I have a .asoundrc on my media server that outputs 7.1 over HDMI
(Nvidia g220) that's worked great but now I want to also send audio to
ffserver so I can listen to any audio playing on the media server from
other devices (phone and my AV receiver) in other areas as well.
The current .asoundrc is:
### Begin Dump ###
pcm.!default {
type hw
card 1
device 7
}
ctl.!default {
type hw
card 1
}
### End Dump ###
And on my desktop (which doesn't require special card # and device #
to be specified) I used this to test out ffserver to get audio to my
phone and receiver in another room:
### Begin Dump ###
pcm.!default {
type asym
playback.pcm "LoopAndReal"
capture.pcm "hw:0,0"
}
pcm.LoopAndReal {
type plug
slave.pcm mdev
route_policy "duplicate"
}
pcm.mdev {
type multi
slaves.a.pcm pcm.MixReale
slaves.a.channels 2
slaves.b.pcm pcm.MixLoopback
slaves.b.channels 2
bindings.0.slave a
bindings.0.channel 0
bindings.1.slave a
bindings.1.channel 1
bindings.2.slave b
bindings.2.channel 0
bindings.3.slave b
bindings.3.channel 1
}
pcm.MixReale {
type dmix
ipc_key 1024
slave {
pcm "hw:0,0"
rate 48000
#rate 44100
periods 128
period_time 0
period_size 1024 # must be power of 2
buffer_size 8192
}
}
pcm.MixLoopback {
type dmix
ipc_key 1025
slave {
pcm "hw:Loopback,0,0"
rate 48000
#rate 44100
periods 128
period_time 0
period_size 1024 # must be power of 2
buffer_size 8192
}
}
### End Dump ###
So my question is, how do I preserve a 7.1 output to over HDMI but
downmix audio to 2 channels for sending to ffserver? I saw one
.asoundrc that had all sorta of additional bindings.(0-5) and table
work for 5.1 output but that's a little over my skill level with alsa.
Does a 7.1 have to have all sorta of extra bindings and table work for
8 channel output on one of the devices or is there a easier way to
keep the .asoundrc simple and just have to specify "keep output
working like it has been but also duplicate the audio"?
Thanks.
Brandon
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