[英]what are the formats supported in AVAudioRecorder for recording sound?
I have found a list of the different values (Audio Data Format) at http://developer.apple.com/library/ios/#documentation/MusicAudio/Reference/CoreAudioDataTypesRef/Reference/reference.html#//apple_ref/doc/uid/TP40004488 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
Audio Data Format Identifiers Identifiers for audio data formats, used in the AudioStreamBasicDescription structure. 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', kAudioFormatLinearPCM ='lpcm',
kAudioFormatAC3 = 'ac-3', kAudioFormatAC3 ='ac-3',
kAudioFormat60958AC3 = 'cac3', kAudioFormat60958AC3 ='cac3',
kAudioFormatAppleIMA4 = 'ima4', kAudioFormatAppleIMA4 ='ima4',
kAudioFormatMPEG4AAC = 'aac ', kAudioFormatMPEG4AAC ='aac',
kAudioFormatMPEG4CELP = 'celp', kAudioFormatMPEG4CELP ='celp',
kAudioFormatMPEG4HVXC = 'hvxc', kAudioFormatMPEG4HVXC ='hvxc',
kAudioFormatMPEG4TwinVQ = 'twvq', kAudioFormatMPEG4TwinVQ ='twvq',
kAudioFormatMACE3 = 'MAC3', kAudioFormatMACE3 ='MAC3',
kAudioFormatMACE6 = 'MAC6', kAudioFormatMACE6 ='MAC6',
kAudioFormatULaw = 'ulaw', kAudioFormatULaw ='ulaw',
kAudioFormatALaw = 'alaw', kAudioFormatALaw ='alaw',
kAudioFormatQDesign = 'QDMC', kAudioFormatQDesign ='QDMC',
kAudioFormatQDesign2 = 'QDM2', kAudioFormatQDesign2 ='QDM2',
kAudioFormatQUALCOMM = 'Qclp', kAudioFormatQUALCOMM ='Qclp',
kAudioFormatMPEGLayer1 = '.mp1', kAudioFormatMPEGLayer1 ='。mp1',
kAudioFormatMPEGLayer2 = '.mp2', kAudioFormatMPEGLayer2 ='。mp2',
kAudioFormatMPEGLayer3 = '.mp3', kAudioFormatMPEGLayer3 ='。mp3',
kAudioFormatTimeCode = 'time', kAudioFormatTimeCode ='时间',
kAudioFormatMIDIStream = 'midi', kAudioFormatMIDIStream ='midi',
kAudioFormatParameterValueStream = 'apvs', kAudioFormatParameterValueStream ='apvs',
kAudioFormatAppleLossless = 'alac' kAudioFormatAppleLossless ='alac'
kAudioFormatMPEG4AAC_HE = 'aach', kAudioFormatMPEG4AAC_HE ='aach',
kAudioFormatMPEG4AAC_LD = 'aacl', kAudioFormatMPEG4AAC_LD ='aacl',
kAudioFormatMPEG4AAC_ELD = 'aace', kAudioFormatMPEG4AAC_ELD ='aace',
kAudioFormatMPEG4AAC_HE_V2 = 'aacp', kAudioFormatMPEG4AAC_HE_V2 ='aacp',
kAudioFormatMPEG4AAC_Spatial = 'aacs', kAudioFormatMPEG4AAC_Spatial ='aacs',
kAudioFormatAMR = 'samr', kAudioFormatAMR ='samr',
kAudioFormatAudible = 'AUDB', kAudioFormatAudible ='AUDB',
kAudioFormatiLBC = 'ilbc', kAudioFormatiLBC ='ilbc',
kAudioFormatDVIIntelIMA = 0x6D730011, kAudioFormatDVIIntelIMA = 0x6D730011,
kAudioFormatMicrosoftGSM = 0x6D730031, kAudioFormatMicrosoftGSM = 0x6D730031,
kAudioFormatAES3 = 'aes3' kAudioFormatAES3 ='aes3'
However, I dont think we can use all the formats mentioned (eg mp3). 但是,我不认为我们可以使用所有提到的格式(例如mp3)。
Can anyone help me out with the formats that are supported for recording sound using AVAudioRecorder ? 任何人都可以帮助我使用AVAudioRecorder录制声音支持的格式吗?
Thanks. 谢谢。
As per apple docs Apple Core Audio Format Specification 1.0 it should now support mp3 although I haven't tested it, this is the current enumeration they support: 根据Apple docs Apple Core Audio Format Specification 1.0,它现在应该支持mp3,虽然我还没有测试过,这是他们支持的当前枚举:
enum {
kAudioFormatLinearPCM = 'lpcm',
kAudioFormatAppleIMA4 = 'ima4',
kAudioFormatMPEG4AAC = 'aac ',
kAudioFormatMACE3 = 'MAC3',
kAudioFormatMACE6 = 'MAC6',
kAudioFormatULaw = 'ulaw',
kAudioFormatALaw = 'alaw',
kAudioFormatMPEGLayer1 = '.mp1',
kAudioFormatMPEGLayer2 = '.mp2',
kAudioFormatMPEGLayer3 = '.mp3',
kAudioFormatAppleLossless = 'alac'
};
List above just 列出上面的内容
currently defined values for the mFormatID field
当前为mFormatID字段定义的值
not supported for recording. 不支持录制。
There are tested with AVAudioRecorder formats (with sample rates): 有AVAudioRecorder格式测试(带采样率):
"MPEG4AAC (8000, 11025, 22050, 32000, 44100, 48000)",
"AppleLossless (8000, 11025, 22050, 32000, 44100, 48000)",
"MPEG4AAC_HE (32000, 44100, 48000)",
"MPEG4AAC_LD (22050, 32000, 44100, 48000)",
"MPEG4AAC_ELD (22050, 32000, 44100, 48000)",
"MPEG4AAC_ELD_SBR (22050, 32000, 44100, 48000)",
"MPEG4AAC_ELD_V2 (22050, 32000, 44100, 48000)"
Example: 例:
[[AVAudioRecorder alloc] initWithURL:outputFileURL
settings:@{
AVFormatIDKey : @(kAudioFormatMPEG4AAC),
AVSampleRateKey : @(44100.0),
AVNumberOfChannelsKey : @(2)
}
error:&error];
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