ALAssetから画像データへの変換

ALAsset2.m

// Getting Raw Data from ALAsset.
// ALAsset* asset = ...
ALAssetRepresentation *rep = [asset defaultRepresentation];
Byte *buffer = (Byte*)malloc( (size_t)rep.size );
NSUInteger buffered = [rep getBytes:buffer fromOffset:0.0 length:(NSUInteger)rep.size error:nil];
NSData *data = [NSData dataWithBytesNoCopy:buffer length:buffered freeWhenDone:YES];


// UIImage from ALAsset.
// ALAsset* asset = ...
ALAssetRepresentation   *rep        = [asset defaultRepresentation];
UIImage                 *imageOrg   = [UIImage imageWithCGImage:rep.fullScreenImage
                                                          scale:rep.scale
                                                    orientation:0];