SDL_Overlay - YUV video overlay

       A SDL_Overlay is similar to a SDL_Surface except it stores a YUV overlay. All the fields are  read  only,
       except  for  pixels  which should be locked before use. The format field stores the format of the overlay
       which is one of the following:

       #define SDL_YV12_OVERLAY  0x32315659  /* Planar mode: Y + V + U */
       #define SDL_IYUV_OVERLAY  0x56555949  /* Planar mode: Y + U + V */
       #define SDL_YUY2_OVERLAY  0x32595559  /* Packed mode: Y0+U0+Y1+V0 */
       #define SDL_UYVY_OVERLAY  0x59565955  /* Packed mode: U0+Y0+V0+Y1 */
       #define SDL_YVYU_OVERLAY  0x55595659  /* Packed mode: Y0+V0+Y1+U0 */

        More information on YUV formats can be found at http://www.webartz.com/fourcc/indexyuv.htm(linktoURLhttp://www.webartz.com/fourcc/indexyuv.htm) .

       SDL_Overlay - YUV video overlay

SDL_CreateYUVOverlay, SDL_LockYUVOverlay, SDL_UnlockYUVOverlay, SDL_FreeYUVOverlay

SDL                                          Tue 11 Sep 2001, 23:01                               SDL_Overlay(3)

format              Overlay format (see below)

       w,h                Width and height of overlay

       planes              Number of planes in the overlay. Usually either 1 or 3

       pitches             An array of pitches, one for each plane. Pitch is the length of a row in bytes.

       pixels              An  array  of pointers to teh data of each plane. The overlay should be locked before
                           these pointers are used.

       hw_overlay          This will be set to 1 if the overlay is hardware accelerated.

       typedef struct{
         Uint32 format;
         int w, h;
         int planes;
         Uint16 *pitches;
         Uint8 **pixels;
         Uint32 hw_overlay:1;
       } SDL_Overlay;