Public ReadOnly Property NumberOfLines As Integer

Dim instance As AnalogVideoDecoder
Dim value As Integer
 
value = instance.NumberOfLines

public int NumberOfLines {get;}

public:
property int NumberOfLines {
   int get();
}

Public _result As Boolean = False
      Public _form As CaptureCtrlForm = New CaptureCtrlForm()
      Public Sub AvailableTVFormatsExample()
         Try
            ' reference the forms capture control
            Dim capturectrl As CaptureCtrl = _form.CaptureCtrl

            Dim outFile As String = Path.Combine(LEAD_VARS.MediaDir, "AnalogVideoDecoder_AvailableTVFormatsExample.avi")
            Dim lines As Integer = 0
            Dim allResults As Boolean = True

            ' select the first device with analog in it's name
            ' Replace "Analog" with your tuner device name
            If capturectrl.VideoDevices("Analog") Is Nothing Then
               Throw New Exception("No analog video capture device available")
            End If

            capturectrl.VideoDevices("Analog").Selected = True

            Dim analogvideodecoder As AnalogVideoDecoder = capturectrl.AnalogVideoDecoder
            Dim availableFormats As AnalogVideoStandard = analogvideodecoder.AvailableTVFormats
            Dim tvFormat As AnalogVideoStandard = analogvideodecoder.TVFormat

            ' Check if format is NTSC and set it if not
            If tvFormat <> AnalogVideoStandard.NTSC_M_J AndAlso (availableFormats And AnalogVideoStandard.NTSC_M_J) = AnalogVideoStandard.NTSC_M_J Then
               ' set the analog video decoder TV format
               analogvideodecoder.TVFormat = AnalogVideoStandard.NTSC_M_J

               ' check the changed format
               allResults = allResults And (analogvideodecoder.TVFormat = AnalogVideoStandard.NTSC_M_J)
            End If

            ' Check if Horizontal Locked is enabled
            Dim vLocked As Boolean = capturectrl.AnalogVideoDecoder.HorizontalLocked

            ' Some video device's Analog Decoder implementations do not
            ' support the following properties, so we wrap these property 
            ' accesses with a special try block to catch possible exceptions
            Try
               ' Check if VCR Horizontal Sync locking is enabled and set if not
               Dim vcrLocked As Boolean = capturectrl.AnalogVideoDecoder.VCRHorizontalLocking
               If (Not vcrLocked) Then
                  ' set VCR horzontal sync locking
                  capturectrl.AnalogVideoDecoder.VCRHorizontalLocking = True

                  ' include this as one of our checks
                  allResults = allResults And capturectrl.AnalogVideoDecoder.VCRHorizontalLocking
               End If

               ' Check if output enabled is set and set if not
               Dim outputEnabled As Boolean = capturectrl.AnalogVideoDecoder.OutputEnable
               If (Not outputEnabled) Then
                  ' enable output
                  capturectrl.AnalogVideoDecoder.OutputEnable = True

                  ' include this as one of our checks
                  allResults = allResults And capturectrl.AnalogVideoDecoder.OutputEnable
               End If
            Catch cex As COMException
               ' if the device does not support the properties above
               ' skip it and dont fail
               If cex.ErrorCode <> CInt(ErrorCode.E_PROP_ID_UNSUPPORTED) AndAlso cex.ErrorCode <> CInt(ErrorCode.E_PROP_SET_UNSUPPORTED) Then
                  Throw cex
               End If
            End Try

            Dim tries As Integer = 0

            ' check scan line count a few times 
            ' initial frames may differ from format spec, until frame data 
            ' has propogated through the capture graph
            Do While lines <> 525 AndAlso tries < 10
               ' get the number of scan lines in the output format
               lines = capturectrl.AnalogVideoDecoder.NumberOfLines
               System.Diagnostics.Debug.WriteLine("TV Format: " & analogvideodecoder.TVFormat.ToString() & ", Scan Lines: " & lines.ToString())
               tries += 1
            Loop

            ' include the line count check
            allResults = allResults And (lines = 525 AndAlso tries < 10)
            System.Diagnostics.Debug.WriteLine("Tries: " & tries.ToString())

