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Re: [Linphone-developers] Linphone and G.722 Wideband codec

From: Vadim Lebedev
Subject: Re: [Linphone-developers] Linphone and G.722 Wideband codec
Date: Thu, 01 Jul 2010 17:07:04 +0200
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20100423 Lightning/1.0b1 Thunderbird/3.0.4

I'm attaching my version of mediastreamer2/plugins/msg722.c

There is two IMPORTANT things to remmeber about g722

1) when building ding SDP the fmt should be G722/8000

2) The actual sampling rate should be 16000HZ  but the RTP timestamp should be based 8000HZ


On 06/29/2010 01:24 PM, Simon Brenner wrote:
The files from the code from the internet are not directly very useful,
because you should make some config&make files.
Yeah, that's right!

Is there anybody who has allready made a G722 plugin (the sama as msilbc
plugin) for Linphone (so that i can compile that first and give some
parameters to the linphone configuration to use them)?
I'm actually in the middle of writing a Linphone plugin, but this is for other reasons. For a start,
I took the msx264 plugin code and replaced it by my own code preserving the needed structure. But I
better had had a kind of template or decent guide to do that.

Perhaps we can ask Simon Morlat how his approach to writing a plugin is?? Simon, do you have some
kind of plugin template?


Well, as I said, I never got the codec actually running.
You seem to have done the same steps as I did in order to integrate that
particular piece of code
from the internet. So I'm not further than you.

But the thing with doing it as a plugin seems very clever to me! I like
the idea of a plugin being
generally independent from the main program.
Before saying any more I'll also have to have a look at some already
existent plugins in order to
understand how they work.


menno wrote:

Nice to hear!

Can you explain the steps that you do to get this G722 working (to get
this in the codec section)? I'll try that first on a normal i386/i686 PC
and after that i will try to recompile it to an ARM device.


Yeah, that was exactly was I was trying to do 2 months ago
also on an ARM device). I
also got everything to compile and if I remember it correctly I even
G.722 to be standing in the
audio codec list.
But I unfortunately never got the codec really running which I don't

I would also definitely be interested in having G.722 integrated in
Linphone - even if it would be
with the help of a preprocessor switch or something. (Like


menno wrote:

I want to use the G.722 codec on a 1.2Ghz ARM Device in the future.
now i want to use linphone incombination with the Wideband G.722

I follow the following steps:
1. I download all the G722 files @
2. I unpack the files and put msg722.c, g722_encode.c and
into mediastreamer2/src
3. I put the g722.h file into the
4. I added two new filter id's to allfilters.h
5. I add all the C-files to the mediastreamer2/src/
6. I add

Compiling works ok with the current version linphone-3.3.1.tar.gz. But
after compiling , and starting program i get no other codecs than the
g711A/U,GSM and not the G722 one.

Can anybody help me to get this G722 wideband codec working (or add
to the current linphone)?
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