Started a bit on a PlaybackQueue class.

src/core/PlaybackQueue.cpp

@@ -0,0 +1,83 @@
+//////////////////////////////////////////////////////////////////////////////
+// Copyright © 2007, mC2 team
+//
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without 
+// modification, are permitted provided that the following conditions are met:
+//
+//    * Redistributions of source code must retain the above copyright notice,
+//      this list of conditions and the following disclaimer.
+//
+//    * Redistributions in binary form must reproduce the above copyright 
+//      notice, this list of conditions and the following disclaimer in the 
+//      documentation and/or other materials provided with the distribution.
+//
+//    * Neither the name of the author nor the names of other contributors may 
+//      be used to endorse or promote products derived from this software 
+//      without specific prior written permission. 
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
+// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 
+// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
+// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
+// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
+// POSSIBILITY OF SUCH DAMAGE. 
+//
+//////////////////////////////////////////////////////////////////////////////
+#include "pch.hpp"
+#include "PlaybackQueue.h"
+
+using namespace musik::core;
+
+//////////////////////////////////////////////////////////////////////////////
+
+PlaybackQueue PlaybackQueue::sInstance;
+
+
+PlaybackQueue::PlaybackQueue(void) :
+    nowPlaying( new musik::core::tracklist::Standard() )
+{
+}
+
+PlaybackQueue::~PlaybackQueue(void)
+{
+}
+
+tracklist::IRandomAccessPtr PlaybackQueue::NowPlayingTracklist(){
+    return this->nowPlaying;
+}
+
+void PlaybackQueue::Play(){
+
+    TrackPtr track(this->CurrentTrack());
+
+    if(track){
+        // If current track exists
+        this->transport.Start(track->GetValue("path"));
+    }
+
+}
+
+TrackPtr PlaybackQueue::CurrentTrack(){
+    if(!this->currentTrack){
+        // If the current track is empty, get a track from the nowPlaying tracklist
+        this->SetCurrentTrack( this->nowPlaying->CurrentTrack() );
+    }
+    return this->currentTrack;
+}
+
+void PlaybackQueue::SetCurrentTrack(TrackPtr track){
+    if(this->currentTrack!=track){
+        this->currentTrack  = track;
+
+        // Call the signal if track updates
+        this->CurrentTrackChanged(track);
+    }
+}
+

src/core/PlaybackQueue.h

@@ -0,0 +1,85 @@
+//////////////////////////////////////////////////////////////////////////////
+// Copyright © 2007, mC2 team
+//
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without 
+// modification, are permitted provided that the following conditions are met:
+//
+//    * Redistributions of source code must retain the above copyright notice,
+//      this list of conditions and the following disclaimer.
+//
+//    * Redistributions in binary form must reproduce the above copyright 
+//      notice, this list of conditions and the following disclaimer in the 
+//      documentation and/or other materials provided with the distribution.
+//
+//    * Neither the name of the author nor the names of other contributors may 
+//      be used to endorse or promote products derived from this software 
+//      without specific prior written permission. 
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
+// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 
+// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
+// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
+// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
+// POSSIBILITY OF SUCH DAMAGE. 
+//
+//////////////////////////////////////////////////////////////////////////////
+
+#pragma once
+
+//////////////////////////////////////////////////////////////////////////////
+
+#include <core/audio/Transport.h>
+#include <core/tracklist/Standard.h>
+#include <core/Query/Tracks.h>
+#include <sigslot/sigslot.h>
+
+//////////////////////////////////////////////////////////////////////////////
+
+namespace musik { namespace core { 
+
+//////////////////////////////////////////////////////////////////////////////
+
+class PlaybackQueue{
+    private:
+        PlaybackQueue(void);
+        static PlaybackQueue sInstance;
+
+        audio::Transport transport;
+        tracklist::IRandomAccessPtr nowPlaying;
+
+    public:
+        ~PlaybackQueue(void);
+        static PlaybackQueue& Instance(){ return sInstance; };
+
+        // Now Playing control
+        tracklist::IRandomAccessPtr NowPlayingTracklist();
+        void Play(tracklist::IRandomAccess &tracklist);
+        void Append(tracklist::IRandomAccess &tracklist);
+
+        // Playback Control
+        void Play();
+        void Next();
+        void Previos();
+        void Stop();
+
+        musik::core::TrackPtr CurrentTrack();
+
+        // Public signals
+        sigslot::signal1<musik::core::TrackPtr> CurrentTrackChanged;
+
+    private:
+        TrackPtr currentTrack;
+        void SetCurrentTrack(TrackPtr track);
+
+};
+
+//////////////////////////////////////////////////////////////////////////////
+} } // musik::core
+//////////////////////////////////////////////////////////////////////////////

src/core/core.vcproj

@@ -174,6 +174,14 @@
 				RelativePath=".\pch.hpp"
 				>
 			</File>
+			<File
+				RelativePath=".\PlaybackQueue.cpp"
+				>
+			</File>
+			<File
+				RelativePath=".\PlaybackQueue.h"
+				>
+			</File>
 			<Filter
 				Name="support"
 				>

src/core/tracklist/IRandomAccess.h

@@ -37,6 +37,7 @@
 #pragma once
 
 #include "core/tracklist/IBase.h"
+#include <boost/shared_ptr.hpp>
 
 namespace musik{ namespace core{
     namespace tracklist {
@@ -49,6 +50,9 @@ namespace musik{ namespace core{
                 virtual void SetCurrentPosition(int position) = 0;
                 virtual int CurrentPosition() = 0;
         };
+
+        typedef boost::shared_ptr<IRandomAccess> IRandomAccessPtr;
+
     }
 } }