Takashi Iwai <tiwai@xxxxxxx> writes: > On Thu, 06 Apr 2017 21:46:29 +0200, > Eric Anholt wrote: >> >> Takashi Iwai <tiwai@xxxxxxx> writes: >> >> > On Thu, 02 Mar 2017 11:49:33 +0100, >> > Boris Brezillon wrote: >> >> >> >> Add a conf file for the VC4-HDMI sound card. >> >> >> >> Signed-off-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxxxxxxx> >> >> --- >> >> Hi, >> >> >> >> Sorry for the noise, but I didn't send this patch to the alsa-lib >> >> maintainer on my first attempt. >> >> >> >> This patch is adding a card config file for the audio sound card whose >> >> driver has been submitted here [1] (not accepted yet). >> >> >> >> Since I am a total newbie to the alsa world, I'd like to get some >> >> feedback on this patch. >> >> >> >> Also, the card only supports 2 to 8 channels, and I wonder if we should >> >> add a plug element to support mono streams, and where this element >> >> should be added (after or before the iec958 element). >> > >> > Applied, thanks. >> >> Thanks! >> >> Any recommendations on how to restructure this so that things like >> 'aplay' from the console also work by default? > > Well, once after you have your card config in > /usr/share/alsa/cards/vc4-hdmi.conf, aplay should work as is. > > If not, check /proc/asounds output. The entry looks like > 0 [ID ]: DRIVER - SHORTNAME > LONGNAME > > and in your case, "DRIVER" must be "vc4-hdmi", as same as the config > file name. It doesn't work as is -- the default ends up not having iec958 conversion, so nothing will play. You can do aplay -D iec958, which works but only as long as you've got stereo input (it seems plug can't do mono-to-stereo on iec958 data)
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