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Working with Compressed Video Data in a Stream
AVIFile provides several ways for you to access compressed video streams.
If you want to display one or more frames of a compressed video stream, you
can retrieve the frames by using the AVIStreamRead function and forwarding the compressed frame data to DrawDib functions to
display them. DrawDib functions can display images of several image depths and
automatically dither images for displays that cannot handle certain types of
device-independent bitmaps (DIBs). These functions work with uncompressed and
compressed images. For more information about DrawDib functions, see DrawDib Functions.
AVIFile provides functions for decompressing a single video frame. To allocate
resources, use the AVIStreamGetFrameOpen function. This function creates a buffer for the decompressed data.
You can decompress a single video frame by using the AVIStreamGetFrame function. This function decompresses the frame and retrieves a complete frame
of image data, returning the address of the DIB in the BITMAPINFOHEADER structure. Your application can display the DIB by using standard drawing
functions or by using the DrawDib functions.
If your application makes successive calls to AVIStreamGetFrame, the function overwrites its buffer with each retrieved frame.
When you finish using AVIStreamGetFrame and the decompressed DIB is in its buffer, you can release the allocated
resources by using the AVIStreamGetFrameClose function.
For more information about decompressing images, see Video Compression Manager.
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