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copied!<p><code>Step 1 :</code> Add <code>AVFoundation.Framework</code> and <code>CoreMedia.Framework</code> in your Project</p> <p><code>Step 2 :</code> <code>#import <AVFoundation/AVFoundation.h></code> in your <code>.h</code> file</p> <p><code>Step 3 :</code> <code>Write following method in your .m file</code> </p> <p><code>Step 4 :</code> <code>Call this function from ViewDidAppear to create Merged Audio file.</code></p> <pre><code>// Get Asset Detail - (AVAsset *)getAvAssetForFile:(NSString *)fileName andType:(NSString *)fileType { NSString *URLPath = [[NSBundle mainBundle] pathForResource:fileName ofType:fileType]; NSURL *assetURL = [NSURL fileURLWithPath:URLPath]; AVAsset *asset = [AVAsset assetWithURL:assetURL]; return asset; } - (void)mergeAudioFiles { // `An Array with List of Audio Clips to be Merged, they could be of different type also` NSMutableArray *listOfAudio = [[NSMutableArray alloc] initWithCapacity:0]; // `Create AVAsset Object from your audio files and add to array` [listOfAudio addObject:[self getAvAssetForFile:@"audioFile1" andType:@"caf"]]; [listOfAudio addObject:[self getAvAssetForFile:@"audioFile2" andType:@"caf"]]; [listOfAudio addObject:[self getAvAssetForFile:@"audioFile3" andType:@"aiff"]]; AVMutableComposition *composition = [AVMutableComposition composition]; CMTime current = kCMTimeZero; NSError *compositionError = nil; for(AVAsset *asset in listOfAudio) { BOOL result = [composition insertTimeRange:CMTimeRangeMake(kCMTimeZero, [asset duration]) ofAsset:asset atTime:current error:&compositionError]; if(!result) { if(compositionError) { // manage the composition error case NSLog(@"Error in Merging : %@",[compositionError debugDescription]); } } else { current = CMTimeAdd(current, [asset duration]); } } AVAssetExportSession *exporter = [[AVAssetExportSession alloc] initWithAsset: composition presetName: AVAssetExportPresetAppleM4A]; exporter.outputFileType = @"com.apple.m4a-audio"; // Set Output FileName NSString *fileName = @"myAudioTrack"; NSString *exportFile = [DOC_DIR_PATH stringByAppendingFormat: @"/%@.m4a", fileName]; // set up export NSURL *exportURL = [NSURL fileURLWithPath:exportFile]; exporter.outputURL = exportURL; // do the export [exporter exportAsynchronouslyWithCompletionHandler:^{ int exportStatus = exporter.status; switch (exportStatus) { case AVAssetExportSessionStatusFailed: NSLog (@"AVAssetExportSessionStatusFailed: %@", exporter.debugDescription); break; case AVAssetExportSessionStatusCompleted: NSLog (@"AVAssetExportSessionStatusCompleted"); break; case AVAssetExportSessionStatusUnknown: NSLog (@"AVAssetExportSessionStatusUnknown"); break; case AVAssetExportSessionStatusExporting: NSLog (@"AVAssetExportSessionStatusExporting"); break; case AVAssetExportSessionStatusCancelled: NSLog (@"AVAssetExportSessionStatusCancelled"); break; case AVAssetExportSessionStatusWaiting: NSLog (@"AVAssetExportSessionStatusWaiting"); break; default: NSLog (@"didn't get export status"); break; } }]; } </code></pre>

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