May 2012 - h323plus - lists.packetizer.com

does H323Plus support H,239? Thanks!
by Bo Xu 13 Jun '12

13 Jun '12

Hello, could you tell me id H323Plus support H,239? Thanks! Regards, Bo

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GNU Gatekeeper 3.0 released
by Jan Willamowius 04 May '12

04 May '12

I'm pleased to announce a new major release of the GNu Gatekeeper. Version 3.0 has many new features that will allow even your legacy endpoints to move to a new age of H.323 audio and video communications. You can download the new version at http://www.gnugk.org/h323download.html New features: - full traversal zone support (gatekeeper-to-gatekeeper H.460.18/.19) Now you can place one GnuGk behind a firewall and let it tunnel out the calls for all other devices behind the firewall eg. to a VCS or to another GnuGk. This was probably the most request feature in the past. - full IPv6 support (incl. IPv4-IPv6 proxying) With the proxy function, you can let GnuGk manage a network of IPv6 endpoints and connect them to the IPv4 network or make legacy endpoints reachable for IPv6 calls. - RTP multiplexing (all calls to and from devices supporting H.460.19 will only use 2 sockets total) - rewrite destination IPs into aliases - ENUM, SRV and RDS routing policies extended for LRQs, in case the calling gatekeeper isn't able to do this - notifications when GnuGk opens listen ports This allows you to update firewall rules on the fly, so you only have the minimum amount of ports open. - improved H.235 password authentication with neighbors - massive performance improvement when (re-)loading large numbers of GW rewrites - interop fixes for Polycom m100 and Sorenson endpoints - fixes in the underlying libraries so *BSD systems can get the latest GnuGk features - a few bug fixes We provide executables for Linux (32 and 64 bit), Windows, MacOS X, FreeBSD, OpenBSD, NetBSD and Solaris. Regards, Jan -- Jan Willamowius, Founder of the GNU Gatekeeper Project EMail : jan(a)willamowius.de Website: http://www.gnugk.org Support: http://www.willamowius.com/gnugk-support.html

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Re: [h323plus] H323-SIP Gateway with H264 Support
by Simon Horne 02 May '12

02 May '12

Diego Sorry for delay in replying With Reference to the document you linked to The plugin codec exports 2 functions for capability registration unsigned int PWLibPlugin_GetAPIVersion() <http://www.voxgratia.org/docs/codec_plugins.html#PluginCodec_Definition> PluginCodec_Definition * OpalCodecPlugin_GetCodecs(unsigned * count, unsigned version) The OpalCodecPlugin_GetCodecs function returns all the information you need on the signaling side. Simply supply the codec definitions and the codec will be available in h323plus. You DO NOT need to create the Codec Methods which link to FFMPEG/x264. For only supplying the codecs you need rather than removing them for the call. Clone the Capability List then remove all the orginal and add back the ones you want. In your derived void H323Connection::OnSetLocalCapabilities() H323Capabilities * myCapabilities(localCapabilities); localCapabilities.RemoveAll(); H323Capability * cap = myCapabilities.FindCapability("H.264*"); If (cap) LocalCapabilities.Add(cap); Simon From: Diego Carvalho [mailto:diego.cdomingos2010@gmail.com] Sent: 28 March 2012 06:37 To: Simon Horne Subject: [h323plus] H323-SIP Gateway with H264 Support Hi Simon, thanks for answering again. Today I could establish SIP -> H323 audio calls. So now I only need to deal with the 2 points below. I'm really interested in being able to add H.264 in the capability set without having to link the library with FFMPEG/X264, but I couldn't understand what you explained. I searched on the internet and found this: http://www.voxgratia.org/docs/codec_plugins.html that I believe is related to what you explained but even with this page I couldn't realize what I have to do. Is it possible to configure the plugin that comes with the source in this way? I mean, use the plugin in h323plus/plugin/video/H.264 for only signaling, without have to link with FFMPEG/X264. Another question is again about the capabilities. You said that I can remove the capabilities