Recording and saving sound to file

How to record sound and sa开发者_如何学Pythonve to file (after that play it)? I need small-size file (as smaller is better) without reduction of bitrate. How can it be implemented on iPhone?

Hello take a look at this Link

also use this:

//Reduce or Compress the audio file size 1/4
[settings setValue:[NSNumber numberWithInt:kAudioFormatAppleIMA4] forKey:AVFormatIDKey];