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 = -1;
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)
180 assert(track->smf != NULL);
182 track->smf->number_of_tracks--;
184 assert(track->smf->tracks_array);
185 g_ptr_array_remove(track->smf->tracks_array, track);
187 /* Renumber the rest of the tracks, so they are consecutively numbered. */
188 for (i = track->track_number; i <= track->smf->number_of_tracks; i++) {
189 tmp = smf_get_track_by_number(track->smf, i);
190 tmp->track_number = i;
193 * Events have track numbers too. I guess this wasn't a wise
196 for (j = 1; j <= tmp->number_of_events; j++) {
197 ev = smf_track_get_event_by_number(tmp, j);
198 ev->track_number = i;
202 track->track_number = -1;
207 * Allocates new smf_event_t structure. The caller is responsible for allocating
208 * event->midi_buffer, filling it with MIDI data and setting event->midi_buffer_length properly.
209 * Note that event->midi_buffer will be freed by smf_event_delete.
210 * \return pointer to smf_event_t or NULL.
215 smf_event_t *event = malloc(sizeof(smf_event_t));
217 g_critical("Cannot allocate smf_event_t structure: %s", strerror(errno));
221 memset(event, 0, sizeof(smf_event_t));
223 event->delta_time_pulses = -1;
224 event->time_pulses = -1;
225 event->time_seconds = -1.0;
226 event->track_number = -1;
232 * Allocates an smf_event_t structure and fills it with "len" bytes copied
234 * \param midi_data Pointer to MIDI data. It sill be copied to the newly allocated event->midi_buffer.
235 * \param len Length of the buffer. It must be proper MIDI event length, e.g. 3 for Note On event.
236 * \return Event containing MIDI data or NULL.
239 smf_event_new_from_pointer(void *midi_data, int len)
243 event = smf_event_new();
247 event->midi_buffer_length = len;
248 event->midi_buffer = malloc(event->midi_buffer_length);
249 if (event->midi_buffer == NULL) {
250 g_critical("Cannot allocate MIDI buffer structure: %s", strerror(errno));
251 smf_event_delete(event);
256 memcpy(event->midi_buffer, midi_data, len);
262 * Allocates an smf_event_t structure and fills it with at most three bytes of data.
263 * For example, if you need to create Note On event, do something like this:
265 * smf_event_new_from_bytes(0x90, 0x3C, 0x7f);
267 * To create event for MIDI message that is shorter than three bytes, do something
270 * smf_event_new_from_bytes(0xC0, 0x42, -1);
272 * \param first_byte First byte of MIDI message. Must be valid status byte.
273 * \param second_byte Second byte of MIDI message or -1, if message is one byte long.
274 * \param third_byte Third byte of MIDI message or -1, if message is two bytes long.
275 * \return Event containing MIDI data or NULL.
278 smf_event_new_from_bytes(int first_byte, int second_byte, int third_byte)
284 event = smf_event_new();
288 if (first_byte < 0) {
289 g_critical("First byte of MIDI message cannot be < 0");
290 smf_event_delete(event);
295 if (first_byte > 255) {
296 g_critical("smf_event_new_from_bytes: first byte is %d, which is larger than 255.", first_byte);
300 if (!is_status_byte(first_byte)) {
301 g_critical("smf_event_new_from_bytes: first byte is not a valid status byte.");
308 else if (third_byte < 0)
314 if (second_byte > 255) {
315 g_critical("smf_event_new_from_bytes: second byte is %d, which is larger than 255.", second_byte);
319 if (is_status_byte(second_byte)) {
320 g_critical("smf_event_new_from_bytes: second byte cannot be a status byte.");
326 if (third_byte > 255) {
327 g_critical("smf_event_new_from_bytes: third byte is %d, which is larger than 255.", third_byte);
331 if (is_status_byte(third_byte)) {
332 g_critical("smf_event_new_from_bytes: third byte cannot be a status byte.");
337 event->midi_buffer_length = len;
338 event->midi_buffer = malloc(event->midi_buffer_length);
339 if (event->midi_buffer == NULL) {
340 g_critical("Cannot allocate MIDI buffer structure: %s", strerror(errno));
341 smf_event_delete(event);
346 event->midi_buffer[0] = first_byte;
348 event->midi_buffer[1] = second_byte;
350 event->midi_buffer[2] = third_byte;
356 * Detaches event from its track and frees it.
