About 

The player calls this function when the user requests information about the plug-in. 

Configure 

The player will call this function when the user wants to configure the plug-in. 

Drain 

The player calls this function to wait for all written data to be rendered. 

DrainCancel 

The player calls this function to cancel any Drain requests currently in action. 

Flush 

The player calls this function to clear any audio data written to the plug-in. 

GetCurrentPosition 

The player calls this function to determine the precise playback position of the audio. 

Initialize 

The player calls this function to initialize the plug-in. 

Open 

The player calls this function to prepare the plug-in to render audio data. 

Pause 

The player calls this function to pause or resume rendering in the plug-in. 

SetEQ 

The player calls this function when the equalizer settings have changed. 

SetVolume 

The player calls this function when the volume or balance settings have changed. 

Stop 

The player call this function when the audio decoding for the current media has completed. 

ShutDown 

The player calls this function to shutdown the plug-in. 

TestFormat 

The player calls this function to test an audio format for support by the Playback module. 

Write 

The player calls this function to pass audio data for rendering. 

Reserved 

Used internally or reserved for future expansion