On Mon, May 12, 2014 at 11:02:26AM +0800, 李鑫 wrote:

As we know, mplayer supports waveOut, dsound in Windows, dshow, does support Windows Vista/7?

dsound is supported and for simple use cases even the recommended API even on Windows 7. I am not aware of any good reason to support WASAPI. Of course if someone wants to play with it and send a patch that's still welcome (if you can bear with my slow and nipickish reviews at least).