Python對wav文件的重采樣實例

更新時間：2020年02月25日 10:04:31 作者：AYE89

今天小編就為大家分享一篇Python對wav文件的重采樣實例，具有很好的參考價值，希望對大家有所幫助。一起跟隨小編過來看看吧

例如從2channel，4.41k hz 重采樣到 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都是單通道：

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為下采樣的結果，類型np.ndarray

You can use Librosa's load() function,