[codec] Protocol Action: 'Updates to the Opus Audio Codec' to Proposed Standard (draft-ietf-codec-opus-update-10.txt)
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Date: Mon, 28 Aug 2017 08:03:47 -0700
Subject: [codec] Protocol Action: 'Updates to the Opus Audio Codec' to Proposed Standard (draft-ietf-codec-opus-update-10.txt)
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The IESG has approved the following document: - 'Updates to the Opus Audio Codec' (draft-ietf-codec-opus-update-10.txt) as Proposed Standard This document is the product of the Internet Wideband Audio Codec Working Group. The IESG contact persons are Adam Roach, Alexey Melnikov and Ben Campbell. A URL of this Internet Draft is: https://datatracker.ietf.org/doc/draft-ietf-codec-opus-update/ Technical Summary This document addresses minor issues that were found in the specification of the Opus audio codec in RFC 6716. That RFC normatively specifies the Opus decode in the form of C code attached as appendix A. The updates in this draft are primarily done as a series of small patches to that code. Working Group Summary Jonathan Rosenberg, then WG chair, originally stated that updates to RFC 6716 would be handled via the normal errata process. However, after conferring with our ADs, he and the chairs decided that handling these via a new draft would avoid any questions about overriding WG consensus. That decision was announced by the chairs in 2013 with the first version of the draft. Jonathan Rosenberg voiced his approval of it on the list afterwards, and no one has raised an issue with it since then. The WG held the document open for some time to give people a chance to find new issues, but the rate of new reports has dropped off, and the last issue was reported in October. Thus there is likely not much value in further postponing publication. Document Quality The updates have been implemented in libopus 1.2, released on 20 June 2017. They were available in pre-release versions for testing purposes for nearly a year prior (several years, for some of the changes). Currently they require a special option to enable them at configuration time. The authors expect to remove that option (enabling the updates by default) in a new version of libopus once this document is published as an RFC. Most users of libopus, which includes all of the major browsers, Android, iOS, and many others, will then get the new behavior once they upgrade. The authors of the Opus decoder in FFmpeg, another open source implementation, have also stated their intention to implement the updates in this draft. Mark Harris, Tina le Grand, and Jonathan Lennox all performed detailed reviews. Mark Harris is a long time contributor to the libopus open source project, with a deep familiarity with the codebase and a long track record of finding bugs and issues with new changes to it. Tina le Grand is the primary developer responsible for Opus's integration into WebRTC for Chrome, and Jonathan Lennox is the primary developer responsible for Opus's integration into Vidyo's products. Both have a number of contributions to the open source project and are familiar with the design and implementation of Opus. All three had a number of editorial suggestions, but identified no major issues with any of the proposed fixes. Additional review was performed by Ralph Giles, Michael Graczyk, Ron Lee, Felicia Lim, Gregory Maxwell, and Jan Skoglund. Personnel Document Shepherd: Timothy B. Terriberry Responsible Area Director: Ben Campbell