annotate data/fileio/MIDIFileWriter.h @ 1008:d9e0e59a1581

When using an aggregate model to pass data to a transform, zero-pad the shorter input to the duration of the longer rather than truncating the longer. (This is better behaviour for e.g. MATCH, and in any case the code was previously truncating incorrectly and ending up with garbage data at the end.)

/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    Sonic Visualiser
    An audio file viewer and annotation editor.
    Centre for Digital Music, Queen Mary, University of London.
    
    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; either version 2 of the
    License, or (at your option) any later version.  See the file
    COPYING included with this distribution for more information.
*/


/*
   This is a modified version of a source file from the 
   Rosegarden MIDI and audio sequencer and notation editor.
   This file copyright 2000-2007 Richard Bown and Chris Cannam
   and copyright 2007 QMUL.
*/

#ifndef _MIDI_FILE_WRITER_H_
#define _MIDI_FILE_WRITER_H_

#include "base/RealTime.h"

#include <QString>

#include <vector>
#include <map>
#include <fstream>

class MIDIEvent;
class NoteExportable;

/**
 * Write a MIDI file.  This includes file write code for generic
 * simultaneous-track MIDI files, but the conversion stage only
 * supports a single-track MIDI file with fixed tempo, time signature
 * and timing division.
 */
class MIDIFileWriter 
{
public:
    MIDIFileWriter(QString path, 
                   const NoteExportable *exportable, 
                   int sampleRate, // used to convert exportable sample timings
                   float tempo = 120.f);
    virtual ~MIDIFileWriter();

    virtual bool isOK() const;
    virtual QString getError() const;

    virtual void write();

protected:
    typedef std::vector<MIDIEvent *> MIDITrack;
    typedef std::map<unsigned int, MIDITrack> MIDIComposition;

    typedef enum {
	MIDI_SINGLE_TRACK_FILE          = 0x00,
	MIDI_SIMULTANEOUS_TRACK_FILE    = 0x01,
	MIDI_SEQUENTIAL_TRACK_FILE      = 0x02,
	MIDI_FILE_BAD_FORMAT            = 0xFF
    } MIDIFileFormatType;

    std::string intToMIDIBytes(int number) const;
    std::string longToMIDIBytes(unsigned long number) const;
    std::string longToVarBuffer(unsigned long number) const;

    unsigned long getMIDITimeForTime(RealTime t) const;

    bool writeHeader();
    bool writeTrack(int track);
    bool writeComposition();
    
    bool convert();

    QString               m_path;
    const NoteExportable *m_exportable;
    int                   m_sampleRate;
    float                 m_tempo;
    int                   m_timingDivision;   // pulses per quarter note
    MIDIFileFormatType    m_format;
    unsigned int          m_numberOfTracks;

    MIDIComposition       m_midiComposition;

    std::ofstream        *m_midiFile;
    QString               m_error;
};

#endif