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view data/fileio/MIDIFileReader.h @ 749:0f8a6dda8ac1
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author | Chris Cannam |
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date | Mon, 03 Sep 2012 11:10:51 +0100 |
parents | eb1b517f5eeb |
children | 59e7fe1b1003 |
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/* -*- 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; typedef unsigned char MIDIByte; class MIDIFileImportPreferenceAcquirer // welcome to our grand marble foyer { public: enum TrackPreference { ImportNothing, ImportSingleTrack, MergeAllTracks, MergeAllNonPercussionTracks }; virtual ~MIDIFileImportPreferenceAcquirer() { } virtual TrackPreference getTrackImportPreference (QStringList trackNames, bool haveSomePercussion, QString &singleTrack) const = 0; virtual void showError(QString error) = 0; }; class MIDIFileReader : public DataFileReader { Q_OBJECT public: MIDIFileReader(QString path, MIDIFileImportPreferenceAcquirer *pref, size_t mainModelSampleRate); virtual ~MIDIFileReader(); virtual bool isOK() const; virtual QString getError() const; virtual Model *load() const; 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(); bool m_smpte; int m_timingDivision; // pulses per quarter note int m_fps; // if smpte int m_subframes; // if smpte 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; MIDIFileImportPreferenceAcquirer *m_acquirer; }; #endif // _MIDI_FILE_READER_H_