[alsa-devel] Does ASoC support sound card with multiple interfaces?

Rajeev kumar rajeev-dlh.kumar at st.com
Wed Jan 4 08:03:39 CET 2012

On 1/4/2012 12:30 PM, Ashish Chavan wrote:
>> You need to redirect it . You can use
>> aplay -Dplughw:0,1 x.wav.
>> Here '0' indicated card number and '1' indicates device number
> Is it really mandatory to specify card and device id? Isn't there a
> middle layer that takes care of using "first free" interface for
> playback or recording, if interface is not explicitly specified? As we
> register DAIs with ALSA subsystem, it should be fairly easy for alsa-lib
> to find out "first free" interface.
> I am aware that this wouldn't be practically useful in most cases,
> because generally we know beforehand which specific interface to be used
> for playback/recording. In such cases, automatic selection of interface
> may be confusing to users. But I just want to confirm if this is at all
> possible?

AFAIK, automatic selection is not there


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