WavSource Sample

Shows how to create a custom media source in Microsoft Media Foundation. The sample implements a media source that parses .wav audio files.

This sample is a relatively simple example of a media source:

  • There is only one stream, so there is no code to implement stream selection.
  • The media source does not implement rate control (that is, fast forward or reverse playback).
  • All source and stream methods are implemented as synchronous methods.
  • Because the data portion of a .wav file is a single block of uncompressed PCM audio, the media source does not need to read packet headers or otherwise parse the stream during playback, other than reading the initial WAVEFORMAT header.

For a more advanced example of a media source, see the MPEG1Source Sample.

APIs Demonstrated

This sample demonstrates the following Media Foundation interfaces:

Usage

The WavSource sample builds a DLL that is a COM server for both the media source and media source's byte-stream handler. Before using the media source, you must register the DLL.

To use the media source, you can run the BasicPlayback. The source resolver will automatically load the media source if you select a .wav file for playback. (If an error occurs, make sure that you successfully registered the WavSource DLL.)

You can also use the TopoEdit tool to build a playback topology that contains the media source. For more information about TopoEdit, see TopoEdit.

Requirements

ProductVersion
Windows SDKWindows Vista
Microsoft WindowsWindows Vista

 

Downloading the Sample

This sample is available in the following locations.

LocationPath/URL
Windows SDKSDK Root\Samples\multimedia\mediafoundation\wavsource
MSDN Code GalleryDownload from MSDN Code Gallery

 

Related topics

Media Foundation SDK Samples
Media Sources
MPEG1Source Sample
Scheme Handlers and Byte-Stream Handlers
Writing a Custom Media Source

 

 

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