发布一个YV12转RGB24的类(.NET CF)

    最近一直在做Windows Mobile的开发，需要用到从摄像头读取图像，并能够处理每一帧。
    但遇到这样一个问题，从摄像头读取的图像原始格式为YV12,要实现预览必须转化为RGB24。Dshow中有一些filter应该也能完成，但自己对Dshow了解不多，偷偷懒，找找其他办法:-)
    在http://seac.blogchina.com/seac/583337.html上找到一篇关于YV12转RGB24的文章，采用的是完全查表法，把它封装到Native DLL中，每获取到一帧后，P/invoke这个方法进行转化。但有这样几个问题：1，频繁的P/Invoke是项耗时的操作；2，图像反转；3，经转化后的图像有锯齿状（行列错位）
    试着用c#来完成转换，经调试，在dopod 595机子上没问题，速度比P/Invoke要快！

public class YV12ToRGB
2

{
3

private int width;
4

private int height;
5

private int length;
6

private int v; //v值的起始位置
7

private int u; //u值的起始位置
8

private int rdif, invgdif, bdif;
9

private int[] Table_fv1;
10

private int[] Table_fv2;
11

private int[] Table_fu1;
12

private int[] Table_fu2;
13

private int[] rgb = new int[3];
14

private int m, n, i, j, hfWidth;
15

private bool addHalf = true;
16

private int py;
17

private int pos, pos1;//dopod 595 图像调整
18

private byte temp;
19

public YV12ToRGB(int iWidth, int iHeight)
21

{
22

Table_fv1 = new int[256] { -180, -179, -177, -176, -174, -173, -172, -170, -169, -167, -166, -165, -163, -162, -160, -159, -158, -156, -155, -153, -152, -151, -149, -148, -146, -145, -144, -142, -141, -139, -138, -137, -135, -134, -132, -131, -130, -128, -127, -125, -124, -123, -121, -120, -118, -117, -115, -114, -113, -111, -110, -108, -107, -106, -104, -103, -101, -100, -99, -97, -96, -94, -93, -92, -90, -89, -87, -86, -85, -83, -82, -80, -79, -78, -76, -75, -73, -72, -71, -69, -68, -66, -65, -64, -62, -61, -59, -58, -57, -55, -54, -52, -51, -50, -48, -47, -45, -44, -43, -41, -40, -38, -37, -36, -34, -33, -31, -30, -29, -27, -26, -24, -23, -22, -20, -19, -17, -16, -15, -13, -12, -10, -9, -8, -6, -5, -3, -2, 0, 1, 2, 4, 5, 7, 8, 9, 11, 12, 14, 15, 16, 18, 19, 21, 22, 23, 25, 26, 28, 29, 30, 32, 33, 35, 36, 37, 39, 40, 42, 43, 44, 46, 47, 49, 50, 51, 53, 54, 56, 57, 58, 60, 61, 63, 64, 65, 67, 68, 70, 71, 72, 74, 75, 77, 78, 79, 81, 82, 84, 85, 86, 88, 89, 91, 92, 93, 95, 96, 98, 99, 100, 102, 103, 105, 106, 107, 109, 110, 112, 113, 114, 116, 117, 119, 120, 122, 123, 124, 126, 127, 129, 130, 131, 133, 134, 136, 137, 138, 140, 141, 143, 144, 145, 147, 148, 150, 151, 152, 154, 155, 157, 158, 159, 161, 162, 164, 165, 166, 168, 169, 171, 172, 173, 175, 176, 178 };
23

