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name: build | ||
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on: | ||
push: | ||
branches: | ||
- build | ||
jobs: | ||
build: | ||
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env: | ||
BUILD_TYPE: Release | ||
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runs-on: ubuntu-latest | ||
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steps: | ||
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- name: Prepare | ||
run: | | ||
sudo apt-get update | ||
sudo apt-get install libpulse-dev libasound2-dev libjack-dev locate | ||
- name: Checkout | ||
uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9 | ||
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- name: Configure | ||
run: | | ||
mkdir dependencies | ||
mkdir local | ||
cd dependencies | ||
git clone https://github.com/thestk/rtaudio.git -b 5.2.0 | ||
cd rtaudio | ||
./autogen.sh | ||
./configure --prefix=$PWD/../../local | ||
make | ||
make check | ||
make install | ||
cd .. | ||
export LD_LIBRARY_PATH=$PWD/local/lib/:$LD_LIBRARY_PATH | ||
sudo ldconfig | ||
sudo updatedb | ||
- name: Build | ||
run: | | ||
mkdir build | ||
cd build | ||
cmake -DCMAKE_BUILD_TYPE=$BUILD_TYPE .. | ||
make | ||
- uses: actions/upload-artifact@0b7f8abb1508181956e8e162db84b466c27e18ce | ||
with: | ||
name: binaries | ||
path: | | ||
build/chimes | ||
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build/ | ||
deps/ | ||
local/ |
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cmake_minimum_required(VERSION 3.16.3) | ||
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project(chimes) | ||
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set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} -s") | ||
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include_directories(include local/include) | ||
link_directories(local/lib) | ||
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add_compile_options(-Wall -fPIC) | ||
set(LIBS librtaudio.a m dl pthread stdc++ | ||
pulse pulse-simple asound jack) | ||
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add_executable(chimes src/chimes.c src/main.c) | ||
target_link_libraries(chimes ${LIBS}) | ||
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MIT License | ||
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Copyright (c) 2021 mryndzionek@gmail.com | ||
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Permission is hereby granted, free of charge, to any person obtaining a copy | ||
of this software and associated documentation files (the "Software"), to deal | ||
in the Software without restriction, including without limitation the rights | ||
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
copies of the Software, and to permit persons to whom the Software is | ||
furnished to do so, subject to the following conditions: | ||
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The above copyright notice and this permission notice shall be included in all | ||
copies or substantial portions of the Software. | ||
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | ||
SOFTWARE. |
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# chimes | ||
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Procedural wind chimes sound simulator in C. | ||
Based on the article: | ||
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> "*Modal Synthesis of Wind Chime Sounds with Stochastic | ||
> Event Triggering*" by Teemu Lukkari and Vesa Välimäki, 2004 | ||
![plots](python/plots.png) | ||
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Audio output thanks to [RtAudio](https://www.music.mcgill.ca/~gary/rtaudio/). | ||
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## Building | ||
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``` | ||
mkdir deps | ||
cd deps | ||
git clone https://github.com/thestk/rtaudio.git -b 5.2.0 | ||
cd rtaudio | ||
./autogen.sh | ||
./configure --prefix=$PWD/../../local | ||
make | ||
make check | ||
make install | ||
cd ../.. | ||
mkdir build | ||
cd build | ||
cmake .. | ||
make | ||
``` | ||
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## Running | ||
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``` | ||
./chimes | ||
``` | ||
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You should hear [wind chimes](python/wav/chimes.wav) triggered by simulated random wind gust. |
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#ifndef _CHIMES_H_ | ||
#define _CHIMES_H_ | ||
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#define SAMPLERATE (11025) | ||
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typedef struct _chime_t chime_t; | ||
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chime_t *chime_init(void); | ||
float chime_update(chime_t *chime); | ||
bool chime_is_finished(chime_t *chime); | ||
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#endif // _CHIMES_H_ |
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import math | ||
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import numpy as np | ||
import matplotlib.pyplot as plt | ||
import scipy.signal as sig | ||
from scipy.io.wavfile import write as wav_write | ||
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# An attempt at recreating the results from the paper: | ||
# "Modal Synthesis of Wind Chime Sounds with Stochastic | ||
# Event Triggering" by Teemu Lukkari and Vesa Välimäki | ||
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FS = 11025 # [Hz] | ||
TS = 1 / FS # [s] | ||
END_TIME = 25.0 # [s] | ||
N_BELLS = 5 | ||
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T_60 = [40, 7, 2, 1, 0.5] | ||
assert(len(T_60) == N_BELLS) | ||
Rs = list(map(lambda t: math.pow(1e-6, 1 / (t * FS)), T_60)) | ||
