YUV422 to JPEG ---libjpeg 参考网页

找了好久终于找到一个例子，还没试验，先转载。

转自：http://blog.163.com/shuangxi_p/blog/static/107224272011374405634/

#include "jpeglib.h"

int yuv422_to_jpeg(unsigned char *data, int image_width, int image_height, FILE *fp, int quality)

{

    struct jpeg_compress_struct cinfo;

    struct jpeg_error_mgr jerr;

    JSAMPROW row_pointer[1];  /* pointer to JSAMPLE row[s] */

    int row_stride;    /* physical row width in image buffer */

    JSAMPIMAGE  buffer;

    int band,i,buf_width[3],buf_height[3], mem_size, max_line, counter;

    unsigned char *yuv[3];

    uint8_t *pSrc, *pDst;

    yuv[0] = data;

    yuv[1] = yuv[0] + (image_width * image_height);

    yuv[2] = yuv[1] + (image_width * image_height) /2;

    cinfo.err = jpeg_std_error(&jerr);

    jpeg_create_compress(&cinfo);

    jpeg_stdio_dest(&cinfo, fp);

    cinfo.image_width = image_width;  /* image width and height, in pixels */

    cinfo.image_height = image_height;

    cinfo.input_components = 3;    /* # of color components per pixel */

    cinfo.in_color_space = JCS_RGB;  /* colorspace of input image */

    jpeg_set_defaults(&cinfo);

    jpeg_set_quality(&cinfo, quality, TRUE );

    cinfo.raw_data_in = TRUE;

    cinfo.jpeg_color_space = JCS_YCbCr;

    cinfo.comp_info[0].h_samp_factor = 2;

    cinfo.comp_info[0].v_samp_factor = 1;

    jpeg_start_compress(&cinfo, TRUE);

    buffer = (JSAMPIMAGE) (*cinfo.mem->alloc_small) ((j_common_ptr) &cinfo, JPOOL_IMAGE, 3 * sizeof(JSAMPARRAY));

    for(band=0; band <3; band++)

    {

        buf_width[band] = cinfo.comp_info[band].width_in_blocks * DCTSIZE;

        buf_height[band] = cinfo.comp_info[band].v_samp_factor * DCTSIZE;

        buffer[band] = (*cinfo.mem->alloc_sarray) ((j_common_ptr) &cinfo, JPOOL_IMAGE, buf_width[band], buf_height[band]);

    }

    max_line = cinfo.max_v_samp_factor*DCTSIZE;

    for(counter=0; cinfo.next_scanline < cinfo.image_height; counter++)

    {

        //buffer image copy.

        for(band=0; band <3; band++)

        {

            mem_size = buf_width[band];

            pDst = (uint8_t *) buffer[band][0];

            pSrc = (uint8_t *) yuv[band] + counter*buf_height[band] * buf_width[band];

            for(i=0; i <buf_height[band]; i++)

            {

                memcpy(pDst, pSrc, mem_size);

                pSrc += buf_width[band];

                pDst += buf_width[band];

            }

        }

        jpeg_write_raw_data(&cinfo, buffer, max_line);

    }

    jpeg_finish_compress(&cinfo);

    jpeg_destroy_compress(&cinfo);

    return 0;

}

1.http://blog.csdn.net/huxiangyang4/archive/2010/07/12/5728888.aspx 最好的示例

2.http://blog.csdn.net/axlrosek/archive/2007/03/29/1545496.aspx 当字典用

3.http://topic.csdn.net/u/20100518/17/98f52459-3158-492a-b6df-b1863336c6bb.html 改jpeglib.h头文件版本

4.http://blog.csdn.net/achellies/archive/2009/06/04/4238056.aspx 参考介绍