that aren't supported by the SIP endpoint. But this way, I will have to add all possible capabilities to my gateway and them remove the ones that SIP doesn't support. It would be much easier if my gateway could start without any capabilities and then I add the ones that SIP supports. Is that possible? If not, I will have to do what you explained but when I will add all the capabilities again to be ready to handle the next call? Again, thanks for all the help. 2012/3/23 Simon Horne <s.horne(a)packetizer.com> Diego There is some issues with changes in FFMPEG v54 and a number of function names changed and others were depreciated recommend v52. I am currently working through issues with v54. Again X264 is a moving target but last I looked it compiled on Linux. On Windows is a whole different story unfortunately. If you are only using the codec for signaling there should be no need to link to either FFMPEG or X264 and you can gut the plugins and only define the PluginCodec_Definitions, Plugin_Codec_Implementation() and PLUGIN_CODEC_GET_CODEC_FN. These are the signaling parts of the codec. The Encoder/Decoder contexts can be removed. There is some changes in the CVS to also allow you to load these plugins statically see the openh323buildopt.h.in. To filter capabilities on a call by call basis you can do this by overriding H323Capabilities::OnSetLocalCapabilities() and use the localCapabilities.Remove() function to remove the capabilities not used on the SIP side. Simon From: h323plus-bounces(a)lists.packetizer.com [mailto:h323plus-bounces@lists.packetizer.com] On Behalf Of Diego Carvalho Sent: 23 March 2012 22:44 To: h323plus(a)lists.packetizer.com Subject: Re: [h323plus] H323-SIP Gateway with H264 Support Hi Simon and "chr_cb". First of all, thanks for your help. Today I was able to establish an audio only call between H323 and SIP using the gateway I'm developing. This is great but I still have some problems and I appreciate any help on this: 1) Like I said, it was an audio only call. I was able to compile the plugins with the packages from Ubuntu repositories (libx264-dev, libavcodec-dev and libavutil-dev) but my project also uses ffmpeg and x264 so I would like to compile with the latest source code from git we use. The config.log shows some errors and on the internet I saw somebody saying that only a specific version of ffmpeg allows the compilation. Is that true? If so, what would be the version of ffmpeg and x264 I should use? Again, I would like to reiterate that I only want to have H264 on my capabilities list (I don't want to capture/render video). Do I indeed need the plugin? Is there another way? 2) If I set the gateway capabilities in the beginning it works but I want so set them in a later time. Specifically, I receive the call and send an invite on hold to SIP. Then it will answer with 200 OK with SDP. In this moment, when I have the SIP SDP, I want to set the gateway capabilities based on what the SIP side supports. How can I do this? If I try to add in this moment it simply doesn't add them. Thanks in advance. 2012/3/13 Simon Horne <s.horne(a)packetizer.com> Diego The plugins load default capability instances into the H323Endpoint. When the H323Connection is created these capabilities are cloned In H323Connection::OnSetLocalCapabilities() Simply remove the unmatched capabilities localCapabilities.Remove("H.264*"); The H323_ExternalRTPChannel does not handle RTP but can be used to not use the internal RTP system. You can have your own external RTP stack or not have one at all. You needed to read and populate H245_H2250LogicalChannelParameters in the send and receive message of the class with those of the SIP Client. I do have serious doubts what you are planning will work not because it can't technically work but because of the differences in H.323 and SIP with Video. H.323 is very strict on rules while SIP is very loose on interpretations. Here are the problems 1. RTP packetization H.323 says strictly single NAL SIP is undefined 2 options (Single NAL/Fragmented units) . You will get video on the H.323 side just fine but your SIP side with some devices may not be able to decode. 