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 <a href="http://docs.freeswitch.org/group__mb1.html">http://docs.freeswitch.org/group__mb1.html</a>.<div>
<br></div><div>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.<br>
<div><br></div><div>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.</div><div><br></div><div>
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.</div>
<div><br></div><div>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.</div>
<div><br></div><div>-Steve</div><div><br></div><div><br></div><div>
<br><br><div class="gmail_quote">On 22 January 2013 11:19, Peter Steinbach <span dir="ltr"><<a href="mailto:lists@telefaks.de" target="_blank">lists@telefaks.de</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
<div>Hello Anthony,<br>
<br>
although it may be incomplete, it may be useful for us. Can you
give us some basic explanation, how this works? <br>
I can see in the code that there is a stress command with
read|write|stop parameter. <br>
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.<br>
<br>
I would be happy to test this and report my configuration,
explanations and examples in the wiki. <br>
<br>
Best regards<span><font color="#888888"><br>
Peter</font></span><div><div><br>
<br>
<br>
On 01/22/13 00:30, Anthony Minessale wrote:<br>
</div></div></div><div><div>
<blockquote type="cite">
<div dir="ltr">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.
<div>
<br>
</div>
</div>
<div class="gmail_extra"><br>
<br>
<div class="gmail_quote">On Mon, Jan 21, 2013 at 4:56 PM, Peter
Steinbach <span dir="ltr"><<a href="mailto:lists@telefaks.de" target="_blank">lists@telefaks.de</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I am also
wondering, what this module does in detail.<br>
<br>
Regarding the source code, I can see that FFT's are made in
order to to<br>
get some sort of frequency profile.<br>
But the code and remarks do not give me a clue how this
module actually<br>
works.<br>
<br>
Best regards Peter<br>
<br>
<br>
<br>
On 05/26/12 15:05, BF wrote:<br>
> Hello,<br>
><br>
> 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.<br>
><br>
> Anyone?<br>
><br>
> Thank you.<br>
><br>
> Eric<br>
>
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<br clear="all">
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<br>
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<br>
<pre cols="72">--
With kind regards
Peter Steinbach
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</pre>
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