录音

在开始录音前，要把会话方式设置成AVAudioSessionCategoryPlayAndRecord

//设置为播放和录音状态，以便可以在录制完之后播放录音AVAudioSession *session = [AVAudioSession sharedInstance];NSError *setCategoryError = nil;[session setCategory:AVAudioSessionCategoryPlayAndRecord error:&setCategoryError];NSError *activationError = nil; [session setActive:YES error:&activationError];

创建AVAudioRecorder

给出录音存放的地址，录音的设置等

//录音存放位置
-(NSURL *) getRecordAudioPath{NSString *urlStr=[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];//#define kRecordAudioFile @"myRecord.caf"urlStr=[urlStr stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.caf",[[NSUUID UUID]UUIDString]]];NSLog(@"save file path at:%@",urlStr);NSURL *url=[NSURL fileURLWithPath:urlStr];return url; }

- (void) startRecord{if (recorder.isRecording) {return;}recorderUrl = [self getRecordAudioPath]; NSError *err =nil; NSMutableDictionary *dicM=[NSMutableDictionary dictionary]; // [dicM setValue :[NSNumber numberWithInt:kAudioFormatAppleIMA4] forKey:AVFormatIDKey]; //设置录音格式 [dicM setObject:@(kAudioFormatLinearPCM) forKey:AVFormatIDKey]; //设置录音采样率，8000是电话采样率，对于一般录音已经够了 [dicM setObject:@(8000) forKey:AVSampleRateKey]; //设置通道,这里采用单声道 [dicM setObject:@(1) forKey:AVNumberOfChannelsKey]; //每个采样点位数,分为8、16、24、32 [dicM setObject:@(8) forKey:AVLinearPCMBitDepthKey]; //是否使用浮点数采样 [dicM setObject:@(YES) forKey:AVLinearPCMIsFloatKey]; recorder = [[AVAudioRecorder alloc]initWithURL:recorderUrl settings:dicM error:&err]; recorder.delegate = self; 如果要监控声波则必须设置为YES recorder.meteringEnabled = YES; [recorder updateMeters]; if (err) { NSLog(@"创建录音机对象时发生错误，错误信息：%@",err.localizedDescription); recorder = nil; return ; } [recorder prepareToRecord]; [recorder record]; }

录制暂停

    //暂停录音，且可以继续录音[recorder pause];//[recorder record];

录制结束

    //录制结束，录音文件关闭,会执行代理方法audioRecorderDidFinishRecording/* stops recording. closes the file. */[recorder stop];

代理方法

pragma mark — AVAudioRecorderDelegate

-(void)audioRecorderDidFinishRecording:(AVAudioRecorder *)recorder successfully:(BOOL)flag
{
NSLog(@”录音完成!”);

}
-(void)audioRecorderEncodeErrorDidOccur:(AVAudioRecorder )recorder error:(NSError )error
{
NSLog(@”录音出错!”);

}

播放录音

创建AVAudioPlayer，AVAudioPlayer播放本地音频。

    NSError *err =nil;player = [[AVAudioPlayer alloc]initWithContentsOfURL:recorderUrl error:&err];player.delegate = self;//设置音乐播放次数 -1为一直循环 player.numberOfLoops = 0; //开启仪表计数功能 player.meteringEnabled = YES; [player updateMeters]; // player.enableRate = YES; //设置左右声道 left:-1,center:0.0,right =1; player.pan = 0.0; //设置音量，其值0.0～1.0 player.volume = 0.6; [player prepareToPlay]; [player play];

播放代理AVAudioPlayerDelegate

#pragma mark- AVAudioPlayerDelegate-(void)audioPlayerDecodeErrorDidOccur:(AVAudioPlayer *)player error:(NSError *)error
{NSLog(@"player 播放失败%@",error); } -(void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag { NSLog(@"player:%@ 播放完成%d",player,flag); // //根据实际情况播放完成可以将会话关闭，其他音频应用继续播放 // [[AVAudioSession sharedInstance]setActive:NO error:nil]; AudioServicesPlayAlertSound(kSystemSoundID_Vibrate); playBtn.selected = NO; }