Hi Robert,

It sounds like you're looking for the `buf_num` argument to
rtlsdr_read_async.  This is in rtl-sdr.h:
https://git.osmocom.org/rtl-sdr/tree/include/rtl-sdr.h#n362 .

I run into problems like that all the time, myself.  Due to my issues,
I've found it hard to collaborate on this project myself.  See mailing
list archive of contributions that were minimally addressed.  I try to
focus around communication that's more reliable than radio now, like
memo.cash .

But I'm still passionate about helping rtl-sdr grow.

Karl

On 8/15/19, Hudspeth, Robert Lee <hudspero@oregonstate.edu> wrote:
> Hello! I am an undergraduate student at Oregon State University working
> with RTL-SDR dongles for an academic project under supervision from
> Benjamin Brewster, and I had a dev question.
>
> I'm trying to run utilities that capture 978
> <https://github.com/mutability/dump978> & 1090Mhz
> <https://github.com/mutability/dump1090> traffic simultaneously, but I
> can't seem to stop rtl_sdr from allocating too many zero-copy buffers and
> preventing both programs from running simultaneously (I'd like to cut down
> from 15). I've been through librtlsdr.c and rtl_adsb.c with the hope of
> manually changing some variable that will let me accomplish this to no
> avail.
>
> Is there some line I might have overlooked, or some additional parameter(s)
> I might need to enter?
>