linux 虚拟声卡 dummy 创建

  
  应用工程师需要用到一张虚拟声卡，以前没有接触过，这里mark一下。

内核配置如下：

  │     -> Device Drivers                                                                     
  │       -> Sound card support (SOUND [=y])                                                  
  │         -> Advanced Linux Sound Architecture (SND [=y])                                     
  │           -> Generic sound devices (SND_DRIVERS [=y])   



# aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: Dummy [Dummy], device 0: Dummy PCM [Dummy PCM]
  Subdevices: 8/8
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1
  Subdevice #2: subdevice #2
  Subdevice #3: subdevice #3
  Subdevice #4: subdevice #4
  Subdevice #5: subdevice #5
  Subdevice #6: subdevice #6
  Subdevice #7: subdevice #7
card 1: imxspdif [imx-spdif], device 0: S/PDIF PCM snd-soc-dummy-dai-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 2: imxhdmisoc [imx-hdmi-soc], device 0: i.MX HDMI Audio Tx hdmi-hifi-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0