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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>The LiveMedia library uses the magical
world of select(), which allows for monitoring multiple file handle descriptors
(or in this case, sockets) to monitor for incoming/outgoing data.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>By blocking on this select() call, an event
loop can process multiple socket handles in a single execution context,
effectively giving the impression of multi-threaded behaviour.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>LiveMedia has a scheduler that you
registers a function callback with a specific socket handle. A basic pseudo
code would be:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>loop: <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>{<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>select(descriptor set) </span></font><font
size=2 color=navy face=Wingdings><span style='font-size:10.0pt;font-family:
Wingdings;color:navy'>à</span></font><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'> Blocking call<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>for each SET file handle
in descriptor set<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'> look up
corresponding function handler.<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'> Invoke handler<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>end for<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>}<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><strong><b><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>Jerry Johns</span></font></b></strong><b><font size=2 color=navy
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy;
font-weight:bold'><br>
</span></font></b><em><i><font size=1 color=blue face=Arial><span
style='font-size:7.5pt;font-family:Arial;color:blue'>Design Engineer</span></font></i></em><i><font
size=1 color=blue face=Arial><span style='font-size:7.5pt;font-family:Arial;
color:blue;font-style:italic'><br>
<em><i><font face=Arial><span style='font-family:Arial'>Nuvation Research Corp
- <u1:country-region u2:st="on"><u1:place u2:st="on"><st1:place w:st="on"><st1:country-region
w:st="on">Canada</st1:country-region></st1:place></span></font></i></em><br>
<em><i><font face=Arial><span style='font-family:Arial'></u1:place></u1:country-region>Tel:
(519) 746-2304 ext. 221</span></font></i></em><br>
</span></font></i><font size=1 color=navy face=Arial><span style='font-size:
7.5pt;font-family:Arial;color:navy'><a href="http://www.nuvation.com/"
title="http://www.nuvation.com"><em><i><font face=Arial
title="http://www.nuvation.com"><span title="http://www.nuvation.com"><span
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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'>
live-devel-bounces@ns.live555.com [mailto:live-devel-bounces@ns.live555.com] <b><span
style='font-weight:bold'>On Behalf Of </span></b>Stas Oskin<br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, August 24, 2009 3:14
PM<br>
<b><span style='font-weight:bold'>To:</span></b> LIVE555 Streaming Media -
development & use<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Live-devel] multiple
instances of live555 library</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>Hi Ross.<o:p></o:p></span></font></p>
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<blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;
margin-left:4.8pt;margin-right:0in'>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>You don't do this. Please everybody, read the FAQ!<br>
<br>
The "LIVE555 Streaming Media" software uses an event loop (a single
thread of control) for concurrency, instead of using multiple threads.<o:p></o:p></span></font></p>
</blockquote>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><br>
Sorry for barging into this thread - an architecture question if I may. I
expirirmented with Live555 several times, and got left with a question - if
Live555 supports only a single event-loop, how it's possible to effectively
process multiple real-time sources?<br>
<br>
I mean, if I get packets from 2 sources, there seems no way to process them
both, but only to launch a separate thread (via callback function perhaps)
which would handle them.<br>
<br>
Regards.<o:p></o:p></span></font></p>
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