alsa-plugins a52 module broken with libav

[Rob Hall]

[Impact statement]
Due to changes in the ac3 encoder in libav the a52 alsa-plugin will no longer work in Oneric.

[Development fix] / [Stable fix]
Committed in r59 of http://bazaar.launchpad.net/~ubuntu-audio-dev/alsa-plugins/ubuntu.oneiric/revision/59. Already fixed in r2557 of http://anonscm.debian.org/viewvc/pkg-alsa?view=revision&revision=2557.

[Test case]
speaker-test -Da52 -c6
[ac3 @ 0x1c14000] Specified sample_fmt is not supported.

[Regression potential]
Low - This commit only touches the a52 plugin source, and as it will ship not working, it won't regress further.

[Original defect report]
A patch is available

http://git.alsa-project.org/?p=alsa-plugins.git;a=blobdiff;f=a52/pcm_a52.c;h=76f21cd003bfcfb8c3b07e003f04aca6132a7b79;hp=ed491b31c32a87a65258524b497d05d6e876fc0b;hb=40c129a160f37fe9488b2828d6299f99c269703e;hpb=06ca71522f1dc48b8503d945da81fdbcbab0aafa

[Daniel T Chen (crimsun)]

We actually need to conditionalize upon libav* version, so we need both commits from upstream.

[Martin Pitt (pitti)]

Hello Rob, or anyone else affected,

Accepted alsa-plugins into oneiric-proposed, the package will build now and be available in a few hours. Please test and give feedback here. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you in advance!

[Rob Hall (rhall-lincommander)]

I've upgraded to the proposed package and built the a52 module from the package source without any issues. Thanks for the speedy resolution of this issue.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Daniel T Chen (crimsun)]

This was fixed in the merge for Precise.

[Daniel T Chen (crimsun)]

I confirm that the fix in oneiric-proposed also resolves the reported symptom.

[Launchpad Janitor (janitor)]

This bug was fixed in the package alsa-plugins - 1.0.24-0ubuntu6.1

---------------
alsa-plugins (1.0.24-0ubuntu6.1) oneiric-proposed; urgency=low

  * debian/patches/0006-handle-new-libav.patch: Backport upstream git
    commits 40c129a and 826dafa so that the a52 plugin works again.
    (LP: #872871)
 -- Daniel T Chen <email address hidden> Wed, 12 Oct 2011 11:08:02 -0400