fix loading multi-channel mp3 file bug

haoneng.lhn

2023-06-27 a0defaf40e62417a76b954819dc8119290ea9ab1

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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.