Creating a Media Foundation Capture Application

Take the following steps to create and run a multimedia capture application using the LEADTOOLS Media Foundation CaptureCtrl control.

  1. Start Visual Studio.

  2. Choose File->New->Project... from the menu.

  3. In the New Project dialog box, choose either "Visual C# Projects" or "VB Projects" in the Projects Type List, and choose "Windows Application " in the Templates List.

  4. Type the project name as "Multimedia Capture" in the Project Name field, and then choose OK. If desired, type a new location for your project or select a directory using the Browse button, and then choose OK.

  5. In the "Solution Explorer" window, right-click on the "References" folder, and select "Add Reference..." from the context menu. In the "Add Reference" dialog box, select the ".NET" tab and select Leadtools.MediaFoundation and click OK. If this DLL does not appear under the .NET tab, you will need select the Browse tab and add it from the "<LEADTOOLS_INSTALLDIR>\Bin\Dotnet\Win32 " folder, by selecting the following DLL:

    • Leadtools.MediaFoundation.dll

    After browsing, click the Select button and then press the OK button to add the above DLL to the application.

  6. Make sure Form1 is in design view. Go to the toolbox (View->Toolbox) and drag and drop a CaptureCtrl control on the form. NOTE: If you do not have CaptureCtrl in your toolbox, select Tools->Choose Toolbox Items from the menu. Click Browse and then select Leadtools.MediaFoundation.dll from "<LEADTOOLS_INSTALLDIR>\Bin\Dotnet\Win32" and then click Open and then click OK. After adding it to the form, set the following properties on the capture control:

    Property Value
    Name _capturectrl
    Anchor Top, Bottom, Left, Right
  7. Go to the toolbox (View->Toolbox) and drag and drop a ProgressBar control on the form (below the capture control) and set the following properties:

    Property Value
    Name _progress
    Anchor Bottom, Left, Right
  8. Go to the toolbox (View->Toolbox) and drag and drop a Button control on the bottom of the form and set the following properties:

    Property Value
    Name _buttonCapture
    Text Capture
    Anchor Bottom, Right
  9. Switch Form1 to code view (right-click Form1 in the solution explorer then select View Code) and add the following lines at the beginning of the file:

    VB
    Imports Leadtools.MediaFoundation 
                     
         

    C#
    using Leadtools.MediaFoundation; 
                     
         

  10. Declare the following private variables:

    VB
    Private _targetFile As String 
    Private _captureTime As Integer 
                     
         

    C#
    private string _targetFile; 
    private int _captureTime; 
                     
         

  11. Add an event handler to the Form1 Load event and code it as follows:

    VB
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load 
       If (_capturectrl.VideoDevices.Count = 0) Then 
          Throw New Exception("No capture devices available") 
       End If 
                           
       _capturectrl.VideoDevices(0).Selected = True 
       _capturectrl.TargetFormats.Selection = TargetFormatType.MP4    
       Dim trgvideoformats As TargetVideoFormats = _capturectrl.TargetFormats(TargetFormatType.MP4).VideoFormats 
       targetvideoformats.Selection = targetvideoformats.IndexOf("{34363248-0000-0010-8000-00AA00389B71}") ' // H264 
                        
       _targetFile = "capture.mp4" 
       _captureTime = 30 
    End Sub 
                     
         

    C#
    private void Form1_Load(object sender, System.EventArgs e) 
    { 
       if (_capturectrl.VideoDevices.Count == 0) 
          throw new Exception("No capture devices available"); 
                           
       _capturectrl.VideoDevices[0].Selected = true; 
       _capturectrl.TargetFormats.Selection = (int)TargetFormatType.MP4; 
       TargetVideoFormats targetvideoformats = _capturectrl.TargetFormats[TargetFormatType.MP4].VideoFormats; 
       targetvideoformats.Selection = targetvideoformats.IndexOf("{34363248-0000-0010-8000-00AA00389B71}");// H264 
                        
       _targetFile = "capture.mp4"; 
       _captureTime = 30; 
    } 
                     
         

  12. Add an event handler to the _capturectrl Progress event and code it as follows:

    VB
    Private Sub _capturectrl_Progress(ByVal sender As System.Object, ByVal e As ProgressEventArgs) Handles _capturectrl.Progress 
       _progress.Value = CInt((_progress.Maximum * e.time) / (_captureTime * 1000)) 
    End Sub 
                     
         

    C#
    private void _capturectrl_Progress(object sender, ProgressEventArgs e) 
    { 
       _progress.Value = (int)((_progress.Maximum * e.time) / (_captureTime * 1000)); 
    } 
                     
         

  13. Add an event handler to the _capturectrl Complete event and code it as follows:

    VB
    Private Sub _capturectrl_Complete(ByVal sender As System.Object, ByVal e As EventArgs) Handles _capturectrl.Complete 
       MessageBox.Show("Capture Complete") 
       _buttonCapture.Enabled = True 
    End Sub 
                     
         

    C#
    private void _capturectrl_Complete(object sender, EventArgs e) 
    { 
       MessageBox.Show("Capture Complete"); 
       _buttonCapture.Enabled = true; 
    } 
                     
         

  14. Add an event handler to the _buttonCapture Click event and code it as follows:

    VB
    Private Sub _buttonCapture_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles _buttonCapture.Click 
       Try 
          _capturectrl.Preview = True 
          _capturectrl.TargetFile = _targetFile 
          _capturectrl.UseTimeLimit = True 
          _capturectrl.TimeLimit = _captureTime 
                           
          _capturectrl.StartCapture(CaptureMode.Video) 
          _buttonCapture.Enabled = False 
       Catch ex As Exception 
          MessageBox.Show(ex.Message) 
       End Try 
    End Sub    
                     
         

    C#
    private void _buttonCapture_Click(object sender, System.EventArgs e) 
    { 
       try 
       { 
          _capturectrl.Preview = true; 
          _capturectrl.TargetFile = _targetFile; 
          _capturectrl.UseTimeLimit = true; 
          _capturectrl.TimeLimit = _captureTime; 
                           
          _capturectrl.StartCapture(CaptureMode.Video); 
          _buttonCapture.Enabled = false; 
       } 
       catch (Exception ex) 
       { 
          MessageBox.Show(ex.Message); 
       } 
    } 
                     
         

  15. Build, and Run the program to test it.

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