Paul,
Thank you for your help and speedy response. Please bear with me as I am
still confused (surprise, surprise).
When i first ran this script it complained alsactl cound not find device
"9652". I changed the 'Card_ID="9652"' to 'Card_Id = "card0'" and it
seemed to run just fine. I popped in a CD and ran XMMS and still no
sound. Ok, I opened up my /stc/asound.state file (which looked as I sent
it to you the other day and changed Control.15 (Passthru) to 'true',
control.8 (Preferred Sync Source) to 'IEC958' and all values in
control.9 (Channels Thru) to True. I booted up Xmms and still no sound.
A few things concern me. Do the settings in control.9 (Channels Thru)
have anythign to do with the settings under Punch status numbered 1-18.
When I set all the values under control.9 to true and look at the card
status via 'proc /proc/asound/card0/rme9652 the channels labled 1-16 are
on, but the channels 17 and 18 are off. Control 1-3 in the asound.state
fine I don;t know what to do with so I am leaving them alone.
Thanks again for you help. I am not a pro audio person (no..really?). I
am an audiophile who loves computers and would not be satisfied with a
soundblaster. I'm looking into something with D/A converters on board
like the LynxTWO (no drivers yet, I know and the EGO_SYS WaveTerminal
192l). Until then, I'm sweat with this RME..
Thanks,
Bearcat
On Tue, 2002-04-09 at 07:48, Paul Davis wrote:
> >Whoops! I re-read that an realized my spelling checker screwed up. I
> >meant that "Paul Davis thought that you could NOT connect this to a
> >cdrom drive output, but i have called a few vendors and the believe this
> >is not the case "
> >
> >There is defiantly confusion on this issue. I talked to 8 vendors. 5 of
> >them thought that you could connect the 2 pin digital out from a cdrom
> >drive to the card at the cd-in port and 3 weren't sure. It is after all
> >labeled "CD-ROM/Sync in" and there is a "Internal" setting on the
> >IEC958 Input Connector' option
> >
> >There has to be a way to get this working...even if i have to call
> >Germany.
>
> i completely take back everything i said before. i'm sorry. i forgot
> about this stuff.
>
> ok, lets get back to where you were. yes, connecting it to that
> connector and setting the 'IEC958 Input Connector' to "Internal"
> should work, assuming that the cd player is generating actual IEC958
> data, which is probably is. you may need to set the various IEC958
> switches (these are common to all ALSA devices, BTW).
>
> however, you won't hear anything just doing that because the
> hammerfall doesn't have a mixer in the normal sense. what happens
> to the signal is that unless the card is running, it will just vanish
> into a black hole. the hammerfall runs every channel in sync with
> every other channel, and it runs playback in sync with capture, so
> there are only two states for the card: all channels on, or all
> channels off.
>
> what you need to be able to hear the CD signal is to put the card into
> what i call "passthru" mode. this is something that AFAIK, only the
> ALSA driver can do. it turns the card on, but disables interrupts so
> that we don't waste CPU cycles handling them. the card will pass all
> data arriving at input connector N to output connector N, and you can
> hear the results (assuming you've got the output connected to
> something that can use it).
>
> i enclose below the script i use to do this (its been posted on
> alsa-devel and lad a few times). but please note: as i said above, the
> hammerfall has no mixer - its not like a conventional consumer
> interface - and so as soon as an application opens the card, passthru
> mode be turned off (the card has to be stopped when opened), and the
> signal arriving at the IEC958 (S/PDIF) connectors will be lost until
> the application starts the card running (and does not enable
> monitoring on those channels).
>
> also note that you cannot route the destination of the signal when in
> passthru mode. it uses the hardware to just move channel N input to
> channel N output. on the hammerfall DSP, this will be different.
>
> let me know if you have more questions. sorry about my earlier
> misinformation.
>
> --p
>
> #!/bin/sh
>
> #
> # turns "passthru" mode on a Hammerfall card on or off
> #
>
> CARD_ID="9652"
> ALSACTL_FILE=/tmp/hammerthru$$
>
> if [ "$1" = "-c" ] ; then
> CARD_ID=$2;
> shift;
> shift
> fi
>
> if [ $# -lt 1 ] ; then
> setting="false"
> else
> case $1 in
> on|y|yes|true) setting="true";;
> *) setting="false";;
> esac
> fi
>
> cat << EOX > $ALSACTL_FILE
> state.$CARD_ID = {
> control.15 = {
> comment.access = 'read write';
> comment.type = bool;
> iface = pcm;
> name = Passthru;
> value = $setting;
> };
> };
> EOX
>
> /usr/sbin/alsactl -f $ALSACTL_FILE restore $CARD_ID
> status=$?
> rm -f $ALSACTL_FILE
> exit $status
>
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