[Freeswitch-users] mod_stress

Wed Jan 23 23:22:43 MSK 2013

It requires transcoding so it will increase CPU usage. That'll only
increase CPU usage if you're not already transcoding. It also calculates
the FFT, which from memory is a relatively expensive operation... there
will be a noticable impact of using it.

As for G729 licenses, it'll use an extra license for a channel that's not
being transcoded/recorded/eavesdropped etc - but won't if you're already
doing one of those on it.

-Steve

On 23 January 2013 17:47, Raimund Sacherer
<raimund.sacherer at logitravel.com>wrote:

> 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
>
> ------------------------------
> *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:
>
>>  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:
>>
>> 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:
>>
>>> 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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>>> --
>>> With kind regards
>>> Peter Steinbach
>>>
>>> Telefaks Services GmbH
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>>> Internet: www.telefaks.de
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>>
>>
>>
>>  --
>> Anthony Minessale II
>>
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>> With kind regards
>> Peter Steinbach
>>
>> Telefaks Services GmbHmailto:lists <lists> (att) telefaks.de
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>
>
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> --
> With kind regards
> Peter Steinbach
>
> Telefaks Services GmbHmailto:lists <lists> (att) telefaks.de
> Internet: www.telefaks.de
>
>
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>
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