[alsa-devel] [PATCH] Re: iec958 switch uneffective while playing ac3 stream

Dominique Dumont domi at komarr.grenoble.hp.com
Tue Apr 10 15:25:52 CEST 2007

Takashi Iwai <tiwai at suse.de> writes:

> I don't care much about wording, so I'd like to ask you guys which
> one is better.  In general, we have the following modes for SPDIF
> output:
> 1. "Exclusive" / "Independent" mode
>   You'll have a dedicated SPDIF stream, suitable for AC3/DTS output.
> 2. "Duplicate" / "Shared" mode
>   The normal analog output is copied to SPDIF output.
> 3. (codec-dependent) "Analog Loopback" mode
>   The analog line-in / CD / mic-in (and mixer) is loopbacked to SPDIF
>   output
> 4. (codec-dependent) "SPDIF Loopback" mode
>   The SPDIF-input is loopbacked to SPDIF output

Since we can have more that one word in the label, we can have a more
consistent set :

1. "SPDIF-out only"
2. "Analog-out copy"
3. "Analog-in loopback"
4. "SPDIF-in loopback"


Dominique Dumont 
"Delivering successful solutions requires giving people what they
need, not what they want." Kurt Bittner

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