[Pkg-alsa-devel] Bug#277542: marked as done (libasound2: better resampling methods for rate plugin)

Thu Oct 21 16:03:22 UTC 2004

Your message dated Thu, 21 Oct 2004 10:49:53 +0200
with message-id <1098348593.3170.38.camel@thanatos>
and subject line Please report this upstream
has caused the attached Bug report to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

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>From ranma@tdiedrich.de Wed Oct 20 12:25:42 2004
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From: Tobias Diedrich <ranma@tdiedrich.de>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: libasound2: better resampling methods for rate plugin
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Date: Wed, 20 Oct 2004 21:25:25 +0200
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Package: libasound2
Version: 1.0.6-3
Severity: wishlist
Tags: upstream

As far as I understand it all resampling in alsa is done by the rate
plugin, which is automatically inserted by "plug" into the processing
chain.  I recently started playing with dmix and noticed audible
resampling artifacts when using it.  Now dmix itself can only be
configured to a fixed rate, so I assume that if the client application
(e.g. mplayer) requests a different rate, rate will be used to resample.

The sourcecode suggests that it is currently implementing only linear
interpolation, but polyphase and bandlimited methods are planned
(Although IMHO the artifacts sound more like nearest neighbour
resampling to me, Maybe because it was downsampling from 48000Hz to
44100Hz.  So it might be sufficient to improve the downsampler).

-- System Information:
Debian Release: 3.1
  APT prefers unstable
  APT policy: (3000, 'unstable')
Architecture: i386 (i686)
Kernel: Linux 2.6.8.1-ruby
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8

Versions of packages libasound2 depends on:
ii  libc6                       2.3.2.ds1-18 GNU C Library: Shared libraries an

-- no debconf information

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>From jdthood@aglu.demon.nl Thu Oct 21 01:54:42 2004
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Subject: Please report this upstream
From: Thomas Hood <jdthood@aglu.demon.nl>
To: 277542-done@bugs.debian.org
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Thanks for your report.  I have no objection to your request; however, I
am closing it because I don't see any need for it to be tracked in the
Debian BTS.  Please report your wish upstream at
https://bugtrack.alsa-project.org/alsa-bug so that you can discuss the
matter directly with the ALSA developers.

-- 
Thomas Hood