[Sumover-tech] Vocoders of interest not in RAT Library

[Douglas Kosovic]

Hi Melbourne,

> Is there any more detailed information for adding the codec to the RAT 
> codec library?
>
> Is it possible to add the codec executable (.exe) code, or does this 
> require the codec source code?

RAT doesn't use a plug-in archetecure for codecs, so you can't just add a 
arbitary binary (e.g. DirectShow) codec without writing some code. Even if 
it was possible to add binary codecs (as with some other applications), the 
RTP stack source code would (still most likely) need to be modified to 
support the G.729D RTP encapsulation.

You might like to look at VLC which supports transcoding and RTP streaming. 
I believe there is a modified version that support G.729A (I know nothing 
about about G.729D), but I can't recall where I heard about it or may be 
confusing it's support with codec.


Cheers,
Doug

> Piers O'Hanlon wrote:
>>
>> On 29/08/2007, *Melbourne Barton* <mbarton at research.telcordia.com
>> <mailto:mbarton at research.telcordia.com>> wrote:
>>
>>     The selected codec I am interested in (e.g., G.729D) _is not _in RAT.
>>     I have the software code for this codec on my Windows machine.
>>     What can I do in this case?
>>
>>
>> You  would need to add the codec  to RAT codec library, including a 
>> suitable RTP encapsulation (see RFC 3351). see the README files in the 
>> RAT directory:
>> https://frostie.cs.ucl.ac.uk/nets/mmedia/browser/rat/trunk/README.files
>>
>> Piers
>>
>>     Melbourne
>>
>>
>>     Piers O'Hanlon wrote:
>>>     Yes RAT can playback and/or record PCM/WAV audio from a file by
>>>     selecting the file small floppy disk icon at the lower left of
>>>     the main window pane. This will be packetised by RAT according to
>>>     the selected codec in RAT.
>>>
>>>     Piers
>>>
>>>     On 28/08/2007, *Melbourne Barton* <
>>>     mbarton at research.telcordia.com
>>>     <mailto:mbarton at research.telcordia.com>> wrote:
>>>
>>>         Hi,
>>>
>>>         I am testing a set of voice codecs that are not in the RAT
>>>         toolkit.
>>>         The codec softwere are installed on my Windows machines
>>>         (voice encoder on one PC, and voice decoder on another PC).
>>>         Input to the encoder are speech files (in .wav or .raw
>>>         format). The digitized output of the encoder is stored in a 
>>> file.
>>>
>>>         Can I use RAT's  RTP/UDP/IP capabilities to transmit the file
>>>         to ther emote Windows PC that has the voice decoder installed,
>>>         to recover the decoded speech.
>>>
>>>         If RAT cannot be used, which other (preferably windows-based)
>>>         tools are out there to build, transmit and recover RTP streams?
>>>
>>>
>>>         Thanks,
>>>
>>>         Melbourne
>>>
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>>>
>>
>>
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>
>