[alsa-devel] [PATCH v4 6/8] ASoC: compress: Add support for DAI multicodec

[Mark Brown]

On Thu, Jul 03, 2014 at 05:36:13PM +0530, Vinod Koul wrote:
> On Thu, Jul 03, 2014 at 01:46:23PM +0200, Benoit Cousson wrote:
> > On 03/07/2014 13:43, Lars-Peter Clausen wrote:
> > > On 07/03/2014 01:39 PM, Benoit Cousson wrote:
> > >> On 03/07/2014 13:20, Lars-Peter Clausen wrote:
> > >>> On 07/03/2014 01:09 PM, Benoit Cousson wrote:
> > >>>> On 03/07/2014 08:41, Vinod Koul wrote:
> > >>>>> On Wed, Jul 02, 2014 at 02:53:50PM +0200, Benoit Cousson wrote:

People, please delete irrelevant context from your e-mails - it makes it
easier to find the new content.

> BUT Now thinking over this again, does this make sense do do with multiple
> codecs??

> For folks haveing decoders in DSP inside SoC, the compressed device will be
> actually a FE. The BE will be PCM to which codec would be linked. The folks
> supporting decoders inside codec like WM wont ever need this.

> Mark, do you agree to this?

> So re-thinking again on why we need this??

The use case tends to be for applications that have one device per
physical output.  This isn't normally mobile, it's normally high
performance audio applications where people are doing things to try to
electrically isolate the analogue outputs or dealing with high power so
need to keep speaker outputs physically separate.  I can imagine set top
box type applications (which do use offloaded media decode) doing this.
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