Hi,all How are you? I found a source code for mp3 decorder using libmad library. It is called MADAudioFormatReader. if you do not know, it is not a big deal. In this code, It can handle the stereo (2 channles )mp3 file, However, it can not handle single channel mp3 file. What's the decorder difference between one channel and two channels mp3 file? I do not think there is a big difference. I think the key is to know the structure in data chunks for both case and use the right function in MAD. Am I right? Could you give me some clue? I attach the file to this email for reference. Best

Leon