ios 錄製音頻

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//匯入上面2個架構#import <AVFoundation/AVFoundation.h>#import <CoreFoundation/CoreFoundation.h>//聲明下面4個屬性@property (nonatomic ,assign)BOOL recording;   //判斷是否可以錄製@property (nonatomic ,strong)NSString *fileName; //音頻檔案儲存體時的檔案名稱@property (nonatomic ,strong)AVAudioRecorder *recorder;  //聲明一個錄製器@property (nonatomic ,strong)AVAudioPlayer *player;   //聲明一個音頻播放器- (void)startRecording{if (self.recording) {        return;    }    self.recording =YES;//    設定錄音格式  AVFormatIDKey==kAudioFormatLinearPCM//    設定錄音採樣率(Hz) 如：AVSampleRateKey==8000/44100/96000（影響音訊品質）//    錄音通道數  1 或 2   AVNumberOfChannelsKey//    線性採樣位元  8、16、24、32   AVLinearPCMBitDepthKey//     錄音的品質   AVEncoderAudioQualityKey == AVAudioQualityHigh//    AVLinearPCMIsBigEndianKey 大端還是小端,是記憶體的組織方式//    AVLinearPCMIsFloatKey  採樣訊號是整數還是浮點數    NSDictionary *audioSettingDict =[NSDictionary dictionaryWithObjectsAndKeys:                            [NSNumber numberWithFloat:8000],AVSampleRateKey,                            [NSNumber numberWithInt:kAudioFormatLinearPCM],                                AVFormatIDKey,                            [NSNumber numberWithInt:1],AVNumberOfChannelsKey,                            [NSNumber numberWithInt:16],AVLinearPCMBitDepthKey,                            [NSNumber numberWithBool:NO],AVLinearPCMIsBigEndianKey,                            [NSNumber numberWithBool:NO],AVLinearPCMIsFloatKey,                            [NSNumber numberWithInt:AVAudioQualityHigh],AVEncoderAudioQualityKey,                            nil];    NSError *error =nil;    AVAudioSession * audioSession = [AVAudioSession sharedInstance];    [audioSession setCategory:AVAudioSessionCategoryPlayAndRecord error:&error];//設定音頻類別，這裡表示當應用啟動，停掉後台其他音頻        [audioSession setActive:YES error:&error];//設定當前應用音頻活躍性         NSDate *now =[NSDate date];    //執行個體化一個NSDateFormatter對象    NSDateFormatter *dateFormater = [[NSDateFormatter alloc] init];    //設定時間格式,這裡可以設定成自己需要的格式    [dateFormater setDateFormat:@"yyyy-MM-dd HH-mm-ss"];        NSString *fileName = [NSString stringWithFormat:@"rec_%@.wav",[dateFormater stringFromDate:now]];    self.fileName =fileName;    NSString *filePath =[NSString documentPathWith:fileName];    NSURL *fileUrl =[NSURL URLWithString:filePath];    //   初始化錄製的類    self.recorder =[[AVAudioRecorder alloc]initWithURL:fileUrl settings:audioSettingDict error:&error];        [self.recorder prepareToRecord];    [self.recorder peakPowerForChannel:0];    [self.recorder setMeteringEnabled:YES];    [self.recorder record];}