proxy: *mut gst_ffi::GstChildProxy,
    index: u32,
) -> *mut gobject_ffi::GObject {
    floating_reference_guard!(child_proxy);

    let klass = &**(child_proxy as *const *const ClassStruct<T>);
    let interface_static = klass.get_interface_static(gst_ffi::gst_child_proxy_get_type())
        as *const ChildProxyStatic<T>;

    let instance = &*(child_proxy as *const T::InstanceStructType);
    let imp = instance.get_impl();
    let imp = (*(*interface_static).imp_static).get_impl(imp);

    imp.get_child_by_index(&from_glib_borrow(child_proxy), index)
        .to_glib_full()
}

unsafe extern "C" fn child_proxy_get_children_count<T: ObjectType>(
    child_proxy: *mut gst_ffi::GstChildProxy,
) -> u32 {
    floating_reference_guard!(child_proxy);

    let klass = &**(child_proxy as *const *const ClassStruct<T>);
    let interface_static = klass.get_interface_static(gst_ffi::gst_child_proxy_get_type())
        as *const ChildProxyStatic<T>;

    let instance = &*(child_proxy as *const T::InstanceStructType);
    let imp = instance.get_impl();
    let imp = (*(*interface_static).imp_static).get_impl(imp);

    imp.get_children_count(&from_glib_borrow(child_proxy))
}

unsafe extern "C" fn child_proxy_child_added<T: ObjectType>(
    child_proxy: *mut gst_ffi::GstChildProxy,
    child: *mut gobject_ffi::GObject,
    name: *const libc::c_char,
) {
    floating_reference_guard!(child_proxy);

    let klass = &**(child_proxy as *const *const ClassStruct<T>);
    let interface_static = klass.get_interface_static(gst_ffi::gst_child_proxy_get_type())
        as *const ChildProxyStatic<T>;

    let instance = &*(child_proxy as *const T::InstanceStructType);
    let imp = instance.get_impl();
    let imp = (*(*interface_static).imp_static).get_impl(imp);

    imp.child_added(
        &from_glib_borrow(child_proxy),
        &from_glib_borrow(child),
        String::from_glib_none(name).as_str(),
    )
}

unsafe extern "C" fn child_proxy_child_removed<T: ObjectType>(
    child_proxy: *mut gst_ffi::GstChildProxy,
    child: *mut gobject_ffi::GObject,
    name: *const libc::c_char,
) {
    floating_reference_guard!(child_proxy);

    let klass = &**(child_proxy as *const *const ClassStruct<T>);
    let interface_static = klass.get_interface_static(gst_ffi::gst_child_proxy_get_type())
        as *const ChildProxyStatic<T>;

    let instance = &*(child_proxy as *const T::InstanceStructType);
    let imp = instance.get_impl();
    let imp = (*(*interface_static).imp_static).get_impl(imp);

    imp.child_removed(
        &from_glib_borrow(child_proxy),
        &from_glib_borrow(child),
        String::from_glib_none(name).as_str(),
    )
}

unsafe extern "C" fn child_proxy_init<T: ObjectType>(
    iface: glib_ffi::gpointer,
    iface_data: glib_ffi::gpointer,
) {
    let child_proxy_iface = &mut *(iface as *mut gst_ffi::GstChildProxyInterface);

    let iface_type = (*(iface as *const gobject_ffi::GTypeInterface)).g_type;
    let type_ = (*(iface as *const gobject_ffi::GTypeInterface)).g_instance_type;
    let klass = &mut *(gobject_ffi::g_type_class_ref(type_) as *mut ClassStruct<T>);
    let interfaces_static = &mut *(klass.interfaces_static as *mut Vec<_>);
    interfaces_static.push((iface_type, iface_data));

    child_proxy_iface.get_child_by_name = Some(child_proxy_get_child_by_name::<T>);
    child_proxy_iface.get_child_by_index = Some(child_proxy_get_child_by_index::<T>);
    child_proxy_iface.get_children_count = Some(child_proxy_get_children_count::<T>);
    child_proxy_iface.child_added = Some(child_proxy_child_added::<T>);
    child_proxy_iface.child_removed = Some(child_proxy_child_removed::<T>);
}

pub fn register_child_proxy<T: ObjectType, I: ChildProxyImplStatic<T>>(
    _: &TypeInitToken,
    type_: glib::Type,
    imp: &I,
) {
    unsafe {
        let imp = imp as &ChildProxyImplStatic<T> as *const ChildProxyImplStatic<T>;
        let interface_static = Box::new(ChildProxyStatic { imp_static: imp });

        let iface_info = gobject_ffi::GInterfaceInfo {
            interface_init: Some(child_proxy_init::<T>),
            interface_finalize: None,
            interface_data: Box::into_raw(interface_static) as glib_ffi::gpointer,
        };
        gobject_ffi::g_type_add_interface_static(
            type_.to_glib(),
            gst_ffi::gst_child_proxy_get_type(),
            &iface_info,
        );
    }
}