[alsa-devel] dsnoop do not works on snd-hda-intel

[Takashi Iwai]

At Mon, 17 Sep 2007 07:32:46 +0200,
Maxim Levitsky wrote:
> 
> On Monday 17 September 2007 07:21:03 Giovanni Maruzzelli wrote:
> > Hi all,
> > 
> > I hope someone can give me an hint on this problem, that is stopping me.
> > 
> > On my new laptop (asus f5v) dsnoop do not works, neither I can record
> > at the same moment with more than one application. The second
> > application that want to use the dsnoop, fail to open it.
> > 
> > I'm using Ubuntu 7.04 fully updated.
> > 
> > lspci gives:
> > 00:0f.0 Audio device: Silicon Integrated Systems [SiS] Azalia Audio Controller
> > 
> > cat /proc/asound/card0/codec#* | grep Codec gives:
> > Codec: Realtek ALC660-VD
> > Codec: Motorola Si3054
> > 
> > I've upgraded driver, lib, and utils to 1.0.14 but it do not helped.
> > 
> > I've put at the end of /etc/modprobe.d/alsa-base
> > options snd-hda-intel model=3stack-660
> > 
> > I can always reproduce the behavior, for eg:
> > 
> > root at ubuntu-lap:~# arecord -Ddefault ciao.wav &
> > [1] 6923
> > root at ubuntu-lap:~# Recording WAVE 'ciao.wav' : Unsigned 8 bit, Rate
> > 8000 Hz, Mono
> > 
> > root at ubuntu-lap:~# arecord -Ddefault ciao2.wav &
> > [2] 6926
> > root at ubuntu-lap:~# ALSA lib pcm_dsnoop.c:606:(snd_pcm_dsnoop_open)
> > unable to open slave
> > arecord: main:545: audio open error: Invalid argument
> > 
> > [2]+  Exit 1                  arecord -Ddefault ciao2.wav
> > 
> > I can give any additional info is needed.
> > 
> > Thank you all in advance,
> > 
> > Giovanni Maruzzelli
> > _______________________________________________
> > Alsa-devel mailing list
> > Alsa-devel at alsa-project.org
> > http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
> > 
> 
> Hi,
> 
> I was also hit by this problem 
> 
> To fix this you need to open /usr/share/alsa/pcm/dsnoop.conf
> and change 
> 
> 	@args.SUBDEV {
> 		type string
> 		default -1
> 
> to
> 
> 	@args.SUBDEV {
> 		type string
> 		default 0
> 
> I was told that this is a feature of alsa, not bug, I don't know.
> 
> the above will make dsnoop to record from hw:0,0
> 
> Also, I bet that your hardware can record more that one stream a time.
> So you can also try recording from hw:0,1 or hw:0,2
> 
> you can check how many streams can be recording at same time in /proc/asound/Intel/pcm0c/info
> look at subdevices_count
> 
> Each stream can have its own input source, so check your mixer to make sure that 
> each stream records what you want, eg: records from same source, or not,
> is enabled or not, and has enough gain.

Ah, actually it should be counted as a bug.
The -1 works well for the devices with a single substream but not for
the devices with multiple substreams.  Should be 0 for dmix/dsnoop.
I'll fix alsa-lib HG tree now.

thanks,


Takashi