2 * Copyright (c) 2007, 2008 Edward Tomasz NapieraĆa <trasz@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * ALTHOUGH THIS SOFTWARE IS MADE OF WIN AND SCIENCE, IT IS PROVIDED BY THE
15 * AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
16 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
17 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
18 * THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
19 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
20 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
21 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
23 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
24 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 /* Reference: http://www.borg.com/~jglatt/tech/midifile.htm */
42 #include <arpa/inet.h>
44 #include "smf_private.h"
47 * Allocates new smf_t structure.
48 * \return pointer to smf_t or NULL.
55 smf_t *smf = malloc(sizeof(smf_t));
57 g_critical("Cannot allocate smf_t structure: %s", strerror(errno));
61 memset(smf, 0, sizeof(smf_t));
63 smf->tracks_array = g_ptr_array_new();
64 assert(smf->tracks_array);
66 smf->tempo_array = g_ptr_array_new();
67 assert(smf->tempo_array);
69 cantfail = smf_set_ppqn(smf, 120);
72 cantfail = smf_set_format(smf, 0);
81 * Frees smf and all it's descendant structures.
84 smf_delete(smf_t *smf)
86 /* Remove all the tracks, from last to first. */
87 while (smf->tracks_array->len > 0)
88 smf_track_delete(g_ptr_array_index(smf->tracks_array, smf->tracks_array->len - 1));
92 assert(smf->tracks_array->len == 0);
93 assert(smf->number_of_tracks == 0);
94 g_ptr_array_free(smf->tracks_array, TRUE);
95 g_ptr_array_free(smf->tempo_array, TRUE);
97 memset(smf, 0, sizeof(smf_t));
102 * Allocates new smf_track_t structure.
103 * \return pointer to smf_track_t or NULL.
108 smf_track_t *track = malloc(sizeof(smf_track_t));
110 g_critical("Cannot allocate smf_track_t structure: %s", strerror(errno));
114 memset(track, 0, sizeof(smf_track_t));
115 track->next_event_number = 0;
117 track->events_array = g_ptr_array_new();
118 assert(track->events_array);
124 * Detaches track from its smf and frees it.
127 smf_track_delete(smf_track_t *track)
130 assert(track->events_array);
132 /* Remove all the events, from last to first. */
133 while (track->events_array->len > 0)
134 smf_event_delete(g_ptr_array_index(track->events_array, track->events_array->len - 1));
137 smf_track_remove_from_smf(track);
139 assert(track->events_array->len == 0);
140 assert(track->number_of_events == 0);
141 g_ptr_array_free(track->events_array, TRUE);
143 memset(track, 0, sizeof(smf_track_t));
149 * Appends smf_track_t to smf.
152 smf_add_track(smf_t *smf, smf_track_t *track)
156 assert(track->smf == NULL);
159 g_ptr_array_add(smf->tracks_array, track);
161 smf->number_of_tracks++;
162 track->track_number = smf->number_of_tracks;
164 if (smf->number_of_tracks > 1) {
165 cantfail = smf_set_format(smf, 1);
171 * Detaches track from the smf.
174 smf_track_remove_from_smf(smf_track_t *track)
181 assert(track->smf != NULL);
183 track->smf->number_of_tracks--;
185 assert(track->smf->tracks_array);
186 g_ptr_array_remove(track->smf->tracks_array, track);
188 /* Renumber the rest of the tracks, so they are consecutively numbered. */
189 for (i = track->track_number; i <= track->smf->number_of_tracks; i++) {
190 tmp = smf_get_track_by_number(track->smf, i);
191 tmp->track_number = i;
194 * Events have track numbers too. I guess this wasn't a wise
197 for (j = 1; j <= tmp->number_of_events; j++) {
198 ev = smf_track_get_event_by_number(tmp, j);
199 ev->track_number = i;
203 track->track_number = -1;
208 * Allocates new smf_event_t structure. The caller is responsible for allocating
209 * event->midi_buffer, filling it with MIDI data and setting event->midi_buffer_length properly.
