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<div class=Section1>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Thanks very much Anthony.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>It is quite clear now but I wonder if anyone could suggest me
the proper way to go about this problem<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>My device has a buffer of 64 bytes equal to 8 ms of PCMA/PCMU so
in the write_frame I need to write 64 bytes of PCMA to the device every 8 ms.
Attempt to more at a time will cause frames lost. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>However, codecs in freeswitch only support ptime of multiple of
10 (10, 20, 30, 40…) so the work around that I go for is to take ptime =
40 ms since 40 can device by 8.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>It means, every 40 ms the write_frame event will be called
right? And the frame->data will have 320 bytes so I try to write to the
device 5 times, each time 64 bytes. Still trying different ways for this
problem as I haven’t achieved a good timing yet. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Anybody has added support for ptime of multiple of 2, 4 or 8 for
G711 before ?<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Regards<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Alex To<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
freeswitch-dev-bounces@lists.freeswitch.org
[mailto:freeswitch-dev-bounces@lists.freeswitch.org] <b>On Behalf Of </b>Anthony
Minessale<br>
<b>Sent:</b> Tuesday, November 10, 2009 2:00 AM<br>
<b>To:</b> freeswitch-dev@lists.freeswitch.org<br>
<b>Subject:</b> Re: [Freeswitch-dev] Questions about read_frame and write_frame
events<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'>yes you must return a frame
marked SFF_CNG rather than a NULL frame.<br>
<br>
The TFLAG flags are all arbitrary, you can get rid of all of them if you wish
they are just an example of how those modules communicate
internally. Sometimes they were used for the host technology to
have a way to mark the channel so the call should die but you may get the same
effect by just hanging up the channel since the core now does a lot of this and
may never let your read func even be called.<br>
<br>
<o:p></o:p></p>
<div>
<p class=MsoNormal>On Mon, Nov 9, 2009 at 3:54 AM, Alex To <<a
href="mailto:tonhudung@gmail.com">tonhudung@gmail.com</a>> wrote:<o:p></o:p></p>
<div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'>Thank you very much Mathieu</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'>So if TFLAG_IO is not set, read_frame
will return immediately and *frame is NULL ? Is it a normal behavior if the
call is terminated when a NULL frame is returned ? </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'>Coz when I return a NULL frame, the call
is terminated. So now my understanding is that if my endpoint buffer is empty,
I need to return a silence frame to the other end, right?</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'>Thank again Mathieu for your quick
reply, that helps a lot </span><span style='font-size:11.0pt;font-family:Wingdings;
color:#1F497D'>J</span><span style='font-size:11.0pt;color:#1F497D'>.</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'>Regards</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'>Alex To</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<div>
<div style='border:none;border-top:solid windowtext 1.0pt;padding:3.0pt 0in 0in 0in;
border-color:-moz-use-text-color -moz-use-text-color'>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-size:10.0pt'>From:</span></b><span style='font-size:10.0pt'> <a
href="mailto:freeswitch-dev-bounces@lists.freeswitch.org" target="_blank">freeswitch-dev-bounces@lists.freeswitch.org</a>
[mailto:<a href="mailto:freeswitch-dev-bounces@lists.freeswitch.org"
target="_blank">freeswitch-dev-bounces@lists.freeswitch.org</a>] <b>On Behalf
Of </b>Mathieu Rene<br>
<b>Sent:</b> Monday, November 09, 2009 2:54 AM<br>
<b>To:</b> <a href="mailto:freeswitch-dev@lists.freeswitch.org" target="_blank">freeswitch-dev@lists.freeswitch.org</a><br>
<b>Subject:</b> Re: [Freeswitch-dev] Questions about read_frame and write_frame
events</span><o:p></o:p></p>
</div>
</div>
<div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Hi,<o:p></o:p></p>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>See
answers inline.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<div>
<div>
<div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:9.0pt;color:black'>Mathieu Rene</span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:9.0pt;color:black'>Avant-Garde Solutions Inc</span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:9.0pt;color:black'>Office: + 1 (514) 664-1044 x100</span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:9.0pt;color:black'>Cell: +1 (514) 664-1044 x200</span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:9.0pt;color:black'><a href="mailto:mrene@avgs.ca"
target="_blank">mrene@avgs.ca</a></span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:9.0pt;color:black'> </span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:9.0pt;color:black'> </span><o:p></o:p></p>
</div>
</div>
</div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
</div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>On
8-Nov-09, at 4:21 AM, Alex To wrote:<o:p></o:p></p>
</div>
<p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'><o:p> </o:p></p>
<div>
<div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:black'>Hi,</span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:black'> </span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:black'>I am getting stuck on read_frame and
write_frame in my custom endpoint. Would someone shed some lights on how it
works?</span><o:p></o:p></p>
</div>
</div>
</div>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<div>
<div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:black'> </span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:black'>My questions about read_frame, write_frame
