[Freeswitch-users] mod_stress

[Peter Steinbach]

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

Telefaks Services GmbH
mailto:lists (att) telefaks.de
Internet: www.telefaks.de

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