Subject: Re: [ecasound] using rme96 with alsa; four tests
From: Jeremy Hall (jhall_AT_uu.net)
Date: Wed Apr 10 2002 - 12:54:44 EEST
Hi,
With ecasound, if you want to tell it to use the hardware, you have to do
alsahw,0,0 and alsahw,0,1
You should be aware that the hardware layer is pretty strict on what it
wants. I recommend using jack for the rme series cards, the alsa support
in ecasound doesn't seem to get it right. You'll want to use the CVS
versions of ecasound, jack, and alsa. If you are using 0.5.x alsa, then
you'll most certainly be having problems with any rme card given that Paul
basically rewrote the driver for the current version.
Jack can be found at jackit.sf.net, alsa can be found at alsa.sf.net, and
ecasound can be found wherever you got it. For alsa,
check out modules alsa-kernel, alsa-driver, alsa-lib, alsa-utils, and
alsa-oss.
Run ./cvscompile from within alsa-driver, alsa-lib, alsa-utils, and
alsa-oss. You'll need to make install right after a successful cvscompile
in each of these, so
cd alsa-driver
./cvscompile
make install
cd ../alsa-lib
./cvscompile
make install
etc
After successfully building these, install jack's CVS. I recommend you
join the jack mailing list since it is under quite a bit of
development. After installing jack, build a fresh ecasound, destroying
your previous source tree or moving it out of the way.
Good luck
_J
In the new year, Janroel Koppen wrote:
> Hi there,
>
> As you might know, having read my previous postings, I'm using an RME
> digi96/8 card. Since I still have trouble using the ADAT mode - it gives
> an anoying click train - I setup four very simple tests. Can anybody
> help me explain the outcome?
>
> First of all I have to give (as root):
> > modprobe snd-card-rme96
>
> Then, I try four possible ways of playing out a wave file:
>
> > aplay -D hw:0,0 stereo.wav works (s/pdif)
> > aplay -D hw:0,1 stereo.wav error (see below)
> > aplay -D plughw:0,0 stereo.wav works (s/pdif)
> > aplay -D plughw:0,1 stereo.wav works (ADAT) *NOISY*
>
> 0,0 means using the s/pdif channel
> 0,1 means using the ADAT channel
> hw means using the hardware layer
> plughw means using the software layer
> (I understand that in s/pdif mode coaxial and optical connectors carry
> the same signal, so I use optical only, since I can switch my DA
> convertor between s/pdif and ADAT reception)
>
> The resulting messages:
> Playing WAVE 'stereo.wav' : Signed 16 bit Little Endian, Rate 44100 Hz,
> Stereo
>
> Playing WAVE 'stereo.wav' : Signed 16 bit Little Endian, Rate 44100 Hz,
> Stereo
> play: set_params:724: Channels count non available
>
> Playing WAVE 'stereo.wav' : Signed 16 bit Little Endian, Rate 44100 Hz,
> Stereo
>
> Playing WAVE 'stereo.wav' : Signed 16 bit Little Endian, Rate 44100 Hz,
> Stereo
>
> So this leads me to the conclusion that the plughw layer converts the
> audio to 'fit' 8 channels and does a nasty job. Results are similar with
> 48000 Hz audio. I still have to repeat the second test with an 8-channel
> wave file...
>
>
> Let's redo the test with ecasound.
>
> ecasound -o alsa,hw:0,0 -i stereo.wav works (s/pdif)
> ecasound -o alsa,hw:0,1 -i stereo.wav works (s/pdif)!
> ecasound -o alsa,plughw:0,0 -i stereo.wav works (s/pdif)
> ecasound -o alsa,plughw:0,1 -i stereo.wav works (s/pdif)!
>
> the resulting message (four times identical):
>
> - [ Chainsetup/Enabling audio inputs ] --------------------
> (eca-audio-objects) Audio object "stereo.wav", mode "read".
> (audio-io) Format: s16_le, channels 2, srate 44100, interleaved.
> - [ Chainsetup/Enabling audio outputs ] -------------------
> (eca-audio-objects) Audio object "alsa", mode "write".
> (audio-io) Format: s16_le, channels 2, srate 44100, interleaved.
> - [ Engine/Init - mixmode "simple" ] ----------------------
> - [ Engine/Exiting ] --------------------------------------
>
> Apparently ecosound doesn't care much about the device number (would
> this be a bug?). (I know chain setup with ecasound is very flexible, but
> if it doesn't recognize the ADAT device in the first place, what's the
> use?)
>
> Greetz, Janroel
> --
> ________________________________________________________________
> |
> | Janroel Koppen, (+31)(0)15-27.86224
> | Information & Communication Theory Group,
> | Delft University of Technology, The Netherlands
> | J.Koppen_AT_its.tudelft.nl, www-ict.its.tudelft.nl/~janroel
> |_______________________________________________________________
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