mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer-rs.git
synced 2024-09-24 13:00:27 +00:00
90b8ee2022
It's doing the same thing and is shorter.
208 lines
6.1 KiB
Rust
208 lines
6.1 KiB
Rust
// Take a look at the license at the top of the repository in the LICENSE file.
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use super::prelude::*;
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use glib::prelude::*;
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use glib::subclass::prelude::*;
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use glib::translate::*;
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use std::borrow::Cow;
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use crate::Device;
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use crate::DeviceProvider;
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use crate::LoggableError;
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#[derive(Debug, Clone)]
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pub struct DeviceProviderMetadata {
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long_name: Cow<'static, str>,
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classification: Cow<'static, str>,
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description: Cow<'static, str>,
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author: Cow<'static, str>,
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additional: Cow<'static, [(Cow<'static, str>, Cow<'static, str>)]>,
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}
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impl DeviceProviderMetadata {
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pub fn new(long_name: &str, classification: &str, description: &str, author: &str) -> Self {
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Self {
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long_name: Cow::Owned(long_name.into()),
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classification: Cow::Owned(classification.into()),
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description: Cow::Owned(description.into()),
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author: Cow::Owned(author.into()),
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additional: Cow::Borrowed(&[]),
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}
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}
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pub fn with_additional(
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long_name: &str,
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classification: &str,
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description: &str,
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author: &str,
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additional: &[(&str, &str)],
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) -> Self {
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Self {
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long_name: Cow::Owned(long_name.into()),
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classification: Cow::Owned(classification.into()),
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description: Cow::Owned(description.into()),
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author: Cow::Owned(author.into()),
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additional: additional
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.iter()
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.copied()
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.map(|(key, value)| (Cow::Owned(key.into()), Cow::Owned(value.into())))
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.collect(),
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}
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}
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pub const fn with_cow(
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long_name: Cow<'static, str>,
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classification: Cow<'static, str>,
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description: Cow<'static, str>,
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author: Cow<'static, str>,
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additional: Cow<'static, [(Cow<'static, str>, Cow<'static, str>)]>,
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) -> Self {
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Self {
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long_name,
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classification,
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description,
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author,
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additional,
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}
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}
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}
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pub trait DeviceProviderImpl: DeviceProviderImplExt + GstObjectImpl + Send + Sync {
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fn metadata() -> Option<&'static DeviceProviderMetadata> {
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None
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}
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fn probe(&self) -> Vec<Device> {
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self.parent_probe()
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}
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fn start(&self) -> Result<(), LoggableError> {
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self.parent_start()
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}
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fn stop(&self) {
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self.parent_stop()
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}
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}
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pub trait DeviceProviderImplExt: ObjectSubclass {
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fn parent_probe(&self) -> Vec<Device>;
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fn parent_start(&self) -> Result<(), LoggableError>;
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fn parent_stop(&self);
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}
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impl<T: DeviceProviderImpl> DeviceProviderImplExt for T {
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fn parent_probe(&self) -> Vec<Device> {
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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::GstDeviceProviderClass;
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if let Some(f) = (*parent_class).probe {
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FromGlibPtrContainer::from_glib_full(f(self
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.obj()
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.unsafe_cast_ref::<DeviceProvider>()
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.to_glib_none()
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.0))
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} else {
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Vec::new()
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}
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}
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}
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fn parent_start(&self) -> 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::GstDeviceProviderClass;
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let f = (*parent_class).start.ok_or_else(|| {
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loggable_error!(crate::CAT_RUST, "Parent function `start` is not defined")
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})?;
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result_from_gboolean!(
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f(self
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.obj()
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.unsafe_cast_ref::<DeviceProvider>()
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.to_glib_none()
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.0),
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crate::CAT_RUST,
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"Failed to start the device provider using the parent function"
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)
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}
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}
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fn parent_stop(&self) {
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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::GstDeviceProviderClass;
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if let Some(f) = (*parent_class).stop {
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f(self
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.obj()
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.unsafe_cast_ref::<DeviceProvider>()
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.to_glib_none()
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.0);
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}
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}
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}
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}
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unsafe impl<T: DeviceProviderImpl> IsSubclassable<T> for DeviceProvider {
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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.probe = Some(device_provider_probe::<T>);
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klass.start = Some(device_provider_start::<T>);
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klass.stop = Some(device_provider_stop::<T>);
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unsafe {
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if let Some(metadata) = T::metadata() {
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ffi::gst_device_provider_class_set_metadata(
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klass,
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metadata.long_name.to_glib_none().0,
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metadata.classification.to_glib_none().0,
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metadata.description.to_glib_none().0,
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metadata.author.to_glib_none().0,
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);
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for (key, value) in metadata.additional.iter() {
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ffi::gst_device_provider_class_add_metadata(
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klass,
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key.to_glib_none().0,
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value.to_glib_none().0,
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);
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}
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}
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}
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}
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}
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unsafe extern "C" fn device_provider_probe<T: DeviceProviderImpl>(
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ptr: *mut ffi::GstDeviceProvider,
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) -> *mut glib::ffi::GList {
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let instance = &*(ptr as *mut T::Instance);
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let imp = instance.imp();
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imp.probe().to_glib_full()
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}
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unsafe extern "C" fn device_provider_start<T: DeviceProviderImpl>(
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ptr: *mut ffi::GstDeviceProvider,
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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.start() {
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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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unsafe extern "C" fn device_provider_stop<T: DeviceProviderImpl>(ptr: *mut ffi::GstDeviceProvider) {
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let instance = &*(ptr as *mut T::Instance);
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let imp = instance.imp();
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imp.stop();
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}
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