On Tue, 9 Nov 2010, David Henningsson wrote: > On 2010-11-09 15:58, Jaroslav Kysela wrote: >> On Tue, 9 Nov 2010, David Henningsson wrote: >> >>> I have seen a few HDMIs which share the HDA controller with the onboard >>> sound card, but the codecs are different, e g the onboard one is at >>> address #0 and the HDMI is at address #3 - or even #3, #7, #8 and #9 in >>> some cases. >>> >>> Now, if the user specifies the device string hdmi:x (where x is card >>> name/number), I'd like it to kind of autodetect this and use DEV=3 >>> instead of DEV=0, and without breaking the cards where the hdmi is a >>> separate card with a codec at address #0. However, it still seems like >>> the device is at DEV=3 somehow. >>> >>> Now, looking at /usr/share/alsa/cards/HDA-Intel.conf, I notice that >>> there are entries HDA-Intel.pcm.hdmi.0 which sets DEV=3, so it seems >>> like someone already thought of this. However, just using "hdmi:x" does >>> not trigger "DEV=3". I'm still not grepping all of the alsa lisp >>> architecture stuff, so could someone explain to me how the >>> HDA-Intel.pcm.hdmi.0 entry relates to the "hdmi:x" alsa device string? >> >> It's not about a lisp (this portion of code is not used at all). It's >> about the (partly) dynamic alsa-lib configuration. > > Ok, thanks for the clarification. > >> Use always indexes from 0.. (hdmi:0,0 etc..) Fist number is card number, >> second number is device number (which is logical device number mapped to >> different physical device number in case when HDA card contains both >> analog and HDMI sections). >> >> If you read HDA-Intel.conf, you'll get this device mapping (logical, >> physical): >> >> 0 -> 3 >> 1 -> 7 >> 2 -> 8 >> 3 -> 9 >> >> Perhaps, something does not work correctly? > > Hmm, this is a little confusing. Do all these mean the same thing, and do > they all correspond to the logical device number? > > hdmi:x,y > hdmi:CARD=x,y > hdmi:CARD=x,DEV=y > hdmi:CARD=x,DEVICE=y > > And would hdmi:x and hdmi:x,0 be the same thing? Yes, if defaults.pcm.iec958.device -> default.pcm.device is 0 (check alsa.conf). > And if all these correspond to the logical device number, is there any way > you can specify the physical device number directly in the connect string? You have to use hw:x,y (or plughw:x,y) device. The purpose of hdmi device name is that you want the hdmi output and index the devices in some logical way. It's something like 'default', 'front', 'surround*', 'iec958' devices. Jaroslav ----- Jaroslav Kysela <perex@xxxxxxxx> Linux Kernel Sound Maintainer ALSA Project, Red Hat, Inc. _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
