newbie soundmodem question about mic vs line input

newbie soundmodem question about mic vs line input

[James Washer]

I've got soundmodem working using the mic jack, but I'd rather use the line jack. When I try, I get nothing.. hence, the following questions.


1) Under linux, are the mic and line inputs mixed, or do they have seperate devices to open?

2) I can play with the mic/line/speaker/etc gains using aumix.. Does this have any effect on soundmodem, or does it set the gain using ioctls, etc.

3) The mic jack appears to be mono, where as the line jack appears to be stereo. Does soundmodem have any options to listen to the two channels seperately? i.e. I'd like to do APRS on one channel, and packet on another, but I fear that /dev/dsp is a mix. Is this correct? 

thanks

 - jim

Re: newbie soundmodem question about mic vs line input

[Jeroen Vreeken]

On 2004.02.13 19:02:03 +0100 James Washer wrote:
> 
> I've got soundmodem working using the mic jack, but I'd rather use the
> line jack. When I try, I get nothing.. hence, the following questions.
> 
> 
> 1) Under linux, are the mic and line inputs mixed, or do they have
> seperate devices to open?

Normally you can select one of the inputs and get only audio from that
input.
Open an app such as gmix and make sure the box for line in is checked.
 
> 2) I can play with the mic/line/speaker/etc gains using aumix.. Does this
> have any effect on soundmodem, or does it set the gain using ioctls, etc.

With this you control the mixer of your soundcard (and can probably select
the input source as mentioned above) and as such you have to set it in a
way that the levels that soundmodem gets are sane.

> 3) The mic jack appears to be mono, where as the line jack appears to be
> stereo. Does soundmodem have any options to listen to the two channels
> seperately? i.e. I'd like to do APRS on one channel, and packet on
> another, but I fear that /dev/dsp is a mix. Is this correct? 

In theory on a stereo soundcard you get two seperate channels. So it should
be possible, but I don't think the soundmodem code does that now...
But they will both have the same bitrate so that would limit your
possibilities a bit.

Jeroen

Soundmodem Logging

[Dave Stubbs]

Hello all,

I'm using userspace soundmodem, and it works really great.  However, I 
have a question about the soundmodem logging setup.

I have the following in my script that starts up soundmodem:

soundmodem -sM -v 9

According to my reading, the -s switch should switch logging to the 
syslog, and the -v 9 switch should enable massive amounts of logging.

However, despite this, the syslog only gets one entry showing syslog 
startup, while the console gets the massive spew of log items.

Is there any way to redirect all these messages to the syslog instead, 
where I believe my command line setup told them to go?

Thanks,

Dave
VA3BHF

Re: Soundmodem Logging

[Niall Parker]

Dave Stubbs wrote:
> Hello all,
> 
> I'm using userspace soundmodem, and it works really great.  However, I 
> have a question about the soundmodem logging setup.
> 
> I have the following in my script that starts up soundmodem:
> 
> soundmodem -sM -v 9
> 
> According to my reading, the -s switch should switch logging to the 
> syslog, and the -v 9 switch should enable massive amounts of logging.
> 
> However, despite this, the syslog only gets one entry showing syslog 
> startup, while the console gets the massive spew of log items.
> 
> Is there any way to redirect all these messages to the syslog instead, 
> where I believe my command line setup told them to go?

Just a guess, but check your syslog.conf file to see what it is doing 
with the messages by facility and loglevel ... it may be receiving them 
OK and then redirecting them to the console.

				... Niall (VE7HEX)

Re: Soundmodem Logging

[Dave Stubbs]

Niall Parker wrote:
> Dave Stubbs wrote:
> 
>> Hello all,
>>
>> I'm using userspace soundmodem, and it works really great.  However, I 
>> have a question about the soundmodem logging setup.
>>
>> I have the following in my script that starts up soundmodem:
>>
>> soundmodem -sM -v 9
>>
>> According to my reading, the -s switch should switch logging to the 
>> syslog, and the -v 9 switch should enable massive amounts of logging.
>>
>> However, despite this, the syslog only gets one entry showing syslog 
>> startup, while the console gets the massive spew of log items.
>>
>> Is there any way to redirect all these messages to the syslog instead, 
>> where I believe my command line setup told them to go?
> 
> 
> Just a guess, but check your syslog.conf file to see what it is doing 
> with the messages by facility and loglevel ... it may be receiving them 
> OK and then redirecting them to the console.
> 
Got that one covered.  I'm redirecting all syslog messages, no matter 
how insignificant or from what facility, to a central logging server 
which puts them in a MySQL database.  From other programs running on the 
same hambox as soundmodem, I'm getting so much information it's crazy, 
so I don't think syslog is the problem in this case.  Is anyone else 
using syslog to track soundmodem packets?

One other thought - maybe the trace that's coming up on my console is 
not from the soundmodem software - maybe it's from kernel AX.25 code or 
something?  Is there a way to redirect *that* to the syslog?

Dave...

