Modules/yuv.h

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