public static CameraControlProtocolMessage StartRecording(DestinationDeviceType dst)
{
return(new CameraControlProtocolMessage(
dst,
Command.ChangeTransportMode,
new byte[] { 2, 0, 0, 0, 0 }
));
}
public static CameraControlProtocolMessage ManualLensFocusRelative(DestinationDeviceType dst, double offsetValue)
{
return(new CameraControlProtocolMessage(
dst,
Command.ManualLensFocusRelative,
Math.Max(-1.0, Math.Min(+1.0, offsetValue)).AsBlackmagicSignedFixedPoint16()
));
}
public static CameraControlProtocolMessage AutoFocus(DestinationDeviceType dst)
{
return(new CameraControlProtocolMessage(
dst,
Command.AutoLensFocus,
new byte[0]
));
}
public CameraControlProtocolMessage(
DestinationDeviceType destinationDeviceType,
Command command,
byte[] data
)
{
// padding with 32bit boundary
var length = command.Length;
var messageByteCount = 4 + (length / 4 + (length % 4 == 0 ? 0 : 1)) * 4;
var message = new byte[messageByteCount];
// Header
message[0] = (byte)destinationDeviceType;
message[1] = length;
message[2] = command.Id; // command id
message[3] = 0x00; // reserved
// Command
message[4] = command.Category; // category
message[5] = command.Parameter; // parameter
message[6] = command.DataType; // data type
message[7] = command.OperationType; // operation
// Command Data
var requiredDataLength = command.Length - 4;
if (data.Length != requiredDataLength)
{
throw new ArgumentException($"Invalid {nameof(data)} length.");
}
for (var idx = 0; idx < requiredDataLength; ++idx)
{
message[8 + idx] = data[idx];
}
Message = message;
}