我试过下面的代码。
-(void)mediaItemToData : (MPMediaItem * ) curItem
{
NSURL *url = [curItem valueForProperty: MPMediaItemPropertyAssetURL];
AVURLAsset *songAsset = [AVURLAsset URLAssetWithURL: url options:nil];
AVAssetExportSession *exporter = [[AVAssetExportSession alloc] initWithAsset: songAsset
presetName:AVAssetExportPresetPassthrough];
exporter.outputFileType = @"public.mpeg-4";
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString * myDocumentsDirectory = ([paths count] > 0) ? [paths objectAtIndex:0] : nil;
NSString *exportFile = [myDocumentsDirectory stringByAppendingPathComponent:
@"exported.mp4"];
NSURL *exportURL = [NSURL fileURLWithPath:exportFile];
exporter.outputURL = exportURL;
// do the export
// (completion handler block omitted)
[exporter exportAsynchronouslyWithCompletionHandler:
^{
NSData *data = [NSData dataWithContentsOfFile: [myDocumentsDirectory
stringByAppendingPathComponent: @"exported.mp4"]];
DLog(@"Data %@",data);
}];
}
此代码在 iOS 5 中运行良好,但现在在 iOS 6 中运行。
iOS6 的任何更改AVAssetExportPresetPassthrough
. ???
我找到了iOS 6的解决方案。请参阅下面的修改代码
-(void)mediaItemToData : (MPMediaItem * ) curItem
{
NSURL *url = [curItem valueForProperty: MPMediaItemPropertyAssetURL];
AVURLAsset *songAsset = [AVURLAsset URLAssetWithURL: url options:nil];
AVAssetExportSession *exporter = [[AVAssetExportSession alloc] initWithAsset: songAsset
presetName:AVAssetExportPresetAppleM4A];
exporter.outputFileType = @"com.apple.m4a-audio";
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString * myDocumentsDirectory = ([paths count] > 0) ? [paths objectAtIndex:0] : nil;
[[NSDate date] timeIntervalSince1970];
NSTimeInterval seconds = [[NSDate date] timeIntervalSince1970];
NSString *intervalSeconds = [NSString stringWithFormat:@"%0.0f",seconds];
NSString * fileName = [NSString stringWithFormat:@"%@.m4a",intervalSeconds];
NSString *exportFile = [myDocumentsDirectory stringByAppendingPathComponent:fileName];
NSURL *exportURL = [NSURL fileURLWithPath:exportFile];
exporter.outputURL = exportURL;
// do the export
// (completion handler block omitted)
[exporter exportAsynchronouslyWithCompletionHandler:
^{
int exportStatus = exporter.status;
switch (exportStatus)
{
case AVAssetExportSessionStatusFailed:
{
NSError *exportError = exporter.error;
NSLog (@"AVAssetExportSessionStatusFailed: %@", exportError);
break;
}
case AVAssetExportSessionStatusCompleted:
{
NSLog (@"AVAssetExportSessionStatusCompleted");
NSData *data = [NSData dataWithContentsOfFile: [myDocumentsDirectory
stringByAppendingPathComponent:fileName]];
//DLog(@"Data %@",data);
data = nil;
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;
}
}
}];
}
See 这个链接 http://developer.apple.com/library/ios/#documentation/AVFoundation/Reference/AVFoundation_Constants/Reference/reference.html了解更多信息。
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