How do I record audio on iPhone with AVAudioRecorder

Question

Now that iPhone 3 0 SDK is public  I think I can ask this question for those of you that have already been playing with the 3 0 SDK  I want to record audio in my application  but I want to use AVAudioRecorder and not the older way of recording like the example SpeakHere shows   There are not any examples of how to best do this in the iPhone Dev Center and only reference to the classes  I am a newbie at iPhone development  so I am looking for a simple sample to get me started

User · Answer

Great Thanks to  Massimo Cafaro and Shaybc I was able achieve below tasks in iOS 8    Record audio  amp  Save Play Saved Recording  1 Add  quot AVFoundation framework quot  to your project in  h file 2 Add below import statement  AVFoundation AVFoundation h   3 Define  quot AVAudioRecorderDelegate quot  4 Create a layout with Record  Play buttons and their action methids 5 Define Recorder and Player etc  Here is the complete example code which may help you   ViewController h   import  lt UIKit UIKit h gt   import  lt AVFoundation AVFoundation h gt    interface ViewController   UIViewController  lt AVAudioRecorderDelegate gt    property nonatomic strong  AVAudioRecorder  recorder   property nonatomic strong  NSMutableDictionary  recorderSettings   property nonatomic strong  NSString  recorderFilePath   property nonatomic strong  AVAudioPlayer  audioPlayer   property nonatomic strong  NSString  audioFileName   -  IBAction startRecording  id sender  -  IBAction stopRecording  id sender   -  IBAction startPlaying  id sender  -  IBAction stopPlaying  id sender    end  Then do the job in  ViewController m   import  quot ViewController h quot    define DOCUMENTS FOLDER  NSHomeDirectory   stringByAppendingPathComponent   quot Documents quot     interface ViewController     end   implementation ViewController   synthesize recorder recorderSettings recorderFilePath   synthesize audioPlayer audioFileName     pragma mark - View Controller Life cycle methods -  void viewDidLoad        super viewDidLoad     -  void didReceiveMemoryWarning        super didReceiveMemoryWarning        pragma mark - Audio Recording -  IBAction startRecording  id sender       AVAudioSession  audioSession    AVAudioSession sharedInstance       NSError  err   nil       audioSession setCategory  AVAudioSessionCategoryPlayAndRecord error  amp err       if err                NSLog   quot audioSession      ld    quot    err domain    long  err code     err userInfo  description            return             audioSession setActive YES error  amp err       err   nil      if err                NSLog   quot audioSession      ld    quot    err domain    long  err code     err userInfo  description            return                 recorderSettings     NSMutableDictionary alloc  init        recorderSettings setValue   NSNumber numberWithInt kAudioFormatLinearPCM  forKey AVFormatIDKey        recorderSettings setValue  NSNumber numberWithFloat 44100 0  forKey AVSampleRateKey        recorderSettings setValue  NSNumber numberWithInt  2  forKey AVNumberOfChannelsKey        recorderSettings setValue   NSNumber numberWithInt 16  forKey AVLinearPCMBitDepthKey        recorderSettings setValue   NSNumber numberWithBool NO  forKey AVLinearPCMIsBigEndianKey        recorderSettings setValue   NSNumber numberWithBool NO  forKey AVLinearPCMIsFloatKey               Create a new audio file     audioFileName     quot recordingTestFile quot       recorderFilePath    NSString stringWithFormat   quot       caf quot   DOCUMENTS FOLDER  audioFileName             NSURL  url    NSURL fileURLWithPath recorderFilePath       err   nil      recorder      AVAudioRecorder alloc  initWithURL url settings recorderSettings error  amp err       if  recorder           NSLog   quot recorder      ld    quot    err domain    long  err code     err userInfo  description            UIAlertView  alert             UIAlertView alloc  initWithTitle    quot Warning quot  message   err localizedDescription  delegate  nil                          cancelButtonTitle   quot OK quot  otherButtonTitles nil            alert show           return                   prepare to record      recorder setDelegate self        recorder prepareToRecord       recorder meteringEnabled   YES           BOOL audioHWAvailable   audioSession inputIsAvailable      if    audioHWAvailable            UIAlertView  cantRecordAlert             UIAlertView alloc  initWithTitle    quot Warning quot message    quot Audio input hardware not available quot                                    delegate  nil cancelButtonTitle   quot OK quot  otherButtonTitles nil            cantRecordAlert show           return                    start recording      recorder recordForDuration  NSTimeInterval  60    Maximum recording time   60 seconds default     NSLog   quot Recroding Started quot       -  IBAction stopRecording  id sender        recorder stop       NSLog   quot Recording Stopped quot       -  void audioRecorderDidFinishRecording  AVAudioRecorder    aRecorder successfully  BOOL flag       NSLog    quot audioRecorderDidFinishRecording successfully  quot         pragma mark - Audio Playing -  IBAction startPlaying  id sender       NSLog   quot playRecording quot             AVAudioSession  audioSession    AVAudioSession sharedInstance        audioSession setCategory AVAudioSessionCategoryPlayback error nil             NSURL  url    NSURL fileURLWithPath  NSString stringWithFormat   quot       caf quot   DOCUMENTS FOLDER  audioFileName        NSError  error      audioPlayer     AVAudioPlayer alloc  initWithContentsOfURL url error  amp error       audioPlayer numberOfLoops   0       audioPlayer play       NSLog   quot playing quot      -  IBAction stopPlaying  id sender        audioPlayer stop       NSLog   quot stopped quot        end

