calibrate

#!/bin/bash -eu

export AUDIODRIVER=alsa
export AUDIODEV=hw:0,0

RATE=96000
FILE=cal.wav
VOL=${1:-0dB}
POLYDEG=${2:-5}
FREQ=${3:-1000}
REALFREQ=${4:-1000}
LEN=${5:-2}

if [[ "$LEN" != 0 ]]; then
	pasuspender sleep $((LEN+3)) || err=$? &
	sox -R -r $RATE -b 32 -c 2 -d "$FILE" trim 1 $LEN &
	sleep 0.5
	play -q -R -r $RATE -b 32 -n synth $((LEN+2)) sin $FREQ vol $VOL
	wait
fi

octave/gen_compen_polynom.m $FILE 1 $POLYDEG ${REALFREQ} q
octave/gen_compen_polynom.m $FILE 2 $POLYDEG ${REALFREQ} q

C1=$(grep -c "^pcm.calibrated_in.ttable.0.0 {.*}" ~/.asoundrc) || { echo "Error: missing ttable.0.0 line in .asoundrc" >&2; exit 1; }
C2=$(grep -c "^pcm.calibrated_in.ttable.1.1 {.*}" ~/.asoundrc) || { echo "Error: missing ttable.1.1 line in .asoundrc" >&2; exit 1; }

sed -i \
	-e "/^pcm.calibrated_in.ttable.0.0 {.*}/s/ .*/ { $(cat ${FILE%.wav}.polycoeff1) }/" \
	-e "/^pcm.calibrated_in.ttable.1.1 {.*}/s/ .*/ { $(cat ${FILE%.wav}.polycoeff2) }/" \
	~/.asoundrc

grep "^pcm.calibrated_in.ttable" ~/.asoundrc

# trigger .asoundrc reload on the next open of device
sudo touch /usr/share/alsa/alsa.conf