2022年阅读书单

本文目录

1. 1、参考
2. 2、功能
3. 3、C实现
4. 4、实验结果
5. THE END!

1、参考

http://www.360doc.com/content/16/0831/17/28378250_587310305.shtm
https://blog.csdn.net/liyuanbhu/article/details/68951683l
https://blog.csdn.net/Alger_magic/article/details/52487582
https://blog.csdn.net/MikeDai/article/details/64215860

2、功能

yuv420toRGB24.c
1). 支持将单帧yuv转换成单幅rgb24格式的bmp图像；
2). 支持将多帧yuv转换成rgb24格式的视频文件。
3). 单帧yuv的获取可以采用：
extractYUV（https://blog.csdn.net/soaringlee_fighting/article/details/80503240）

3、C实现

/***************************************************************
//函数：YUV420PtoRGB24.c
//功能：
//1). 支持将单帧yuv转换成单幅rgb24格式的bmp图像；
//2). 支持将多帧yuv转换成rgb24格式的视频文件。
//时间：2018.6.10
****************************************************************/

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

int bmp24_write(unsigned char *image, int xsize, int ysize, FILE *pfile)
{
    BITMAPFILEHEADER bmpFileHeader; //++BMP文件头
    BITMAPINFOHEADER bmpInfoHeader; //++BMP信息头
    bmpInfoHeader.biBitCount = 24; //++像素位数
    //设置BMP文件头
    bmpFileHeader.bfType = 0x04D42;
    bmpFileHeader.bfSize = sizeof(bmpFileHeader)+sizeof(bmpInfoHeader)+bmpInfoHeader.biBitCount;
    bmpFileHeader.bfReserved1 = 0;
    bmpFileHeader.bfReserved2 = 0;
    bmpFileHeader.bfOffBits = 54;//位图像素位置的起始地址

    //设置BMP信息头
    bmpInfoHeader.biSize = 40;
    bmpInfoHeader.biWidth = xsize;
    bmpInfoHeader.biHeight = ysize;
    bmpInfoHeader.biPlanes = 1;

    bmpInfoHeader.biCompression = 0;//压缩类型，0即不压缩
    bmpInfoHeader.biSizeImage = 0;
    bmpInfoHeader.biXPelsPerMeter = 0;
    bmpInfoHeader.biYPelsPerMeter = 0;
    bmpInfoHeader.biClrUsed = 0;
    bmpInfoHeader.biClrImportant = 0;

    fwrite(&bmpFileHeader, 1, sizeof(bmpFileHeader), pfile);
    fwrite(&bmpInfoHeader, 1, sizeof(bmpInfoHeader), pfile);
    fwrite(image, 1, xsize*ysize * 3, pfile);

    return 0;
}

int rgb24_write(unsigned char *image, int xsize, int ysize, FILE *pfile)
{
    fwrite(image, 1, xsize*ysize * 3, pfile);
    return 0;
}
int yuv420toRGB24(unsigned char* yuv420, unsigned char*rgb24, int width, int height,int bmp_flag)
{
    //++参数检查
    if (NULL == yuv420 || NULL == rgb24 || width < 1 || height < 1)
    {
        printf("ERROR: input para error!!\n");
        return -1;
    }
    int Y, U, V, R, G, B;
    int i, j;
    int cwidth = width >> 1;

    for (i = 0; i < height; ++i)
    {
        for (j = 0; j < width; ++j)
        {
            Y = *(yuv420 + i * width + j);
            U = *(yuv420 + width * height + (i >> 1) * cwidth + (j >> 1));
            V = *(yuv420 + width * height * 5 / 4 + (i >> 1) * cwidth + (j >> 1));
            R = Y + 1.403 * (V - 128);
            G = Y - 0.344 * (U - 128) - 0.714 * (V - 128);
            B = Y + 1.772 * (U - 128);

            if (R <= 0 || R >= 255)
            {
                R = (R < 0) ? 0 : 255;
            }
            if (G <= 0 || G >= 255)
            {
                G = (G < 0) ? 0 : 255;
            }
            if (B <= 0 || B >= 255)
            {
                B = (B < 0) ? 0 : 255;
            }
            if (bmp_flag)
            {
                //BMP图像的存放是从最后一行(从下往上)开始按照B\G\R的顺序进行存放的
                *(rgb24 + ((height - i - 1)*width + j) * 3) = B;
                *(rgb24 + ((height - i - 1)*width + j) * 3 + 1) = G;
                *(rgb24 + ((height - i - 1)*width + j) * 3 + 2) = R;
            }
            else
            {
                *(rgb24 + (i * width + j) * 3) = B;
                *(rgb24 + (i * width + j) * 3 + 1) = G;
                *(rgb24 + (i* width + j) * 3 + 2) = R;
            }
        }
    }

    return 0;
}

int main(int argc, char** argv)
{
    int width, height, filelen, frameno, framenum, bmp_flag;
    FILE *yuv_file, *rgb_file;
    unsigned char *yuv420, *rgb24;
    char filename[50];

    if (argc < 5)
    {
        printf("Usage: yuv420ptoRGB24.exe yuv420_file rgb24_filename width height\n\n");
    }

    yuv_file = fopen(argv[1], "rb");
    if (NULL == yuv_file)
    {
        printf("ERROR: open %s fail!\n", argv[1]);
        return -1;
    }

    width = atoi(argv[3]);
    height = atoi(argv[4]);

    yuv420 = (unsigned char *)malloc(width*height * 3 / 2);
    if (NULL == yuv420)
    {
        printf("ERROR: malloc yuv420 fail!\n");
        return -1;
    }
    rgb24 = (unsigned char *)malloc(width*height * 3);
    if (NULL == rgb24)
    {
        printf("ERROR: malloc rgb24 fail!\n");
        return -1;
    }

    fseek(yuv_file, 0, SEEK_END);
    filelen = ftell(yuv_file);
    frameno = filelen / (width*height * 3 / 2);
    fseek(yuv_file, 0, SEEK_SET); //++将文件指针重新指向文件开始位置

    if (frameno == 1)
    {
        sprintf(filename, "%s_rgb24.bmp", argv[2]);
    }
    else
    {
        sprintf(filename, "%s.rgb24", argv[2]);
    }
    rgb_file = fopen(filename, "wb");
    if (NULL == rgb_file)
    {
        printf("ERROR: open %s fail!\n", filename);
        return -1;
    }

    framenum = 0;
    bmp_flag = (frameno == 1) ? 1 : 0;
    while (fread(yuv420, sizeof(unsigned char), width*height * 3 / 2, yuv_file) == width*height * 3 / 2)
    {
        yuv420toRGB24(yuv420, rgb24, width, height, bmp_flag);
        printf("%dth frames ok!!!\n", framenum);
        framenum++;
        if (bmp_flag)//++单帧yuv转成bmp图像
        {
            bmp24_write(rgb24, width, height, rgb_file);
        }
        else//++多帧yuv转成rgb24格式视频
        {
            rgb24_write(rgb24, width, height, rgb_file);
        }
    }

    printf("yuv420p to RGB24 succeessfully!!,total frames: %d\n", frameno);

    free(yuv420);
    yuv420 = NULL;
    free(rgb24);
    rgb24 = NULL;
    fclose(yuv_file);
    fclose(rgb_file);
    return 0;
}

4、实验结果

单帧yuv转换成bmp图像：

多帧yuv转换成rgb24格式视频：

---

THE END!

---

本博文只能阅读，谢绝转载，欢迎指出任何有错误或不够清晰的表达。可以在下面评论区评论，也可以邮件至 2963033731@qq.com