Gets the number of scan lines in the video signal.
public int NumberOfLines { get; }
Public ReadOnly Property NumberOfLines As Integer
public:
property int NumberOfLines {
int get();
}
A value indicating the number of scan lines.
This property is updated with the number of scan lines in the video signal. The retrieved value is generally 525 lines for NTSC and 625 lines for PAL or SECAM.
For more detailed information, refer to the Microsoft documentation for IAMAnalogVideoDecoder.get_NumberOfLines.
using Leadtools;
using Leadtools.Multimedia;
using LeadtoolsMultimediaExamples.Fixtures;
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 the word "analog" in its name
// Replace "Analog" with the name of your tuner device
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 whether the 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 whether 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 whether VCR Horizontal Sync locking is enabled and set it 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 whether output enabled is set and set it 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 do not 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 19\Media";
}
Imports Leadtools
Imports Leadtools.Multimedia
Imports LeadtoolsMultimediaExamples.Fixtures
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 19\Media"
End Class
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