[h323plus] How to add a generic Video Capability?

Robert Jongbloed robert.jongbloed at bigpond.com
Thu Jan 17 17:01:24 EST 2008

Yes, it should be a Generic capability as per H.245 Annex E.


Last time I looked the MPEG4 plug-in did not support H.323 at all. I will
talk to some others about adding the correct code.


Robert Jongbloed

OPAL/OpenH323 Architect and Co-founder.


From: h323plus-bounces at lists.packetizer.com
[mailto:h323plus-bounces at lists.packetizer.com] On Behalf Of Abhishek Rohilla
Sent: Thursday, 17 January 2008 8:42 PM
To: h323plus at lists.packetizer.com
Subject: [h323plus] How to add a generic Video Capability?



I have been able to build mpeg4 plugin code taken from opal cvs. Its
PluginCodec Definition has defined it as type
I have changed it to PluginCodec_H323Codec_generic and compiled it. 

Should mpeg4 capability be added as generic or non-standard? What is the
difference between two?

 My application is loading the dll perfectly fine now but the capabilities
are not being added because of the following reasons: 

1.) Generic and non-standard video capabilties require
h323CapabilityData(last member in PluginCodec_Definition) to point to
generic capability data info. This has not been defined in  opal plugin

2.) H323Capability *CreateGenericVideoCap() is checking for
PluginCodec_H323GenericCodecData in PluginCodec_Definition and it is null
currently ,so capability is not created 

Can someone help me in how to define generic capability data and what all
information it needs? I have recognized the structures in opalplugins.h but
don't know how to fill them with suitable values for mpeg4 plugin. 

Please help


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