I have measured with all bands to 50 (i.e. zero I believe), but I see some heavy distortion occuring, see the graph at: http://s22.postimg.org/83akcymxd/metingen_io.jpg
The red one is measured with the input directly looped to the output of my pc, so the reference.
The green one is the signal via airfoil to the pi and then to the input of my pc.
I might be that the airfoil does some things here too, but i have to exclude that still.
btw. I got the 15 band working after installing the library from http://www.thedigitalmachine.net/alsaequal.html
and with the following code in setsound:
#!/bin/bash
MusicBox Sound configuration script
CONFIG_FILE=/boot/config/settings.ini
Define LSB log_* functions.
. /lib/lsb/init-functions
log_use_fancy_output
log_begin_msg "Setting sound configuration…"
rm -f /etc/asound.conf
I2S_CARD=
USB_CARD=
INT_CARD=
HDMI_CARD=
function enumerate_alsa_cards()
{
# Remove unwanted characters from argument.
i2s_NAME=$(echo $1 | tr -d “[:punct:]”)
while read -r line
do
## Dac
#card 0: sndrpihifiberry [snd_rpi_hifiberry_dac], device 0: HifiBerry DAC HiFi pcm5102a-hifi-0 []
## Digi
#card 2: sndrpihifiber_1 [snd_rpi_hifiberry_digi], device 0: HifiBerry Digi HiFi wm8804-spdif-0 []
## Dac+
#card 1: sndrpihifiber_1 [snd_rpi_hifiberry_dacplus], device 0: HiFiBerry DAC+ HiFi pcm512x-hifi-0 []
#IQaudIO
#card 1: sndrpiiqaudioda [snd_rpi_iqaudio_dac], device 0: IQaudIO DAC HiFi pcm512x-hifi-0 []
#card 1: IQaudIODAC [IQaudIODAC], device 0: IQaudIO DAC HiFi pcm512x-hifi-0 []
## Wolfson
#Card 0: sndrpiwsp [snd_rpi_wsp], device 0: WM5102 AiFi wm5102-aif1-0 []
## Onboard
#card 0: ALSA [bcm2835 ALSA], device 0: bcm2835 ALSA [bcm2835 ALSA]
#card 0: ALSA [bcm2835 ALSA], device 1: bcm2835 ALSA [bcm2835 IEC958/HDMI]
## USB
#card 2: AUDIO [USB AUDIO], device 0: USB Audio [USB Audio]
#card 2: DAC [USB Audio DAC], device 0: USB Audio [USB Audio]
#card 2: CODEC [USB Audio CODEC], device 0: USB Audio [USB Audio]
# Remove unwanted characters, make lowercase and split on whitespace.
line=$(echo $line | tr "[:upper:]" "[:lower:]" | tr -d "[:punct:]")
dev=($(echo $line))
card_num=${dev[1]}
name=${dev[3]}
if [[ $name == "bcm2835" ]]; then
INT_CARD=$card_num
log_progress_msg "Found internal device: card$INT_CARD"
if tvservice -s | grep -q HDMI; then
echo "HDMI output connected"
HDMI_CARD=$card_num
fi
elif [[ $i2s_NAME && $name == *"$i2s_NAME" ]]; then
I2S_CARD=$card_num
log_progress_msg "Found i2s device: card$I2S_CARD"
elif [[ $line =~ "usb audio" ]]; then
USB_CARD=$card_num
log_progress_msg "Found usb device: card$USB_CARD"
else
UNKNOWN_CARD=$card_num
log_progress_msg "Found unknown device: card$UNKNOWN_CARD"
fi
done < <(aplay -l | grep card)
