Python对wav文件的重采样实例

例如从2channel，4.41k hz 重采样到 1 channel，16k hz

def downsampleWav(src, dst, inrate=44100, outrate=16000, inchannels=2, outchannels=1):
 import os,wave,audioop
 if not os.path.exists(src):
  print ('Source not found!')
  return False

 if not os.path.exists(os.path.dirname(dst)):
  os.makedirs(os.path.dirname(dst))

 try:
  s_read = wave.open(src, 'r')
  s_write = wave.open(dst, 'w')
 except:
  print ('Failed to open files!')
  return False

 n_frames = s_read.getnframes()
 data = s_read.readframes(n_frames)

 try:
  converted = audioop.ratecv(data, 2, inchannels, inrate, outrate, None)
  if outchannels == 1:
   converted = audioop.tomono(converted[0], 2, 1, 0)
 except:
  print ('Failed to downsample wav')
  return False

 try:
  s_write.setparams((outchannels, 2, outrate, 0, 'NONE', 'Uncompressed'))
  s_write.writeframes(converted)
 except:
  print ('Failed to write wav')
  return False

 try:
  s_read.close()
  s_write.close()
 except:
  print ('Failed to close wav files')
  return False

 return True

若in和out都是单通道：

def downsampleWav(src, dst, inrate=48000, outrate=16000, inchannels=1, outchannels=1):
 import os,wave,audioop
 if not os.path.exists(src):
  print ('Source not found!')
  return False

 if not os.path.exists(os.path.dirname(dst)):
  os.makedirs(os.path.dirname(dst))

 try:
  s_read = wave.open(src, 'rb')
  params = s_read.getparams()
  nchannels, sampwidth, framerate, nframes = params[:4]
  print(nchannels,sampwidth, framerate,nframes)
  s_write = wave.open(dst, 'wb')
 except:
  print ('Failed to open files!')
  return False

 n_frames = s_read.getnframes()
 data = s_read.readframes(n_frames)

 try:
  converted = audioop.ratecv(data, 2, inchannels, inrate, outrate, None)
  if outchannels == 1 and inchannels != 1:
   converted = audioop.tomono(converted[0], 2, 1, 0)
 except:
  print ('Failed to downsample wav')
  return False

 try:
  s_write.setparams((outchannels, 2, outrate, 0, 'NONE', 'Uncompressed'))
  s_write.writeframes(converted[0])
 except Exception as e:
  print(e)
  print ('Failed to write wav')
  return False

 try:
  s_read.close()
  s_write.close()
 except:
  print ('Failed to close wav files')
  return False

 return True

方案二

y为下采样的结果，类型np.ndarray

You can use Librosa's load() function,

import librosa
y, s = librosa.load('test.wav', sr=8000) # Downsample 44.1kHz to 8kHz

The extra effort to install Librosa is probably worth the peace of mind.

Pro-tip: when installing Librosa on Anaconda, you need to install ffmpeg as well, so

pip install librosa
conda install -c conda-forge ffmpeg

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