[alsa-devel] Need help implementing an external PCM/control plugin pair

[Dimitris Papavasiliou]

On 02/16/2018 12:38 PM, Takashi Sakamoto wrote:
> ALSA control core has a feature called as 'user-defined control element 
> set'. This will help your work, in my opinion. For example, alsa-lib 
> 'softvol' PCM plugin utilizes this feature to accomplishment 
> configurable volumes by the others[1]. This feature supports metadata by 
> TLV (Type-Length-Value) and eventing to subscribers as well.
> 
> The alsa-lib includes a test program for this feature, which I wrote[2]. 
> This may help your work by its actual code, I think[2].

Many thanks for your prompt reply Takashi!  I'll study your example code 
and report back, should I need further guidance.

D.