Hi I download the libvorbis-1.1.1 and use the encoderexample.c and decoderexample.c to drive it. The parameters i used is samplingrate: 44.1kbps, channel number: 2, quality :0.4. Now I want to compare it\\\'s complexity with MPEG-2 AAC, but don\\\'t know how to trace into the lib , can you tell me how to do that or tell me how many addtions and multiples does the vorbis use under those parameters ? anyway,praciate for your help. ______________________________________ ????2G????? http://mail.sina.com.cn/chooseMode.html ? ===================================================================