Fix building without OTIO support

Added a new CMake flag that stops any OTIO related cpp files being
built.

Added extra #ifdefs to catch any OTIO related code in other cpp
files.

app/codec/CMakeLists.txt

@@ -16,7 +16,9 @@
 
 add_subdirectory(ffmpeg)
 add_subdirectory(oiio)
-add_subdirectory(otio)
+if(OpenTimelineIO_FOUND)
+  add_subdirectory(otio)
+endif()
 
 set(OLIVE_SOURCES
   ${OLIVE_SOURCES}

app/codec/decoder.cpp

@@ -27,7 +27,9 @@
 #include "codec/ffmpeg/ffmpegcommon.h"
 #include "codec/ffmpeg/ffmpegdecoder.h"
 #include "codec/oiio/oiiodecoder.h"
+#ifdef USE_OTIO
 #include "codec/otio/otiodecoder.h"
+#endif
 #include "codec/waveinput.h"
 #include "codec/waveoutput.h"
 #include "common/filefunctions.h"
@@ -90,8 +92,9 @@ QVector<DecoderPtr> ReceiveListOfAllDecoders() {
 
   // The order in which these decoders are added is their priority when probing. Hence FFmpeg should usually be last,
   // since it supports so many formats and we presumably want to override those formats with a more specific decoder.
-
+#ifdef USE_OTIO
   decoders.append(std::make_shared<OTIODecoder>());
+#endif
   decoders.append(std::make_shared<OIIODecoder>());
   decoders.append(std::make_shared<FFmpegDecoder>());
 

app/core.cpp

@@ -53,7 +53,9 @@
 #include "render/diskmanager.h"
 #include "render/pixelformat.h"
 #include "render/shaderinfo.h"
+#ifdef USE_OTIO
 #include "task/project/exportotio/exportotiotask.h"
+#endif
 #include "task/project/import/import.h"
 #include "task/project/import/importerrordialog.h"
 #include "task/project/load/load.h"

app/task/project/CMakeLists.txt

@@ -14,7 +14,10 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-add_subdirectory(exportotio)
+if(OpenTimelineIO_FOUND)
+  add_subdirectory(exportotio)
+endif()
+
 add_subdirectory(import)
 add_subdirectory(load)
 add_subdirectory(save)