IOS - Detect Movie Aspect Ratio

Question

I need to detect the aspect ratio of a movie (whether 4:3 or 16:9) in order to change the size of the UIImageView within which I display a movieController. I'm using the code below. However, i'm getting 'nan' returned from an NSLog call that displays the value of the variable 'ratio'. So, it seems 'ratio' is not in the format I need it to be. I can't work out what i'm doing wrong here.
CGSize size = moviePlayerController.naturalSize;
float width = size.width;
float height = size.height;
float ratio = width / height;
if (ratio == 1.33) {
//do stuff here if aspect is 4:3
} else {
//else it's 16:9 and do different stuff
}

Answer 1

Ok, I figured it out...
First, you need to register for the MPMovieNaturalSizeAvailableNotification. I put this in viewDidLoad.
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(movieNaturalSizeAvailable:)
name:MPMovieNaturalSizeAvailableNotification
object:moviePlayerController];
Then, you create the @selector function:
- (void) movieNaturalSizeAvailable:(NSNotification *)movieNSNotification {
NSLog(@"MovieNaturalSizeAvaiable");
NSLog(@"Movie width is %f and movie height is %f", moviePlayerController.naturalSize.width, moviePlayerController.naturalSize.height);
//calculate the aspect ratio
float width = moviePlayerController.naturalSize.width;
float height = moviePlayerController.naturalSize.height;
float ratio = width / height;
NSLog(@"ratio is %f", ratio);
//if ratio < 1.4 then it must be 4:3 aspect ratio, else it is 16:9
if (ratio < 1.4) {
moviePlayerController.view.frame = CGRectMake(66, 29, 347, 260);
imageView.frame = CGRectMake(66, 29, 347, 260);
} else {
moviePlayerController.view.frame = imageFrame;
imageView.frame = CGRectMake(9, 29, 462, 260);
moviePlayerController = [movieNSNotification object];
[[NSNotificationCenter defaultCenter] removeObserver:self
name:MPMovieNaturalSizeAvailableNotification
object:moviePlayerController];
Message was edited by: Grant Abt1