[Asterisk-video] Updated Confiance VideoMixer

[Lorenzo Miniero]

Hi all,

I just prepared a new version of the videomixer with a lot of changes, 
which include many of the suggestions Klaus gave me in his precious 
feedback.


Specifically:

	* now each user has both an encoding and a decoding context; besides, 
each one has a customizable layout (even if at the moment all just 
include the active users);

	* each user has a priority value, where users with higher priority (0 
is the highest value) get wider areas in the mix; the idea is to 
associate such value to roles in a conference (e.g. the lecturer should 
have highest priority, people making questions lower and so on), and to 
have it dynamically change in time (e.g. your priority increases when 
you make questions and decreases otherwise, etc.);

	* to enable/disable each video source, I've added a basic DTMF-based 
command: *28, * for the menu, 2 for the enable/disable trigger, 8 to 
quit the menu (of course the 's' flag must be passed to MeetMe in order 
to DTMFR menus to work); exactly how the Mute/UnMute (*18) already 
works; it only works for normal users, since for Admins that trigger is 
used to lock conferences;

	* since each user has a custom layout, each user can choose if he wants 
to appear in the mix he receives or not; this option too can be 
triggered via DTMF (*38), and as before only for normal users (for 
Admins it is used to eject users);

	* as Klaus asked, I've added some info related to video in 'meetme 
list', specifically the negotiated codec and if the user is an active 
video source or not;

	* the 'videoswitch' command has disappeared; now there's a 'videomixer' 
command, which works this way:

		videoswitch <conf> <user> <command> [value]>

	where command can be:

		- enable/disable (to enable or disable video source)
		- mirror (needs value 0/1, where 1 means the user wants to see himself 
in the mix, default is 0);
		- priority (needs priority value, 0=highest, 8=lowest, default is 2).		

	* to conclude, I've made some bugfixes, introduced some cleaning when 
closing the videomixer, and added a minimum reliability to Asterisk (if 
the mixer shutdowns to restart, Asterisk tries to reconnect 10 times 
before giving up); however, all this probably needs some more work, so 
in case you encounter strange behaviours don't hesitate to report it to me.


If you're interested in trying it, you can get it here:

	http://confiance.sourceforge.net/confiance_videomixer-0.2-beta.tar.gz

In this package you'll find the updated version of the mixer, and the 
modified Asterisk files. So, assuming you already installed the previous 
patched version of Asterisk, just substitute the old files with the one 
attached in the package (from the asterisk-canges folder), and 
recompile/reinstall.

Any kind of feedback will be more than appreciated.

Lorenzo

-- 
Lorenzo Miniero, Junior Researcher
Dipartimento di Informatica e Sistemistica
Università degli Studi di Napoli "Federico II"
Via Claudio 21 -- 80125 Napoli (Italy)
Phone: +390817683821 - Fax: +390817683816
Email: lorenzo.miniero at unina.it