Audio interface mixing scripts

scripts/aquamix.sh

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+#!/bin/bash
+
+# Script to manuage audio mixing the the main audio interface.
+
+# Import library
+source $(dirname ${BASH_SOURCE[0]})/audio-lib.sh
+
+INTERFACE_NAME='Scarlett 18i20'
+INTERFACE_NUM=$(getCardNumber $INTERFACE_NAME)
+
+# Sets the volume levels of the first mono instrument.
+#
+# $1 monitor volume
+# $2 first headphone volume
+# $3 second headphone volume
+function setMonoOne() {
+    setMono $INTERFACE_NUM 1 $1 $2 $3
+}
+
+# Sets the volume levels of the second mono instrument.
+#
+# $1 monitor volume
+# $2 first headphone volume
+# $3 second headphone volume
+function setMonoTwo() {
+    setMono $INTERFACE_NUM 2 $1 $2 $3
+}
+
+# Sets the volume levels of the third mono instrument.
+#
+# $1 monitor volume
+# $2 first headphone volume
+# $3 second headphone volume
+function setMonoThree() {
+    setMono $INTERFACE_NUM 3 $1 $2 $3
+}
+
+# Sets the volume levels of the first stereo instrument.
+#
+# $1 monitor volume
+# $2 first headphone volume
+# $3 second headphone volume
+function setStereoOne() {
+    setStereo $INTERFACE_NUM 5 $1 $2 $3
+}
+
+# Sets the volume levels of the second stereo instrument.
+#
+# $1 monitor volume
+# $2 first headphone volume
+# $3 second headphone volume
+function setStereoTwo() {
+    setStereo $INTERFACE_NUM 7 $1 $2 $3
+}
+
+# Sets the volume levels of the studio microphone.
+#
+# $1 monitor volume
+# $2 first headphone volume
+# $3 second headphone volume
+function setMic() {
+    setMono $INTERFACE_NUM 4 $1 $2 $3
+}
+
+# Sets the volume levels of the computer.
+#
+# $1 monitor volume
+# $2 first headphone volume
+# $3 second headphone volume
+function setComputerAudio() {
+    setStereo $INTERFACE_NUM 17 $1 $2 $3
+}
+
+# Sets the volume levels of all instrument.
+#
+# $1 monitor volume
+# $2 first headphone volume
+# $3 second headphone volume
+function setInstruments() {
+    setMonoOne $1 $2 $3
+    setMonoTwo $1 $2 $3
+    setMonoThree $1 $2 $3
+    setStereoOne $1 $2 $3
+    setStereoTwo $1 $2 $3
+}
+
+setInstruments $ZERO_DB
+setMic $MUTE
+setComputerAudio $ZERO_DB

scripts/audio-lib.sh

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+# Mix names
+MONITOR_LEFT='A'
+MONITOR_RIGHT='B'
+HEADPHONE_01_LEFT='C'
+HEADPHONE_01_RIGHT='D'
+HEADPHONE_02_LEFT='E'
+HEADPHONE_02_RIGHT='F'
+BLANK_LEFT="G"
+BLANK_RIGHT='H'
+
+# Level constants
+MUTE='0'
+ZERO_DB='0db'
+
+# Formats a number to match the matrix numbering.
+function formatMatrixNum() {
+    printf "%02d" $1
+}
+
+# Returns audio card number with matching card name.
+function getCardNumber() {
+    echo $(cat /proc/asound/cards | grep -m 1 $1 | grep -Po '\d{1,2}' | head -1)
+}
+
+# Prints a list of all controls for the given sound card.
+function printControls() {
+    amixer -c $1 controls
+}
+
+# Sets a mix to a level.
+#
+# $1 card number
+# $2 matrix number
+# $3 mix channel
+function setMix() {
+    amixer -c $1 set "Matrix $(formatMatrixNum $2) Mix $3" $4
+}
+
+
+# Sets the volume levels for a mono mix.
+#
+# $1 card number
+# $2 matrix number
+# $3 mix left channel
+# $4 mix right channel
+# $5 volume
+function setMonoMix() {
+    setMix $1 $2 $3 $5
+    setMix $1 $2 $4 $5
+}
+
+# Sets the volume levels for a stereo mix.
+#
+# $1 card number
+# $2 matrix number
+# $3 mix left channel
+# $4 mix right channel
+# $5 volume
+function setStereoMix() {
+    matrix=$2
+    setMix $1 $matrix       $3 $5
+    setMix $1 $matrix       $4 $MUTE
+    setMix $1 $((matrix+1)) $3 $MUTE
+    setMix $1 $((matrix+1)) $4 $5
+}
+
+
+# Sets the volume levels for a mono mix for several outputs.
+#
+# $1 card number
+# $2 matrix number
+# $3 mix left channel
+# $4 mix right channel
+# $5 monitor volume
+# $6 first headphone volume
+# $7 second headphone volume
+function setMono() {
+    monitor=$3
+    headphone1=$4
+    headphone2=$5
+    if [ -n $headphone1 ]; then headphone1=$monitor; fi
+    if [ -n $headphone2 ]; then headphone2=$monitor; fi
+    setMonoMix $1 $2 $MONITOR_LEFT      $MONITOR_RIGHT      $monitor
+    setMonoMix $1 $2 $HEADPHONE_01_LEFT $HEADPHONE_01_RIGHT $headphone1
+    setMonoMix $1 $2 $HEADPHONE_02_LEFT $HEADPHONE_02_RIGHT $headphone2
+    setMonoMix $1 $2 $BLANK_LEFT        $BLANK_RIGHT        $MUTE
+}
+
+# Sets the volume levels for a stereo mix for several outputs.
+#
+# $1 card number
+# $2 matrix number
+# $3 mix left channel
+# $4 mix right channel
+# $5 monitor volume
+# $6 first headphone volume
+# $7 second headphone volume
+function setStereo() {
+    monitor=$3
+    headphone1=$4
+    headphone2=$5
+    if [ -n $headphone1 ]; then headphone1=$monitor; fi
+    if [ -n $headphone2 ]; then headphone2=$monitor; fi
+    setStereoMix $1 $2 $MONITOR_LEFT      $MONITOR_RIGHT      $monitor
+    setStereoMix $1 $2 $HEADPHONE_01_LEFT $HEADPHONE_01_RIGHT $headphone1
+    setStereoMix $1 $2 $HEADPHONE_02_LEFT $HEADPHONE_02_RIGHT $headphone2
+    setStereoMix $1 $2 $BLANK_LEFT        $BLANK_RIGHT        $MUTE
+}