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

[Marek Wlizło]

Hello!

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)
-{
- LOGDBG(_("%s"), __PRETTY_FUNCTION__);
-
- for (PINDEX i = 0; i < PARRAYSIZE(CodecInfo); i++)
- {
- if (mediaFormat == CodecInfo[i].mediaFormat)
- return i;
- }
- return P_MAX_INDEX;
-}
-
-//------------------------------------------------------------------------------------------------- 

-
-OpalMediaFormat::List MyOpalDevice::GetMediaFormats() const
-{
- LOGDBG(_("%s"), __PRETTY_FUNCTION__);
-
- 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,
Marek



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