2. Payload Type for H.264 is specified as being flexible but a lot of SIP implementations have them fixed (usually 96 or 97) so H.323 requests 103 SIP always ends 97 no video on the H.323 side. There is no way you can fix this with signaling as SIP tells the other party what it is going to send and H.323 tells the party what it wants to receive. You have to proxy the media to fix the payload type number. Good luck. Simon ============================================================================ ============================================= From: Diego Carvalho [mailto:diego.cdomingos2010@gmail.com] Sent: 14 March 2012 06:09 To: Simon Horne Subject: Re: [h323plus] H323-SIP Gateway with H264 Support Hi Simon, thanks for answering but I still have some doubts: You said that this plugin will add the capability automatically. Actually, as I said, I'm building a H323-SIP gateway so, for instance, when the SIP endpoint is making a call I want to add the H264 capability only if the SIP endpoint offers it. Will I be able to add the capability manually? For instance, using localCapabilities.Add(new H323_H264Capability()). To sumarize, I want to be able to add (or remove if it was automatically added and the current call does not offer it) manualy the H264 capability. Also I don't know if the H323_ExternalRTPChannel applies to my situation. It's used to pass the RTP to another device. I don't want to handle the RTP at all (to be clear: I don't want RTP arriving on the gateway's network card). I want to send to h323 the RTP address/port SIP offered and vice-versa, so the RTP will flow directly between the endpoints. Any thoughts? Thanks in advance. 2012/3/13 Simon Horne <s.horne(a)packetizer.com> Diego H.264 is a video plugin in the plugin/video directory. You will need X264 and FFMPEG. For Ubuntu they are libx264-dev libavcodec-dev and libavutil-dev. You build the plugin .so and the helper (in the gpl subdirectory) and place them both in the same directory as you app. The application will load them at startup and automatically add the capability to the capabilityset etc If you don't want to use the plugin for RTP then have a look at the H323_ExternalRTPChannel. This will bypass the RTP handling in the codec to whatever you want. http://www.voxgratia.org/docs/external_rtp.html (its from 2004 but still current) Simon From: h323plus-bounces(a)lists.packetizer.com [mailto:h323plus-bounces@lists.packetizer.com] On Behalf Of Diego Carvalho Sent: 14 March 2012 03:05 To: h323plus(a)lists.packetizer.com Subject: [h323plus] H323-SIP Gateway with H264 Support Hi all, I'm working on a h323-sip gateway with video (H264) support and I'm facing some problems. I'm new with H323plus and with h323 protocol itself (I'm learning as I go) so excuse me if I say something stupid. First of all, I believe that the stack can be used to build a gateway but it seems that it's more focused on terminals. Am I right? So is it possible or not to build a gateway using it? Second, there is no native support for H264. The documentation shows the class hierarchy. For audio we have, for instance, H323Cabability -> H323RealTimeCapability -> H323AudioCapability -> H323_G711Cabability but we don't have H323Cabability -> H323RealTimeCapability -> H323VideoCapability -> H323_H264Cabability. I tried to create this one, extending from H323Cabability -> H323RealTimeCapability -> H323VideoCapability -> H323GenericVideoCabability and then I discovered that I would need to override a function called CreateCodec to return a codec that handles the video. But I don't want to handle the RTP media. I just want to put H264 in the terminal capability set and establish a connection in a way that the H323 and SIP terminals can exchange the media directly. I've heard about a H264 plugin but it seems that it is for handling the media, so I don't know if it fits my purpose. How can I achieve this? Is there any plan to support H264 natively on H323plus? Also I need to get the remote RTP port. The only way I found to do this is trough H323Connection::OnStartLocicalChannel but this is called after a channel to handle the data is created and again, I don't want to handle the RTP data. I appreciate any help. Thanks.

