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Move subclassing infrastructure into the main bindings

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And port Element bindings to the new infrastructure.
This commit is contained in:
Sebastian Dröge 2018-11-18 14:20:16 +02:00
parent d6ce094cfd
commit 56319f9294
9 changed files with 691 additions and 35 deletions
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1
Gir_Gst.toml
View file

@ -312,6 +312,7 @@ status = "generate"
[[object]]
name = "Gst.Element"
subclassing = true
status = "generate"
[[object.function]]
name = "make_from_uri"

1
gstreamer/Cargo.toml
View file

@ -47,6 +47,7 @@ dox = ["gstreamer-sys/dox", "glib/dox", "futures", "ser_de"]
futures = ["futures-core-preview"]
ser_de = ["num-rational/serde", "serde", "serde_bytes", "serde_derive"]
default-features = []
subclassing = ["glib/subclassing"]
[badges]
gitlab = { repository = "https://gitlab.freedesktop.org/gstreamer/gstreamer-rs", branch = "master" }

4
gstreamer/src/auto/element.rs
View file

@ -33,8 +33,10 @@ use std::mem;
use std::mem::transmute;
use std::ptr;
use ElementClass;
glib_wrapper! {
pub struct Element(Object<ffi::GstElement, ffi::GstElementClass>): Object;
pub struct Element(Object<ffi::GstElement, ffi::GstElementClass, ElementClass>): Object;
match fn {
get_type => || ffi::gst_element_get_type(),

106
gstreamer/src/element.rs
View file

@ -16,7 +16,7 @@ use glib::translate::FromGlibPtrBorrow;
use glib::translate::{
from_glib, from_glib_full, from_glib_none, FromGlib, FromGlibPtrContainer, ToGlib, ToGlibPtr,
};
use glib::IsA;
use glib::{IsA, IsClassFor};
use miniobject::MiniObject;
use Event;
use Format;
@ -29,6 +29,7 @@ use SpecificFormattedValue;
use std::ffi::CStr;
use std::mem;
use std::ops;
use libc;
@ -92,6 +93,8 @@ impl FromGlib<libc::c_ulong> for NotifyWatchId {
}
pub trait ElementExtManual {
fn get_element_class(&self) -> &ElementClass;
fn query(&self, query: &mut QueryRef) -> bool;
fn send_event(&self, event: Event) -> bool;
@ -192,6 +195,14 @@ pub trait ElementExtManual {
}
impl<O: IsA<Element>> ElementExtManual for O {
fn get_element_class(&self) -> &ElementClass {
unsafe {
let klass = (*(self.to_glib_none().0 as *mut gobject_ffi::GTypeInstance)).g_class
as *const ElementClass;
&*klass
}
}
fn query(&self, query: &mut QueryRef) -> bool {
unsafe {
from_glib(ffi::gst_element_query(
@ -211,41 +222,15 @@ impl<O: IsA<Element>> ElementExtManual for O {
}
fn get_metadata<'a>(&self, key: &str) -> Option<&'a str> {
unsafe {
let klass = (*(self.to_glib_none().0 as *mut gobject_ffi::GTypeInstance)).g_class
as *mut ffi::GstElementClass;
let ptr = ffi::gst_element_class_get_metadata(klass, key.to_glib_none().0);
if ptr.is_null() {
None
} else {
Some(CStr::from_ptr(ptr).to_str().unwrap())
}
}
self.get_element_class().get_metadata(key)
}
fn get_pad_template(&self, name: &str) -> Option<PadTemplate> {
unsafe {
let klass = (*(self.to_glib_none().0 as *mut gobject_ffi::GTypeInstance)).g_class
as *mut ffi::GstElementClass;
from_glib_none(ffi::gst_element_class_get_pad_template(
klass,
name.to_glib_none().0,
))
}
self.get_element_class().get_pad_template(name)
}
fn get_pad_template_list(&self) -> Vec<PadTemplate> {
unsafe {
let klass = (*(self.to_glib_none().0 as *mut gobject_ffi::GTypeInstance)).g_class
as *mut ffi::GstElementClass;
FromGlibPtrContainer::from_glib_none(ffi::gst_element_class_get_pad_template_list(
klass,
))
}
self.get_element_class().get_pad_template_list()
}
fn message_full<T: ::MessageErrorDomain>(
@ -614,6 +599,67 @@ impl<O: IsA<Element>> ElementExtManual for O {
}
}
#[repr(C)]
pub struct ElementClass(ffi::GstElementClass);
unsafe impl IsClassFor for ElementClass {
type Instance = ::Element;
}
unsafe impl Send for ElementClass {}
unsafe impl Sync for ElementClass {}
impl ops::Deref for ElementClass {
type Target = glib::ObjectClass;
fn deref(&self) -> &Self::Target {
self.upcast_ref()
}
}
impl ops::DerefMut for ElementClass {
fn deref_mut(&mut self) -> &mut Self::Target {
self.upcast_ref_mut()
}
}
impl ElementClass {
pub fn get_metadata<'a>(&self, key: &str) -> Option<&'a str> {
unsafe {
let klass = self as *const _ as *const ffi::GstElementClass;
let ptr = ffi::gst_element_class_get_metadata(klass as *mut _, key.to_glib_none().0);
if ptr.is_null() {
None
} else {
Some(CStr::from_ptr(ptr).to_str().unwrap())
}
}
}
pub fn get_pad_template(&self, name: &str) -> Option<PadTemplate> {
unsafe {
let klass = self as *const _ as *const ffi::GstElementClass;
from_glib_none(ffi::gst_element_class_get_pad_template(
klass as *mut _,
name.to_glib_none().0,
))
}
}
pub fn get_pad_template_list(&self) -> Vec<PadTemplate> {
unsafe {
let klass = self as *const _ as *const ffi::GstElementClass;
FromGlibPtrContainer::from_glib_none(ffi::gst_element_class_get_pad_template_list(
klass as *mut _,
))
}
}
}
lazy_static! {
pub static ref ELEMENT_METADATA_AUTHOR: &'static str = unsafe {
CStr::from_ptr(ffi::GST_ELEMENT_METADATA_AUTHOR)