210 * Note that event->midi_buffer will be freed by smf_event_delete.
211 * \return pointer to smf_event_t or NULL.
216 smf_event_t *event = malloc(sizeof(smf_event_t));
218 g_critical("Cannot allocate smf_event_t structure: %s", strerror(errno));
222 memset(event, 0, sizeof(smf_event_t));
224 event->delta_time_pulses = -1;
225 event->time_pulses = -1;
226 event->time_seconds = -1.0;
227 event->track_number = -1;
233 * Allocates an smf_event_t structure and fills it with "len" bytes copied
235 * \param midi_data Pointer to MIDI data. It sill be copied to the newly allocated event->midi_buffer.
236 * \param len Length of the buffer. It must be proper MIDI event length, e.g. 3 for Note On event.
237 * \return Event containing MIDI data or NULL.
240 smf_event_new_from_pointer(const void *midi_data, size_t len)
244 event = smf_event_new();
248 event->midi_buffer_length = len;
249 event->midi_buffer = malloc(event->midi_buffer_length);
250 if (event->midi_buffer == NULL) {
251 g_critical("Cannot allocate MIDI buffer structure: %s", strerror(errno));
252 smf_event_delete(event);
257 memcpy(event->midi_buffer, midi_data, len);
263 * Allocates an smf_event_t structure and fills it with at most three bytes of data.
264 * For example, if you need to create Note On event, do something like this:
266 * smf_event_new_from_bytes(0x90, 0x3C, 0x7f);
268 * To create event for MIDI message that is shorter than three bytes, do something
271 * smf_event_new_from_bytes(0xC0, 0x42, -1);
273 * \param first_byte First byte of MIDI message. Must be valid status byte.
274 * \param second_byte Second byte of MIDI message or -1, if message is one byte long.
275 * \param third_byte Third byte of MIDI message or -1, if message is two bytes long.
276 * \return Event containing MIDI data or NULL.
279 smf_event_new_from_bytes(int first_byte, int second_byte, int third_byte)
285 event = smf_event_new();
289 if (first_byte < 0) {
290 g_critical("First byte of MIDI message cannot be < 0");
291 smf_event_delete(event);
296 if (first_byte > 255) {
297 g_critical("smf_event_new_from_bytes: first byte is %d, which is larger than 255.", first_byte);
301 if (!is_status_byte(first_byte)) {
302 g_critical("smf_event_new_from_bytes: first byte is not a valid status byte.");
309 else if (third_byte < 0)
315 if (second_byte > 255) {
316 g_critical("smf_event_new_from_bytes: second byte is %d, which is larger than 255.", second_byte);
320 if (is_status_byte(second_byte)) {
321 g_critical("smf_event_new_from_bytes: second byte cannot be a status byte.");
327 if (third_byte > 255) {
328 g_critical("smf_event_new_from_bytes: third byte is %d, which is larger than 255.", third_byte);
332 if (is_status_byte(third_byte)) {
333 g_critical("smf_event_new_from_bytes: third byte cannot be a status byte.");
338 event->midi_buffer_length = len;
339 event->midi_buffer = malloc(event->midi_buffer_length);
340 if (event->midi_buffer == NULL) {
341 g_critical("Cannot allocate MIDI buffer structure: %s", strerror(errno));
342 smf_event_delete(event);
347 event->midi_buffer[0] = first_byte;
349 event->midi_buffer[1] = second_byte;
351 event->midi_buffer[2] = third_byte;
357 * Detaches event from its track and frees it.
360 smf_event_delete(smf_event_t *event)
362 if (event->track != NULL)
363 smf_event_remove_from_track(event);
365 if (event->midi_buffer != NULL) {
366 memset(event->midi_buffer, 0, event->midi_buffer_length);
367 free(event->midi_buffer);
370 memset(event, 0, sizeof(smf_event_t));
375 * Used for sorting track->events_array.
