Defer new shared subscribers during microphone buffer resizing

tools/chatgui/src/audio_capture.cpp

@@ -123,6 +123,10 @@ bool AudioCapture::open(const QString& input, Role role, int channels, uint64_t
     }
     if (!m_session) { m_session = std::make_shared<Session>(key); sessions.push_back(m_session); }
     auto& session = *m_session;
+    if (session.device.closing()) {
+        DEBUG_WARN(DEBUG_CATEGORY_CALL, "capture: shared input is resizing its buffer; new subscription deferred");
+        m_session.reset(); return false;
+    }
     auto& slot = session.consumers[role == Role::Stream ? 0 : 1];
     if (slot.client) {
         DEBUG_ERROR(DEBUG_CATEGORY_CALL, "capture: duplicate consumer role=%s", role == Role::Stream ? "stream" : "radio");