18
gstreamer/src/lib.rs
View file

@ -16,12 +16,17 @@ extern crate cfg_if;
extern crate lazy_static;
extern crate libc;
extern crate glib_sys as glib_ffi;
extern crate gobject_sys as gobject_ffi;
extern crate gstreamer_sys as ffi;
// Re-exported for the subclass gst_plugin_define! macro
#[doc(hidden)]
pub extern crate glib_sys as glib_ffi;
#[doc(hidden)]
pub extern crate gobject_sys as gobject_ffi;
#[doc(hidden)]
pub extern crate gstreamer_sys as ffi;
#[macro_use]
extern crate glib;
#[doc(hidden)]
pub extern crate glib;
extern crate num_rational;
@ -143,6 +148,7 @@ pub use promise::*;
mod bin;
mod bus;
mod element;
pub use element::ElementClass;
// OS dependent Bus extensions (also import the other plateform mod for doc)
#[cfg(any(feature = "v1_14", feature = "dox"))]
@ -330,3 +336,7 @@ pub mod prelude {
}
mod utils;
#[macro_use]
#[cfg(feature = "subclassing")]
pub mod subclass;

365
gstreamer/src/subclass/element.rs Normal file
View file

@ -0,0 +1,365 @@
// 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.
use libc;
use ffi;
use glib_ffi;
use super::prelude::*;
use glib;
use glib::prelude::*;
use glib::subclass::prelude::*;
use glib::translate::*;
use prelude::*;
use Element;
use ElementClass;
use Event;
use PadTemplate;
use QueryRef;
use StateChange;
use StateChangeReturn;
pub trait ElementImpl: ObjectImpl + Send + Sync + 'static {
fn change_state(&self, element: &::Element, transition: StateChange) -> StateChangeReturn {
self.parent_change_state(element, transition)
}
fn request_new_pad(
&self,
_element: &::Element,
_templ: &::PadTemplate,
_name: Option<String>,
_caps: Option<&::CapsRef>,
) -> Option<::Pad> {
None
}
fn release_pad(&self, _element: &::Element, _pad: &::Pad) {}
fn send_event(&self, element: &::Element, event: Event) -> bool {
self.parent_send_event(element, event)
}
fn query(&self, element: &::Element, query: &mut QueryRef) -> bool {
self.parent_query(element, query)
}
fn set_context(&self, element: &::Element, context: &::Context) {
self.parent_set_context(element, context)
}
fn parent_change_state(
&self,
element: &::Element,
transition: StateChange,
) -> StateChangeReturn {
unsafe {
let data = self.get_type_data();
let parent_class = data.as_ref().get_parent_class() as *mut ffi::GstElementClass;
(*parent_class)
.change_state
.map(|f| from_glib(f(element.to_glib_none().0, transition.to_glib())))
.unwrap_or(::StateChangeReturn::Success)
}
}
fn parent_send_event(&self, element: &::Element, event: Event) -> bool {
unsafe {
let data = self.get_type_data();
let parent_class = data.as_ref().get_parent_class() as *mut ffi::GstElementClass;
(*parent_class)
.send_event
.map(|f| from_glib(f(element.to_glib_none().0, event.into_ptr())))
.unwrap_or(false)
}
}
fn parent_query(&self, element: &::Element, query: &mut QueryRef) -> bool {
unsafe {
let data = self.get_type_data();
let parent_class = data.as_ref().get_parent_class() as *mut ffi::GstElementClass;
(*parent_class)
.query
.map(|f| from_glib(f(element.to_glib_none().0, query.as_mut_ptr())))
.unwrap_or(false)
}
}
fn parent_set_context(&self, element: &::Element, context: &::Context) {
unsafe {
let data = self.get_type_data();
