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 #ifdef PLATFORM_WINDOWS
45 #include <arpa/inet.h>
48 #include "smf_private.h"
51 * Allocates new smf_t structure.
52 * \return pointer to smf_t or NULL.
59 smf_t *smf = (smf_t*)malloc(sizeof(smf_t));
61 g_critical("Cannot allocate smf_t structure: %s", strerror(errno));
65 memset(smf, 0, sizeof(smf_t));
67 smf->tracks_array = g_ptr_array_new();
68 assert(smf->tracks_array);
70 smf->tempo_array = g_ptr_array_new();
71 assert(smf->tempo_array);
73 cantfail = smf_set_ppqn(smf, 120);
76 cantfail = smf_set_format(smf, 0);
85 * Frees smf and all it's descendant structures.
88 smf_delete(smf_t *smf)
90 /* Remove all the tracks, from last to first. */
91 while (smf->tracks_array->len > 0)
92 smf_track_delete((smf_track_t*)g_ptr_array_index(smf->tracks_array, smf->tracks_array->len - 1));
96 assert(smf->tracks_array->len == 0);
97 assert(smf->number_of_tracks == 0);
98 g_ptr_array_free(smf->tracks_array, TRUE);
99 g_ptr_array_free(smf->tempo_array, TRUE);
101 memset(smf, 0, sizeof(smf_t));
106 * Allocates new smf_track_t structure.
107 * \return pointer to smf_track_t or NULL.
112 smf_track_t *track = (smf_track_t*)malloc(sizeof(smf_track_t));
114 g_critical("Cannot allocate smf_track_t structure: %s", strerror(errno));
118 memset(track, 0, sizeof(smf_track_t));
119 track->next_event_number = 0;
121 track->events_array = g_ptr_array_new();
122 assert(track->events_array);
128 * Detaches track from its smf and frees it.
131 smf_track_delete(smf_track_t *track)
134 assert(track->events_array);
136 /* Remove all the events */
138 for (i = 0; i < track->events_array->len; ++i) {
139 smf_event_t* ev = (smf_event_t*)g_ptr_array_index(track->events_array, i);
140 free (ev->midi_buffer);
144 g_ptr_array_remove_range(track->events_array, 0, track->events_array->len);
145 track->number_of_events = 0;
148 smf_track_remove_from_smf(track);
150 assert(track->events_array->len == 0);
151 g_ptr_array_free(track->events_array, TRUE);
153 memset(track, 0, sizeof(smf_track_t));
159 * Appends smf_track_t to smf.
162 smf_add_track(smf_t *smf, smf_track_t *track)
168 assert(track->smf == NULL);
171 g_ptr_array_add(smf->tracks_array, track);
173 smf->number_of_tracks++;
174 track->track_number = smf->number_of_tracks;
176 if (smf->number_of_tracks > 1) {
178 cantfail = smf_set_format(smf, 1);
181 smf_set_format(smf, 1);
188 * Detaches track from the smf.
191 smf_track_remove_from_smf(smf_track_t *track)
198 assert(track->smf != NULL);
200 track->smf->number_of_tracks--;
202 assert(track->smf->tracks_array);
203 g_ptr_array_remove(track->smf->tracks_array, track);
205 /* Renumber the rest of the tracks, so they are consecutively numbered. */
206 for (i = track->track_number; i <= track->smf->number_of_tracks; i++) {
207 tmp = smf_get_track_by_number(track->smf, i);
208 tmp->track_number = i;
211 * Events have track numbers too. I guess this wasn't a wise
214 for (j = 1; j <= tmp->number_of_events; j++) {
215 ev = smf_track_get_event_by_number(tmp, j);
216 ev->track_number = i;
220 track->track_number = -1;
225 * Allocates new smf_event_t structure. The caller is responsible for allocating
226 * event->midi_buffer, filling it with MIDI data and setting event->midi_buffer_length properly.
227 * Note that event->midi_buffer will be freed by smf_event_delete.
228 * \return pointer to smf_event_t or NULL.
233 smf_event_t *event = (smf_event_t*)malloc(sizeof(smf_event_t));
235 g_critical("Cannot allocate smf_event_t structure: %s", strerror(errno));
239 memset(event, 0, sizeof(smf_event_t));
241 event->delta_time_pulses = -1;
242 event->time_pulses = -1;
243 event->time_seconds = -1.0;
244 event->track_number = -1;
250 * Allocates an smf_event_t structure and fills it with "len" bytes copied
252 * \param midi_data Pointer to MIDI data. It sill be copied to the newly allocated event->midi_buffer.
