我需要在麦克风捕获的内容中添加声音，可以吗？我开始于
man aplay
并发现我能做到
aplay -D PCMdevice filepath.wav
然后我列出了 PCM 设备
~$ aplay -L
null
Discard all samples (playback) or generate zero samples (capture)
default:CARD=Device
USB Advanced Audio Device, USB Audio
Default Audio Device
sysdefault:CARD=Device
USB Advanced Audio Device, USB Audio
Default Audio Device
front:CARD=Device,DEV=0
USB Advanced Audio Device, USB Audio
Front speakers
surround40:CARD=Device,DEV=0
USB Advanced Audio Device, USB Audio
4.0 Surround output to Front and Rear speakers
surround41:CARD=Device,DEV=0
USB Advanced Audio Device, USB Audio
4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=Device,DEV=0
USB Advanced Audio Device, USB Audio
5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=Device,DEV=0
USB Advanced Audio Device, USB Audio
5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=Device,DEV=0
USB Advanced Audio Device, USB Audio
7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
iec958:CARD=Device,DEV=0
USB Advanced Audio Device, USB Audio
IEC958 (S/PDIF) Digital Audio Output
dmix:CARD=Device,DEV=0
USB Advanced Audio Device, USB Audio
Direct sample mixing device
dsnoop:CARD=Device,DEV=0
USB Advanced Audio Device, USB Audio
Direct sample snooping device
hw:CARD=Device,DEV=0
USB Advanced Audio Device, USB Audio
Direct hardware device without any conversions
plughw:CARD=Device,DEV=0
USB Advanced Audio Device, USB Audio
Hardware device with all software conversions
但我找不到任何包含麦克风或捕获或输入名称的 PCM 设备，一切似乎都是输出，所以我认为这是一个糟糕的线索。
有人找到获得结果的方法吗？