tags 578720 wontfix
thanks
Hi John!
On Thu, 22 Apr 2010 07:44:50 +0100 John Talbut <j...@dpets.co.uk> wrote:
Playing: /data/Sounds/Barbara_Allen.ogg Ogg Vorbis stream: 1 channel,
44100 Hz ALSA snd_pcm_hw_params_set_channels error: Invalid argument
Error: Cannot open device alsa.
The error message here is a bit cryptic. What it tries to say is: Your
output device doesn't support Mono playback and no software in the
output pipeline (that probably looks somewhat like the following in your
case) is willing to do the necessary upmixing:
ogg123 -> libao -> ALSA -> device driver -> hardware
Doing the upmixing in ogg123 is certainly out of its scope and libao
also seems too simple. ALSA has plugins to support upmixing [1] [2]. The
device driver or the hardware are certainly harder to replace. You could
also put a sound server like pulseaudio in the middle, that could do the
upmixing, too.
Alsacap [3] seems like an interesting tool to check, which modes your
current ALSA configuration supports.
Cheers,
Martin
[1]
https://wiki.archlinux.org/index.php/Advanced_Linux_Sound_Architecture#Upmixing
[2] https://packages.debian.org/jessie/libasound2-plugins
[3] http://www.volkerschatz.com/noise/alsa.html#alsacap
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