on the Blackfin processor, we have an "almost-but-not-quite" AC97 interface
(called a "SPORT"). the trouble is that we can hook up AC97 codecs, but in
order to properly communicate with codecs, we need to repacketize the
communication between the higher alsa layers and the actual SPORT. great ...
but now we want to support dmix/dsnoop. the overhead for dmix vs non-dmix is
such that we make it optional. if the user does not need software mixing,
they can disable this overhead. this leads to two (incompatible) alsa config
files (in this case, for the AD1980 codec). we're wondering if it's possible
to have the right settings selected on the fly some how during runtime rather
than having to select one file or the other.
the dmix config:
AD1980.pcm.default {
@args [ CARD ]
@args.CARD {
type string
}
type asym
playback.pcm {
type plug
slave.pcm {
@func concat
strings [ "dmix:CARD=" $CARD ]
}
}
capture.pcm {
type plug
slave.pcm {
@func concat
strings [ "dsnoop:CARD=" $CARD ]
}
}
}
the non-dmix config:
AD1980.pcm.default {
type plug
slave {
pcm {
type mmap_emul
slave {
pcm {
type hw
card 0
format S16_LE
rate 48000
channels 2
sync_ptr_ioctl 1
}
}
}
}
}
-mike
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