2007/11/22, Ross Finlayson <[EMAIL PROTECTED]>: > > I don't follow this. The "forceMulticastOnUnspecified" hack - which > is used only if a multicast address was *not* specified in SDP - > cannot possibly be expected to work for SSM sessions, because, for > such sessions, the source filter address can only be specified within > a SDP description. > I have no plans to change the existing code at this time. > > Do you mean according to RFC 2326 that an RTSP server should or must explicitly specify whether the session is unicast or multicast (by providing a multicast address) rather than give the client a chance to choose either?
And if the server doesn't specify the multicast address in its SDP, the client should only try a regular multicast setup(join/leave) even if the SDP has source-filter attribute? >Besides, the ws2tcpip.h provided in a newly installed Visual Studio > >C++ 6 doesn't define IP_ADD_SOURCE_MEMBERSHIP and > >IP_DROP_SOURCE_MEMBERSHIP so the following conditional macro in > >GroupHelper.cpp wiill define them as wrong values on Windows. > > > >#ifdef LINUX > >#define IP_ADD_SOURCE_MEMBERSHIP 39 > >#define IP_DROP_SOURCE_MEMBERSHIP 40 > >#else > >#define IP_ADD_SOURCE_MEMBERSHIP 25 // should be 15 on Windows > >#define IP_DROP_SOURCE_MEMBERSHIP 26 // should be 16 on Windows > >#endif > > > >Therefore, I suggest modify the above as the following: > > > >#ifdef LINUX > >#define IP_ADD_SOURCE_MEMBERSHIP 39 > >#define IP_DROP_SOURCE_MEMBERSHIP 40 > >#elif defined(WINNT) || defined(_WINNT) > >#define IP_ADD_SOURCE_MEMBERSHIP 15 /* join IP group/source */ > >#define IP_DROP_SOURCE_MEMBERSHIP 16 /* leave IP group/source */ > >#else > >#define IP_ADD_SOURCE_MEMBERSHIP 25 > >#define IP_DROP_SOURCE_MEMBERSHIP 26 > >#endif > > Can anyone else (preferably someone who doesn't use a @gmail.com > email address :-) confirm that Windows uses the values 25 and 26 for > IP_ADD_SOURCE_MEMBERSHIP and IP_DROP_SOURCE_MEMBERSHIP? (But why > doesn't WIndows actually define those constants??) Sorry, I am that guy using a @gmail ^_~ It's easy to reason. MSDN<http://msdn2.microsoft.com/en-us/library/ms738586.aspx>tells that MS supports IP_ADD_SOURCE_MEMBERSHIP and IP_DROP_SOURCE_MEMBERSHIP since Windows XP but Visual C++ 6.0 was release early(1998) before XP(2001). The ws2tcpip.h is updated in newer versions of Visual Studio or the Platform SDK. See ws2tcpip.h<http://www.cs.colorado.edu/%7Emain/cs1300/include/ws2tcpip.h>provided by mingw or that <http://source.winehq.org/source/include/ws2tcpip.h> by wine online for their values for Windows. >#define IP_BLOCK_SOURCE 17 /* block IP group/source */ > >#define IP_UNBLOCK_SOURCE 18 /* unblock IP group/source */ > >#define IP_PKTINFO 19 /* receive packet information for > ipv4*/ > >#define IP_RECEIVE_BROADCAST 22 /* allow/block broadcast reception > */ > > No, I won't be defining those, because they're not used anywhere in our > code. > -- They are mentioned just in case. It's welcome to ignore them currently. BR. Brain Lai
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