On Wed, 2008-12-10 at 12:37 -0800, Chris Stankevitz wrote:
> usrp1_source_base.cc has this chunk of code that reads from
> usrp_standard_rx:
>
> //----------
> while (output_index < noutput_items)
> {
> int nbytes = ninput_bytes_reqd_for_noutput_items (
> noutput_items - output_index);
>
> nbytes = std::min (nbytes, BUFSIZE);
>
> int result_nbytes = d_usrp->read (buf, nbytes, &overrun);
> //----------
>
> Question: What guarantees that nbytes is a multiple of 512?
In the usrp1_source_base constructor, a call is made to
set_output_multiple(n), which tells the scheduler to only call the work
function to produce a multiple of n samples:
http://gnuradio.org/trac/browser/gnuradio/trunk/gr-usrp/src/usrp1_source_base.cc#L63
-Johnathan
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