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#!/bin/sh
#
# "Free Software Song" player
#
# Copyright (C) 2016 Patrick "P. J." McDermott
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
play()
{
local octave_shift="${1}"
local note_length="${2}"
shift 2
local note=
local octave=
local length=
local freq=
while [ ${#} -gt 0 ]; do
note="${1%_*}"
octave="${1%:*}"
octave="${octave#*_}"
length="${1#*:}"
shift 1
case "${note}" in
C) note=-9;;
Cs|Df) note=-8;;
D) note=-7;;
Ds|Ef) note=-6;;
E) note=-5;;
F) note=-4;;
Fs|Gf) note=-3;;
G) note=-2;;
Gs|Af) note=-1;;
A) note=0;;
As|Bf) note=1;;
B) note=2;;
esac
# A note's frequency is:
# n/12
# f = 2 * 440 Hz
# where n is the distance from A4.
freq=$(awk -v octave_shift=${octave_shift} -v octave=${octave} \
-v note=${note} '
BEGIN {
octaves = octave_shift + octave - 4 + note / 12;
freq = 2 ^ octaves * 440;
print(int(freq + 0.5));
}
')
length=$(($length * $note_length))
beep -f ${freq} -l ${length}
done
}
# "Free Software Song"
#
# Time signature: 7/8
# Octaves: 4, 5
# Tempo: 252 BPM
# Duration: 0:20
#
# The notation for the "Free Software Song" is from
# <https://www.gnu.org/music/free-software-song.html>.
play 4 238 \
D_1:2 C_1:1 B_0:2 A_0:2 \
B_0:2 C_1:1 B_0:1 A_0:1 G_0:2 \
G_0:3 A_0:3 B_0:1 \
C_1:3 B_0:2 B_0:1 D_1:1 \
A_0:3 A_0:4 \
D_1:2 C_1:1 B_0:4 \
\
D_1:2 C_1:1 B_0:2 A_0:2 \
B_0:2 C_1:1 B_0:1 A_0:1 G_0:2 \
G_0:3 A_0:3 B_0:1 \
C_1:3 B_0:2 B_0:1 D_1:1 \
A_0:3 A_0:4 \
A_0:7
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