Video Capture: A Minimal Approach
Video capture digitizes a stream of video and audio data, and stores it on a
hard disk or some other type of persistent storage device. This section
describes how to add a simple form of video capture to an application using three
statements of code. It also describes how to end or abort a capture session by
sending messages to the capture window.
An AVICap capture window handles the details of streaming audio and video
capture to AVI files. This frees your application from involvement in the AVI file
format, video and audio buffer management, and the low-level access of video
and audio device drivers. AVICap provides a flexible interface for applications.
You can add video capture to your application, using only the following lines
of code:
hWndC = capCreateCaptureWindow ( "My Own Capture Window",
WS_CHILD | WS_VISIBLE , 0, 0, 160, 120, hwndParent, nID);
SendMessage (hWndC, WM_CAP_DRIVER_CONNECT, 0 /* wIndex */, 0L);
SendMessage (hWndC, WM_CAP_SEQUENCE, 0, 0L);
A macro interface is also available that provides an alternative to using the
SendMessage function and improves the readability of an application. The following
example uses the macro interface to add video capture to an application.
hWndC = capCreateCaptureWindow ( "My Own Capture Window",
WS_CHILD | WS_VISIBLE , 0, 0, 160, 120, hwndParent, nID);
capDriverConnect (hWndC, 0);
capCaptureSequence (hWndC);
After your application creates a capture window of the AVICap window class and
connects it to a video driver, the capture window is ready to capture data. At
this point, your application can simply send the
WM_CAP_SEQUENCE message (or the
capCaptureSequence macro) to begin capturing.
Using default settings, WM_CAP_SEQUENCE initiates the capture of video and
audio input to a file named CAPTURE.AVI. Capture continues until one of the
following events occurs:
- The user presses the ESC key or a mouse button.
- Your application stops or aborts capture operation.
- The disk becomes full.
In an application, you can stop streaming captured data to a file by sending
the
WM_CAP_STOP (or the
capCaptureStop macro) message to a capture window. You can also abort the capture operation
by sending the
WM_CAP_ABORT message (or the
capCaptureAbort macro) to a capture window.
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