[asterisk-dev] AMR support in Asterisk-SVN (codec_amr.so)

[Sergio Garcia Murillo]

From: "Paul Bagyenda" <bagyenda at dsmagic.com>
Sent: Tuesday, March 06, 2007 3:26 AM
Subject: [asterisk-dev] AMR support in Asterisk-SVN (codec_amr.so) 


> Hi,
Hi Paul

>   Also I'd like to solicit views on how to get past one fairly  
> significant issue: Asterisk does not seem to provide a clean way to  
> get access to/provide out-of-band signalling info, such as what one  
> gets via SDP on a SIP channel. For AMR this is important since this  
> information tells us how the client intends to code the AMR packets  
> (see RFC 3267, Sect. 8.1). A first glance seems to suggest we need  
> some major surgery to some key modules to allow this...

I find you work very usefull. 
I'm currently using amr format for h324m content playback, but 
mpeg4ip only support rfc 3267 in octet-aligned mode. 
I have to rebuild the amr stream to pass it to the h324m library so
it would be great if this mode is supported also. I could modify my 
code in order to be able to handle also the bandwith efficient mode,
but we should then signal somehow in which mode is the frame coded.
Perhaps as a quick hack we could get to payload formats for it (and
also two codecs).

The parameter option would be perfect, but i know it's going to hard
to get it done. It would be also very usefull for video, to be able to 
specify codec parameters as bandwith (to be able in the future to
know when we should transcode or not).

Greetings
Sergio Garcia
http://sip.fontventa.com/