User · Answer

Ok so the answer I got helped me in the right direction and I am very thankful   It helped me figure out how to actually record on the iPhone  but I thought I would also include some helpful code I got from the iPhone Reference Library   AudioandVideoTechnologies  I used this code and added it to the avTouch example fairly easily   With the above code sample and the sample from the reference library  I was able to get this to work pretty good

User · Answer

- void viewDidLoad       Setup audio session     AVAudioSession  session    AVAudioSession sharedInstance        session setCategory AVAudioSessionCategoryPlayAndRecord error nil           Define the recorder setting     NSMutableDictionary  recordSetting     NSMutableDictionary alloc  init         recordSetting setValue  NSNumber numberWithInt kAudioFormatMPEG4AAC  forKey AVFormatIDKey        recordSetting setValue  NSNumber numberWithFloat 44100 0  forKey AVSampleRateKey        recordSetting setValue  NSNumber numberWithInt  2  forKey AVNumberOfChannelsKey           Initiate and prepare the recorder     recorder     AVAudioRecorder alloc  initWithURL outputFileURL settings recordSetting error NULL       recorder delegate   self      recorder meteringEnabled   YES       recorder prepareToRecord           -  IBAction btnRecordDidClicked  UIButton   sender           if  player1 playing                 player1 stop                      if   recorder recording                AVAudioSession  session    AVAudioSession sharedInstance                session setActive YES error nil                   Start recording              recorder record                 recordTapped setTitle   Pause  forState UIControlStateNormal              else                   Pause recording              recorder pause                 recordTapped setTitle   Record  forState UIControlStateNormal                        stopTapped setEnabled YES             playTapped setEnabled NO               -  IBAction btnPlayDidClicked  UIButton   sender           if   recorder recording               player1     AVAudioPlayer alloc  initWithContentsOfURL recorder url error nil                player1 setDelegate self                player1 play                        -  IBAction btnStopDidClicked  UIButton   sender            recorder stop           AVAudioSession  audioSession    AVAudioSession sharedInstance            audioSession setActive NO error nil              -  void  audioRecorderDidFinishRecording  AVAudioRecorder   avrecorder successfully  BOOL flag            recordTapped setTitle   play  forState UIControlStateNormal              stopTapped setEnabled NO             playTapped setEnabled YES

User · Answer

In the following link you can find useful info about recording with AVAudioRecording  In this link in the first part  USing Audio  there is an anchor named    Recording with the AVAudioRecorder Class     that leads you to the example   AudioVideo Conceptual MultimediaPG

