midicontextvisitor.h

/*
  MusicXML Library
  Copyright (C) Grame 2006-2013
 
  This Source Code Form is subject to the terms of the Mozilla Public
  License, v. 2.0. If a copy of the MPL was not distributed with this
  file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
  Grame Research Laboratory, 11, cours de Verdun Gensoul 69002 Lyon - France
  research@grame.fr
*/
 
#ifndef __midiContextVisitor__
#define __midiContextVisitor__
 
#include <string>
#include <map>
#include "xml.h"
#include "typedefs.h"
#include "visitor.h"
#include "notevisitor.h"
#include "transposevisitor.h"
 
namespace MusicXML2 
{
 
class EXP scoreInstrument : 
    public visitor<S_score_instrument>,
    public visitor<S_instrument_name>,
    public visitor<S_instrument_abbreviation>
{
    protected:
        virtual void reset();
        virtual void visitStart( S_score_instrument& elt );
        virtual void visitStart( S_instrument_name& elt );
        virtual void visitStart( S_instrument_abbreviation& elt );
 
    public:
                 scoreInstrument() {}
        virtual ~scoreInstrument() {}
 
        std::string fName;          
        std::string fAbbreviation;  
        std::string fID;            
};
 
class EXP midiInstrument : 
    public visitor<S_midi_instrument>,
    public visitor<S_midi_channel>,
    public visitor<S_midi_name>,
    public visitor<S_midi_bank>,
    public visitor<S_midi_program>,
    public visitor<S_midi_unpitched>,
    public visitor<S_volume>
{
    protected:
        virtual void reset();
        virtual void visitStart( S_midi_instrument& elt );
        virtual void visitStart( S_midi_channel& elt );
        virtual void visitStart( S_midi_name& elt );
        virtual void visitStart( S_midi_bank& elt );
        virtual void visitStart( S_midi_program& elt );
        virtual void visitStart( S_volume& elt );
        virtual void visitStart( S_midi_unpitched& elt );
 
    public:
                 midiInstrument() : fChan(-1), fBank(-1), fProgram(-1), fVolume(-1), fUnpitched(-1) {}
        virtual ~midiInstrument() {}
 
        int fChan;          
        int fBank;          
        int fProgram;       
        int fVolume;        
        int fUnpitched;     
        std::string fMIDIName;  
        std::string fID;    
};
 
 
class midiwriter {
    public:
        enum pedalType { kDamperPedal, kSoftpedal, kSostenutoPedal };
 
        virtual ~midiwriter() {}
        
        virtual void startPart (int instrCount) = 0;
        virtual void newInstrument (std::string instrName, int chan=-1) = 0;
        virtual void endPart (long date) = 0;
 
        virtual void newNote (long date, int chan, float pitch, int velocity, int duration) = 0;
        virtual void tempoChange (long date, int bpm) = 0;
        virtual void pedalChange (long date, pedalType t, int value) = 0;
 
        virtual void volChange (long date, int chan, int vol) = 0;
        virtual void bankChange (long date, int chan, int bank) = 0;
        virtual void progChange (long date, int chan, int prog) = 0;
};
 
 
class EXP midicontextvisitor : 
    public notevisitor,
    public transposevisitor,
    public midiInstrument,
    public scoreInstrument,
    public visitor<S_divisions>,
    public visitor<S_backup>,
    public visitor<S_forward>,
    public visitor<S_midi_device>,
    public visitor<S_measure>,
    public visitor<S_part>,
    public visitor<S_score_part>,
    public visitor<S_sound>
{
    private:
        typedef std::multimap<std::string, scoreInstrument> instrumentsList;
        typedef std::map<std::string, midiInstrument>  midi_instrumentsList;
        instrumentsList      fScoreInstruments;
        midi_instrumentsList fMidiInstruments;
        std::string          fCurrentPartID;
 
        bool    fInBackup;      // In backup state
        bool    fInForward;     // In forward state
        bool    fInSound;       // In sound element
        long    fEndMeasureDate;    // max of the date kept in a measure
        long    fEndPartDate;       // max of the part duration
   
    protected:
        midiwriter* fMidiWriter;
        long        fDivisions;         // current division
        long        fCurrentDate;       // current date
        long        fLastPosition;      // last time position (used for chord)
        long        fPendingDuration;   // pending duration (used for tied notes)
        long        fCurrentDynamics;   // current dynamics ie MIDI velocity
        long        fTranspose;         // current transpose value
        long        fTPQ;               // ticks-per-quater value for date conversion
        long        fCurrentChan;       // current midi channel
        
        void addDuration(long dur);     // move the current time, dur must be expressed in tpq
        long convert2Tick(long val) { return (val*fTPQ)/fDivisions; }
        long convert2Vel(long val)  { return  (val * 90) / 100; }
 
        virtual void playScoreInstrument (const scoreInstrument& instr);
        virtual void playMidiInstrument (const midiInstrument& instr);
        virtual void playNote (const notevisitor& note);
        virtual void playTempoChange (long bmp);
        virtual void playPedalChange (midiwriter::pedalType type, const std::string& val);
 
        virtual void visitStart( S_divisions& elt );
        virtual void visitStart( S_duration& elt );
        virtual void visitStart( S_backup& elt )    { fInBackup = true; }
        virtual void visitEnd  ( S_backup& elt )    { fInBackup = false; }
        virtual void visitStart( S_forward& elt )   { fInForward = true; }
        virtual void visitEnd  ( S_forward& elt )   { fInForward = false; }
        virtual void visitEnd  ( S_score_instrument& elt );
        virtual void visitStart( S_midi_device& elt );
        virtual void visitEnd  ( S_midi_instrument& elt );
        virtual void visitEnd  ( S_measure& elt );
        virtual void visitStart( S_part& elt );
        virtual void visitEnd  ( S_part& elt );
        virtual void visitEnd  ( S_note& elt );
        virtual void visitStart( S_score_part& elt );
        virtual void visitEnd  ( S_score_part& elt );
        virtual void visitStart( S_sound& elt );
        virtual void visitEnd  ( S_sound& elt )     { fInSound = false; }
        virtual void visitEnd  ( S_transpose& elt );
 
    public:    
                 midicontextvisitor(long tpq, midiwriter* writer=0);
        virtual ~midicontextvisitor();
};
 
}
 
#endif