2022年阅读书单

本文目录

1. 1、参考
2. 2、YUV422SP的两种格式
3. 3、YUV422P转换成YUV422SP(NV16)
4. 4、效果图
5. THE END!

1、参考

YUV格式学习：NV16和YUV422P格式互换
YUV格式学习：YUV422P、YV16、NV16、NV61格式转换成RGB24
yuv格式介绍
yuv格式介绍

2、YUV422SP的两种格式

V4L2_PIX_FMT_NV16 (‘NV16’)
V4L2_PIX_FMT_NV61 (‘NV61’)

均为YUV422SP格式。对于NV16来说，紧跟Y平面的是UV交替的平面，而对于NV61来说，紧跟的是VU交替的平面。

3、YUV422P转换成YUV422SP(NV16)

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

/**
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
    }
}




int main(int argc, char** argv)
{
    int width, height;
    int frame_size;
    FILE *fin, *fou;
    unsigned char *y, *nv16;
    int i, frame_num = 0;
    char outname[512]="out_NV16.yuv";
    printf("\nUsage: YUV422PtoNV16.exe input.yuv width height\n\n");
    if (argc != 4)
    {
        return -1;
    }
    fin = fopen(argv[1], "rb");
    if (fin == NULL)
    {
        printf("error:open %s fail\n", argv[1]);
        return -1;
    }

    width = atoi(argv[2]);
    height = atoi(argv[3]);
    frame_size = width * height * 2;//++YUV422P
    y = (unsigned char *)malloc(frame_size);
    if (y == NULL)
    {
        printf("malloc y fail\n");
        return -1;
    }

    nv16 = (unsigned char *)malloc(width*height*2);

    if (nv16 == NULL)
    {
        printf("malloc nv16 fail\n");
        return -1;
    }
    //memset(outname, 0, sizeof(outname));
    //sprintf_s(outname, "%s_NV16.yuv", argv[1]);
    fou = fopen(outname, "wb");
    if (fou == NULL)
    {
        printf("error: open %s fail\n", outname);
        return -1;
    }

    while (!feof(fin))
    {
        int n = 0;
        n = fread(y, 1, width*height*2, fin);

        yuv422p_to_yuv422sp(y, nv16, width, height);

        fwrite(nv16, 1, height*width*2, fou);

        printf("%dth frame ok!!\n", frame_num);

        frame_num++;
    }
    printf("YUV422P to NV16 successfully!!, total frames: %d\n",frame_num);

    free(y);
    y = NULL;
    free(nv16);
    nv16 = NULL;

    fclose(fin);
    fclose(fou);

    return 0;
}
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4、效果图

由于暂时YUVPlayer不支持NV16格式的显示，故效果图暂不展示。

---

THE END!

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