User · Answer

Its really helpful  The only problem i had was the size of sound file created after recording  I needed to reduce the file size so i did some changes in settings   NSMutableDictionary  recordSetting     NSMutableDictionary alloc  init    recordSetting setValue   NSNumber numberWithInt kAudioFormatAppleIMA4  forKey AVFormatIDKey    recordSetting setValue  NSNumber numberWithFloat 16000 0  forKey AVSampleRateKey    recordSetting setValue  NSNumber numberWithInt  1  forKey AVNumberOfChannelsKey     File size reduced from 360kb to just 25kb  2 seconds recording

User · Answer

I have uploaded a sample project  You can take a look   VoiceRecorder

User · Answer

for wav format below audio setting  NSDictionary  audioSetting    NSDictionary dictionaryWithObjectsAndKeys                                 NSNumber numberWithFloat 44100 0  AVSampleRateKey                                 NSNumber numberWithInt 2  AVNumberOfChannelsKey                                 NSNumber numberWithInt 16  AVLinearPCMBitDepthKey                                 NSNumber numberWithInt kAudioFormatLinearPCM  AVFormatIDKey                                 NSNumber numberWithBool NO   AVLinearPCMIsFloatKey                                  NSNumber numberWithBool 0   AVLinearPCMIsBigEndianKey                                 NSNumber numberWithBool NO   AVLinearPCMIsNonInterleaved                                 NSData data   AVChannelLayoutKey  nil     ref  http   objective-audio jp 2010 09 avassetreaderavassetwriter html

User · Answer

Actually  there are no examples at all  Here is my working code  Recording is triggered by the user pressing a button on the navBar  The recording uses cd quality  44100 samples   stereo  2 channels  linear pcm  Beware  if you want to use a different format  especially an encoded one  make sure you fully understand how to set the AVAudioRecorder settings  read carefully the audio types documentation   otherwise you will never be able to initialize it correctly  One more thing  In the code  I am not showing how to handle metering data  but you can figure it out easily  Finally  note that the AVAudioRecorder method deleteRecording as of this writing crashes your application  This is why I am removing the recorded file through the File Manager  When recording is done  I save the recorded audio as NSData in the currently edited object using KVC    define DOCUMENTS FOLDER  NSHomeDirectory   stringByAppendingPathComponent   Documents     -  void  startRecording   UIBarButtonItem  stopButton     UIBarButtonItem alloc  initWithTitle   Stop  style UIBarButtonItemStyleBordered  target self action  selector stopRecording    self navigationItem rightBarButtonItem   stopButton   stopButton release    AVAudioSession  audioSession    AVAudioSession sharedInstance   NSError  err   nil   audioSession setCategory  AVAudioSessionCategoryPlayAndRecord error  amp err   if err       NSLog   audioSession      d       err domain    err code     err userInfo  description        return     audioSession setActive YES error  amp err   err   nil  if err       NSLog   audioSession      d       err domain    err code     err userInfo  description        return     recordSetting     NSMutableDictionary alloc  init     recordSetting setValue   NSNumber numberWithInt kAudioFormatLinearPCM  forKey AVFormatIDKey    recordSetting setValue  NSNumber numberWithFloat 44100 0  forKey AVSampleRateKey     recordSetting setValue  NSNumber numberWithInt  2  forKey AVNumberOfChannelsKey     recordSetting setValue   NSNumber numberWithInt 16  forKey AVLinearPCMBitDepthKey    recordSetting setValue   NSNumber numberWithBool NO  forKey AVLinearPCMIsBigEndianKey    recordSetting setValue   NSNumber numberWithBool NO  forKey AVLinearPCMIsFloatKey         Create a new dated file NSDate  now    NSDate dateWithTimeIntervalSinceNow 0   NSString  caldate    now description   recorderFilePath     NSString stringWithFormat         caf   DOCUMENTS FOLDER  caldate  retain    NSURL  url    NSURL fileURLWithPath recorderFilePath   err   nil  recorder      AVAudioRecorder alloc  initWithURL url settings recordSetting error  amp err   if  recorder       NSLog   recorder      d       err domain    err code     err userInfo  description        UIAlertView  alert         UIAlertView alloc  initWithTitle    Warning                                 message   err localizedDescription                                delegate  nil                      cancelButtonTitle   OK                       otherButtonTitles nil        alert show        alert release       return       prepare to record  recorder setDelegate self    recorder prepareToRecord   recorder meteringEnabled   YES   BOOL audioHWAvailable   audioSession inputIsAvailable  if    audioHWAvailable        UIAlertView  cantRecordAlert         UIAlertView alloc  initWithTitle    Warning                                 message    Audio input hardware not available                                delegate  nil                      cancelButtonTitle   OK                       otherButtonTitles nil        cantRecordAlert show        cantRecordAlert release        return        start recording  recorder recordForDuration  NSTimeInterval  10       -  void  stopRecording    recorder stop    NSURL  url    NSURL fileURLWithPath  recorderFilePath   NSError  err   nil  NSData  audioData    NSData dataWithContentsOfFile  url path  options  0 error  amp err   if  audioData      NSLog   audio data      d       err domain    err code     err userInfo  description     editedObject setValue  NSData dataWithContentsOfURL url  forKey editedFieldKey          recorder deleteRecording     NSFileManager  fm    NSFileManager defaultManager    err   nil   fm removeItemAtPath  url path  error  amp err   if err      NSLog   File Manager      d       err domain    err code     err userInfo  description       UIBarButtonItem  startButton     UIBarButtonItem alloc  initWithTitle   Record  style UIBarButtonItemStyleBordered  target self action  selector startRecording    self navigationItem rightBarButtonItem   startButton   startButton release       -  void audioRecorderDidFinishRecording  AVAudioRecorder    aRecorder successfully  BOOL flag    NSLog    audioRecorderDidFinishRecording successfully        your actions here