359 smf_event_delete(smf_event_t *event)
361 if (event->track != NULL)
362 smf_event_remove_from_track(event);
364 if (event->midi_buffer != NULL) {
365 memset(event->midi_buffer, 0, event->midi_buffer_length);
366 free(event->midi_buffer);
369 memset(event, 0, sizeof(smf_event_t));
374 * Used for sorting track->events_array.
377 events_array_compare_function(gconstpointer aa, gconstpointer bb)
381 /* "The comparison function for g_ptr_array_sort() doesn't take the pointers
382 from the array as arguments, it takes pointers to the pointers in the array." */
383 a = (smf_event_t *)*(gpointer *)aa;
384 b = (smf_event_t *)*(gpointer *)bb;
386 if (a->time_pulses < b->time_pulses)
389 if (a->time_pulses > b->time_pulses)
393 * We need to preserve original order, otherwise things will break
394 * when there are several events with the same ->time_pulses.
395 * XXX: This is an ugly hack; we should remove sorting altogether.
398 if (a->event_number < b->event_number)
401 if (a->event_number > b->event_number)
408 * An assumption here is that if there is an EOT event, it will be at the end of the track.
411 remove_eot_if_before_pulses(smf_track_t *track, int pulses)
415 event = smf_track_get_last_event(track);
420 if (!smf_event_is_eot(event))
423 if (event->time_pulses > pulses)
426 smf_event_remove_from_track(event);
430 * Adds the event to the track and computes ->delta_pulses. Note that it is faster
431 * to append events to the end of the track than to insert them in the middle.
432 * Usually you want to use smf_track_add_event_seconds or smf_track_add_event_pulses
433 * instead of this one. Event needs to have ->time_pulses and ->time_seconds already set.
434 * If you try to add event after an EOT, EOT event will be automatically deleted.
437 smf_track_add_event(smf_track_t *track, smf_event_t *event)
439 int i, last_pulses = 0;
441 assert(track->smf != NULL);
442 assert(event->track == NULL);
443 assert(event->delta_time_pulses == -1);
444 assert(event->time_pulses >= 0);
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 == -1);
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, int 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, int 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)
583 assert(event->track != NULL);
584 assert(event->track->smf != NULL);
586 track = event->track;
587 was_last = smf_event_is_last(event);
589 /* Adjust ->delta_time_pulses of the next event. */
590 if (event->event_number < track->number_of_events) {
591 tmp = smf_track_get_event_by_number(track, event->event_number + 1);
593 tmp->delta_time_pulses += event->delta_time_pulses;
596 track->number_of_events--;
597 g_ptr_array_remove(track->events_array, event);
599 if (track->number_of_events == 0)
600 track->next_event_number = -1;
602 /* Renumber the rest of the events, so they are consecutively numbered. */
603 for (i = event->event_number; i <= track->number_of_events; i++) {
604 tmp = smf_track_get_event_by_number(track, i);
605 tmp->event_number = i;
608 if (smf_event_is_tempo_change_or_time_signature(event)) {
609 /* XXX: This will cause problems, when there is more than one Tempo Change event at a given time. */
611 remove_last_tempo_with_pulses(event->track->smf, event->time_pulses);
613 smf_create_tempo_map_and_compute_seconds(track->smf);
617 event->event_number = -1;
618 event->delta_time_pulses = -1;
619 event->time_pulses = -1;
620 event->time_seconds = -1.0;
624 * \return Nonzero if event is Tempo Change or Time Signature metaevent.
627 smf_event_is_tempo_change_or_time_signature(const smf_event_t *event)
629 if (!smf_event_is_metadata(event))
632 assert(event->midi_buffer_length >= 2);
634 if (event->midi_buffer[1] == 0x51 || event->midi_buffer[1] == 0x58)
641 * Sets "Format" field of MThd header to the specified value. Note that you
642 * don't really need to use this, as libsmf will automatically change format
643 * from 0 to 1 when you add the second track.