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Re: [h323plus] H323-SIP Gateway with H264 Support
by Diego Carvalho 30 Apr '12

30 Apr '12

No, it is part of a system that the company I work for is developing. But I'm available to help anyone with the knowledge I'm getting here and while I'm developing it. Best regards, 2012/4/30 Jan Willamowius <jan(a)willamowius.de> > Hi Diego, > > a H.323-SIP gateway with video support sounds very promising. > Do you plan to release it OpenSource ? If you need someone to test it, > feel free to send it my way. ;-) > > Cheers, > Jan > > -- > Jan Willamowius, Founder of the GNU Gatekeeper Project > EMail : jan(a)willamowius.de > Website: http://www.gnugk.org > Support: http://www.willamowius.com/gnugk-support.html > > > Diego Carvalho wrote: > > Hi Simon, > > I am very grateful for the version of the H264 plugin with the > _SGINAL_ONLY > > option. After using it I finally could make video work on my application. > > Now I have 2 more challenges: > > 1 - Link the H264 and G722 plugins statically. How can I do this? > > 2 - I still have problems with capability negotiation. You said me to > > override H323Connection::OnSetLocalCapabilities to remove the codecs that > > SIP doesn't support. But this function is called in the very beginning > of a > > call, when I don't have SIP info yet. So I answer the call with > > H323Connection::AnswerCallPending and then start the SIP call. So I will > > have the SIP info only before sending the Connect PDU (e.g before calling > > H323Connection::AnswerCallNow). Is there another way to modify the local > > capabilities with this constraint? > > I appreciate any help. Thanks in advance. > > > > 2012/4/10 Simon Horne <s.horne(a)packetizer.com> > > > > > Diego**** > > > > > > ** ** > > > > > > Today I checked into the CVS a compile directive _*SIGNAL*_ONLY which > > > will compile the plugin without dependencies on FFMPEG or X264. You > only > > > need h264-x264.h/.cxx. You can use this in conjunction with > _*STATIC*_LINK > > > to build a static library to statically link the codec into the > h323plus > > > library.**** > > > > > > > > > > http://h323plus.cvs.sourceforge.net/viewvc/h323plus/h323plus/plugins/video/… > > > **** > > > > > > You will need to configure the makefile.in with these switches (not > done > > > yet)**** > > > > > > ** ** > > > > > > Also G.722 has serious interop issues. Mainly due to IMHO an error in > the > > > RFC. Although the codec is a 16k codec the RTP timestamps are > incremented > > > as 8k in the RFC. On the H.323 side they almost always use a 16k > timestamp > > > while on the SIP side it’s mostly 8k. **** > > > > > > ** ** > > > > > > Simon**** > > > > > > ** ** > > > > > > *From:* h323plus-bounces(a)lists.packetizer.com [mailto: > > > h323plus-bounces(a)lists.packetizer.com] *On Behalf Of *Diego Carvalho > > > *Sent:* 10 April 2012 04:41 > > > > > > *To:* h323plus(a)lists.packetizer.com > > > *Subject:* Re: [h323plus] H323-SIP Gateway with H264 Support**** > > > > > > ** ** > > > > > > Hi Simon, thanks a lot for you help, but I will have to bother you > again. > > > Now I could compile the H264 plugin after remove the code you told me > but I > > > couldn't make my program load it. I tried 3 different things: first I > put > > > the .so and the help in the same folder as my app, second I tried to > > > install the plugins in the default folder > (/usr/local/lib/opal-1.24.0/) and > > > finally I tried to set PWLIBPLUGINDIR. None of these worked. I also > tried > > > to load the G722 plugin and at least this one should work because I > didn't > > > change it. Am I missing something? > > > I also tried to enable the stack's log. At first glance, it didn't show > > > anything about plugins. Then I used the following code, from Simple > app: > > > > > > PDirectory DefaultDir = PProcess::Current().GetFile().GetDirectory(); > > > PPluginManager & pluginMgr = PPluginManager::GetPluginManager(); > > > pluginMgr.LoadPluginDirectory(DefaultDir); > > > > > > This makes the app loads the plugins from the current directory. After > > > this the log shows: > > > > > > 2012/04/09 11:08:17.701 4 pluginmgr.cxx(96) PLUGIN > > > Enumerating plugin directory /home/diego/H323Gateway/bin/Debug/ > > > 2012/04/09 11:08:17.701 5 pluginmgr.cxx(106) PLUGIN > > > Checking /home/diego/H323Gateway/bin/Debug/g722_audio_pwplugin.so > against > > > suffix _ptplugin > > > 2012/04/09 11:08:17.701 5 pluginmgr.cxx(106) PLUGIN > > > Checking /home/diego/H323Gateway/bin/Debug/g722_audio_pwplugin.so > against > > > suffix _pwplugin > > > 2012/04/09 11:08:17.702 3 h323pluginmgr.cxx(2529) H323PLUGIN > > > Loading plugin codec g722_audio_pwplugin > > > 2012/04/09 11:08:17.702 5 pluginmgr.cxx(106) PLUGIN > > > Checking /home/diego/H323Gateway/bin/Debug/h264_video_pwplugin_helper > > > against suffix _ptplugin > > > 2012/04/09 11:08:17.702 5 pluginmgr.cxx(106) PLUGIN > > > Checking /home/diego/H323Gateway/bin/Debug/h264_video_pwplugin_helper > > > against suffix _pwplugin > > > 2012/04/09 11:08:17.702 5 pluginmgr.cxx(106) PLUGIN > > > Checking /home/diego/H323Gateway/bin/Debug/h264_video_pwplugin.so > against > > > suffix _ptplugin > > > 2012/04/09 11:08:17.702 5 pluginmgr.cxx(106) PLUGIN > > > Checking /home/diego/H323Gateway/bin/Debug/h264_video_pwplugin.so > against > > > suffix _pwplugin > > > 2012/04/09 11:08:18.053 3 h323pluginmgr.cxx(2525) H323PLUGIN > > > Plugin Codec DLL h264_video_pwplugin contains no codec definitions > > > 2012/04/09 11:08:18.058 5 pluginmgr.cxx(106) PLUGIN > > > Checking /home/diego/H323Gateway/bin/Debug/H323Gateway against suffix > > > _ptplugin > > > 2012/04/09 11:08:18.058 5 pluginmgr.cxx(106) PLUGIN > > > Checking /home/diego/H323Gateway/bin/Debug/H323Gateway against suffix > > > _pwplugin > > > > > > So it seems that it loaded G722 correctly and encontered an error while > > > loading H264. But when the app starts, there is no G722 on capabilities > > > table. I also tried to use the G722 plugin in the Simple app and got > the > > > same result. The app shows this in its start up: > > > > > > Codecs (in preference order): > > > Table: > > > G.711-ALaw-64k <1> > > > G.711-uLaw-64k <2> > > > UserInput/hookflash <3> > > > UserInput/basicString <4> > > > UserInput/dtmf <5> > > > UserInput/RFC2833 <6> > > > UserInput/Navigation <7> > > > UserInput/Softkey <8> > > > UserInput/PointDevice <9> > > > UserInput/Modal <10> > > > > > > So, no G722. > > > > > > A last thing is how to link the plugins statically. You said something > > > about the CVS. Does it mean that the option to load the plugins > statically > > > is not available in the current version (1.24.0)? > > > Thanks in advance.**** > > > > > > 2012/4/3 Simon Horne <s.horne(a)packetizer.com>**** > > > > > > Diego**** > > > > > > **** > > > > > > There are 2 functions to load the plugin.**** > > > > > > PLUGIN_CODEC_IMPLEMENT(H264) **** > > > > > > PLUGIN_CODEC_DLL_API struct PluginCodec_Definition * > > > PLUGIN_CODEC_GET_CODEC_FN(unsigned * count, unsigned version)**** > > > > > > These are left as they are (including all the macro associated with > them)* > > > *** > > > > > > **** > > > > > > All Encryption/Decryption is handled by the H264Encoder/H264Decoder > > > classes. Simple remove these classes and everything referenced by the > > > classes.**** > > > > > > Where they are instanced.**** > > > > > > static void * create_encoder(const struct PluginCodec_Definition * > > > /*codec*/)**** > > > > > > static void * create_decoder(const struct PluginCodec_Definition * > > > /*codec*/)**** > > > > > > return NULL.**** > > > > > > **** > > > > > > That’s it. It should compile without needing FFMPEG or X264.**** > > > > > > **** > > > > > > Simon**** > > > > > > **** > > > > > > **** > > > > > > *From:* h323plus-bounces(a)lists.packetizer.com [mailto: > > > h323plus-bounces(a)lists.packetizer.com] *On Behalf Of *Diego Carvalho > > > *Sent:* 04 April 2012 03:57**** > > > > > > > > > *To:* h323plus(a)lists.packetizer.com > > > *Subject:* Re: [h323plus] H323-SIP Gateway with H264 Support**** > > > > > > **** > > > > > > Hi Simon. > > > Again, I would like to thank you because you helped me to solve two > > > problems: make SIP and H323 endpoints exchange media directly and set > > > capabilities by call basis. Actually, the code you showed me didn't > work in > > > my tests (remove all capabilities and then add the ones I want) but I > could > > > at least remove the capabilities I don't want. Anyway, now my last big > > > problem is the H264 support. I'm totally lost. You said: "Simply supply > > > the codec definitions and the codec will be available in h323plus. ". > But > > > supply where? I don't know where to define the PluginCodec_Definition > or > > > the other things you mentioned. Since I'm not an expert on H264 (I know > > > enough to make things work, lol) I would like to use what is already > > > done, I mean, is it possible to make some changes in the H264 plugin to > > > make it work only for signaling or I need to make something from the > > > scratch? Regardless the answer, give me some instructions, please. > Thanks > > > in advance.