Gs = [0.0787, 0.1849, 1.0000, 0.0136, 0.0275] | ||
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# modes for 5 tubes | ||
MODES = [[219.8, 590.2, 1115.4, 1766.2, 2513.9], | ||
[245.8, 657.6, 1239.2, 1955.3, 2773.1], | ||
[293.9, 782.4, 1465.2, 2311.8, 3278.8], | ||
[331.6, 875.5, 1633.0, 2576.5, 3654.2], | ||
[366.1, 967.5, 1794.2, 2831.0, 4015.1]] | ||
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assert(len(MODES) == N_BELLS) | ||
assert(len(Rs) == N_BELLS) | ||
assert(len(Gs) == N_BELLS) | ||
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class Trigger: | ||
def __init__(self, n_bells): | ||
self.n_bells = n_bells | ||
self.s_low = round(0.03 / TS) | ||
self.s_high = round(0.05 / TS) | ||
self.next_s = 0 | ||
self.state = 0 | ||
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def update(self, n): | ||
p = hit_prob(energy(n)) | ||
if n == self.next_s: | ||
if self.state == 0: | ||
ps = [1 - p] + ([p / self.n_bells] * self.n_bells) | ||
self.state = np.random.choice(np.arange(0, self.n_bells + 1), | ||
p=ps) | ||
else: | ||
cs = [0, self.state - 1 if self.state > 1 else self.n_bells, | ||
self.state + 1 if self.state < self.n_bells else 1] | ||
ps = [1 - p, p / 2, p / 2] | ||
self.state = np.random.choice(cs, p=ps) | ||
self.next_s = n + \ | ||
np.random.choice(range(self.s_low, self.s_high + 1, 1)) | ||
return self.state | ||
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class BurstGen: | ||
def __init__(self): | ||
self.R_input = 0.97 | ||
self.E = 0.0 | ||
self.start = 0 | ||
self.n = 0 | ||
self.active = False | ||
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def update(self, n): | ||
self.n = n | ||
a = math.sqrt(self.E + 0.1) | ||
if self.active: | ||
if (n - self.start) <= (0.02 / TS): | ||
d = a * math.pow(self.R_input, n - self.start) | ||
s = np.random.uniform(-1, 1, 1)[0] | ||
return s * d | ||
else: | ||
self.active = False | ||
return 0.0 | ||
else: | ||
return 0.0 | ||
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def reset(self, E): | ||
self.E = E | ||
self.start = self.n | ||
self.active = True | ||
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def wind(t): | ||
if t < 2: | ||
return 0.0 | ||
elif t < 10: | ||
return 2 * (t - 2) / 8 | ||
elif t < 20: | ||
return 2.0 | ||
else: | ||
return 0.0 | ||
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def energy(n): | ||
Rdec = 0.9999 | ||
dn = TS * wind((n - 1) * TS) | ||
En = Rdec * (energy.En_prev + dn) | ||
energy.En_prev = En | ||
return En | ||
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def hit_prob(e): | ||
return 1.0 / (1 + (99 * math.exp(-2 * e))) | ||
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def resonator_coefs(modes): | ||
fs = [] | ||
for i, f in enumerate(modes): | ||
R = Rs[i] | ||
G = Gs[i] | ||
cos_theta = math.cos(2 * math.pi * f / FS) * (2 * R) / (1 + (R * R)) | ||
sin_theta = math.sqrt(1 - (cos_theta * cos_theta)) | ||
A_zero = (1 + (R * R)) * sin_theta | ||
b_s = [A_zero * G, 0.0, -A_zero * G] | ||
a_s = [1.0, -2 * R * cos_theta, R * R] | ||
fs.append((b_s, a_s)) | ||
return fs | ||
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time = np.arange(0, END_TIME, TS) | ||
wnd_s = np.array(list(map(wind, time))) | ||
energy.En_prev = 0 | ||
en = list(map(energy, range(len(time)))) | ||
h_prob = list(map(hit_prob, en)) | ||
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trigger = Trigger(N_BELLS) | ||
strikes = [] | ||
energy.En_prev = 0 | ||
for i in range(len(time)): | ||
s = trigger.update(i) | ||
strikes.append(s) | ||
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fig, (ax1, ax2, ax3, ax4) = plt.subplots(4) | ||
ax1.grid(True) | ||
ax2.grid(True) | ||
ax3.grid(True) | ||
ax4.grid(True) | ||
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ax1.plot(time, wnd_s) | ||
ax2.plot(time, en) | ||
ax3.plot(time, h_prob) | ||
ax4.plot(time, strikes) | ||
plt.xlabel("time [s]") | ||
plt.show() | ||
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for i, m in enumerate(MODES): | ||
n = round(1.0 / TS) | ||
bg = BurstGen() | ||
bg.reset(0.2) | ||
brst = [] | ||
for j in range(n): | ||
brst.append(bg.update(j)) | ||
output = np.zeros(n) | ||
fs = resonator_coefs(m) | ||
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for f in fs: | ||
output += sig.lfilter(f[0], f[1], brst) | ||
output /= len(fs) | ||
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# save the synthesized tube samples | ||
wav_write("wav/tube_{}.wav".format(i + 1), FS, output) | ||
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chimes = np.zeros(len(strikes)) | ||
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for n in range(N_BELLS): | ||
bell_n = list(map(lambda s: s == n + 1, strikes)) | ||
bg = BurstGen() | ||
brsts = [] | ||
prev_s = False | ||
for i, s in enumerate(bell_n): | ||
if s and (prev_s != s): | ||
bg.reset(en[i]) | ||
brsts.append(bg.update(i)) | ||
prev_s = s | ||
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output = np.zeros(len(bell_n)) | ||
fs = resonator_coefs(MODES[n]) | ||
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for i, f in enumerate(fs): | ||
output += sig.lfilter(f[0], f[1], brsts) | ||
# print("static const float T{}_B{}[{}] = {{ {} }};".format( | ||
# n + 1, i + 1, len(f[0]), ", ".join(list(map(str, f[0]))))) | ||
# print("static const float T{}_A{}[{}] = {{ {} }};".format( | ||
# n + 1, i + 1, len(f[1]), ", ".join(list(map(str, f[1]))))) | ||
# print("") | ||
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chimes += output / (N_BELLS * len(fs)) | ||
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wav_write("wav/chimes.wav", FS, chimes * 0.9) |
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