gstreamer-rs/gstreamer/src/subclass/uri_handler.rs

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// Copyright (C) 2017-2018 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.
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use glib_sys;
use gst_sys;
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use glib;
use glib::prelude::*;
use glib::translate::*;
use glib::subclass::prelude::*;
use libc;
use URIHandler;
use URIType;
pub trait URIHandlerImpl: super::element::ElementImpl {
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fn get_uri(&self, element: &URIHandler) -> Option<String>;
fn set_uri(&self, element: &URIHandler, uri: &str) -> Result<(), glib::Error>;
fn get_uri_type() -> URIType;
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fn get_protocols() -> Vec<String>;
}
unsafe impl<T: URIHandlerImpl> IsImplementable<T> for URIHandler {
unsafe extern "C" fn interface_init(
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iface: glib_sys::gpointer,
_iface_data: glib_sys::gpointer,
) {
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let uri_handler_iface = &mut *(iface as *mut gst_sys::GstURIHandlerInterface);
// Store the protocols in the interface data for later use
let mut data = T::type_data();
let protocols = T::get_protocols();
let protocols: *mut *const libc::c_char = protocols.to_glib_full();
let data = data.as_mut();
if data.interface_data.is_null() {
data.interface_data = Box::into_raw(Box::new(Vec::new()));
}
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(*(data.interface_data as *mut Vec<(glib_sys::GType, glib_sys::gpointer)>))
.push((URIHandler::static_type().to_glib(), protocols as *mut _));
uri_handler_iface.get_type = Some(uri_handler_get_type::<T>);
uri_handler_iface.get_protocols = Some(uri_handler_get_protocols::<T>);
uri_handler_iface.get_uri = Some(uri_handler_get_uri::<T>);
uri_handler_iface.set_uri = Some(uri_handler_set_uri::<T>);
}
}
unsafe extern "C" fn uri_handler_get_type<T: URIHandlerImpl>(
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_type_: glib_sys::GType,
) -> gst_sys::GstURIType {
<T as URIHandlerImpl>::get_uri_type().to_glib()
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}
unsafe extern "C" fn uri_handler_get_protocols<T: URIHandlerImpl>(
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_type_: glib_sys::GType,
) -> *const *const libc::c_char {
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let data = <T as ObjectSubclass>::type_data();
data.as_ref()
.get_interface_data(URIHandler::static_type().to_glib()) as *const _
}
unsafe extern "C" fn uri_handler_get_uri<T: URIHandlerImpl>(
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uri_handler: *mut gst_sys::GstURIHandler,
) -> *mut libc::c_char {
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let instance = &*(uri_handler as *mut T::Instance);
let imp = instance.get_impl();
imp.get_uri(&from_glib_borrow(uri_handler)).to_glib_full()
}
unsafe extern "C" fn uri_handler_set_uri<T: URIHandlerImpl>(
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uri_handler: *mut gst_sys::GstURIHandler,
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uri: *const libc::c_char,
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err: *mut *mut glib_sys::GError,
) -> glib_sys::gboolean {
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let instance = &*(uri_handler as *mut T::Instance);
let imp = instance.get_impl();
match imp.set_uri(
&from_glib_borrow(uri_handler),
glib::GString::from_glib_borrow(uri).as_str(),
) {
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Ok(()) => true.to_glib(),
Err(error) => {
*err = error.to_glib_full() as *mut _;
false.to_glib()
}
}
}