**** > > > > > > 2012/3/27 Simon Horne <s.horne(a)packetizer.com>**** > > > > > > Diego**** > > > > > > **** > > > > > > Sorry for delay in replying**** > > > > > > With Reference to the document you linked to**** > > > > > > The plugin codec exports 2 functions for capability registration**** > > > > > > unsigned int PWLibPlugin_GetAPIVersion()**** > > > > > > PluginCodec_Definition< > http://www.voxgratia.org/docs/codec_plugins.html#PluginCodec_Definition>* > OpalCodecPlugin_GetCodecs(unsigned * count, unsigned version) > > > **** > > > > > > **** > > > > > > The OpalCodecPlugin_GetCodecs function returns all the information you > > > need on the signaling side. Simply supply the codec definitions and the > > > codec will be available in h323plus. **** > > > > > > You DO NOT need to create the Codec Methods which link to > FFMPEG/x264.**** > > > > > > **** > > > > > > For only supplying the codecs you need rather than removing them for > the > > > call. Clone the Capability List then remove all the orginal and add > back > > > the ones you want.**** > > > > > > In your derived **** > > > > > > void H323Connection::OnSetLocalCapabilities()**** > > > > > > **** > > > > > > H323Capabilities * myCapabilities(localCapabilities);**** > > > > > > localCapabilities.RemoveAll();**** > > > > > > **** > > > > > > H323Capability * cap = myCapabilities.FindCapability(“H.264*”);**** > > > > > > If (cap)**** > > > > > > LocalCapabilities.Add(cap);**** > > > > > > **** > > > > > > **** > > > > > > Simon**** > > > > > > **** > > > > > > *From:* Diego Carvalho [mailto:diego.cdomingos2010@gmail.com] > > > *Sent:* 28 March 2012 06:37 > > > *To:* Simon Horne**** > > > > > > > > > *Subject:* [h323plus] H323-SIP Gateway with H264 Support**** > > > > > > **** > > > > > > Hi Simon, thanks for answering again. Today I could establish SIP -> > H323 > > > audio calls. So now I only need to deal with the 2 points below.**** > > > > > > I'm really interested in being able to add H.264 in the capability set > > > without having to link the library with FFMPEG/X264, but I couldn't > > > understand what you explained. I searched on the internet and found > this: > > > http://www.voxgratia.org/docs/codec_plugins.html > > > that I believe is related to what you explained but even with this > page I > > > couldn't realize what I have to do. Is it possible to configure the > plugin > > > that comes with the source in this way? I mean, use the plugin in > > > h323plus/plugin/video/H.264 for only signaling, without have to link > with > > > FFMPEG/X264. > > > Another question is again about the capabilities. You said that I can > > > remove the capabilities that aren't supported by the SIP endpoint. But > this > > > way, I will have to add all possible capabilities to my gateway and > them > > > remove the ones that SIP doesn't support. It would be much easier if my > > > gateway could start without any capabilities and then I add the ones > that > > > SIP supports. Is that possible? If not, I will have to do what you > > > explained but when I will add all the capabilities again to be ready to > > > handle the next call? > > > Again, thanks for all the help. **** > > > > > > **** > > > > > > 2012/3/23 Simon Horne <s.horne(a)packetizer.com>**** > > > > > > Diego**** > > > > > > **** > > > > > > There is some issues with changes in FFMPEG v54 and a number of > function > > > names changed and others were depreciated recommend v52. I am currently > > > working through issues with v54. Again X264 is a moving target but > last I > > > looked it compiled on Linux. On Windows is a whole different story > > > unfortunately.