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");

tools/chatgui/tests/test_audio_recovery.cpp

@@ -381,7 +381,11 @@ static void adaptive_buffers(SoundManager* manager) {
     REQUIRE(call->captureError().isEmpty() && radio->captureError().isEmpty() && radio->captureAvailable());
     pump(4500); slowCaptureClose = true;
     inject_capture_glitch(); pump(250); inject_capture_glitch(); pump(250);
-    QElapsedTimer elapsed; elapsed.start(); call->stop(); radio->stop();
+    QElapsedTimer elapsed; elapsed.start();
+    AudioCapture incoming;
+    REQUIRE(!incoming.open({}, AudioCapture::Role::Stream, 2, 75, [](int, int) { return true; }, [] {}, [](const auto&) {}));
+    REQUIRE(!incoming.subscribed() && elapsed.elapsed() < 300);
+    elapsed.restart(); call->stop(); radio->stop();
     REQUIRE(elapsed.elapsed() < 300); // Stop не ждёт выполняющееся закрытие для изменения буфера.
     pump(900); slowCaptureClose = false;
     REQUIRE(call->start(72) == 0 && radio->start(73) == 0); pump(100);