User · Answer

As per the above answers  I made some changes and I got the correct output   Step 1  Under  inf plist  add the Microphone usage permissions          lt key gt NSMicrophoneUsageDescription lt  key gt     lt string gt   PRODUCT NAME  Microphone Usage lt  string gt    Step 2    Save record audio file into Local Document Directory Play Stop recording Get the Duration of Saved audio file   Here is the source code  Please have a look at once and use it   ViewController h   import  lt UIKit UIKit h gt   import  lt AVFoundation AVFoundation h gt    interface ViewController   UIViewController  AVAudioPlayer  audioPlayer  AVAudioRecorder  audioRecorder     - IBAction  startRecording  - IBAction  stopRecording  - IBAction  playRecording  - IBAction  stopPlaying    end   ViewController m   import  ViewController h   interface ViewController     lt AVAudioRecorderDelegate  AVAudioPlayerDelegate gt    end   implementation ViewController  -  void viewDidLoad    super viewDidLoad      Do any additional setup after loading the view  typically from a nib     - IBAction  startRecording     Setup audio session AVAudioSession  audioSession    AVAudioSession sharedInstance   NSError  err   nil   audioSession setCategory  AVAudioSessionCategoryPlayAndRecord error  amp err   if err        NSLog   audioSession      ld       err domain    long  err code     err userInfo  description        return     audioSession setActive YES error  amp err   err   nil  if err        NSLog   audioSession      ld       err domain    long  err code     err userInfo  description        return    AVAudioSessionRecordPermission permissionStatus    audioSession recordPermission   switch  permissionStatus        case AVAudioSessionRecordPermissionUndetermined             AVAudioSession sharedInstance  requestRecordPermission   BOOL granted                   CALL YOUR METHOD HERE - as this assumes being called only once from user interacting with permission alert              if  granted                       Microphone enabled code                 NSLog   Mic permission granted   Call method for granted stuff                      self startRecordingAudioSound                             else                      Microphone disabled code                 NSLog   Mic permission indeterminate  Call method for indeterminate stuff                               UIApplication sharedApplication   openURL NSURL string  UIApplicationOpenSettingsURLString                                      break            case AVAudioSessionRecordPermissionDenied             direct to settings            NSLog   Mic permission denied  Call method for denied stuff              break      case AVAudioSessionRecordPermissionGranted             mic access ok            NSLog   Mic permission granted   Call method for granted stuff              self startRecordingAudioSound           break      default             this should not happen   maybe throw an exception          break        pragma mark - Audio Recording -  BOOL startRecordingAudioSound  NSError  error   nil  NSMutableDictionary  recorderSettings     NSMutableDictionary alloc  init    recorderSettings setValue   NSNumber numberWithInt kAudioFormatLinearPCM  forKey AVFormatIDKey    