Re: RTP packet dissection in C#

[Robert Clove <cloverobert () gmail com>]

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

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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