Drain GPU outputs independently of capture and verify lossless recovery

tools/chatgui/tests/test_call_video_clock.cpp

@@ -51,14 +51,16 @@ int main(int argc, char** argv) {
         if (!encoder.encode(image, 1000000 + i * 33333ll, i == 0, output, completion) || output.size() != 1) return 3;
         frames.push_back(output.front());
     }
-    CallVideoEngine engine; std::vector<int64_t> published;
-    QObject::connect(&engine, &CallVideoEngine::imageChanged, [&](const QImage& frame) {
+    CallVideoEngine engine; engine.setPresentationDriven(true); std::vector<int64_t> published;
+    QObject::connect(&engine, &CallVideoEngine::imageChanged, [&](const QImage& frame, quint64 serial) {
         if (!frame.isNull()) published.push_back(nowUs());
+        // Подтверждение потребления отдельно от доставки signal, как paintEvent окна.
+        QTimer::singleShot(5, &engine, [&engine, serial] { engine.imagePresented(serial); });
     });
     for (int scenario = 0; scenario < 2; ++scenario) {
         disturbed = scenario != 0; cursor = 0; published.clear();
         start = nowUs(); engine.start(7); QElapsedTimer timer; timer.start(); bool uiPaused = false;
-        while (timer.elapsed() < 3200) {
+        while (timer.elapsed() < 4000) {
             if (disturbed && !uiPaused && timer.elapsed() >= 1500) { QThread::msleep(60); uiPaused = true; }
             app.processEvents(); QThread::msleep(2);
         }
@@ -71,7 +73,7 @@ int main(int argc, char** argv) {
             "gap_p50_us=%lld gap_p95_us=%lld gap_max_us=%lld audio_epochs=32", disturbed, published.size(), requests.load(), rejects.load(),
             (long long)(gaps.empty() ? 0 : gaps[gaps.size() / 2]), (long long)(gaps.empty() ? 0 : gaps[gaps.size() * 95 / 100]),
             (long long)(gaps.empty() ? 0 : gaps.back()));
-        if (published.size() < (disturbed ? 82u : 85u) || requests || rejects) return 1;
+        if (published.size() != frames.size() || requests || rejects) return 1;
     }
     return 0;
 }