使用jpeg版本：jpegsrc.v9a.tar.gz

configure参数：./configure --prefix=/usr/local/jpeglib_arm/ --host=arm-none-linux-gnueabi

之后make； make install

调用jpeg接口

1. /*
   
2. ????将bgr数据转换为jpg图像存储
   
3. ????filename: 生成的jpg文件名
   
4. ????width height:????传入bmp file 的宽和高
   
5. ????pBGRBuffer:????传入bgr数据
   
6. */
   
7. int convert_to_jpg(char *filename, int width, int height, unsigned char *pBGRBuffer)
   
8. {
   
9. ????FILE *fJpg;
   
10. ????struct jpeg_compress_struct cinfo;
    
11. ????struct jpeg_error_mgr jerr;
    
12. ????JSAMPROW row_pointer[1];
    
13. ????int row_stride;
    
14. 
    
15. ????cinfo.err = jpeg_std_error(&jerr);
    
16. ????jpeg_create_compress(&cinfo);
    
17. ????fJpg = fopen(filename, "wb");
    
18. ????if(fJpg == NULL){
    
19. ????????debugE("Cannot open file %s\n", filename);
    
20. ????????return -1;
    
21. ????}
    
22. ????jpeg_stdio_dest(&cinfo, fJpg);
    
23. ????cinfo.image_width = width;
    
24. ????cinfo.image_height = height;
    
25. ????cinfo.input_components = 3;
    
26. ????cinfo.in_color_space = JCS_RGB;
    
27. ????jpeg_set_defaults(&cinfo);
    
28. ????jpeg_set_quality(&cinfo, 30, TRUE);
    
29. ????jpeg_start_compress(&cinfo, TRUE);
    
30. ????row_stride = cinfo.image_width * 3;????/* JSAMPLEs per row in image_buffer */
    
31. ????while (cinfo.next_scanline < cinfo.image_height) {
    
32. ????????/* jpeg_write_scanlines expects an array of pointers to scanlines.
    
33. ???????? * Here the array is only one element long, but you could pass
    
34. ???????? * more than one scanline at a time if that's more convenient.
    
35. ???????? */
    
36. ????????//row_pointer[0] = & pBMPBuffer[cinfo.next_scanline * row_stride];
    
37. ????????row_pointer[0] = &pBGRBuffer[row_stride*(cinfo.image_height - cinfo.next_scanline - 1)];
    
38. ????????(void) jpeg_write_scanlines(&cinfo, row_pointer, 1);
    
39. ????}
    
40. 
    
41. ????jpeg_finish_compress(&cinfo);
    
42. ????jpeg_destroy_compress(&cinfo);
    
43. ????fclose(fJpg);
    
44. 
    
45. ????return 0;
    
46. }
47.