录音回放

 1 - (IBAction) record:(id)sender
 2 {
 3     
 4     NSError *error = nil;
 5     BOOL b = [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryRecord error:&error];
 6     [[AVAudioSession sharedInstance] setDelegate:self];
 7     if(b){
 8         NSLog(@"set audio session category record victory%d",b);
 9     }else {
10         NSLog(@"error=================%@",error);
11     }
12     b = [[AVAudioSession sharedInstance] setActive:YES error:&error];
13     if(b){
14         NSLog(@"set active yes %d",b);
15     }else {
16         NSLog(@"error=================%@",error);
17     }
18     NSString *filePath = [NSTemporaryDirectory() stringByAppendingPathComponent:@"voice.caf"];
19     //NSLog(@"filePath=========================%@",filePath);
20     self.recordFileName = filePath;
21     NSURL *url = [NSURL fileURLWithPath:filePath];
22     
23     AVAudioRecorder *recorder = [[AVAudioRecorder alloc] initWithURL:url settings:recordSettings error:&error];
24     mRecorder = recorder;
25     [recorder setDelegate:self];
26     [recorder prepareToRecord];
27     
28     recorder.meteringEnabled = YES;
29     
30     BOOL audioHWAvailable = [[AVAudioSession sharedInstance] inputIsAvailable];
31     
32     // start recording
33     [recorder recordForDuration:(NSTimeInterval) 3];
34 }

播放相对简单：

 1 - (IBAction) play:(id)sender
 2 {
 3     NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
 4     AVAudioSession *audioSession = [AVAudioSession sharedInstance];
 5     [[AVAudioSession sharedInstance] setDelegate:self];
 6     NSError *error = nil;
 7     BOOL b = [audioSession setCategory:AVAudioSessionCategoryPlayback error:&error];
 8 //    if(b){
 9 //        NSLog(@"====================%d",b);
10 //    }else {
11 //        NSLog(@"error=================%@",error);
12 //    }
13     
14     b = [audioSession setActive:YES error:&error];
15 //    if(b){
16 //        NSLog(@"====================%d",b);
17 //    }else {
18 //        NSLog(@"error=================%@",error);
19 //    }
20     
21     NSURL *url = [NSURL fileURLWithPath:self.recordFileName];
22     //NSLog(@"url============================%@",url);
23     AVAudioPlayer *player = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error];
24     player.meteringEnabled = YES;
25     player.volume = 1.0;
26     player.delegate = self;
27     [player prepareToPlay];
28     [player play];
29     [pool release];
30 }