Table_fv2 = new int[256] { -92, -91, -91, -90, -89, -88, -88, -87, -86, -86, -85, -84, -83, -83, -82, -81, -81, -80, -79, -78, -78, -77, -76, -76, -75, -74, -73, -73, -72, -71, -71, -70, -69, -68, -68, -67, -66, -66, -65, -64, -63, -63, -62, -61, -61, -60, -59, -58, -58, -57, -56, -56, -55, -54, -53, -53, -52, -51, -51, -50, -49, -48, -48, -47, -46, -46, -45, -44, -43, -43, -42, -41, -41, -40, -39, -38, -38, -37, -36, -36, -35, -34, -33, -33, -32, -31, -31, -30, -29, -28, -28, -27, -26, -26, -25, -24, -23, -23, -22, -21, -21, -20, -19, -18, -18, -17, -16, -16, -15, -14, -13, -13, -12, -11, -11, -10, -9, -8, -8, -7, -6, -6, -5, -4, -3, -3, -2, -1, 0, 0, 1, 2, 2, 3, 4, 5, 5, 6, 7, 7, 8, 9, 10, 10, 11, 12, 12, 13, 14, 15, 15, 16, 17, 17, 18, 19, 20, 20, 21, 22, 22, 23, 24, 25, 25, 26, 27, 27, 28, 29, 30, 30, 31, 32, 32, 33, 34, 35, 35, 36, 37, 37, 38, 39, 40, 40, 41, 42, 42, 43, 44, 45, 45, 46, 47, 47, 48, 49, 50, 50, 51, 52, 52, 53, 54, 55, 55, 56, 57, 57, 58, 59, 60, 60, 61, 62, 62, 63, 64, 65, 65, 66, 67, 67, 68, 69, 70, 70, 71, 72, 72, 73, 74, 75, 75, 76, 77, 77, 78, 79, 80, 80, 81, 82, 82, 83, 84, 85, 85, 86, 87, 87, 88, 89, 90, 90 };
24

Table_fu1 = new int[256] { -44, -44, -44, -43, -43, -43, -42, -42, -42, -41, -41, -41, -40, -40, -40, -39, -39, -39, -38, -38, -38, -37, -37, -37, -36, -36, -36, -35, -35, -35, -34, -34, -33, -33, -33, -32, -32, -32, -31, -31, -31, -30, -30, -30, -29, -29, -29, -28, -28, -28, -27, -27, -27, -26, -26, -26, -25, -25, -25, -24, -24, -24, -23, -23, -22, -22, -22, -21, -21, -21, -20, -20, -20, -19, -19, -19, -18, -18, -18, -17, -17, -17, -16, -16, -16, -15, -15, -15, -14, -14, -14, -13, -13, -13, -12, -12, -11, -11, -11, -10, -10, -10, -9, -9, -9, -8, -8, -8, -7, -7, -7, -6, -6, -6, -5, -5, -5, -4, -4, -4, -3, -3, -3, -2, -2, -2, -1, -1, 0, 0, 0, 1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4, 4, 5, 5, 5, 6, 6, 6, 7, 7, 7, 8, 8, 8, 9, 9, 9, 10, 10, 11, 11, 11, 12, 12, 12, 13, 13, 13, 14, 14, 14, 15, 15, 15, 16, 16, 16, 17, 17, 17, 18, 18, 18, 19, 19, 19, 20, 20, 20, 21, 21, 22, 22, 22, 23, 23, 23, 24, 24, 24, 25, 25, 25, 26, 26, 26, 27, 27, 27, 28, 28, 28, 29, 29, 29, 30, 30, 30, 31, 31, 31, 32, 32, 33, 33, 33, 34, 34, 34, 35, 35, 35, 36, 36, 36, 37, 37, 37, 38, 38, 38, 39, 39, 39, 40, 40, 40, 41, 41, 41, 42, 42, 42, 43, 43 };
25

