我正在尝试将充满.wav文件的文件夹的现有采样率减半。这是我找到的唯一方法,但行不通。读取部分工作得很好,直到f.k close(),然后是wave。写部分导致错误。
import wave
import contextlib
import os
for file_name in os.listdir(os.getcwd()):
if file_name.endswith(".wav"):
with contextlib.closing(wave.open(file_name, 'rb')) as f:
rate = f.getframerate()
new_rate = rate/2
f.close()
with contextlib.closing(wave.open(file_name, 'wb')) as f:
rate = f.setframerate(new_rate)
这是我运行它时的输出。
Traceback (most recent call last):
File "C:UsershsashOneDriveDesktopused AR1-20210513T223533Z-001 - Copy (2)soundspython code.py", line 36, in <module>
rate = f.setframerate(new_rate)
File "C:UsershsashAppDataLocalProgramsPythonPython39libcontextlib.py", line 303, in __exit__
self.thing.close()
File "C:UsershsashAppDataLocalProgramsPythonPython39libwave.py", line 444, in close
self._ensure_header_written(0)
File "C:UsershsashAppDataLocalProgramsPythonPython39libwave.py", line 462, in _ensure_header_written
raise Error('# channels not specified')
wave.Error: # channels not specified
上面写着#channels not specified
。当你打开一个wavefile进行写入时,python将所有的头字段设置为零,与文件的当前状态无关。
为了确保保存其他字段,您需要在第一次读取旧文件时将它们从旧文件复制过来。
在下面的代码片段中,我使用getparams
和setparams
来复制头字段,我使用readframes
和writeframes
来复制波数据。
import wave
import contextlib
import os
for file_name in os.listdir(os.getcwd()):
if file_name.endswith(".wav"):
with contextlib.closing(wave.open(file_name, 'rb')) as f:
rate = f.getframerate()
params = f.getparams()
frames = f.getnframes()
data = f.readframes(frames)
new_rate = rate/2
f.close()
with contextlib.closing(wave.open(file_name, 'wb')) as f:
f.setparams(params)
f.setframerate(new_rate)
f.writeframes(data)