python实现录音小程序

本文为大家分享了python实现录音小程序的具体代码，供大家参考，具体内容如下

学习目标：掌握python的pyaudio扩展包和Wave模块录制语音的方法

• Wav音频:声道数，采样频率，量化位数
  

python Wav包是自带的，pyaudio需要下载

pip3 install pyaudio

python读Wav文件：

fp=wave.open('','rb')
  nf=fp.getnframes()#获取文件的采样点数量
  print('sampwidth:',fp.getsampwidth())
  print('framerate:',fp.getframerate())
  print('channels:',fp.getnchannels())
  f_len=nf*2#文件长度计算，每个采样2个字节
  audio_data=fp.readframes(nf)

python写Wav文件：

def save_wave_file(filename,data):
  '''save the date to the wavfile'''
  wf=wave.open(filename,'wb')
  wf.setnchannels(channels)#声道
  wf.setsampwidth(sampwidth)#采样字节 1 or 2
  wf.setframerate(framerate)#采样频率 8000 or 16000
  wf.writeframes(b"".join(data))#https://stackoverflow.com/questions/32071536/typeerror-sequence-item-0-expected-str-instance-bytes-found
  wf.close()

利用PyAudio录音：

def my_record():
  pa=PyAudio()
  stream=pa.open(format = paInt16,channels=1,
          rate=framerate,input=True,
          frames_per_buffer=NUM_SAMPLES)
  my_buf=[]
  count=0
  while count<TIME*20:#控制录音时间
    string_audio_data = stream.read(NUM_SAMPLES)#一次性录音采样字节大小
    my_buf.append(string_audio_data)
    count+=1
    print('.')
  save_wave_file('01.wav',my_buf)
  stream.close()

利用PyAudio播放音频

chunk=2014
def play():
  wf=wave.open(r"01.wav",'rb')
  p=PyAudio()
  stream=p.open(format=p.get_format_from_width(wf.getsampwidth()),channels=
  wf.getnchannels(),rate=wf.getframerate(),output=True)
  while True:
    data=wf.readframes(chunk)
    if data=="":break
    stream.write(data)
  stream.close()
  p.terminate()

完整录音播放的demo

import wave
from pyaudio import PyAudio,paInt16

framerate=8000
NUM_SAMPLES=2000
channels=1
sampwidth=2
TIME=2
def save_wave_file(filename,data):
  '''save the date to the wavfile'''
  wf=wave.open(filename,'wb')
  wf.setnchannels(channels)
  wf.setsampwidth(sampwidth)
  wf.setframerate(framerate)
  wf.writeframes(b"".join(data))
  wf.close()

def my_record():
  pa=PyAudio()
  stream=pa.open(format = paInt16,channels=1,
          rate=framerate,input=True,
          frames_per_buffer=NUM_SAMPLES)
  my_buf=[]
  count=0
  while count<TIME*20:#控制录音时间
    string_audio_data = stream.read(NUM_SAMPLES)
    my_buf.append(string_audio_data)
    count+=1
    print('.')
  save_wave_file('01.wav',my_buf)
  stream.close()

chunk=2014
def play():
  wf=wave.open(r"01.wav",'rb')
  p=PyAudio()
  stream=p.open(format=p.get_format_from_width(wf.getsampwidth()),channels=
  wf.getnchannels(),rate=wf.getframerate(),output=True)
  while True:
    data=wf.readframes(chunk)
    if data=="":break
    stream.write(data)
  stream.close()
  p.terminate()

if __name__ == '__main__':
  my_record()
  print('Over!') 
  play()

更多用法详见 pyaudio文档