On Monday 18 May 2009, Johan Bakker wrote:
> The problem is that i cannot output sound to HDMI and SPDIF simultaniously.
> I tried .asoundrc with the copy and multi plugin but had no luck.
>
> Is it possible to play sound on both devices simultaniously?
in principle it should be. Have you tried something like the
.asoundrc in attach?
(found it somewhere on the 'net, perhaps on the MythTV WiKi or
something like that).
I have tried a similar config and (as far as I kept the same rate
on both outputs) it worked. I only had problem trying to resample
at different rates the different "duplicate" outputs.
Ciao,
Paolo.
--
You can still escape from the GATES of hell: Use Linux!
#ALSA Configuration (In Depth)
#
# I finally had a reason to get into ALSA in more depth, so this page will
summarize what I learned as well as
# describe my dual card setup.... but not right now, b/c I am tired :). For now
I am just dropping random bits
# of info here.
# Current setup in /etc/asound.conf
# Here is a diagram of what this config does:
#
#
'nforce' nForce2,0
# 4-channel
_______________ ____________
# SOFTVOL ROUTE MULTI 0L |
PLUG | | |
# ______________ __________ _________ /------->|
convert |------>| |
# 0L | | 0L | | 0L | | / | rate
& format | | Sound card |
# ------->| Software |------>|\---------|---->|---------|- 1R |
for HW | | |
# | volume | | \ | | | /------->|
|------>| |
# 1R | attenuation | 1R | \ | 1R | | /
|_______________| |____________|
# ------->| |------>|---\------|---->|---------|-
_______________
# |______________| |\ \ | 2L | | 0L |
PLUG | ____________
# 'softvol' | \ \----|---->|---------|---------->|
convert |------>| |
# | \ | 3R | | 1R | rate
& format | | Sound card |
# | \------|---->|---------|---------->|
for HW |------>| |
# |__________| |_________|
|_______________| |____________|
# 'both' 'multi'
'audiophile' M2496,0
#
#
################################################## BEGIN
##################################################
# Give our cards friendly aliases. Note that we are wrapping the cards with
'plug' plugin
# in order to perform automatic conversion of the stream from the original
format into
# the format suitable for each individual card.
#
pcm.nforce "plughw:nForce2,0"
pcm.audiophile "plughw:M2496,0"
pcm.!default main_device
# 'asym' plugin allows us to create assymetrical devices which have different
# interfaces handling playback and recording streams.
# This configuration ensures that playback is sent through the complicated
routing,
# but recording streams are fetched directly from Audiophile
#
pcm.main_device {
type asym
playback.pcm "softvol"
capture.pcm "audiophile"
}
# This device acts as a software volume control
pcm.softvol {
type softvol
slave {
pcm "both"
}
control {
name "SoftMaster" # This is the name of the mixer control
card M2496
}
}
# Here we are using the 'route' plugin to send the signal unchanged to a
# 4-channel device. Since the incoming stream is only 2-channel, we use
# the transfer table to copy channel 0 slave's input channel 0,
# channel 1 to slave's 1, and again channel 0 to slave's 2 and channel 1
# to slave's 3. The last column (1.0) is the volume, which we are leaving
unchanged
#
pcm.both {
type route
slave {
pcm multi
channels 4
}
ttable.0.0 1.0
ttable.1.1 1.0
ttable.0.2 1.0
ttable.1.3 1.0
}
# 'multi' plugin allows us to create many slave devices and then distribute the
stream's
# channels between the slaves.
# Here we define Slave a for the nforce card (headphones) and Slave b for the
Audiophile.
# Then we use channel binding to send channels 0 and 1 to the headphones and
channels
# 2 and 3 to the speakers
#
pcm.multi {
type multi
slaves.a {
pcm "nforce"
channels 2
}
slaves.b {
pcm "audiophile"
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.dsp0 {
type plug
slave.pcm "softvol"
}
ctl.main_device {
type hw
card M2496
}
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