This bug was fixed in the package alsa-plugins - 1.0.25-1ubuntu2
---
alsa-plugins (1.0.25-1ubuntu2) quantal; urgency=low
[ Mike Mestnik ]
* Add build depend on libavcodec-dev and libavutil-dev
* Split the a52 plugin out to it's own package. (LP: #197957)
[ Luke Yelavich ]
I redefined the patch as not being a patch just to get it out of the
sponsoring queue - while it is in fact a patch, it does not create a
libasound2-plugins-extra package as the header suggests (i e, wrong
solution to the bug).
I'm also wondering about whether this leads to any new Main Inclusion
Thank you for taking a look at this :)
I'm with you on the... This is Dolby Digital Surround Sound(TM) and as
such it is protected under some form of patent and is controlled under
the law.
Never the less, libav(the source package for the build depends,
libavcodec-dev) has been uploaded to main
On Di, Jun 19, 2012 at 21:01:16 (CEST), Mike Mestnik wrote:
Never the less, libav(the source package for the build depends,
libavcodec-dev) has been uploaded to main so no-other packaging is
required.
FTR, while the libav source package is in 'main', its 'libavcodec53'
binary package is banned
Ahh, I'm a Debian guy so forgive my ignorance on the Ubuntu details.
How does one specify I'm banned from the live cds.? That wasn't vary
hard.
https://launchpad.net/~cheako/+archive/buildingrounds/+sourcepub/2519104/+listing-archive-extra
The previous patch, plus:
One question, where is maemo? In that what's it's status, what does it
need?
I don't understand any of it, but I think this link may be relevant:
http://www.gossamer-threads.com/lists/maemo/developers/40692
This may make the ALSA maemo plugin obsolete, in favor of kernel
drivers.
...Is this
** Patch added: Add devel packaged requierd for Dolby Sorround and place a52
related files into extra pacakge.
https://bugs.launchpad.net/ubuntu/+source/alsa-plugins/+bug/197957/+attachment/3196973/+files/Build-a52-libavcodec-into-extra-197957.patch
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This contains the authors original release statement.
http://forum.xbmc.org/showthread.php?tid=48441
Near the end of this thread it's clear that the code was pulled from
xbmc and it doesn't really say why, other then the usual channel
mapping issue. Many programs don't use the same 5.1 channel
Kip,
libaften is not JUST a derivative. For example it's thread-safe, but more
importantly uses multiple threads offering drastically improved latency...
Important for ALSA plugins. Using the most developed and advanced encoder
should be a priority.
It may be good enough to offer support
Hey Mike. Ah I see. Thread safety is very important, especially when
used in a game engine. I'll take a good look at libaften and may end up
adding it as a dependency for a large project I am working on.
As for a52plug, I still don't understand what it is. I can't find a
comprehensive and
I can't find any information on a52plug. The link to its google project
site is dead. libaften is just a raw A52 encoder. It isn't intended to
be part of an audio rendering interface, like ALSA, Pulse, DirectSound,
etc.. It's platform agnostic. It uses a patched version of the encoder
that was
Kip,
I haven't looked at the diff in the xbmc bug, but I believe all the code for an
ALSA plugin can be found there. I've found several descriptions of a52plug, so
I think instead of what you mean where. I've got to run to a Funeral, but in
the mean time someone should email the XBMC project
Mike,
The patch for XBMC uses libaften. libaften is just a derivative of the original
a52 ALSA plugin that ALSA's source distribution already ships with, but with
the audio renderer backend agnostic (no ALSA output). So I don't think it makes
sense to say that the ALSA project skipped over it
libafton is to a52plug as ffmpeg and now libav is to a52. a52plug and
a52 are ALSA plugins while libafton and libav are back-end encoders.
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https://bugs.launchpad.net/bugs/197957
Title:
** Patch added: Add devel packaged requierd for Dolby Sorround.
https://bugs.launchpad.net/ubuntu/+source/alsa-plugins/+bug/197957/+attachment/3183876/+files/Build-a52-libavcodec-197957.patch
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Mike, came across this today , courtesy of Klaus Schnass
d...@stuffit.at:
http://aften.sourceforge.net/
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https://bugs.launchpad.net/bugs/197957
Title:
Include a
http://www.ohloh.net/p/a52plug --- Totally cool!
I'll try it out.
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https://bugs.launchpad.net/bugs/197957
Title:
Include a libasound2-plugins-extra package for a52, maemo
To manage
AFAICT the only place to get a52plug is in
http://trac.xbmc.org/ticket/6499
** Bug watch added: trac.xbmc.org/ #6499
http://trac.xbmc.org/ticket/6499
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I don't understand how a52plug and libaften are different.