378 events_array_compare_function(gconstpointer aa, gconstpointer bb)
382 /* "The comparison function for g_ptr_array_sort() doesn't take the pointers
383 from the array as arguments, it takes pointers to the pointers in the array." */
384 a = (smf_event_t *)*(gpointer *)aa;
385 b = (smf_event_t *)*(gpointer *)bb;
387 if (a->time_pulses < b->time_pulses)
390 if (a->time_pulses > b->time_pulses)
394 * We need to preserve original order, otherwise things will break
395 * when there are several events with the same ->time_pulses.
396 * XXX: This is an ugly hack; we should remove sorting altogether.
399 if (a->event_number < b->event_number)
402 if (a->event_number > b->event_number)
409 * An assumption here is that if there is an EOT event, it will be at the end of the track.
412 remove_eot_if_before_pulses(smf_track_t *track, size_t pulses)
416 event = smf_track_get_last_event(track);
421 if (!smf_event_is_eot(event))
424 if (event->time_pulses > pulses)
427 smf_event_remove_from_track(event);
431 * Adds the event to the track and computes ->delta_pulses. Note that it is faster
432 * to append events to the end of the track than to insert them in the middle.
433 * Usually you want to use smf_track_add_event_seconds or smf_track_add_event_pulses
434 * instead of this one. Event needs to have ->time_pulses and ->time_seconds already set.
435 * If you try to add event after an EOT, EOT event will be automatically deleted.
438 smf_track_add_event(smf_track_t *track, smf_event_t *event)
440 size_t i, last_pulses = 0;
442 assert(track->smf != NULL);
443 assert(event->track == NULL);
444 assert(event->delta_time_pulses == -1);
445 assert(event->time_seconds >= 0.0);
447 remove_eot_if_before_pulses(track, event->time_pulses);
449 event->track = track;
450 event->track_number = track->track_number;
452 if (track->number_of_events == 0) {
453 assert(track->next_event_number == 0);
454 track->next_event_number = 1;
457 if (track->number_of_events > 0)
458 last_pulses = smf_track_get_last_event(track)->time_pulses;
460 track->number_of_events++;
462 /* Are we just appending element at the end of the track? */
463 if (last_pulses <= event->time_pulses) {
464 event->delta_time_pulses = event->time_pulses - last_pulses;
465 assert(event->delta_time_pulses >= 0);
466 g_ptr_array_add(track->events_array, event);
467 event->event_number = track->number_of_events;
469 /* We need to insert in the middle of the track. XXX: This is slow. */
471 /* Append, then sort according to ->time_pulses. */
472 g_ptr_array_add(track->events_array, event);
473 g_ptr_array_sort(track->events_array, events_array_compare_function);
475 /* Renumber entries and fix their ->delta_pulses. */
476 for (i = 1; i <= track->number_of_events; i++) {
477 smf_event_t *tmp = smf_track_get_event_by_number(track, i);
478 tmp->event_number = i;
480 if (tmp->delta_time_pulses != -1)
484 tmp->delta_time_pulses = tmp->time_pulses;
486 tmp->delta_time_pulses = tmp->time_pulses -
487 smf_track_get_event_by_number(track, i - 1)->time_pulses;
488 assert(tmp->delta_time_pulses >= 0);
492 /* Adjust ->delta_time_pulses of the next event. */
493 if (event->event_number < track->number_of_events) {
494 smf_event_t *next_event = smf_track_get_event_by_number(track, event->event_number + 1);
496 assert(next_event->time_pulses >= event->time_pulses);
497 next_event->delta_time_pulses -= event->delta_time_pulses;
498 assert(next_event->delta_time_pulses >= 0);
502 if (smf_event_is_tempo_change_or_time_signature(event)) {
503 if (smf_event_is_last(event))
504 maybe_add_to_tempo_map(event);
506 smf_create_tempo_map_and_compute_seconds(event->track->smf);
511 * Add End Of Track metaevent. Using it is optional, libsmf will automatically
512 * add EOT to the tracks during smf_save, with delta_pulses 0. If you try to add EOT
513 * in the middle of the track, it will fail and nonzero value will be returned.
514 * If you try to add EOT after another EOT event, it will be added, but the existing
515 * EOT event will be removed.
517 * \return 0 if everything went ok, nonzero otherwise.
520 smf_track_add_eot_delta_pulses(smf_track_t *track, uint32_t delta)
524 event = smf_event_new_from_bytes(0xFF, 0x2F, 0x00);
528 smf_track_add_event_delta_pulses(track, event, delta);
534 smf_track_add_eot_pulses(smf_track_t *track, size_t pulses)
536 smf_event_t *event, *last_event;
538 last_event = smf_track_get_last_event(track);
539 if (last_event != NULL) {
540 if (last_event->time_pulses > pulses)
544 event = smf_event_new_from_bytes(0xFF, 0x2F, 0x00);
548 smf_track_add_event_pulses(track, event, pulses);
554 smf_track_add_eot_seconds(smf_track_t *track, double seconds)
556 smf_event_t *event, *last_event;
558 last_event = smf_track_get_last_event(track);
559 if (last_event != NULL) {
560 if (last_event->time_seconds > seconds)
564 event = smf_event_new_from_bytes(0xFF, 0x2F, 0x00);
568 smf_track_add_event_seconds(track, event, seconds);
574 * Detaches event from its track.
577 smf_event_remove_from_track(smf_event_t *event)
584 assert(event->track != NULL);
585 assert(event->track->smf != NULL);
587 track = event->track;
588 was_last = smf_event_is_last(event);
590 /* Adjust ->delta_time_pulses of the next event. */
591 if (event->event_number < track->number_of_events) {
592 tmp = smf_track_get_event_by_number(track, event->event_number + 1);
594 tmp->delta_time_pulses += event->delta_time_pulses;
597 track->number_of_events--;
598 g_ptr_array_remove(track->events_array, event);
600 if (track->number_of_events == 0)
601 track->next_event_number = 0;
603 /* Renumber the rest of the events, so they are consecutively numbered. */
604 for (i = event->event_number; i <= track->number_of_events; i++) {
605 tmp = smf_track_get_event_by_number(track, i);
606 tmp->event_number = i;
609 if (smf_event_is_tempo_change_or_time_signature(event)) {
610 /* XXX: This will cause problems, when there is more than one Tempo Change event at a given time. */
612 remove_last_tempo_with_pulses(event->track->smf, event->time_pulses);
614 smf_create_tempo_map_and_compute_seconds(track->smf);
618 event->event_number = 0;
619 event->delta_time_pulses = -1;
620 event->time_pulses = 0;
621 event->time_seconds = -1.0;
625 * \return Nonzero if event is Tempo Change or Time Signature metaevent.
628 smf_event_is_tempo_change_or_time_signature(const smf_event_t *event)
630 if (!smf_event_is_metadata(event))
633 assert(event->midi_buffer_length >= 2);
635 if (event->midi_buffer[1] == 0x51 || event->midi_buffer[1] == 0x58)
642 * Sets "Format" field of MThd header to the specified value. Note that you
643 * don't really need to use this, as libsmf will automatically change format
644 * from 0 to 1 when you add the second track.
646 * \param format 0 for one track per file, 1 for several tracks per file.
649 smf_set_format(smf_t *smf, int format)
651 assert(format == 0 || format == 1);
653 if (smf->number_of_tracks > 1 && format == 0) {
654 g_critical("There is more than one track, cannot set format to 0.");
658 smf->format = format;
664 * Sets the PPQN ("Division") field of MThd header. This is mandatory, you
665 * should call it right after smf_new. Note that changing PPQN will change time_seconds
668 * \param ppqn New PPQN.
671 smf_set_ppqn(smf_t *smf, uint16_t ppqn)
679 * Returns next event from the track given and advances next event counter.
680 * Do not depend on End Of Track event being the last event on the track - it
681 * is possible that the track will not end with EOT if you haven't added it
682 * yet. EOTs are added automatically during smf_save().
684 * \return Event or NULL, if there are no more events left in this track.
687 smf_track_get_next_event(smf_track_t *track)
689 smf_event_t *event, *next_event;
691 /* Track is empty? */
692 if (track->number_of_events == 0)
696 if (track->next_event_number == 0)
699 assert(track->next_event_number >= 1);
701 event = smf_track_get_event_by_number(track, track->next_event_number);
703 assert(event != NULL);
705 /* Is this the last event in the track? */
706 if (track->next_event_number < track->number_of_events) {
707 next_event = smf_track_get_event_by_number(track, track->next_event_number + 1);
710 track->time_of_next_event = next_event->time_pulses;
711 track->next_event_number++;
713 track->next_event_number = 0;
720 * Returns next event from the track given. Does not change next event counter,
721 * so repeatedly calling this routine will return the same event.
722 * \return Event or NULL, if there are no more events left in this track.
725 smf_peek_next_event_from_track(smf_track_t *track)
730 if (track->next_event_number == 0)
733 assert(track->next_event_number >= 1);
734 assert(track->events_array->len != 0);
736 event = smf_track_get_event_by_number(track, track->next_event_number);
742 * \return Track with a given number or NULL, if there is no such track.
743 * Tracks are numbered consecutively starting from one.
746 smf_get_track_by_number(const smf_t *smf, int track_number)
750 assert(track_number >= 1);
752 if (track_number > smf->number_of_tracks)
755 track = (smf_track_t *)g_ptr_array_index(smf->tracks_array, track_number - 1);
763 * \return Event with a given number or NULL, if there is no such event.
764 * Events are numbered consecutively starting from one.
767 smf_track_get_event_by_number(const smf_track_t *track, size_t event_number)
771 assert(event_number >= 1);
773 if (event_number > track->number_of_events)
776 event = g_ptr_array_index(track->events_array, event_number - 1);
784 * \return Last event on the track or NULL, if track is empty.
787 smf_track_get_last_event(const smf_track_t *track)
791 if (track->number_of_events == 0)
794 event = smf_track_get_event_by_number(track, track->number_of_events);
800 * Searches for track that contains next event, in time order. In other words,
801 * returns the track that contains event that should be played next.
802 * \return Track with next event or NULL, if there are no events left.
805 smf_find_track_with_next_event(smf_t *smf)
809 smf_track_t *track = NULL, *min_time_track = NULL;
811 /* Find track with event that should be played next. */
812 for (i = 1; i <= smf->number_of_tracks; i++) {
813 track = smf_get_track_by_number(smf, i);
817 /* No more events in this track? */
818 if (track->next_event_number == 0)
821 if (track->time_of_next_event < min_time || min_time_track == NULL) {
822 min_time = track->time_of_next_event;
823 min_time_track = track;
827 return (min_time_track);
831 * \return Next event, in time order, or NULL, if there are none left.
834 smf_get_next_event(smf_t *smf)
837 smf_track_t *track = smf_find_track_with_next_event(smf);
841 g_debug("End of the song.");
847 event = smf_track_get_next_event(track);
849 assert(event != NULL);
851 event->track->smf->last_seek_position = -1.0;
857 * Advance the "next event counter". This is functionally the same as calling
858 * smf_get_next_event and ignoring the return value.
861 smf_skip_next_event(smf_t *smf)
865 notused = smf_get_next_event(smf);
869 * \return Next event, in time order, or NULL, if there are none left. Does
870 * not advance position in song.
873 smf_peek_next_event(smf_t *smf)
876 smf_track_t *track = smf_find_track_with_next_event(smf);
880 g_debug("End of the song.");
886 event = smf_peek_next_event_from_track(track);
888 assert(event != NULL);
894 * Rewinds the SMF. What that means is, after calling this routine, smf_get_next_event
895 * will return first event in the song.
898 smf_rewind(smf_t *smf)
901 smf_track_t *track = NULL;
906 smf->last_seek_position = 0.0;
908 for (i = 1; i <= smf->number_of_tracks; i++) {
909 track = smf_get_track_by_number(smf, i);
911 assert(track != NULL);
913 if (track->number_of_events > 0) {
914 track->next_event_number = 1;
915 event = smf_peek_next_event_from_track(track);
917 track->time_of_next_event = event->time_pulses;
919 track->next_event_number = 0;
920 track->time_of_next_event = 0;
922 g_warning("Warning: empty track.");
929 * Seeks the SMF to the given event. After calling this routine, smf_get_next_event
930 * will return the event that was the second argument of this call.
933 smf_seek_to_event(smf_t *smf, const smf_event_t *target)
940 g_debug("Seeking to event %d, track %d.", target->event_number, target->track->track_number);
944 event = smf_peek_next_event(smf);
946 /* There can't be NULL here, unless "target" is not in this smf. */
950 smf_skip_next_event(smf);
955 smf->last_seek_position = event->time_seconds;
961 * Seeks the SMF to the given position. For example, after seeking to 1.0 seconds,
962 * smf_get_next_event will return first event that happens after the first second of song.
965 smf_seek_to_seconds(smf_t *smf, double seconds)
969 assert(seconds >= 0.0);
971 if (seconds == smf->last_seek_position) {
973 g_debug("Avoiding seek to %f seconds.", seconds);
981 g_debug("Seeking to %f seconds.", seconds);
985 event = smf_peek_next_event(smf);
988 g_critical("Trying to seek past the end of song.");
992 if (event->time_seconds < seconds)
993 smf_skip_next_event(smf);
998 smf->last_seek_position = seconds;
1004 * Seeks the SMF to the given position. For example, after seeking to 10 pulses,
1005 * smf_get_next_event will return first event that happens after the first ten pulses.
1008 smf_seek_to_pulses(smf_t *smf, size_t pulses)
1015 g_debug("Seeking to %d pulses.", pulses);
1019 event = smf_peek_next_event(smf);
1021 if (event == NULL) {
1022 g_critical("Trying to seek past the end of song.");
1026 if (event->time_pulses < pulses)
1027 smf_skip_next_event(smf);
1032 smf->last_seek_position = event->time_seconds;
1038 * \return Length of SMF, in pulses.
1041 smf_get_length_pulses(const smf_t *smf)
1046 for (i = 1; i <= smf->number_of_tracks; i++) {
1050 track = smf_get_track_by_number(smf, i);
1053 event = smf_track_get_last_event(track);
1058 if (event->time_pulses > pulses)
1059 pulses = event->time_pulses;
1066 * \return Length of SMF, in seconds.
1069 smf_get_length_seconds(const smf_t *smf)
1072 double seconds = 0.0;
1074 for (i = 1; i <= smf->number_of_tracks; i++) {
1078 track = smf_get_track_by_number(smf, i);
1081 event = smf_track_get_last_event(track);
1086 if (event->time_seconds > seconds)
1087 seconds = event->time_seconds;
1094 * \return Nonzero, if there are no events in the SMF after this one.
1095 * Note that may be more than one "last event", if they occur at the same time.
1098 smf_event_is_last(const smf_event_t *event)
1100 if (smf_get_length_pulses(event->track->smf) <= event->time_pulses)
1107 * \return Version of libsmf.
1110 smf_get_version(void)
1112 return (SMF_VERSION);