Re: Soundmodem Logging

[Dave Stubbs]

Dave Stubbs wrote:
> Niall Parker wrote:
> 
>> Dave Stubbs wrote:
>>
>>> Hello all,
>>>
>>> I'm using userspace soundmodem, and it works really great.  However, 
>>> I have a question about the soundmodem logging setup.
>>>
>>> I have the following in my script that starts up soundmodem:
>>>
>>> soundmodem -sM -v 9
>>>
>>> According to my reading, the -s switch should switch logging to the 
>>> syslog, and the -v 9 switch should enable massive amounts of logging.
>>>
>>> However, despite this, the syslog only gets one entry showing syslog 
>>> startup, while the console gets the massive spew of log items.
>>>
>>> Is there any way to redirect all these messages to the syslog 
>>> instead, where I believe my command line setup told them to go?
>>
>>
>>
>> Just a guess, but check your syslog.conf file to see what it is doing 
>> with the messages by facility and loglevel ... it may be receiving 
>> them OK and then redirecting them to the console.
>>
> Got that one covered.  I'm redirecting all syslog messages, no matter 
> how insignificant or from what facility, to a central logging server 
> which puts them in a MySQL database.  From other programs running on the 
> same hambox as soundmodem, I'm getting so much information it's crazy, 
> so I don't think syslog is the problem in this case.  Is anyone else 
> using syslog to track soundmodem packets?
> 
> One other thought - maybe the trace that's coming up on my console is 
> not from the soundmodem software - maybe it's from kernel AX.25 code or 
> something?  Is there a way to redirect *that* to the syslog?
> 

Well,

I was able to confirm that.  I set my soundmodem to -v 0 and rebooted. 
The piddly little syslog trail vanished, but I still got the massive 
spew of all packets on the console.  I put the -v 9 back into soundmodem 
startup and the syslog messages started again (such as they are) and the 
console spew remains.

So, a new question - does anyone know where the console messages (they 
start with "Tx:") come from?  Can they be redirected to syslog or sent 
there instead of the console?

Thankyou,

Dave...
VA3BHF

Re: Soundmodem Logging

[Tomi Manninen]

On Sun, 2005-03-06 at 15:12, Dave Stubbs wrote:

> So, a new question - does anyone know where the console messages (they 
> start with "Tx:") come from?  Can they be redirected to syslog or sent 
> there instead of the console?

It's soundmodem in soundcard/kisspkt.c:

 line 306:	printf("Rx: %s\n", buf);

and

 line 407:	printf("Tx: %s\n", buf);

So it's hardcoded to go to stdout, you need to modify the source to 
make it go elsewhere.

-- 
Tomi Manninen / OH2BNS / KP20JF74

Re: Soundmodem Logging

[Dave Stubbs]

Tomi Manninen wrote:

>On Sun, 2005-03-06 at 15:12, Dave Stubbs wrote:
>
>  
>
>>So, a new question - does anyone know where the console messages (they 
>>start with "Tx:") come from?  Can they be redirected to syslog or sent 
>>there instead of the console?
>>    
>>
>
>It's soundmodem in soundcard/kisspkt.c:
>
> line 306:	printf("Rx: %s\n", buf);
>
>and
>
> line 407:	printf("Tx: %s\n", buf);
>
>So it's hardcoded to go to stdout, you need to modify the source to 
>make it go elsewhere.
>
>  
>
Indeed.

Well, there's the culprit.  Actually, what I would really like to see is 
the same output from *listen -a* showing up in the syslog.  Is there a 
way to do something like "listen -a > /dev/log" or something like that?  
It seems that I can't redirect stdout to a FIFO, or this would work.  Is 
there a tool that would do it then?

Thanks for the help,

Dave

Re: Soundmodem Logging

[Gérard / F6FGZ]

Dave Stubbs a écrit :

> Tomi Manninen wrote:
>
> >On Sun, 2005-03-06 at 15:12, Dave Stubbs wrote:
> >
> >
> >
> >>So, a new question - does anyone know where the console messages (they
> >>start with "Tx:") come from?  Can they be redirected to syslog or sent
> >>there instead of the console?
> >>
> >>
> >
> >It's soundmodem in soundcard/kisspkt.c:
> >
> > line 306:     printf("Rx: %s\n", buf);
> >
> >and
> >
> > line 407:     printf("Tx: %s\n", buf);
> >
> >So it's hardcoded to go to stdout, you need to modify the source to
> >make it go elsewhere.
> >
> >
> >
> Indeed.
>
> Well, there's the culprit.  Actually, what I would really like to see is
> the same output from *listen -a* showing up in the syslog.  Is there a
> way to do something like "listen -a > /dev/log" or something like that?
> It seems that I can't redirect stdout to a FIFO, or this would work.  Is
> there a tool that would do it then?
>
> Thanks for the help,
>
> Dave
> -

I used this function for showing up in the syslog, it may be modified for your
use:

#include <syslog.h>

#define LOG_LEVEL LOG_INFO

void log(int loglevel, const char *fmt, ...)
{
        va_list args;
        int pri;
        static int opened = 0;

        if (!opened) {
                openlog("your_identifier", LOG_CONS, LOG_LOCAL6);
                opened = 1;
        }
        pri = loglevel;
        va_start(args, fmt);
        vsprintf(buf, fmt, args);
        syslog(pri, buf);
        va_end(args);
}

log(LOG_LEVEL, "%d %s%d.%06d %ld\n", dcft.tv_sec, sign? "-": "+", delta.tv_sec,
delta.tv_usec, tx.freq);

--
73 Gérard F6FGZ



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Re: newbie soundmodem question about mic vs line input

[Tomi Manninen]

Hi,

> 1) Under linux, are the mic and line inputs mixed, or do they 
> have seperate devices to open?

It's one device, with the input (recording) device selected by 
ioctls.

> 2) I can play with the mic/line/speaker/etc gains using aumix.. 
> Does this have any effect on soundmodem, or does it set the gain 
> using ioctls, etc.

Soundmodem does not touch the sound card mixer settings nor does 
it change the input selection. These must be set with a regular
mixer application. I use gmix.

> 3) The mic jack appears to be mono, where as the line jack appears 
> to be stereo. Does soundmodem have any options to listen to the two 
> channels seperately? i.e. I'd like to do APRS on one channel, 
> and packet on another, but I fear that /dev/dsp is a mix. Is this 
> correct? 

Whether recording is stereo or mono (usually mono == left channel)
is again selected with ioctls. Soundmodem sets the device for
mono input and output.

-- 
Tomi Manninen / OH2BNS / KP20ME04