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https://bugs.launchpad.net/bugs/197957
Title:
Include a libasound2-plugins-extra package for a52, maemo
To manage
Confirmed:
First of all the current alsa-plugins package already has:
/usr/share/doc/libasound2-plugins/a52.txt
/usr/share/doc/libasound2-plugins/examples/a52.conf_pulse
This slightly modified package contains the a52 module.
If you have hardware that supports HDMI (both your computer and your
receiver), you can use HDMI to transport uncompressed multi-channel
audio (up to 6-8 channels) and don't need the a52 plugin. Of course, if
you are stuck to older hardware without HDMI, that's no solution, but I
guess a lot of
Kip,
A Dolby Digital encoder license can be purchased. IMHO this is one advantage
Ubuntu has over Debian.
Philipp,
Hmm, I was unaware that HDMI supported any thing other then Stereo PCM.
Never the less the features you speak of are options AND more importantly ALSA
dosn't seam to have an
Mike,
HDMI really supports multi-channel PCM. I am not sure, though, if all receivers
support it, and if the Linux drivers of all video card brands support it. I
have a Denon receiver and an Intel IGP, and it works nicely out-of-the-box
under Ubuntu since 11.10. I just need to select the
LPCM != PCM. I can't find the bandwidth for HDMI sound, but I can't
imagine it's big enough to carry multichannel uncompressed audio at a
descent rate and precision.
References would be nice, I'm working mainly off Wikipedia and various
links found with Google.
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Plus spdif can also carry LPCM and multichannel LPCM, so this isn't an
issue of switching from one to the other... It's just a matter of
having hardware that supports these optional features of the
specification.
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Mike, it's not a technical problem, it's a legal / moral / philosophical
one. The ALSA plugin is just a wrapper for liba52, which is in turn just
a wrapper for ffmpeg, specifically libavcodec. The latter has to be
built with a52 support at configure time before it is compiled. This is
disabled by
Kip,
I agree it's a matter of philosophy that creates the legal / moral problems,
much like Christianity creates a Virgin Marry. I'm not saying that either of
these beliefs is wrong or incorrect in any way, in fact I understand how futile
an effort that would be.
What I'm saying is that
My apologies, LPCM is similar to PCM. I had just assumed that
Quantization was something vary special having to do with audio
compression. Quantization is, from what I can understand, the process
of both sampling and then averaging, approximating, an analog wave
from(in some cases).
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Hey Mike,
I'm not saying I agree or disagree with the package maintainer's views,
just that that's why a52 support isn't enabled by default. The
technology is there, it's just not enabled. That wasn't my decision and
Ubuntu probably will not deviate from Debian's packaging guidelines in
this
You have to understand that ffmpeg has always been steeped in
controversy. Although the decision might seem straightforward to you,
you aren't the principle financial stake holder in the decision.
Canonical could end up facing a lawsuit. Companies like Dolby typically
have teams of lawyers who
Kip,
I just went to re-compile my setup, because I don't remember when I
originally rebuilt a52. I won't need to build ffmpeg(libav)...
As Ubuntu currently ships the necessary ac3_fixed encoder!
I belive all that's needed is for this package to make use of it... and
that's not against any
https://launchpad.net/~cheako/+archive/buildingrounds/+sourcepub/2494648
/+listing-archive-extra
It would have been impossible for me to setup a stable build
environment. Lucky I setup a PPA just for that purpose, no one _should_
be using buildingrounds.
In a little over 4 hours we will see how
Mike,
ac3_fixed is just the fixed point implementation within libavcodec.
'avconv -formats E' will show the list of current codecs with encoder
support. You'll see it is there, but I am guessing this is accidental
since it is being built implicitly based on the parameters to configure
in
It's situations like this when you realize it's not sufficient to use a
version number to indicate the availability of a feature... as in
libavutil-dev (= 4:0.8.1-0ubuntu1)
Though that's another issue.
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I just helped two ppl on IRC configure surround sound and they both
needed to compile a52.
This is going to become more and more important, why wait?
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Hey Mike. See comment #14.
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https://bugs.launchpad.net/bugs/197957
Title:
Include a libasound2-plugins-extra package for a52, maemo
To manage notifications about this bug go to:
Could this possible exist in a PPA somewhere?
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https://bugs.launchpad.net/bugs/197957
Title:
Include a libasound2-plugins-extra package for a52, maemo
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Since libavcodec-dev is in maverick, can it be added to the build-deps
to enable the a52 plugin?
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https://bugs.launchpad.net/bugs/197957
Title:
Include a libasound2-plugins-extra
** Also affects: alsa-plugins (Ubuntu Lucid)
Importance: Wishlist
Status: New
** Changed in: alsa-plugins (Ubuntu Lucid)
Status: New = Won't Fix
** Changed in: alsa-plugins (Ubuntu)
Status: New = Confirmed
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Include a libasound2-plugins-extra package for a52, maemo
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