Jim Lux skrev 2011-09-19 18:48:
On 9/17/2011 12:18 PM, Ben / SM0KBW wrote:
Jim Lux skrev 2011-09-13 17:39:
On 9/12/2011 9:38 PM, Sal wrote:
wrote in message
...



Wait a minute. What this guy is selling is a streaming audio app,
not a
"shortwave radio" program.

Correct. The screen display is a "fake" radio. Tsk, tsk!



Oddly, I have been looking for a simple streaming audio app (to bring
back audio from remote receivers via 802.11 for a antenna measurement
project)... This one is clearly not it, but what else is out there.

I have used IHU, http://ihu.sourceforge.net/ for voip streaming. It's
for Linux and that maybe disqualfies that program?

being Linux doesn't disqualify it, but having no support for other OSes
sort of does..

At least it has a command line interface (useful for the remote end,
which is a small Linux box) (bearing in mind the author's warning:

Those options are useful for quick launch (at least for me ,
but I don't think it's a good idea to use them (they might be buggy),
in the future I may use standard GNU getopt, but for the moment
please use the graphic interface instead.


And it has a variety of flavors. And it might be possible to compile it
to run under OS-X or windows (not in emulation or VM, but using a useful
library)

The real gripe I have is that the data format isn't described anywhere
(at least not that google can find). reading through the source code
finds stuff about headers, stream sync, etc. but there's no obvious
description of what the UDP/TCP packets look like. In fact, there's no
comments in the source code, for the most part.

So if you DID want to write your own endpoint, it would be mighty tough.

I'm not sure what you mean with data format, but I assume you are
talking about the audio stream. IHU is just a simple interface to
Speex, http://www.speex.org/, and that is a free audio compressing
codec, at least free in the sense of BSD License.

The documentation for Speex is rather comprehensive, and it covers the
RTP format and the API.

73
Ben / SM0KBW