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我使用以下设置使用AVAudioRecorder以.mp3格式录制音频文件.

NSDictionary *recordSettings = [[NSDictionary alloc] initWithObjectsAndKeys:

                                        [NSNumber numberWithFloat: 44100.0],AVSampleRateKey,
                                        [NSNumber numberWithInt: kAudioFormatMPEGLayer3],AVFormatIDKey,
                                        [NSNumber numberWithInt: 1], AVNumberOfChannelsKey,
                                        [NSNumber numberWithInt: AVAudioQualityMax],AVEncoderAudioQualityKey,nil];

但不能用这些记录.我搜索了很多但是没能得到一些相关的帖子.有些帖子说这是不可能的.如果不可能那么为什么呢？请回答.

我在http://developer.apple.com/library/ios/#documentation/MusicAudio/Reference/CoreAudioDataTypesRef/Reference/reference.html#//apple_ref/doc/找到了不同值的列表(音频数据格式)UID/TP40004488

音频数据格式标识符音频数据格式的标识符,用于AudioStreamBasicDescription结构.

kAudioFormatLinearPCM ='lpcm',

kAudioFormatAC3 ='ac-3',

kAudioFormat60958AC3 ='cac3',

kAudioFormatAppleIMA4 ='ima4',

kAudioFormatMPEG4AAC ='aac',

kAudioFormatMPEG4CELP ='celp',

kAudioFormatMPEG4HVXC ='hvxc',

kAudioFormatMPEG4TwinVQ ='twvq',

kAudioFormatMACE3 ='MAC3',

kAudioFormatMACE6 ='MAC6',

kAudioFormatULaw ='ulaw',

kAudioFormatALaw ='alaw',

kAudioFormatQDesign ='QDMC',

kAudioFormatQDesign2 ='QDM2',

kAudioFormatQUALCOMM ='Qclp',

kAudioFormatMPEGLayer1 ='.mp1',

kAudioFormatMPEGLayer2 ='.mp2',

kAudioFormatMPEGLayer3 ='.mp3',

kAudioFormatTimeCode ='时间',

kAudioFormatMIDIStream ='midi',

kAudioFormatParameterValueStream ='apvs',

kAudioFormatAppleLossless ='alac'

kAudioFormatMPEG4AAC_HE ='aach',

kAudioFormatMPEG4AAC_LD ='aacl',

kAudioFormatMPEG4AAC_ELD ='aace',

kAudioFormatMPEG4AAC_HE_V2 ='aacp',

kAudioFormatMPEG4AAC_Spatial ='aacs',

kAudioFormatAMR ='samr',

kAudioFormatAudible ='AUDB',

kAudioFormatiLBC ='ilbc',

kAudioFormatDVIIntelIMA = 0x6D730011,

kAudioFormatMicrosoftGSM = 0x6D730031,

kAudioFormatAES3 ='aes3'

但是,我不认为我们可以使用所有提到的格式(例如mp3).

任何人都可以帮助我使用AVAudioRecorder录制声音支持的格式吗？

谢谢.