请写出将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

以下是将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) {
        fprintf(stderr, "Usage: %s input.yuyv output.yuv\n", argv[0]);
        return 1;
    }

    char *input_file = argv[1];
    char *output_file = argv[2];

    FILE *input_fp = fopen(input_file, "rb");
    if (input_fp == NULL) {
        fprintf(stderr, "Error: Cannot open input file %s\n", input_file);
        return 1;
    }

    FILE *output_fp = fopen(output_file, "wb");
    if (output_fp == NULL) {
        fprintf(stderr, "Error: Cannot open output file %s\n", output_file);
        return 1;
    }

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

    unsigned char *yuyv_buffer = (unsigned char *)malloc(y_size * 2);
    unsigned char *y_buffer = (unsigned char *)malloc(y_size);
    unsigned char *u_buffer = (unsigned char *)malloc(uv_size);
    unsigned char *v_buffer = (unsigned char *)malloc(uv_size);

    int frame_count = 0;

    while (fread(yuyv_buffer, 1, y_size * 2, input_fp) == y_size * 2) {
        frame_count++;

        // YUYV to YUV420P conversion
        for (int i = 0, y = 0; i < y_size * 2; i += 4, y++) {
            y_buffer[y] = yuyv_buffer[i];
            if (y % 2 == 0) {
                u_buffer[y / 4] = yuyv_buffer[i + 1];
                v_buffer[y / 4] = yuyv_buffer[i + 3];
            }
        }

        // Write YUV420P frame to output file
        fwrite(y_buffer, 1, y_size, output_fp);
        fwrite(u_buffer, 1, uv_size, output_fp);
        fwrite(v_buffer, 1, uv_size, output_fp);
    }

    free(yuyv_buffer);
    free(y_buffer);
    free(u_buffer);
    free(v_buffer);

    fclose(input_fp);
    fclose(output_fp);

    printf("Converted %d frames.\n", frame_count);

    return 0;
}

这个程序通过打开输入文件、输出文件，从输入文件读取YUYV数据，将其转换成YUV420P格式，然后写入输出文件。在上面的程序中，我们假设输入图像的分辨率为640x480像素，因此YUV420P图像的大小是640x480x3/2=460800字节。