Fix double stop in ANSVideoPlayer

modules/ANSLPR/ANSLPR_OD.cpp

@@ -12,6 +12,7 @@
 #include <thread>
 #include <chrono>
 #include <algorithm>
+#include <atomic>
 #include <unordered_map>
 // ---------------------------------------------------------------------------
 // Check ONNX model opset version by reading the protobuf header directly.
@@ -3121,6 +3122,41 @@ namespace ANSCENTER {
 		std::lock_guard<std::mutex> plateLock(_plateIdentitiesMutex);
 		auto& identities = _plateIdentities[cameraId];
 
+		// Leak diagnostic — [OCR_Leak] heartbeat fires at most once per 60 s
+		// process-wide. Reports the three per-camera state containers that
+		// _could_ accumulate: _plateIdentities (keyed by cameraId), its sum
+		// of inner-vector sizes, _colourCache, _imageSizeTrackers. All three
+		// have stated bounds; heartbeat confirms they actually hold.
+		//   cams     — number of distinct cameraId keys in _plateIdentities
+		//   ids_tot  — sum of per-camera identity-vector sizes (should plateau)
+		//   clr      — _colourCache size (bounded at COLOUR_CACHE_MAX_SIZE=200)
+		//   imgtrk   — _imageSizeTrackers size (one entry per cameraId)
+		// All size() reads outside locks are diagnostic snapshots; brief
+		// races are acceptable (we're looking at trends over minutes).
+		{
+			using clk = std::chrono::steady_clock;
+			static std::atomic<long long> s_nextLog{0};
+			const long long tick = clk::now().time_since_epoch().count();
+			long long expected = s_nextLog.load(std::memory_order_relaxed);
+			if (tick >= expected) {
+				const long long deadline = tick +
+					std::chrono::duration_cast<clk::duration>(
+						std::chrono::seconds(60)).count();
+				if (s_nextLog.compare_exchange_strong(expected, deadline,
+				                                       std::memory_order_relaxed)) {
+					size_t ids_tot = 0;
+					for (const auto& [cam, v] : _plateIdentities) ids_tot += v.size();
+					ANS_DBG("OCR_Leak",
+						"ANSALPR_OD this=%p cams=%zu ids_tot=%zu clr=%zu imgtrk=%zu",
+						(void*)this,
+						_plateIdentities.size(),
+						ids_tot,
+						_colourCache.size(),
+						_imageSizeTrackers.size());
+				}
+			}
+		}
+
 		// Option B: Auto-detect mode by counting detections.
 		// 1 detection  → crop/pipeline mode → return instant result, no accumulated scoring
 		// 2+ detections → full-frame mode   → use accumulated scoring for dedup