 data plane
can be determined using buf.nline, buf.nsample and sizeof the
datatype field. It can be used for bulk transfers. There is also a
row vector (Illiffe vector) pointing to each row of the main array to
support C bracket [] index notation for a 2D-array. It can be
ignored. The structure does maintain dynamic memory, so use
MtkDataBufferFree when finished with this structure.</P>
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