Ограничить камеру звонка до 30 fps перед конвертацией

tools/chatgui/tests/test_call_camera_capture.cpp

@@ -75,6 +75,7 @@ public:
     bool start(const QByteArray& id, int w, int h) override {
         device = id; width = w; height = h; record("start:" + id);
         if (id == "start-stall") QThread::sleep(60);
+        timer.setInterval(id == "fast" ? 5 : 33);
         timer.start(); return true;
     }
     void stop() override {
@@ -111,6 +112,19 @@ private slots:
         path = directory.filePath(QString::number(QDateTime::currentMSecsSinceEpoch()));
         qputenv("UTUN_CAMERA_TEST_LOG", path.toUtf8());
     }
+    void fastCameraKeepsThirtyFps() {
+        auto capture = std::make_unique<CallCameraCapture>();
+        unsigned frames = 0;
+        connect(capture.get(), &CallCameraCapture::frameReady, this, [&](const QImage&, qint64, qint64) { ++frames; });
+        QSignalSpy errors(capture.get(), &CallCameraCapture::failed);
+        capture->configure(true, "fast", 640, 480);
+        QTRY_VERIFY_WITH_TIMEOUT(frames >= 5, 3000);
+        const unsigned before = frames; QElapsedTimer timer; timer.start(); QTest::qWait(2000);
+        const double fps = (frames - before) * 1000.0 / timer.elapsed();
+        qInfo("fast camera converted output fps=%.2f frames=%u", fps, frames - before);
+        QVERIFY(fps >= 25.0); QVERIFY(fps <= 31.0); QCOMPARE(errors.size(), 0);
+        const qint64 child = pid(); capture.reset(); QTRY_VERIFY_WITH_TIMEOUT(!alive(child), 3000);
+    }
     void latestFrameAndGeneration() {
         auto capture = std::make_unique<CallCameraCapture>();
         unsigned frames = 0; qint64 maxAge = 0; QColor color; bool expectBlue = false, wrongGeneration = false;