问视频录制就像会说话的应用程序

EN

    [audioSession setCategory:AVAudioSessionCategoryRecord error:nil]; // assign it to recording session
    [audioSession setActive:YES error:nil]; // activate it!
      NSMutableDictionary* recordSetting = [[NSMutableDictionary alloc] init];
       [recordSetting setValue: [NSNumber numberWithInt:kAudioFormatAppleIMA4]    forKey:AVFormatIDKey]; // assign this special hardware component as the function to record
    [recordSetting setValue:[NSNumber numberWithFloat:44100.0]
    forKey:AVSampleRateKey]; //44100 is the sample rate 
   [recordSetting setValue:[NSNumber numberWithInt: 2]
    forKey:AVNumberOfChannelsKey]; // same thing
   tmpFile = [NSURL fileURLWithPath:
      [NSTemporaryDirectory() stringByAppendingPathComponent:
    [NSString stringWithFormat: @"%.0f.%@",
     [NSDate timeIntervalSinceReferenceDate] * 1000.0,
      @"caf"]]]; // how we identify the audio written to the file to play later
      recorder = [[AVAudioRecorder alloc] initWithURL:tmpFile settings:recordSetting
    [recorder setDelegate:self];
   [recorder prepareToRecord];
   [recorder record];

    AVAudioSession * audioSession = [AVAudioSession sharedInstance];
   [audioSession setCategory:AVAudioSessionCategoryPlayback error:nil];
       [audioSession setActive:YES error:nil];
      AVAudioPlayer * player =
       [[AVAudioPlayer alloc] initWithContentsOfURL:tmpFile error:nil]; // takes recording data from tmpFile where we wrote the recording in
      [player prepareToPlay];
     [player play];