[Freeswitch-users] mod_stress

Wed Jan 23 20:47:33 MSK 2013

Hi Peter, 

can you also make some statistics available on how much this module, if activated, adds to the ressource usage? If you have a busy callcenter, would this make a noticable impact on CPU usage? 

Also, would this use an additional G729 codec for calls using this codec? 

thanks, 
best regards 
Raimund 

----- Original Message -----

From: "Peter Steinbach" <lists at telefaks.de> 
To: "FreeSWITCH Users Help" <freeswitch-users at lists.freeswitch.org> 
Sent: Miércoles, 23 de Enero 2013 0:34:41 
Subject: Re: [Freeswitch-users] mod_stress 

Thanks Steven, 

I got it working and reported my howto and findings in the wiki: 
http://wiki.freeswitch.org/wiki/Mod_stress 

I found it to be a nice application, but as you explained, there are some false positives. 

Best regards 
Peter 

On 01/22/13 12:39, Steven Ayre wrote: 

Media bugs are used to hook into the call and provide decoded audio to the module. That requires transcoding, naturally. See stress_callback which is called for each audio frame plus some init/cleanup hooks, and read up on the API at http://docs.freeswitch.org/group__mb1.html . 

I suspect read vs write would correspond to the speaking/listening directions of the channel. Read from caller, write to caller? The names come from the media bug API. The read/write options will add the corresponding media bug, stop will remove them. 

SWITCH_ADD_APP tells you it's a dialplan application - it's started from dialplan, although you can also trigger dialplan apps on a channel via ESL using uuid_broadcast. 

The FFT algorithm is used to extract the frequencies present in the sample (the power spectrum). The algorithm then tries to detect stressed based on that. Looks like the algorithm at least in part attempts to look for tremor in the voice. More tremor indicates more stress. Over a threshold it raises an event. 

Bear in mind that as it's pattern recognition (and little tested at that) you'll get a lot of false positives and false negatives. It's also looking for something in the voice that may or may not be there - some people might be able to speak with an unstressed voice when they're actually quite stressed. 

-Steve 

On 22 January 2013 11:19, Peter Steinbach < lists at telefaks.de > wrote: 

<blockquote>

Hello Anthony, 

although it may be incomplete, it may be useful for us. Can you give us some basic explanation, how this works? 
I can see in the code that there is a stress command with read|write|stop parameter. 
Is this to be issued via event socket or is it a dialplan application? I suspect that "read" somehow starts the detection and "stop" somehow stops the detection. For "write" I currently have no idea. 

I would be happy to test this and report my configuration, explanations and examples in the wiki. 

Best regards 
Peter 

On 01/22/13 00:30, Anthony Minessale wrote: 

<blockquote>

That module is incomplete we made it several years ago to test some code that was supposed to pick up on stress in your voice in a media bug so we could fire events and whisper "lie" to the caller as he talked to the guy. 

On Mon, Jan 21, 2013 at 4:56 PM, Peter Steinbach < lists at telefaks.de > wrote: 

<blockquote>
I am also wondering, what this module does in detail. 

Regarding the source code, I can see that FFT's are made in order to to 
get some sort of frequency profile. 
But the code and remarks do not give me a clue how this module actually 
works. 

Best regards Peter 

On 05/26/12 15:05, BF wrote: 
> Hello, 
> 
> I'd like to know what the "stress write" from mod_stress module does. I have hard time finding documentation or an example about mod_stress module. 
> 
> Anyone? 
> 
> Thank you. 
> 
> Eric 
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</blockquote>

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