[fix](trx-frontend-http): reconfigure audio stream on rig change

Co-authored-by: OpenAI Codex <codex@openai.com>
Signed-off-by: Stan Grams <sjg@haxx.space>

src/trx-client/trx-frontend/trx-frontend-http/assets/web/app.js

@@ -2642,6 +2642,40 @@ function clearTxTimeout() {
   txTimeoutRemaining = 0;
 }
 
+function resetRxDecoder() {
+  if (opusDecoder) {
+    try { opusDecoder.close(); } catch (e) {}
+    opusDecoder = null;
+  }
+  nextPlayTime = 0;
+}
+
+function configureRxStream(nextInfo) {
+  const nextSampleRate = (nextInfo && nextInfo.sample_rate) || 48000;
+  const sampleRateChanged = !audioCtx || audioCtx.sampleRate !== nextSampleRate;
+  streamInfo = nextInfo;
+  updateWfmControls();
+  resetRxDecoder();
+  if (sampleRateChanged && audioCtx) {
+    audioCtx.close().catch(() => {});
+    audioCtx = null;
+    rxGainNode = null;
+  }
+  if (!audioCtx) {
+    audioCtx = new AudioContext({ sampleRate: nextSampleRate });
+    audioCtx.resume().catch(() => {});
+  }
+  if (!rxGainNode) {
+    rxGainNode = audioCtx.createGain();
+    rxGainNode.connect(audioCtx.destination);
+  }
+  rxGainNode.gain.value = rxVolSlider.value / 100;
+  rxActive = true;
+  rxAudioBtn.style.borderColor = "#00d17f";
+  rxAudioBtn.style.color = "#00d17f";
+  audioStatus.textContent = "RX";
+}
+
 function startRxAudio() {
   if (rxActive) { stopRxAudio(); return; }
   if (!hasWebCodecs) {
@@ -2661,17 +2695,7 @@ function startRxAudio() {
     if (typeof evt.data === "string") {
       // Stream info JSON
       try {
-        streamInfo = JSON.parse(evt.data);
-        updateWfmControls();
-        audioCtx = new AudioContext({ sampleRate: streamInfo.sample_rate || 48000 });
-        audioCtx.resume().catch(() => {});
-        rxGainNode = audioCtx.createGain();
-        rxGainNode.gain.value = rxVolSlider.value / 100;
-        rxGainNode.connect(audioCtx.destination);
-        rxActive = true;
-        rxAudioBtn.style.borderColor = "#00d17f";
-        rxAudioBtn.style.color = "#00d17f";
-        audioStatus.textContent = "RX";
+        configureRxStream(JSON.parse(evt.data));
       } catch (e) {
         console.error("Audio stream info parse error", e);
       }

src/trx-client/trx-frontend/trx-frontend-http/src/audio.rs

@@ -226,7 +226,7 @@ pub async fn audio_ws(
     let (response, mut session, mut msg_stream) = actix_ws::handle(&req, body)?;
 
     actix_web::rt::spawn(async move {
-        let info = loop {
+        let mut current_info = loop {
             if let Some(info) = info_rx.borrow().clone() {
                 break info;
             }
@@ -236,7 +236,7 @@ pub async fn audio_ws(
             }
         };
 
-        let info_json = match serde_json::to_string(&info) {
+        let info_json = match serde_json::to_string(&current_info) {
             Ok(j) => j,
             Err(_) => {
                 let _ = session.close(None).await;
@@ -247,12 +247,35 @@ pub async fn audio_ws(
             return;
         }
 
-        let mut rx_session = session.clone();
-        let rx_handle = actix_web::rt::spawn(async move {
         loop {
-                match rx_sub.recv().await {
+            tokio::select! {
+                changed = info_rx.changed() => {
+                    match changed {
+                        Ok(()) => {
+                            let Some(next_info) = info_rx.borrow().clone() else {
+                                continue;
+                            };
+                            let changed = next_info.sample_rate != current_info.sample_rate
+                                || next_info.channels != current_info.channels
+                                || next_info.frame_duration_ms != current_info.frame_duration_ms;
+                            if changed {
+                                current_info = next_info;
+                                let info_json = match serde_json::to_string(&current_info) {
+                                    Ok(j) => j,
+                                    Err(_) => break,
+                                };
+                                if session.text(info_json).await.is_err() {
+                                    break;
+                                }
+                            }
+                        }
+                        Err(_) => break,
+                    }
+                }
+                packet = rx_sub.recv() => {
+                    match packet {
                         Ok(packet) => {
-                        if rx_session.binary(packet).await.is_err() {
+                            if session.binary(packet).await.is_err() {
                                 break;
                             }
                         }
@@ -262,19 +285,18 @@ pub async fn audio_ws(
                         Err(broadcast::error::RecvError::Closed) => break,
                     }
                 }
-        });
-
-        while let Some(Ok(msg)) = msg_stream.recv().await {
+                msg = msg_stream.recv() => {
                     match msg {
-                Message::Binary(data) => {
+                        Some(Ok(Message::Binary(data))) => {
                             let _ = tx_sender.send(Bytes::from(data.to_vec())).await;
                         }
-                Message::Close(_) => break,
-                _ => {}
+                        Some(Ok(Message::Close(_))) => break,
+                        Some(Ok(_)) => {}
+                        Some(Err(_)) | None => break,
+                    }
+                }
             }
         }
-
-        rx_handle.abort();
         let _ = session.close(None).await;
     });