[linux-audio-dev] I need help! I can't handle the problem about full-duplex (playback & record) programming

Hi, guys, I am working on a project in which I need to implement palyback and recording on the same sound card and in the same time. I open the soundcard with RDWR mode and used 'select' to wait for sound data on card and read it. After that, I receive audio data from socket and write this data into buffer on card. for now. I tested it and i found if just one way, ie. just read or write, it works fine, the quality of sound is fine. but if two way, ie. play&record, the sound is horrible and the weird is that I always get better sound quality from playback that what i got from recording. (I heard the audio from two ends). by the way, I used SNDCTL_DSP_TRIGGER to syncronyse them. can this method implement full-duplex functions ? if not, what should I do? thanks in advance leo __________________________________________________ Do you Yahoo!? Yahoo! Mail Plus - Powerful. Affordable. Sign up now. http://mailplus.yahoo.com