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
以上这篇Python对wav文件的重采样实例就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持脚本之家。
