1 /* This file is part of Evoral.
2 * Copyright (C) 2008 Dave Robillard <http://drobilla.net>
3 * Copyright (C) 2000-2008 Paul Davis
6 * Evoral is free software; you can redistribute it and/or modify it under the
7 * terms of the GNU General Public License as published by the Free Software
8 * Foundation; either version 2 of the License, or (at your option) any later
11 * Evoral is distributed in the hope that it will be useful, but WITHOUT ANY
12 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
13 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for details.
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 #define __STDC_LIMIT_MACROS 1
25 #include "libsmf/smf.h"
26 #include "evoral/Event.hpp"
27 #include "evoral/SMF.hpp"
28 #include "evoral/midi_util.h"
44 SMF::num_tracks() const
46 return _smf->number_of_tracks;
55 /** Seek to the specified track (1-based indexing)
56 * \return 0 on success
59 SMF::seek_to_track(int track)
61 _smf_track = smf_get_track_by_number(_smf, track);
62 if (_smf_track != NULL) {
63 _smf_track->next_event_number = (_smf_track->number_of_events == 0) ? 0 : 1;
70 /** Attempt to open the SMF file for reading and/or writing.
72 * \return 0 on success
73 * -1 if the file can not be opened or created
74 * -2 if the file exists but specified track does not exist
77 SMF::open(const std::string& path, int track) THROW_FILE_ERROR
85 _smf = smf_load(_file_path.c_str());
90 _smf_track = smf_get_track_by_number(_smf, track);
94 //cerr << "Track " << track << " # events: " << _smf_track->number_of_events << endl;
95 if (_smf_track->number_of_events == 0) {
96 _smf_track->next_event_number = 0;
99 _smf_track->next_event_number = 1;
107 /** Attempt to create a new SMF file for reading and/or writing.
109 * \return 0 on success
110 * -1 if the file can not be created
111 * -2 if the track can not be created
114 SMF::create(const std::string& path, int track, uint16_t ppqn) THROW_FILE_ERROR
124 if (smf_set_ppqn(_smf, ppqn) != 0) {
132 for (int i = 0; i < track; ++i) {
133 _smf_track = smf_track_new();
135 smf_add_track(_smf, _smf_track);
138 _smf_track = smf_get_track_by_number(_smf, track);
142 _smf_track->next_event_number = 0;
149 SMF::close() THROW_FILE_ERROR
152 if (smf_save(_smf, _file_path.c_str()) != 0) {
162 SMF::seek_to_start() const
164 _smf_track->next_event_number = 1;
167 /** Read an event from the current position in file.
169 * File position MUST be at the beginning of a delta time, or this will die very messily.
170 * ev.buffer must be of size ev.size, and large enough for the event. The returned event
171 * will have it's time field set to it's delta time, in SMF tempo-based ticks, using the
172 * rate given by ppqn() (it is the caller's responsibility to calculate a real time).
174 * \a buf must be a pointer to a buffer allocated with malloc, or a pointer to NULL.
175 * \a size must be the capacity of \a buf. If it is not large enough, \a buf will
176 * be reallocated and *size will be set to the new size of buf.
178 * \return event length (including status byte) on success, 0 if event was
179 * skipped (e.g. a meta event), or -1 on EOF (or end of track).
182 SMF::read_event(uint32_t* delta_t, uint32_t* size, uint8_t** buf) const
190 if ((event = smf_track_get_next_event(_smf_track)) != NULL) {
191 if (smf_event_is_metadata(event)) {
194 *delta_t = event->delta_time_pulses;
196 int event_size = event->midi_buffer_length;
197 assert(event_size > 0);
199 // Make sure we have enough scratch buffer
200 if (*size < (unsigned)event_size) {
201 *buf = (uint8_t*)realloc(*buf, event_size);
203 memcpy(*buf, event->midi_buffer, size_t(event_size));
206 assert(midi_event_is_valid(*buf, *size));
208 /*printf("SMF::read_event:\n");
209 for (size_t i = 0; i < *size; ++i) {
210 printf("%X ", (*buf)[i]);
220 SMF::append_event_delta(uint32_t delta_t, uint32_t size, const uint8_t* buf)
226 /*printf("SMF::append_event_delta:\n");
227 for (size_t i = 0; i < size; ++i) {
228 printf("%X ", buf[i]);
231 if (!midi_event_is_valid(buf, size)) {
232 cerr << "WARNING: SMF ignoring illegal MIDI event" << endl;
238 event = smf_event_new_from_pointer(buf, size);
239 assert(event != NULL);
242 smf_track_add_event_delta_pulses(_smf_track, event, delta_t);
250 smf_track_delete(_smf_track);
252 _smf_track = smf_track_new();
255 smf_add_track(_smf, _smf_track);
256 assert(_smf->number_of_tracks == 1);
260 SMF::end_write() THROW_FILE_ERROR
262 if (smf_save(_smf, _file_path.c_str()) != 0)
267 SMF::round_to_file_precision (double val) const
271 return round (val * div) / div;
275 } // namespace Evoral