/// <summary>
/// Remove a callback handler for a given port.
/// </summary>
/// <param name="port">The port we are removing the callback handler on.</param>
public static void RemoveCallback(ControlPortBase port)
{
if (WorkingHandlers.ContainsKey(port))
{
WorkingHandlers.Remove(port);
}
}
/// <summary>
/// This is the camera's control port callback function. The callback is used if
/// MMALCameraConfig.SetChangeEventRequest is set to true.
/// </summary>
/// <seealso cref="MMALCameraConfig.SetChangeEventRequest" />
/// <param name="buffer">The buffer header being sent from MMAL.</param>
/// <param name="port">The managed control port instance.</param>
internal unsafe void CameraControlCallback(MMALBufferImpl buffer, ControlPortBase port)
{
if (buffer.Cmd == MMALEvents.MMAL_EVENT_PARAMETER_CHANGED)
{
var data = (MMAL_EVENT_PARAMETER_CHANGED_T *)buffer.Data;
if (data->Hdr.Id == MMALParametersCamera.MMAL_PARAMETER_CAMERA_SETTINGS)
{
var settings = (MMAL_PARAMETER_CAMERA_SETTINGS_T *)data;
MMALLog.Logger.Debug($"Analog gain num {settings->AnalogGain.Num}");
MMALLog.Logger.Debug($"Analog gain den {settings->AnalogGain.Den}");
MMALLog.Logger.Debug($"Exposure {settings->Exposure}");
MMALLog.Logger.Debug($"Focus position {settings->FocusPosition}");
}
}
else if (buffer.Cmd == MMALEvents.MMAL_EVENT_ERROR)
{
MMALLog.Logger.Info("No data received from sensor. Check all connections, including the Sunny one on the camera board");
}
else
{
MMALLog.Logger.Info("Received unexpected camera control callback event");
}
}
/// <summary>
/// Finds and returns a <see cref="IControlCallbackHandler"/> for a given port. If no handler is registered, a
/// <see cref="DefaultControlCallbackHandler"/> will be returned.
/// </summary>
/// <param name="port">The port we are retrieving the callback handler on.</param>
/// <returns>A <see cref="IControlCallbackHandler"/> for a given port. If no handler is registered, a
/// <see cref="DefaultControlCallbackHandler"/> will be returned.</returns>
public static IControlCallbackHandler FindCallback(ControlPortBase port)
{
if (WorkingHandlers.ContainsKey(port))
{
return(WorkingHandlers[port]);
}
return(new DefaultControlCallbackHandler(port));
}
/// <summary>
/// Creates a new instance of <see cref="DefaultControlCallbackHandler"/>.
/// </summary>
/// <param name="port">The working <see cref="ControlPortBase"/>.</param>
public DefaultControlCallbackHandler(ControlPortBase port)
: base(port)
{
}
/// <summary>
/// Creates a new instance of <see cref="ControlCallbackHandlerBase"/>.
/// </summary>
/// <param name="port">The <see cref="ControlPortBase"/>.</param>
protected ControlCallbackHandlerBase(ControlPortBase port)
{
this.WorkingPort = port;
}
internal static void SetChangeEventRequest(this ControlPortBase controlPort, MMAL_PARAMETER_CHANGE_EVENT_REQUEST_T value)
{
MMALCheck(MMALPort.mmal_port_parameter_set(controlPort.Ptr, &value.Hdr), "Unable to set camera event request.");
}