let parent_class = data.as_ref().get_parent_class() as *mut ffi::GstElementClass;
(*parent_class)
.set_context
.map(|f| f(element.to_glib_none().0, context.to_glib_none().0))
.unwrap_or(())
}
}
}
pub trait ElementImplExt {
fn catch_panic<
R,
F: FnOnce(&Self) -> R,
G: FnOnce() -> R,
P: IsA<::Element> + IsA<glib::Object> + glib::value::SetValue,
>(
&self,
element: &P,
fallback: G,
f: F,
) -> R;
fn catch_panic_pad_function<R, F: FnOnce(&Self, &::Element) -> R, G: FnOnce() -> R>(
parent: &Option<::Object>,
fallback: G,
f: F,
) -> R;
}
impl<T: ElementImpl + ObjectSubclass> ElementImplExt for T
where
T::Instance: PanicPoison,
{
fn catch_panic<
R,
F: FnOnce(&Self) -> R,
G: FnOnce() -> R,
P: IsA<::Element> + IsA<glib::Object> + glib::value::SetValue,
>(
&self,
element: &P,
fallback: G,
f: F,
) -> R {
unsafe {
assert!(element.get_type().is_a(&T::static_type()));
let ptr: *mut ffi::GstElement = element.to_glib_none().0;
let instance = &*(ptr as *mut T::Instance);
let imp = instance.get_impl();
gst_panic_to_error!(element, &instance.panicked(), fallback(), { f(&imp) })
}
}
fn catch_panic_pad_function<R, F: FnOnce(&Self, &::Element) -> R, G: FnOnce() -> R>(
parent: &Option<::Object>,
fallback: G,
f: F,
) -> R {
unsafe {
let wrap = parent
.as_ref()
.unwrap()
.downcast_ref::<::Element>()
.unwrap();
assert!(wrap.get_type().is_a(&T::static_type()));
let ptr: *mut ffi::GstElement = wrap.to_glib_none().0;
let instance = &*(ptr as *mut T::Instance);
let imp = instance.get_impl();
gst_panic_to_error!(wrap, &instance.panicked(), fallback(), { f(&imp, &wrap) })
}
}
}
pub unsafe trait ElementClassSubclassExt: Sized + 'static {
fn add_pad_template(&mut self, pad_template: PadTemplate) {
unsafe {
ffi::gst_element_class_add_pad_template(
self as *const Self as *mut ffi::GstElementClass,
pad_template.to_glib_none().0,
);
}
}
fn set_metadata(
&mut self,
long_name: &str,
classification: &str,
description: &str,
author: &str,
) {
unsafe {
ffi::gst_element_class_set_metadata(
self as *const Self as *mut ffi::GstElementClass,
long_name.to_glib_none().0,
classification.to_glib_none().0,
description.to_glib_none().0,
author.to_glib_none().0,
);
}
}
}
unsafe impl ElementClassSubclassExt for ElementClass {}
unsafe impl<T: ObjectSubclass + ElementImpl> IsSubclassable<T> for ElementClass
where
<T as ObjectSubclass>::Instance: PanicPoison,
{
fn override_vfuncs(&mut self) {
<glib::ObjectClass as IsSubclassable<T>>::override_vfuncs(self);
unsafe {
let klass = &mut *(self as *const Self as *mut ffi::GstElementClass);
klass.change_state = Some(element_change_state::<T>);
klass.request_new_pad = Some(element_request_new_pad::<T>);
klass.release_pad = Some(element_release_pad::<T>);
klass.send_event = Some(element_send_event::<T>);
klass.query = Some(element_query::<T>);
klass.set_context = Some(element_set_context::<T>);
}
}
}
unsafe extern "C" fn element_change_state<T: ObjectSubclass>(
ptr: *mut ffi::GstElement,
transition: ffi::GstStateChange,
) -> ffi::GstStateChangeReturn
where
T: ElementImpl,
T::Instance: PanicPoison,
{
glib_floating_reference_guard!(ptr);
let instance = &*(ptr as *mut T::Instance);
let imp = instance.get_impl();
let wrap: Element = from_glib_borrow(ptr);
// *Never* fail downwards state changes, this causes bugs in GStreamer
