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soundrecorder.py
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soundrecorder.py
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import alsaaudio
import time, threading, Queue
import numpy as np
from sounddecoder import *
from convertions import list2string
from hamming import Hammingcorrector, Hammingdecoder
from baudot import decodeBaudot
import logging
logging.basicConfig(level=logging.INFO)
MAX_FREQUENCY = 10000
SAMPLE_RATE = 50
MAX_DURATION = 3.5
RATE = 44100
SND = Queue.Queue(maxsize=0)
BLOCKS = ''
class Recorder(object):
def __init__(self):
self.channels = 1
self.rate = RATE
self.low_threshold = 0.
self.raw_data = SND
self.blocks = BLOCKS
self.size = 441
self.pipeline = Queue.Queue(maxsize=0)
self.hanning = windowing(100, 100)
self.event = threading.Event()
def _setThreshold(self):
self.stream = alsaaudio.PCM(alsaaudio.PCM_CAPTURE, alsaaudio.PCM_NORMAL, 'default')
self.stream.setchannels(self.channels)
self.stream.setformat(alsaaudio.PCM_FORMAT_S16_LE)
self.stream.setrate(self.rate)
self.stream.setperiodsize(self.size)
for i in xrange(10):
l, snddata = self.stream.read()
try:
self.low_threshold += self.getAmplitude(snddata)
except TypeError:
pass
self.low_threshold = self.low_threshold/10
logging.info(self.low_threshold)
return self.low_threshold
def getAmplitude(self, snddata):
#l, snddata = self.stream.read()
try:
piece = np.fromstring(snddata, np.int16)
peak = np.max(piece)
amplitude = peak / 32768.
return amplitude
except ValueError:
pass
def getFrequency(self, snddata):
#l, snddata = self.stream.read()
try:
piece = np.fromstring(snddata, np.int16)
sp = np.fft.fft(piece)
freqs = np.fft.fftfreq(len(sp))
idx = np.argmax(np.abs(sp))
peak = freqs[idx]
freqency = int(abs(peak*RATE))
#logging.info(freqency)
return freqency
except ValueError:
pass
def openStream(self):
self.stream = alsaaudio.PCM(alsaaudio.PCM_CAPTURE, alsaaudio.PCM_NONBLOCK, 'default')
self.stream.setchannels(self.channels)
self.stream.setformat(alsaaudio.PCM_FORMAT_S16_LE)
self.stream.setrate(self.rate)
self.stream.setperiodsize(882)
self.nothing = 0
self.something = 0
while 1:
#time.sleep(.01)
l, snddata = self.stream.read()
#logging.info(self.getFrequency(snddata))
#logging.info(f)
if l:
if self.getAmplitude(snddata) >= self.low_threshold * 1.3:
#logging.info(self.getFrequency(snddata))
self.something += 1
self.nothing = 0
self.raw_data.put(snddata)
#logging.info('live long')
if self.something >= 1000:
self._setThreshold()
self.something = 0
self.nothing = 0
elif self.getAmplitude(snddata) <= self.low_threshold * 0.7:
self.nothing += 1
self.something = 0
if self.nothing >= 500:
self._setThreshold()
self.nothing = 0
self.something = 0
def _openStream(self, event):
self.stream = alsaaudio.PCM(alsaaudio.PCM_CAPTURE, alsaaudio.PCM_NONBLOCK, 'default')
self.stream.setchannels(self.channels)
self.stream.setformat(alsaaudio.PCM_FORMAT_S16_LE)
self.stream.setrate(self.rate)
self.stream.setperiodsize(882)
self.nothing = 0
self.something = 0
# IS THIS RIGHT???
while not event.isSet():
event.wait()
while 1:
time.sleep(.01)
l, snddata = self.stream.read()
#logging.info(self.getFrequency(snddata))
#logging.info(f)
if l:
if self.getAmplitude(snddata) >= self.low_threshold * 1.3:
#logging.info(self.getFrequency(snddata))
self.something += 1
self.nothing = 0
self.raw_data.put(snddata)
#logging.info('live long')
if self.something >= 1000:
self._setThreshold()
self.something = 0
self.nothing = 0
elif self.getAmplitude(snddata) <= self.low_threshold * 0.7:
self.nothing += 1
self.something = 0
if self.nothing >= 500:
self._setThreshold()
self.nothing = 0
self.something = 0
def _run(self):
stream_thread = threading.Thread(target=self.openStream, args=(self.event,))
stream_thread.daemon = True
stream_thread.start()
self._setThreshold()
self.record()
logging.info('threads begin')
stream_thread.join()
def run(self):
self._setThreshold()
stream_thread = threading.Thread(target=self.openStream)
stream_thread.daemon = True
stream_thread.start()
self.record()
logging.info('threads begin')
stream_thread.join()
def record(self):
while 1:
time.sleep(.01)
if not self.raw_data.empty():
block = self.raw_data.get()
self.blocks += block
#logging.info('and prosper')
samples = np.fromstring(self.blocks, np.int16)
if len(samples) >= self.rate * MAX_DURATION:
self.blocks = ''
self.pipeline.put(samples)
logging.info('put in pipe')
self.decode()
else:
time.sleep(.01)
def decode(self):
time.sleep(.01)
logging.info('begin decoding')
samples = self.pipeline.get()
l = []
filtered = butterworth(samples, 'high')
logging.info('filtering done')
smoothed = savitzkyFilter(samples, 11, 6)
logging.info('smoothing done')
data_diff = differ(smoothed)
logging.info('differing done')
#envelope = detectEnvelope(data_diff)
#logging.info('detecting done')
envelope = np.abs(data_diff)
logging.info('abs done')
data_out = lowPassFilter(self.hanning, 1.0, envelope)
logging.info('low pass done')
mean = np.mean(data_out)
sig = data_out[MAX_FREQUENCY/SAMPLE_RATE*2:len(data_out):MAX_FREQUENCY/SAMPLE_RATE*4]
for bit in sig:
l.append(0 if bit > mean else 1)
bits = list2string(l)
logging.info(bits)
try:
logging.info('Hamming process')
corrected = Hammingcorrector(bits)
de = Hammingdecoder(corrected)
logging.info(de)
return decodeBaudot(de)
except IndexError:
logging.info('Index Error')
if __name__ == '__main__':
mic = Recorder()
mic.run()