#!/bin/sh

# Performs an AB random load of 2 crossover configs
# running the number of times requested for the period
# requested between switches.  Uses a Text to speech package
# (flite) to "speak" the iteration being switched into the
# default ALSA device (e.g. "One, Two, Three etc...".
# It will drop the volume in MPD so you can hear the change
# Assumes the default ALSA device is a dmix device, thus
# will play merged in with the current song.
# When finished, it will restore the original Camilla DSP loaded
# The output for each test is written into /tmp so it can be
# checked after the test is done
#
# requires these packages for text to speech:
# festival
# festival-english
#
# or
#
# flite (quicker to run - recommended)
#
# Arguments (all are mandatory and no command line error checking):
# $1 = number of tests - that is times crossover config is to be switched
# $2 = duration of play between switches
# $3 = Y or N = Y repeats the section played each switch, N continues song
#      whilst switching
# $4 = fully qualified filename for Camilla DSP crossover #1
# $5 = fully qualified filename for Camilla DSP crossover #2
#
# eg:
# ab_test.sh 5 5 Y bps_r6.yml bps_r6_mid_only.yml
#
# runs 5 tests (switching between the 2 YAML files 5 times) with a 5 second period listening
# to each switch.  Y = reset the position (in MPD) back to the time the test started
# allowing subjects to hear the same "sample period".

OUTPUT_FILE="/tmp/ab_test_"`date +%Y-%m-%d\-%H\:%M\:%S`
#echo $OUTPUT_FILE
BASEDIR=$(dirname "$0")

if [ $3 == "Y" ]
then
    CURRENT_SONG_POS=`mpc | grep playing | cut -d' ' -f 5 | cut -d'/' -f 1`
fi

# save the config so we can restore it at end of test
ORIGINAL_CONFIG=`$BASEDIR/get_config.sh`

# To be doubly blind - we take the 2 crossovers in the
# command line and randomly assign them as the A and B
# so the person / caller has no idea which one is which
UPPER=2
LOWER=1
DIFF=$(($UPPER-$LOWER+1))
R=$(($(($RANDOM%$DIFF))+$LOWER))

CURR_VOLUME=`mpc volume | cut -d":" -f 2 | sed 's/\%//g'`

if [ $R = 1 ]
then
    FILE_A=$4
    FILE_B=$5
else
    FILE_A=$5
    FILE_B=$4
fi

for i in `seq $1`
do
    DIFF=$(($UPPER-$LOWER+1))
    R=$(($(($RANDOM%$DIFF))+$LOWER))
    if [ $R = 1 ]
    then
        TEST_FILE=$FILE_A
        TEST_CONFIG=A
    else
        TEST_FILE=$FILE_B
        TEST_CONFIG=B
    fi
    #echo "$i" | festival --tts
    echo "Test #$i: $TEST_CONFIG: $TEST_FILE" >> $OUTPUT_FILE
    mpc volume $(expr $CURR_VOLUME - 50)
    flite -t $i
    $BASEDIR/switch_config.sh $TEST_FILE
    mpc volume $CURR_VOLUME
    if [ ! -z $CURRENT_SONG_POS ]
    then
        mpc seek $CURRENT_SONG_POS
    fi
    sleep $2
done

$BASEDIR/switch_config.sh $ORIGINAL_CONFIG

Harmonic    Frequency     Fourier     Normalized     Phase      Normalized
 Number       [Hz]       Component     Component    [degree]    Phase [deg]
    1       1.000e+03    2.419e-01    1.000e+00      180.00°        0.00°
    2       2.000e+03    4.182e-04    1.729e-03       90.00°      -89.99°
    3       3.000e+03    3.841e-06    1.588e-05     -179.89°     -359.89°
    4       4.000e+03    3.074e-08    1.271e-07      -85.22°     -265.22°
    5       5.000e+03    2.164e-08    8.943e-08      -23.29°     -203.29°
    6       6.000e+03    1.286e-08    5.315e-08     -155.36°     -335.36°
    7       7.000e+03    2.308e-08    9.542e-08      114.68°      -65.32°
    8       8.000e+03    7.136e-09    2.950e-08      103.05°      -76.94°
    9       9.000e+03    1.315e-08    5.436e-08       12.36°     -167.64°
Total Harmonic Distortion: 0.172874%(0.172872%)

Harmonic    Frequency     Fourier     Normalized     Phase      Normalized
 Number       [Hz]       Component     Component    [degree]    Phase [deg]
    1       1.000e+03    2.407e+00    1.000e+00      180.00°        0.00°
    2       2.000e+03    4.321e-02    1.795e-02       90.00°      -89.99°
    3       3.000e+03    4.079e-03    1.694e-03     -179.99°     -359.99°
    4       4.000e+03    3.596e-04    1.494e-04      -90.01°     -270.01°
    5       5.000e+03    5.066e-05    2.104e-05        0.02°     -179.98°
    6       6.000e+03    4.319e-06    1.794e-06       90.10°      -89.90°
    7       7.000e+03    8.893e-07    3.694e-07     -179.53°     -359.53°
    8       8.000e+03    4.852e-08    2.015e-08      -88.82°     -268.82°
    9       9.000e+03    1.557e-08    6.466e-09       25.25°     -154.74°
Total Harmonic Distortion: 1.802813%(1.802812%)

wget \
     --recursive \
     --no-clobber \
     --page-requisites \
     --html-extension \
     --convert-links \
     --restrict-file-names=windows \
     --timeout=5 --waitretry=0 --tries=3 --retry-connrefused \
     --domains web.archive.org \
     --no-parent \
         http://web.archive.org/web/20090416222321/http://www.pacifier.com/~gpimm