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WIDM_ADDBUFFER
 
        This message is sent to a waveform input device driver to add a
        buffer to the input queue.
 
Parameters
        DWORD dwParam1
            Specifies a far pointer to a WAVEHDR data structure
            identifying the buffer.
 
        DWORD dwParam2
            Specifies the size of the WAVEHDR structure.
 
Return value
        The return value is an error code, or zero (MMSYSERR_NOERROR) if
        the operation is successful. Possible error codes are:
 
        MMSYSERR_NOTENABLED
            The driver failed to load or initialize.
 
        WAVERR_UNPREPARED
            The specified data buffer has not been prepared for input.
 
Comments
        The driver should first check the WHDR_PREPARED bit in the
        dwFlags field of the WAVEHDR structure. If the bit is not set,
        the driver should return WAVERR_UNPREPARED. The driver should
        clear the WHDR_DONE bit and set the WHDR_INQUEUE bit in the
        header structure, and place the data block in its play queue.
        Then the driver should return control to the client by returning
        MMSYSERR_NOERROR. Input to the buffer should occur as an interrupt-
        driven process. If data is received without any buffers in the
        input queue, the data should be ignored without notifying the
        client.
 
        Recording begins when the driver receives a WIDM_START message.
        Once the data block has been filled with data, the driver should
        set the WHDR_DONE bit and clear the WHDR_INQUEUE bit before
        notifying the client by using DriverCallback to send a
        WIDM_DONE message.
 
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