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This is an automatically generated e-mail. To reply, visit:
<a href="https://reviewboard.asterisk.org/r/1663/">https://reviewboard.asterisk.org/r/1663/</a>
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<p style="margin-top: 0;">On January 16th, 2012, 3:43 p.m., <b>Matt Jordan</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/1663/diff/5/?file=23189#file23189line542" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/res/res_rtp_asterisk.c</a>
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(Diff revision 5)
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<td colspan="2"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int rtp_learning_rtp_seq_update(struct ast_rtp *rtp, uint16_t seq)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span> <span class="k">else</span> <span class="k">if</span> <span class="p">(</span><span class="n">udelta</span> <span class="o"><</span> <span class="n">LEARNING_MAX_DROPOUT</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="cm">/* in order, with permissible gap */</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="n">seq</span> <span class="o"><</span> <span class="n">rtp</span><span class="o">-></span><span class="n">learning_max_seq</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="cm">/* Sequence number wrapped - count another 64k cycle. */</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">rtp</span><span class="o">-></span><span class="n">learning_cycles</span> <span class="o">+=</span> <span class="n">LEARNING_RTP_SEQ_MOD</span><span class="p">;</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">rtp</span><span class="o">-></span><span class="n">learning_max_seq</span> <span class="o">=</span> <span class="n">seq</span><span class="p">;</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span> <span class="k">else</span> <span class="k">if</span> <span class="p">(</span><span class="n">udelta</span> <span class="o"><=</span> <span class="p">(</span><span class="n">LEARNING_RTP_SEQ_MOD</span> <span class="o">-</span> <span class="n">LEARNING_MAX_MISORDER</span><span class="p">))</span> <span class="p">{</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="cm">/* the sequence number made a very large jump */</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="n">seq</span> <span class="o">==</span> <span class="n">rtp</span><span class="o">-></span><span class="n">learning_bad_seq</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="cm">/*</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> * Two sequential packets -- assume that the other side</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> * restarted without telling us so just re-sync</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> * (i.e., pretend this was the first packet).</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> */</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">rtp_learning_seq_restart</span><span class="p">(</span><span class="n">rtp</span><span class="p">,</span> <span class="n">seq</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">probation</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span> <span class="k">else</span> <span class="p">{</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">rtp</span><span class="o">-></span><span class="n">learning_bad_seq</span> <span class="o">=</span> <span class="p">(</span><span class="n">seq</span> <span class="o">+</span> <span class="mi">1</span><span class="p">)</span> <span class="o">&</span> <span class="p">(</span><span class="n">LEARNING_RTP_SEQ_MOD</span> <span class="o">-</span> <span class="mi">1</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span></pre></td>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">I think this code will still never be executed.
If rtp->learning_probation is 0, then we've returned 0 from this method, as that is what sets probation to 0. In that case, we will exit learning mode.
If we reenter learning mode (at any time), we re-initialize the learning mode counters via rtp_learning_seq_init - which resets rtp->learning_probation to the number of packets we have to see sequentially.
This code looks useful, but should probably be executed inside the else {...} block of if (seq == rtp->learning_max_seq + 1) {
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Actually, yeah, it looks like this code is more about anticipating when to enter learning mode than actually about exiting learning mode. It doesn't need to go anywhere else since we already have our own ways of handling that. I'll go ahead and get rid of all this stuff for now, if we need it again in the future, it will probably be as part of a much larger pjmedia integration.</pre>
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<p style="margin-top: 0;">On January 16th, 2012, 3:43 p.m., <b>Matt Jordan</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/1663/diff/5/?file=23189#file23189line3050" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/res/res_rtp_asterisk.c</a>
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(Diff revision 5)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int rtp_reload(int reload)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">sscanf</span><span class="p">(</span><span class="n">s</span><span class="p">,</span><span class="s">"%d"</span><span class="p">,</span><span class="o">&</span><span class="n">learning_min_sequential</span><span class="p">);</span></pre></td>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Check the return value in case s could not be converted into an integer. You should also specify a maximum width for the conversion specifier.</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Alrighty, got it.</pre>
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<p>- jrose</p>
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<p>On January 16th, 2012, 2:32 p.m., jrose wrote:</p>
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<div>Review request for Asterisk Developers, Kevin Fleming, Matt Jordan, and jcolp.</div>
<div>By jrose.</div>
<p style="color: grey;"><i>Updated Jan. 16, 2012, 2:32 p.m.</i></p>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Description </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">The purpose of this patch is to resolve some problems that can occur with peers using a mix of directmedia=yes and no occuring between multiple asterisk servers when strictrtp is enabled in rtp.conf. When attempting to set the strictrtppeer during a reinvite, res_rtp_asterisk will ignore the requested sockaddr and instead set learning mode. Prior to this patch, learning mode would simply set the sockaddr owning the next related RTP packet received and then exit learning mode. Now, learning mode will track how many times a particular socket address sent rtp packets without being interrupted by another socket address until it reaches the learning mode hit threshold value (set in rtp.conf) and then resume closed mode.</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Testing </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">I tested this against two scenarios with the following configurations... always with strictrtp=yes
s1
Phone 1 <-- DirectMedia=yes --> Asterisk 1 <-- DirectMedia=Yes --> Asterisk 2 <-- DirectMedia=No --> Phone 3
and
s2
Phone 1 <-- DirectMedia=yes --> Asterisk 1 <-- DirectMedia=Yes --> Phone 2
and then doing a blind transfer with:
Phone 2 <-- DirectMedia=yes --> Asterisk 1 <-- DirectMedia=Yes --> Asterisk 2 <-- DirectMedia=No --> Phone 3
Prior to this test, in s1 there would be one way audio from phone 3 to phone 1 because RTP coming from phone 1 would be rejected by Asterisk 2.
In s2, audio would work normally from phone 1 to phone 2, but after the transfer the result would be the same with one way audio from phone 3 to phone 1 due to rejected
packets from phone 1.
After this patch is applied, both of these scenarios worked as expected as long as I used a threshold above 3. Phones 1 and 3 were polycom SP430s while Phone 2 was a Grandstream GXP-2020.</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
<ul style="margin-left: 3em; padding-left: 0;">
<li>/branches/1.8/CHANGES <span style="color: grey">(350939)</span></li>
<li>/branches/1.8/configs/rtp.conf.sample <span style="color: grey">(350939)</span></li>
<li>/branches/1.8/res/res_rtp_asterisk.c <span style="color: grey">(350939)</span></li>
</ul>
<p><a href="https://reviewboard.asterisk.org/r/1663/diff/" style="margin-left: 3em;">View Diff</a></p>
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