NSData From Asset Representation

NSDataFromAssetRepresentation

- (NSData *) getDataFromAssetRepresentation: (ALAssetRepresentation *) representation
{
    if(!representation)
    {
        NSLog(@"asset representation is NIL!");
        return nil;
    }
    
    uint8_t *buffer = malloc(representation.size);
    NSError *error = nil;
    NSUInteger bufferLength = [representation getBytes:buffer fromOffset: 0 length:representation.size error: &error];
    
    if(error)
    {
        NSLog(@"asset representation getBytes error: %@",error.localizedDescription);
        if(buffer)
            free(buffer);
        return nil;
    }
    else
    {
        NSData *assetData = [NSData dataWithBytes: buffer length: bufferLength];
        if(buffer)
            free(buffer);
        return assetData;
    }
}