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This is an automatically generated e-mail. To reply, visit:
<a href="https://reviewboard.asterisk.org/r/1137/">https://reviewboard.asterisk.org/r/1137/</a>
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<a href="https://reviewboard.asterisk.org/r/1137/diff/9/?file=20952#file20952line658" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/channels/chan_local.c</a>
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(Diff revision 9)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int local_fixup(struct ast_channel *oldchan, struct ast_channel *newchan)</pre></td>
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<th bgcolor="#e9eaa8" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2">657</font></th>
<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="kt">int</span> <span class="n">isoutbound</span><span class="p">;</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="kt">int</span> <span class="n">isoutbound</span> <span class="o">=</span> <span class="n">IS_OUTBOUND</span><span class="p">(</span><span class="n">ast</span><span class="p">,</span> <span class="n">p</span><span class="p">);</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">We check to see if p is NULL or not right below this. This macro will dereference p which could cause a crash.</pre>
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<a href="https://reviewboard.asterisk.org/r/1137/diff/9/?file=20952#file20952line705" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/channels/chan_local.c</a>
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(Diff revision 9)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int local_indicate(struct ast_channel *ast, int condition, const void *data, size_t datalen)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></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="o">!</span><span class="n">isoutbound</span> <span class="o">&&</span> <span class="p">(</span><span class="n">condition</span> <span class="o">==</span> <span class="n">AST_CONTROL_SRCUPDATE</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; "></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">bridge</span> <span class="o">=</span> <span class="n">ast_bridged_channel</span><span class="p">(</span><span class="n">ast</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; "></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ao2_lock</span><span class="p">(</span><span class="n">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; "></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="cm">/* fixup audio formats nativeformat might have changed we must adjust.</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> * ast is p->owner and is locked here*/</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></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">p</span><span class="o">-></span><span class="n">chan</span> <span class="o">&&</span> <span class="n">bridge</span> <span class="o">&&</span> <span class="p">(</span><span class="n">bridge</span> <span class="o">!=</span> <span class="n">p</span><span class="o">-></span><span class="n">chan</span><span class="p">)</span> <span class="o">&&</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="o">!</span><span class="n">ast_format_cap_identical</span><span class="p">(</span><span class="n">bridge</span><span class="o">-></span><span class="n">nativeformats</span><span class="p">,</span> <span class="n">ast</span><span class="o">-></span><span class="n">nativeformats</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; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">711</font></th>
<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="o">!</span><span class="n">ast_channel_trylock</span><span class="p">(</span><span class="n">p</span><span class="o">-></span><span class="n">chan</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; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">712</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_format_cap_copy</span><span class="p">(</span><span class="n">ast</span><span class="o">-></span><span class="n">nativeformats</span><span class="p">,</span> <span class="n">bridge</span><span class="o">-></span><span class="n">nativeformats</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; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">713</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_set_read_format</span><span class="p">(</span><span class="n">ast</span><span class="p">,</span> <span class="o">&</span><span class="n">ast</span><span class="o">-></span><span class="n">readformat</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; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">714</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_set_write_format</span><span class="p">(</span><span class="n">ast</span><span class="p">,</span> <span class="o">&</span><span class="n">ast</span><span class="o">-></span><span class="n">writeformat</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; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">715</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_format_cap_copy</span><span class="p">(</span><span class="n">p</span><span class="o">-></span><span class="n">chan</span><span class="o">-></span><span class="n">nativeformats</span><span class="p">,</span> <span class="n">bridge</span><span class="o">-></span><span class="n">nativeformats</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; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">716</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_set_read_format</span><span class="p">(</span><span class="n">p</span><span class="o">-></span><span class="n">chan</span><span class="p">,</span> <span class="o">&</span><span class="n">p</span><span class="o">-></span><span class="n">chan</span><span class="o">-></span><span class="n">readformat</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; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">717</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_set_write_format</span><span class="p">(</span><span class="n">p</span><span class="o">-></span><span class="n">chan</span><span class="p">,</span> <span class="o">&</span><span class="n">p</span><span class="o">-></span><span class="n">chan</span><span class="o">-></span><span class="n">writeformat</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; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">718</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_channel_unlock</span><span class="p">(</span><span class="n">p</span><span class="o">-></span><span class="n">chan</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; "></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; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">720</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_verb</span><span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="s">"Tried to get lock on %s to set audio format but failed</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span> <span class="n">p</span><span class="o">-></span><span class="n">chan</span><span class="o">-></span><span class="n">name</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; "></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; "></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; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">723</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">f</span><span class="p">.</span><span class="n">subclass</span><span class="p">.</span><span class="n">integer</span> <span class="o">=</span> <span class="n">condition</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; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">724</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">f</span><span class="p">.</span><span class="n">data</span><span class="p">.</span><span class="n">ptr</span> <span class="o">=</span> <span class="p">(</span><span class="kt">void</span><span class="o">*</span><span class="p">)</span><span class="n">data</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; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">725</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">f</span><span class="p">.</span><span class="n">datalen</span> <span class="o">=</span> <span class="n">datalen</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; "></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">res</span> <span class="o">=</span> <span class="n">local_queue_frame</span><span class="p">(</span><span class="n">p</span><span class="p">,</span> <span class="n">isoutbound</span><span class="p">,</span> <span class="o">&</span><span class="n">f</span><span class="p">,</span> <span class="n">ast</span><span class="p">,</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; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">727</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ao2_unlock</span><span class="p">(</span><span class="n">p</span><span class="p">);</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">This locking is going to be tricky.
I think this will work... After you get the bridge channel, detect if a format change is necessary. If so copy the native formats of the bridge to a temporary format_cap structure.
grab a reference to the p->chan channel and unlock p right after you detect a change has occurred.
At this point only the ast channel (p->owner) is locked. Copy the native formats over to ast and do all the read and write setting.
unlock the ast channel, at this point no locks are held.
lock the reference to p->chan you got earlier.
copy all the native formats stuff to that channel reference.
unlock the p->chan reference.
unref the p->chan reference.
lock ast
lock p
the do the local_queue_frame
then unlock p at the end of the else if like you already are doing.</pre>
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<p>- David</p>
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<p>On September 30th, 2011, 8:06 a.m., irroot wrote:</p>
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<div>Review request for Asterisk Developers and David Vossel.</div>
<div>By irroot.</div>
<p style="color: grey;"><i>Updated Sept. 30, 2011, 8:06 a.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;">This is a most annoying pain and tripped me up no end testing the T38 gateway patch for res_fax.
Scenario :-
i have a Linksys 2102 on a fax machine that uses G.729 and switches to ALAW on CNG and then negotiates T.38
this is awesome as i can now Chat/Fax from same terminal using most effective bandwidth [these are to be deployed
on sugar cane farms surrounding the kruger park here in south africa over wi-fi]
for testing purposes im using a local channel into T.30 fax app in res_fax.
Problem :-
when the device reinvites ALAW then T.38 it leaves the nativeformat on chan_local as G.729 this will not work
as it is transcoding the FAX from G.729 to SLIN this will not work and took me a while to spot the problem.
Soloution :-
Check the format on the proxy and adjust it if it changes this should be what Local does been a proxy of the channel
it should follow changes ...
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>/trunk/channels/chan_local.c <span style="color: grey">(338435)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/1137/diff/" style="margin-left: 3em;">View Diff</a></p>
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