python对批量WAV音频进行等长分割的方法实现

对批量WAV音频进行等长分割

对WAV格式的音频以相同长度进行分割。

import os
import wave
import numpy as np
import pylab as plt
import librosa

path = r"D:\cutaudio\test"
files = os.listdir(path)
files = [path + "\\" + f for f in files if f.endswith('.wav')]
CutTime = 4 #单位长度4s

def CutAudios():
  for i in range(len(files)):
    FileName = files[i]
    f = wave.open(r"" + FileName, 'rb')
    params = f.getparams() #读取音频文件信息
    nchannels, sampwidth, framerate, nframes = params[:4] #声道数, 量化位数, 采样频率, 采样点数  
    str_data = f.readframes(nframes)
    f.close()
   
    wave_data = np.frombuffer(str_data, dtype=np.short)
    #根据声道数对音频进行转换
    if nchannels > 1:
        wave_data.shape = -1, 2
        wave_data = wave_data.T
        temp_data = wave_data.T
    else:
        wave_data = wave_data.T
        temp_data = wave_data.T

    CutFrameNum = framerate * CutTime 
    Cutnum =nframes/CutFrameNum #音频片段数
    StepNum = int(CutFrameNum)
    StepTotalNum = 0
  
    for j in range(int(Cutnum)):
      FileName = r"D:\cutaudio\11\\" + files[i][-17:-4] +"-"+ str(j) + ".wav"
      temp_dataTemp = temp_data[StepNum * (j):StepNum * (j + 1)]
      StepTotalNum = (j + 1) * StepNum
      temp_dataTemp.shape = 1, -1
      temp_dataTemp = temp_dataTemp.astype(np.short)# 打开WAV文档
      f = wave.open(FileName, 'wb')
      # 配置声道数、量化位数和取样频率
      f.setnchannels(nchannels)
      f.setsampwidth(sampwidth)
      f.setframerate(framerate)
      f.writeframes(temp_dataTemp.tostring()) # 将wav_data转换为二进制数据写入文件
      f.close()
      
if __name__ == '__main__' :
  CutAudios()

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