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Re: [Discuss-gnuradio] floats over UDP into GRC?
From: |
Mark Cetilia |
Subject: |
Re: [Discuss-gnuradio] floats over UDP into GRC? |
Date: |
Tue, 13 Sep 2011 20:24:23 -0400 |
Thanks so much Marcus, this makes perfect sense…
Cheers,
Mark
--
mark.cetilia.org | mem1.com | reduxproject.com
On Sep 13, 2011, at 7:45 PM, Marcus D. Leech wrote:
>> I'm producing the stream in C++ (using openFrameworks) and sending the data
>> as char arrays,
>> and have confirmed that this is indeed all that is being sent (e.g. "1.25")…
> So, you're sending them in ASCII? As ASCII strings?
>
> GRC/gnuradio has no method for dealing with that. The UDP block assumes
> native machine-binary format for data coming in
> over UDP. Doing it in ASCII (Or Unicode, or whatever) strings will be
> hugely inefficient, both in terms of bandwidth required--
> it takes many more bytes to represent a floating-point number in ASCII, than
> in the native binary format, and converting from
> strings back into the native binary format is also quite expensive. Since
> UDP is entirely binary transparent, there's no reason
> to send them as ascii strings. The only thing you have to watch out for is
> if the raw floating-point format between your two
> machines is different. But between x86-family machines, it's all the same.
>
>
>
> --
> Marcus Leech
> Principal Investigator
> Shirleys Bay Radio Astronomy Consortium
> http://www.sbrac.org
>
>
- [Discuss-gnuradio] Transmitting additional data from N210 to the PC, Eral Tuerkyilmaz, 2011/09/05
- Re: [Discuss-gnuradio] Transmitting additional data from N210 to the PC, Josh Blum, 2011/09/05
- Re: [Discuss-gnuradio] Transmitting additional data from N210 to the PC, Eral Tuerkyilmaz, 2011/09/13
- [Discuss-gnuradio] floats over UDP into GRC?, Mark Cetilia, 2011/09/13
- Re: [Discuss-gnuradio] floats over UDP into GRC?, Marcus D. Leech, 2011/09/13
- Re: [Discuss-gnuradio] floats over UDP into GRC?, Andrew Rich, 2011/09/13
- Re: [Discuss-gnuradio] floats over UDP into GRC?, Mark Cetilia, 2011/09/13
- Message not available
- Re: [Discuss-gnuradio] floats over UDP into GRC?, Marcus D. Leech, 2011/09/13
- Re: [Discuss-gnuradio] floats over UDP into GRC?,
Mark Cetilia <=
- Re: [Discuss-gnuradio] floats over UDP into GRC?, Mark Cetilia, 2011/09/18
- Re: [Discuss-gnuradio] Transmitting additional data from N210 to the PC, Josh Blum, 2011/09/13
- Re: [Discuss-gnuradio] Transmitting additional data from N210 to the PC, Eral Tuerkyilmaz, 2011/09/16