Init

.editorconfig

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+root = true
+
+[*]
+indent_style = tab
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true

.gitattributes

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+* text=auto
+*.swift text eol=lf

.gitignore

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+/.build
+/Packages
+/*.xcodeproj

Package.swift

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+// swift-tools-version:3.1
+import PackageDescription
+
+let package = Package(
+	name: "IsCameraOn"
+)

Sources/IsCameraOn.swift

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+import Foundation
+import AVFoundation
+import CoreMediaIO
+
+private func getCameraProp() -> CMIOObjectID? {
+	var opa = CMIOObjectPropertyAddress(
+		mSelector: CMIOObjectPropertySelector(kCMIOHardwarePropertyDevices),
+		mScope: CMIOObjectPropertyScope(kCMIOObjectPropertyScopeGlobal),
+		mElement: CMIOObjectPropertyElement(kCMIOObjectPropertyElementMaster)
+	)
+
+	var (dataSize, dataUsed) = (UInt32(0), UInt32(0))
+	var result = CMIOObjectGetPropertyDataSize(CMIOObjectID(kCMIOObjectSystemObject), &opa, 0, nil, &dataSize)
+	var devices: UnsafeMutableRawPointer? = nil
+
+	repeat {
+		if devices != nil {
+			free(devices)
+			devices = nil
+		}
+		devices = malloc(Int(dataSize))
+		result = CMIOObjectGetPropertyData(CMIOObjectID(kCMIOObjectSystemObject), &opa, 0, nil, dataSize, &dataUsed, devices);
+	} while result == OSStatus(kCMIOHardwareBadPropertySizeError)
+
+	var cameraId: CMIOObjectID? = nil
+
+	if let devices = devices {
+		for offset in stride(from: 0, to: dataSize, by: MemoryLayout<CMIOObjectID>.size) {
+			let current = devices.advanced(by: Int(offset)).assumingMemoryBound(to: CMIOObjectID.self)
+			cameraId = current.pointee
+		}
+	}
+
+	free(devices)
+
+	return cameraId
+}
+
+public func isCameraOn() -> Bool {
+	guard let camera = getCameraProp() else {
+		return false
+	}
+
+	var opa = CMIOObjectPropertyAddress(
+		mSelector: CMIOObjectPropertySelector(kCMIODevicePropertyDeviceIsRunningSomewhere),
+		mScope: CMIOObjectPropertyScope(kCMIOObjectPropertyScopeWildcard),
+		mElement: CMIOObjectPropertyElement(kCMIOObjectPropertyElementWildcard)
+	)
+
+	var isUsed: Bool? = nil
+
+	var (dataSize, dataUsed) = (UInt32(0), UInt32(0))
+	var result = CMIOObjectGetPropertyDataSize(camera, &opa, 0, nil, &dataSize)
+	if result == OSStatus(kCMIOHardwareNoError) {
+		if let data = malloc(Int(dataSize)) {
+			result = CMIOObjectGetPropertyData(camera, &opa, 0, nil, dataSize, &dataUsed, data)
+			let on = data.assumingMemoryBound(to: UInt8.self)
+			isUsed = on.pointee != 0
+		}
+	}
+
+	return isUsed ?? false
+}

license

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+The MIT License (MIT)
+
+Copyright (c) Sindre Sorhus <sindresorhus@gmail.com> (sindresorhus.com)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

readme.md

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+# is-camera-on
+
+> Check if the built-in Mac camera is on
+
+The camera is commonly known as FaceTime HD or iSight.
+
+This module can be useful to check if the camera is already in use or notify you if it's turned on when you didn't intend it to be.
+
+
+## Requirements
+
+- Xcode 8+
+- macOS 10.11+
+
+
+## Install
+
+With [SPM](https://swift.org/package-manager/):
+
+```swift
+.Package(url: "https://github.com/sindresorhus/is-camera-on", majorVersion: 1)
+```
+
+
+## Usage
+
+```swift
+import IsCameraOn
+
+print(isCameraOn())
+//=> true
+```
+
+
+## Related
+
+- [node-is-camera-on](https://github.com/sindresorhus/node-is-camera-on) - Node.js wrapper for this module
+- [is-camera-on-cli](https://github.com/sindresorhus/is-camera-on-cli) - CLI for this module
+
+
+## License
+
+MIT © [Sindre Sorhus](https://sindresorhus.com)