fix audio_in type bug

hnluo

2023-02-07 02a3eefb3575fa1883b13c85121b07c415958fd0

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p m    p.m.
pm    p.m.
p.m.
p.m    p.m.
am    a.m.
a.m.
a.m    a.m.
a m    a.m.