253 * \param len Length of the buffer. It must be proper MIDI event length, e.g. 3 for Note On event.
254 * \return Event containing MIDI data or NULL.
257 smf_event_new_from_pointer(const void *midi_data, size_t len)
261 event = smf_event_new();
265 event->midi_buffer_length = len;
266 event->midi_buffer = (uint8_t*)malloc(event->midi_buffer_length);
267 if (event->midi_buffer == NULL) {
268 g_critical("Cannot allocate MIDI buffer structure: %s", strerror(errno));
269 smf_event_delete(event);
274 memcpy(event->midi_buffer, midi_data, len);
280 * Allocates an smf_event_t structure and fills it with at most three bytes of data.
281 * For example, if you need to create Note On event, do something like this:
283 * smf_event_new_from_bytes(0x90, 0x3C, 0x7f);
285 * To create event for MIDI message that is shorter than three bytes, do something
288 * smf_event_new_from_bytes(0xC0, 0x42, -1);
290 * \param first_byte First byte of MIDI message. Must be valid status byte.
291 * \param second_byte Second byte of MIDI message or -1, if message is one byte long.
292 * \param third_byte Third byte of MIDI message or -1, if message is two bytes long.
293 * \return Event containing MIDI data or NULL.
296 smf_event_new_from_bytes(int first_byte, int second_byte, int third_byte)
302 event = smf_event_new();
306 if (first_byte < 0) {
307 g_critical("First byte of MIDI message cannot be < 0");
308 smf_event_delete(event);
313 if (first_byte > 255) {
314 g_critical("smf_event_new_from_bytes: first byte is %d, which is larger than 255.", first_byte);
318 if (!is_status_byte(first_byte)) {
319 g_critical("smf_event_new_from_bytes: first byte is not a valid status byte.");
326 else if (third_byte < 0)
332 if (second_byte > 255) {
333 g_critical("smf_event_new_from_bytes: second byte is %d, which is larger than 255.", second_byte);
337 if (is_status_byte(second_byte)) {
338 g_critical("smf_event_new_from_bytes: second byte cannot be a status byte.");
344 if (third_byte > 255) {
345 g_critical("smf_event_new_from_bytes: third byte is %d, which is larger than 255.", third_byte);
349 if (is_status_byte(third_byte)) {
350 g_critical("smf_event_new_from_bytes: third byte cannot be a status byte.");
355 event->midi_buffer_length = len;
356 event->midi_buffer = (uint8_t*)malloc(event->midi_buffer_length);
357 if (event->midi_buffer == NULL) {
358 g_critical("Cannot allocate MIDI buffer structure: %s", strerror(errno));
359 smf_event_delete(event);
364 event->midi_buffer[0] = first_byte;
366 event->midi_buffer[1] = second_byte;
368 event->midi_buffer[2] = third_byte;
374 * Detaches event from its track and frees it.
377 smf_event_delete(smf_event_t *event)
379 if (event->track != NULL)
380 smf_event_remove_from_track(event);
382 if (event->midi_buffer != NULL) {
383 memset(event->midi_buffer, 0, event->midi_buffer_length);
384 free(event->midi_buffer);
387 memset(event, 0, sizeof(smf_event_t));
392 * Used for sorting track->events_array.
395 events_array_compare_function(gconstpointer aa, gconstpointer bb)
397 const smf_event_t *a, *b;
399 /* "The comparison function for g_ptr_array_sort() doesn't take the pointers
400 from the array as arguments, it takes pointers to the pointers in the array." */
401 a = (const smf_event_t *)*(const gpointer *)aa;
402 b = (const smf_event_t *)*(const gpointer *)bb;
404 if (a->time_pulses < b->time_pulses)
407 if (a->time_pulses > b->time_pulses)
411 * We need to preserve original order, otherwise things will break
412 * when there are several events with the same ->time_pulses.
413 * XXX: This is an ugly hack; we should remove sorting altogether.
416 if (a->event_number < b->event_number)
419 if (a->event_number > b->event_number)
426 * An assumption here is that if there is an EOT event, it will be at the end of the track.
429 remove_eot_if_before_pulses(smf_track_t *track, size_t pulses)
433 event = smf_track_get_last_event(track);
438 if (!smf_event_is_eot(event))
441 if (event->time_pulses > pulses)
444 smf_event_remove_from_track(event);
448 * Adds the event to the track and computes ->delta_pulses. Note that it is faster
449 * to append events to the end of the track than to insert them in the middle.
450 * Usually you want to use smf_track_add_event_seconds or smf_track_add_event_pulses
451 * instead of this one. Event needs to have ->time_pulses and ->time_seconds already set.