recorderSettings setValue  NSNumber numberWithFloat 44100 0  forKey AVSampleRateKey    recorderSettings setValue  NSNumber numberWithInt  2  forKey AVNumberOfChannelsKey    recorderSettings setValue   NSNumber numberWithInt 16  forKey AVLinearPCMBitDepthKey    recorderSettings setValue   NSNumber numberWithBool NO  forKey AVLinearPCMIsBigEndianKey    recorderSettings setValue   NSNumber numberWithBool NO  forKey AVLinearPCMIsFloatKey       Create a new audio file NSArray  searchPaths   NSSearchPathForDirectoriesInDomains NSDocumentDirectory  NSUserDomainMask  YES   NSString  documentPath     searchPaths objectAtIndex  0   NSString  pathToSave    documentPath  stringByAppendingPathComponent  self dateString    NSLog   the path is     pathToSave       File URL NSURL  url    NSURL fileURLWithPath pathToSave    FILEPATH      Save recording path to preferences NSUserDefaults  prefs    NSUserDefaults standardUserDefaults    prefs setURL url forKey   Test1     prefs synchronize    audioRecorder     AVAudioRecorder alloc  initWithURL url settings recorderSettings error  amp error   if   audioRecorder        NSLog   Error establishing recorder       error localizedFailureReason       return NO        Initialize degate  metering  etc  audioRecorder delegate   self  audioRecorder meteringEnabled   YES    self title     0 00    if    audioRecorder prepareToRecord         NSLog   Error  Prepare to record failed           self say   Error while preparing recording        return NO     if    audioRecorder record         NSLog   Error  Record failed             self say   Error while attempting to record audio        return NO    NSLog   Recroding Started    return YES      pragma mark - AVAudioRecorderDelegate -  void  audioRecorderDidFinishRecording  AVAudioRecorder   avrecorder successfully  BOOL flag  NSLog    audioRecorderDidFinishRecording successfully         pragma mark - AVAudioPlayerDelegate -  void  audioPlayerDidFinishPlaying  AVAudioPlayer   player successfully  BOOL flag  NSLog    audioPlayerDidFinishPlaying successfully        -  NSString    dateString      return a formatted string for a file name NSDateFormatter  formatter     NSDateFormatter alloc  init   formatter dateFormat     ddMMMYY hhmmssa   return   formatter stringFromDate  NSDate date  stringByAppendingString    aif       - IBAction  stopRecording  NSLog   stopRecording     audioRecorder stop   NSLog   stopped       - IBAction  playRecording    Load recording path from preferences NSUserDefaults  prefs    NSUserDefaults standardUserDefaults   NSURL  temporaryRecFile    prefs URLForKey   Test1       Get Duration of Audio File AVURLAsset  audioAsset    AVURLAsset URLAssetWithURL temporaryRecFile options nil   CMTime audioDuration   audioAsset duration  float audioDurationSeconds   CMTimeGetSeconds audioDuration   NSLog   Duration Of Audio   f   audioDurationSeconds    audioPlayer     AVAudioPlayer alloc  initWithContentsOfURL temporaryRecFile error nil   audioPlayer delegate   self   audioPlayer setNumberOfLoops 0   audioPlayer volume   1   audioPlayer prepareToPlay    audioPlayer play   NSLog   playing       - IBAction  stopPlaying  NSLog   stopPlaying     audioPlayer stop   NSLog   stopped          end

