Re: [codec] I-D Action: draft-ietf-codec-opus-11.txt

Jean-Marc Valin <jmvalin@mozilla.com> Fri, 17 February 2012 21:35 UTC

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Date: Fri, 17 Feb 2012 16:35:36 -0500
From: Jean-Marc Valin <jmvalin@mozilla.com>
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Subject: Re: [codec] I-D Action: draft-ietf-codec-opus-11.txt
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Hi,

We just uploaded version -11 of the draft to address the comments made
during the second WGLC and during the Taipei meeting. The list of
changes is below:

- Fix for noise floor tracking as discussed in last meeting (see
  issue #1)
- Limit LPC prediction gain as discussed in last meeting (see
  issue #2)
- Fix LPC/LTP state rescaling as discussed in last meeting (see
  issue #3)
- Resampler simplification as discussed in last meeting (see
  issue #4)
- Making it easier for an alternate implementation to pass the
  conformance test as discussed in last meeting
- Editorial/spelling fixes received
- Minor code improvements to facilitate further testing and
  creation of better test vectors
- Addressed some comments about variables using names reserved by
  POSIX (_ prefix) or some ADI compilers (bank)
- Fixes for optional "self-delimited packing"


On 17/02/12 04:25 PM, internet-drafts@ietf.org wrote:
> 
> A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Internet Wideband Audio Codec Working Group of the IETF.
> 
> 	Title           : Definition of the Opus Audio Codec
> 	Author(s)       : Jean-Marc Valin
>                           Koen Vos
>                           Timothy B. Terriberry
> 	Filename        : draft-ietf-codec-opus-11.txt
> 	Pages           : 324
> 	Date            : 2012-02-17
> 
>    This document defines the Opus interactive speech and audio codec.
>    Opus is designed to handle a wide range of interactive audio
>    applications, including Voice over IP, videoconferencing, in-game
>    chat, and even live, distributed music performances.  It scales from
>    low bitrate narrowband speech at 6 kb/s to very high quality stereo
>    music at 510 kb/s.  Opus uses both linear prediction (LP) and the
>    Modified Discrete Cosine Transform (MDCT) to achieve good compression
>    of both speech and music.
> 
> 
> A URL for this Internet-Draft is:
> http://www.ietf.org/internet-drafts/draft-ietf-codec-opus-11.txt
> 
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
> 
> This Internet-Draft can be retrieved at:
> ftp://ftp.ietf.org/internet-drafts/draft-ietf-codec-opus-11.txt
> 
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