Re: [iaxmodem-users] IAXModem 1.2.0 with latest spandsp-0.0.6pre17 doesn't compile

[Fabio P. (naif) <li...@in...>]

On 24/11/10 05.29, Lee Howard wrote:
> Fabio Pietrosanti (naif) wrote:
>> I am trying spandsp 0.0.6pre17 released 9 months ago but i verified
>> that it does not compile with iaxmodem 1.2.0 .
>
> I have not yet released a version of iaxmodem with the newest spandsp
> snapshots because of certain problems in the DSP modems.  So there's a
> reason why you'll want to stick with iaxmodem the way that it is. 
> When the problems in spandsp are worked-out then you'll see
> iaxmodem-1.3.0 released.
Which are the specific issues?  Does the SpanDSP developer is aware of it?
Are mainly FAX related?

>
>> Does some is able to have a look at it to compatibilize IAXModem with
>> spandsp 0.0.6-pre17 code?
>
> I've got an iaxmodem in development that will build with the latest
> spandsp snapshots, but I don't intend on cutting 1.3.0 with it this
> way, for reasons I've already mentioned.
>
> Furthermore, I suspect you're wanting this for data-modem support of
> some kind, and to the best of my knowledge spandsp does not yet
> support data-modem anyway.
Quickly looking at spandsp code and webpage it seems that it's
supporting most low speed modem carrier:
http://www.soft-switch.org/spandsp-modules.html

    * Low speed asynchronous FSK modems
      <http://www.soft-switch.org/spandsp-doc/fsk_page.html> (V.21,
      V.23, Bell 103, Bell 202, etc.)


    * V.22bis modem
      <http://www.soft-switch.org/spandsp-doc/v22bis_page.html>

./src/v22bis_rx.c
./src/v22bis_tx.c
./src/fsk.c:        "Bell103 ch 1",
./src/fsk.c:        "Bell103 ch 2",
./src/fsk.c:        "Bell202",

I tried to use it but it never worked with IAXmodem.

My trough was:

In order to support low speed modem carrier the modifications required
are on IAXModem side or on SpanDSP side?

Maybe it's just a matter of handling into IAXModem e passing it to SpanDSP?

Probably i am oversimplifying, but it seems that the code to handle this
is already inside SpandSP.

>> New spandsp 0.0.6 have great improvements and i really hope that will
>> works for modem connections.
>
> Of what great improvements do you speak?  Why do you have any hope
> that it will support data modems?
I've made some diffing of sources and noticed that there was some major
refactoring.

I noticed that in SPANDSP 0.0.6 the amount of code of V22bis and FSK
related modem is much more:
36K    spandsp-0.0.6/src/v22bis_rx.c
28K    spandsp-0.0.5/src/v22bis_rx.c
20K    spandsp-0.0.6/src/fsk.c
16K    spandsp-0.0.5/src/fsk.c

so there are major modifications that i think are improvements respect
to FSK and V22bis .

What do you think, would it possible to try to use spandsp 0.0.6 AND /
OR trying to evaluate which modifications are required to support low
speed modem carriers?

Fabio