FastestReverse Method

Imports Leadtools
Imports Leadtools.Multimedia
Imports LeadtoolsMultimediaExamples.Fixtures

''' <review>Khaledb 11_20_2013, Remove the "Uncompressed" read only properties that were giving false results (Audio and video) and use 
''' (Compressors.Selection = -1) Instead</review>
Public _result As Boolean = False
Public _form As ConvertCtrlForm = New ConvertCtrlForm()
Public _convertctrl As ConvertCtrl
Public _testing As Boolean
Public _startTimeCode As Integer
Public _stopTimeCode As Integer
Public Sub ReadTimecodeExample()
   ' reference the convert control
   _convertctrl = _form.ConvertCtrl

   ' input file
   Dim inFile As String = Path.Combine(LEAD_VARS.MediaDir, "ConvertCtrl_Source.avi")

   Try
      ' check to see if we have the desired target device
      If _convertctrl.TargetDevices("Microsoft DV Camera and VCR") Is Nothing Then
         Throw New Exception("No Microsoft DV Camera target devices available!")
      End If

      ' set the video capture device, use your capture device name here
      _convertctrl.SourceFile = inFile

      ' select video and audio compressors to none
      _convertctrl.VideoCompressors.Selection = -1
      _convertctrl.AudioCompressors.Selection = -1

      ' select the target format
      _convertctrl.TargetFormats(TargetFormatType.DVSD).Selected = True

      ' select only Audio for this example
      _convertctrl.AllowedStreams = StreamFormatType.AudioVideo

      ' set a target device
      _convertctrl.TargetDevices("Microsoft DV Camera and VCR").Selected = True

      ' check the target device VCRControl 
      If _convertctrl.TargetVCRControl Is Nothing OrElse (_convertctrl.TargetVCRControl.DeviceType = VCRControlDeviceType.NotPresent _
                                                          OrElse _convertctrl.TargetVCRControl.DeviceType = VCRControlDeviceType.Unknown) Then
         Throw New Exception("MS DV Camera's Target VCR control is not present!")
      End If

      ' subscribe to convert control events for VCR control input
      AddHandler _convertctrl.Started, AddressOf ConvertCtrl_Started
      AddHandler _convertctrl.Complete, AddressOf ConvertCtrl_Complete
      AddHandler _convertctrl.Progress, AddressOf ConvertCtrl_Progress
      AddHandler _convertctrl.KeyPress, AddressOf ConvertCtrl_KeyPress

      ' start the conversion
      _convertctrl.StartConvert()
   Catch e1 As Exception
      _result = False
   End Try

   ' we'll loop on the state and pump messages for this example.
   ' but you should not need to if running from a Windows Forms application.
   Do While _convertctrl.State = ConvertState.Running
      Application.DoEvents()
   Loop

   ' switch to playback and test
   _testing = True

   ' again, we'll loop and pump messages for this example for 
   ' playback testing, (setting _testing == true will exit)
   Do While _testing
      Application.DoEvents()
   Loop
End Sub

Private Sub ConvertCtrl_Started(ByVal sender As Object, ByVal e As EventArgs)
   ' start recording
   If _convertctrl.TargetVCRControl.Mode <> VCRControlMode.Record Then
      ' pause the graph to prevent frame loss
      _convertctrl.PauseConvert()
      ' start the record on the VCR control
      _convertctrl.TargetVCRControl.Record()
      ' resume graph now
      _convertctrl.RunConvert()
   End If

   ' get our VCR start timecode
   _startTimeCode = _convertctrl.TargetVCRControl.ReadTimecode()
End Sub

Private Sub ConvertCtrl_Complete(ByVal sender As Object, ByVal e As EventArgs)
   ' stop recording
   If _convertctrl.TargetVCRControl.Mode <> VCRControlMode.Stop Then
      _convertctrl.TargetVCRControl.Stop()
   End If

   ' get our VCR start timecode
   _stopTimeCode = _convertctrl.TargetVCRControl.ReadTimecode()

   ' set the result to what we expect
   _result = (_stopTimeCode > _startTimeCode)
End Sub

Private Sub ConvertCtrl_KeyPress(ByVal sender As Object, ByVal e As Leadtools.Multimedia.KeyPressEventArgs)
   ' if ok to perform playback functions 
   If _testing AndAlso Not _convertctrl.TargetVCRControl Is Nothing Then
      ' reference the target VCR control
      Dim vcr As VCRControl = _convertctrl.TargetVCRControl
      Select Case e.keyAscii
         Case CShort("*")
            ' seek to the beginning of the capture 
            If vcr.Mode <> VCRControlMode.Stop Then
               vcr.Stop()
            End If
            vcr.SeekTimecode(_startTimeCode)
         Case CShort("~")
            ' seek to the end of the capture
            If vcr.Mode <> VCRControlMode.Stop Then
               vcr.Stop()
            End If
            vcr.SeekTimecode(_stopTimeCode)
         Case CShort("p")
            ' start playback
            If vcr.Mode <> VCRControlMode.Play Then
               vcr.Play()
            End If
         Case CShort("s")
            ' skip ahead 1000 units from the current timecode 
            vcr.Pause()
            Dim tc As Integer = vcr.ReadTimecode()
            vcr.SeekTimecode(tc + 1000)
            vcr.Play()
         Case CShort("+")
            ' step forward one frame
            If vcr.Mode <> VCRControlMode.Pause Then
               vcr.Pause()
            End If
            vcr.StepForward()
         Case CShort("-")
            ' step backward one frame
            If vcr.Mode <> VCRControlMode.Pause Then
               vcr.Pause()
            End If
            vcr.StepBackward()
         Case CShort("f")
            ' slowest forward
            vcr.SlowestForward()
         Case CShort("r")
            ' slowest reverse
            vcr.SlowestReverse()
         Case CShort(">")
            ' fastest forward
            vcr.FastestForward()
         Case CShort("<")
            ' fastest reverse
            vcr.FastestReverse()
         Case CShort("x")
            ' stop playback and exit
            If vcr.Mode <> VCRControlMode.Stop Then
               vcr.Stop()
            End If
            _testing = False
      End Select
   End If
End Sub

Private Sub ConvertCtrl_Progress(ByVal sender As Object, ByVal e As ProgressEventArgs)
   If Not _convertctrl.TargetVCRControl Is Nothing Then
      ' reference the VCR control
      Dim vcr As VCRControl = _convertctrl.TargetVCRControl

      ' get the current time code
      Dim timeCode As Integer = vcr.ReadTimecode()
   End If
End Sub

Public NotInheritable Class LEAD_VARS
Public Const MediaDir As String = "C:\Program Files (x86)\LEAD Technologies\LEADTOOLS 19\Media"
End Class