error: non-constant-expression cannot be narrowed from type 'int' to 'SLuint32'
問題：wav_get_rate(wav)返回類型是unit16_t,然後與1000相乘後返回int類型 但是需要返回unit32_t類型，然後報了下面的錯誤 原因：返回的類型與所需要的類型不一致 解決辦法： 將int類型轉爲unit類型
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