SDL_Overlay - YUV video overlay
typedef struct{
Uint32 format;
int w, h;
int planes;
Uint16 *pitches;
Uint8 **pixels;
Uint32 hw_overlay:1;
} SDL_Overlay;
- 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.
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 (link to URL
http://www.webartz.com/fourcc/indexyuv.htm) .
SDL_CreateYUVOverlay,
SDL_LockYUVOverlay,
SDL_UnlockYUVOverlay,
SDL_FreeYUVOverlay