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关于VENC_CALLBACK_S中回调函数的问题



各位大侠,小弟刚刚开始接触8148,现在在阅读ipnc_rdk,有个问题请教大家:

在mcfw/interfaces目录下,有个Ti_venc.h的头文件,该头文件中,有个VENC_CALLBACK_S结构体,

typedef struct {

    VENC_CALLBACK_NEW_DATA  newDataAvailableCb;     /**< New encoded bitstream available callback */

} VENC_CALLBACK_S;

请问,如果我给这个结构体赋值后,该函数什么时候被调用??