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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/5/?file=17622#file17622line607" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/channels/chan_local.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 local_write(struct ast_channel *ast, struct ast_frame *f)</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; "> <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; "> <span class="k">if</span> <span class="p">(</span><span class="n">bridge</span> <span class="o">&&</span> <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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<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;">ast_bridged_channel can not be called within chan_local with a local channel pvt locked... This is by no means something anyone should be expected to know. It is safe to unlock and relock the pvt here since we have a reference to it.
unlock(p);
bridge = bridged(ast);
lock(p);</pre>
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<a href="https://reviewboard.asterisk.org/r/1137/diff/5/?file=17622#file17622line610" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/channels/chan_local.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 local_write(struct ast_channel *ast, struct ast_frame *f)</pre></td>
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<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">bridge</span><span class="o">-></span><span class="n">nativeformats</span><span class="p">,</span> <span class="n">p</span><span class="o">-></span><span class="n">owner</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>
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<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; "> <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; "> <span class="n">ast_channel_lock</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; "> <span class="n">ast_format_cap_copy</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">p</span><span class="o">-></span><span class="n">chan</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; "> <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>
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<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>
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<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; "> <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 is a bit complex, but here's what I understand is happening here.
ast is == p->owner.
When ast_bridged_channel(ast) is called you are either getting p->chan, or p->chan->_bridge depending on if p->chan is bridged or not as well.
If that is the case, it is not safe for us to modify the nativeformats of a channel we don't have control of the tech_pvt for... For example how are we to know if the bridged channel is a local channel, a SIP channel or an, IAX channel, and how are we to know it is capable of transmitting and receiving whatever native formats we set it to?</pre>
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<a href="https://reviewboard.asterisk.org/r/1137/diff/5/?file=17622#file17622line613" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/channels/chan_local.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 local_write(struct ast_channel *ast, struct ast_frame *f)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_channel_lock</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="n">ast_format_cap_copy</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">p</span><span class="o">-></span><span class="n">chan</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>
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<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>
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<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; "> <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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<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;">ast is locked here, ast and the tech_pvt must be unlocked before grabbing p->chan's lock.</pre>
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<p>- David</p>
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<p>On July 24th, 2011, 6:56 a.m., irroot wrote:</p>
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<div>Review request for Asterisk Developers.</div>
<div>By irroot.</div>
<p style="color: grey;"><i>Updated July 24, 2011, 6:56 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">(329388)</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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