Modules/yuv.h

   1 #ifndef Py_YUV_H
   2 #define Py_YUV_H
   3 #ifdef __cplusplus
   4 extern "C" {
   5 #endif
   6
   7 /*
   8  * SVideo YUV 4:1:1 format.
   9  *
  10  * 4 consecutive quadwords describe 8 pixels on 2 lines, as depicted
  11  * below.  An array of (width/4) of the below structure describes 2
  12  * scan lines.
  13  *
  14  * +-------------------+
  15  * | 00 | 01 | 02 | 03 | . . .
  16  * +-------------------+
  17  * | 10 | 11 | 12 | 13 | . . .
  18  * +-------------------+
  19  */
  20 struct yuv411 {
  21         struct {
  22                 unsigned int dummy:8;
  23                 unsigned int y0:8;
  24                 unsigned int u0:2;
  25                 unsigned int v0:2;
  26                 unsigned int y1:8;
  27                 unsigned int u1:2;
  28                 unsigned int v1:2;
  29         } v[4];
  30 };
  31
  32 #define YUV411_Y00(y)   (y).v[0].y0
  33 #define YUV411_Y01(y)   (y).v[1].y0
  34 #define YUV411_Y02(y)   (y).v[2].y0
  35 #define YUV411_Y03(y)   (y).v[3].y0
  36 #define YUV411_Y10(y)   (y).v[0].y1
  37 #define YUV411_Y11(y)   (y).v[1].y1
  38 #define YUV411_Y12(y)   (y).v[2].y1
  39 #define YUV411_Y13(y)   (y).v[3].y1
  40 #define YUV411_U00(y)   ((y).v[0].u0<<6|(y).v[1].u0<<4|(y).v[2].u0<<2|(y).v[3].u0)
  41 #define YUV411_U01(y)   YUV411_U00(y)
  42 #define YUV411_U02(y)   YUV411_U00(y)
  43 #define YUV411_U03(y)   YUV411_U00(y)
  44 #define YUV411_U10(y)   ((y).v[0].u1<<6|(y).v[1].u1<<4|(y).v[2].u1<<2|(y).v[3].u1)
  45 #define YUV411_U11(y)   YUV411_U10(y)
  46 #define YUV411_U12(y)   YUV411_U10(y)
  47 #define YUV411_U13(y)   YUV411_U10(y)
  48 #define YUV411_V00(y)   ((y).v[0].v0<<6|(y).v[1].v0<<4|(y).v[2].v0<<2|(y).v[3].v0)
  49 #define YUV411_V01(y)   YUV411_V00(y)
  50 #define YUV411_V02(y)   YUV411_V00(y)
  51 #define YUV411_V03(y)   YUV411_V00(y)
  52 #define YUV411_V10(y)   ((y).v[0].v1<<6|(y).v[1].v1<<4|(y).v[2].v1<<2|(y).v[3].v1)
  53 #define YUV411_V11(y)   YUV411_V10(y)
  54 #define YUV411_V12(y)   YUV411_V10(y)
  55 #define YUV411_V13(y)   YUV411_V10(y)
  56
  57 /*
  58  * Compression Library YUV 4:2:2 format.
  59  *
  60  * 1 longword describes 2 pixels.
  61  *
  62  * +-------+
  63  * | 0 | 1 |
  64  * +-------+
  65  */
  66 struct yuv422 {
  67         unsigned int u:8;
  68         unsigned int y0:8;
  69         unsigned int v:8;
  70         unsigned int y1:8;
  71 };
  72 #define YUV422_Y0(y)    (y).y0
  73 #define YUV422_Y1(y)    (y).y1
  74 #define YUV422_U0(y)    (y).u
  75 #define YUV422_U1(y)    (y).u
  76 #define YUV422_V0(y)    (y).v
  77 #define YUV422_V1(y)    (y).v
  78
  79 /*
  80  * Compression library YUV 4:2:2 Duplicate Chroma format.
  81  *
  82  * This is like the previous format, but the U and V values are
  83  * duplicated vertically (and hence there is some redundancy in the
  84  * data).  With other words, lines 2*n and 2*n+1 have the same U and V
  85  * values but different Y values.
  86  */
  87
  88 /*
  89  * Conversion functions.
  90  */
  91 void yuv_sv411_to_cl422dc(int, void *, void *, int, int);
  92 void yuv_sv411_to_cl422dc_quartersize(int, void *, void *, int, int);
  93 void yuv_sv411_to_cl422dc_sixteenthsize(int, void *, void *, int, int);
  94
  95 #ifdef __cplusplus
  96 }
  97 #endif
  98 #endif /* !Py_YUV_H */