李伟
514 lines
16 KiB
C#
514 lines
16 KiB
C#
using Basler.Pylon;
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using Serilog;
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using CameraGrabErrorEventArgs = XP.Camera.GrabErrorEventArgs;
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using CameraImageGrabbedEventArgs = XP.Camera.ImageGrabbedEventArgs;
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namespace XP.Camera;
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/// <summary>
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/// Basler 相机控制器，封装 Basler pylon .NET SDK 实现 <see cref="ICameraController"/>。
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/// </summary>
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/// <remarks>
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/// <para>所有公共方法通过内部 <c>_syncLock</c> 对象进行 lock 同步，保证线程安全。</para>
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/// <para>事件回调（ImageGrabbed、GrabError）在 StreamGrabber 回调线程上触发，不持有 _syncLock，避免死锁。</para>
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/// <para>ConnectionLost 事件在 pylon SDK 事件线程上触发。</para>
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/// </remarks>
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public class BaslerCameraController : ICameraController
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{
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private static readonly ILogger _logger = Log.ForContext<BaslerCameraController>();
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private readonly object _syncLock = new();
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private Basler.Pylon.Camera? _camera;
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private CameraInfo? _cachedCameraInfo;
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private bool _isConnected;
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private bool _isGrabbing;
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/// <summary>
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/// 初始化 <see cref="BaslerCameraController"/> 实例。
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/// </summary>
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public BaslerCameraController()
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{
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}
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/// <inheritdoc />
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public bool IsConnected
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{
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get { lock (_syncLock) { return _isConnected; } }
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}
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/// <inheritdoc />
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public bool IsGrabbing
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{
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get { lock (_syncLock) { return _isGrabbing; } }
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}
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/// <inheritdoc />
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public event EventHandler<CameraImageGrabbedEventArgs>? ImageGrabbed;
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/// <inheritdoc />
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public event EventHandler<CameraGrabErrorEventArgs>? GrabError;
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/// <inheritdoc />
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public event EventHandler? ConnectionLost;
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/// <inheritdoc />
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public CameraInfo Open()
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{
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lock (_syncLock)
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{
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if (_isConnected && _cachedCameraInfo != null)
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{
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_logger.Information("Camera already connected, returning cached info.");
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return _cachedCameraInfo;
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}
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try
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{
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_logger.Information("Opening camera connection...");
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_camera = new Basler.Pylon.Camera(CameraSelectionStrategy.FirstFound);
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_camera.CameraOpened += (sender, e) => Configuration.SoftwareTrigger(sender!, e);
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_camera.ConnectionLost += OnConnectionLost;
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_camera.Open();
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_cachedCameraInfo = new CameraInfo(
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ModelName: _camera.CameraInfo![CameraInfoKey.ModelName] ?? "",
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SerialNumber: _camera.CameraInfo[CameraInfoKey.SerialNumber] ?? "",
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VendorName: _camera.CameraInfo[CameraInfoKey.VendorName] ?? "",
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DeviceType: _camera.CameraInfo[CameraInfoKey.DeviceType] ?? ""
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);
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_isConnected = true;
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_logger.Information("Camera connected: {ModelName} (SN: {SerialNumber})",
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_cachedCameraInfo.ModelName, _cachedCameraInfo.SerialNumber);
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return _cachedCameraInfo;
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}
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catch (Exception ex) when (ex is not CameraException)
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{
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// Clean up partially created camera on failure
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_camera?.Dispose();
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_camera = null;
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if (ex.Message.Contains("No device", StringComparison.OrdinalIgnoreCase)
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|| ex.Message.Contains("not found", StringComparison.OrdinalIgnoreCase)
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|| ex is InvalidOperationException)
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{
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_logger.Error(ex, "No camera device found.");
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throw new DeviceNotFoundException("No Basler camera device found.", ex);
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}
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_logger.Error(ex, "Failed to open camera.");
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throw new CameraException("Failed to open camera device.", ex);
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}
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}
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}
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/// <inheritdoc />
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public void Close()
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{
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lock (_syncLock)
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{
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if (!_isConnected)
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{
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_logger.Information("Camera not connected, Close() ignored.");
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return;
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}
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try
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{
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if (_isGrabbing)
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{
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StopGrabbingInternal();
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}
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_logger.Information("Closing camera connection...");
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_camera?.Close();
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_camera?.Dispose();
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_camera = null;
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_isConnected = false;
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_cachedCameraInfo = null;
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_logger.Information("Camera connection closed.");
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}
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catch (Exception ex) when (ex is not CameraException)
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{
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_logger.Error(ex, "Error while closing camera.");
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// Still clean up state even if close fails
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_camera = null;
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_isConnected = false;
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_isGrabbing = false;
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_cachedCameraInfo = null;
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throw new CameraException("Failed to close camera device.", ex);
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}
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}
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}
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/// <inheritdoc />
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public void StartGrabbing()
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{
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lock (_syncLock)
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{
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EnsureConnected();
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if (_isGrabbing)
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{
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_logger.Information("Already grabbing, StartGrabbing() ignored.");
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return;
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}
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try
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{
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_logger.Information("Starting grabbing with software trigger...");
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// Register ImageReady event for grab results (task 6.2 will implement the handler)
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_camera!.StreamGrabber!.ImageGrabbed += OnImageGrabbed;
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// Start grabbing using the grab loop thread provided by StreamGrabber
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_camera.StreamGrabber!.Start(GrabStrategy.OneByOne, GrabLoop.ProvidedByStreamGrabber);
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_isGrabbing = true;
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_logger.Information("Grabbing started.");
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}
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catch (Exception ex) when (ex is not CameraException)
