State changed to AS_STOPPING too early, depending on kNumAQBufs*kAQDefaultBufSize

[kdepp]

in handleReadFromStream, once eventType == kCFStreamEventEndEncountered, the music file has all been downloaded, it will change the state to AS_STOPPING or AS_STOPPED.

it seems that kCFStreamEventEndEncountered is trigged when all the music data left is in the audio buffer, and then try to CFReadStream again. So, the AS_STOPPING state depends on the whole buffer size, kNumAQBufs*kAQDefaultBufSize.

At that moment, audioBuffer may still have some buffers left to play. In my playlist app, it result in the early stop on the current song and switching to the next.