Get iPhone's camera resolution?

Question

Is there any way to get the resolution of the iPhone's camera? Apparently the 3G has 1200x1600, and 3GS has 1500x2000, but how do I obtain these values from inside my code (without taking the picture). I need them to make some affine transform to the camera preview.

I could detect if it's 3G or 3GS to hardcode these values, but it's just the last resort.

Answer 1

I think your "last resort" is a good solution.

What's wrong with detecting the model? The hardware isn't going to change for either of those models.. The only concern you might have is if the 3GSX-R or something comes out with a 16mpx camera. At which point you'd probably have to update your app anyways and could just add another value to the list.

I vote for model detection.

Answer 2

The post is old, but it is almost first in google, and it has got no valid answer, so here's one more option:

Solution for iOS from 4.x to 7.x

It's all in terms of AV Foundation framework

After AVCaptureSession is configured and started you can find video dimensions inside [[[session.inputs.lastObject] ports].lastObject formatDescription] variable

Here's approximate code:

AVCaptureSession* session = ...;
AVCaptureDevice *videoCaptureDevice = ...;
AVCaptureDeviceInput *videoInput = ...;

[session beginConfiguration];
if ([session canAddInput:videoInput]) {[session addInput:videoInput];}
[session commitConfiguration];
[session startRunning];

//this is the clue
AVCaptureInputPort *port = videoInput.ports.lastObject;
if ([port mediaType] == AVMediaTypeVideo)
{
    videoDimensions = CMVideoFormatDescriptionGetDimensions([port formatDescription]);
}

Solution for iOS8

Apple did change everything again: now you must subscribe for AVCaptureInputPortFormatDescriptionDidChangeNotification

Here is the sample:

-(void)initSession
{
    AVCaptureSession* session = ...;
    AVCaptureDevice *videoCaptureDevice = ...;
    AVCaptureDeviceInput *videoInput = ...;

    [session beginConfiguration];
    if ([session canAddInput:videoInput]) {[session addInput:videoInput];}
    [session commitConfiguration];
    [session startRunning];

    [[NSNotificationCenter defaultCenter] addObserver:self
            selector:@selector(avCaptureInputPortFormatDescriptionDidChangeNotification:)
            name:@"AVCaptureInputPortFormatDescriptionDidChangeNotification"
            object:nil];
}

-(void)avCaptureInputPortFormatDescriptionDidChangeNotification:(NSNotification *)notification
{
    AVCaptureInputPort *port = [videoInput.ports objectAtIndex:0];
    CMFormatDescriptionRef formatDescription = port.formatDescription;
    if (formatDescription) {
        videoDimensions = CMVideoFormatDescriptionGetDimensions(formatDescription);
    }

}