Re: [Alsa-user] Independent Simultaneous playback over 5 channels
Allen Kennedy wrote:
On 10/25/07, Clemens Ladisch [EMAIL PROTECTED] wrote:
Try this:
pcm.channel {
@args [ CHANNEL ]
@args.CHANNEL {
type integer
}
type plug
slave.pcm {
type dshare
ipc_key 220057 # some random but unique number
slave.pcm hw:0# the output device
slave.channels 6
bindings {
0 $CHANNEL
}
}
}
...
One issue though, it appears as though your solution would only
route a single channel of the input wave file.
The plug plugin should automatically downmix multichannel data before
sending it to the dshare plugin.
What is the output of aplay -v -D channel:0 somestereo.wav?
slave.pcm channel: +$CHANNEL # can't figure out how to concat
That line would have to be written like this:
slave.pcm { @func concat strings [ channel: $CHANNEL ] }
Regards,
Clemens
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Re: [Alsa-user] Independent Simultaneous playback over 5 channels
Allen Kennedy wrote:
I'm trying to get an asound.conf file set up that will allow me
to play 5 different wav files over separate channels
simultaneously, with a command like this:
#aplay -D channel1 1.wav aplay -D channel2 2.wav
aplay -D channel3 3.wav aplay -D channel4 4.wav
aplay -D channel5 5.wav
Try this:
pcm.channel {
@args [ CHANNEL ]
@args.CHANNEL {
type integer
}
type plug
slave.pcm {
type dshare
ipc_key 220057 # some random but unique number
slave.pcm hw:0# the output device
slave.channels 6
bindings {
0 $CHANNEL
}
}
}
Then you can use devices channel:0 through channel:5.
HTH
Clemens
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Re: [Alsa-user] Independent Simultaneous playback over 5 channels
On 10/25/07, Clemens Ladisch [EMAIL PROTECTED] wrote:
Allen Kennedy wrote:
I'm trying to get an asound.conf file set up that will allow me
to play 5 different wav files over separate channels
simultaneously, with a command like this:
#aplay -D channel1 1.wav aplay -D channel2 2.wav
aplay -D channel3 3.wav aplay -D channel4 4.wav
aplay -D channel5 5.wav
Try this:
pcm.channel {
@args [ CHANNEL ]
@args.CHANNEL {
type integer
}
type plug
slave.pcm {
type dshare
ipc_key 220057 # some random but unique number
slave.pcm hw:0# the output device
slave.channels 6
bindings {
0 $CHANNEL
}
}
}
Then you can use devices channel:0 through channel:5.
HTH
Clemens
I had just gotten it to work using a dmix when your e-mail came in.
I like your way better, much cleaner and more elegant. Thanks
One issue though, it appears as though your solution would only
route a single channel of the input wave file. adding in more bindings
still only caused it to route 1 channel of the input audio.
I guess I still need a route to get all the channels of the .wav to
funnel together into the output channel.
instead of writing 5 sepereate routes, I tried to use the args,
but couldn't get the syntax correct, any ideas?
It's unfortunate that the alsa documentation doesn't explain well
the syntax for the config files..
pcm.ch {
@args [ CHANNEL ]
@args.CHANNEL {
type string
}
type route
slave.pcm channel: +$CHANNEL # can't figure out how to concat
ttable.0.0 1
ttable.1.0 1
ttable.2.0 1
ttable.3.0 1
ttable.4.0 1
ttable.5.0 1
}
I keep getting an error from aplay about the config syntax.
I tried reading through the code to see how the parse works,
but I gave up after 20 minutes.
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[Alsa-user] Independent Simultaneous playback over 5 channels
Hello,
I'm trying to get an asound.conf file set up that will allow me
to play 5 different wav files over separate channels
simultaneously, with a command like this:
#aplay -D channel1 1.wav aplay -D channel2 2.wav
aplay -D channel3 3.wav aplay -D channel4 4.wav
aplay -D channel5 5.wav
My first attempt was a file full of these:
...snip...
pcm.channel3
{
type route
slave.pcm default
slave.channels 6
#map all output sound strictly to channel 2
ttable.0.2 1
ttable.1.2 1
ttable.2.2 1
ttable.3.2 1
ttable.4.2 1
ttable.5.2 1
}
... snip ...
but this only works for channels 1 and 2
doing an aplay -v -D channel1 1.wav, I see why,
my stream gets routed through a 2 channel plug conversion:
(edited for brevity)
Route conversion PCM
Transformation table:
0 - none
1 - none
2 - 0 + 1 + 2 + 3 + 4 + 5
Its setup is:
channels : 1
rate : 16000
Slave: Plug PCM: Route conversion PCM (sformat=U8)
Transformation table:
0 - 0
1 - 1
Its setup is:
channels : 6
rate : 16000
Slave: Rate conversion PCM (48000, sformat=S16_LE)
Its setup is:
channels : 2
rate : 16000
Slave: Direct Stream Mixing PCM
Its setup is:
channels : 2
rate : 48000
Hardware PCM card 0 'Intel 82801DB-ICH4' device 0 subdevice 0
Its setup is:
channels : 2
How can I route directly to the Slave: Rate conversion PCM (48000,
sformat=S16_LE)?
bypassing that 6 - 2 channel conversion.
or conversely how do I tell the plug to keep all 6 channels?
also my alsamixer is set to do no down converting,
and I do have output from a 6 channel test wave file
played through -D surround51 and
Speaker-test will only give me sound on all 6 channels
IF I specify -c 6 -D surround51 with no -D
it indicates it plays to all the channels, but I only
get sound out of channels 0 and 1.
I've also tried creating custom mixer setups, and
custom rate converters, dshare's and shares.
I'm at a total loss.
thanks,
-Allen
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