YUV格式学习：NV16和YUV422P格式互换

技术杂铺 280 字 次

其实以前也实现过SP转P的格式，现在再完善一些，写成此文。由于是相同采样空间的转换，只是个别分量位置的调整，只要明白了Y、U、V分量的布置，就很容易写出来。

代码如下：

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
/**
yyyy yyyy
uv    uv
->
yyyy yyyy
uu
vv
*/
void yuv422sp_to_yuv422p(unsigned char* yuv422sp, unsigned char* yuv422p, int width, int height)
{
    int i, j;
    int y_size;
    int uv_size;
    unsigned char* p_y1;
    unsigned char* p_uv;
 
    unsigned char* p_y2;
    unsigned char* p_u;
    unsigned char* p_v;
 
    y_size = uv_size = width * height;
 
    p_y1 = yuv422sp;
    p_uv = yuv422sp + y_size;
 
    p_y2 = yuv422p;
    p_u  = yuv422p + y_size;
    p_v  = p_u + width * height / 2;
 
    memcpy(p_y2, p_y1, y_size);
 
    for (j = 0, i = 0; j < uv_size; j+=2, i++)
    {
        p_u[i] = p_uv[j];
        p_v[i] = p_uv[j+1];
    }
}
 
/**
yyyy yyyy
uu
vv
->
yyyy yyyy
uv    uv
*/
void yuv422p_to_yuv422sp(unsigned char* yuv422p, unsigned char* yuv422sp, int width, int height)
{
    int i, j;
    int y_size;
    int uv_size;
    unsigned char* p_y1;
    unsigned char* p_uv;
 
    unsigned char* p_y2;
    unsigned char* p_u;
    unsigned char* p_v;
 
    y_size = uv_size = width * height;
 
    p_y1 = yuv422p;
 
    p_y2 = yuv422sp;
    p_u  = p_y1 + y_size;
    p_v  = p_u + width * height / 2;
 
    p_uv = p_y2 + y_size;
 
    memcpy(p_y2, p_y1, y_size);
 
    for (j = 0, i = 0; j < uv_size; j+=2, i++)
    {
    // 此处可调整U、V的位置，变成NV16或NV61
#if 01
        p_uv[j] = p_u[i];
        p_uv[j+1] = p_v[i];
#else
        p_uv[j] = p_v[i];
        p_uv[j+1] = p_u[i];
#endif
    }
}

李迟 2015.8.5 晚上