<div dir="ltr"><div class="gmail_quote">On Mon, May 2, 2011 at 3:23 PM, Danny Nicholas <span dir="ltr"><<a href="mailto:danny@debsinc.com">danny@debsinc.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
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<p class="MsoNormal"><b><font size="2" face="Tahoma"><span style="font-size:10.0pt;font-family:Tahoma;font-weight:bold">From:</span></font></b><font size="2" face="Tahoma"><span style="font-size:10.0pt;font-family:Tahoma"> <a href="mailto:asterisk-users-bounces@lists.digium.com" target="_blank">asterisk-users-bounces@lists.digium.com</a>
[mailto:<a href="mailto:asterisk-users-bounces@lists.digium.com" target="_blank">asterisk-users-bounces@lists.digium.com</a>]
<b><span style="font-weight:bold">On Behalf Of </span></b>A E [Gmail]<br>
<b><span style="font-weight:bold">Sent:</span></b> Monday, May 02, 2011 1:23 PM<br>
<b><span style="font-weight:bold">To:</span></b> Asterisk
Users Mailing List - Non-Commercial Discussion<br>
<b><span style="font-weight:bold">Subject:</span></b> Re: [asterisk-users]
Retrieving/Streaming audio/video files from DBusing over AGI</span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12.0pt">Just realised that
this can better be described another way:</span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12.0pt">What we're
essentially trying to do is be able to do any one of these</span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12.0pt">a) stream an
audio/video file stored in the DB via AGI into the current channel so that it
plays on the phone</span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12.0pt">OR </span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12.0pt">b) Do something
like what Realtime Voicemail does, where it gets the file from the DB, saves as
a temp file in the user mailbox directory and then plays it to the caller but
this needs to happen through AGI, something along the lines of readsql (a la
func_odbc) inside of AGI</span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12.0pt">OR </span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12.0pt">c) Anything else
that's better than a) and b) above that someone can suggest. </span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12.0pt">P.S> I do know
about the AGI AddOn of PUT SOUNDFILE and GET SOUNDFILE which seems to be the
only solution we can think of right now, other than of course having the DB
machine exporting the SAN volume as an NFS share for the Asterisk server to
mount, but that sounds like it'll be bad for performance?</span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12.0pt">Thanks again</span></font></p>
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<p class="MsoNormal"><font size="3" color="#000099" face="Arial"><span style="font-size:12.0pt;font-family:Arial;color:#000099">No takers? :(</span></font></p>
<p class="MsoNormal"><b><i><font size="2" color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy;font-weight:bold;font-style:italic">[Danny Nicholas] </span></font></i></b></p>
<p class="MsoNormal"><b><i><font size="2" color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy;font-weight:bold;font-style:italic">In your original scenario you
were opening yourself to probable latency issues – I would personally pursue
something along the line of option B where I put the DB data into a temp file
and ran a daemon to clear the temp files hourly or daily as needed. If
the delivery worked well across most LAN’s/WAN’s, some gung-ho developer would
have hosed another part of Asterisk trying to get that “bell and whistle” into
the trunk.</span></font></i></b></p>
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<p class="MsoNormal"><font size="3" color="#000099" face="sans-serif"><span style="font-size:12.0pt;font-family:sans-serif;color:#000099">Thanks Danny. I'm
not so sure, that latency will be that much of an issue being on the same
physical GbE switch as the DB server without any other traffic on it but sure,
I know that a long time ago when I implemented Realtime Voicemail, it worked
pretty good, so I'll be happy with b). I guess we do need to use that AGI
AddOn of PUT SOUNDFILE after all. </span></font></p>
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<p class="MsoNormal"><font size="3" color="#000099" face="sans-serif"><span style="font-size:12.0pt;font-family:sans-serif;color:#000099">Would be good if
more people can throw a few ideas around to see if there's a smarter way to do
it. Another idea we had was to dumb these files (since they'll be very small in
duration and thus in size) into a directory, run a web-server and have AGI
retrieve them using curl and just use "Background" to play it.
Thoughts?</span></font><font face="sans-serif"><span style="font-family:sans-serif"></span></font></p>
</div><p class="MsoNormal"><b><i><font size="2" color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy;font-weight:bold;font-style:italic">[Danny Nicholas] </span></font></i></b></p>
<p class="MsoNormal"><b><i><font size="2" color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy;font-weight:bold;font-style:italic">IMO, adding curl to the mix is just going to introduce
another possible point of failure. If they are that small, why not do a
daemonized delivery system?</span></font></i></b><font size="2" color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy"></span></font></p>
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</blockquote></div><br><div><font class="Apple-style-span" face="'trebuchet ms', sans-serif">By daemonized delivery system, I'm assuming you mean have some background process running to transport these files from the DB to the asterisk server and play them?</font></div>
<div><font class="Apple-style-span" face="'trebuchet ms', sans-serif"><br></font></div><div><font class="Apple-style-span" face="'trebuchet ms', sans-serif">There are two issues with that</font></div><div>
<font class="Apple-style-span" face="'trebuchet ms', sans-serif">a) Sounds like too much I/O esp. with small files getting written and deleted. </font></div><div><font class="Apple-style-span" face="'trebuchet ms', sans-serif"><br>
</font></div><div><font class="Apple-style-span" face="'trebuchet ms', sans-serif">b) What if there are several asterisk servers and the call can come into any of the servers. Do we invoke the daemon at will, run a SQL query, extract it from the DB, and transfer it to the asterisk server which initiated the request and then play it? Sounds like it might add a bit more latency than streaming it right inside the connection opened by AGI itself, although we could not store these files in the DB and just have them sit on a dedicated SAN volume and whenver a request comes in, we send it to the requesting asterisk server. </font></div>
<div><font class="Apple-style-span" face="'trebuchet ms', sans-serif"><br></font></div><div><font class="Apple-style-span" face="'trebuchet ms', sans-serif">That's all of course if I understood you correctly.</font></div>
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