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关于FVID2_Frame结构体的一点疑惑

基本信息:

evmdm8168+vs daughter card

dvr_rdk

mcfw_demo

问题

我想改下swosd的算法,然后这个FVID2_Frame是该算法的传入参数之一,这个结构体的第一个成员:

    Ptr                 addr[FVID2_MAX_FIELDS][FVID2_MAX_PLANES];
里面注释到

         Representation of YUV420SP or YUV422SP Buffer:
         Field 0 Y  -> addr[0][0], Field 1 Y  -> addr[1][0]
         Field 0 UV -> addr[0][1], Field 1 UV -> addr[1][1]
         Other pointers are not valid.
疑问1:送入swosd的帧是yuv420sp格式的么?

疑问2:为啥addr[0][1]这样的一个地址可以表示uv两个分量啊??