A wee bit more if Jack

engine/src/audio_engine/coreaudio_ab.rs

@@ -9,6 +9,10 @@ impl AudioBackend for CoreAudioBackend {
     fn start_client(&mut self) -> Result<(), Box<dyn std::error::Error>> {
         Ok(())
     }
+
+    fn describe_backend() -> Result<super::BackendDescription, Box<dyn std::error::Error>> {
+        todo!()
+    }
 }
 
 #[cfg(not(feature = "coreaudio"))]
@@ -16,4 +20,7 @@ impl AudioBackend for CoreAudioBackend {
     fn start_client(&mut self) -> Result<(), Box<dyn std::error::Error>> {
         todo!()
     }
+    fn describe_backend() -> Result<super::BackendDescription, Box<dyn std::error::Error>> {
+        todo!()
+    }
 }

engine/src/audio_engine/dummy_ab.rs

@@ -12,4 +12,8 @@ impl AudioBackend for DummyAudioBackend {
     fn start_client(&mut self) -> Result<(), Box<dyn std::error::Error>> {
         todo!()
     }
+
+    fn describe_backend() -> Result<super::BackendDescription, Box<dyn std::error::Error>> {
+        todo!()
+    }
 }

engine/src/audio_engine/jack_ab.rs

@@ -5,6 +5,8 @@ use std::error::Error;
 
 #[cfg(feature = "jack")]
 use jack;
+#[cfg(feature = "jack")]
+use jack::ClientOptions;
 
 pub(crate) struct JackAudioBackend {
     pub(crate) feature_jack: bool,
@@ -38,40 +40,25 @@ impl AudioBackend for JackAudioBackend {
     fn start_client(&mut self) -> Result<(), Box<dyn Error>> {
         Ok(())
     }
-}
 
-#[cfg(feature = "jack")]
-#[cfg(test)]
-mod tests {
-    use jack::ClientOptions;
+    // Get the possible input and output ports to use them for the session initialization
+    fn describe_backend() -> Result<super::BackendDescription, Box<dyn Error>> {
+        use jack::{Client, PortFlags};
+        use crate::audio_engine::BackendDescription;
 
-    use super::*;
+        let (client, _) = Client::new("list_ports", ClientOptions::empty())?;
+        let ports_in = client.ports(None, None, PortFlags::IS_INPUT);
+        let ports_out = client.ports(None, None, PortFlags::IS_OUTPUT);
+        let output = BackendDescription {
+            audio_devices_out: ports_out,
+            audio_devices_in: ports_in,
+        };
        
-    #[test]
-    fn start_jack_client() {
-        let (client, _status) =
-            jack::Client::new("list_clients_example", ClientOptions::NO_START_SERVER)
-                .expect("Failed to create JACK client");
-
-        // Get all ports, then extract the unique client names
-        let ports = client.ports(None, None, jack::PortFlags::empty());
-
-        let mut clients: Vec<String> = ports
-            .iter()
-            .filter_map(|port| port.split(':').next().map(|s| s.to_string()))
-            .collect();
-
-        clients.sort();
-        clients.dedup();
-
-        println!("JACK clients:");
-        for c in clients {
-            assert_eq!(c, "test");
-            println!(" - {}", c);
-        }
+        Ok(output)
     }
 }
 
+
 #[cfg(not(feature = "jack"))]
 #[derive(Default)]
 pub(crate) struct JackStatus {}
@@ -82,4 +69,7 @@ impl AudioBackend for JackAudioBackend {
         warn!("jack support is not enabled");
         Ok(())
     }
+    fn describe_backend() -> Result<super::BackendDescription, Box<dyn Error>> {
+        unimplemented!("jack is disabled")
+    }
 }

engine/src/audio_engine/mod.rs

@@ -4,9 +4,14 @@ pub(crate) mod coreaudio_ab;
 pub(crate) mod dummy_ab;
 pub(crate) mod jack_ab;
 
+pub(crate) struct BackendDescription {
+    pub(crate) audio_devices_out: Vec<String>,
+    pub(crate) audio_devices_in: Vec<String>,
+}
 pub(crate) trait AudioBackend {
     // Start a audio backend client
     // It should be executed either on the startup,
     // or when the audio backend is switched
     fn start_client(&mut self) -> Result<(), Box<dyn Error>>;
+    fn describe_backend() -> Result<BackendDescription, Box<dyn Error>>;
 }

engine/src/control_pane/grpc/mod.rs

@@ -9,7 +9,7 @@ use lib::termix::{
     },
 };
 use log::info;
-use tonic::{Response, transport::Server};
+use tonic::{Response, Status, transport::Server};
 use tonic_reflection::server;
 
 use crate::{
@@ -83,7 +83,21 @@ impl AudioBackendRpc for TermixAudioBackend {
         request: tonic::Request<DesiredAudioBacked>,
     ) -> Result<tonic::Response<AudioBackendDescription>, tonic::Status> {
         info!("Describing the audio backend");
-        todo!();
+        match request.get_ref().backend() {
+            SupportedAudioBackends::AbUnspecified => return Err(Status::not_found("backend os not specified")),
+            SupportedAudioBackends::AbCoreaudio => todo!(),
+            SupportedAudioBackends::AbJack => {
+                let backend_desc= match jack_ab::JackAudioBackend::describe_backend(){
+                    Ok(desc) => desc,
+                    Err(err) => return Err(Status::internal(err.to_string())),
+                };
+                Ok(Response::new(AudioBackendDescription{ 
+                    core_audio_description: None, 
+                    input_devices: backend_desc.audio_devices_in, 
+                    output_devices: backend_desc.audio_devices_out 
+                }))
+            }
+        }
     }
     async fn init_connection(
         &self,