重新写出将yuyv数据转换成yuv420p的程序，要求输入文件input.yuyv 输出文件output.yuv ,请用C语言实现程序

好的，这里是将yuyv数据转换成yuv420p的C语言程序：

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

int main(int argc, char **argv) {
    if (argc != 3) {
        printf("Usage: %s input.yuyv output.yuv\n", argv[0]);
        return 1;
    }

    FILE *fin = fopen(argv[1], "rb");
    if (!fin) {
        printf("Failed to open input file: %s\n", argv[1]);
        return 1;
    }

    FILE *fout = fopen(argv[2], "wb");
    if (!fout) {
        printf("Failed to open output file: %s\n", argv[2]);
        fclose(fin);
        return 1;
    }

    int width = 640;
    int height = 480;
    int y_size = width * height;
    int uv_size = y_size / 4;

    unsigned char *yuyv = (unsigned char *) malloc(y_size * 2);
    unsigned char *yuv420p = (unsigned char *) malloc(y_size * 3 / 2);

    while (fread(yuyv, 1, y_size * 2, fin) == y_size * 2) {
        for (int i = 0, j = 0; i < y_size * 2; i += 4, j += 6) {
            // Convert YUYV to YUV420P
            yuv420p[j] = yuyv[i];
            yuv420p[j + 1] = yuyv[i + 1];
            yuv420p[j + 2] = yuyv[i + 3];
            yuv420p[j + 3] = yuyv[i + 2];
        }

        // Copy U and V channels
        for (int i = 0; i < uv_size; i++) {
            yuv420p[y_size + i] = yuyv[y_size * 2 + i * 2 + 1];
            yuv420p[y_size + uv_size + i] = yuyv[y_size * 2 + i * 2];
        }

        fwrite(yuv420p, 1, y_size * 3 / 2, fout);
    }

    free(yuyv);
    free(yuv420p);
    fclose(fin);
    fclose(fout);

    return 0;
}

这个程序会读取名为 `input.yuyv` 的文件，将其中的 YUYV 格式数据转换成 YUV420P 格式，然后写入名为 `output.yuv` 的文件中。程序假定输入文件的分辨率为 640x480，输出文件的 Y、U、V 分量为连续存储的。