[Asterisk-Dev] Asterisk Codecs Extension

[Pedro Bessa Goncalves]

Hi Alex, what if the codec I want to add is for video? I noticed H263 is
only available in asterisk/formats/. Does that mean H263 is only being coded
in client side and being passed-through by *?

In that case, if I wanted to support the pass-through of a video stream the
only thing I would have to do would be changing the SIP header to indicate
the new codec name?

 

Thank you,

Pedro

 

  _____  

From: Alex Volkov [mailto:avolkov at bpvn.com] 
Sent: quarta-feira, 14 de Abril de 2004 8:20
To: asterisk-dev at lists.digium.com
Subject: Re: [Asterisk-Dev] Asterisk Codecs Extension

 

Pedro,

 

Simply look at any codec code in asterisk/codecs/. I suggest codec_ulaw.c or
codec_alaw.c. The bulk of both of these is the necessary interfacing code to
make whatever-generic-codec work with asterisk, and the actual conversions
from xlaw to PCM and back are simple 2-liner loops. Once you understand the
basic structure of an * codec, look at codec_g723_1.c for an example on how
to handle a whatever-generic-codec that is an opaque library.

Model your new * codec on those, as I think those provide the best examples
of an adaptation/abstraction layer.

 

Cheers!

Alex.

----- Original Message ----- 

From: Pedro Bessa Goncalves <mailto:est-p-bgoncalves at ptinovacao.pt>  

To: Asterisk-Dev at Lists. Digium. Com
<mailto:Asterisk-Dev at Lists.%20Digium.%20Com%20(asterisk-dev at lists.digium.com
)>  (asterisk-dev at lists.digium.com) 

Sent: Tuesday, April 13, 2004 7:35 AM

Subject: [Asterisk-Dev] Asterisk Codecs Extension

 

Hi, does anyone know the required function headers for extending Asterisk
codecs? 
Is there another way to import 3rd party codecs? 

Thank you, 
Pedro Goncalves 

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