函数 av_xtea_le_init 

pub unsafe extern "C" fn av_xtea_le_init(
    ctx: *mut AVXTEA,
    key: *const u8,
)

Initialize an AVXTEA context.

@param ctx an AVXTEA context @param key a key of 16 bytes used for encryption/decryption, interpreted as little endian 32 bit numbers