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import AVFoundation
import AppKit
class CapturaCaptureSession: AVCaptureSession, AVCaptureFileOutputRecordingDelegate,
AVCaptureVideoDataOutputSampleBufferDelegate
{
let videoOutput = AVCaptureVideoDataOutput()
let movieFileOutput = AVCaptureMovieFileOutput()
var receivedFrames = false
init(_ screen: NSScreen, box: NSRect) {
super.init()
let displayId =
screen.deviceDescription[NSDeviceDescriptionKey("NSScreenNumber")] as! CGDirectDisplayID
let screenInput = AVCaptureScreenInput(displayID: displayId)
var croppingBox = NSOffsetRect(box, -screen.frame.origin.x, -screen.frame.origin.y)
if croppingBox.width.truncatingRemainder(dividingBy: 2) != 0 {
croppingBox.size.width -= 1
}
screenInput?.cropRect = croppingBox.insetBy(dx: 1, dy: 1)
if self.canAddInput(screenInput!) {
self.addInput(screenInput!)
}
videoOutput.setSampleBufferDelegate(
self, queue: Dispatch.DispatchQueue(label: "sample buffer delegate", attributes: []))
if self.canAddOutput(videoOutput) {
self.addOutput(videoOutput)
}
if self.canAddOutput(movieFileOutput) {
self.addOutput(movieFileOutput)
}
}
func startRecording() {
receivedFrames = false
self.startRunning()
DispatchQueue.main.asyncAfter(deadline: .now() + 1) {
if !self.receivedFrames {
NotificationCenter.default.post(name: .failedToStart, object: nil, userInfo: nil)
}
}
}
func startRecording(to url: URL) {
self.startRecording()
movieFileOutput.startRecording(to: url, recordingDelegate: self)
}
// MARK: - AVCaptureVideoDataOutputSampleBufferDelegate Implementation
func captureOutput(
_ output: AVCaptureOutput, didOutput sampleBuffer: CMSampleBuffer,
from connection: AVCaptureConnection
) {
receivedFrames = true
guard let imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer) else { return }
NotificationCenter.default.post(
name: .receivedFrame, object: nil, userInfo: ["frame": imageBuffer])
}
// MARK: - AVCaptureFileOutputRecordingDelegate Implementation
func fileOutput(
_ output: AVCaptureFileOutput, didFinishRecordingTo outputFileURL: URL,
from connections: [AVCaptureConnection], error: Error?
) {}
}
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