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<base href="https://bugs.freedesktop.org/" />
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<th>Priority</th>
<td>medium
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<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - SAP announcements contain wrong information"
href="https://bugs.freedesktop.org/show_bug.cgi?id=62636">62636</a>
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<th>CC</th>
<td>lennart@poettering.net
</td>
</tr>
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<th>Assignee</th>
<td>pulseaudio-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Summary</th>
<td>SAP announcements contain wrong information
</td>
</tr>
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<th>QA Contact</th>
<td>pulseaudio-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Reporter</th>
<td>wrsmith@gmail.com
</td>
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<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Component</th>
<td>modules
</td>
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<th>Product</th>
<td>PulseAudio
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=76905" name="attach_76905" title="python script to listen to SAP announcements from PulseAudio.">attachment 76905</a> <a href="attachment.cgi?id=76905&action=edit" title="python script to listen to SAP announcements from PulseAudio.">[details]</a></span>
python script to listen to SAP announcements from PulseAudio.
I set up two Ubuntu machines, both with PulseAudio.
In one machine (Ubuntu 12.04), I set it up to act as a network audio device. In
the other machine (Ubuntu 12.10), I set it up to use the network audio device.
I took a tcpdump of the traffic going between the two computers. I extracted
the PCM audio. I was unable to play it with the parameters from the SAP
announcement, which are as follows. The garbled characters were also there in
the announcement. I captured the SAP announcement using a small python script
(attached).
u]
�kapplication/sdpv=0
o=william 3572777767 0 IN IP4 192.168.1.23
s=PulseAudio RTP Stream on william-X101CH
c=IN IP4 224.0.0.56
t=3572777767 0
a=recvonly
m=audio 46194 RTP/AVP 10
a=rtpmap:10 L16/44100/2
a=type:broadcast
When I played back the audio I extracted from the tcpdump, I was able to play
it like this. As you can see, the parameters are quite different from the SAP
announcements.
aplay -t raw -c 2 -f S32_LE -r 44100 myrawaudio.dat
(The parameters from the SAP announcement just caused it to play white noise.)</pre>
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