**** > > > > > > **** > > > > > > If you are only using the codec for signaling there should be no need > to > > > link to either FFMPEG or X264 and you can gut the plugins and only > define > > > the PluginCodec_Definitions, Plugin_Codec_Implementation() and > > > PLUGIN_CODEC_GET_CODEC_FN. These are the signaling parts of the codec. > The > > > Encoder/Decoder contexts can be removed. There is some changes in the > CVS > > > to also allow you to load these plugins statically see the > > > openh323buildopt.h.in.**** > > > > > > **** > > > > > > To filter capabilities on a call by call basis you can do this by > > > overriding H323Capabilities::OnSetLocalCapabilities() and use the > > > localCapabilities.Remove() function to remove the capabilities not > used on > > > the SIP side.**** > > > > > > **** > > > > > > Simon**** > > > > > > **** > > > > > > *From:* h323plus-bounces(a)lists.packetizer.com [mailto: > > > h323plus-bounces(a)lists.packetizer.com] *On Behalf Of *Diego Carvalho > > > *Sent:* 23 March 2012 22:44 > > > *To:* h323plus(a)lists.packetizer.com**** > > > > > > > > > *Subject:* Re: [h323plus] H323-SIP Gateway with H264 Support**** > > > > > > **** > > > > > > Hi Simon and "chr_cb". First of all, thanks for your help. Today I was > > > able to establish an audio only call between H323 and SIP using the > gateway > > > I'm developing. This is great but I still have some problems and I > > > appreciate any help on this: > > > 1) Like I said, it was an audio only call. I was able to compile the > > > plugins with the packages from Ubuntu repositories (libx264-dev, > > > libavcodec-dev and libavutil-dev) but my project also uses ffmpeg and > x264 > > > so I would like to compile with the latest source code from git we > use. The > > > config.log shows some errors and on the internet I saw somebody saying > that > > > only a specific version of ffmpeg allows the compilation. Is that > true? If > > > so, what would be the version of ffmpeg and x264 I should use? Again, I > > > would like to reiterate that I only want to have H264 on my > capabilities > > > list (I don't want to capture/render video). Do I indeed need the > plugin? > > > Is there another way? > > > 2) If I set the gateway capabilities in the beginning it works but I > want > > > so set them in a later time. Specifically, I receive the call and send > an > > > invite on hold to SIP. Then it will answer with 200 OK with SDP. In > this > > > moment, when I have the SIP SDP, I want to set the gateway capabilities > > > based on what the SIP side supports. How can I do this? If I try to > add in > > > this moment it simply doesn't add them. > > > Thanks in advance.**** > > > > > > 2012/3/13 Simon Horne <s.horne(a)packetizer.com>**** > > > > > > Diego > > > > > > The plugins load default capability instances into the H323Endpoint. > > > When the H323Connection is created these capabilities are cloned > > > In H323Connection::OnSetLocalCapabilities() > > > Simply remove the unmatched capabilities > > > localCapabilities.Remove("H.264*"); > > > > > > The H323_ExternalRTPChannel does not handle RTP but can be used to not > use > > > the internal RTP system. You can have your own external RTP stack or > not > > > have one at all. > > > You needed to read and populate H245_H2250LogicalChannelParameters in > the > > > send and receive message of the class with those of the SIP Client. > > > > > > I do have serious doubts what you are planning will work not because it > > > can't technically work but because of the differences in H.323 and SIP > with > > > Video. H.323 is very strict on rules while SIP is very loose on > > > interpretations. > > > Here are the problems > > > 1. RTP packetization H.323 says strictly single NAL SIP is undefined 2 > > > options (Single NAL/Fragmented units) . You will get video on the H.323 > > > side > > > just fine but your SIP side with some devices may not be able to > decode. > > > 2. Payload Type for H.264 is specified as being flexible but a lot of > SIP > > > implementations have them fixed (usually 96 or 97) so H.323 requests > 103 > > > SIP always ends 97 no video on the H.323 side. There is no way you > can fix > > > this with signaling as SIP tells the other party what it is going to > send > > > and H.323 tells the party what it wants to receive. You have to proxy > the > > > media to fix the payload type number. > > > > > > Good luck. > > > > > > Simon > > > > > > > > > > ============================================================================ > > > ============================================= > > > > > > From: Diego Carvalho [mailto:diego.cdomingos2010@gmail.com] > > > Sent: 14 March 2012 06:09 > > > To: Simon Horne > > > Subject: Re: [h323plus] H323-SIP Gateway with H264 Support**** > > > > > > > > > Hi Simon, thanks for answering but I still have some doubts: > > > You said that this plugin will add the capability automatically. > Actually, > > > as I said, I'm building a H323-SIP gateway so, for instance, when the > SIP > > > endpoint is making a call I want to add the H264 capability only if > the SIP > > > endpoint offers it. Will I be able to add the capability manually? For > > > instance, using localCapabilities.Add(new H323_H264Capability()). To > > > sumarize, I want to be able to add (or remove if it was automatically > added > > > and the current call does not offer it) manualy the H264 capability. > > > Also I don't know if the H323_ExternalRTPChannel applies to my > situation. > > > It's used to pass the RTP to another device. I don't want to handle > the RTP > > > at all (to be clear: I don't want RTP arriving on the gateway's network > > > card). I want to send to h323 the RTP address/port SIP offered and > > > vice-versa, so the RTP will flow directly between the endpoints. Any > > > thoughts? Thanks in advance. > > > 2012/3/13 Simon Horne <s.horne(a)packetizer.com> > > > Diego > > > > > > H.264 is a video plugin in the plugin/video directory. You will need > X264 > > > and FFMPEG. For Ubuntu they are libx264-dev libavcodec-dev and > > > libavutil-dev. > > > > > > You build the plugin .so and the helper (in the gpl subdirectory) and > place > > > them both in the same directory as you app. The application will load > them > > > at startup and automatically add the capability to the capabilityset > etc > > > > > > If you don’t want to use the plugin for RTP then have a look at the > > > H323_ExternalRTPChannel. This will bypass the RTP handling in the > codec to > > > whatever you want. > > > http://www.voxgratia.org/docs/external_rtp.html > > > (its from 2004 but still current) > > > > > > Simon > > > > > > > > > From: h323plus-bounces(a)lists.packetizer.com > > > [mailto:h323plus-bounces@lists.packetizer.com] On Behalf Of Diego > Carvalho > > > Sent: 14 March 2012 03:05 > > > To: h323plus(a)lists.packetizer.com > > > Subject: [h323plus] H323-SIP Gateway with H264 Support > > > > > > Hi all, > > > I'm working on a h323-sip gateway with video (H264) support and I'm > facing > > > some problems. I'm new with H323plus and with h323 protocol itself (I'm > > > learning as I go) so excuse me if I say something stupid. > > > First of all, I believe that the stack can be used to build a gateway > but > > > it > > > seems that it's more focused on terminals. Am I right? So is it > possible or > > > not to build a gateway using it? > > > Second, there is no native support for H264. The documentation shows > the > > > class hierarchy. For audio we have, for instance, H323Cabability -> > > > H323RealTimeCapability -> H323AudioCapability -> H323_G711Cabability > but we > > > don't have H323Cabability -> H323RealTimeCapability -> > H323VideoCapability > > > -> H323_H264Cabability. I tried to create this one, extending from > > > H323Cabability -> H323RealTimeCapability -> H323VideoCapability -> > > > H323GenericVideoCabability and then I discovered that I would need to > > > override a function called CreateCodec to return a codec that handles > the > > > video. But I don't want to handle the RTP media. I just want to put > H264 in > > > the terminal capability set and establish a connection in a way that > the > > > H323 and SIP terminals can exchange the media directly. I've heard > about a > > > H264 plugin but it seems that it is for handling the media, so I don't > know > > > if it fits my purpose. How can I achieve this? Is there any plan to > support > > > H264 natively on H323plus? Also I need to get the remote RTP port. The > only > > > way I found to do this is trough H323Connection::OnStartLocicalChannel > but > > > this is called after a channel to handle the data is created and > again, I > > > don't want to handle the RTP data. I appreciate any help. Thanks.**** > > > > > > **** > > > > > > **** > > > > > > **** > > > > > > **** > > > > > > ** ** > > > > >

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