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Capturing video with a web camera

From: Silverlight 5 Essential Training

Video: Capturing video with a web camera

I am going to talk about web cameras in Silverlight support. Stay tuned! I am in a project called WorkingWithwebCam. It's a very simple interface. I am in the MainPage.xaml file. I have two buttons: I have the Start webCam button and the Stop button. Plus I also have a rectangle in this area of the screen called webcamOutputRectangle. What I am going to do is capture the video from the camera and place it in this rectangle with a video brush. Let me show you the code for doing that. Press F7 look at the code behind.

Capturing video with a web camera

I am going to talk about web cameras in Silverlight support. Stay tuned! I am in a project called WorkingWithwebCam. It's a very simple interface. I am in the MainPage.xaml file. I have two buttons: I have the Start webCam button and the Stop button. Plus I also have a rectangle in this area of the screen called webcamOutputRectangle. What I am going to do is capture the video from the camera and place it in this rectangle with a video brush. Let me show you the code for doing that. Press F7 look at the code behind.

In that loaded event on this page I am creating a brand-new capture source. Then I am setting up two event procedures: one that fires when the capture fails, and the other fires when the capture image is complete. More important is this line of code here. This goes to the operating system that says GetDefaultVideoCaptureDevice on this computer. When I make that call, I will check to see if I did get a camera device back. It's possible there are no cameras installed in the user's computer. And once I get it, I'm going to do a little bit of code to set the video capture device to that web cam, generate a video brush, and then set the source to the camera, and then finally take their web cam brush and apply it to the output rectangle I showed you.

So that will start putting the pixels in that rectangle. Now I just need to start the camera and stop the camera. That's really easy to do. I go out to the computer and I ask for access to computer's camera. The user will be prompted with a dialog that asks if it's safe to turn on the camera. If they allow that access, then this code will run. And all I do in here is a captureSource.Start. I think it's pretty simple code. And I do almost the same thing when I am stopping that video and check to make sure I have a reference; If I do then I call Stop.

Let's see what it looks like. Press F5 and the application will run. I am going to click on the Start webCam. Here is the dialog I mentioned. Notice that there's a Remember my answer checkbox here? If the user clicks Remember my answer and then chooses Yes thennext time I ask for camera access, it will automatically be granted. There I am. Hi! This is my booth here at lynda.com. I will just click Stop.

Notice that it takes the last frame and keeps that painted inside the rectangle. I think we can probably do some more interesting applications than just a video stream like that. And to show you an example, I am going to use something from the coding for fun web site called SilverShader. I am going to go head and say File > Open > Project. I'm in the same folder as the working with web cam. I am going to open up the SilverShader folder and then SilverShader again and then Solution and then this SLN file.

I am going to start up the application, and what this does is it takes the video stream and runs it through a pixel shader first before showing it on the screen. So I am going to come down here and click on the Capture button. Approve the access. And here I am again, but this time it's applying a circular shader to the output. So I can change the circle Sizes, Circle Min and Max. I can choose from other. I don't like this edge detection which has kind of a scary look to it.

I can also pick this one down here. It's called Old Movie. It kind of looks like an old tint type movie there. I could control the number of scratches on the screen. I can also control the amount of noise its showing. There is a few other for you to check out in this demo. I highly encourage you to look at running source code. There is some very interesting stuff in this example. Let me stop it here and then return back to Visual Studio. Uploading videos to your server is a common request. One idea a lot of developers have when they first see web cam support in Silverlight is that you could build some sort of video chat program.

That's difficult to do in Silverlight currently due to codec issues. The basic problem is that you can capture the video but you have no built-in way of encoding or compressing it before sending it to the server. As you can imagine, uploading a massive AV file is not a test you want to tackle lightly. Microsoft and other parties are working in this area, but there's nothing ready yet.

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This video is part of

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Silverlight 5 Essential Training

