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use glib::prelude::*;
use glib::subclass::prelude::*;
use glib::translate::*;
use crate::Device;
use crate::DeviceProvider;
use crate::LoggableError;
#[derive(Debug, Clone)]
pub struct DeviceProviderMetadata {
long_name: String,
classification: String,
description: String,
author: String,
additional: Vec<(String, String)>,
}
pub trait DeviceProviderImpl: DeviceProviderImplExt + ObjectImpl + Send + Sync {
fn metadata() -> Option<&'static DeviceProviderMetadata> {
None
}
fn probe(&self, device_provider: &Self::Type) -> Vec<Device> {
self.parent_probe(device_provider)
}
fn start(&self, device_provider: &Self::Type) -> Result<(), LoggableError> {
self.parent_start(device_provider)
}
fn stop(&self, device_provider: &Self::Type) {
self.parent_stop(device_provider)
}
}
pub trait DeviceProviderImplExt: ObjectSubclass {
fn parent_probe(&self, device_provider: &Self::Type) -> Vec<Device>;
fn parent_start(&self, device_provider: &Self::Type) -> Result<(), LoggableError>;
fn parent_stop(&self, device_provider: &Self::Type);
}
impl<T: DeviceProviderImpl> DeviceProviderImplExt for T {
fn parent_probe(&self, device_provider: &Self::Type) -> Vec<Device> {
unsafe {
let data = Self::type_data();
let parent_class = data.as_ref().parent_class() as *mut ffi::GstDeviceProviderClass;
if let Some(f) = (*parent_class).probe {
FromGlibPtrContainer::from_glib_full(f(device_provider
.unsafe_cast_ref::<DeviceProvider>()
.to_glib_none()
.0))
} else {
Vec::new()
}
}
}
fn parent_start(&self, device_provider: &Self::Type) -> Result<(), LoggableError> {
unsafe {
let data = Self::type_data();
let parent_class = data.as_ref().parent_class() as *mut ffi::GstDeviceProviderClass;
let f = (*parent_class).start.ok_or_else(|| {
loggable_error!(crate::CAT_RUST, "Parent function `start` is not defined")
})?;
result_from_gboolean!(
f(device_provider
.unsafe_cast_ref::<DeviceProvider>()
.to_glib_none()
.0),
crate::CAT_RUST,
"Failed to start the device provider using the parent function"
)
}
}
fn parent_stop(&self, device_provider: &Self::Type) {
unsafe {
let data = Self::type_data();
let parent_class = data.as_ref().parent_class() as *mut ffi::GstDeviceProviderClass;
if let Some(f) = (*parent_class).stop {
f(device_provider
.unsafe_cast_ref::<DeviceProvider>()
.to_glib_none()
.0);
}
}
}
}
unsafe impl<T: DeviceProviderImpl> IsSubclassable<T> for DeviceProvider {
fn class_init(klass: &mut glib::Class<Self>) {
<glib::Object as IsSubclassable<T>>::class_init(klass);
let klass = klass.as_mut();
klass.probe = Some(device_provider_probe::<T>);
klass.start = Some(device_provider_start::<T>);
klass.stop = Some(device_provider_stop::<T>);
unsafe {
if let Some(metadata) = T::metadata() {
ffi::gst_device_provider_class_set_metadata(
klass,
metadata.long_name.to_glib_none().0,
metadata.classification.to_glib_none().0,
metadata.description.to_glib_none().0,
metadata.author.to_glib_none().0,
);
for (key, value) in &metadata.additional {
ffi::gst_device_provider_class_add_metadata(
klass,
key.to_glib_none().0,
value.to_glib_none().0,
);
}
}
}
}
fn instance_init(instance: &mut glib::subclass::InitializingObject<T>) {
<glib::Object as IsSubclassable<T>>::instance_init(instance);
}
}
unsafe extern "C" fn device_provider_probe<T: DeviceProviderImpl>(
ptr: *mut ffi::GstDeviceProvider,
) -> *mut glib::ffi::GList {
let instance = &*(ptr as *mut T::Instance);
let imp = instance.impl_();
let wrap: Borrowed<DeviceProvider> = from_glib_borrow(ptr);
imp.probe(wrap.unsafe_cast_ref()).to_glib_full()
}
unsafe extern "C" fn device_provider_start<T: DeviceProviderImpl>(
ptr: *mut ffi::GstDeviceProvider,
) -> glib::ffi::gboolean {
let instance = &*(ptr as *mut T::Instance);
let imp = instance.impl_();
let wrap: Borrowed<DeviceProvider> = from_glib_borrow(ptr);
match imp.start(wrap.unsafe_cast_ref()) {
Ok(()) => true,
Err(err) => {
err.log_with_object(&*wrap);
false
}
}
.into_glib()
}
unsafe extern "C" fn device_provider_stop<T: DeviceProviderImpl>(ptr: *mut ffi::GstDeviceProvider) {
let instance = &*(ptr as *mut T::Instance);
let imp = instance.impl_();
let wrap: Borrowed<DeviceProvider> = from_glib_borrow(ptr);
imp.stop(wrap.unsafe_cast_ref());
}