When does a application use the SPDIF output?
Two possibilities:
- via the normal pcm device (hw:0,0):
set up the correct parameters, 44100 or 48000 Hz, S16 LE 2 channels,
then spdif will be turned on. otherwise it's shut up.
Usually OSS's /dev/dsp corresponds to this device.
- via the third pcm device (hw:0,2)
this device accepts only the parameters like above and spdif is
always turned on.
when you access via alsa plugin layer (i.e. plughw:0,2), then the
sample rate, format, and channels will be automatically converted
inside alsa-lib.
Also, additinoally you'll need to turn on "IEC958 Output Switch".
When I select /dev/dsp (default) i have ALWAYS SPDIF output, but never normal
analog. Only when I play files which have not the correct parameters I get
analog output.
Ciao Chris.
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