How to append two audio files?

Question

I want to append two audio files in iPhone. Please help me to do this.

Answer 1

I got the solution; Following is the sample code to do it.

AVMutableComposition* composition = [AVMutableComposition composition];
AVURLAsset* audioAsset1 = [[AVURLAsset alloc]initWithURL:[NSURL fileURLWithPath:filePath1] options:nil];
AVURLAsset* audioAsset2 = [[AVURLAsset alloc]initWithURL:[NSURL fileURLWithPath:filePath2] options:nil];

AVMutableCompositionTrack *audioTrack1 = [composition addMutableTrackWithMediaType:AVMediaTypeAudio 
                                                                      preferredTrackID:kCMPersistentTrackID_Invalid];

[audioTrack1 insertTimeRange:CMTimeRangeMake(kCMTimeZero, audioAsset1.duration)
                         ofTrack:[[audioAsset1 tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0]
                          atTime:kCMTimeZero
                           error:&error];
[audioTrack1 insertTimeRange:CMTimeRangeMake(kCMTimeZero, audioAsset2.duration) 
                         ofTrack:[[audioAsset2 tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0] 
                          atTime:audioAsset1.duration
                           error:&error];

Finally, we have to export it as a single file using AVAssetExportSession.

NOTE: It will work only for .m4a files