The Quake sources as originally release under the GPL license on December 21, 1999

WinQuake/cd_null.c

@@ -0,0 +1,55 @@
+/*
+Copyright (C) 1996-1997 Id Software, Inc.
+
+This program is free 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 2
+of the License, or (at your option) any later version.
+
+This program 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 this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+
+*/
+#include "quakedef.h"
+
+void CDAudio_Play(byte track, qboolean looping)
+{
+}
+
+
+void CDAudio_Stop(void)
+{
+}
+
+
+void CDAudio_Pause(void)
+{
+}
+
+
+void CDAudio_Resume(void)
+{
+}
+
+
+void CDAudio_Update(void)
+{
+}
+
+
+int CDAudio_Init(void)
+{
+	return 0;
+}
+
+
+void CDAudio_Shutdown(void)
+{
+}