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Echo Sample Overview
This guide builds a Windows Media Player DSP plug-in that creates an echo effect in PCM audio during playback. The goals for the plug-in are as follows:
- The plug-in processes 8-bit or 16-bit PCM audio only.
- It supports a delay time between 10 milliseconds (ms) and 2000 ms (2 seconds). This represents a practical range for most applications.
- It supports mixing of the original signal with the delay signal.
- It provides a property page implementation that allows the user to provide a value for the delay time and a value for the percentage of delay signal relative to the overall audio signal level.
- The code is created by modifying the Windows Media Player Plug-in Wizard audio DSP plug-in sample.
The Echo sample is not included with the Windows Media Player SDK; it is a sample that you create. To create the Echo sample, you must start with the default project from the Windows Media Player Plug-in Wizard. You can name the project whatever you like; this documentation assumes the project is named Echo. For details about using the wizard, see Building a DSP Plug-in.
The following section provides an overview of how the sample creates an echo effect:
See Also
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