Commands the stream handler to seek to a specified point in the stream. The lSeekPoint can be represented in MMTIME format.
The lSeekPoint can be passed as an absolute or a relative seek position. The stream handler must return the absolute seek point in this field. Stream handlers that perform physical device seeks receive the SPI_SEEK_FROMEND flag if it was passed on the SpiSeekStream call from the application or media control device. Stream handlers that do not perform physical device seeks do not receive this flag. A stream handler must specify in the stream protocol whether it performs a physical seek.