comparison data/fileio/MIDIFileReader.h @ 148:1a42221a1522

* Reorganising code base.  This revision will not compile.

+/* -*- 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 2000-2006 Richard Bown and Chris Cannam.
+*/
+
+#ifndef _MIDI_FILE_READER_H_
+#define _MIDI_FILE_READER_H_
+
+#include "DataFileReader.h"
+#include "base/RealTime.h"
+
+#include <map>
+#include <set>
+#include <vector>
+
+#include <QObject>
+
+class MIDIEvent;
+
+class MIDIFileReader : public DataFileReader, public QObject
+{
+public:
+    MIDIFileReader(QString path, size_t mainModelSampleRate);
+    virtual ~MIDIFileReader();
+
+    virtual bool isOK() const;
+    virtual QString getError() const;
+    virtual Model *load() const;
+
+    typedef unsigned char MIDIByte;
+
+protected:
+    typedef std::vector<MIDIEvent *> MIDITrack;
+    typedef std::map<unsigned int, MIDITrack> MIDIComposition;
+    typedef std::pair<RealTime, double> TempoChange; // time, qpm
+    typedef std::map<unsigned long, TempoChange> TempoMap; // key is MIDI time
+
+    typedef enum {
+	MIDI_SINGLE_TRACK_FILE          = 0x00,
+	MIDI_SIMULTANEOUS_TRACK_FILE    = 0x01,
+	MIDI_SEQUENTIAL_TRACK_FILE      = 0x02,
+	MIDI_FILE_BAD_FORMAT            = 0xFF
+    } MIDIFileFormatType;
+
+    bool parseFile();
+    bool parseHeader(const std::string &midiHeader);
+    bool parseTrack(unsigned int &trackNum);
+
+    Model *loadTrack(unsigned int trackNum,
+		     Model *existingModel = 0,
+		     int minProgress = 0,
+		     int progressAmount = 100) const;
+
+    bool consolidateNoteOffEvents(unsigned int track);
+    void updateTempoMap(unsigned int track);
+    void calculateTempoTimestamps();
+    RealTime getTimeForMIDITime(unsigned long midiTime) const;
+
+    // Internal convenience functions
+    //
+    int  midiBytesToInt(const std::string &bytes);
+    long midiBytesToLong(const std::string &bytes);
+
+    long getNumberFromMIDIBytes(int firstByte = -1);
+
+    MIDIByte getMIDIByte();
+    std::string getMIDIBytes(unsigned long bytes);
+
+    bool skipToNextTrack();
+
+    int                    m_timingDivision;   // pulses per quarter note
+    MIDIFileFormatType     m_format;
+    unsigned int           m_numberOfTracks;
+
+    long                   m_trackByteCount;
+    bool                   m_decrementCount;
+
+    std::map<int, QString> m_trackNames;
+    std::set<unsigned int> m_loadableTracks;
+    std::set<unsigned int> m_percussionTracks;
+    MIDIComposition        m_midiComposition;
+    TempoMap               m_tempoMap;
+
+    QString                m_path;
+    std::ifstream         *m_midiFile;
+    size_t                 m_fileSize;
+    QString                m_error;
+    size_t                 m_mainModelSampleRate;
+};
+
+
+#endif // _MIDI_FILE_READER_H_