Hi :)
I'm not sure if my mails are getting through. I've posted one mail
before this via two emails, but I don't receive them from the list
mailer — I'm actually not receiving any mail from the list, but I
don't know if that's just because it's quiet ...
Either way, I apologize if they *are* getting through and I'm spamming!
If my previous mail did get through, then I can update that and say
that my multi output is now working.
If it didn't, here's my current setup:
I've set up an alsa config for a single PCM device playing back in 48
kHz on a USB dongle and 44.1 kHz on my onboard Intel SPDIF connector.
It works great except for one detail: The 48 kHz output is slightly
delayed compared to the 44.1 kHz output, I assume due to libsamplerate
being in the processing chain in the 48 kHz output.
I'd like to add a small delay to the 44.1 kHz output, and I've seen
some examples of introducing delays to a virtual device by using
lsdspa. However, according to LSDSPA docs, all processing is done in
32 bits, and I would really prefer to avoid any format conversion...
So, I was hoping to do it by perhaps increasing the buffer or
something like that on the SPDIF output, but I can't figure out how.
The ALSA docs for slave pcm state that "buffer_time" and "period_time"
are valid fields, but if I try to use them, I get an error like,
"(snd_pcm_slave_conf) Unknown field buffer_size".
I cannot use buffer_size and friends on the plug or the slave as
they're only valid for hw types...
Is there a way to do this?
Thanks in advance,
Daniel :)
My current .asoundrc:
# AKA Secret Rabbit Code resampler (best conversion, highest CPU utilization):
defaults.pcm.rate_converter samplerate_best
# Virtual PCM device for the NAD DAC with literal format and rate conversion:
pcm.nad {
type plug
hint {
show on
description "NAD DAC 1 via wireless USB dongle"
}
slave {
pcm "hw:Headset,0"
format S16_LE
channels 2
rate 48000
}
}
# Virtual PCM device for Intel SPDIF with literal format and rate conversion:
pcm.aa2 {
type plug
hint {
show on
description "AudioAlchemy 2.0 via Intel SPDIF coax plug"
}
slave {
pcm "hw:Intel,1"
format S16_LE
channels 2
rate 44100
# buffer_time 13405
# period_time 16384
}
}
# Virtual PCM device that outputs through both the NAD and Intel devices:
pcm.both plug:both_route
pcm.both_route {
type route
slave.pcm {
type multi
slaves.b.pcm aa2
slaves.a.pcm nad
slaves.a.channels 2
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
}
ttable.0.0 1;
ttable.1.1 1;
ttable.0.2 1;
ttable.1.3 1;
}
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