使用pyaudio无法记录多个wave（无默认输出设备）

Question

我正在尝试编写最简单的程序来拍摄两张录音并录制两张wave文件。您可以获取原始代码：https://gist.github.com/579095ac89fa2fff58db

import pyaudio
import wave

CHUNK = 1024
FORMAT = pyaudio.paInt16
CHANNELS = 1
RATE = 44100
p = pyaudio.PyAudio()

def record(file_name):

  stream = p.open(format = FORMAT,
    channels = CHANNELS,
    rate = RATE,
    input = True,
    frames_per_buffer = CHUNK)

  frames = []
  print "starting recording " + file_name + "."
  for i in range(0, int(RATE / CHUNK * 2)):
    data = stream.read(CHUNK)
    frames.append(data)
  print "finished recording"

  stream.stop_stream()
  stream.close()
  p.terminate()

  wf = wave.open(file_name, 'wb')
  wf.setnchannels(CHANNELS)
  wf.setsampwidth(p.get_sample_size(FORMAT))
  wf.setframerate(RATE)
  wf.writeframes(b''.join(frames))
  wf.close()

record('first.wav')
# try again
record('second.wav')

如果我只调用一次记录函数，一切正常，但是如果我再次调用它，我得到：IOError：[Errno -9996]输入设备无效（没有默认输出设备）。

python record2x.py starting recording first.wav. finished recording Traceback (most recent call last): File "record2x.py", line 38, in <module> record('second') File "record2x.py", line 16, in record frames_per_buffer = CHUNK) File "/usr/local/lib/python2.7/site-packages/pyaudio.py", line 750, in open stream = Stream(self, *args, **kwargs) File "/usr/local/lib/python2.7/site-packages/pyaudio.py", line 441, in __init__ self._stream = pa.open(**arguments) IOError: [Errno -9996] Invalid input device (no default output device)

Answer 1

我过早地终止了流。我只需要删除终止呼叫。

Answer 2

没什么奇怪的。你在函数中调用p.terminate（）意味着你完全解雇了PyAudio。所以它脱离了声卡并等待新的初始化。 p.terminate（）仅在退出程序时调用。 此外，在这里，在你的功能。 stream.stop_stream（）是不必要的，因为stream.close（）会做到这一点。除非您在稍后启动某些音频时遇到一些点击，但这可能只是在使用output = True时，而不是input = True。