[Live-devel] Support for DSCP in Live555

[Kjeld Mathias Petersen]

Dear Sir

We have a request to your Live555 library,
that it shall be possible to set the DSCP value for Linux,
when a connection is opened.

We would like to suggest an additional method in GroupsockHelper, that sets the DSCP value
Boolean setSocketDSCP(int sock, u_int8_t dscp) {
#if defined(__WIN32__) || defined(_WIN32)
    // DSCP can't be set in Windows
#else
    if (dscp > 63) return False;
    const u_int8_t value = dscp << 2;
    if (setsockopt(sock, IPPROTO_IP, IP_TOS, (void*)&value, sizeof value) < 0)
        return False;
#endif
    return True;
}

And a call to this method from
int RTSPClient::openConnection() {
    ...
    fInputSocketNum = setupStreamSocket(envir(), 0);
    if (fInputSocketNum < 0) break;
    ignoreSigPipeOnSocket(fInputSocketNum); // so that servers on the same host that get killed don't also kill us
    if (fOutputSocketNum < 0) fOutputSocketNum = fInputSocketNum;
    setSocketDSCP(fInputSocketNum, _dscp);
    if (fOutputSocketNum != fInputSocketNum)
        setSocketDSCP(fOutputSocketNum, _dscp);

This require the RTSPClient to have a _dscp member that can be set by a method:
void RTSPClient::setDSCP(u_int8_t dscp)
{
    if (dscp > 63) return;
    _dscp = dscp;
}

The _dscp value should be initialized in the constructor to the default value 0.

Please
Could you consider our request

For you reference:
https://da.wikipedia.org/wiki/Differentiated_Services


Med venlig hilsen/ Best Regards

Kjeld Mathias Petersen
Software Developer
Communication Solutions
Business Area Surveillance

Tel.:  + 45 3638 3000
Mobile: + 45 4187 6042
E-mail: kjeld.petersen at dk.saabgroup.com<mailto:kjeld.petersen at dk.saabgroup.com>


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