On Tue, Dec 08, 2015 at 11:59:41AM +0100, Takashi Iwai wrote: > On Tue, 08 Dec 2015 11:51:40 +0100, > Takashi Iwai wrote: > > > > On Tue, 08 Dec 2015 11:42:57 +0100, > > Vinod Koul wrote: > > > > > > On Tue, Dec 08, 2015 at 11:28:16AM +0100, Takashi Iwai wrote: > > > > > Yes that was my thinking based on discussion and patches posted by Libin. > > > > > But one more question who does PCM assignment, looking at patches it seems > > > > > driver and no way to change that.. > > > > > > > > > > For example I have 10 devices connected and we have 5 PCMs. > > > > > I would like to route to 7th device, how would that be done? > > > > > > > > Manage xrandr to enable the target monitor. Then one PCM stream will > > > > be switched to the corresponding audio, and it'll be notified to > > > > user-space. > > > > > > Thanks, that helps.. > > > > > > Looking at RFC patches I do not see that implemented, so maybe Libin > > > and you will add that eventually > > > > > > The question here is how will the switch be handled, can you please > > > elaborate on that. From xrandr selection how will audio driver be > > > notified and how will change be done? > > > > The switch itself has to be done voluntarily by user-space, > > unfortunately, as in the current form. We thought of the preemptive > > disconnection. It works for aplay, but screws up PulseAudio, so > > no-go. > > Maybe the above wasn't clear enough. Put in that way: the assignment > of PCM stream and the switching of PCM stream are different things. > The former is done at the time the HDA driver gets notified by i915 > (actually happens twice, one for disabling and one for enabling). The > audio driver notifies this to user-space. Then user-space closes / > reopens a stream accordingly, which is equivalent as switching a PCM > stream. Thanks for the explanation :) SO how do you notify, thru alsa jack control. In that case if we had assigned PCM to pin 5, device 62 and change to pin 5 device 35, how would userspace view this > We've tested the PCM switching in the driver side, but it broke the > compatibility with PA. So the switching itself is voluntarily done by > user-space. -- ~Vinod _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
