Hi list,
First post here.
I have a problem. I have a atom/Ion based htpc and want to use HDMI and
SPDIF on the Ion to output 2 channels. I have configured everything with
the asound.conf file below and I get audio out of both HDMI and SPDIF
nicely. I have two problems:
1) Audio is timed differently through the two interfaces. I'd like to
add a hundred or so milliseconds delay to both channels of one of the
outputs. Is there a way of doing this to get the two outputs in sync?
2) The HDMI output can only handle 48kHz output, the SPDIF can handle
44.1kHz or 48kHz. I want to be able to output bit-perfect 44.1 out of
the SPDIF port when playing CDs. The SPDIF port will output 44.1kHz if I
output to it alone (with a different config file), but the whole
playback chain defaults to 48kHz as soon as the HDMI is used, no matter
what sampling rate the source material has. Is there a way of getting a
44.1kHz signal out of the SPDIF port whilst replicating and sample rate
converting it to 48kHz out through the HDMI port?
Many thanks
Andy
-- asound.conf file:
#
# Define the "2ip_to_4op" port
# Here it is a router that takes 2 input channels
# and routes them to 4 output channels for the pcm.multi pcm to take
# It defines a 4 channel output with the slave command
# and then routes channel 0 input to channel 0 & 2 output
# and routes channel 1 to outputs 1 and 3
# all with a unitary gain
#
pcm.2ip_to_4op {
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
}
#
# Define the S/PDIF output (hw:0,1) as "digital_1"
pcm.digital_1 {
type hw
card 0
device 1
channels 2
}
#
# Define the HDMI output (hw:0,3) as "digital_2"
pcm.digital_2 {
type hw
card 0
device 3
channels 2
}
#
# Define the multi process which takes it's 4 channel input from
# the "2ip_to_4op" pcm process. The device type plugin is a multi
# and defines two slave outputs (a and b). It then binds channels 0
# and 1 to slave.a channels 0 and 1 and binds channels 2 and 3 to
# slave.b channels 0 and 1.
#
pcm.multi {
type multi
slaves.a {
pcm "digital_1"
channels 2
}
slaves.b {
pcm "digital_2"
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
}
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