Question

我已经工作了几个小时，试图找到一种无需麦克风即可测量应用程序音量的方法。

我首先尝试使用PyAudio，但所有示例都是使用麦克风作为捕获来自扬声器的声音的设备，但是由于我没有麦克风，所以这变得很困难。

然后我找到了python-sounddevice，它似乎应该可以工作，但是尝试获取声音时却不断出错。

这是我使用的代码：

import sounddevice as sd
import numpy as np

duration = 10
print("___________")
print("Devices:\n" + str(sd.query_devices()))
sd.default.device = [1, 1]
sd.default.channels = [0, 2]
print("___________")


def print_sound(indata, outdata, frames, time, status):
    volume_norm = np.linalg.norm(indata)*10
    print(int(volume_norm))


with sd.Stream(callback=print_sound):
    sd.sleep(duration * 1000)

我打印了设备，所以我将在这里打印它们：

Devices:
  0 Microsoft Sound Mapper - Output, MME (0 in, 2 out)
< 1 Högtalare (High Definition Audi, MME (0 in, 2 out)
  2 Primär ljuddrivrutin, Windows DirectSound (0 in, 2 out)
  3 Högtalare (High Definition Audio Device), Windows DirectSound (0 in, 2 out)
  4 Högtalare (High Definition Audio Device), Windows WASAPI (0 in, 2 out)
  5 SPDIF Out (HD Audio SPDIF out 2), Windows WDM-KS (0 in, 2 out)
  6 SPDIF Out (HD Audio SPDIF out), Windows WDM-KS (0 in, 2 out)
  7 Speakers (HD Audio Speaker), Windows WDM-KS (0 in, 6 out)

这是我得到的错误：

Traceback (most recent call last):
  File "sound_handler.py", line 17, in <module>
    with sd.Stream(callback=print_sound):
  File "C:\Users\breid\AppData\Local\Programs\Python\Python36\lib\site-packages\sounddevice.py", line 1662, in __init__
    **_remove_self(locals()))
  File "C:\Users\breid\AppData\Local\Programs\Python\Python36\lib\site-packages\sounddevice.py", line 780, in __init__
    'Error opening {0}'.format(self.__class__.__name__))
  File "C:\Users\breid\AppData\Local\Programs\Python\Python36\lib\site-packages\sounddevice.py", line 2572, in _check
    raise PortAudioError(errormsg, err)
sounddevice.PortAudioError: Error opening Stream: Invalid number of channels [PaErrorCode -9998]

也许我采用了错误的方式，通道为0 in 2 out，我尝试将其作为默认值。

Python，从sund卡测量声音

0 个答案: