1 /* This file is part of Evoral.
2 * Copyright (C) 2008 David 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
24 #include "libsmf/smf.h"
25 #include "evoral/Event.hpp"
26 #include "evoral/SMF.hpp"
27 #include "evoral/midi_util.h"
28 #include "pbd/file_manager.h"
31 extern double round(double x);
48 SMF::num_tracks() const
50 return _smf->number_of_tracks;
59 /** Seek to the specified track (1-based indexing)
60 * \return 0 on success
63 SMF::seek_to_track(int track)
65 _smf_track = smf_get_track_by_number(_smf, track);
66 if (_smf_track != NULL) {
67 _smf_track->next_event_number = (_smf_track->number_of_events == 0) ? 0 : 1;
74 /** Attempt to open the SMF file for reading and/or writing.
76 * \return 0 on success
77 * -1 if the file can not be opened or created
78 * -2 if the file exists but specified track does not exist
81 SMF::open(const std::string& path, int track) THROW_FILE_ERROR
90 PBD::StdioFileDescriptor d (_file_path, "r");
91 FILE* f = d.allocate ();
96 if ((_smf = smf_load (f)) == 0) {
100 if ((_smf_track = smf_get_track_by_number(_smf, track)) == 0) {
104 //cerr << "Track " << track << " # events: " << _smf_track->number_of_events << endl;
105 if (_smf_track->number_of_events == 0) {
106 _smf_track->next_event_number = 0;
109 _smf_track->next_event_number = 1;
117 /** Attempt to create a new SMF file for reading and/or writing.
119 * \return 0 on success
120 * -1 if the file can not be created
121 * -2 if the track can not be created
124 SMF::create(const std::string& path, int track, uint16_t ppqn) THROW_FILE_ERROR
139 if (smf_set_ppqn(_smf, ppqn) != 0) {
143 for (int i = 0; i < track; ++i) {
144 _smf_track = smf_track_new();
146 smf_add_track(_smf, _smf_track);
149 _smf_track = smf_get_track_by_number(_smf, track);
153 _smf_track->next_event_number = 0;
156 /* put a stub file on disk */
158 PBD::StdioFileDescriptor d (_file_path, "w+");
159 FILE* f = d.allocate ();
164 if (smf_save (_smf, f)) {
175 SMF::close() THROW_FILE_ERROR
185 SMF::seek_to_start() const
187 _smf_track->next_event_number = 1;
190 /** Read an event from the current position in file.
192 * File position MUST be at the beginning of a delta time, or this will die very messily.
193 * ev.buffer must be of size ev.size, and large enough for the event. The returned event
194 * will have it's time field set to it's delta time, in SMF tempo-based ticks, using the
195 * rate given by ppqn() (it is the caller's responsibility to calculate a real time).
197 * \a buf must be a pointer to a buffer allocated with malloc, or a pointer to NULL.
198 * \a size must be the capacity of \a buf. If it is not large enough, \a buf will
199 * be reallocated and *size will be set to the new size of buf.
201 * if the event is a meta-event and is an Evoral Note ID, then \a note_id will be set
202 * to the value of the NoteID; otherwise, meta-events will set \a note_id to -1.
204 * \return event length (including status byte) on success, 0 if event was
205 * a meta event, or -1 on EOF (or end of track).
208 SMF::read_event(uint32_t* delta_t, uint32_t* size, uint8_t** buf, event_id_t* note_id) const
217 if ((event = smf_track_get_next_event(_smf_track)) != NULL) {
219 *delta_t = event->delta_time_pulses;
221 if (smf_event_is_metadata(event)) {
222 *note_id = -1; // "no note id in this meta-event */
224 if (event->midi_buffer[1] == 0x7f) { // Sequencer-specific
229 if (smf_extract_vlq (&event->midi_buffer[2], event->midi_buffer_length-2, &evsize, &lenlen) == 0) {
231 if (event->midi_buffer[2+lenlen] == 0x99 && // Evoral
232 event->midi_buffer[3+lenlen] == 0x1) { // Evoral Note ID
237 if (smf_extract_vlq (&event->midi_buffer[4+lenlen], event->midi_buffer_length-(4+lenlen), &id, &idlen) == 0) {
243 return 0; /* this is a meta-event */
246 int event_size = event->midi_buffer_length;
247 assert(event_size > 0);
249 // Make sure we have enough scratch buffer
250 if (*size < (unsigned)event_size) {
251 *buf = (uint8_t*)realloc(*buf, event_size);
253 memcpy(*buf, event->midi_buffer, size_t(event_size));
256 assert(midi_event_is_valid(*buf, *size));
258 /* printf("SMF::read_event @ %u: ", *delta_t);
259 for (size_t i = 0; i < *size; ++i) {
260 printf("%X ", (*buf)[i]);
270 SMF::append_event_delta(uint32_t delta_t, uint32_t size, const uint8_t* buf, event_id_t note_id)
276 /* printf("SMF::append_event_delta @ %u:", delta_t);
277 for (size_t i = 0; i < size; ++i) {
278 printf("%X ", buf[i]);
281 if (!midi_event_is_valid(buf, size)) {
282 cerr << "WARNING: SMF ignoring illegal MIDI event" << endl;
288 /* XXX july 2010: currently only store event ID's for notes, program changes and bank changes
291 uint8_t const c = buf[0] & 0xf0;
292 bool const store_id = (
293 c == MIDI_CMD_NOTE_ON ||
294 c == MIDI_CMD_NOTE_OFF ||
295 c == MIDI_CMD_PGM_CHANGE ||
296 (c == MIDI_CMD_CONTROL && (buf[1] == MIDI_CTL_MSB_BANK || buf[1] == MIDI_CTL_LSB_BANK))
299 if (store_id && note_id >= 0) {
305 event = smf_event_new ();
306 assert(event != NULL);
308 /* generate VLQ representation of note ID */
309 idlen = smf_format_vlq (idbuf, sizeof(idbuf), note_id);
311 /* generate VLQ representation of meta event length,
312 which is the idlen + 2 bytes (Evoral type ID plus Note ID type)
315 lenlen = smf_format_vlq (lenbuf, sizeof(lenbuf), idlen+2);
317 event->midi_buffer_length = 2 + lenlen + 2 + idlen;
318 /* this should be allocated by malloc(3) because libsmf will
321 event->midi_buffer = (uint8_t*) malloc (sizeof (uint8_t*) * event->midi_buffer_length);
323 event->midi_buffer[0] = 0xff; // Meta-event
324 event->midi_buffer[1] = 0x7f; // Sequencer-specific
325 memcpy (&event->midi_buffer[2], lenbuf, lenlen);
326 event->midi_buffer[2+lenlen] = 0x99; // Evoral type ID
327 event->midi_buffer[3+lenlen] = 0x1; // Evoral type Note ID
328 memcpy (&event->midi_buffer[4+lenlen], idbuf, idlen);
331 smf_track_add_event_delta_pulses(_smf_track, event, 0);
334 event = smf_event_new_from_pointer(buf, size);
335 assert(event != NULL);
338 smf_track_add_event_delta_pulses(_smf_track, event, delta_t);
346 smf_track_delete(_smf_track);
348 _smf_track = smf_track_new();
351 smf_add_track(_smf, _smf_track);
352 assert(_smf->number_of_tracks == 1);
356 SMF::end_write() THROW_FILE_ERROR
358 PBD::StdioFileDescriptor d (_file_path, "w+");
359 FILE* f = d.allocate ();
361 throw FileError (_file_path);
364 if (smf_save(_smf, f) != 0) {
365 throw FileError (_file_path);
370 SMF::round_to_file_precision (double val) const
374 return round (val * div) / div;
378 SMF::set_path (const std::string& p)
383 } // namespace Evoral