On Sat, 6 Jul 2002, John covici wrote:
> I found some controls "iec958 Playback Default" which can be changed
> but its a number of probably hex digits whose meaning I don't know.
> There is an Iec958 Playback Stream which says inactive in its comment
> should I ignore that one?
> I found Iec958 Master as a boolean so I can turn that on for playback.
> I found something called "H/w Playback Route" which has many possible
> values -- the only ones to do with iec958 say iec958 In L and R -- is
> that how you play through the sp/diff out by setting the hw playback
> route to this value? And should I use l or r for stereo programs?
> And there is another control of the same name but an index 1 what is
> this?
>
The "H/W Playback Route" defines which input will be routed to the analog
output. I usually put it to "Digital Mixer" to be able to set the volumes
with the alsamixer. It you set it e.g. to PCM or SP/DIF, the respective
input signal is passed directly to the DAC, meaning you cannot change
anything about it.
> I also have two iec958 playbback routes with one of them having
> index 1.
>
These are the settings you looked for: The one with index=1 is the right
channel, the other the left. Set them to whatever source you want to send
to the SP/DIF output: to make a direct copy you can set it to SP/DIF In,
but you can also use PCM or the Digital Mixer to route the computer
generated sounds to your SP/DIF output. The advantage of the Digital Mixer
setting is that you will be able to listen to a CD (from your CD-drive)
while also hearing other sounds (if you set the volumes/mute settings
correctly with alsamixer).
> Many of these controls have 12 enumerations 0 to pcmout and hw
> numbers except the last ones which are the iec958 and digital mixer
> whatever that is.
>
> So you see why I need some help on these -- its hard to tell what all
> these do.
>
I hope I was able to help a bit...
Ciao,
Roland
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