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       xdf_define_arrays - Specify the number of input/output arrays


       #include <xdfio.h>

       int xdf_define_arrays(struct xdf* xdf,
                             unsigned int narrays, const size_t *strides);


       xdf_define_arrays()  specifies the number of arrays and its strides for
       upcoming  calls  to  xdf_write(3)  and  xdf_read(3)  using  xdf.   This
       function  is  used to configure the upcoming transfer. As such, it must
       be called before xdf_prepare_transfer(3) (calling it after will produce
       an  error).  However  the function may be called several times but only
       the last call is meaningful for the transfer.

       narrays specifies the number of arrays that will  be  provided  in  the
       argument list of xdf_write(3) or xdf_read(3).

       strides  argument  should  point  to  an  array of narrays unsigned int
       corresponding respectively to the stride of each arrays  that  will  be
       supplied  to  the  upcoming  call  to xdf_write(3) or xdf_read(3).  The
       stride corresponds to  the  length  in  byte  between  two  consecutive
       samples of the same channel in the array.


       xdf_define_arrays()  returns  0  in  case  of success, otherwise -1 and
       errno is set appropriately.


       ENOMEM The system is unable to allocate resources.


       xdf_prepare_transfer(3), xdf_read(3), xdf_write(3)

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