Hello,
I found a solution with LADSPA and bs2b for ALSA.
I did it on a moode Image because it is based on raspian (hope it is no problem to post my solution here).
That is what I did:
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apt-get install bs2b-ladspa
This is what I add to /etc/mpd.conf
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audio_output {
type "alsa"
name "ALSA default"
device "hw:0,0"
dsd_usb "yes"
}
#
audio_output {
type "alsa"
name "ALSA crossfeed"
device "crossfeed"
dsd_usb "yes"
}
And this is the /etc/asound.conf
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pcm.!default "crossfeed"
ctl.!default "crossfeed"
pcm.soundcard { type hw; card 0; device 0; }
pcm.plugSoundcard { type plug; slave.pcm "soundcard"; }
pcm.bs2b {
type ladspa
slave.pcm "plugSoundcard"
path "/usr/lib/ladspa" #path under arch linux will be an other ?
playback_plugins [ {
label bs2b
input {
controls [650 9.5]
}
} ]
}
pcm.crossfeed { type plug; slave.pcm "bs2b"; }
ctl.crossfeed { type hw; card 0; }
parameters in "controls [x x]" can be changed.
Here are some configurations of HZ and dB for Crossfeed:
source:
http://bs2b.sourceforge.net/These results shows a three versions with different sets of cut-off frequency and crossfeed level:
1) 700 Hz, 4.5 dB - default.
This setting is closest to the virtual speaker placement with azimuth 30 degrees and the removal of about 3 meters, while listening by headphones.
2) 700 Hz, 6 dB - most popular.
This setting is close to the parameters of a Chu Moy's [3] crossfeeder.
3) 650 Hz, 9.5 dB - making the smallest changes in the original signal only for relaxing listening by headphones.
This setting is close to the parameters of a crossfeeder implemented in Jan Meier's [4] CORDA amplifiers.
Change of output is possible with:
mpc disable 1
mpc enable 2
output of "aplay -L"
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null
Discard all samples (playback) or generate zero samples (capture)
plugSoundcard
bs2b
crossfeed
sysdefault:CARD=sndrpihifiberry
snd_rpi_hifiberry_dac,
Default Audio Device
dmix:CARD=sndrpihifiberry,DEV=0
snd_rpi_hifiberry_dac,
Direct sample mixing device
dsnoop:CARD=sndrpihifiberry,DEV=0
snd_rpi_hifiberry_dac,
Direct sample snooping device
hw:CARD=sndrpihifiberry,DEV=0
snd_rpi_hifiberry_dac,
Direct hardware device without any conversions
plughw:CARD=sndrpihifiberry,DEV=0
snd_rpi_hifiberry_dac,
Hardware device with all software conversions
Interesting is "top":
crossfeed disabled 12%
crossfeed enabled 19%
tobbes