[Asterisk-video] if2 bit stuffing in app_h324m

[Francesco Emmi]

Hi Klaus


Klaus Darilion wrote:
>>> btw: Why is the mode not bit-reversed? If it is about bit order in 
>>> general I would think that "mode" must be reversed too?
>> No. Mode must not bit reversed. About standards and reason of bit order 
>> I can't answer you. To be honest when dealing with amr stuff we found 
>> that it is difficult to retrieve informations from specifications (or at 
>> least I had no much time to do it...) and helped ourselves by looking 
>> directly h223 dumps coming from 3g mobiles.
> 
> btw: what about having dump files which we can analyze with wireshark? I 
> know at least that it supports h245 and should also support AMR. But I 
> have no clue how to export the data to feed it into wireshark.
> 
Wireshark is for me a fundamental instrument and I used it widely when 
dealing with h324m (and above all with amr).

I use to analize h223_*in.raw or h223_*out.raw files that libh324m logs 
  in /tmp directory
These are the steps to import it into wireshark:

1) $ od -v -Ax -tx1 h223_1975da90_in.raw | text2pcap -d -m 5000 
-T1234,1234 - nokia.pcap

2) $ wireshark nokia.pcap

3) Analyze->Decode As then click on Transport, select "both" on TCP and 
H223 on the protocol list.

4) Then I use to export everything in a txt file becouse according to me 
it's easier to analyze:
    File->Export->"As plain text". select "all expanded" and click ok	

The result is a text file very easy to analyze in which you find 
everything mobile phone has said to libh324m in a human readable way.

Greeting
Francesco

ps. I'm using Wireshark 0.99.4

> regards
> klaus
> 
> 
> 
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Francesco Emmi
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