Request authorization for access to camera and microphone on Mac

CMakeLists.txt

@@ -2,7 +2,11 @@ cmake_minimum_required(VERSION 3.13.0)
 
 set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>DLL")
 
-project(sdrangel)
+if(APPLE)
+    project(sdrangel LANGUAGES CXX OBJCXX)
+else()
+    project(sdrangel)
+endif()
 
 list(APPEND CMAKE_MODULE_PATH ${CMAKE_SOURCE_DIR}/cmake/Modules)
 
@@ -911,6 +915,7 @@ target_link_libraries(sdrangelbench
   sdrbench
   logging
 )
+
 ############ build sdrangel gui ################
 if (BUILD_GUI)
     set(sdrangel_SOURCES
@@ -918,7 +923,9 @@ if (BUILD_GUI)
         sdrgui/resources/sdrangel.rc
         settings/settings.qrc
     )
-
+    if(APPLE)
+        set(sdrangel_SOURCES ${sdrangel_SOURCES} mac/auth.mm)
+    endif()
     if(ANDROID AND NOT ENABLE_QT6)
         add_library(${CMAKE_PROJECT_NAME} SHARED ${sdrangel_SOURCES})
     elseif(ANDROID)
@@ -970,7 +977,10 @@ if (BUILD_GUI)
           sdrbase
           sdrgui
           logging
-      )
+)
+  endif()
+  if(APPLE)
+      target_link_libraries(${CMAKE_PROJECT_NAME} "-framework AVFoundation" objc)
   endif()
 
   if(WIN32)

app/main.cpp

@@ -220,6 +220,12 @@ int main(int argc, char* argv[])
     sfc.setVersion(3, 3);
     sfc.setProfile(QSurfaceFormat::CoreProfile);
     QSurfaceFormat::setDefaultFormat(sfc);
+
+    // Request authorization for access to camera and microphone (mac/auth.mm)
+    extern int authCameraAndMic();
+    if (authCameraAndMic() < 0) {
+        qWarning("Failed to authorize access to camera and microphone. Enable access in System Settings > Privacy & Security");
+    }
 #endif
 
 #ifdef ANDROID

mac/auth.mm

@@ -0,0 +1,35 @@
+// Request permission.authorization to use camera and microphone
+// From: https://developer.apple.com/documentation/bundleresources/information_property_list/protected_resources/requesting_authorization_for_media_capture_on_macos?language=objc
+
+#include <AVFoundation/AVFoundation.h>
+
+// Returns:
+//   1 - if permission granted,
+//   0 - if pending,
+//  -1 - if not granted.
+int authCameraAndMic()
+{
+    // Request permission to access the camera and microphone.
+    switch ([AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo])
+    {
+    case AVAuthorizationStatusAuthorized:
+        // The user has previously granted access to the camera.
+        return 1;
+    case AVAuthorizationStatusNotDetermined:
+        {
+            // The app hasn't yet asked the user for camera access.
+            [AVCaptureDevice requestAccessForMediaType:AVMediaTypeVideo completionHandler:^(BOOL granted) {
+                if (granted) {
+                }
+            }];
+            return 0;
+        }
+    case AVAuthorizationStatusDenied:
+        // The user has previously denied access.
+        return -1;
+    case AVAuthorizationStatusRestricted:
+        // The user can't grant access due to restrictions.
+        return -1;
+    }
+}
+