Re: RTP packet dissection in C#

[Richard Sharpe <realrichardsharpe () gmail com>]

On Fri, Nov 17, 2017 at 7:40 AM, Robert Clove <cloverobert () gmail com> wrote:
> Hey,
>
> Really thanks for the link.
> If you can help me with the following.
> I have code that dissect the RTP packet in C#(as follows), but i don't get
> the events here, if you can help me writing the code here

Are you asking for help with your homework?

> private void Rtsp_client_DataReceived(object sender, Rtsp.RtspChunkEventArgs
> e)
>       {
>           // RTP Packet Header
>           // 0 - Version, P, X, CC, M, PT and Sequence Number
>           //32 - Timestamp
>           //64 - SSRC
>           //96 - CSRCs (optional)
>           //nn - Extension ID and Length
>           //nn - Extension header
>
>           int rtp_version =      (e.Message.Data[0] >> 6);
>           int rtp_padding =      (e.Message.Data[0] >> 5) & 0x01;
>           int rtp_extension =    (e.Message.Data[0] >> 4) & 0x01;
>           int rtp_csrc_count =   (e.Message.Data[0] >> 0) & 0x0F;
>           int rtp_marker =       (e.Message.Data[1] >> 7) & 0x01;
>           int rtp_payload_type = (e.Message.Data[1] >> 0) & 0x7F;
>           uint rtp_sequence_number = ((uint)e.Message.Data[2] << 8) +
> (uint)(e.Message.Data[3]);
>           uint rtp_timestamp = ((uint)e.Message.Data[4] <<24) +
> (uint)(e.Message.Data[5] << 16) + (uint)(e.Message.Data[6] << 8) +
> (uint)(e.Message.Data[7]);
>           uint rtp_ssrc =      ((uint)e.Message.Data[8] << 24) +
> (uint)(e.Message.Data[9] << 16) + (uint)(e.Message.Data[10] << 8) +
> (uint)(e.Message.Data[11]);
>
>           int rtp_payload_start = 4 // V,P,M,SEQ
>                               + 4 // time stamp
>                               + 4 // ssrc
>                               + (4 * rtp_csrc_count); // zero or more csrcs
>
>           uint rtp_extension_id = 0;
>           uint rtp_extension_size = 0;
>           if (rtp_extension == 1)
>           {
>               rtp_extension_id = ((uint)e.Message.Data[rtp_payload_start +
> 0] << 8) + (uint)(e.Message.Data[rtp_payload_start + 1] << 0);
>               rtp_extension_size = ((uint)e.Message.Data[rtp_payload_start +
> 2] << 8) + (uint)(e.Message.Data[rtp_payload_start + 3] << 0);
>               rtp_payload_start += 4 + (int)rtp_extension_size;  //
> extension header and extension payload
>           }
> }
>
>
>
> On Fri, Nov 17, 2017 at 8:33 PM, Jaap Keuter <jaap.keuter () xs4all nl> wrote:
> > Hi,
> >
> > We don’t have one, or at least non written in C#. If you would be
> > interested in the C code of the RTP event dissector, that would be:
> >
> > https://code.wireshark.org/review/gitweb?p=wireshark.git;a=blob;f=epan/dissectors/packet-rtp-events.c;hb=HEAD
> >
> > Thanks,
> > Jaap
> >
> >
> > On 17 Nov 2017, at 15:34, Robert Clove <cloverobert () gmail com> wrote:
> >
> > Hi,
> >
> > Can anyone point me to the library written in C# which dissect the RTP
> > packet.
> > I am mainly interested in the DTMF events.
> >
> > --Clove
> >
> > ___________________________________________________________________________
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> >
> >
> >
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>
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-- 
Regards,
Richard Sharpe
(何以解憂？唯有杜康。--曹操)
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