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{
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_logger.Error(ex, "Failed to start grabbing.");
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throw new CameraException("Failed to start grabbing.", ex);
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}
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}
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}
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/// <inheritdoc />
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public void ExecuteSoftwareTrigger()
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{
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lock (_syncLock)
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{
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if (!_isGrabbing)
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{
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throw new InvalidOperationException("Cannot execute software trigger: camera is not grabbing.");
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}
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try
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{
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// Wait until the camera is ready to accept the next frame trigger
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if (!_camera!.WaitForFrameTriggerReady(1000, TimeoutHandling.Return))
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{
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throw new TimeoutException("Camera was not ready for frame trigger within 1000 ms.");
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}
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_camera.ExecuteSoftwareTrigger();
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_logger.Debug("Software trigger executed.");
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}
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catch (TimeoutException)
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{
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throw; // Re-throw our own TimeoutException
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}
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catch (Exception ex) when (ex is not CameraException and not InvalidOperationException)
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{
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_logger.Error(ex, "Failed to execute software trigger.");
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throw new CameraException("Failed to execute software trigger.", ex);
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}
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}
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}
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/// <inheritdoc />
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public void StopGrabbing()
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{
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lock (_syncLock)
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{
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if (!_isGrabbing)
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{
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return;
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}
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StopGrabbingInternal();
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}
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}
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/// <inheritdoc />
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public double GetExposureTime()
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{
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lock (_syncLock)
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{
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EnsureConnected();
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try
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{
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return _camera!.Parameters[PLCamera.ExposureTime].GetValue();
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}
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catch (Exception ex) when (ex is not CameraException)
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{
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_logger.Error(ex, "Failed to get exposure time.");
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throw new CameraException("Failed to get exposure time.", ex);
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}
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}
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}
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/// <inheritdoc />
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public void SetExposureTime(double microseconds)
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{
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lock (_syncLock)
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{
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EnsureConnected();
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try
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{
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_camera!.Parameters[PLCamera.ExposureTime].SetValue(microseconds);
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_logger.Information("Exposure time set to {Microseconds} µs.", microseconds);
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}
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catch (Exception ex) when (ex is not CameraException)
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{
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_logger.Error(ex, "Failed to set exposure time to {Microseconds} µs.", microseconds);
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throw new CameraException("Failed to set exposure time.", ex);
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}
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}
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}
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/// <inheritdoc />
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public double GetGain()
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{
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lock (_syncLock)
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{
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EnsureConnected();
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try
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{
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return _camera!.Parameters[PLCamera.Gain].GetValue();
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}
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catch (Exception ex) when (ex is not CameraException)
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{
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_logger.Error(ex, "Failed to get gain.");
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throw new CameraException("Failed to get gain.", ex);
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}
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}
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}
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/// <inheritdoc />
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public void SetGain(double value)
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{
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lock (_syncLock)
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{
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EnsureConnected();
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try
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{
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_camera!.Parameters[PLCamera.Gain].SetValue(value);
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_logger.Information("Gain set to {Value}.", value);
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}
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catch (Exception ex) when (ex is not CameraException)
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{
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_logger.Error(ex, "Failed to set gain to {Value}.", value);
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throw new CameraException("Failed to set gain.", ex);
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}
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}
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}
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/// <inheritdoc />
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public int GetWidth()
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{
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lock (_syncLock)
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{
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EnsureConnected();
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try
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{
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return (int)_camera!.Parameters[PLCamera.Width].GetValue();
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}
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catch (Exception ex) when (ex is not CameraException)
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{
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_logger.Error(ex, "Failed to get width.");
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throw new CameraException("Failed to get width.", ex);
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}
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}
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}
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/// <inheritdoc />
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public void SetWidth(int value)
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{
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lock (_syncLock)
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{
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EnsureConnected();
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try
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{
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_camera!.Parameters[PLCamera.Width].SetValue(value, IntegerValueCorrection.Nearest);
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_logger.Information("Width set to {Value}.", value);
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}
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catch (Exception ex) when (ex is not CameraException)
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{
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_logger.Error(ex, "Failed to set width to {Value}.", value);
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throw new CameraException("Failed to set width.", ex);
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}
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}
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}
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/// <inheritdoc />
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public int GetHeight()
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{
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lock (_syncLock)
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{
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EnsureConnected();
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try
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{
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return (int)_camera!.Parameters[PLCamera.Height].GetValue();
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}