Table_fu2 = new int[256] { -227, -226, -224, -222, -220, -219, -217, -215, -213, -212, -210, -208, -206, -204, -203, -201, -199, -197, -196, -194, -192, -190, -188, -187, -185, -183, -181, -180, -178, -176, -174, -173, -171, -169, -167, -165, -164, -162, -160, -158, -157, -155, -153, -151, -149, -148, -146, -144, -142, -141, -139, -137, -135, -134, -132, -130, -128, -126, -125, -123, -121, -119, -118, -116, -114, -112, -110, -109, -107, -105, -103, -102, -100, -98, -96, -94, -93, -91, -89, -87, -86, -84, -82, -80, -79, -77, -75, -73, -71, -70, -68, -66, -64, -63, -61, -59, -57, -55, -54, -52, -50, -48, -47, -45, -43, -41, -40, -38, -36, -34, -32, -31, -29, -27, -25, -24, -22, -20, -18, -16, -15, -13, -11, -9, -8, -6, -4, -2, 0, 1, 3, 5, 7, 8, 10, 12, 14, 15, 17, 19, 21, 23, 24, 26, 28, 30, 31, 33, 35, 37, 39, 40, 42, 44, 46, 47, 49, 51, 53, 54, 56, 58, 60, 62, 63, 65, 67, 69, 70, 72, 74, 76, 78, 79, 81, 83, 85, 86, 88, 90, 92, 93, 95, 97, 99, 101, 102, 104, 106, 108, 109, 111, 113, 115, 117, 118, 120, 122, 124, 125, 127, 129, 131, 133, 134, 136, 138, 140, 141, 143, 145, 147, 148, 150, 152, 154, 156, 157, 159, 161, 163, 164, 166, 168, 170, 172, 173, 175, 177, 179, 180, 182, 184, 186, 187, 189, 191, 193, 195, 196, 198, 200, 202, 203, 205, 207, 209, 211, 212, 214, 216, 218, 219, 221, 223, 225 };
26

width = iWidth;
27

height = iHeight;
28

length = iWidth * iHeight;
29

v = length;
30

u = (length * 5) >> 2;
31

hfWidth = iWidth >> 1;
32

}
33

public bool Convert(byte[] yv12, ref byte[] rgb24)
35

{
36

if (yv12.Length == 0 || rgb24.Length == 0)
37

return false;
38

m = -width;
39

n = -hfWidth;
40

for (int y = 0; y < height; y++)
41

{
42

m += width;
43

if (addHalf)
44

{
45

n += hfWidth;
46

addHalf = false;
47

}
48

else
49

{
50

addHalf = true;
51

}
52

for (int x = 0; x < width; x++)
53

{
54

i = m + x;
55

j = n + (x >> 1);
56

py = (int)yv12[i];
57

rdif = Table_fv1[(int)yv12[v + j]];
58

invgdif = Table_fu1[(int)yv12[u + j]] + Table_fv2[(int)yv12[v + j]];
59

bdif = Table_fu2[(int)yv12[u + j]];
60

rgb[2] = py + rdif;
62

rgb[1] = py - invgdif;
63

rgb[0] = py + bdif;
64

j = m + x;
66

i = (j << 1) + j;
67

for (j = 0; j < 3; j++)
69

{
70

rgb24[i + j] = (byte)((rgb[j] < 0) ? 0 : ((rgb[j] > 255) ? 255 : rgb[j]));
71

}
72

if (x % 4 == 3)
73

{
74

pos = (m + x - 1) * 3;
75

pos1 = (m + x) * 3;
76

temp = rgb24[pos];
77

rgb24[pos] = rgb24[pos1];
78

rgb24[pos1] = temp;
79

temp = rgb24[pos + 1];
81

rgb24[pos + 1] = rgb24[pos1 + 1];
82

rgb24[pos1 + 1] = temp;
83

temp = rgb24[pos + 2];
85

rgb24[pos + 2] = rgb24[pos1 + 2];
86

rgb24[pos1 + 2] = temp;
87

}
88

}
89

}
90

return true;
91

}
92

}

posted on 2008-05-29 10:43 pqmagic 阅读(2359) 评论(1) 编辑收藏举报

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发布一个YV12转RGB24的类(.NET CF)

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