iOS Audio Trimming

Solution 1:

Here's the code that I've used to trim audio from a pre-existing file. You'll need to change the M4A related constants if you've saved or are saving to another format.

- (BOOL)trimAudio
{
    float vocalStartMarker = <starting time>;
    float vocalEndMarker = <ending time>;

    NSURL *audioFileInput = <your pre-existing file>;
    NSURL *audioFileOutput = <the file you want to create>;

    if (!audioFileInput || !audioFileOutput)
    {
        return NO;
    }

    [[NSFileManager defaultManager] removeItemAtURL:audioFileOutput error:NULL];
    AVAsset *asset = [AVAsset assetWithURL:audioFileInput];

    AVAssetExportSession *exportSession = [AVAssetExportSession exportSessionWithAsset:asset
                                                                            presetName:AVAssetExportPresetAppleM4A];

    if (exportSession == nil)
    {        
        return NO;
    }

    CMTime startTime = CMTimeMake((int)(floor(vocalStartMarker * 100)), 100);
    CMTime stopTime = CMTimeMake((int)(ceil(vocalEndMarker * 100)), 100);
    CMTimeRange exportTimeRange = CMTimeRangeFromTimeToTime(startTime, stopTime);

    exportSession.outputURL = audioFileOutput;
    exportSession.outputFileType = AVFileTypeAppleM4A;
    exportSession.timeRange = exportTimeRange;

    [exportSession exportAsynchronouslyWithCompletionHandler:^
     {
         if (AVAssetExportSessionStatusCompleted == exportSession.status)
         {
             // It worked!
         } 
         else if (AVAssetExportSessionStatusFailed == exportSession.status)
         {
             // It failed...
         }
     }];

    return YES;
}

There's also Technical Q&A 1730, which gives a slightly more detailed approach.

Solution 2:

import following two libraries in .m

#import "BJRangeSliderWithProgress.h"
#import  < AVFoundation/AVFoundation.h >

and after that paste following code you will be able to trim an audio file with the help of two thumbs.

- (void) viewDidLoad
{
      [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.

       mySlider = [[BJRangeSliderWithProgress alloc] initWithFrame:CGRectMake(20, 100, 300, 50)];

      [mySlider setDisplayMode:BJRSWPAudioSetTrimMode];

      [mySlider addTarget:self action:@selector(valueChanged) forControlEvents:UIControlEventValueChanged];

      [mySlider setMinValue:0.0];

      NSString *strInputFilePath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"saewill.mp3"];

      NSURL *audioFileInput = [NSURL fileURLWithPath:strInputFilePath];

      audioPlayer=[[AVAudioPlayer alloc]initWithContentsOfURL:audioFileInput error:nil];

      [mySlider setMaxValue:audioPlayer.duration];

      [self.view addSubview:mySlider];
}

-(void)valueChanged {
      NSLog(@"%f %f", mySlider.leftValue, mySlider.rightValue);
}


-(IBAction)playTheSong
{
      // Path of your source audio file
      NSString *strInputFilePath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"saewill.mp3"];
      NSURL *audioFileInput = [NSURL fileURLWithPath:strInputFilePath];

      // Path of your destination save audio file
      NSArray *paths = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES);
      NSString *libraryCachesDirectory = [paths objectAtIndex:0];
      //libraryCachesDirectory = [libraryCachesDirectory stringByAppendingPathComponent:@"Caches"];

      NSString *strOutputFilePath = [libraryCachesDirectory stringByAppendingPathComponent:@"output.mov"];
      NSString *requiredOutputPath = [libraryCachesDirectory stringByAppendingPathComponent:@"output.m4a"];
      NSURL *audioFileOutput = [NSURL fileURLWithPath:requiredOutputPath];

      [[NSFileManager defaultManager] removeItemAtURL:audioFileOutput error:NULL];
      AVAsset *asset = [AVAsset assetWithURL:audioFileInput];

      AVAssetExportSession *exportSession = [AVAssetExportSession exportSessionWithAsset:asset
                                                                              presetName:AVAssetExportPresetAppleM4A];


      float startTrimTime = mySlider.leftValue;
      float endTrimTime = mySlider.rightValue;

      CMTime startTime = CMTimeMake((int)(floor(startTrimTime * 100)), 100);
      CMTime stopTime = CMTimeMake((int)(ceil(endTrimTime * 100)), 100);
      CMTimeRange exportTimeRange = CMTimeRangeFromTimeToTime(startTime, stopTime);

      exportSession.outputURL = audioFileOutput;
      exportSession.outputFileType = AVFileTypeAppleM4A;
      exportSession.timeRange = exportTimeRange;

      [exportSession exportAsynchronouslyWithCompletionHandler:^
       {
           if (AVAssetExportSessionStatusCompleted == exportSession.status)
           {
               NSLog(@"Success!");
               NSLog(@" OUtput path is \n %@", requiredOutputPath);
               NSFileManager * fm = [[NSFileManager alloc] init];
               [fm moveItemAtPath:strOutputFilePath toPath:requiredOutputPath error:nil];
               //[[NSFileManager defaultManager] removeItemAtURL:audioFileOutput error:NULL];

               NSURL *url=[NSURL fileURLWithPath:requiredOutputPath];
               NSError *error;
               audioPlayer=[[AVAudioPlayer alloc]initWithContentsOfURL:url error:&error];
               audioPlayer.numberOfLoops=0;
               [audioPlayer play];

           }
           else if (AVAssetExportSessionStatusFailed == exportSession.status)
           {
               NSLog(@"failed with error: %@", exportSession.error.localizedDescription);
           }
       }];

}

Solution 3:

Here is a sample code which trim audio file from starting & ending offset and save it back. Please check this iOS Audio Trimming.

// Path of your source audio file
NSString *strInputFilePath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"abc.mp3"];
NSURL *audioFileInput = [NSURL fileURLWithPath:strInputFilePath];

// Path of your destination save audio file
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES);
    NSString *libraryCachesDirectory = [paths objectAtIndex:0];
    libraryCachesDirectory = [libraryCachesDirectory stringByAppendingPathComponent:@"Caches"];

NSString *strOutputFilePath = [NSString stringWithFormat:@"%@%@",libraryCachesDirectory,@"/abc.mp4"];
NSURL *audioFileOutput = [NSURL fileURLWithPath:strOutputFilePath];

if (!audioFileInput || !audioFileOutput)
{
    return NO;
}

[[NSFileManager defaultManager] removeItemAtURL:audioFileOutput error:NULL];
AVAsset *asset = [AVAsset assetWithURL:audioFileInput];

AVAssetExportSession *exportSession = [AVAssetExportSession exportSessionWithAsset:asset presetName:AVAssetExportPresetAppleM4A];

if (exportSession == nil)
{
    return NO;
}
float startTrimTime = 0; 
float endTrimTime = 5;

CMTime startTime = CMTimeMake((int)(floor(startTrimTime * 100)), 100);
CMTime stopTime = CMTimeMake((int)(ceil(endTrimTime * 100)), 100);
CMTimeRange exportTimeRange = CMTimeRangeFromTimeToTime(startTime, stopTime);

exportSession.outputURL = audioFileOutput;
exportSession.outputFileType = AVFileTypeAppleM4A;
exportSession.timeRange = exportTimeRange;

[exportSession exportAsynchronouslyWithCompletionHandler:^
{
    if (AVAssetExportSessionStatusCompleted == exportSession.status)
    {
        NSLog(@"Success!");
    }
    else if (AVAssetExportSessionStatusFailed == exportSession.status)
    {
        NSLog(@"failed");
    }
}];