Created
February 23, 2011 19:50
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import pyaudio | |
import wave | |
import numpy as np | |
from contextlib import contextmanager | |
import math | |
p = pyaudio.PyAudio() | |
chunk = 1024*4 | |
FORMAT = pyaudio.paInt16 | |
CHANNELS = 1 | |
RATE = 44100 | |
@contextmanager | |
def audio_open(): | |
"""Context to be used with the with statement, it yields the audio stream | |
""" | |
stream = p.open(format = FORMAT, | |
channels = CHANNELS, | |
rate = RATE, | |
input = True, | |
#input_device_index=0, | |
#output = True, | |
frames_per_buffer = chunk) | |
try: | |
yield stream | |
except: | |
stream.close() | |
p.terminate() | |
raise | |
else: | |
stream.close() | |
p.terminate() | |
def listen(seconds, callback): | |
"""Listen for tot *seconds* from the default input for frequencies. | |
For each frequency it calls *callback* with the frequency as the only argument. | |
""" | |
with audio_open() as stream: | |
for i in range(0, RATE / chunk * seconds): | |
data = stream.read(chunk) | |
# use a Blackman window | |
window = np.blackman(chunk) | |
# find the frequency of each chunk | |
swidth = p.get_sample_size(FORMAT) | |
# unpack the data and times by the hamming window | |
indata = np.array(wave.struct.unpack("%dh"%(len(data)/swidth),\ | |
data))*window | |
# Take the fft and square each value | |
fftData=abs(np.fft.rfft(indata))**2 | |
# find the maximum | |
which = fftData[1:].argmax() + 1 | |
# use quadratic interpolation around the max | |
if which != len(fftData)-1: | |
y0,y1,y2 = np.log(fftData[which-1:which+2:]) | |
x1 = (y2 - y0) * .5 / (2 * y1 - y2 - y0) | |
# find the frequency and output it | |
thefreq = (which+x1)*RATE/chunk | |
callback(thefreq) | |
else: | |
thefreq = which*RATE/chunk | |
callback(thefreq) | |
# read some more data | |
data = stream.read(chunk) | |
def freq_to_notename_cent(freq): | |
e = 440.0 | |
if e > freq: | |
while e > freq: | |
e = e / 2 | |
else: | |
while e < freq/2: | |
e = e * 2 | |
d = freq / e | |
v = 12 * math.log(d) / math.log(2) | |
i = int(v) | |
cent = (v-i) * 100 | |
n = ('a', 'ais', 'b', 'c', 'cis', 'd', 'dis', 'e', 'f', 'fis', 'g', 'gis') | |
if cent > 50: | |
return n[(i+1) % 12], cent-100 | |
return n[int(v)], (v-int(v)) * 100 | |
def test(): | |
def cb(freq): | |
if 80<freq<1100: | |
print freq_to_notename_cent(freq), freq, 'Hz' | |
listen(10, cb) | |
if __name__ == '__main__': | |
import threading | |
threading.Thread(target=test).start() |
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import gtk,cairo,glib | |
import tellnote | |
import threading | |
gtk.gdk.threads_init() | |
class TunerThread(threading.Thread): | |
def __init__(self, widg): | |
super(TunerThread,self).__init__() | |
self.widg = widg | |
self.note = widg.note | |
def run(self): | |
tellnote.listen(20, self.on_freq) | |
def on_freq(self, freq): | |
if 80<freq<1200: | |
name,cent = tellnote.freq_to_notename_cent(freq) | |
if name == self.note: | |
glib.idle_add(self.update_gui, cent) | |
def update_gui(self, cent): | |
self.widg.cent = cent | |
print "Draw", cent | |
self.widg.queue_draw() | |
class Tuner(gtk.DrawingArea): | |
def __init__(self, label, note): | |
"""label: which label to display in the tuner | |
""" | |
super(Tuner, self).__init__() | |
self.set_size_request(200, 30) | |
self.label=label | |
self.connect('expose-event', self.expose) | |
self.cent=0 | |
self.note = note | |
TunerThread(self).start() | |
def expose(self, widget, event): | |
cr = widget.window.cairo_create() | |
cr.set_line_width(0.8) | |
cr.select_font_face('Sans', cairo.FONT_SLANT_NORMAL, | |
cairo.FONT_WEIGHT_NORMAL) | |
cr.set_font_size(20) | |
self._draw_bg(cr) | |
self._draw_line(cr, self.cent) | |
self._draw_text(cr) | |
def _draw_bg(self, cr): | |
cr.set_source_rgb(1.0, 1.0, 1.0) | |
cr.rectangle(0,0,self.allocation.width,30) | |
cr.paint() | |
cr.clip() | |
def _draw_text(self,cr): | |
(x, y, width, height, dx, dy) = cr.text_extents(self.label) | |
cr.set_source_rgb(0,0,0) | |
cr.move_to(100-(width/2 + x),15 - (height/2 + y)) | |
cr.show_text(self.label) | |
cr.stroke() | |
def _draw_line(self, cr, cents): | |
width = self.allocation.width | |
x = width/2 + cents/100*width | |
cr.set_source_rgb(0.81640625,0.81640625,0.81640625) | |
cr.set_line_width(10) | |
cr.set_line_cap(cairo.LINE_CAP_ROUND) | |
cr.move_to(x, 4) | |
cr.line_to(x, 26) | |
cr.stroke() | |
def test(): | |
win = gtk.Window() | |
win.add(Tuner('A', 'a')) | |
win.show_all() | |
win.connect('delete-event', lambda w,e: gtk.main_quit()) | |
gtk.main() | |
if __name__ == '__main__': | |
test() |
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