sample.m

- (AudioStreamBasicDescription)getAudioDescription {
    AudioStreamBasicDescription audioDescription = {0};
    audioDescription.mSampleRate        = 48000.00;
    audioDescription.mFormatID          = kAudioFormatLinearPCM;
    audioDescription.mFormatFlags       = kAudioFormatFlagIsBigEndian;
    audioDescription.mFramesPerPacket   = 1;
    audioDescription.mChannelsPerFrame  = 2;
    audioDescription.mBitsPerChannel    = 8;
    audioDescription.mBytesPerPacket    = 2;
    audioDescription.mBytesPerFrame     = 2;
return audioDescription;
}