这是一个简单的jpeg编码程序，支持1：1：1采样的baseline彩色jpeg，输入只能是24bit原始图像数据文件，在linux下通过 -This is a simple jpeg coding procedures, support 1:1 : a sampling of the color jpeg baseline, the importation of only 24bit original image data files, adopted in linux

This file contains routines to write JPEG datastream markers.Returns the precision used (0 = 8bits, 1 = 16bits) for baseline checking {.

This JPEG decoding API supports Baseline profile only.