I'm trying to use the following code to save a snippet of audio from a url stream (e.g., a radio station broadcast):
float vocalStartMarker = 0.0;
float vocalEndMarker = 20.0;
NSURL *audioFileInput = [[NSURL alloc] initWithString: @"http://streamedaudio.mp3"];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsPath = [paths objectAtIndex:0]; //Get the docs directory
NSString *filePath = [documentsPath stringByAppendingPathComponent:@"TestName.m4a"]; //Add the file name
//[audioFileInput writeToFile:filePath atomically:YES]; //Write the file
NSURL *audioFileOutput = [[NSURL alloc] initWithString: filePath];
NSLog(@"%@", audioFileOutput);
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)
{
NSLog(@"%@", exportSession.error);
return;
}
}];
I get the following error:
2015-12-26 14:17:11.523 SaveURL[4135:24621] Error Domain=AVFoundationErrorDomain Code=-11838 "Operation Stopped" UserInfo={NSLocalizedDescription=Operation Stopped, NSLocalizedFailureReason=The operation is not supported for this media.}
Is this because i'm trying to convert an MP3 to M4A?
Thanks in advance for your help with this.
