Complete overhaul of the codec handling code:
*) obsolete flags `asymmetric codecs`, `symmetric codecs`, `reorder
codecs`
*) support proper codec offer/answer
*) split codec manipulation (strip/offer/accept/etc) into separate
functions for clarity and better code maintenance
*) fully update codec handlers in both directions after an answer
*) explicit allocation and handling of codecs and payload types in a
codec_store object
*) improve codec matchup logic during answer
*) more explicit handling of supplemental codecs (CN/DTMF)
*) remove now obsolete hacks for handling certain use cases
Change-Id: I996705ba8fe339524c2f70e6bb0fd854f9a1f4fb
Squashed commit of the following:
commit cca40e8e31
Author: Richard Fuchs <rfuchs@sipwise.com>
Date: Thu Feb 12 10:17:51 2015 -0500
support per-payload-type stats in kernel module
commit dcc0dc0002
Author: Richard Fuchs <rfuchs@sipwise.com>
Date: Wed Feb 11 12:14:44 2015 -0500
count unknown rtp type as error
commit 941bde0df5
Author: Richard Fuchs <rfuchs@sipwise.com>
Date: Wed Feb 11 12:01:55 2015 -0500
use the list of rtp formats from the m= line
This avoids dynamically altering the rtpstats hash table and makes
keeping packet stats lock free.
commit 9150fed671
Author: Richard Fuchs <rfuchs@sipwise.com>
Date: Fri Feb 6 15:06:04 2015 -0500
fix and simplify rtpmap hash table
commit 1f73741cbf
Author: Richard Fuchs <rfuchs@sipwise.com>
Date: Fri Feb 6 13:56:07 2015 -0500
MT#9935 understand, learn, remember and report RTP payload types (codecs)
commit b0d690837c
Author: Richard Fuchs <rfuchs@sipwise.com>
Date: Thu Nov 20 13:36:25 2014 -0500
parse a=rtpmap attribute