This create a full duplex device
pcm.!default {
type asym
playback.pcm {
type plug # plug is usefull to adjust rate conversion
slave.pcm "hdaloop_out"
}
capture.pcm {
type plug
slave.pcm "dsnoop:0,0" # dsnoop is used to be able to open
capture device more than once
}
}
This one takes in input a 2 channel stream and create a 4 channel
output stream copying channels
pcm.hdaloop_out {
type route
slave.pcm "multi"
slave.channels 4
ttable.0.0 1
ttable.1.1 1
ttable.0.2 1
ttable.1.3 1
}
This split a 4 channel stream to 2 channels streams and play them
through main sound card and the secondary one.
Anyway this is an example, i don't know you configuration, i supposed
you have hw:0,0 and hw:1,0 but it should be different. aplay -l should
list your devices.
You can try to avoid dmix and use directly hw : slaves.a.pcm
"hw:0,0" # main sound card
Anyway you'll prabably have problem of synchronization.
http://alsa.opensrc.org/index.php/TwoCardsAsOne
bye,
Dino
pcm.multi {
type multi
slaves.a.pcm "dmix:0,0" # main sound card
slaves.a.channels 2
slaves.b.pcm "dmix:1,0" # usb sound card
slaves.b.channels 2
bindings.0.slave a
bindings.0.channel 0
bindings.1.slave a
bindings.1.channel 1
bindings.2.slave b
bindings.2.channel 0
bindings.3.slave b
bindings.3.channel 1
}
2009/10/1 Neil Sutton <swift_gti@xxxxxxx>:
> Thanks for that, just tried it out but when using it I don't get any sound
> at all.. from either device.
> I think I understand the config up to where it's specifying pcm.!default but
> not sure what it's doing after that.
> When I try to play a wave file using aplay I get;
>
> xbmc@Revo-ION:~$ aplay testing.wav
> Playing WAVE 'testing.wav' : Signed 16 bit Little Endian, Rate 11025 Hz,
> Mono
> ALSA lib pcm_params.c:2135:(snd1_pcm_hw_refine_slave) Slave PCM not usable
> aplay: set_params:957: Broken configuration for this PCM: no configuration
> available
> Is there any other output I can get that could help figure out what's gone
> wrong?
>
> Many Thanks
> Neil
>
>> Date: Thu, 1 Oct 2009 10:02:25 +0200
>> Subject: Re: Clone Audio between onboard card and USB adapter
>> From: dino.puller@xxxxxxxxx
>> To: swift_gti@xxxxxxx
>> CC: alsa-user@xxxxxxxxxxxxxxxxxxxxx
>>
>> Try this configuration:
>>
>> pcm.multi {
>> type multi
>> slaves.a.pcm "dmix:0,0" # main sound card
>> slaves.a.channels 2
>> slaves.b.pcm "dmix:1,0" # usb sound card
>> slaves.b.channels 2
>> bindings.0.slave a
>> bindings.0.channel 0
>> bindings.1.slave a
>> bindings.1.channel 1
>> bindings.2.slave b
>> bindings.2.channel 0
>> bindings.3.slave b
>> bindings.3.channel 1
>> }
>>
>> pcm.hdaloop_out {
>> type route
>> slave.pcm "multi"
>> slave.channels 4
>> ttable.0.0 1
>> ttable.1.1 1
>> ttable.0.2 1
>> ttable.1.3 1
>> }
>>
>> pcm.!default {
>> type asym
>> playback.pcm {
>> type plug
>> slave.pcm "hdaloop_out"
>> }
>> capture.pcm {
>> type plug
>> slave.pcm "dsnoop:0,0"
>> }
>> }
>>
>> 2009/10/1 Neil Sutton <swift_gti@xxxxxxx>:
>> > Hi All,
>> >
>> > I'm currently trying to setup Alsa so that it clones all the audio sent
>> > to
>> > my default soundcard (just bog standard onboard connected via headphone
>> > jack) and duplicates the output to a USB soundcard.
>> >
>> > I checked out the documentation for the asoundrc config but it's not
>> > making
>> > too much sense, the 'copy' plugin example seems way more complex than
>> > what
>> > i'm looking for.
>> >
>> > Currently I've got this, but i'm only getting audio output from the
>> > default
>> > onboard card..
>> >
>> >
>> > pcm.!default {
>> > type plug
>> > slave.pcm "dup"
>> > }
>> > pcm.dup {
>> > type copy
>> > slave.pcm "hw:0,0"
>> > slave.pcm "hw:1,0"
>> > }
>> >
>> > Here is the output of aplay -l (the first device is my default, the last
>> > is
>> > the one I want to clone to)
>> >
>> >
>> > **** List of PLAYBACK Hardware Devices ****
>> > card 0: NVidia [HDA NVidia], device 0: ALC662 Analog [ALC662 Analog]
>> > Subdevices: 0/1
>> > Subdevice #0: subdevice #0
>> > card 0: NVidia [HDA NVidia], device 3: NVIDIA HDMI [NVIDIA HDMI]
>> > Subdevices: 1/1
>> > Subdevice #0: subdevice #0
>> > card 1: Audio [USB Audio], device 0: USB Audio [USB Audio]
>> > Subdevices: 1/1
>> > Subdevice #0: subdevice #0
>> >
>> > Can anyone spot where I've gone wrong ?
>> >
>> > Many Thanks!
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