record.py

# для установки pyaudio
# pip install --global-option='build_ext' --global-option='-I/usr/local/include' --global-option='-L/usr/local/lib' pyaudio

from sys import byteorder
from array import array
from struct import pack

import pyaudio
import wave

THRESHOLD = 500
CHUNK_SIZE = 4096
FORMAT = pyaudio.paInt16
RATE = 44100

def is_silent(snd_data):
 "Returns 'True' if below the 'silent' threshold"
 return max(snd_data) < THRESHOLD

def normalize(snd_data):
 "Average the volume out"
 MAXIMUM = 16384
 times = float(MAXIMUM)/max(abs(i) for i in snd_data)

 r = array('h')
 for i in snd_data:
 r.append(int(i*times))
 return r

def trim(snd_data):
 "Trim the blank spots at the start and end"
 def _trim(snd_data):
 snd_started = False
 r = array('h')

 for i in snd_data:
 if not snd_started and abs(i)>THRESHOLD:
 snd_started = True
 r.append(i)

 elif snd_started:
 r.append(i)
 return r

 # Trim to the left
 snd_data = _trim(snd_data)

 # Trim to the right
 snd_data.reverse()
 snd_data = _trim(snd_data)
 snd_data.reverse()
 return snd_data

def add_silence(snd_data, seconds):
 "Add silence to the start and end of 'snd_data' of length 'seconds' (float)"
 r = array('h', [0 for i in range(int(seconds*RATE))])
 r.extend(snd_data)
 r.extend([0 for i in range(int(seconds*RATE))])
 return r

def record():
 """
 Record a word or words from the microphone and
 return the data as an array of signed shorts.

 Normalizes the audio, trims silence from the
 start and end, and pads with 0.5 seconds of
 blank sound to make sure VLC et al can play
 it without getting chopped off.
 """
 p = pyaudio.PyAudio()
 stream = p.open(format=FORMAT, channels=1, rate=RATE,
 input=True, output=True,
 frames_per_buffer=CHUNK_SIZE)

 num_silent = 0
 snd_started = False

 r = array('h')

 while 1:
 # little endian, signed short
 snd_data = array('h', stream.read(CHUNK_SIZE))
 if byteorder == 'big':
 snd_data.byteswap()
 r.extend(snd_data)

 silent = is_silent(snd_data)

 if silent and snd_started:
 num_silent += 1
 elif not silent and not snd_started:
 snd_started = True

 if snd_started and num_silent > 30:
 break

 sample_width = p.get_sample_size(FORMAT)
 stream.stop_stream()
 stream.close()
 p.terminate()

 r = normalize(r)
 r = trim(r)
 r = add_silence(r, 0.5)
 return sample_width, r

def record_to_file(path):
 "Records from the microphone and outputs the resulting data to 'path'"
 print("recording")
 sample_width, data = record()
 data = pack('<' + ('h'*len(data)), *data)

 wf = wave.open(path, 'wb')
 wf.setnchannels(1)
 wf.setsampwidth(sample_width)
 wf.setframerate(RATE)
 wf.writeframes(data)
 wf.close()


if __name__ == '__main__':
 print("please speak a word into the microphone")
 record_to_file('demo.wav')
 print("done - result written to demo.wav")