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    <p>I can achieve the combining of two files by recording the audio in .wav extension and the code is as follows,</p> <pre><code>NSURL *originalFileName = [NSURL alloc]; NSURL *RecordingPath =[NSURL fileURLWithPath:[appDelegate.RecordingPath stringByAppendingPathComponent: [NSString stringWithFormat:@"RecordingFile.wav"]]]; NSLog(@"LocalRecoding Path :%@",RecordingPath); originalFileName=RecordingPath; NSURL *temporaryFileName = [NSURL alloc]; temporaryFileName = [NSURL fileURLWithPath:[appDelegate.RecordingPath stringByAppendingPathComponent: [NSString stringWithFormat: @"tempRecordingFile.%@", @"wav"]]]; long totalAudioLen = 0; long totalDataLen = 0; long longSampleRate = 11025.0; int channels = 2; long byteRate = 16 * 11025.0 * channels/8; NSData * wav1Data = [NSData dataWithContentsOfFile:[originalFileName path]]; NSData * wav2Data = [NSData dataWithContentsOfFile:[temporaryFileName path]]; if([wav1Data length]&gt;0 &amp;&amp; [wav2Data length] &gt;0) { int wav1DataSize = [wav1Data length] - 44; NSLog(@"WAV I:%d",wav1DataSize); int wav2DataSize = [wav2Data length] - 44; NSLog(@"WAV II:%d",wav2DataSize); NSData *Wave1= [NSMutableData dataWithData:[wav1Data subdataWithRange:NSMakeRange(44, wav1DataSize)]]; NSData *Wave2 =[NSMutableData dataWithData:[wav2Data subdataWithRange:NSMakeRange(44, wav2DataSize)]]; NSLog(@"WAV 1:%d",[Wave1 length]); NSLog(@"WAV 2:%d",[Wave2 length]); totalAudioLen=[Wave1 length]+[Wave2 length]; totalDataLen = totalAudioLen + 44; Byte *header = (Byte*)malloc(44); header[0] = 'R'; // RIFF/WAVE header header[1] = 'I'; header[2] = 'F'; header[3] = 'F'; header[4] = (Byte) (totalDataLen &amp; 0xff); header[5] = (Byte) ((totalDataLen &gt;&gt; 8) &amp; 0xff); header[6] = (Byte) ((totalDataLen &gt;&gt; 16) &amp; 0xff); header[7] = (Byte) ((totalDataLen &gt;&gt; 24) &amp; 0xff); header[8] = 'W'; header[9] = 'A'; header[10] = 'V'; header[11] = 'E'; header[12] = 'f'; // 'fmt ' chunk header[13] = 'm'; header[14] = 't'; header[15] = ' '; header[16] = 16; // 4 bytes: size of 'fmt ' chunk header[17] = 0; header[18] = 0; header[19] = 0; header[20] = 1; // format = 1 header[21] = 0; header[22] = (Byte) channels; header[23] = 0; header[24] = (Byte) (longSampleRate &amp; 0xff); header[25] = (Byte) ((longSampleRate &gt;&gt; 8) &amp; 0xff); header[26] = (Byte) ((longSampleRate &gt;&gt; 16) &amp; 0xff); header[27] = (Byte) ((longSampleRate &gt;&gt; 24) &amp; 0xff); header[28] = (Byte) (byteRate &amp; 0xff); header[29] = (Byte) ((byteRate &gt;&gt; 8) &amp; 0xff); header[30] = (Byte) ((byteRate &gt;&gt; 16) &amp; 0xff); header[31] = (Byte) ((byteRate &gt;&gt; 24) &amp; 0xff); header[32] = (Byte) (2 * 8 / 8); // block align header[33] = 0; header[34] = 16; // bits per sample header[35] = 0; header[36] = 'd'; header[37] = 'a'; header[38] = 't'; header[39] = 'a'; header[40] = (Byte) (totalAudioLen &amp; 0xff); header[41] = (Byte) ((totalAudioLen &gt;&gt; 8) &amp; 0xff); header[42] = (Byte) ((totalAudioLen &gt;&gt; 16) &amp; 0xff); header[43] = (Byte) ((totalAudioLen &gt;&gt; 24) &amp; 0xff); NSData *headerData = [NSData dataWithBytes:header length:44]; //Merge the sound data of the original file with the temp file and create a new sound file with the //update header. NSMutableData * soundFileData = [NSMutableData alloc]; [soundFileData appendData:[headerData subdataWithRange:NSMakeRange(0, 44)]]; [soundFileData appendData:Wave1]; [soundFileData appendData:Wave2]; //delete the original file NSFileManager * fm = [NSFileManager defaultManager]; [fm removeItemAtPath:[originalFileName path] error:nil]; //create a new file with merged audio with the original file name. NSURL *mergedFilePath = [NSURL alloc]; mergedFilePath = [NSURL fileURLWithPath:[appDelegate.RecordingPath stringByAppendingPathComponent: [NSString stringWithFormat:[originalFileName lastPathComponent]]]]; [[NSFileManager defaultManager] createFileAtPath:[mergedFilePath path] contents:soundFileData attributes:nil]; NSLog(@"COMBINED FILE PATH :%@",mergedFilePath); } </code></pre>
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