python - alsaaudio python卡要放什么？

Question

我正在尝试在我的 python 代码中使用 alsaaudio。

inp = alsaaudio.PCM(alsaaudio.PCM_CAPTURE, alsaaudio.PCM_NONBLOCK, 卡)

第三个参数card应该放什么？

root@abc:~/Desktop# arecord --list-devices
**** List of CAPTURE Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC269VB Analog [ALC269VB Analog]
  Subdevices: 0/1
  Subdevice #0: subdevice #0
card 1: H340 [Logitech USB Headset H340], device 0: USB Audio [USB Audio]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

我想从 Logitech USB 耳机输入音频。
应该是 hw:1,0 ??????

谢谢

Answer 1

documentation说:

class alsaaudio.PCM(type=PCM_PLAYBACK, mode=PCM_NORMAL, device='default', cardindex=-1)

This class is used to represent a PCM device (either for playback and recording). The arguments are:
[…]

• device - the name of the PCM device that should be used (for example a value from the output of pcms()). The default value is 'default'.

[…]

Changed in 0.8:

• The card keyword argument is still supported, but deprecated. Please use device instead.
• The keyword argument cardindex was added.

The card keyword is deprecated because it guesses the real ALSA name of the card. This was always fragile and broke some legitimate usecases.