after reading mod_iax, mod_portaudio and mod_skyiax are:</span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:black'> </span><o:p></o:p></p>
</div>
<div style='margin-left:.5in'>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:black'>1.</span><span style='font-size:7.0pt;
color:black'> </span><span
style='font-size:11.0pt;color:black'>Is it correct that I need to check a flag
(for e.g TFLAG_HUP) of the private object at the beginning of the event
to determine whether I should continue reading audio or just return. The flag
TFLAG_HUP is set when a hangup or kill channel event is detected.</span><o:p></o:p></p>
</div>
</div>
</div>
</blockquote>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Thats
what TFLAG_IO is for, clear the flag the read_frame functions should return
immediately.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'>If you
catch TFLAG_BREAK, on the other side, you should clear it and return a comfort
noise frame ( cng )<o:p></o:p></p>
<div>
<div>
<div style='margin-left:.5in'>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:black'>2.</span><span style='font-size:7.0pt;
color:black'> </span><span
style='font-size:11.0pt;color:black'>Read_frame is called on an interval (how
frequently is the interval ? how do I determine that?) to read audio from my
endpoint.</span><o:p></o:p></p>
</div>
</div>
</div>
<p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'>It
depends on the codec you are using, if you are using 20 packetization time,
it'll be called every 20ms.<o:p></o:p></p>
<div>
<div>
<div style='margin-left:.5in'>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:black'>3.</span><span style='font-size:7.0pt;
color:black'> </span><span
style='font-size:11.0pt;color:black'>What is TFLAG_IO normally used for ?</span><o:p></o:p></p>
</div>
</div>
</div>
<p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'>See
point 1<o:p></o:p></p>
<div>
<div>
<div style='margin-left:.5in'>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:black'>4.</span><span style='font-size:7.0pt;
color:black'> </span><span
style='font-size:11.5pt;color:black'>What is the label “cng” is all
about ? May I know what “cng” stands for and how it is used?</span><o:p></o:p></p>
</div>
</div>
</div>
<p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'>CNG
stands for Comfort Noise Generation, whenever read_frame jumps there, it
returns a frame of silence. It it first initialized on private_t since its
pointless to re-allocate empty frames.<o:p></o:p></p>
<div>
<div>
<div style='margin-left:.5in'>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:black'>5.</span><span style='font-size:7.0pt;
color:black'> </span><span
style='font-size:11.0pt;color:black'>What if read_frame is called while my end
point is not ready to send any audio yet?</span><o:p></o:p></p>
</div>
</div>
</div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>That's
why you set TFLAG_IO whenever you are ready. Also note that it wont be called
until you either pre_answer (go in early media) or answer the channel.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>When
a call is made, switch_ivr_originate() doesn't return until your endpoint is
ready to exchange audio.<o:p></o:p></p>
</div>
<div>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<div>
<div>
<div style='margin-left:.5in'>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:black'>6.</span><span style='font-size:7.0pt;
color:black'> </span><span
style='font-size:11.0pt;color:black'>What is the tech_pvt->cng_frame is used
for? I notice that the *frame is set to tech_pvt->cng_frame if the label
“cng” is reached.</span><o:p></o:p></p>
</div>
</div>
</div>
</blockquote>
<p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'>See
point 4.<o:p></o:p></p>
<div>
<div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:black'> </span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:black'>Thank you very much for even reading my
questions. I tried to look for documents that explains clearly the above
questions but so far no luck. Until now I still don’t have a clear
understanding about these 2 events yet.</span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:black'> </span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:black'>Best Regards</span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:black'> </span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:black'>Alex To</span><o:p></o:p></p>
</div>
</div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:13.5pt;color:black'>_______________________________________________<br>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
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UNSUBSCRIBE:<a href="http://lists.freeswitch.org/mailman/options/freeswitch-dev"
target="_blank">http://lists.freeswitch.org/mailman/options/freeswitch-dev</a><br>
<a href="http://www.freeswitch.org" target="_blank">http://www.freeswitch.org</a><o:p></o:p></p>
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<br>
-- <br>
Anthony Minessale II<br>
<br>
FreeSWITCH <a href="http://www.freeswitch.org/">http://www.freeswitch.org/</a><br>
ClueCon <a href="http://www.cluecon.com/">http://www.cluecon.com/</a><br>
Twitter: <a href="http://twitter.com/FreeSWITCH_wire">http://twitter.com/FreeSWITCH_wire</a><br>
<br>
AIM: anthm<br>
<a href="mailto:MSN%3Aanthony_minessale@hotmail.com">MSN:anthony_minessale@hotmail.com</a><br>
GTALK/JABBER/<a href="mailto:PAYPAL%3Aanthony.minessale@gmail.com">PAYPAL:anthony.minessale@gmail.com</a><br>
IRC: <a href="http://irc.freenode.net">irc.freenode.net</a> #freeswitch<br>
<br>
FreeSWITCH Developer Conference<br>
<a href="mailto:sip%3A888@conference.freeswitch.org">sip:888@conference.freeswitch.org</a><br>
<a href="http://iax:guest@conference.freeswitch.org/888">iax:guest@conference.freeswitch.org/888</a><br>
<a href="mailto:googletalk%3Aconf%2B888@conference.freeswitch.org">googletalk:conf+888@conference.freeswitch.org</a><br>
pstn:213-799-1400<o:p></o:p></p>
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