captureOutput:didOutputSampleBuffer:fromConnection: image buffer size is always 360x480 even on iPad
===

I am using the `captureOutput:didOutputSampleBuffer:fromConnection:` delegate method of `AVCaptureVideoDataOutput`. When testing it on the iPad the image buffer size is always 360x480 which seems really strange, I would think it would be the size of the iPad screen.

    - (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection { 
    	
        @autoreleasepool {
    	
            CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer); 
            /*Lock the image buffer*/
            CVPixelBufferLockBaseAddress(imageBuffer,0); 
            /*Get information about the image*/
            uint8_t *baseAddress = (uint8_t *)CVPixelBufferGetBaseAddress(imageBuffer); 
            size_t bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer); 
            size_t width = CVPixelBufferGetWidth(imageBuffer); 
            size_t height = CVPixelBufferGetHeight(imageBuffer);  
            
            /*Create a CGImageRef from the CVImageBufferRef*/
            CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); 
            CGContextRef newContext = CGBitmapContextCreate(baseAddress, width, height, 8, bytesPerRow, colorSpace, kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedFirst);
            CGImageRef newImage = CGBitmapContextCreateImage(newContext);
            
            NSLog(@"image size: h %zu, w %zu", height, width);
            
            /*We unlock the  image buffer*/
            CVPixelBufferUnlockBaseAddress(imageBuffer,0);
      
            CGRect zoom = CGRectMake(self.touchPoint.y, self.touchPoint.x, 120, 120);
            CGImageRef newImage2 = CGImageCreateWithImageInRect(newImage, zoom);
    	
            /*We release some components*/
            CGContextRelease(newContext); 
            CGColorSpaceRelease(colorSpace);
            
            UIImage* zoomedImage = [[UIImage alloc] initWithCGImage:newImage2 scale:1.0 orientation:UIImageOrientationUp];
            [self.zoomedView.layer performSelectorOnMainThread:@selector(setContents:) withObject:(__bridge id)zoomedImage.CGImage waitUntilDone:YES];
            
            CGImageRelease(newImage);
            CGImageRelease(newImage2);
    	
    	}
        
    }//end

Is there a reason why the image buffer would be so small, even on iPad?