[h323plus] How to add for H323EndPoint capability for codec G.729 into h323plus library?

Simon Horne s.horne at packetizer.com
Sat Oct 10 22:46:41 EDT 2009


You should still be able to use the depreciated code from 1.18.0 if you are
upgrading. The capability handling etc has not significantly changed. Simply
move the applicable LID classes from 1.18.0 into you project and compile
against H323plus. 


-----Original Message-----
From: h323plus-bounces at lists.packetizer.com
[mailto:h323plus-bounces at lists.packetizer.com] On Behalf Of Marek Wlizlo
Sent: Sunday, 11 October 2009 11:32 AM
To: h323plus at lists.packetizer.com
Subject: [h323plus] How to add for H323EndPoint capability for codec G.729
into h323plus library?


On the last Friday I decided to upgrade my project's libraries: pwlib 1.10.0
-> 1.12.0 and openh323 1.18.0 -> h323plus 1.19.7.
The project's application is a media-signaling gateway from DSS1 to
H.323 protocol using my hardware with DSP for media converting.

With previous openh323 library I don't have any problems with adding codecs
supported by my DSP to capabilities table - I just simply create object
'mydevice' of class MyOpalDevice : public OpalLineInterfaceDevice and inside
of it just add table 'CodecInfo':

-static struct { const char * mediaFormat; } CodecInfo[] = -{
- { OPAL_G729A },
- { OPAL_G711_ALAW_64K },
- { OPAL_G711_ULAW_64K },
- { OPAL_G729 }

-static PINDEX FindCodec(const OpalMediaFormat & mediaFormat) -{
- for (PINDEX i = 0; i < PARRAYSIZE(CodecInfo); i++)
- {
- if (mediaFormat == CodecInfo[i].mediaFormat)
- return i;
- }
- return P_MAX_INDEX;

-OpalMediaFormat::List MyOpalDevice::GetMediaFormats() const -{
- OpalMediaFormat::List formats;
- for (PINDEX i = 0; i < PARRAYSIZE(CodecInfo); i++)
- {
- formats.Append(new OpalMediaFormat(CodecInfo[i].mediaFormat));
- }
- return formats;

After this it was enough to use static method:
H323_LIDCapability::AddAllCapabilities(&mydevice, capabilities, 0, 0);

during initialization of my endpoint in method:
GatewayEndpoint::Init(bool initial)
(where class GatewayEndpoint : public H323EndPoint).

In h323plus there is not defined class OpalLineInterfaceDevice and for two
days I can't find the way how to use codec's capabilities different than
G.711-ALaw-64k{sw} or G.711-uLaw-64k{sw}. I need to add G.729 and G.729A. I
must mention that I have read documentation from
http://www.voxgratia.org/docs/faq.html#5_1 and there is explained how to use
external plugins with software codecs. In my case I need to put into my
GatewayEndpoint capabilities table information that my DSP just supports
(G.729 and some others).

Please help.

Thanks in advance,

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