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

["TORKHANI Wajdi" <wajdi.torkhani@xxxxxxxxxxx>]

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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