Look for all available sound input libs as needed, and warn if not found

CMakeLists.txt

@@ -36,8 +36,8 @@ option(BUILD_WITH_CODE_COVERAGE "Enable code coverage with gconv" OFF)
 option(BUILD_UNITTESTS "Enable Unittests with Google C++ Unittest ang GMock frameworks" OFF)
 
 # Sound source selection
-option(USE_FFMPEG "use ffmpeg for sound" OFF)
-option(USE_AUDIERE "use audiere for sound" OFF)
+option(USE_FFMPEG "use ffmpeg for sound" ON)
+option(USE_AUDIERE "use audiere for sound" ON)
 option(USE_MPG123 "use mpg123 + libsndfile for sound" ON)
 
 # OS X deployment
@@ -137,31 +137,53 @@ set(OPENMW_LIBS ${OENGINE_ALL})
 set(OPENMW_LIBS_HEADER)
 
 # Sound setup
+set(GOT_SOUND_INPUT 0)
 set(SOUND_INPUT_INCLUDES "")
 set(SOUND_INPUT_LIBRARY "")
 set(SOUND_DEFINE "")
 if (USE_FFMPEG)
     set(FFmpeg_FIND_COMPONENTS AVCODEC AVFORMAT AVUTIL SWSCALE)
-    find_package(FFmpeg REQUIRED)
-    set(SOUND_INPUT_INCLUDES ${SOUND_INPUT_INCLUDES} ${FFMPEG_INCLUDE_DIRS})
-    set(SOUND_INPUT_LIBRARY ${SOUND_INPUT_LIBRARY} ${FFMPEG_LIBRARIES})
-    set(SOUND_DEFINE ${SOUND_DEFINE} -DOPENMW_USE_FFMPEG)
+    find_package(FFmpeg)
+    if (FFMPEG_FOUND)
+        set(SOUND_INPUT_INCLUDES ${SOUND_INPUT_INCLUDES} ${FFMPEG_INCLUDE_DIRS})
+        set(SOUND_INPUT_LIBRARY ${SOUND_INPUT_LIBRARY} ${FFMPEG_LIBRARIES})
+        set(SOUND_DEFINE ${SOUND_DEFINE} -DOPENMW_USE_FFMPEG)
+        set(GOT_SOUND_INPUT 1)
+    endif (FFMPEG_FOUND)
 endif (USE_FFMPEG)
 
-if (USE_AUDIERE)
-    find_package(Audiere REQUIRED)
-    set(SOUND_INPUT_INCLUDES ${SOUND_INPUT_INCLUDES} ${AUDIERE_INCLUDE_DIR})
-    set(SOUND_INPUT_LIBRARY ${SOUND_INPUT_LIBRARY} ${AUDIERE_LIBRARY})
-    set(SOUND_DEFINE ${SOUND_DEFINE} -DOPENMW_USE_AUDIERE)
-endif (USE_AUDIERE)
-
-if (USE_MPG123)
+if (USE_AUDIERE AND NOT GOT_SOUND_INPUT)
+    find_package(Audiere)
+    if (AUDIERE_FOUND)
+        set(SOUND_INPUT_INCLUDES ${SOUND_INPUT_INCLUDES} ${AUDIERE_INCLUDE_DIR})
+        set(SOUND_INPUT_LIBRARY ${SOUND_INPUT_LIBRARY} ${AUDIERE_LIBRARY})
+        set(SOUND_DEFINE ${SOUND_DEFINE} -DOPENMW_USE_AUDIERE)
+        set(GOT_SOUND_INPUT 1)
+    endif (AUDIERE_FOUND)
+endif (USE_AUDIERE AND NOT GOT_SOUND_INPUT)
+
+if (USE_MPG123 AND NOT GOT_SOUND_INPUT)
     find_package(MPG123 REQUIRED)
     find_package(SNDFILE REQUIRED)
-    set(SOUND_INPUT_INCLUDES ${SOUND_INPUT_INCLUDES} ${MPG123_INCLUDE_DIR} ${SNDFILE_INCLUDE_DIR})
-    set(SOUND_INPUT_LIBRARY ${SOUND_INPUT_LIBRARY} ${MPG123_LIBRARY} ${SNDFILE_LIBRARY})
-    set(SOUND_DEFINE ${SOUND_DEFINE} -DOPENMW_USE_MPG123)
-endif (USE_MPG123)
+    if (MPG123_FOUND AND SNDFILE_FOUND)
+        set(SOUND_INPUT_INCLUDES ${SOUND_INPUT_INCLUDES} ${MPG123_INCLUDE_DIR} ${SNDFILE_INCLUDE_DIR})
+        set(SOUND_INPUT_LIBRARY ${SOUND_INPUT_LIBRARY} ${MPG123_LIBRARY} ${SNDFILE_LIBRARY})
+        set(SOUND_DEFINE ${SOUND_DEFINE} -DOPENMW_USE_MPG123)
+        set(GOT_SOUND_INPUT 1)
+    endif (MPG123_FOUND AND SNDFILE_FOUND)
+endif (USE_MPG123 AND NOT GOT_SOUND_INPUT)
+
+if (NOT GOT_SOUND_INPUT)
+    message(WARNING "--------------------")
+    message(WARNING "Failed to find any sound input packages")
+    message(WARNING "--------------------")
+endif (NOT GOT_SOUND_INPUT)
+
+if (NOT FFMPEG_FOUND)
+    message(WARNING "--------------------")
+    message(WARNING "FFmpeg not found, video playback will be disabled")
+    message(WARNING "--------------------")
+endif (NOT FFMPEG_FOUND)
 
 
 # Platform specific