feat(video): adds an ID parameter to the VideoSource class

qtox.pro

@@ -414,6 +414,7 @@ SOURCES += \
     src/persistence/db/rawdatabase.cpp \
     src/persistence/history.cpp \
     src/video/videoframe.cpp \
+    src/video/videosource.cpp \
     src/video/cameradevice.cpp \
     src/video/camerasource.cpp \
     src/video/corevideosource.cpp \

src/video/videosource.cpp

@@ -0,0 +1,23 @@
+/*
+    Copyright © 2016 by The qTox Project
+
+    This file is part of qTox, a Qt-based graphical interface for Tox.
+
+    qTox is libre software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    qTox is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with qTox.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "videosource.h"
+
+// Initialize sourceIDs to 0
+VideoSource::AtomicIDType VideoSource::sourceIDs {0};

src/video/videosource.h

@@ -21,6 +21,8 @@
 #define VIDEOSOURCE_H
 
 #include <QObject>
+
+#include <atomic>
 #include <memory>
 
 class VideoFrame;
@@ -35,7 +37,12 @@ class VideoSource : public QObject
 {
     Q_OBJECT
 
+    using IDType = std::uint_fast64_t;
+    using AtomicIDType = std::atomic_uint_fast64_t;
+
 public:
+    VideoSource() : id(sourceIDs.fetch_add(std::memory_order_relaxed)){}
+
     virtual ~VideoSource() = default;
     /**
     If subscribe sucessfully opens the source, it will start emitting frameAvailable signals.
@@ -46,6 +53,8 @@ public:
     */
     virtual void unsubscribe() = 0;
 
+    /// ID of this VideoSource
+    const IDType id;
 signals:
     /**
     Emitted when new frame available to use.
@@ -57,6 +66,9 @@ signals:
     but might restart sending frames again later
     */
     void sourceStopped();
+private:
+    /// Used to manage a global ID for all VideoSources
+    static AtomicIDType sourceIDs;
 };
 
 #endif // VIDEOSOURCE_H