User · Answer

I ve been trying to get this code to work for the last 2 hours and though it showed no error on the simulator  there was one on the device    Turns out  at least in my case that the error came from directory used  bundle     NSURL  url    NSURL fileURLWithPath  NSString stringWithFormat      recordTest caf     NSBundle mainBundle  resourcePath       It was not writable or something like this    There was no error except the fact that prepareToRecord failed     I therefore replaced it by    NSArray  paths   NSSearchPathForDirectoriesInDomains NSDocumentDirectory  NSUserDomainMask  YES   NSString  recDir    paths objectAtIndex 0   NSURL  url    NSURL fileURLWithPath  NSString stringWithFormat      recordTest caf   recDir     It now Works like a Charm   Hope this helps others

User · Answer

This is from Multimedia programming guide     -  IBAction  recordOrStop   id  sender   if  recording         soundRecorder stop       recording   NO      self soundRecorder   nil       recordOrStopButton setTitle    Record  forState       UIControlStateNormal        recordOrStopButton setTitle    Record  forState       UIControlStateHighlighted         AVAudioSession sharedInstance  setActive  NO error nil      else         AVAudioSession sharedInstance       setCategory  AVAudioSessionCategoryRecord      error  nil       NSDictionary  recordSettings         NSDictionary alloc  initWithObjectsAndKeys  NSNumber numberWithFloat  44100 0   AVSampleRateKey        NSNumber numberWithInt  kAudioFormatAppleLossless   AVFormatIDKey        NSNumber numberWithInt  1   AVNumberOfChannelsKey        NSNumber numberWithInt  AVAudioQualityMax        AVEncoderAudioQualityKey       nil       AVAudioRecorder  newRecorder         AVAudioRecorder alloc  initWithURL  soundFileURL                                 settings  recordSettings                                    error  nil        recordSettings release       self soundRecorder   newRecorder       newRecorder release       soundRecorder delegate   self       soundRecorder prepareToRecord        soundRecorder record        recordOrStopButton setTitle    Stop  forState  UIControlStateNormal        recordOrStopButton setTitle    Stop  forState  UIControlStateHighlighted       recording   YES

User · Answer

START  NSError  sessionError   nil    AVAudioSession sharedInstance  setDelegate self     AVAudioSession sharedInstance  setCategory AVAudioSessionCategoryPlayAndRecord error  amp sessionError     AVAudioSession sharedInstance  setActive  YES error  nil   UInt32 doChangeDefaultRoute   1  AudioSessionSetProperty kAudioSessionProperty OverrideCategoryDefaultToSpeaker  sizeof doChangeDefaultRoute    amp doChangeDefaultRoute    NSError  error   nil  NSString  filename    NSString stringWithFormat      caf  FILENAME   NSString  path     NSHomeDirectory   stringByAppendingPathComponent   Documents   stringByAppendingPathComponent filename   NSURL  soundFileURL    NSURL fileURLWithPath path     NSDictionary  recordSettings    NSDictionary dictionaryWithObjectsAndKeys                                   NSNumber numberWithInt  kAudioFormatMPEG4AAC   AVFormatIDKey                                   NSNumber numberWithInt AVAudioQualityMedium  AVEncoderAudioQualityKey                                   NSNumber numberWithInt AVAudioQualityMedium   AVSampleRateConverterAudioQualityKey                                   NSNumber numberWithInt  1   AVNumberOfChannelsKey                                   NSNumber numberWithFloat 22050 0  AVSampleRateKey                                  nil    AVAudioRecorder  audioRecorder     AVAudioRecorder alloc                   initWithURL soundFileURL                  settings recordSettings                  error  amp error     if   error  amp  amp   audioRecorder prepareToRecord          audioRecorder record       STOP   audioRecorder stop    audioRecorder release   audioRecorder   nil