// and leads to crashes and deadlocks.
let transition = from_glib(transition);
let fallback = match transition {
StateChange::PlayingToPaused | StateChange::PausedToReady | StateChange::ReadyToNull => {
StateChangeReturn::Success
}
_ => StateChangeReturn::Failure,
};
gst_panic_to_error!(&wrap, &instance.panicked(), fallback, {
imp.change_state(&wrap, transition)
})
.to_glib()
}
unsafe extern "C" fn element_request_new_pad<T: ObjectSubclass>(
ptr: *mut ffi::GstElement,
templ: *mut ffi::GstPadTemplate,
name: *const libc::c_char,
caps: *const ffi::GstCaps,
) -> *mut ffi::GstPad
where
T: ElementImpl,
T::Instance: PanicPoison,
{
glib_floating_reference_guard!(ptr);
let instance = &*(ptr as *mut T::Instance);
let imp = instance.get_impl();
let wrap: Element = from_glib_borrow(ptr);
let caps = if caps.is_null() {
None
} else {
Some(::CapsRef::from_ptr(caps))
};
// XXX: This is effectively unsafe but the best we can do
// See https://bugzilla.gnome.org/show_bug.cgi?id=791193
let pad = gst_panic_to_error!(&wrap, &instance.panicked(), None, {
imp.request_new_pad(&wrap, &from_glib_borrow(templ), from_glib_none(name), caps)
});
// Ensure that the pad is owned by the element now, if a pad was returned
if let Some(ref pad) = pad {
assert_eq!(
pad.get_parent(),
Some(::Object::from_glib_borrow(ptr as *mut ffi::GstObject))
);
}
pad.to_glib_none().0
}
unsafe extern "C" fn element_release_pad<T: ObjectSubclass>(
ptr: *mut ffi::GstElement,
pad: *mut ffi::GstPad,
) where
T: ElementImpl,
T::Instance: PanicPoison,
{
glib_floating_reference_guard!(ptr);
let instance = &*(ptr as *mut T::Instance);
let imp = instance.get_impl();
let wrap: Element = from_glib_borrow(ptr);
gst_panic_to_error!(&wrap, &instance.panicked(), (), {
imp.release_pad(&wrap, &from_glib_borrow(pad))
})
}
unsafe extern "C" fn element_send_event<T: ObjectSubclass>(
ptr: *mut ffi::GstElement,
event: *mut ffi::GstEvent,
) -> glib_ffi::gboolean
where
T: ElementImpl,
T::Instance: PanicPoison,
{
glib_floating_reference_guard!(ptr);
let instance = &*(ptr as *mut T::Instance);
let imp = instance.get_impl();
let wrap: Element = from_glib_borrow(ptr);
gst_panic_to_error!(&wrap, &instance.panicked(), false, {
imp.send_event(&wrap, from_glib_full(event))
})
.to_glib()
}
unsafe extern "C" fn element_query<T: ObjectSubclass>(
ptr: *mut ffi::GstElement,
query: *mut ffi::GstQuery,
) -> glib_ffi::gboolean
where
T: ElementImpl,
T::Instance: PanicPoison,
{
glib_floating_reference_guard!(ptr);
let instance = &*(ptr as *mut T::Instance);
let imp = instance.get_impl();
let wrap: Element = from_glib_borrow(ptr);
let query = QueryRef::from_mut_ptr(query);
gst_panic_to_error!(&wrap, &instance.panicked(), false, {
imp.query(&wrap, query)
})
.to_glib()
}
unsafe extern "C" fn element_set_context<T: ObjectSubclass>(
ptr: *mut ffi::GstElement,
context: *mut ffi::GstContext,
) where
T: ElementImpl,
T::Instance: PanicPoison,
{
glib_floating_reference_guard!(ptr);
let instance = &*(ptr as *mut T::Instance);
let imp = instance.get_impl();
let wrap: Element = from_glib_borrow(ptr);
gst_panic_to_error!(&wrap, &instance.panicked(), (), {
imp.set_context(&wrap, &from_glib_borrow(context))
})
}

