Dear all, I've have been using ALSA for a year now and I have been working with several plugins. Now, I need to set up a device with asymmetric playback and record with dmix and dsnoop plugins. But, the recording device is at its time a multi plugin with four channels coming from two different devices of the same audio card. The problem is that It cannot make two applications to record audio simultaneously from the 4 channels.
* If I run:
arecord -D pal_robotics_default -f cd -r 48000 -c 4 > tmp.wav &
arecord -D pal_robotics_default -f cd -r 48000 -c 4 > tmp2.wav
The second call to arecord produces the following error:
> ALSA lib pcm_dsnoop.c:660:(snd_pcm_dsnoop_open) unable to open slave
> arecord: main:682: audio open error: Invalid argument
What I do is to have this sequencie of plugins:
hw_card0_dev0 -> dsnoop (2ch) |
| -> multi (4ch) |
hw_card0_dev2 -> dsnoop (2ch) | |
| -> asym -> plug ->
default
|
hw_card0_dev0 -> dmix |
I am concern about using two dsnopp plugins over the same card. Does anyone
know if this is a problem?
Regards.
--
Jordi Adell
PS: The asound.conf that I am using is the following one:
defaults.pcm.rate_converter = "speexrate"
pcm.rawjack {
type jack
playback_ports {
0 system:playback_1
1 system:playback_2
}
capture_ports {
0 system:capture_1
1 system:capture_2
}
hint {
description "JACK Bridge";
}
}
pcm.jack {
type plug
slave { pcm "rawjack" }
hint {
description "JACK Audio Connection Kit - ALSA plugin"
}
}
pcm.pal_dev0_48{
type dsnoop
slave{
pcm {
type hw
card "PAL_INTEL"
device 0
nonblock true
}
format S16_LE
rate 48000
channels 2
}
ipc_key 24800
}
pcm.pal_dev2_48{
type dsnoop
slave{
pcm {
type hw
card "PAL_INTEL"
device 2
nonblock true
}
format S16_LE
rate 48000
channels 2
}
ipc_key 24802
}
pcm.pal_play_44 {
type hw
card "PAL_INTEL"
device 0
format S16_LE
rate 44100
channels 2i
nonblock true
}
pcm.pal_play_48 {
type hw
card "PAL_INTEL"
device 0
format S16_LE
rate 48000
channels 2
nonblock true
}
pcm.pal_robotics_96{
type hw
card "PAL_INTEL"
device 0
format S16_LE
rate 96000
nonblock true
channels 2
}
pcm.pal_robotics_mix {
type dmix
ipc_key 24800
ipc_perm 0660
ipc_key_add_uid false
slave {
pcm pal_play_48
period_time 0
period_size 1024
buffer_size 4096
}
bindings
{
0 0
1 1
}
}
pcm.pal_robotics_asym{
type asym
capture.pcm pal_4ch
playback.pcm pal_robotics_mix
}
pcm.pal_robotics_asym_2ch{
type asym
capture.pcm pal_dev0_48
playback.pcm pal_robotics_mix
}
pcm.pal_robotics_default{
type plug
slave.pcm pal_robotics_asym
}
pcm.pal_robotics_2ch {
type plug
slave.pcm pal_robotics_asym_2ch
}
pcm.pal_robotics_file{
type file
slave{
pcm pal_robotics_mix
}
format "raw"
file "/tmp/pal_record.raw"
}
pcm.hw_headset {
type hw
card "PAL_HEADSET"
device 0
format S16_LE
rate 48000;
}
pcm.pal_headset {
type plug
slave {
pcm hw_headset
}
}
pcm.broadcast {
type plug
slave.pcm "both"
}
pcm.pal_4ch {
type multi
slaves.a.pcm pal_dev0_48;
slaves.b.pcm pal_dev2_48;
slaves.a.channels 2;
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.both {
type route;
slave.pcm {
type multi;
slaves.a.pcm "pal_robotics_asym_2ch";
slaves.b.pcm "jack";
slaves.a.channels 2;
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;
}
ttable.0.0 1;
ttable.1.1 1;
ttable.0.2 1; # front left
ttable.1.3 1; # front right
}
Jordi Adell
Speech Processing Engineer
<jordi.ad...@pal-robotics.com>
jordi.ad...@pal-robotics.com
www.pal-robotics.com
[image: cid:image003.png@01CAC1D4.21F0FEF0]
PAL Robotics, S.L.
c/ Pujades 77-79, 4º4ª
08005 Barcelona
Spain
Tel +34 93 414 53 47
Fax +34 93 209 11 09
Skype: jordiadell.pal-robotics
Facebook <http://www.facebook.com/palrobotics1> -
Twitter<http://twitter.com/#%21/palrobotics>- PAL
Robotics YouTube Channel <http://www.youtube.com/user/PALRobotics>
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