Microsoft KB Archive/154789

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AVI Playback (Streaming) onto DirectDraw Surface

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Q154789

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The information in this article applies to:


 * Microsoft Windows Software Development Kit (SDK) 3.1

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SUMMARY
The AVIDD95 sample demonstrates streaming of video data from an Audio- Video Interleaved (.AVI) file onto a full screen DirectDraw surface (Mode X). It plays the video as fast as possible. The maximum video size supported by the sample is 320x240 and the bit depth is dithered down to 8-bit regardless of the current video mode. This sample includes all source code and supporting files (.mak, .mdp, etc.) as the sample was developed using Microsoft's Visual C++ 4.x Developer Studio. In order to build the sample, the development environment must include the DirectX 2 SDK.

MORE INFORMATION
The following files are available for download from the Microsoft Download Center:

Avidd95.exe

For additional information about how to download Microsoft Support files, click the article number below to view the article in the Microsoft Knowledge Base:

"Q119591 How to Obtain Microsoft Support Files from Online Services" Microsoft used the most current virus detection software available on the date of posting to scan this file for viruses. Once posted, the file is housed on secure servers that prevent any unauthorized changes to the file.

AVIDD95 uses the following steps to stream the video onto the DirectDraw surface:


 * 1) Opens the video stream from an .AVI file by means of the AVIStreamOpenFromFile.
 * 2) Reads the source video stream format by means of the AVIStreamReadFormat.
 * 3) Reads a frame from the video stream by means of the AVIStreamRead.
 * 4) Converts the frame from the source format to the target format.
 * 5) Draws the decompressed frame by means of the standard DirectDraw calls.
 * 6) Repeat steps 3-5 for every frame (found by AVIStreamLength).

In AVIDD95, Mode X is utilized exclusively, requiring the video stream to be decompressed and dithered down from the native format, such as 16-bit or 24-bit, to 8-bit RGB. Decompression and dithering is accomplished by calling ICDecompress before passing the frame on to the drawing routine.

Additional query words: DD kbdsd Win95 multimedia kbfile

Keywords : kbfile kbmm kbsample kbSDKWin32

Issue type : kbinfo

Technology : kbAudDeveloper kbWin3xSearch kbSDKSearch kbWinSDKSearch kbWinSDK310