Wireshark · Wireshark-dev: Re: [Wireshark-dev] RTP raw file

["Barco You" <barcojie@xxxxxxxxx>]

Hi Wajdi,

How's it going now, did you try it as Jaap said? I also wonder where the problem is.

On Tue, Mar 18, 2008 at 8:18 AM, Jaap Keuter <jaap.keuter@xxxxxxxxx> wrote:

Hi,

Play around with lame options a bit. First of all '-s 8000' is wrong, it
should be '-s 8'. I don't know what you do when recording both directions, but
having two PCM files, you need to mix them, so they don't clip.

I would suggest using Audacity for this audio work.

Thanx,
Jaap

TORKHANI Wajdi wrote:
> Thank you so much
>
> After 4 weeks I can finally to hear the voice,
> But now I have another problem!
> If i record only one direction the sound run very quickly and if record
> both direction i have a very very very bad quality of voice !!!!
>
> 1-I record the payload in a binary file:
>
> Code:
>
> void rawfile(unsigned char * payload,FILE *f){
> fwrite(payload, 10,1,f);  //10 :because audio data is packed into 80
> bits (10 bytes)
> }
>
> 2- I decode the binary file by using voiceage G729, which gives me a
> file : "16-bit mono PCM speech data sampled at 8000 Hz"
>
> 3- convert PCM file into wav by using Lame with:
> lame --decode -x -r -s 8000 -m m -b 16 file.pcm file.wav
>
> Is it correct ?!
>
> ----- Original Message ----- From: "Jaap Keuter" <jaap.keuter@xxxxxxxxx>
> To: "Developer support list for Wireshark" <wireshark-dev@xxxxxxxxxxxxx>
> Sent: Saturday, March 15, 2008 8:46 PM
> Subject: Re: [Wireshark-dev] RTP raw file
>
>
>> Hi,
>>
>> Have a look at rtp_analysis.c
>>
>> The idea is to 'tap' the RTP packets and write out the payloads into a
>> file.
>> That gives you the stream as seen on the network, actual voip
>> applications use
>> a jitterbuffer to recover from sequence errors and changing network
>> delay.
>>
>> Thanx,
>> Jaap
>>
>> TORKHANI Wajdi wrote:
>>> Hello,
>>>
>>> Im a final year student of engineering. Im doing a project on VOIP
>>> (G.729)
>>>
>>> I must create a voip sniffer (to capture communication VOIP on the LAN)
>>> and then to convert them into audio format.
>>> I succeeded in preparing a sniffer in C++ (by using the library
>>> winpcap) to:
>>> 1-  capture network traffic
>>> 2-  Filtre UDP trafic
>>> 3- Read ethernet,ip,udp and RTP header.
>>> But I do not know how to create a raw file seems the output file created
>>> by Ethereal
>>> (Statistics->RTP->STeam Analysis->save payload-> .raw )
>>>
>>>
>>> Please please help me.
>>>
>>> Thank you so much.
>>>
>>

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-- 
-------------------------------
Enjoy life!
Barco You