November 2008 - h323plus - lists.packetizer.com

PTimedMutex::Wait patch
by Nir Soffer 17 Feb '09

17 Feb '09

In PTimedMutex::Wait(const PTimeInterval & waitTime), when pthread_mutex_timedlock is not available or broken (it is broken on our arm platform), the code always sleeps before checking the finish time, which is incorrect. For example, if you call Wait(0), and fail to acquire the lock, you will sleep for 10 milliseconds before you get back the retrun value. This is a bigger issue if you use H323EndPoint::FindConnectionWithLock: PWaitAndSignal mutex(connectionsMutex); H323Connection * connection; while ((connection = FindConnectionWithoutLocks(token)) != NULL) { // XXX this will block for 10 milliseconds if the lock can not be acquired! // TryLock calls Wait(0) which sleeps for 10ms on failure switch (connection->TryLock()) { case 0 : return NULL; case 1 : return connection; } // Could not get connection lock, unlock the endpoint lists so a thread // that has the connection lock gets a chance at the endpoint lists. connectionsMutex.Signal(); PThread::Sleep(20); connectionsMutex.Wait(); } return NULL; The code try sleep for 20 milliseconds while the connectionsMutex is unlocked, letting the other thread that hold the connection a chancee to use the endpoint lists, but for each 30 milliseconds cycle, it keeps the endpoint lists locked for 10 milliseconds. Attached a trivial fix. Best Regards, Nir Soffer

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how to support directshow
by JobsGuo(Guo Huayong) 10 Dec '08

10 Dec '08

Hi,all. when I compile the ptlib-v2_0_1,I find the config in ptbuildopts.h show below: ///////////////////////////////////////////////// // // DirectX Support (Windows only) // #ifndef _WIN32_WCE #define P_DIRECTSOUND 1 #undef P_DIRECTSHOW #undef P_VFW_CAPTURE #endif So I can not get the directshow support.but I can get the directsound support.I indeed install directx 9.0c.so it can find the directx file. but why it can not find the directshow? Besides,I also can not find the dshow.h. Who can help me ?thanks! 2008-11-28 JobsGuo(Guo Huayong) Mobile：13918103120 QQ ： 360480589 MSN ： ghyhust(a)hotmail.com

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t38modem and freebsd tty error
by Christopher 25 Nov '08

25 Nov '08

Hello... I am trying to run t38modem on a freebsd 6.x server (also running hylafax). Apparently the t38modem binary cannot attach to the tty device. PseudoModemPty::OpenPty tcgetattr ptypa ERROR: Resource temporarily unavailable I have tried many different combinations of tty choices and args, but all fail in the same way. Am I missing something? Or is this a bug? I compiled with: ptlib-v2_0_1-4 ./configure --enable-openh323 gmake h323plus-v1_20_2 ./configure --enable-t38 gmake t38modem-1.0.1 gmake optnoshared [chrismcc@qwip t38modem-1.0.1]$ sudo ./obj_FreeBSD_x86_r/t38modem -p ttypa --no-gatekeeper --trace --trace --trace --trace T38Modem Version 1.0.1 by OpenH323 Project on Unix FreeBSD (6.2-RELEASE-p12-i386) 2008/11/25 10:52:15.110 T38Modem Version 1.0.1 by OpenH323 Project on Unix FreeBSD (6.2-RELEASE-p12-i386) at 2008/11/25 10:52:15.111 2008/11/25 10:52:15.111 T38Modem T38Modem Version 1.0.1 on Unix FreeBSD (6.2-RELEASE-p12-i386) 2008/11/25 10:52:15.111 T38Modem PWLib File handle high water mark set: 8 Thread unblock pipe 2008/11/25 10:52:15.111 T38Modem PWLib Thread high water mark set: 3 2008/11/25 10:52:15.112 T38Modem H323 Created endpoint. 2008/11/25 10:52:15.112 T38Modem PWLib File handle high water mark set: 10 Thread unblock pipe 2008/11/25 10:52:15.112 T38Modem PseudoModemList::Append ptypa (0) OK 2008/11/25 10:52:15.112 T38Modem PWLib Thread high water mark set: 4 2008/11/25 10:52:15.112 T38Modem H323 Added capability: G.711-uLaw-64k <1> 2008/11/25 10:52:15.112 T38Modem H323 Added capability: G.711-ALaw-64k <2> 2008/11/25 10:52:15.112 T38Modem H323 Added capability: T.38-UDP <3> 2008/11/25 10:52:15.113 T38Modem H323 Added capability: UserInput/basicString <4> Codecs (in preference order): Table: G.711-uLaw-64k <1> G.711-ALaw-64k <2> T.38-UDP <3> UserInput/basicString <4> Set: 0: 0: G.711-uLaw-64k <1> G.711-ALaw-64k <2> T.38-UDP <3> UserInput/basicString <4> 2008/11/25 10:52:15.113 T38Modem PWLib File handle high water mark set: 12 Thread unblock pipe 2008/11/25 10:52:15.113 T38Modem PWLib File handle high water mark set: 13 PTCPSocket 2008/11/25 10:52:15.113 T38Modem H323 Started listener Listener[ip $*:1720] 2008/11/25 10:52:15.113 T38Modem PWLib Thread high water mark set: 5 Waiting for incoming calls for "T38Modem v1.0.1" 2008/11/25 10:52:15.114 H323 Liste...er:8363c00 H323 Awaiting TCP connections on port 1720 2008/11/25 10:52:15.114 H323 Cleaner H323 Started cleaner thread 2008/11/25 10:52:15.115 ptypa(b):1...:137727488 RenameCurrentThread old ThreadName=PseudoModemPty:08358c00 2008/11/25 10:52:15.115 ptypa(b):1...:137727488 Started for /dev/ttypa (accepts all) 2008/11/25 10:52:15.115 H323 Liste...er:8363c00 TCP Waiting on socket accept on ip$*:1720 2008/11/25 10:52:15.115 ptypa(b):1...:137727488 MyH323EndPoint::OnMyCallback command=addmodem extra=10 2008/11/25 10:52:15.115 ptypa(b):1...:137727488 PseudoModemQ::Enqueue ptypa 2008/11/25 10:52:15.115 ptypa(b):1...:137727488 MyH323EndPoint::OnMyCallback request={ command=addmodem response=confirm modemtoken=ptypa } 2008/11/25 10:52:15.115 ptypa(b):1...:137727488 PseudoModemPty::OpenPty tcgetattr ptypa ERROR: Resource temporarily unavailable 2008/11/25 10:52:15.116 ptypa(b):1...:137727488 Stopped -- Christopher <chrismcc(a)pricegrabber.com>

