[Vala] how vala types are mapped to C ones?

[vasaka gmail com]

when writing .vapi file how to handle correctly types like int64_t and char[32]

in particular I need to wrap a structs from videodev.h

public struct video_capability
{
  public char name[32];
  public int type;
  public int channels;/* Num channels */
  public int audios;/* Num audio devices */
  public int maxwidth;/* Supported width */
  public int maxheight;/* And height */
  public int minwidth;/* Supported width */
  public int minheight;/* And height */
}


struct video_window
{
  public __u32   x,y;                    /* Position of window */
  public __u32   width,height;           /* Its size */
  public __u32   chromakey;
  public __u32   flags;
  public struct  video_clip *clips;      /* Set only */
  public int     clipcount;
}

and not shure that simple changing char name[32] to char* name and
__u32 to int will produce correct code in most cases.
and what to do with nested structures?
-- 
Vasily Levin