            ' test results
            _result = allResults
         Catch e1 As Exception
            _result = False
         End Try
      End Sub

Public NotInheritable Class LEAD_VARS
   Public Const MediaDir As String = "C:\Program Files (x86)\LEAD Technologies\LEADTOOLS 17\Media"
End Class

public bool _result = false;
      public CaptureCtrlForm _form = new CaptureCtrlForm();
      public void AvailableTVFormatsExample()
      {
         try
         {
            // reference the forms capture control
            CaptureCtrl capturectrl = _form.CaptureCtrl;

            string outFile = Path.Combine(LEAD_VARS.MediaDir, "AnalogVideoDecoder_AvailableTVFormatsExample.avi");
            int lines = 0;
            bool allResults = true;

            // select the first device with analog in it's name
            // Replace "Analog" with your tuner device name
            if (capturectrl.VideoDevices["Analog"] == null)
               throw new Exception("No analog video capture device available");

            capturectrl.VideoDevices["Analog"].Selected = true;

            AnalogVideoDecoder analogvideodecoder = capturectrl.AnalogVideoDecoder;
            AnalogVideoStandard availableFormats = analogvideodecoder.AvailableTVFormats;
            AnalogVideoStandard tvFormat = analogvideodecoder.TVFormat;

            // Check if format is NTSC and set it if not
            if (tvFormat != AnalogVideoStandard.NTSC_M_J
               && (availableFormats & AnalogVideoStandard.NTSC_M_J) == AnalogVideoStandard.NTSC_M_J)
            {
               // set the analog video decoder TV format
               analogvideodecoder.TVFormat = AnalogVideoStandard.NTSC_M_J;

               // check the changed format
               allResults &= (analogvideodecoder.TVFormat == AnalogVideoStandard.NTSC_M_J);
            }

            // Check if Horizontal Locked is enabled
            bool vLocked = capturectrl.AnalogVideoDecoder.HorizontalLocked;

            // Some video device's Analog Decoder implementations do not
            // support the following properties, so we wrap these property 
            // accesses with a special try block to catch possible exceptions
            try
            {
               // Check if VCR Horizontal Sync locking is enabled and set if not
               bool vcrLocked = capturectrl.AnalogVideoDecoder.VCRHorizontalLocking;
               if (!vcrLocked)
               {
                  // set VCR horzontal sync locking
                  capturectrl.AnalogVideoDecoder.VCRHorizontalLocking = true;

                  // include this as one of our checks
                  allResults &= capturectrl.AnalogVideoDecoder.VCRHorizontalLocking;
               }

               // Check if output enabled is set and set if not
               bool outputEnabled = capturectrl.AnalogVideoDecoder.OutputEnable;
               if (!outputEnabled)
               {
                  // enable output
                  capturectrl.AnalogVideoDecoder.OutputEnable = true;

                  // include this as one of our checks
                  allResults &= capturectrl.AnalogVideoDecoder.OutputEnable;
               }
            }
            catch (COMException cex)
            {
               // if the device does not support the properties above
               // skip it and dont fail
               if (cex.ErrorCode != (int)ErrorCode.E_PROP_ID_UNSUPPORTED
                  && cex.ErrorCode != (int)ErrorCode.E_PROP_SET_UNSUPPORTED)
                  throw cex;
            }

            int tries = 0;

            // check scan line count a few times 
            // initial frames may differ from format spec, until frame data 
            // has propogated through the capture graph
            while (lines != 525 && tries++ < 10)
            {
               // get the number of scan lines in the output format
               lines = capturectrl.AnalogVideoDecoder.NumberOfLines;
               System.Diagnostics.Debug.WriteLine("TV Format: " + analogvideodecoder.TVFormat.ToString() + ", Scan Lines: " + lines.ToString());
            }

            // include the line count check
            allResults &= (lines == 525 && tries < 10);
            System.Diagnostics.Debug.WriteLine("Tries: " + tries.ToString());

            // test results
            _result = allResults;
         }
         catch (Exception)
         {
            _result = false;
         }
      }

static class LEAD_VARS
{
   public const string MediaDir = @"C:\Program Files (x86)\LEAD Technologies\LEADTOOLS 17\Media";
}