Expose call camera preview and clear inactive remote video

tools/chatgui/src/call_video_engine.cpp

@@ -33,6 +33,8 @@ struct CallVideoEngine::Impl {
     int64_t pts = -1, backend = -1, anchor = -1;
     QImage shown;
     uint64_t shownSerial = 0, deliveredSerial = 0;
+    int64_t previewPts = -1, previewAt = 0;
+    bool previewVisible = false;
     QString status;
     bool statusDirty = false;
     void report(const QString& text) {
@@ -55,6 +57,23 @@ CallVideoEngine::CallVideoEngine(QObject* parent) : QObject(parent), m(std::make
           if (m->statusDirty) { status = m->status; m->statusDirty = false; report = true; } }
         if (changed) emit imageChanged(image);
         if (report) emit statusChanged(status);
+#ifdef HAVE_STREAM_CAPTURE
+        QVideoFrame preview; bool clear = false;
+        int64_t now = nowUs();
+        { std::lock_guard<std::mutex> guard(m->lock);
+          if (!m->enabled && m->previewVisible) { m->previewVisible = false; clear = true; }
+          if (m->enabled && m->raw.isValid() && m->pts != m->previewPts && now - m->previewAt >= 100000) {
+              preview = m->raw; m->previewPts = m->pts; m->previewAt = now;
+          } }
+        if (clear) emit localImageChanged({});
+        if (preview.isValid()) {
+            QImage local = preview.toImage();
+            if (!local.isNull()) {
+                m->previewVisible = true;
+                emit localImageChanged(local.scaled(320, 240, Qt::KeepAspectRatio, Qt::SmoothTransformation));
+            } else DEBUG_WARN(DEBUG_CATEGORY_CALL, "call camera preview conversion failed");
+        }
+#endif
     });
 }
 CallVideoEngine::~CallVideoEngine() { stop(); }
@@ -76,8 +95,9 @@ void CallVideoEngine::closeCamera() {
     if (m->sink) disconnect(m->sink.get(), nullptr, this, nullptr);
     if (m->camera) { disconnect(m->camera.get(), nullptr, this, nullptr); m->camera->stop(); }
     m->capture.reset(); m->camera.reset(); m->sink.reset();
-    std::lock_guard<std::mutex> guard(m->lock); m->raw = {}; m->pts = m->backend = m->anchor = -1;
+    { std::lock_guard<std::mutex> guard(m->lock); m->raw = {}; m->pts = m->backend = m->anchor = -1; }
 #endif
+    m->previewPts = -1; m->previewVisible = false; emit localImageChanged({});
 }
 void CallVideoEngine::stop() {
     m->running = false; m_timer.stop(); closeCamera();
@@ -231,7 +251,7 @@ void CallVideoEngine::receive() {
     struct Picture { int64_t pts; QImage image; };
     std::deque<Picture> pictures;
     CallVideoDecoder decoder;
-    uint64_t sourceEpoch = 0; int64_t lastShown = -1, report = 0; unsigned shown = 0;
+    uint64_t sourceEpoch = 0; int64_t lastShown = -1, report = 0, lastPictureAt = 0; unsigned shown = 0;
     uint64_t reportedGeneration = 0, rejectedGeneration = 0;
     while (m->running) {
         int64_t now = nowUs(); call_clock_snapshot clock{};
@@ -249,7 +269,14 @@ void CallVideoEngine::receive() {
                 }
                 pictures.pop_front();
             }
-            if (!selected.isNull()) { std::lock_guard<std::mutex> guard(m->lock); m->shown = selected; ++m->shownSerial; ++shown; }
+            if (!selected.isNull()) {
+                std::lock_guard<std::mutex> guard(m->lock); m->shown = selected; ++m->shownSerial; ++shown; lastPictureAt = now;
+            }
+        }
+        // VIDEO_OFF пока отсутствует в протоколе: убираем застывшую картинку после прекращения показа.
+        if (lastPictureAt && now - lastPictureAt >= 5000000) {
+            std::lock_guard<std::mutex> guard(m->lock); m->shown = {}; ++m->shownSerial; lastPictureAt = 0;
+            DEBUG_INFO(DEBUG_CATEGORY_CALL, "video playback hidden: no playable frame for 5s");
         }
         if (pictures.size() < 16) {
             call_video_frame packet{};

tools/chatgui/src/call_video_engine.h

@@ -16,6 +16,7 @@ public:
     static QList<QPair<QString, QByteArray>> cameras();
 signals:
     void imageChanged(const QImage& image);
+    void localImageChanged(const QImage& image);
     void statusChanged(const QString& status);
 private:
     struct Impl;