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在MCFW中的mcfw/src_bios6/links_m3vpss/capture下面的是主图的处理，进来的数据也是YUV422p.
并且Capture->nextLink是nsf，
1、请问mcfw/src_bios6/links_m3vpss/nsf具体是干什么用的呢？
2、能否利用EDMA的方法将YUV422P的交出存储VYUY改成YUV420SP？
NSF的作用是做YUV422P到YUV420的转换。
