140 lines
4.1 KiB
C++
140 lines
4.1 KiB
C++
/*
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* Copyright (C) 2008-2014 David Robillard <d@drobilla.net>
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* Copyright (C) 2009-2017 Paul Davis <paul@linuxaudiosystems.com>
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* Copyright (C) 2009 Hans Baier <hansfbaier@googlemail.com>
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* Copyright (C) 2014-2016 Robin Gareus <robin@gareus.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef EVORAL_SMF_HPP
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#define EVORAL_SMF_HPP
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#include <glibmm/threads.h>
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#include <set>
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#include "evoral/visibility.h"
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#include "evoral/types.hpp"
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struct smf_struct;
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struct smf_track_struct;
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struct smf_tempo_struct;
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typedef smf_struct smf_t;
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typedef smf_track_struct smf_track_t;
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typedef smf_tempo_struct smf_tempo_t;
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namespace Evoral {
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#define THROW_FILE_ERROR throw(FileError)
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/** Standard Midi File.
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* Currently only tempo-based time of a given PPQN is supported.
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*
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* For WRITING: this object specifically wraps a type0 file or a type1 file with only a
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* single track. It has no support at this time for a type1 file with multiple
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* tracks.
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*
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* For READING: this object can read a single arbitrary track from a type1
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* file, or the single track of a type0 file. It has no support at this time
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* for reading more than 1 track.
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*/
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class LIBEVORAL_API SMF {
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public:
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class FileError : public std::exception {
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public:
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FileError (std::string const & n) : _file_name (n) {}
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~FileError () throw () {}
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const char* what() const throw() { return "Unknown SMF error"; }
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std::string file_name () const { return _file_name; }
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private:
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std::string _file_name;
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};
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SMF();
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virtual ~SMF();
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static bool test(const std::string& path);
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int open(const std::string& path, int track=1) THROW_FILE_ERROR;
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// XXX 19200 = 10 * Timecode::BBT_Time::ticks_per_beat
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int create(const std::string& path, int track=1, uint16_t ppqn=19200) THROW_FILE_ERROR;
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void close() THROW_FILE_ERROR;
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void seek_to_start() const;
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int seek_to_track(int track);
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int read_event(uint32_t* delta_t, uint32_t* size, uint8_t** buf, event_id_t* note_id) const;
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uint16_t num_tracks() const;
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uint16_t ppqn() const;
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bool is_empty() const { return _empty; }
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void begin_write();
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void append_event_delta(uint32_t delta_t, uint32_t size, const uint8_t* buf, event_id_t note_id);
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void end_write(std::string const &) THROW_FILE_ERROR;
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void flush() {};
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double round_to_file_precision (double val) const;
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bool is_type0 () const { return _type0; }
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std::set<uint8_t> channels () const { return _type0channels; }
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void track_names (std::vector<std::string>&) const;
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void instrument_names (std::vector<std::string>&) const;
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int num_tempos () const;
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/* This is exactly modelled on smf_tempo_t */
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struct Tempo {
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size_t time_pulses;
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double time_seconds;
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int microseconds_per_quarter_note;
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int numerator;
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int denominator;
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int clocks_per_click;
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int notes_per_note;
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Tempo ()
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: time_pulses (0)
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, time_seconds (0)
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, microseconds_per_quarter_note (-1)
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, numerator (-1)
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, denominator (-1)
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, clocks_per_click (-1)
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, notes_per_note (-1) {}
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Tempo (smf_tempo_t*);
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double tempo() const {
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return 60.0 * (1000000.0 / (double) microseconds_per_quarter_note);
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}
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};
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Tempo* tempo_at_smf_pulse (size_t smf_pulse) const;
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Tempo* tempo_at_seconds (double seconds) const;
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Tempo* nth_tempo (size_t n) const;
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private:
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smf_t* _smf;
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smf_track_t* _smf_track;
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bool _empty; ///< true iff file contains(non-empty) events
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mutable Glib::Threads::Mutex _smf_lock;
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bool _type0;
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std::set<uint8_t> _type0channels;
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};
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}; /* namespace Evoral */
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#endif /* EVORAL_SMF_HPP */
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