[pulseaudio-tickets] [Bug 62636] New: SAP announcements contain wrong information

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=62636

          Priority: medium
            Bug ID: 62636
                CC: lennart at poettering.net
          Assignee: pulseaudio-bugs at lists.freedesktop.org
           Summary: SAP announcements contain wrong information
        QA Contact: pulseaudio-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: wrsmith at gmail.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: modules
           Product: PulseAudio

Created attachment 76905
  --> https://bugs.freedesktop.org/attachment.cgi?id=76905&action=edit
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.)

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