Improve jpeg conversion

modules/ANSCV/ANSOpenCV.cpp

@@ -246,7 +246,25 @@ namespace ANSCENTER
 		return jpegStr;
 	}
 
-	// ── NvJpegPool: fixed pool of 4 GPU encoders, lock-free acquire ──
+	// ── NvJpegPool: VRAM-scaled pool of GPU encoders, lock-free acquire ──
+
+	int NvJpegPool::detectPoolSize() {
+		// Query VRAM via CUDA and scale: 1 encoder per 2 GB, min 1
+		int deviceCount = 0;
+		if (cudaGetDeviceCount(&deviceCount) != cudaSuccess || deviceCount <= 0)
+			return 0;
+
+		cudaDeviceProp prop{};
+		if (cudaGetDeviceProperties(&prop, 0) != cudaSuccess)
+			return 0;
+
+		size_t vramGB = prop.totalGlobalMem / (1024ULL * 1024ULL * 1024ULL);
+		int pool = static_cast<int>(vramGB / 2);
+		if (pool < 1) pool = 1;
+
+		ANS_DBG("ANSCV", "NvJpegPool: GPU=%s, VRAM=%zuGB, poolSize=%d", prop.name, vramGB, pool);
+		return pool;
+	}
 
 	NvJpegPool& NvJpegPool::Instance() {
 		static NvJpegPool instance;
@@ -256,7 +274,13 @@ namespace ANSCENTER
 	NvJpegPool::NvJpegPool() {
 		if (!anscv_vendor_gate::IsNvidiaGpuAvailable()) return;
 
-		for (int i = 0; i < kPoolSize; ++i) {
+		_poolSize = detectPoolSize();
+		if (_poolSize <= 0) return;
+
+		_encoders.resize(_poolSize);
+		_inUse = std::make_unique<std::atomic<bool>[]>(_poolSize);
+
+		for (int i = 0; i < _poolSize; ++i) {
 			_inUse[i].store(false, std::memory_order_relaxed);
 			_encoders[i] = std::make_unique<NvJpegCompressor>();
 			if (!_encoders[i]->isValid()) {
@@ -264,16 +288,18 @@ namespace ANSCENTER
 			}
 		}
 		// Pool is available if at least one encoder initialized
-		for (int i = 0; i < kPoolSize; ++i) {
+		for (int i = 0; i < _poolSize; ++i) {
 			if (_encoders[i]) { _available = true; break; }
 		}
+
+		ANS_DBG("ANSCV", "NvJpegPool: initialized %d encoder(s), available=%d", _poolSize, _available ? 1 : 0);
 	}
 
 	std::string NvJpegPool::tryCompress(const cv::Mat& image, int quality) {
 		if (!_available) return "";
 
 		// Lock-free slot acquisition: try each slot with compare_exchange
-		for (int i = 0; i < kPoolSize; ++i) {
+		for (int i = 0; i < _poolSize; ++i) {
 			if (!_encoders[i]) continue;
 			bool expected = false;
 			if (_inUse[i].compare_exchange_strong(expected, true, std::memory_order_acquire)) {

modules/ANSCV/ANSOpenCV.h

@@ -69,22 +69,25 @@ namespace ANSCENTER
 
 	// Fixed-size pool of NvJpegCompressors (~40MB VRAM each).
 	// Threads that can't acquire an encoder fall back to TurboJPEG.
+	// Fixed pool of NvJpegCompressors sized by GPU VRAM.
+	// Formula: poolSize = VRAM_GB / 2 (min 1, e.g. 2GB→1, 4GB→2, 8GB→4, 10GB→5).
+	// Threads that can't acquire an encoder fall back to TurboJPEG.
 	class NvJpegPool {
 	public:
-		static constexpr int kPoolSize = 4;
 		static NvJpegPool& Instance();
-		// Try to compress with nvJPEG. Returns empty string if no encoder
-		// available or on non-NVIDIA hardware — caller should fall back.
 		[[nodiscard]] std::string tryCompress(const cv::Mat& image, int quality);
 		[[nodiscard]] bool isAvailable() const noexcept { return _available; }
+		[[nodiscard]] int poolSize() const noexcept { return _poolSize; }
 	private:
 		NvJpegPool();
 		~NvJpegPool() = default;
 		NvJpegPool(const NvJpegPool&) = delete;
 		NvJpegPool& operator=(const NvJpegPool&) = delete;
+		static int detectPoolSize();
 		bool                                            _available = false;
-		std::array<std::unique_ptr<NvJpegCompressor>, kPoolSize> _encoders;
-		std::array<std::atomic<bool>, kPoolSize>    _inUse;     // lock-free slot flags
+		int                                             _poolSize = 0;
+		std::vector<std::unique_ptr<NvJpegCompressor>>  _encoders;
+		std::unique_ptr<std::atomic<bool>[]>            _inUse;   // can't use vector — atomic is non-copyable
 	};
     /// <summary>
 	/// // ANSOPENCV class provides various image processing functionalities using OpenCV and ANS Center SDK.