Hi,
I make others tests. If I remove my custom .asoundrc file :
speaker-test -Dplug:surround51 -c6 -t wav
=> All channels are OK
aplay -Dplug:surround51 Front_Left.wav
"Front Left" OK
"Front Center" on Side Left speaker
"Front Right" OK
"Side Left" on Front Center speaker
"Side Right" on LFE speaker
"LFE" on Side Right speaker
How to explain this difference between speaker-test and aplay even if I
use the same device "plug:surround51" ?
Regards
> Hi,
>
> I detected a problem when I play a 5.1 audio file with some applications
> (like VLC)
> My audio card is "maudio revolution 7.1" connected to a "5.1 sound kit"
>
> In my first test, "speaker-test -c 6 -l 1 -t wav" command, I hear only 2
> channels (Side Left and Side Right).
> So, I created a .asoundrc file with these lines (I found these
> informations on alsa wiki):
> pcm.!default {
> type plug
> slave ice1724_S32_LE;
> }
>
> pcm.duplicate {
> type plug
> slave.pcm "surround51"
> slave.channels 6
> route_policy duplicate
> }
>
> pcm_slave.ice1724_S32_LE {
> pcm surround51;
> format S32_LE;
> }
>
> I test "speaker-test -c 6 -l 1 -t wav" command. I hear all channels in
> right speakers ("Side Left" on my side left speaker, etc ...)
>
> Now I test a 5.1 audio file with VLC. I hear this :
> "Front Left" --> OK (Front Left speaker)
> "Front Right" --> OK (Front Right speaker)
> "Center" --> Side Left speaker
> "Side Right" --> LFE speaker
> "Side Left" --> Center speaker
> "LFE" --> Side Right speaker
>
> So I created a new topic on VLC forum
> (http://forum.videolan.org/viewtopic.php?f=13&t=96023) due to know if this
> problem comes from VLC or alsa.
>
> A VLC developper answer me : "VLC and the ALSA device disagree on the
> channel mapping. I am not sure what the official ALSA order is."
>
> Can you help me ?
>
> Regards,
>
> Aurelien
>
>
>
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