ref: 12f7fc7a0874c568e147627ca043eff33be6188e
dir: /sys/src/cmd/python/Modules/yuv.h/
#ifndef Py_YUV_H
#define Py_YUV_H
#ifdef __cplusplus
extern "C" {
#endif
/*
* SVideo YUV 4:1:1 format.
*
* 4 consecutive quadwords describe 8 pixels on 2 lines, as depicted
* below. An array of (width/4) of the below structure describes 2
* scan lines.
*
* +-------------------+
* | 00 | 01 | 02 | 03 | . . .
* +-------------------+
* | 10 | 11 | 12 | 13 | . . .
* +-------------------+
*/
struct yuv411 {
struct {
unsigned int dummy:8;
unsigned int y0:8;
unsigned int u0:2;
unsigned int v0:2;
unsigned int y1:8;
unsigned int u1:2;
unsigned int v1:2;
} v[4];
};
#define YUV411_Y00(y) (y).v[0].y0
#define YUV411_Y01(y) (y).v[1].y0
#define YUV411_Y02(y) (y).v[2].y0
#define YUV411_Y03(y) (y).v[3].y0
#define YUV411_Y10(y) (y).v[0].y1
#define YUV411_Y11(y) (y).v[1].y1
#define YUV411_Y12(y) (y).v[2].y1
#define YUV411_Y13(y) (y).v[3].y1
#define YUV411_U00(y) ((y).v[0].u0<<6|(y).v[1].u0<<4|(y).v[2].u0<<2|(y).v[3].u0)
#define YUV411_U01(y) YUV411_U00(y)
#define YUV411_U02(y) YUV411_U00(y)
#define YUV411_U03(y) YUV411_U00(y)
#define YUV411_U10(y) ((y).v[0].u1<<6|(y).v[1].u1<<4|(y).v[2].u1<<2|(y).v[3].u1)
#define YUV411_U11(y) YUV411_U10(y)
#define YUV411_U12(y) YUV411_U10(y)
#define YUV411_U13(y) YUV411_U10(y)
#define YUV411_V00(y) ((y).v[0].v0<<6|(y).v[1].v0<<4|(y).v[2].v0<<2|(y).v[3].v0)
#define YUV411_V01(y) YUV411_V00(y)
#define YUV411_V02(y) YUV411_V00(y)
#define YUV411_V03(y) YUV411_V00(y)
#define YUV411_V10(y) ((y).v[0].v1<<6|(y).v[1].v1<<4|(y).v[2].v1<<2|(y).v[3].v1)
#define YUV411_V11(y) YUV411_V10(y)
#define YUV411_V12(y) YUV411_V10(y)
#define YUV411_V13(y) YUV411_V10(y)
/*
* Compression Library YUV 4:2:2 format.
*
* 1 longword describes 2 pixels.
*
* +-------+
* | 0 | 1 |
* +-------+
*/
struct yuv422 {
unsigned int u:8;
unsigned int y0:8;
unsigned int v:8;
unsigned int y1:8;
};
#define YUV422_Y0(y) (y).y0
#define YUV422_Y1(y) (y).y1
#define YUV422_U0(y) (y).u
#define YUV422_U1(y) (y).u
#define YUV422_V0(y) (y).v
#define YUV422_V1(y) (y).v
/*
* Compression library YUV 4:2:2 Duplicate Chroma format.
*
* This is like the previous format, but the U and V values are
* duplicated vertically (and hence there is some redundancy in the
* data). With other words, lines 2*n and 2*n+1 have the same U and V
* values but different Y values.
*/
/*
* Conversion functions.
*/
void yuv_sv411_to_cl422dc(int, void *, void *, int, int);
void yuv_sv411_to_cl422dc_quartersize(int, void *, void *, int, int);
void yuv_sv411_to_cl422dc_sixteenthsize(int, void *, void *, int, int);
#ifdef __cplusplus
}
#endif
#endif /* !Py_YUV_H */