452 * If you try to add event after an EOT, EOT event will be automatically deleted.
455 smf_track_add_event(smf_track_t *track, smf_event_t *event)
457 size_t i, last_pulses = 0;
459 assert(track->smf != NULL);
460 assert(event->track == NULL);
461 assert(event->delta_time_pulses == -1);
462 assert(event->time_seconds >= 0.0);
464 remove_eot_if_before_pulses(track, event->time_pulses);
466 event->track = track;
467 event->track_number = track->track_number;
469 if (track->number_of_events == 0) {
470 assert(track->next_event_number == 0);
471 track->next_event_number = 1;
474 if (track->number_of_events > 0)
475 last_pulses = smf_track_get_last_event(track)->time_pulses;
477 track->number_of_events++;
479 /* Are we just appending element at the end of the track? */
480 if (last_pulses <= event->time_pulses) {
481 event->delta_time_pulses = event->time_pulses - last_pulses;
482 assert(event->delta_time_pulses >= 0);
483 g_ptr_array_add(track->events_array, event);
484 event->event_number = track->number_of_events;
486 /* We need to insert in the middle of the track. XXX: This is slow. */
488 /* Append, then sort according to ->time_pulses. */
489 g_ptr_array_add(track->events_array, event);
490 g_ptr_array_sort(track->events_array, events_array_compare_function);
492 /* Renumber entries and fix their ->delta_pulses. */
493 for (i = 1; i <= track->number_of_events; i++) {
494 smf_event_t *tmp = smf_track_get_event_by_number(track, i);
495 tmp->event_number = i;
497 if (tmp->delta_time_pulses != -1)
501 tmp->delta_time_pulses = tmp->time_pulses;
503 tmp->delta_time_pulses = tmp->time_pulses -
504 smf_track_get_event_by_number(track, i - 1)->time_pulses;
505 assert(tmp->delta_time_pulses >= 0);
509 /* Adjust ->delta_time_pulses of the next event. */
510 if (event->event_number < track->number_of_events) {
511 smf_event_t *next_event = smf_track_get_event_by_number(track, event->event_number + 1);
513 assert(next_event->time_pulses >= event->time_pulses);
514 next_event->delta_time_pulses -= event->delta_time_pulses;
515 assert(next_event->delta_time_pulses >= 0);
519 if (smf_event_is_tempo_change_or_time_signature(event)) {
520 if (smf_event_is_last(event))
521 maybe_add_to_tempo_map(event);
523 smf_create_tempo_map_and_compute_seconds(event->track->smf);
528 * Add End Of Track metaevent. Using it is optional, libsmf will automatically
529 * add EOT to the tracks during smf_save, with delta_pulses 0. If you try to add EOT
530 * in the middle of the track, it will fail and nonzero value will be returned.
531 * If you try to add EOT after another EOT event, it will be added, but the existing
532 * EOT event will be removed.
534 * \return 0 if everything went ok, nonzero otherwise.
537 smf_track_add_eot_delta_pulses(smf_track_t *track, uint32_t delta)
541 event = smf_event_new_from_bytes(0xFF, 0x2F, 0x00);
545 smf_track_add_event_delta_pulses(track, event, delta);
551 smf_track_add_eot_pulses(smf_track_t *track, size_t pulses)
553 smf_event_t *event, *last_event;
555 last_event = smf_track_get_last_event(track);
556 if (last_event != NULL) {
557 if (last_event->time_pulses > pulses)
561 event = smf_event_new_from_bytes(0xFF, 0x2F, 0x00);
565 smf_track_add_event_pulses(track, event, pulses);
571 smf_track_add_eot_seconds(smf_track_t *track, double seconds)
573 smf_event_t *event, *last_event;
575 last_event = smf_track_get_last_event(track);
576 if (last_event != NULL) {
577 if (last_event->time_seconds > seconds)
581 event = smf_event_new_from_bytes(0xFF, 0x2F, 0x00);
585 smf_track_add_event_seconds(track, event, seconds);
591 * Detaches event from its track.
