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beatMatcher.py
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beatMatcher.py
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# Python 2.7 code to analyze sound and interface with Arduino
import numpy as np # from http://numpy.scipy.org/
import audioop
import sys
import math
import struct
from struct import unpack
import alsaaudio as aa
import time
import random
from programcontroller import Color
from pixel import *
from threading import Timer
'''
Sources
http://www.swharden.com/blog/2010-03-05-realtime-fft-graph-of-audio-wav-file-or-microphone-input-with-python-scipy-and-wckgraph/
http://macdevcenter.com/pub/a/python/2001/01/31/numerically.html?page=2
'''
class BeatMatcher():
def __init__(self, strip, pixels):
self.strip = strip
self.pixels = pixels
self.MAX = 0
self.sample_rate = 44100
self.no_channels = 1
self.chunk = 512 # Use a multiple of 8
self.window_length = 4
self.delay = 0.15
self.lighted = False
self.last_was_beat = False
self.lastColorId = 0
self.smoothMode = True
self.show_amplitude_bars = True
def fft(self, data, log_scale=False, div_by=100):
left, right = np.split(np.abs(np.fft.fft(data)), 2)
ys = np.add(left, right[::-1])
if log_scale:
ys = np.multiply(20, np.log10(ys))
if div_by:
ys = ys / float(div_by)
return ys
def list_devices(self):
# List all audio input devices
print aa.pcms()
def beatmatch(self):
beat_id = 0
counter = 0
avg_buffer = np.ones(self.window_length)
# Set up audio
data_in = aa.PCM(aa.PCM_CAPTURE, aa.PCM_NORMAL)
data_in.setchannels(self.no_channels)
data_in.setrate(self.sample_rate)
data_in.setformat(aa.PCM_FORMAT_S16_LE)
data_in.setperiodsize(self.chunk)
while True:
counter += 1
l,data = data_in.read()
#data_in.pause(1) # Pause capture whilst RPi processes data
if l:
# catch frame error
try:
npdata = np.fromstring(data,dtype='<i2')
xy = self.fft(npdata)
except:
pass
try:
bass_range = xy[0]
amplitude = np.linalg.norm(bass_range)
total_amplitude = np.linalg.norm(xy)
baseline = np.average(avg_buffer)
ratio = amplitude / baseline
isBass = False
if (ratio > 1.5) and amplitude > 100:
isBass = True
avg_buffer = np.roll(avg_buffer, 1)
avg_buffer[0] = amplitude
if isBass and not self.lighted:
#print 'Beat' + str(beat_id)
# Potential overflow possibility here
beat_id += 1
isBass = False
if self.smoothMode:
color = self.wheel(beat_id % 255)
else:
color = self.randomWheel()
p_idx = 0
for pixel in self.pixels:
# Don't light the big bars, use them for amplitude viz
if p_idx == 8 or p_idx == 9 and self.show_amplitude_bars:
continue
pixel.lightPixel(self.strip, color)
p_idx += 1
self.lighted = True
#self.strip.show()
t = Timer(self.delay, self.shutLights)
t.start()
elif isBass and self.lighted:
self.last_was_beat = True
else:
self.last_was_beat = False
# Set amplitude bars
level = int((14.0*total_amplitude) / 5000.0)
if level > 14:
level = 14
if counter % 4 == 0:
counter = 0
color = self.wheel(beat_id % 255)
self.setAmplitudeBars(self.pixels[8], 13, 19, 34, 40, level, color)
self.setAmplitudeBars(self.pixels[9], 21, 27, 0, 7, level, color)
self.strip.show()
except audioop.error, e:
print e
continue
time.sleep(0.005)
#data_in.pause(0) # Resume capture
def setAmplitudeBars(self, pxl, low, top, toprow_start, toprow_end, level, color):
# Approx 12 levels
# Bottom row:
if level > 0:
for idx in range(low, top+1):
pxl.lightIndividualLed(self.strip, idx, color)
# Side rows per level
for j in range(0, level):
top += 1
low -= 1
if low < 0:
low = 0
pxl.lightIndividualLed(self.strip, top, color)
pxl.lightIndividualLed(self.strip, low, color)
# If max level, light top row also
if level == 14:
for idx in range(toprow_start,toprow_end):
pxl.lightIndividualLed(self.strip, idx, color)
else:
for idx in range(toprow_start-1,toprow_end+1):
pxl.shutIndividualLed(self.strip, idx)
# hack for the last led in the strip (looks like top row but at the end on pixel #10)
pxl.shutIndividualLed(self.strip, pxl.count)
# Shut down others
for j in range(0, 13-level):
top += 1
low -= 1
pxl.shutIndividualLed(self.strip, top)
pxl.shutIndividualLed(self.strip, low)
def shutLights(self):
p_idx = 0
for pixel in self.pixels:
if (p_idx == 8 or p_idx == 9) and self.show_amplitude_bars:
break
pixel.shutPixel(self.strip)
p_idx += 1
self.strip.show()
self.lighted = False
def wheel(self, pos):
if pos < 85:
return Color(pos * 3, 255 - pos * 3, 0)
elif pos < 170:
pos -= 85
return Color(255 - pos * 3, 0, pos * 3)
else:
pos -= 170
return Color(0, pos * 3, 255 - pos * 3)
def randomWheel(self):
# Calculate new mean opposite on then circle
mu = self.lastColorId + 127 % 255
mu = float(mu) / 255.0
mu = mu * 2*np.pi - np.pi
newId = np.random.vonmises(mu, 1)
newId = int(np.floor((newId + np.pi) / (2*np.pi) * 255.0))
self.lastColorId = newId
return self.wheel(newId)