call: support screen sharing for macOS

Change-Id: I6737763f9920fbc1b32ee558980b4ef1daadaff8

src/media/video/video_input.cpp

@@ -430,6 +430,31 @@ VideoInput::initX11(std::string display)
     return true;
 }
 
+bool
+VideoInput::initAVFoundation(const std::string& display)
+{
+    size_t space = display.find(' ');
+
+    clearOptions();
+    decOpts_.format = "avfoundation";
+    decOpts_.input = "Capture screen 0";
+    decOpts_.framerate = 30;
+
+    if (space != std::string::npos) {
+        std::istringstream iss(display.substr(space + 1));
+        char sep;
+        unsigned w, h;
+        iss >> w >> sep >> h;
+        decOpts_.width = round2pow(w, 3);
+        decOpts_.height = round2pow(h, 3);
+    } else {
+        decOpts_.width = default_grab_width;
+        decOpts_.height = default_grab_height;
+    }
+    return true;
+}
+
+
 bool
 VideoInput::initGdiGrab(std::string params)
 {
@@ -535,10 +560,12 @@ VideoInput::switchInput(const std::string& resource)
         ready = initCamera(suffix);
     } else if (prefix == DRing::Media::VideoProtocolPrefix::DISPLAY) {
         /* X11 display name */
-#ifndef _WIN32
-        ready = initX11(suffix);
-#else
+#ifdef __APPLE__
+        ready = initAVFoundation(suffix);
+#elif defined(_WIN32)
         ready = initGdiGrab(suffix);
+#else
+        ready = initX11(suffix);
 #endif
     } else if (prefix == DRing::Media::VideoProtocolPrefix::FILE) {
         /* Pathname */

src/media/video/video_input.h

@@ -118,6 +118,7 @@ private:
     // true if decOpts_ is ready to use, false if using promise/future
     bool initCamera(const std::string& device);
     bool initX11(std::string display);
+    bool initAVFoundation(const std::string& display);
     bool initFile(std::string path);
     bool initGdiGrab(std::string params);