## MMPM/2 Device Driver Reference

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### MCI_AUDIO_BUFFER Field - ulPositionType

ulPositionType (ULONG) Specifies the type of position units. The defined values for this field are:

    POS_MSECS       0    /* Position units in milliseconds

                            since start                            */

    MIDI_CLOCKS     1    /* Position units in # of MIDI clocks

                            since start                            */

    POS_BYTES       2    /* Position data in bytes                 */

    SMPTE_24       24    /* Position corresponds with SMPTE 24

                            frames/sec                             */

    SMPTE_25       25    /* Position corresponds with SMPTE 25

                            frames/sec                             */

    SMPTE_30DF     29    /* Position corresponds with SMPTE 30

                            drop frame                             */

    SMPTE_30       30    /* Position corresponds with SMPTE 30

                            frames/sec                             */