PMIXEREVENT

Pointer to a mixer-event callback function.

typedef MIXEREVENT *PMIXEREVENT;

In the header file, this is a two-part definition as shown below:

typedef LONG (APIENTRY MIXEREVENT)
               (ULONG           ulStatus,
                PMCI_MIX_BUFFER pBuffer,
                ULONG           ulFlags);

typedef MIXEREVENT *PMIXEREVENT;

Valid values for ulFlags are:

• MIX_STREAM_ERROR
  
• MIX_READ_COMPLETE
  
• MIX_WRITE_COMPLETE

Valid values for ulStatus are:

• ERROR_DEVICE_UNDERRUN 
  ERROR_DEVICE_OVERRUN

  Note:

  For ulStatus to be set, the value of ulFlags must be MIX_STREAM_ERROR.

  MIX_STREAM_ERROR will not be set without a previous MIX_READ_COMPLETE or MIX_WRITE_COMPLETE.

  The event handler will not be called unless a value has been returned for ulFlags.

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