IMedia: constify tracks accessors

include/medialibrary/IMedia.h

@@ -140,8 +140,8 @@ class IMedia
         virtual bool removeLabel( LabelPtr label ) = 0;
         virtual MoviePtr movie() const = 0;
         virtual Query<ILabel> labels() const = 0;
-        virtual Query<IVideoTrack> videoTracks() = 0;
-        virtual Query<IAudioTrack> audioTracks() = 0;
+        virtual Query<IVideoTrack> videoTracks() const = 0;
+        virtual Query<IAudioTrack> audioTracks() const = 0;
         ///
         /// \brief thumbnail Returns the path of a thumbnail for this media
         /// \return A path, relative to the thumbnailPath configured when initializing

src/Media.cpp

@@ -251,7 +251,7 @@ bool Media::addVideoTrack(const std::string& codec, unsigned int width, unsigned
     return VideoTrack::create( m_ml, codec, width, height, fps, m_id, language, description ) != nullptr;
 }
 
-Query<IVideoTrack> Media::videoTracks()
+Query<IVideoTrack> Media::videoTracks() const
 {
     static const std::string req = "FROM " + policy::VideoTrackTable::Name +
             " WHERE media_id = ?";
@@ -265,7 +265,7 @@ bool Media::addAudioTrack( const std::string& codec, unsigned int bitrate,
     return AudioTrack::create( m_ml, codec, bitrate, sampleRate, nbChannels, language, desc, m_id ) != nullptr;
 }
 
-Query<IAudioTrack> Media::audioTracks()
+Query<IAudioTrack> Media::audioTracks() const
 {
     static const std::string req = "FROM " + policy::AudioTrackTable::Name +
             " WHERE media_id = ?";

src/Media.h

@@ -100,10 +100,10 @@ class Media : public IMedia, public DatabaseHelpers<Media, policy::MediaTable>
         void setMovie( MoviePtr movie );
         bool addVideoTrack( const std::string& codec, unsigned int width, unsigned int height,
                             float fps, const std::string& language, const std::string& description );
-        virtual Query<IVideoTrack> videoTracks() override;
+        virtual Query<IVideoTrack> videoTracks() const override;
         bool addAudioTrack( const std::string& codec, unsigned int bitrate, unsigned int sampleRate,
                             unsigned int nbChannels, const std::string& language, const std::string& desc );
-        virtual Query<IAudioTrack> audioTracks() override;
+        virtual Query<IAudioTrack> audioTracks() const override;
         virtual const std::string& thumbnail() const override;
         virtual bool isThumbnailGenerated() const override;
         virtual bool setThumbnail( const std::string &thumbnail ) override;