645 * \param format 0 for one track per file, 1 for several tracks per file.
648 smf_set_format(smf_t *smf, int format)
650 assert(format == 0 || format == 1);
652 if (smf->number_of_tracks > 1 && format == 0) {
653 g_critical("There is more than one track, cannot set format to 0.");
657 smf->format = format;
663 * Sets the PPQN ("Division") field of MThd header. This is mandatory, you
664 * should call it right after smf_new. Note that changing PPQN will change time_seconds
667 * \param ppqn New PPQN.
670 smf_set_ppqn(smf_t *smf, int ppqn)
680 * Returns next event from the track given and advances next event counter.
681 * Do not depend on End Of Track event being the last event on the track - it
682 * is possible that the track will not end with EOT if you haven't added it
683 * yet. EOTs are added automatically during smf_save().
685 * \return Event or NULL, if there are no more events left in this track.
688 smf_track_get_next_event(smf_track_t *track)
690 smf_event_t *event, *next_event;
693 if (track->next_event_number == -1)
696 assert(track->next_event_number >= 1);
697 assert(track->number_of_events > 0);
699 event = smf_track_get_event_by_number(track, track->next_event_number);
701 assert(event != NULL);
703 /* Is this the last event in the track? */
704 if (track->next_event_number < track->number_of_events) {
705 next_event = smf_track_get_event_by_number(track, track->next_event_number + 1);
708 track->time_of_next_event = next_event->time_pulses;
709 track->next_event_number++;
711 track->next_event_number = -1;
718 * Returns next event from the track given. Does not change next event counter,
719 * so repeatedly calling this routine will return the same event.
720 * \return Event or NULL, if there are no more events left in this track.
723 smf_peek_next_event_from_track(smf_track_t *track)
728 if (track->next_event_number == -1)
731 assert(track->next_event_number >= 1);
732 assert(track->events_array->len != 0);
734 event = smf_track_get_event_by_number(track, track->next_event_number);
740 * \return Track with a given number or NULL, if there is no such track.
741 * Tracks are numbered consecutively starting from one.
744 smf_get_track_by_number(const smf_t *smf, int track_number)
748 assert(track_number >= 1);
750 if (track_number > smf->number_of_tracks)
753 track = (smf_track_t *)g_ptr_array_index(smf->tracks_array, track_number - 1);
761 * \return Event with a given number or NULL, if there is no such event.
762 * Events are numbered consecutively starting from one.
765 smf_track_get_event_by_number(const smf_track_t *track, int event_number)
769 assert(event_number >= 1);
771 if (event_number > track->number_of_events)
774 event = g_ptr_array_index(track->events_array, event_number - 1);
782 * \return Last event on the track or NULL, if track is empty.
785 smf_track_get_last_event(const smf_track_t *track)
789 if (track->number_of_events == 0)
792 event = smf_track_get_event_by_number(track, track->number_of_events);
798 * Searches for track that contains next event, in time order. In other words,
799 * returns the track that contains event that should be played next.
800 * \return Track with next event or NULL, if there are no events left.
803 smf_find_track_with_next_event(smf_t *smf)
806 smf_track_t *track = NULL, *min_time_track = NULL;
808 /* Find track with event that should be played next. */
809 for (i = 1; i <= smf->number_of_tracks; i++) {
810 track = smf_get_track_by_number(smf, i);
814 /* No more events in this track? */
815 if (track->next_event_number == -1)
818 if (track->time_of_next_event < min_time || min_time_track == NULL) {
819 min_time = track->time_of_next_event;
820 min_time_track = track;
824 return (min_time_track);
828 * \return Next event, in time order, or NULL, if there are none left.
831 smf_get_next_event(smf_t *smf)
834 smf_track_t *track = smf_find_track_with_next_event(smf);
838 g_debug("End of the song.");
844 event = smf_track_get_next_event(track);
846 assert(event != NULL);
848 event->track->smf->last_seek_position = -1.0;
854 * Advance the "next event counter". This is functionally the same as calling
855 * smf_get_next_event and ignoring the return value.