# No usb card found, assume anything unknown is actually a usb card.
[[ -z $USB_CARD ]] && USB_CARD=$UNKNOWN_CARD
}
if [[ $INI_READ != true ]]
then
echo “read ini”
# Import ini parser
. /opt/musicbox/read_ini.sh
# Convert windows ini to unix
dos2unix -n $CONFIG_FILE /tmp/settings.ini > /dev/null 2>&1 || true
# ini vars to mopidy settings
read_ini /tmp/settings.ini
rm /tmp/settings.ini > /dev/null 2>&1 || true
fi
If output not defined, it will automatically detect USB / HDMI / Analog in given order
It is at this moment not possible to detect whether an i2s device is connected hence
i2s is only selected if explicitly given as output in the config file
OUTPUT=$(echo $INI__musicbox__output | tr “[:upper:]” “[:lower:]”)
CARD=
if [[ -z “$OUTPUT” ]]
then
OUTPUT="auto"
fi
Get alsa cards
enumerate_alsa_cards
case $OUTPUT in
analog)
CARD=$INT_CARD
;;
hdmi)
CARD=$HDMI_CARD
;;
usb)
CARD=$USB_CARD
;;
hifiberry_dac)
modprobe snd_soc_pcm5102a
modprobe snd_soc_hifiberry_dac
enumerate_alsa_cards $OUTPUT
CARD=$I2S_CARD
;;
hifiberry_digi)
modprobe snd_soc_wm8804
modprobe snd_soc_hifiberry_digi
enumerate_alsa_cards $OUTPUT
CARD=$I2S_CARD
;;
hifiberry_dacplus)
modprobe snd_soc_hifiberry_dacplus
enumerate_alsa_cards $OUTPUT
CARD=$I2S_CARD
;;
hifiberry_amp)
modprobe snd_soc_hifiberry_amp
enumerate_alsa_cards $OUTPUT
CARD=$I2S_CARD
;;
iqaudio_dac)
modprobe snd_soc_pcm512x
modprobe snd_soc_iqaudio_dac
enumerate_alsa_cards $OUTPUT
CARD=$I2S_CARD
;;
wolfson)
enumerate_alsa_cards wsp
CARD=$I2S_CARD
;;
esac
echo “Card $CARD i2s $I2S_CARD output $OUTPUT usb $USB_CARD intc $INT_CARD”
If preferred output not found or given fall back to auto detection
if [[ -z $CARD ]];
then
echo "No output was specified/found, falling back to auto detection"
if [[ -n $USB_CARD ]]; then
CARD=$USB_CARD
OUTPUT="usb"
else
CARD=$INT_CARD
if [[ -n $HDMI_CARD ]]; then
OUTPUT="hdmi"
else
OUTPUT="analog"
fi
fi
fi
echo “Card $CARD i2s $I2S_CARD output $OUTPUT usb $USB_CARD intc $INT_CARD”
if [[ -z $CARD ]];
then
log_failure_msg "No ouput card found"
exit 1
fi
log_progress_msg “Line out set to $OUTPUT card $CARD”
log_progress_msg “Generating alsa configuration file…”
if [ “$INI__musicbox__equalizer_profile” == “0” ]
then
cat << EOF > /etc/asound.conf
pcm.!default noequal;
EOF
else
cat << EOF > /etc/asound.conf
pcm.!default equal;
EOF
fi
if [ “$OUTPUT” == “usb” -a “$INI__musicbox__downsample_usb” == “1” ]
resamples to 44K because of problems with some usb-dacs on 48k (probably related to usb drawbacks of Pi)
and extra buffer for usb
then
cat << EOF >> /etc/asound.conf
pcm.plugequal {
library “/usr/lib/ladspa/mbeq_1197.so”;
module “mbeq”;
ipc_key 1024
controls "/home/mopidy/.alsaequal.bin"
slave.pcm {
“plughw:$CARD,0”;
rate 44100
period_time 0
period_size 4096
buffer_size 131072
}
}
pcm.noequal {
type dmix
ipc_key 1024
slave.pcm {
“plughw:$CARD,0”;
rate 44100
period_time 0
period_size 4096
buffer_size 131072
}
}
EOF
else
cat << EOF >> /etc/asound.conf
pcm.plugequal {
type equal;
library “/usr/lib/ladspa/mbeq_1197.so”;
module “mbeq”;
slave.pcm “plughw:$CARD,0”;
controls “/home/mopidy/.alsaequal.bin”
}
pcm.noequal {
type hw
card $CARD
}
EOF
fi
cat << EOF >> /etc/asound.conf
pcm.equal {
type plug
slave.pcm plugequal;
}
ctl.!default {
type hw
card $CARD
}
ctl.equal {
type equal;
library “/usr/lib/ladspa/mbeq_1197.so”;
module “mbeq”;
controls “/home/mopidy/.alsaequal.bin”
}
EOF
Reset mixer
amixer cset numid=3 0 > /dev/null 2>&1 || true
if [ “$OUTPUT” == “analog” ]
then
# Set mixer to analog output
amixer cset numid=3 1 > /dev/null 2>&1 || true
elif [ “$OUTPUT” == “hdmi” ]
then
# Set mixer to hdmi
amixer cset numid=3 2 > /dev/null 2>&1 || true
fi
for CTL in
Master
PCM
Line
“PCM,1”
Wave
Music
AC97
“Master Digital”
DAC
“DAC,0”
“DAC,1”
Speaker
Playback
Digital
Aux
Front
Center
do
# Set initial hardware volume
amixer set -c $CARD “$CTL” 96% unmute > /dev/null 2>&1 || true
#amixer set -c $CARD “$CTL” ${VOLUME}% unmute > /dev/null 2>&1 || true
done
Set PCM of Pi higher, because it’s really quiet otherwise (hardware thing)
amixer -c 0 set PCM playback 98% > /dev/null 2>&1 || true &
#amixer -c 0 set PCM playback ${VOLUME}% > /dev/null 2>&1 || true &
case $INI__musicbox__equalizer_profile in
"0" | “custom”)
# don’t do anything
;;
“default”)
rm /home/mopidy/.alsaequal.bin
;;
*)
log_progress_msg "Setting equalizer profile to ‘$INI__musicbox__equalizer_profile’"
sh /opt/musicbox/set_equalizer_preset.sh $INI__musicbox__equalizer_profile
;;
esac
log_end_msg
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