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

From: Simon Brenner
Subject: Re: [Linphone-developers] Linphone and G.722 Wideband codec
Date: Fri, 02 Jul 2010 12:01:19 +0200
User-agent: Thunderbird (X11/20091015)

Wait a minute, I think we also have do differentiate between this as a buit-in 
codec or a plugin
codec, haven't we?
If we have it as a plugin it has to be compiled as a kind of own project which 
results in a .so / .a
library being copied / installed to a possible Linphone plugin folder.
If we have it as a built-in codec there are all those steps to be done that 
you've already named.

So what do we have?


menno wrote:
> Hello Everyone,
> I can't compile it succesfully. I add the c files to the
> mediastreamer2/src/ , but after configure he don't compile the
> all the g722 C files (dont transform them to "lo" & "o" files.
> Is there anybody who can exactly describe the steps what i should doing to
> add this codec to linphone? The steps of mine didn't work yet succesfully
> :(.
>> 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
>> Thanks
>> Vadim
>> 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?
>>> -Simon.
>>>>> 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.
>>>>> -Simon.
>>>>> menno wrote:
>>>>>> Hi!
>>>>>> 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.
>>>>>>> Hi!
>>>>>>> Yeah, that was exactly was I was trying to do 2 months ago
>>>>>>> (coincidentally
>>>>>>> also on an ARM device). I
>>>>>>> also got everything to compile and if I remember it correctly I
> even got
>>>>>>> G.722 to be standing in the
>>>>>>> audio codec list.
>>>>>>> But I unfortunately never got the codec really running which I
> don't understand...
>>>>>>> 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
>>>>>>> USE_G722_CODEC)
>>>>>>> -Simon.
>>>>>>> menno wrote:
>>>>>>>> Hello,
>>>>>>>> I want to use the G.722 codec on a 1.2Ghz ARM Device in the
> future. For
>>>>>>>> now i want to use linphone incombination with the Wideband G.722
> codec.
>>>>>>>> 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
>>>>>>>> g722_decode.c
>>>>>>>> into mediastreamer2/src
>>>>>>>> 3. I put the g722.h file into the
>>>>>>>> mediastreamer2/include/mediastreamer2
>>>>>>>> directory
>>>>>>>> 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
>>>>>>>> "linphone_core_assign_payload_type(&payload_type_g7221,9,NULL);"
>>>>>>>> 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 this
>>>>>>>> to the current linphone)?

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