[Pkg-alsa-devel] Bug#503839: /usr/lib/alsa-lib/libasound_module_pcm_vdownmix.so: vdownmix from 5.1 does not incorporate LFE channel

[Josh Triplett]

Package: libasound2-plugins
Version: 1.0.16-1+b1
Severity: normal
File: /usr/lib/alsa-lib/libasound_module_pcm_vdownmix.so

The vdownmix plugin suggests this for .asoundrc:

pcm.!surround51 {
	type vdownmix
	slave.pcm "default"
}

Using that setup and a pair of stereo speakers or headphones, I ran
"speaker-test -D surround51 -c 6 -t wav".  The audio for the front
left, front center, front right, rear left, and rear right speakers
came through just fine (and even sounded spatially correct with
headphones), but the LFE channel (the .1) did not produce any audio.

- Josh

-- System Information:
Debian Release: lenny/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.26-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages libasound2-plugins depends on:
ii  libasound2              1.0.16-2         ALSA library
ii  libavcodec51            0.svn20080206-14 ffmpeg codec library
ii  libc6                   2.7-15           GNU C Library: Shared libraries
ii  libdbus-1-3             1.2.1-4          simple interprocess messaging syst
ii  libjack0                0.109.2-4        JACK Audio Connection Kit (librari
ii  libpulse0               0.9.10-3         PulseAudio client libraries
ii  libsamplerate0          0.1.4-1          audio rate conversion library

libasound2-plugins recommends no packages.

libasound2-plugins suggests no packages.

-- no debconf information