[Bug 58824] New: Replace Celt with Opus

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=58824

          Priority: medium
            Bug ID: 58824
          Assignee: spice-bugs at lists.freedesktop.org
           Summary: Replace Celt with Opus
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: bugs at kerrickstaley.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: protocol
           Product: Spice

Spice depends on Celt 0.5.1, which is very old (0.5.2 came out almost 5 years
ago [1]). Opus [2] is an IETF-standardized codec that supersedes Celt. It's
annoying for package maintainers to support Celt 0.5.1 alongside later versions
of Celt and Opus, and this is helping to prevent Arch Linux from including
Spice in its official repositories [3].

I'm guessing libopus doesn't support Celt 0.5.1's older bitstream format, so
this fix isn't quite trivial: something will have to be done to address older
clients interacting with newer servers and vice versa.

[1] http://www.celt-codec.org/news/
[2] http://opus-codec.org/
[3] https://bugs.archlinux.org/task/23453#comment98942

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