[Voyage-linux] Voyage-linux Digest, Vol 95, Issue 4

[Demian Martin]

I have the HiFace adapter working now on all the sample rates. I did a few
hacks to integrate the source into  Linux3.6.6 Kernel and compiled and it
all worked fine.

I have attached the revised Kconfig and Makefile. These go into the
/sound/usb directory of the source tree. I have only tested it in 3.6.6. I
hope the author can be persuaded to submit it to Alsa.

Here is the config stuff for mpd:

#
audio_output {
       type          "alsa"
       name          "USB"
       device        "hw:1"    	# optional
}
#

If there is a problem it may be because I forgot some tweak, or because its
not destined to work in any other implementation and I was just lucky. Let
me know and I'll check what I did.

> -----Original Message-----
> From: Demian Martin [mailto:demian at auraliti.com]
> Sent: Monday, November 05, 2012 8:34 PM
> To: 'voyage-linux at list.voyage.hk'; 'martin.larsson2 at gmail.com';
> 'grossi at di.unipi.it'
> Subject: RE: Voyage-linux Digest, Vol 95, Issue 4
> 
> There are two hurdles to getting a new sound device working in Linux. The
> first is the driver. I followed the link and figured out how to patch it
into the
> Kernel I'm using and get it to compile successfully. It would be great to
have
> the author submit it to Alsa and get it into the Kernel. I find these
isolated
> drivers a pain to maintain. The second is getting the interface talking
> correctly. My suggestions follow.
> 
> I'll have a HiFace here in a day to try but from the notes posted I would
> suggest you use this to test:
> aplay -v -D plughw:0,0 file.wav   # the "plughw" tells alsa to reformat to
> match the device.
> 
> New versions of mpd (16 and above) will format to 24 bit internally, but I
use
> this for USB and it seems to always work. If not change it to plughw and
try.
> 
> audio_output {
>        type          "alsa"
>        name          "USB"
>        device        "hw:1"    	# optional
> 	mixer_device	"none"		# optional
> #	mixer_device  "hw:1"        # optional
> #     	mixer_control "PCM"         # optional
> #    	mixer_index   "0"           # optional
> }
> 
> There is a way to restrict usb audio devices to enumerate to device 1 and
up.
> I have forgotten how I did it.
>              Demian
> 
> > -----Original Message-----
> >
> > ---------- Forwarded message ----------
> > From: Martin Larsson <martin.larsson2 at gmail.com>
> > Date: Mon, Nov 5, 2012 at 7:23 PM
> > Subject: Re: [Voyage-linux] compiling kernel module for Hiface 1
> > drivers
> > To: Roberto Grossi <grossi at di.unipi.it>
> >
> >
> > Yeah I'm trying to NOT play 32bit :) Are you sure it played 96khz? and
> > 44 worked as well? how did you configure alsa/mpd? Feels like i've
> > tried everything.
> >
> > thanks for the info
> >
> > best regards martin
> >
> >
> > On Mon, Nov 5, 2012 at 5:00 PM, Roberto Grossi <grossi at di.unipi.it>
> wrote:
> >
> > > My Dac can handle 24/192 but the hiFace is integrated in a Behringer
> > > 24/96, so this the max resolution I can check.
> > > Not sure that you need to use 32 bits any way
> > >
> > > Cheers
> > > Roberto
> > >
> > >
> > > On Mon, Nov 5, 2012 at 3:50 PM, Martin Larsson
> > <martin.larsson2 at gmail.com>wrote:
> > >
> > >> Can your dac handle 32bit input? According to an alsa guy I talked
> > >> to on IRC, the driver in its current state can only use 32bit.
> > >>
> > >> best regards
> > >> martin
> > >>
> > >>
> > >> On Mon, Nov 5, 2012 at 2:05 PM, Roberto Grossi
> > <grossi at di.unipi.it>wrote:
> > >>
> > >>> Sorry, I thought you had some special config. BTW, the author of
> > >>> the drive is from Pisa, so I'm going to meet him in few days since I
live
> here.
> > >>>
> > >>> As for mpd, it does not resample in my case:
> > >>>
> > >>> cat /proc/asound/hiFace/pcm0p/sub0/hw_params
> > >>> access: MMAP_INTERLEAVED
> > >>> format: S32_LE
> > >>> subformat: STD
> > >>> channels: 2
> > >>> rate: 44100 (44100/1)
> > >>> period_size: 4096
> > >>> buffer_size: 8192
> > >>>
> > >>>
> > >>> Cheers
> > >>> -Roberto
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