>On Fri, 11 Jan 2002, Paul Davis wrote: > >> ok, suppose i merge two PCM devices into one "multi" device. then >> suppose i do the same for the corresponding control device. >> >> how does an application access the control switches for the multi >> device? in the underlying "hw" devices, there are duplicate sets of >> control switch names. how can i refer to a particular switch? >> >> the particular case i am thinking of is the hammerfall "monitor" >> switch, which is a 32 bit value controlling the status of "thru" or >> "zero latency" monitoring for each of 18 or 26 channels. but in a >> "multi" device, how would i control such things? or does the "multi" >> device not provide a control interface? the same issues would seem to >> apply to almost any control switch for any (set of) audio interfaces... > >PCM and control interfaces are two different things. There is no mapping >between PCM and control interfaces except on "hw" level (physical card and >device numbers). The "multi" pcm device is an abstraction for PCM not for >control API.
hmm, i suppose this could be considered a user error. even so, it is a bit problematic since there are several standardized control switch names that an application might want to use that will not do the right thing with a multi PCM device. --p _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
