CMake tweaks to make the project more linux packager friendly (#384)

* CMake tweaks to make the project more linux packager friendly

- Add install target for tsMuxerGUI
- Add install for contributed desktop file
- Install icon for desktop file
- Don't check for C when all sources are C++.

CMakeLists.txt

@@ -1,5 +1,5 @@
 cmake_minimum_required (VERSION 3.1)
-project (tsmuxer_main)
+project (tsmuxer_main CXX)
 
 set(CMAKE_CXX_STANDARD 14)
 set(CMAKE_CXX_STANDARD_REQUIRED TRUE)
@@ -23,6 +23,16 @@ else()
 endif()
 add_definitions("-DTSMUXER_VERSION=\"${TSMUXER_VERSION}\"")
 
+if(NOT MSVC)
+  include(GNUInstallDirs)
+  mark_as_advanced(CLEAR
+    CMAKE_INSTALL_BINDIR
+	CMAKE_INSTALL_DATADIR
+  )
+else(NOT MSVC)
+  set(CMAKE_INSTALL_BINDIR bin)
+endif(NOT MSVC)
+
 add_subdirectory (libmediation)
 add_subdirectory (tsMuxer)
 if(TSMUXER_GUI)

tsMuxer/CMakeLists.txt

@@ -113,4 +113,4 @@ else()
   target_include_directories(tsmuxer PRIVATE ${FREETYPE2_INCLUDE_DIRS})
 endif()
 
-install (TARGETS tsmuxer DESTINATION bin)
+install (TARGETS tsmuxer DESTINATION ${CMAKE_INSTALL_BINDIR})

tsMuxerGUI/CMakeLists.txt

@@ -1,5 +1,5 @@
 cmake_minimum_required (VERSION 3.1)
-project(tsMuxerGUI)
+project(tsMuxerGUI CXX)
 
 set(CMAKE_AUTOMOC ON)
 set(CMAKE_AUTORCC ON)
@@ -31,6 +31,14 @@ set(tsmuxer_gui_sources
 add_executable(tsMuxerGUI ${tsmuxer_gui_sources})
 target_link_libraries(tsMuxerGUI Qt5::Widgets Qt5::Multimedia)
 
+if(NOT MSVC)
+  install(TARGETS tsMuxerGUI DESTINATION ${CMAKE_INSTALL_BINDIR})
+  install(FILES tsMuxerGUI.desktop DESTINATION ${CMAKE_INSTALL_DATADIR}/applications)
+  install(FILES images/icon.png
+          DESTINATION ${CMAKE_INSTALL_DATADIR}/icons/hicolor/128x128/apps/
+		  RENAME tsMuxerGUI.png)
+endif(NOT MSVC)
+
 if (WIN32)
   target_sources(tsMuxerGUI PRIVATE icon.rc)
 elseif (APPLE)

tsMuxerGUI/tsMuxerGUI.desktop

@@ -0,0 +1,8 @@
+[Desktop Entry]
+Version=1.0
+Type=Application
+Name=TS Muxer GUI
+Comment=Transport stream muxer for remuxing/muxing elementary streams
+Exec=tsMuxerGUI
+Icon=tsMuxerGUI
+Categories=AudioVideo;