106 video lessons · 5571 viewers

Walt Ritscher
Author

 
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  1. 1m 41s
    1. Welcome
      53s
    2. Using the exercise files
      48s
  2. 35m 0s
    1. Overview of Silverlight
      3m 29s
    2. Setting up a developer computer
      2m 46s
    3. Installing the Silverlight Toolkit
      2m 21s
    4. Exploring the toolkit samples
      2m 35s
    5. Using Visual Studio 2010 to create a Silverlight project
      5m 10s
    6. Using Expression Blend to create a Silverlight project
      3m 13s
    7. Getting to know the Visual Studio interface
      8m 15s
    8. Working in the Expression Blend interface
      7m 11s
  3. 29m 46s
    1. Understanding the Visual Studio project structure
      3m 38s
    2. Creating a Silverlight page
      3m 17s
    3. Compiling your first application
      5m 0s
    4. Using other assemblies in an application
      5m 45s
    5. Deploying a Silverlight application
      3m 43s
    6. Understanding the startup process for an application
      3m 13s
    7. Understanding how users get Silverlight on their computers
      5m 10s
  4. 16m 59s
    1. Exploring the relationship between XAML and .NET
      3m 57s
    2. Using C#
      7m 16s
    3. Exploring the code-behind file
      5m 46s
  5. 43m 22s
    1. Working with XAML elements and Property attributes
      4m 56s
    2. Investigating XAML namespaces
      7m 31s
    3. Converting XAML properties with TypeConverters
      5m 1s
    4. Working with Property elements
      4m 24s
    5. Assigning runtime data with XAML markup extensions
      4m 21s
    6. Digging into the dependency property system
      6m 12s
    7. Creating a custom dependency property
      4m 42s
    8. Understanding attached properties
      6m 15s
  6. 9m 35s
    1. Debugging your code
      5m 17s
    2. Special Silverlight debugging techniques
      4m 18s
  7. 36m 0s
    1. Understanding layout
      4m 55s
    2. Using DockPanel and WrapPanel
      4m 2s
    3. Exploring sophisticated layouts with the Grid
      6m 40s
    4. Absolute positioning with the Canvas panel
      5m 20s
    5. Scrolling content with the ScrollViewer
      3m 28s
    6. Adjusting content alignment, margins, and sizing
      5m 6s
    7. Using the TabControl
      2m 17s
    8. Manipulating elements with transforms
      4m 12s
  8. 20m 32s
    1. Painting the user interface (UI) with SolidColorBrush
      6m 7s
    2. Getting colorful with gradient brushes
      3m 15s
    3. Decorating elements with ImageBrush
      4m 56s
    4. Creating effects with VideoBrush
      6m 14s
  9. 25m 42s
    1. Understanding routed events
      3m 12s
    2. Wiring up event handlers in Silverlight
      6m 4s
    3. Understanding event bubbling
      4m 39s
    4. Exploring mouse events
      7m 43s
    5. Exploring keyboard events
      4m 4s
  10. 32m 31s
    1. Displaying text on the screen
      3m 24s
    2. Gathering text input from the user
      5m 30s
    3. Showing complex text with RichTextBox
      6m 7s
    4. Understanding text overflow and text linking
      3m 14s
    5. Searching content with the AutoComplete type-ahead control
      6m 45s
    6. Using and embedding Silverlight fonts
      7m 31s
  11. 26m 47s
    1. Understanding content controls
      5m 7s
    2. Understanding button controls
      6m 16s
    3. Using the BusyIndicator
      4m 40s
    4. Showing tooltips
      4m 34s
    5. Changing content size with ViewBox
      1m 39s
    6. Exploring more controls
      4m 31s
  12. 55m 36s
    1. Connecting elements with binding
      9m 54s
    2. Using business data in a binding
      9m 21s
    3. Listing data with ItemsControls
      6m 39s
    4. Digging into the DataGrid
      8m 28s
    5. Using the DataForm
      3m 49s
    6. Storing data on the client
      7m 10s
    7. Debugging XAML bindings
      5m 41s
    8. Charting data
      4m 34s
  13. 24m 36s
    1. Creating an Out-of-Browser (OOB) application
      6m 16s
    2. Controlling aspects of an OOB application
      2m 49s
    3. Alerting the user with notification windows
      7m 13s
    4. Hosting HTML content in Silverlight applications
      8m 18s
  14. 30m 2s
    1. Exploring Silverlight trust levels
      3m 51s
    2. Creating an elevated trust application
      5m 57s
    3. Reaping the benefits of XAP signing
      6m 5s
    4. Making cross-domain calls
      5m 1s
    5. Getting started with COM Interop using the Speech API
      4m 21s
    6. Using COM Interop to interact with Microsoft Office
      4m 47s
  15. 16m 33s
    1. Showing child windows
      3m 48s
    2. Using a child window as a dialog window
      5m 7s
    3. Creating native windows
      2m 53s
    4. Maximizing a window with full screen mode
      4m 45s
  16. 13m 20s
    1. Dynamically loading UI content with user controls
      4m 46s
    2. Using the Navigation Framework
      8m 34s
  17. 9m 28s
    1. Using resource files
      3m 53s
    2. Using images in an application
      5m 35s
  18. 16m 32s
    1. Playing audio
      4m 27s
    2. Playing sound effects
      5m 4s
    3. Viewing video content with MediaElement
      4m 58s
    4. Changing video playback speed with TrickPlay
      2m 3s
  19. 14m 40s
    1. Capturing video with a web camera
      4m 16s
    2. Working with a microphone
      3m 47s
    3. Creating print output
      6m 37s
  20. 22m 35s
    1. Understanding Silverlight animations
      4m 35s
    2. Creating animations
      7m 52s
    3. Controlling animations
      4m 18s
    4. Simulating physics with animation easings
      5m 50s
  21. 27m 47s
    1. Placing XAML resources within a FrameworkElement
      6m 47s
    2. Centralizing settings in styles
      4m 8s
    3. Creating an alternate control UI with ControlTemplates
      6m 29s
    4. Dressing up your data with DataTemplates
      4m 33s
    5. Explaining the VisualStateManager: a simple way to manage control states
      5m 50s
  22. 10m 55s
    1. Handling global errors in a Silverlight application
      5m 46s
    2. Showing an application loading screen
      5m 9s
  23. 10m 48s
    1. Integrating with XNA
      7m 40s
    2. Exploring data analysis with PivotViewer
      3m 8s
  24. 1m 6s
    1. Goodbye
      1m 6s

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