when the /dev/snd/pcmCxPx is created in android

[Kassey Li]

I met below problem when hot plug the HDMI cable when play a video with music:
And I found below error and then sometimes there is no audio output :
        V/WiredAccessoryManager(  668): device hdmi_audio connected
        cannot open pcm: cannot open device '/dev/snd/pcmC0D3p': No such device

when the /dev/snd/pcmCxPx is created in android ?