support pcm audio format

hnluo

2023-02-06 ade51b3a12e47b82e297a0107d98c514fbb41318

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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.