93
gstreamer/src/subclass/error.rs Normal file
View file

@ -0,0 +1,93 @@
// Copyright (C) 2016-2018 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 std::error::Error;
use std::fmt::Error as FmtError;
use std::fmt::{Display, Formatter};
use ErrorMessage;
use FlowReturn;
#[macro_export]
macro_rules! gst_panic_to_error(
($element:expr, $panicked:expr, $ret:expr, $code:block) => {{
use std::panic::{self, AssertUnwindSafe};
use std::sync::atomic::Ordering;
use $crate::ElementExtManual;
if $panicked.load(Ordering::Relaxed) {
$element.post_error_message(&gst_error_msg!($crate::LibraryError::Failed, ["Panicked"]));
$ret
} else {
let result = panic::catch_unwind(AssertUnwindSafe(|| $code));
match result {
Ok(result) => result,
Err(err) => {
$panicked.store(true, Ordering::Relaxed);
if let Some(cause) = err.downcast_ref::<&str>() {
$element.post_error_message(&gst_error_msg!($crate::LibraryError::Failed, ["Panicked: {}", cause]));
} else if let Some(cause) = err.downcast_ref::<String>() {
$element.post_error_message(&gst_error_msg!($crate::LibraryError::Failed, ["Panicked: {}", cause]));
} else {
$element.post_error_message(&gst_error_msg!($crate::LibraryError::Failed, ["Panicked"]));
}
$ret
}
}
}
}};
);
#[derive(Clone, Debug, PartialEq, Eq)]
pub enum FlowError {
Flushing,
Eos,
NotNegotiated(ErrorMessage),
Error(ErrorMessage),
}
impl From<FlowError> for FlowReturn {
fn from(err: FlowError) -> Self {
FlowReturn::from(&err)
}
}
impl<'a> From<&'a FlowError> for FlowReturn {
fn from(err: &FlowError) -> FlowReturn {
match *err {
FlowError::Flushing => FlowReturn::Flushing,
FlowError::Eos => FlowReturn::Eos,
FlowError::NotNegotiated(..) => FlowReturn::NotNegotiated,
FlowError::Error(..) => FlowReturn::Error,
}
}
}
impl Display for FlowError {
fn fmt(&self, f: &mut Formatter) -> Result<(), FmtError> {
match *self {
FlowError::Flushing | FlowError::Eos => f.write_str(self.description()),
FlowError::NotNegotiated(ref m) => {
f.write_fmt(format_args!("{}: {}", self.description(), m))
}
FlowError::Error(ref m) => f.write_fmt(format_args!("{}: {}", self.description(), m)),
}
}
}
impl Error for FlowError {
fn description(&self) -> &str {
match *self {
FlowError::Flushing => "Flushing",
FlowError::Eos => "Eos",
FlowError::NotNegotiated(..) => "Not Negotiated",
FlowError::Error(..) => "Error",
}
}
}

