Support on discontinuous planer buffer and stride

[Jun Nie]

Hi,
     I re-send this email for the last one is rejected by system. I am
sorry if you guys received both.

     I am optimizing video playback with overlay with V4L2 driver. The
video content is a sub-region of codec output. Thus a memory copy is
necessary.
    Is there plan to support for stride and discrete YUV planer in
kernel? Such as below changes can help much for my usage case.

--- a/include/linux/videodev2.h
+++ b/include/linux/videodev2.h
@@ -529,7 +529,20 @@ struct v4l2_buffer {
                __u32           offset;
                unsigned long   userptr;
        } m;
+       /* UV/GB location is valid only in planer case */
+       union {
+               __u32           offset_ug;
+               unsigned long   userptr_ug;
+       } m_ug;
+       union {
+               __u32           offset_vb;
+               unsigned long   userptr_vb;
+       } m_vb;
        __u32                   length;
+       /* stride of YUV or RGB */
+       __u32                   stride_yr;
+       __u32                   stride_ug;
+       __u32                   stride_vb;
        __u32                   input;
        __u32                   reserved;
 };

    If such change is acceptable for everyone, I may help on the implementation.
    Any comments are welcome.

Jun
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