Michael Hunold wrote:
> - iec958 5v: on
Not sure if it's for input or output (no difference here).
> - iec958 copyright: off (muted)
Obviously it refers to the "copyright bit", but I don't know when this
one comes into play.
> - iec958 in monitor: on
Seems to route the digital input to the analog output (if "iec958
output" is off).
> - iec958 in phase inverse: off (muted)
You'll here noise if the that one is wrong.
> - iec958 in select: on
Selects one of the two input channels.
> - iec958 in valid: on
Not sure.
> - iec958 loop: off (muted)
If on, it loops the digital input to the output.
> - iec958 mix analog: off (muted)
I don't have this one on my CMI8738-MC6.
> - iec958 output: off (muted)
Decides whether PCM output goes to the SPDIF out or to the analog out.
> (Of course I played around with these values, especially because I don't
> know what some of them actually mean (for example: in select, in valid,
> loop and mix analog))
>
> In theory, I'd like to record the raw iec958 subframes, but using
> arecord like this fails:
>
> > arecord -v -D hw:0,2 -f IEC958_SUBFRAME_LE
> arecord: begin_wave:1608: Wave doesn't support IEC958_SUBFRAME_LE format...
>
> I'm wondering what "wave" is about, since I want to capture the iec958
> subframes...
% arecord -v -v -D hw:0,2 -f IEC958_SUBFRAME_LE -r 44100 -c 2 -t raw a.raw
Recording raw data 'a.raw' : IEC-958 Little Endian, Rate 44100 Hz, Stereo
arecord: set_params:828: Sample format non available
I have no idea whether this IEC958_SUBFRAME_LE should be available from
my CD-ROM (maybe it's only on DVDs?).
> Using "arecord -v -v -D hw:0,2 -f dat > /tmp/a.wav", however, does not
> return anything on the device:
Apparently, arecord spits some of its error messages to stdout, so
arecord -v -v -D hw:0,2 -f dat /tmp/a.wav
is perhaps better. This works here (alsa-0.9.8, too), but with the
internal SPDIF input. Try toggling the "in select" switch.
Regards...
Michael
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