使用jpeglib直接把NV12转为jpeg文件的代码

　　在网上找了好几套，结果都不对。后来终于找到一套，还缺了一点。于是连蒙带猜，终于保存成功了。

• github的开源

吾已将此代码开源到github，会进行维护工作。请优待去github：

GitHub - quantum6/NV12ToJpgByJpegLib

• 编译jpeglib

LINUX下载编译jpeglib_柳鲲鹏的博客-CSDN博客_jpeglib库linux下载

• 源码

#include
#include
#include

#include

#define JPEG_QUALITY 75

int Nv12ToJpgFile(const char *pJpgFile,
    const char* pYUVBuffer, const int nWidth, const int nHeight)
{
    struct jpeg_compress_struct cinfo;
    struct jpeg_error_mgr jerr;
    JSAMPROW row_pointer[1];  
    FILE * pJpegFile = NULL;
    unsigned char *yuvbuf = NULL;
    unsigned char *ybase = NULL, *ubase = NULL;
    int i=0, j=0;
    int idx=0;
 
    cinfo.err = jpeg_std_error(&jerr);
    jpeg_create_compress(&cinfo);
 
    if ((pJpegFile = fopen(pJpgFile, "wb")) == NULL)
    {    
        return -1;
    }    
    jpeg_stdio_dest(&cinfo, pJpegFile);

    // image width and height, in pixels

    cinfo.image_width      = nWidth;
    cinfo.image_height     = nHeight;    
    cinfo.input_components = 3;    // # of color components per pixel
    cinfo.in_color_space   = JCS_YCbCr;  //colorspace of input image
    jpeg_set_defaults(&cinfo);
    jpeg_set_quality(&cinfo, JPEG_QUALITY, TRUE );

    cinfo.jpeg_color_space = JCS_YCbCr;
    cinfo.comp_info[0].h_samp_factor = 2;
    cinfo.comp_info[0].v_samp_factor = 2;
    jpeg_start_compress(&cinfo, TRUE);

    yuvbuf=(unsigned char *)malloc(nWidth*3);
    if(yuvbuf == NULL)
    {
        return -1;
    }
    memset(yuvbuf, 0, nWidth*3);

    ybase=(unsigned char *)pYUVBuffer;
    ubase=(unsigned char *)(pYUVBuffer+nWidth*nHeight);
    while (cinfo.next_scanline < cinfo.image_height)
    {
        idx=0;
        for(i=0;i