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Re: [h323plus] openmcu/openh323 plus problem.
by Marcos Fábio Jardini 05 Nov '08

05 Nov '08

The CVS code is neutral, compiles in any POSIX compliant system. You will need to inform to the 'configure' program the default system output folder and set proper enviroment variables, some systems need a little more tricks on the config.in file, but not the case of Debian. Last time I have compiled H323Plus in Linux was on the Debian Etch/4.0 2008/11/5 <Amogh.Kulkarni(a)shinsei-it.com> > Hi, > > Thank you for your mail. > > On which flavor like redhat or debian compilation of CVS code is easy. > > > Regards > Amogh k > > ------------------------------ > *From:* h323plus-bounces(a)lists.packetizer.com [mailto: > h323plus-bounces(a)lists.packetizer.com] *On Behalf Of *Marcos Fabio Jardini > *Sent:* Tuesday, November 04, 2008 8:13 PM > *To:* h323plus(a)lists.packetizer.com > *Subject:* Re: [h323plus] openmcu/openh323 plus problem. > > Hello Kulkarni > 1st of all, debian repository is a bit outdated about OpenMCU, try always > get the sources from sourceforge repository and try compile. > Unfortunatly is it not so simple like 'install and use'.... you need enter > at last one time on OpenMCU Config Page (by browser) and confirm/adjust some > settings. > MCU and Client can not run on same machine unless you set a different > service port and rtp/udp port-range for the MCU or for the Client. > > >Gnomemeeting is giving error as " no comman codec"< ('common' ?) > Gnomemeeting can't find a codec that are common by client and MCU, so > connection is droped (strange, at minimun by ITU H.323 specification each > endpoint MUST accept PCM A/u-Law codecs, OpenMCU are compiled with > build-in/static PCM codecs) > > Compiling the CVS code can be a little pain but worked fine with Netmeeting > (not 100%, bug on netmeeting), Ekiga, DCSClient (our native/java mixed > client) and other clients. > > 2008/11/4 <Amogh.Kulkarni(a)shinsei-it.com> > >> Hi, >> >> I have installed openMCU version 2.2.1 (debian repository) >> >> OpenH323 version is libopenh323-1.19.1 ( debian repository) >> >> OpenMCU starts properly in daemon mode ( openmcu -d ) >> >> But netmeeting, Gnomemeeting and xmeeting are not able to connect. >> >> Gnomemeeting is giving error as " no comman codec" >> >> Can anybody help me on this to resolve this issue? >> >> Regards >> Amogh K >> >> >> >> >> This e-mail is confidential and may be legally privileged. If you are not >> the intended recipient, please notify the sender immediately and delete this >> e-mail. >> >> >> ????????????????????????????????????????????????????????????????????????????????????????????????????????????????????? >> > > > > -- > ----- > Jogue RPG, alimente o lado criativo! > > > This e-mail is confidential and may be legally privileged. If you are not > the intended recipient, please notify the sender immediately and delete this > e-mail. > > > ????????????????????????????????????????????????????????????????????????????????????????????????????????????????????? > -- ----- Jogue RPG, alimente o lado criativo!

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IE element decode
by robertp 04 Nov '08

04 Nov '08

lo, i've been harnessing the Q931 class of h323plus to decode packets off the wire, however i'm a little confused as to how h323plus decodes the contents of the information elements which are contained within Q931. i assumed (apparently wrongly) that you would do a check for an element by using Q931.HasIE(), get the byte array of the IE using Q931.GetIE(), then call something like Q931.decodeUserUserIE which returns a structure of some sort which can have methods such as getConferenceGuid() called upon it. I've done the first few steps upto GetIE(), and i now have a PBYTEARRAY of the IE, but i've no idea what to do with it now to decode its contents in a workable, consistent manner. I've poured through the h323+ code, but i cant seem to find where the code deals with this problem. perhaps h323pdu plays a role ?? -- To clarify, i'm sniffing packets off the wire, i.e: mid call, so i'm not an endpoint in the call, rather a onlooker. I don't have transport objects or anything such, i just want to decode the packets and view their contents. - Thanks in advance.

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openmcu/openh323 plus problem.
by Amogh.Kulkarni＠shinsei-it.com 04 Nov '08

04 Nov '08

Hi, I have installed openMCU version 2.2.1 (debian repository) OpenH323 version is libopenh323-1.19.1 ( debian repository) OpenMCU starts properly in daemon mode ( openmcu -d ) But netmeeting, Gnomemeeting and xmeeting are not able to connect. Gnomemeeting is giving error as " no comman codec" Can anybody help me on this to resolve this issue? Regards Amogh K This e-mail is confidential and may be legally privileged. If you are not the intended recipient, please notify the sender immediately and delete this e-mail. ?????????????????????????????????????????????????????????????????????????????????????????????????????????????????????

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