Re: [LAD] [alsa-devel] Using loopback card to Connect GSM two way call to the real sound card UDA1345TS - Linux-audio-dev

9 Mar 2015

Srinivasan S wrote:
...
  Could you please provide any inputs w.r.t the loopback
card using
 snd-aloop & alsaloop, how this loopback card can be used to connect
 the GSM two way call simultanoeusly to the UDA1345TS codec on MCASP0
 of the am335x (UDA1345TS ie., real sound card) 
snd-aloop creates a virtual sound card; it is not used with a real sound
card.

...
  The codec has two output channels VOUTL, VOUTR &
two input channels VINL , VINR

 With this am able to achieve only one way call at a time by running
 only one application at a time 
To allow a capture device to be shared, you need to use dsnoop.  Your
asound.conf already does this.

To allow a playback device to be shared, you need to use dshare or dmix.
(dshare allows to use _different_ channels; dmix allows mixing multiple
sources into the same channels.)  Your asound.conf does not do this; it
uses "hw" instead.

Regards,
Clemens