[Freeswitch-users] Extract audio from PCAP

[Avi Marcus]

Is an i7 desktop fast enough? the RTP extraction was quick (IO bound,
likely)
That second step to convert to .raw... not quick at all.
-Avi

core #0:

avi at avi-i7 ~ $ cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 42
model name : Intel(R) Core(TM) i7-2600K CPU @ 3.40GHz
stepping : 7
cpu MHz : 3401.000
cache size : 8192 KB
physical id : 0
siblings : 8
core id : 0
cpu cores : 4
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 13
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat
pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm
constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc
aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr
pdcm sse4_1 sse4_2 popcnt aes xsave avx lahf_lm ida arat epb xsaveopt pln
pts dts tpr_shadow vnmi flexpriority ept vpid
bogomips : 6823.99
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:



On Wed, Mar 6, 2013 at 11:18 PM, Michael Collins <msc at freeswitch.org> wrote:

>
>
> On Wed, Mar 6, 2013 at 12:11 PM, Avi Marcus <avi at avimarcus.net> wrote:
>
>> Wow, that's a complicated procedure.
>> Identify the IP, then extract the rtp, then convert that to raw audio,
>> then you need to know exactly what type of raw audio to open it.
>> By the way, I tried processing a 230mb PCAP.. that last batch with the
>> for  loops sucked an entire core and I stopped it after like 15 mins.
>> Payloads was 238mb and the sounds.raw only got up to 53mb before I stopped
>> it.. I don't know how far it would have gotten.
>>
>> Michael, is there something faster? :)
>> -Avi
>>
>> Faster processor? :)
>
> You need to assemble all of those packets, no way around it. I am working
> on a script to handle that but it's nowhere near ready for public
> consumption. Believe me, if you only need to get the RTP from a pcap then
> that procedure is not too difficult. (You could probably have done it in
> less time than it took to write that email. ;)
>
> I've wrapped that process into a script but I'm trying to handle all the
> other stuff like getting each stream extracted and then launching sox or
> the the new-and-improved fs_encode to convert from raw audio to wav file.
> I'll let everyone know when it is done and put it up on the wiki.
>
> -MC
>
>
>>
>> On Wed, Mar 6, 2013 at 9:45 PM, Michael Collins <msc at freeswitch.org>wrote:
>>
>>> I like that cool Perl script. I'll have to try that some time. In the
>>> meantime you can use tshark to extract the rtp and then use sox to turn
>>> them into wav files. I'm working on a script to do that automatically, but
>>> in the meantime this post should help:
>>>
>>>
>>> http://gteissier.wordpress.com/2010/03/02/tshark-the-swiss-army-knife-of-packet-analysis/
>>>
>>> -MC
>>>
>>>
>>> On Sun, Mar 3, 2013 at 4:40 PM, shouldbe q931 <shouldbeq931 at gmail.com>wrote:
>>>
>>>> On Sun, Mar 3, 2013 at 11:40 PM, Avi Marcus <avi at avimarcus.net> wrote:
>>>> > I've have some really large PCAPs sometimes and wireshark just dies
>>>> trying
>>>> > to decode the audio in them.
>>>> >
>>>> > All the links for audio extraction on voipinfo seem really old.
>>>> >
>>>> > Is there something else to extract the audio from pcaps? Or some
>>>> command to
>>>> > to pass tshark to just save all audio as a .wav file?
>>>> >
>>>> > What does voipmonitor use?
>>>> > I think I asked this before...
>>>> >
>>>> > Thanks,
>>>> > -Avi Marcus
>>>>
>>>> How big are the pcap files ?
>>>>
>>>> you could use editcap to split them up into more manageable chunks,
>>>> and then use wireshark...
>>>> http://www.wireshark.org/docs/man-pages/editcap.html
>>>>
>>>> I've not either but, youmight look at
>>>>
>>>> http://frox25.no-ip.org/~mtve/wiki/RtpExtract.html
>>>>
>>>> and
>>>>
>>>> http://www.netresec.com/?page=NetworkMiner
>>>>
>>>> Cheers
>>>>
>>>> Arne
>>>>
>>>>
>>>> _________________________________________________________________________
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>>>>
>>>> 
>>>> 
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>>>
>>>
>>>
>>> --
>>> Michael S Collins
>>> Twitter: @mercutioviz
>>> http://www.FreeSWITCH.org
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>>>
>>>
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>>> 
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>>
>> _________________________________________________________________________
>> Professional FreeSWITCH Consulting Services:
>> consulting at freeswitch.org
>> http://www.freeswitchsolutions.com
>>
>> 
>> 
>>
>> Official FreeSWITCH Sites
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>>
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>>
>
>
> --
> Michael S Collins
> Twitter: @mercutioviz
> http://www.FreeSWITCH.org
> http://www.ClueCon.com
> http://www.OSTAG.org
>
>
> _________________________________________________________________________
> Professional FreeSWITCH Consulting Services:
> consulting at freeswitch.org
> http://www.freeswitchsolutions.com
>
> 
> 
>
> Official FreeSWITCH Sites
> http://www.freeswitch.org
> http://wiki.freeswitch.org
> http://www.cluecon.com
>
> FreeSWITCH-users mailing list
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