songstream.h

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/*
 * songstream.h, Author: Andrea Rizzi <88whacko@gmail.com>
 *
 * Copyright (C) 2001-2011 Atomic Blue (info@planeshift.it, http://www.atomicblue.org)
 *
 *
 * 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 (version 2 of the License)
 * 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.
 *
 */

#ifndef SONGSTREAM_H
#define SONGSTREAM_H


//====================================================================================
// Crystal Space Includes
//====================================================================================
#include <cssysdef.h>
#include <csutil/ref.h>
#include <csutil/randomgen.h>
#include <csplugincommon/sndsys/sndstream.h>

//------------------------------------------------------------------------------------
// Forward Declarations
//------------------------------------------------------------------------------------
class Instrument;
class SndSysSongData;
struct SongData;
struct csSndSysSoundFormat;

using namespace CS::SndSys;

class SndSysSongStream: public SndSysBasicStream
{
public:
    SndSysSongStream(csRef<SndSysSongData> soundData, SongData* songData, csSndSysSoundFormat* renderFormat, int mode3D);
    virtual ~SndSysSongStream();

    // From iSndSysStream
    //--------------------
    virtual void AdvancePosition(size_t frameDelta);
    virtual const char* GetDescription();
    virtual size_t GetFrameCount();

    // SndSysBasicStream overriding
    //------------------------------
    virtual bool AlwaysStream() const { return true; }
    virtual bool ResetPosition();
    virtual bool SetPosition(size_t newPosition) { return false; } // not supported
    virtual bool SetLoopBoundaries(size_t startPosition, size_t endPosition) { return false; } // not supported

private:
    bool isFinished;                    
    size_t currentMeasure;              
    size_t currentNote;                 

    size_t lastRepeatStart;             
    size_t lastRepeatEnd;               
    int repeatCounter;                  
    csArray<uint> repeatsDone;          
    char* copyNoteBuffer;               
    size_t lastNoteSize;                

    SongData* songData;                 
    float timePerDivision;              
    csRef<SndSysSongData> soundData;    

    int conversionFactor;               
    bool conversionNeeded;              

    bool CheckPlaybackReadComplete();

    bool GetNextChord(char* &noteBuffer, size_t &noteBufferSize);

    void AdjustAlteration(char pitch, int &alter);

    void CopyNoteIntoBuffer(char* noteBuffer, size_t noteBufferSize);
};

#endif /* SONGSTREAM_H */