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halfgaar
l33t
Joined: 22 Feb 2004
Posts: 781
Location: Netherlands
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 Posted: Sat Jun 26, 2004 8:41 pm Post subject: Alsa routing of center of LFE |
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To my suprise, I noticed that when mplayer gets the order to play in surround sound, it actually plays in surround sound. I thought I was never gonna get anything more than a mirror of the frontspeakers out of my rear speakers in Linux  . Anyway, I do have problem.
I need the front and subwoofer channels mixed in front left and front right, because I have a 4.0 setup and my frontspeakers can act as decent subwoofers. When mplayer is ordered to play into 4 channels, it routes the center to front, but ignores the LFE (subwoofer). When ordered to play in 6 channels, the center and LFE are both ignored. Now, I can fix mplayer to properly route the LFE channel, but a better setup would be to have ALSA route the center and LFE the way I want, so that all apps which use 6 channel setup have proper sound. As I understand it, this can be done by modifing asound.conf, by adding routes. The problem is, I'm completely confused how to go about this.
I need the following: mix 50% of center in left and 50% of center in right. The same goes for the LFE channel. How do I modify the asound.conf for this? This is my surround51 configpart (as assume it should be added here):
| Code: |
EMU10K1.pcm.surround51.0 {
@args [ CARD ]
@args.CARD {
type string
}
type multi
slaves [
{
pcm {
@func concat
strings [
"cards.EMU10K1.pcm.front.0:CARD=" $CARD
]
}
channels 2
}
{
pcm {
@func concat
strings [
"cards.EMU10K1.pcm.rear.0:CARD=" $CARD
]
}
channels 2
}
{
pcm {
@func concat
strings [
"cards.EMU10K1.pcm.center_lfe.0:CARD=" $CARD
]
}
channels 2
}
]
bindings [
{ slave 0 channel 0 }
{ slave 0 channel 1 }
{ slave 1 channel 0 }
{ slave 1 channel 1 }
{ slave 2 channel 0 }
{ slave 2 channel 1 }
]
type route
}
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halfgaar
l33t
Joined: 22 Feb 2004
Posts: 781
Location: Netherlands
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| Posted: Sat Jun 26, 2004 10:43 pm Post subject: |
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I'm almost there. There was a big error in my configuration. My /etc/asound.conf was the same as /usr/share/alsa/cards/EMU10k1.conf, which was useless. My asound.conf is now like this:
| Code: |
pcm.surround6 {
type route
slave.pcm surround51
ttable.0.0 1
ttable.1.1 1
ttable.2.2 1
ttable.3.3 1
ttable.4.0 0.5
ttable.4.1 0.5
ttable.5.0 0.5
ttable.5.1 0.5
}
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When I start mplayer with "mplayer -ao alsa1x:surround6 filewithac3stream.avi" it works perfectly. But, this still requires special application setup. Is there a way to call pcm.surround6 pcm.surround51, without causing a conflict (it can't be called pcm.surround51 because it already exists)? |
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