858 smf_skip_next_event(smf_t *smf)
862 notused = smf_get_next_event(smf);
866 * \return Next event, in time order, or NULL, if there are none left. Does
867 * not advance position in song.
870 smf_peek_next_event(smf_t *smf)
873 smf_track_t *track = smf_find_track_with_next_event(smf);
877 g_debug("End of the song.");
883 event = smf_peek_next_event_from_track(track);
885 assert(event != NULL);
891 * Rewinds the SMF. What that means is, after calling this routine, smf_get_next_event
892 * will return first event in the song.
895 smf_rewind(smf_t *smf)
898 smf_track_t *track = NULL;
903 smf->last_seek_position = 0.0;
905 for (i = 1; i <= smf->number_of_tracks; i++) {
906 track = smf_get_track_by_number(smf, i);
908 assert(track != NULL);
910 if (track->number_of_events > 0) {
911 track->next_event_number = 1;
912 event = smf_peek_next_event_from_track(track);
914 track->time_of_next_event = event->time_pulses;
916 track->next_event_number = -1;
917 track->time_of_next_event = 0;
919 g_warning("Warning: empty track.");
926 * Seeks the SMF to the given event. After calling this routine, smf_get_next_event
927 * will return the event that was the second argument of this call.
930 smf_seek_to_event(smf_t *smf, const smf_event_t *target)
937 g_debug("Seeking to event %d, track %d.", target->event_number, target->track->track_number);
941 event = smf_peek_next_event(smf);
943 /* There can't be NULL here, unless "target" is not in this smf. */
947 smf_skip_next_event(smf);
952 smf->last_seek_position = event->time_seconds;
958 * Seeks the SMF to the given position. For example, after seeking to 1.0 seconds,
959 * smf_get_next_event will return first event that happens after the first second of song.
962 smf_seek_to_seconds(smf_t *smf, double seconds)
966 assert(seconds >= 0.0);
968 if (seconds == smf->last_seek_position) {
970 g_debug("Avoiding seek to %f seconds.", seconds);
978 g_debug("Seeking to %f seconds.", seconds);
982 event = smf_peek_next_event(smf);
985 g_critical("Trying to seek past the end of song.");
989 if (event->time_seconds < seconds)
990 smf_skip_next_event(smf);
995 smf->last_seek_position = seconds;
1001 * Seeks the SMF to the given position. For example, after seeking to 10 pulses,
1002 * smf_get_next_event will return first event that happens after the first ten pulses.
1005 smf_seek_to_pulses(smf_t *smf, int pulses)
1009 assert(pulses >= 0);
1014 g_debug("Seeking to %d pulses.", pulses);
1018 event = smf_peek_next_event(smf);
1020 if (event == NULL) {
1021 g_critical("Trying to seek past the end of song.");
1025 if (event->time_pulses < pulses)
1026 smf_skip_next_event(smf);
1031 smf->last_seek_position = event->time_seconds;
1037 * \return Length of SMF, in pulses.
1040 smf_get_length_pulses(const smf_t *smf)
1044 for (i = 1; i <= smf->number_of_tracks; i++) {
1048 track = smf_get_track_by_number(smf, i);
1051 event = smf_track_get_last_event(track);
1056 if (event->time_pulses > pulses)
1057 pulses = event->time_pulses;
1064 * \return Length of SMF, in seconds.
1067 smf_get_length_seconds(const smf_t *smf)
1070 double seconds = 0.0;
1072 for (i = 1; i <= smf->number_of_tracks; i++) {
1076 track = smf_get_track_by_number(smf, i);
1079 event = smf_track_get_last_event(track);
1084 if (event->time_seconds > seconds)
1085 seconds = event->time_seconds;
1092 * \return Nonzero, if there are no events in the SMF after this one.
1093 * Note that may be more than one "last event", if they occur at the same time.
1096 smf_event_is_last(const smf_event_t *event)
1098 if (smf_get_length_pulses(event->track->smf) <= event->time_pulses)
1105 * \return Version of libsmf.
1108 smf_get_version(void)
1110 return (SMF_VERSION);