fix(android): recover from input stream failures

crates/chanora_audio/src/android_voice_unit.rs

@@ -421,7 +421,7 @@ impl AndroidVoiceUnit {
         let input_builder = input_builder.set_callback(input_cb);
 
         let mut input_stream = match input_builder.open_stream() {
-            Ok(s) => s,
+            Ok(s) => Some(s),
             Err(e) => {
                 // Input-preset fallback ladder (SDD-112 item 6) X
                 // Sharing-mode ladder (SDD-112 item 7), explored
@@ -432,14 +432,36 @@ impl AndroidVoiceUnit {
                     error = ?e,
                     "android: primary input stream open failed; entering fallback ladder"
                 );
-                Self::open_input_fallback(cfg, &event_tx, capture_state.clone())?
+                match Self::open_input_fallback(cfg, &event_tx, capture_state.clone()) {
+                    Ok(s) => Some(s),
+                    Err(fallback_err) => {
+                        warn!(
+                            target: "chanora_audio",
+                            error = %fallback_err,
+                            "android: input unavailable after all fallbacks; continuing listen-only with output stream"
+                        );
+                        None
+                    }
+                }
             }
         };
 
-        let input_perf = perf_from_oboe(input_stream.get_performance_mode());
-        let input_share = share_from_oboe(input_stream.get_sharing_mode());
-        let input_sample_rate = input_stream.get_sample_rate();
-        let input_frames_per_burst = input_stream.get_frames_per_burst();
+        let input_perf = input_stream
+            .as_ref()
+            .map(|s| perf_from_oboe(s.get_performance_mode()))
+            .unwrap_or(AchievedPerformanceMode::None);
+        let input_share = input_stream
+            .as_ref()
+            .map(|s| share_from_oboe(s.get_sharing_mode()))
+            .unwrap_or(AchievedSharingMode::Shared);
+        let input_sample_rate = input_stream
+            .as_ref()
+            .map(|s| s.get_sample_rate())
+            .unwrap_or(0);
+        let input_frames_per_burst = input_stream
+            .as_mut()
+            .map(|s| s.get_frames_per_burst())
+            .unwrap_or(0);
         let session_id = None;
         warn!(
             target: "chanora_audio",
@@ -570,7 +592,7 @@ impl AndroidVoiceUnit {
         publish_android_audio_diagnostics(diagnostics);
 
         Ok(Self {
-            input: Some(input_stream),
+            input: input_stream,
             output: Some(output_stream),
             input_perf,
             input_share,
@@ -697,8 +719,14 @@ impl AndroidVoiceUnit {
 impl MobileVoiceAudioBackend for AndroidVoiceUnit {
     fn start(&mut self) -> Result<(), BackendError> {
         if let Some(s) = self.input.as_mut() {
-            s.start()
-                .map_err(|e| BackendError::LifecycleFailed(format!("input start: {e:?}")))?;
+            if let Err(e) = s.start() {
+                warn!(
+                    target: "chanora_audio",
+                    error = ?e,
+                    "android: input start failed; continuing listen-only with output stream"
+                );
+                self.input = None;
+            }
         }
         if let Some(s) = self.output.as_mut() {
             s.start()

crates/chanora_bridge/src/api.rs

@@ -459,10 +459,18 @@ pub async fn connect(
         identity: None,
         ready_timeout: Duration::from_secs(15),
     };
-    let snap = runtime()
+    let snap = match runtime()
         .spawn(async move { session().connect(cfg).await })
         .await
-        .map_err(|e| task_join_error("connect", e))??;
+        .map_err(|e| task_join_error("connect", e))?
+    {
+        Ok(snap) => snap,
+        Err(chanora_core::CoreError::AlreadyConnected) => runtime()
+            .spawn(async { session().snapshot().await })
+            .await
+            .map_err(|e| task_join_error("connect.snapshot", e))??,
+        Err(e) => return Err(e.into()),
+    };
     Ok(snap.into())
 }