[alsa-devel] [PATCH v2 1/2] ASoC: soc-compress: add a config item for soc-compress

[Vinod Koul]

On Wed, Jun 17, 2015 at 01:23:40PM +0100, Mark Brown wrote:
> On Wed, Jun 17, 2015 at 08:24:48AM +0530, Vinod Koul wrote:
> > > 	if (cpu_dai->driver->create)
> > > 		ret = cpu_dai->driver->create(rtd, num);
> 
> 
> > > and each driver passes soc_new_compress (or whatever) there.  This is
> > > flexible and can be extended if any new stuff has to be handled.
> > > Even PCM creation or dai widget links can be passed in that form,
> > > too.
> 
> > and the default would be snd_pcm_new so that *most* drivers dont need to add
> > this. Only Intel atom driver should add soc_new_compress() as create ops,
> > hence direct reference so no gaurds required
> 
> > Looks good to me then, Mark you okay with this approach?
> 
> I'm not sure this fully helps.  This will put the reference in the CPU
> driver which if there's sharing with non-compressed DAIs means that any
> machine driver using the platform needs to select the compressed audio
> code.  It also means that we're still in the situation whre if a machine
> *can* support compressed audio it *must* support compressed audio, it's
> not clear to me that people doing this sort of memory optimisation are
> always going to be doing it on hardware that doesn't have the capacity
> for compressed audio (or won't in the future).  But then I don't know
> exactly how much memory is being saved here...
Yes this is a good point but then driver can define the compressed dai only
when SND_SOC_COMPRESS is enabled. So if machine has enabled this symbol then
only dai get added and machine can create dai-link

Also for the size question, in sound-next we have 248KB soc-compress.o

Thanks
-- 
~Vinod