[alsa-devel] RFC: PCM extra attributes
tiwai at suse.de
Fri Jun 19 14:46:11 CEST 2009
At Fri, 19 Jun 2009 13:43:08 +0100,
James Courtier-Dutton wrote:
> 2009/6/19 Takashi Iwai <tiwai at suse.de>:
> > The alsamixer view isn't the issue I'm concerned.
> > These spontaneous controls should be IFACE_PCM in the first place.
> > They shouldn't be IFACE_MIXER. For example, IEC958 status bits can be
> > associated to a dedicated PCM substream.
> Would an option could be to stream the IEC958 status bits with the PCM stream?
> I.e. As an extra channel of the PCM multichannel stream.
I don't buy it because the status bits don't need resend at each time.
And for compatibility reason, this is a huge gap.
If any, we have already IEC958 raw subframe support that embeds the
> Another option could be to stream the gain control values with the PCM stream.
> I.e. Instead of attributes attached to the PCM, stream those
> attributes with the PCM stream.
Hrm how can it be done? Could you elaborate?
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