Re: [RDD] More questions

[Fred Gleason <fredg@xxxxxxxxxxxxxxxxxx>]

On Thursday 29 July 2004 09:13, John Handelaar wrote:

> Oops, no I won't.  Seems not to have any public refs save
> a Usenet post or 3.

Here's a copy of Dan's original announcement (on rivendell-prog):

*** snip snip ***
Well, I have finally gone and done it.
My 'Airchain' project finally has a CVS repository (Thanks Fred!). 

The first module uploaded (and it is very much a work in progress) is a stereo 
generator and RDS encoder done in software. 

At the moment it takes its input from jack and outputs 16 bit samples to 
stdout (from within the process callback - needs fixing) at 4* the input 
sample rate.

There is No GUI at present and changing the RDS messages means a recompile, I 
know, I know, Working on it!

If you want to play with this thing, you will need a copy of fftw3 (compiled 
for float type data), as we use this to run the inverse FFT to generate the 
RDS impulse pair http://www.fftw.org. The other (obviously required component 
is jackd. 

The other major work that needs doing is in the overshoot limiter which is 
just far too expensive (CPU time) at the moment. 

Note about the input: 
This assumes that the pre em has been done elsewhere (like say in my louderbox 
code which I will check in next). Also while at present we are taking input 
from jack, it is probable that I am going to modify things to take input from 
the same soundcard used for the output so as to reduce the synchronisation 
headaches and make the upsampling cheaper.

Regards, Dan.
*** snip snip ***

The code is available via CVS, at:

	:pserver:anonymoous@xxxxxxxxxxxxxxxxxxxxxxxxxxx:/home/cvs

Cheers!


|-------------------------------------------------------------------------|
| Frederick F. Gleason, Jr. | Director of Broadcast Software Development  |
|                           |             Salem Radio Labs                |
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|       All great ideas are controversial, or have been at one time.      |
|                                             -- Anonymous                |
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