46
gstreamer/src/subclass/mod.rs Normal file
View file

@ -0,0 +1,46 @@
// Copyright (C) 2016-2018 Sebastian Dröge <sebastian@centricular.com>
// 2016 Luis de Bethencourt <luisbg@osg.samsung.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.
#![cfg_attr(feature = "cargo-clippy", allow(cast_ptr_alignment))]
#[macro_use]
pub mod error;
#[macro_use]
pub mod plugin;
pub mod element;
pub mod prelude {
pub use super::element::{ElementClassSubclassExt, ElementImpl, ElementImplExt};
pub use super::PanicPoison;
pub use glib::subclass::prelude::*;
}
use self::prelude::*;
use glib;
use std::sync::atomic::AtomicBool;
#[repr(C)]
pub struct ElementInstanceStruct<T: ObjectSubclass> {
parent: <T::ParentType as glib::wrapper::Wrapper>::GlibType,
panicked: AtomicBool,
}
unsafe impl<T: ObjectSubclass> InstanceStruct for ElementInstanceStruct<T> {
type Type = T;
}
pub trait PanicPoison {
fn panicked(&self) -> &AtomicBool;
}
impl<T: ObjectSubclass> PanicPoison for ElementInstanceStruct<T> {
fn panicked(&self) -> &AtomicBool {
&self.panicked
}
}

92
gstreamer/src/subclass/plugin.rs Normal file
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@ -0,0 +1,92 @@
// Copyright (C) 2016-2018 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.
#[macro_export]
macro_rules! gst_plugin_define(
($name:expr, $description:expr, $plugin_init:ident,
$version:expr, $license:expr, $source:expr,
$package:expr, $origin:expr, $release_datetime:expr) => {
pub mod plugin_desc {
use $crate::glib::translate::{from_glib_borrow, ToGlib, from_glib};
const MAJOR_VERSION: i32 = 1;
const MINOR_VERSION: i32 = 8;
// Not using c_char here because it requires the libc crate
#[allow(non_camel_case_types)]
type c_char = i8;
#[repr(C)]
pub struct GstPluginDesc($crate::ffi::GstPluginDesc);
unsafe impl Sync for GstPluginDesc {}
#[no_mangle]
#[allow(non_upper_case_globals)]
pub static gst_plugin_desc: GstPluginDesc = GstPluginDesc($crate::ffi::GstPluginDesc {
major_version: MAJOR_VERSION,
minor_version: MINOR_VERSION,
name: $name as *const u8 as *const c_char,
description: $description as *const u8 as *const c_char,
plugin_init: Some(plugin_init_trampoline),
version: $version as *const u8 as *const c_char,
license: $license as *const u8 as *const c_char,
source: $source as *const u8 as *const c_char,
package: $package as *const u8 as *const c_char,
origin: $origin as *const u8 as *const c_char,
release_datetime: $release_datetime as *const u8 as *const c_char,
_gst_reserved: [0 as $crate::glib_ffi::gpointer; 4],
});
pub fn plugin_register_static() -> bool {
unsafe {
from_glib($crate::ffi::gst_plugin_register_static(
MAJOR_VERSION,
MINOR_VERSION,
$name as *const u8 as *const c_char,
$description as *const u8 as *const c_char,
Some(plugin_init_trampoline),
$version as *const u8 as *const c_char,
$license as *const u8 as *const c_char,
$source as *const u8 as *const c_char,
$package as *const u8 as *const c_char,
$origin as *const u8 as *const c_char,
))
}
}
unsafe extern "C" fn plugin_init_trampoline(plugin: *mut $crate::ffi::GstPlugin) -> $crate::glib_ffi::gboolean {
use std::panic::{self, AssertUnwindSafe};
let panic_result = panic::catch_unwind(AssertUnwindSafe(|| super::$plugin_init(&from_glib_borrow(plugin))));
match panic_result {
Ok(register_result) => match register_result {
Ok(_) => $crate::glib_ffi::GTRUE,
Err(err) => {
let cat = $crate::DebugCategory::get("GST_PLUGIN_LOADING").unwrap();
gst_error!(cat, "Failed to register plugin: {}", err);
$crate::glib_ffi::GFALSE
}
}
Err(err) => {
let cat = $crate::DebugCategory::get("GST_PLUGIN_LOADING").unwrap();
if let Some(cause) = err.downcast_ref::<&str>() {
gst_error!(cat, "Failed to initialize plugin due to panic: {}", cause);
} else if let Some(cause) = err.downcast_ref::<String>() {
gst_error!(cat, "Failed to initialize plugin due to panic: {}", cause);
} else {
gst_error!(cat, "Failed to initialize plugin due to panic");
}
$crate::glib_ffi::GFALSE
}
}
}
}
pub use plugin_desc::plugin_register_static;
};
);