IOS拼接MP3，歌曲文件合成。

其实就是把MP3文件转成NSData，然后再进行拼合。

[cpp] view plaincopy

1. - (void)viewDidLoad  
2. {  
3.     [super viewDidLoad];  
4.     // Do any additional setup after loading the view, typically from a nib.  
5.       
6.     //音频文件路径  
7.     NSString *mp3Path1 = [[NSBundle mainBundle] pathForResource:@"1" ofType:@"mp3"];  
8.     NSString *mp3Path2 = [[NSBundle mainBundle] pathForResource:@"2" ofType:@"mp3"];  
9.     NSString *mp3Path3 = [[NSBundle mainBundle] pathForResource:@"3" ofType:@"mp3"];  
10.     //音频数据  
11.     NSData *sound1Data = [[NSData alloc] initWithContentsOfFile: mp3Path1];  
12.     NSData *sound2Data = [[NSData alloc] initWithContentsOfFile: mp3Path2];  
13.     NSData *sound3Data = [[NSData alloc] initWithContentsOfFile: mp3Path3];  
14.       
15.     //合并音频  
16.     NSMutableData *sounds = [NSMutableData alloc];  
17.     [sounds appendData:sound1Data];  
18.     [sounds appendData:sound2Data];  
19.     [sounds appendData:sound3Data];  
20.     //保存音频  
21.       
22.     NSLog(@"data length:%d", [sounds length]);  
23.       
24.     [sounds writeToFile:[self filePathWithName:@"tmp.mp3"] atomically:YES];  
25.       
26.       
27.     player = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:[self filePathWithName:@"tmp.mp3"]] error:nil];  
28.     player.delegate = self;  
29.     [player prepareToPlay];  
30. }  
31.   
32. - (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag  
33. {  
34.     MPMusicPlayerController *ipodPlayer = [MPMusicPlayerController iPodMusicPlayer];  
35.     if ([ipodPlayer playbackState] == MPMusicPlaybackStateInterrupted) {  
36.         [ipodPlayer play];  
37.     }  
38. }  
39.   
40. - (void)didReceiveMemoryWarning  
41. {  
42.     [super didReceiveMemoryWarning];  
43.     // Dispose of any resources that can be recreated.  
44. }  
45.   
46. - (NSString *)filePathWithName:(NSString *)filename  
47. {  
48.     NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);  
49.     NSString *documentsDirectory = [paths objectAtIndex:0];  
50.     return [documentsDirectory stringByAppendingPathComponent:filename];  
51. }  
52.   
53.   
54. - (IBAction)buttonClick:(id)sender {  
55.       
56.       
57.     [player play];  
58.       
59. }