Wireshark-bugs: [Wireshark-bugs] [Bug 8355] Support RTP/RTCP multiplexing
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Wed, 17 Apr 2013 04:07:42 +0000

changed bug 8355

What Removed Added
CC   zhengyumingnanjing@gmail.com

Comment # 7 on bug 8355 from 
There is a reference implementation of rfc 5761:

http://doubango.googlecode.com/svn/branches/2.0/doubango/tinyRTP/src/trtp_manager.c#329

static int _trtp_manager_recv_data(const trtp_manager_t* self, const uint8_t*
data_ptr, tsk_size_t data_size, tnet_fd_t local_fd, const struct
sockaddr_storage* remote_addr)
{
    tsk_bool_t is_rtp_rtcp, is_rtcp = tsk_false, is_rtp = tsk_false, is_stun,
is_dtls;

    // defined when RTCP-MUX is disabled and RTCP port is equal to "RTP Port +
1"

    // rfc5764 - 5.1.2.  Reception
    // rfc5761 - 4.  Distinguishable RTP and RTCP Packets

    is_rtp_rtcp = (127 < *data_ptr && *data_ptr < 192);
    if(is_rtp_rtcp){
        is_stun = is_dtls = tsk_false;
        is_rtcp = (self->rtcp.local_socket && self->rtcp.local_socket->fd ==
local_fd);
        if(!is_rtcp && data_size >= 2 && (data_ptr[1] & 0x80)){
            if(is_rtp_rtcp){
                switch((data_ptr[1] & 0x7F)){
                    case 64: case 65: 
                    case 72: case 73: case 74: case 75: case 76:
                    case 77: case 78:
                    case 79: is_rtcp = tsk_true; break;
                }
            }
        }
        is_rtp = !is_rtcp;
    }
    else{
        is_dtls = !is_rtp_rtcp && (19 < *data_ptr && *data_ptr < 64);
        is_stun = !is_dtls && TNET_IS_STUN2_MSG(data_ptr, data_size); /* MUST
NOT USE: "(*data_ptr < 2)" beacause of "Old VAT" which starts with "0x00" */;
    }


http://doubango.googlecode.com/svn/branches/2.0/doubango/tinyRTP/src/rtcp/trtp_rtcp_packet.c#90

Hope this will help.

frank.zheng

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