Windows Media Player 11 SDK Implementing an Audio DSP Plug-in
.gif)
| Previous | Next |
Implementing an Audio DSP Plug-in
To create a Windows Media Player DSP plug-in that processes audio, you'll need to modify the sample code in the function named DoProcessOutput. DoProcessOutput is called each time Windows Media Player successfully calls IMediaObject::ProcessOutput. It is the function that performs the digital signal processing tasks that produce the audible result that the DSP plug-in is intended to produce.
Processing an audio stream is like handling a timed event. DoProcessOutput will be called repeatedly and at specific intervals. Each time your code executes, it will need to process a specific number of bytes of data. DoProcessOutput contains the following parameters:
| Parameter | Description |
| pbOutputData | This is a BYTE pointer to the buffer where your implementation of DoProcessOutput must copy its processed data. |
| pbInputData | This is a constant BYTE pointer to the buffer that contains the data to be processed. |
| cbBytesToProcess | This is a DWORD value that contains a count of the number of bytes in the input buffer to be processed. |
The following sections provide details about how to modify the code generated by the Windows Media Player Plug-in Wizard to create your own audio DSP plug-in:
- Implementing DoProcessOutput
- Adding Properties to the Sample Audio DSP Plug-in
- Implementing the Property Page for a DSP Plug-in
- Changing the Sample Audio DSP Plug-in Property
- About Discontinuity
- About Allocating Streaming Resources
See Also
| Previous | Next |