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catch (Exception ex) when (ex is not CameraException)
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{
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_logger.Error(ex, "Failed to get height.");
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throw new CameraException("Failed to get height.", ex);
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}
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}
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}
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/// <inheritdoc />
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public void SetHeight(int value)
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{
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lock (_syncLock)
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{
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EnsureConnected();
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try
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{
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_camera!.Parameters[PLCamera.Height].SetValue(value, IntegerValueCorrection.Nearest);
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_logger.Information("Height set to {Value}.", value);
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}
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catch (Exception ex) when (ex is not CameraException)
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{
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_logger.Error(ex, "Failed to set height to {Value}.", value);
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throw new CameraException("Failed to set height.", ex);
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}
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}
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}
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/// <inheritdoc />
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public string GetPixelFormat()
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{
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lock (_syncLock)
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{
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EnsureConnected();
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try
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{
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return _camera!.Parameters[PLCamera.PixelFormat].GetValue();
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}
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catch (Exception ex) when (ex is not CameraException)
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{
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_logger.Error(ex, "Failed to get pixel format.");
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throw new CameraException("Failed to get pixel format.", ex);
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}
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}
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}
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/// <inheritdoc />
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public void SetPixelFormat(string format)
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{
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lock (_syncLock)
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{
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EnsureConnected();
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try
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{
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_camera!.Parameters[PLCamera.PixelFormat].SetValue(format);
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_logger.Information("Pixel format set to {Format}.", format);
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}
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catch (Exception ex) when (ex is not CameraException)
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{
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_logger.Error(ex, "Failed to set pixel format to {Format}.", format);
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throw new CameraException("Failed to set pixel format.", ex);
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}
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}
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}
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/// <inheritdoc />
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public void Dispose()
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{
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Close();
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GC.SuppressFinalize(this);
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}
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/// <summary>
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/// StreamGrabber.ImageGrabbed 事件处理。在 StreamGrabber 回调线程上调用，不持有 _syncLock。
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/// </summary>
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/// <remarks>
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/// <para>当图像采集成功时，提取像素数据、宽高和像素格式，触发 <see cref="ImageGrabbed"/> 事件。</para>
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/// <para>当图像采集失败时，提取错误码和错误描述，触发 <see cref="GrabError"/> 事件。</para>
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/// <para>此方法在 StreamGrabber 回调线程上执行，不持有 _syncLock，以避免死锁。
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/// 调用方如需在 WPF UI 线程上处理事件，应自行通过 Dispatcher 调度。</para>
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/// </remarks>
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private void OnImageGrabbed(object? sender, Basler.Pylon.ImageGrabbedEventArgs e)
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{
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try
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{
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IGrabResult grabResult = e.GrabResult;
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if (grabResult.GrabSucceeded)
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{
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byte[] pixelData = grabResult.PixelData as byte[] ?? Array.Empty<byte>();
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int width = grabResult.Width;
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int height = grabResult.Height;
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string pixelFormat = grabResult.PixelTypeValue.ToString();
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var args = new CameraImageGrabbedEventArgs(pixelData, width, height, pixelFormat);
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ImageGrabbed?.Invoke(this, args);
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}
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else
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{
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int errorCode = (int)grabResult.ErrorCode;
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string errorDescription = grabResult.ErrorDescription ?? "Unknown grab error.";
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_logger.Error("Image grab failed. ErrorCode: {ErrorCode}, Description: {ErrorDescription}",
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errorCode, errorDescription);
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var args = new CameraGrabErrorEventArgs(errorCode, errorDescription);
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GrabError?.Invoke(this, args);
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}
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}
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catch (Exception ex)
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{
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_logger.Error(ex, "Exception in OnImageGrabbed handler.");
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}
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}
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/// <summary>
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/// ConnectionLost 事件处理。在 pylon SDK 事件线程上调用。
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/// </summary>
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private void OnConnectionLost(object? sender, EventArgs e)
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{
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_logger.Warning("Camera connection lost.");
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lock (_syncLock)
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{
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_isGrabbing = false;
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_isConnected = false;
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_cachedCameraInfo = null;
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}
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// Raise event outside lock to avoid deadlock
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ConnectionLost?.Invoke(this, EventArgs.Empty);
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}
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/// <summary>
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/// Internal stop grabbing without lock (caller must hold _syncLock).
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/// </summary>
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private void StopGrabbingInternal()
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{
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if (!_isGrabbing)
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return;
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try
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{
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_camera?.StreamGrabber?.Stop();
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if (_camera != null)
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_camera.StreamGrabber!.ImageGrabbed -= OnImageGrabbed;
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_isGrabbing = false;
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_logger.Information("Grabbing stopped.");
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}
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catch (Exception ex) when (ex is not CameraException)
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{
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_isGrabbing = false;
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_logger.Error(ex, "Error while stopping grabbing.");
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throw new CameraException("Failed to stop grabbing.", ex);
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}
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}
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/// <summary>
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/// Throws <see cref="InvalidOperationException"/> if the camera is not connected.
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/// Must be called within a lock on <see cref="_syncLock"/>.
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/// </summary>
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private void EnsureConnected()
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{
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if (!_isConnected)
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{
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throw new InvalidOperationException("Camera is not connected. Call Open() first.");
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}
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}
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} |