User · Answer

Although this is an answered question  and kind of old  i have decided to post my full working code for others that found it hard to find good working  out of the box  playing and recording example - including encoded  pcm  play via speaker  write to file here it is   AudioPlayerViewController h    import  lt UIKit UIKit h gt   import  lt AVFoundation AVFoundation h gt    interface AudioPlayerViewController   UIViewController   AVAudioPlayer  audioPlayer  AVAudioRecorder  audioRecorder  int recordEncoding  enum       ENC AAC   1      ENC ALAC   2      ENC IMA4   3      ENC ILBC   4      ENC ULAW   5      ENC PCM   6    encodingTypes     - IBAction  startRecording  - IBAction  stopRecording  - IBAction  playRecording  - IBAction  stopPlaying    end   AudioPlayerViewController m    import  AudioPlayerViewController h    implementation AudioPlayerViewController  -  void viewDidLoad        super viewDidLoad       recordEncoding   ENC AAC     - IBAction  startRecording   NSLog   startRecording     audioRecorder release   audioRecorder   nil      Init audio with record capability AVAudioSession  audioSession    AVAudioSession sharedInstance    audioSession setCategory AVAudioSessionCategoryRecord error nil    NSMutableDictionary  recordSettings     NSMutableDictionary alloc  initWithCapacity 10   if recordEncoding    ENC PCM         recordSettings setObject  NSNumber numberWithInt  kAudioFormatLinearPCM  forKey  AVFormatIDKey        recordSettings setObject  NSNumber numberWithFloat 44100 0  forKey  AVSampleRateKey        recordSettings setObject  NSNumber numberWithInt 2  forKey AVNumberOfChannelsKey        recordSettings setObject  NSNumber numberWithInt 16  forKey AVLinearPCMBitDepthKey        recordSettings setObject  NSNumber numberWithBool NO  forKey AVLinearPCMIsBigEndianKey        recordSettings setObject  NSNumber numberWithBool NO  forKey AVLinearPCMIsFloatKey        else       NSNumber  formatObject       switch  recordEncoding            case  ENC AAC                formatObject    NSNumber numberWithInt  kAudioFormatMPEG4AAC               break          case  ENC ALAC               formatObject    NSNumber numberWithInt  kAudioFormatAppleLossless               break          case  ENC IMA4               formatObject    NSNumber numberWithInt  kAudioFormatAppleIMA4               break          case  ENC ILBC               formatObject    NSNumber numberWithInt  kAudioFormatiLBC               break          case  ENC ULAW               formatObject    NSNumber numberWithInt  kAudioFormatULaw               break          default              formatObject    NSNumber numberWithInt  kAudioFormatAppleIMA4               recordSettings setObject formatObject forKey  AVFormatIDKey        recordSettings setObject  NSNumber numberWithFloat 44100 0  forKey  AVSampleRateKey        recordSettings setObject  NSNumber numberWithInt 2  forKey AVNumberOfChannelsKey        recordSettings setObject  NSNumber numberWithInt 12800  forKey AVEncoderBitRateKey        recordSettings setObject  NSNumber numberWithInt 16  forKey AVLinearPCMBitDepthKey        recordSettings setObject  NSNumber numberWithInt  AVAudioQualityHigh  forKey  AVEncoderAudioQualityKey      NSURL  url    NSURL fileURLWithPath  NSString stringWithFormat      recordTest caf     NSBundle mainBundle  resourcePath       NSError  error   nil  audioRecorder      AVAudioRecorder alloc  initWithURL url settings recordSettings error  amp error    if   audioRecorder prepareToRecord     YES        audioRecorder record    else       int errorCode   CFSwapInt32HostToBig   error code         NSLog   Error       4 4s       error localizedDescription    char   amp errorCode       NSLog   recording       - IBAction  stopRecording   NSLog   stopRecording     audioRecorder stop   NSLog   stopped       - IBAction  playRecording   NSLog   playRecording       Init audio with playback capability AVAudioSession  audioSession    AVAudioSession sharedInstance    audioSession setCategory AVAudioSessionCategoryPlayback error nil    NSURL  url    NSURL fileURLWithPath  NSString stringWithFormat      recordTest caf     NSBundle mainBundle  resourcePath     NSError  error  audioPlayer     AVAudioPlayer alloc  initWithContentsOfURL url error  amp error   audioPlayer numberOfLoops   0   audioPlayer play   NSLog   playing       - IBAction  stopPlaying   NSLog   stopPlaying     audioPlayer stop   NSLog   stopped       -  void dealloc    audioPlayer release    audioRecorder release    super dealloc       end   Hope this will help some of you guys

[ios] How do I record audio on iPhone with AVAudioRecorder?

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