How to use AVCaptureConnnections? - iphone

Question

i am new to AVFoundation and i am trying to implement a video camera with AVFoundation here is my basic setup. Basically, when you click a button it will call the showCamera method. In here i create the session and then add an audio input and video input then add the video output.
Where in here do i add the AVCaptureConnection and how do i do it? Is there some tutorial that shows how to use the connections? Any help is appreciated.
- (IBAction) showCamera
{
//Add the camview to the current view ontop of controller
[[[[[UIApplication sharedApplication] delegate] self] window] addSubview:camView];
session = [[AVCaptureSession alloc] init];
//Set preset on session to make recording scale high
if ([session canSetSessionPreset:AVCaptureSessionPresetHigh]) {
session.sessionPreset = AVCaptureSessionPresetHigh;
}
// Add inputs and outputs.
NSArray *devices = [AVCaptureDevice devices];
//Print out all devices on phone
for (AVCaptureDevice *device in devices)
{
if ([device hasMediaType:AVMediaTypeVideo])
{
if ([device position] == AVCaptureDevicePositionBack)
{
//Add Rear Video input to session
[self addRearCameraInputToSession:session withDevice:device];
}
}
else if ([device hasMediaType:AVMediaTypeAudio])
{
//Add Microphone input to session
[self addMicrophoneInputToSession:session withDevice:device];
}
else
{
//Show error that your camera does not have a phone
}
}
//Add movie output
[self addMovieOutputToSession:session];
//Construct preview layer
[self constructPreviewLayerWithSession:session onView:camView];
}

Answer 1

You don't add AVCaptureConnections manually. When you have both an input and an output added to the AVCaptureSession object, the connections are automatically created for you. Quoth the documentation:
When an input or an output is added to a session, the session greedily forms connections between all the compatible capture inputs’ ports and capture outputs.
Unless you need to disable one of the automatically-created connections, or change the videoMirrored or videoOrientation properties, you shouldn't have to worry about them at all.

Answer 2

Take a look at following URLs...
Documentation from Apple:
An Article:
Video Recording using AVFoundation Framework iPhone?
I think, it will help you....