mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer-rs.git
synced 2024-05-19 16:58:22 +00:00
129 lines
4.2 KiB
Rust
129 lines
4.2 KiB
Rust
// Take a look at the license at the top of the repository in the LICENSE file.
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use std::ptr;
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use glib::{prelude::*, subclass::prelude::*, translate::*};
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use super::prelude::*;
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use crate::{Device, Element, LoggableError};
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pub trait DeviceImpl: DeviceImplExt + GstObjectImpl + Send + Sync {
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fn create_element(&self, name: Option<&str>) -> Result<Element, LoggableError> {
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self.parent_create_element(name)
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}
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fn reconfigure_element(&self, element: &Element) -> Result<(), LoggableError> {
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self.parent_reconfigure_element(element)
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}
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}
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mod sealed {
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pub trait Sealed {}
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impl<T: super::DeviceImplExt> Sealed for T {}
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}
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pub trait DeviceImplExt: sealed::Sealed + ObjectSubclass {
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fn parent_create_element(&self, name: Option<&str>) -> Result<Element, LoggableError> {
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unsafe {
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let data = Self::type_data();
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let parent_class = data.as_ref().parent_class() as *mut ffi::GstDeviceClass;
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if let Some(f) = (*parent_class).create_element {
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let ptr = f(
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self.obj().unsafe_cast_ref::<Device>().to_glib_none().0,
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name.to_glib_none().0,
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);
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// Don't steal floating reference here but pass it further to the caller
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Option::<_>::from_glib_full(ptr).ok_or_else(|| {
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loggable_error!(
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crate::CAT_RUST,
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"Failed to create element using the parent function"
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)
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})
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} else {
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Err(loggable_error!(
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crate::CAT_RUST,
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"Parent function `create_element` is not defined"
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))
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}
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}
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}
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fn parent_reconfigure_element(&self, element: &Element) -> Result<(), LoggableError> {
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unsafe {
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let data = Self::type_data();
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let parent_class = data.as_ref().parent_class() as *mut ffi::GstDeviceClass;
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let f = (*parent_class).reconfigure_element.ok_or_else(|| {
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loggable_error!(
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crate::CAT_RUST,
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"Parent function `reconfigure_element` is not defined"
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)
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})?;
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result_from_gboolean!(
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f(
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self.obj().unsafe_cast_ref::<Device>().to_glib_none().0,
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element.to_glib_none().0
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),
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crate::CAT_RUST,
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"Failed to reconfigure the element using the parent function"
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)
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}
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}
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}
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impl<T: DeviceImpl> DeviceImplExt for T {}
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unsafe impl<T: DeviceImpl> IsSubclassable<T> for Device {
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fn class_init(klass: &mut glib::Class<Self>) {
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Self::parent_class_init::<T>(klass);
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let klass = klass.as_mut();
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klass.create_element = Some(device_create_element::<T>);
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klass.reconfigure_element = Some(device_reconfigure_element::<T>);
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}
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}
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unsafe extern "C" fn device_create_element<T: DeviceImpl>(
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ptr: *mut ffi::GstDevice,
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name: *const libc::c_char,
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) -> *mut ffi::GstElement {
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let instance = &*(ptr as *mut T::Instance);
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let imp = instance.imp();
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match imp.create_element(
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Option::<glib::GString>::from_glib_borrow(name)
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.as_ref()
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.as_ref()
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.map(|s| s.as_str()),
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) {
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Ok(element) => {
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// The reference we're going to return, the initial reference is going to
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// be dropped here now
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let element = element.into_glib_ptr();
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// See https://gitlab.freedesktop.org/gstreamer/gstreamer/issues/444
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glib::gobject_ffi::g_object_force_floating(element as *mut glib::gobject_ffi::GObject);
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element
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}
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Err(err) => {
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err.log_with_imp(imp);
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ptr::null_mut()
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}
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}
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}
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unsafe extern "C" fn device_reconfigure_element<T: DeviceImpl>(
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ptr: *mut ffi::GstDevice,
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element: *mut ffi::GstElement,
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) -> glib::ffi::gboolean {
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let instance = &*(ptr as *mut T::Instance);
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let imp = instance.imp();
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match imp.reconfigure_element(&from_glib_borrow(element)) {
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Ok(()) => true,
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Err(err) => {
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err.log_with_imp(imp);
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false
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}
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}
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.into_glib()
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}
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