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Re: [Linphone-developers] PATCH: LPC10 payload
From: |
Nicholas J Humfrey |
Subject: |
Re: [Linphone-developers] PATCH: LPC10 payload |
Date: |
Mon, 25 Jun 2007 16:09:40 +0100 |
RFC1890 says:
4.4.1 1016 (the now retired AV profile PayloadType 1)
Encoding 1016 is a frame based encoding using code-excited linear
prediction (CELP) and is specified in Federal Standard FED-STD 1016
[2,3,4,5].
The U. S. DoD's Federal-Standard-1016 based 4800 bps code excited
linear prediction voice coder version 3.2 (CELP 3.2) Fortran and C
simulation source codes are available for worldwide distribution at
no charge (on DOS diskettes, but configured to compile on Sun SPARC
stations) from: Bob Fenichel, National Communications System,
Washington, D.C. 20305, phone +1-703-692-2124, fax +1-703-746-4960.
4.4.9 LPC (AV profile PayloadType 7)
LPC designates an experimental linear predictive encoding
contributed
by Ron Frederick, Xerox PARC, which is based on an implementation
written by Ron Zuckerman, Motorola, posted to the Usenet group
comp.dsp on June 26, 1992.
A implementation is available here:
ftp://parcftp.xerox.com/pub/net-research/lpc.tar.Z
I think I was mistaken in calling it LPC10. New patch here:
http://www.ecs.soton.ac.uk/njh/tmp/ortp-lpc.patch
I have been testing interoperability against RAT and QuickTime.
nick.
On 25 Jun 2007, at 15:09, Simon Morlat wrote:
Hi,
Are LPC10 and the lpc1015 really different or are they the same ?
I known RFC3551 refers to a lpc1016...
Simon
Le Wednesday 20 June 2007 17:44:22 Nicholas J Humfrey, vous avez
écrit :
Hi,
Here is a patch against CVS which adds LPC10 payload support (static
payload ID 7).
http://www.ecs.soton.ac.uk/~njh/tmp/ortp-lpc10.patch
nick.
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