vlc: add chromecastSupport option

Enables Chromecast support by default in VLC.

Fixes #58365.

Includes release note.

nixos/doc/manual/release-notes/rl-1909.xml

@@ -99,6 +99,16 @@
      and fix all the bugs it uncovers.
     </para>
    </listitem>
+   <listitem>
+    <para>
+     The <literal>vlc</literal> package gained support for Chromecast
+     streaming, enabled by default. TCP port 8010 must be open for it to work,
+     so something like <literal>networking.firewall.allowedTCPPorts = [ 8010
+     ];</literal> may be required in your configuration. Also consider enabling
+     <link xlink:href="https://nixos.wiki/wiki/Accelerated_Video_Playback">
+     Accelerated Video Playback</link> for better transcoding performance.
+    </para>
+   </listitem>
   </itemizedlist>
  </section>
 </section>

pkgs/applications/video/vlc/default.nix

@@ -13,8 +13,13 @@
 , jackSupport ? false
 , fetchpatch
 , removeReferencesTo
+, chromecastSupport ? true, protobuf, libmicrodns
 }:
 
+# chromecastSupport requires TCP port 8010 to be open for it to work.
+# If your firewall is enabled, make sure to have something like:
+#   networking.firewall.allowedTCPPorts = [ 8010 ];
+
 with stdenv.lib;
 
 assert (withQt5 -> qtbase != null && qtsvg != null && qtx11extras != null);
@@ -42,7 +47,8 @@ stdenv.mkDerivation rec {
     fluidsynth wayland wayland-protocols
   ] ++ optional (!stdenv.hostPlatform.isAarch64) live555
     ++ optionals withQt5    [ qtbase qtsvg qtx11extras ]
-    ++ optional jackSupport libjack2;
+    ++ optional jackSupport libjack2
+    ++ optionals chromecastSupport [ protobuf libmicrodns ];
 
   nativeBuildInputs = [ autoreconfHook perl pkgconfig removeReferencesTo ];
 
@@ -76,7 +82,12 @@ stdenv.mkDerivation rec {
   # "--enable-foo" flags here
   configureFlags = [
     "--with-kde-solid=$out/share/apps/solid/actions"
-  ] ++ optional onlyLibVLC "--disable-vlc";
+  ] ++ optional onlyLibVLC "--disable-vlc"
+    ++ optionals chromecastSupport [
+    "--enable-sout"
+    "--enable-chromecast"
+    "--enable-microdns"
+  ];
 
   # Remove runtime dependencies on libraries
   postConfigure = ''