Expose PCM drain state and cursor while file playback waits at EOF

tools/chatgui/src/videoplayer_engine.cpp

@@ -524,6 +524,14 @@ void VideoPlayerEngine::presentTick() {
 
     const bool audioDone = !m_hasAudio || (!SoundManager::instance()->isPcmPlaying(m_audioPlayback) &&
         SoundManager::instance()->pcmCursor(m_audioPlayback) >= m_audioFrames);
+    if (m_decodeEof && m_elapsed.elapsed() - m_drainReportAt >= 1000) {
+        m_drainReportAt = m_elapsed.elapsed();
+        DEBUG_DEBUG(DEBUG_CATEGORY_VIDEO,
+            "VideoEngine: drain epoch=%d position=%lldms pending=%zu video_end=%lldms PCM=%llu/%llu playing=%d audio_clock=%d",
+            epoch, (long long)clk, m_pending.size(), (long long)m_videoEndMs,
+            (unsigned long long)SoundManager::instance()->pcmCursor(m_audioPlayback), (unsigned long long)m_audioFrames,
+            SoundManager::instance()->isPcmPlaying(m_audioPlayback), m_audioClock);
+    }
     if (m_decodeEof && m_pending.empty() && clk >= m_videoEndMs && audioDone) {
         m_presentTimer.stop();
         DEBUG_INFO(DEBUG_CATEGORY_VIDEO, "VideoEngine: playback finished epoch=%d position=%lldms video_end=%lldms audio_done=%d",

tools/chatgui/src/videoplayer_engine.h

@@ -92,6 +92,7 @@ private:
     QImage m_renderFrame;
     bool m_decodeEof = false; // EOF только текущей эпохи; не меняет состояние/возможность паузы.
     qint64 m_videoEndMs = 0; // Максимальный конец принятого кадра: PTS + его длительность.
+    qint64 m_drainReportAt = 0; // Последний DEBUG-снимок доигрывания по m_elapsed, мс; не чаще раза в секунду.
     QTimer m_presentTimer;
     uint64_t m_audioPlayback = 0;
     int m_audioSampleRate = 0;