594 smf_event_remove_from_track(smf_event_t *event)
601 assert(event->track != NULL);
602 assert(event->track->smf != NULL);
604 track = event->track;
605 was_last = smf_event_is_last(event);
607 /* Adjust ->delta_time_pulses of the next event. */
608 if (event->event_number < track->number_of_events) {
609 tmp = smf_track_get_event_by_number(track, event->event_number + 1);
611 tmp->delta_time_pulses += event->delta_time_pulses;
614 track->number_of_events--;
615 g_ptr_array_remove(track->events_array, event);
617 if (track->number_of_events == 0)
618 track->next_event_number = 0;
620 /* Renumber the rest of the events, so they are consecutively numbered. */
621 for (i = event->event_number; i <= track->number_of_events; i++) {
622 tmp = smf_track_get_event_by_number(track, i);
623 tmp->event_number = i;
626 if (smf_event_is_tempo_change_or_time_signature(event)) {
627 /* XXX: This will cause problems, when there is more than one Tempo Change event at a given time. */
629 remove_last_tempo_with_pulses(event->track->smf, event->time_pulses);
631 smf_create_tempo_map_and_compute_seconds(track->smf);
635 event->event_number = 0;
636 event->delta_time_pulses = -1;
637 event->time_pulses = 0;
638 event->time_seconds = -1.0;
642 * \return Nonzero if event is Tempo Change or Time Signature metaevent.
645 smf_event_is_tempo_change_or_time_signature(const smf_event_t *event)
647 if (!smf_event_is_metadata(event))
650 assert(event->midi_buffer_length >= 2);
652 if (event->midi_buffer[1] == 0x51 || event->midi_buffer[1] == 0x58)
659 * Sets "Format" field of MThd header to the specified value. Note that you
660 * don't really need to use this, as libsmf will automatically change format
661 * from 0 to 1 when you add the second track.
663 * \param format 0 for one track per file, 1 for several tracks per file.
666 smf_set_format(smf_t *smf, int format)
668 assert(format == 0 || format == 1);
670 if (smf->number_of_tracks > 1 && format == 0) {
671 g_critical("There is more than one track, cannot set format to 0.");
675 smf->format = format;
681 * Sets the PPQN ("Division") field of MThd header. This is mandatory, you
682 * should call it right after smf_new. Note that changing PPQN will change time_seconds
685 * \param ppqn New PPQN.
688 smf_set_ppqn(smf_t *smf, uint16_t ppqn)
696 * Returns next event from the track given and advances next event counter.
697 * Do not depend on End Of Track event being the last event on the track - it
698 * is possible that the track will not end with EOT if you haven't added it
699 * yet. EOTs are added automatically during smf_save().
701 * \return Event or NULL, if there are no more events left in this track.
704 smf_track_get_next_event(smf_track_t *track)
706 smf_event_t *event, *next_event;
708 /* Track is empty? */
709 if (track->number_of_events == 0)
713 if (track->next_event_number == 0)
716 assert(track->next_event_number >= 1);
718 event = smf_track_get_event_by_number(track, track->next_event_number);
720 assert(event != NULL);
722 /* Is this the last event in the track? */
723 if (track->next_event_number < track->number_of_events) {
724 next_event = smf_track_get_event_by_number(track, track->next_event_number + 1);
727 track->time_of_next_event = next_event->time_pulses;
728 track->next_event_number++;
730 track->next_event_number = 0;
737 * Returns next event from the track given. Does not change next event counter,
738 * so repeatedly calling this routine will return the same event.
739 * \return Event or NULL, if there are no more events left in this track.
742 smf_peek_next_event_from_track(smf_track_t *track)
747 if (track->next_event_number == 0)
750 assert(track->next_event_number >= 1);
751 assert(track->events_array->len != 0);
753 event = smf_track_get_event_by_number(track, track->next_event_number);
759 * \return Track with a given number or NULL, if there is no such track.
760 * Tracks are numbered consecutively starting from one.
763 smf_get_track_by_number(const smf_t *smf, int track_number)
767 assert(track_number >= 1);
769 if (track_number > smf->number_of_tracks)
772 track = (smf_track_t *)g_ptr_array_index(smf->tracks_array, track_number - 1);
780 * \return Event with a given number or NULL, if there is no such event.
781 * Events are numbered consecutively starting from one.
784 smf_track_get_event_by_number(const smf_track_t *track, size_t event_number)
788 assert(event_number >= 1);
790 if (event_number > track->number_of_events)
793 event = (smf_event_t*)g_ptr_array_index(track->events_array, event_number - 1);
801 * \return Last event on the track or NULL, if track is empty.
804 smf_track_get_last_event(const smf_track_t *track)
808 if (track->number_of_events == 0)
811 event = smf_track_get_event_by_number(track, track->number_of_events);
817 * Searches for track that contains next event, in time order. In other words,
818 * returns the track that contains event that should be played next.
819 * \return Track with next event or NULL, if there are no events left.
822 smf_find_track_with_next_event(smf_t *smf)
826 smf_track_t *track = NULL, *min_time_track = NULL;
828 /* Find track with event that should be played next. */
829 for (i = 1; i <= smf->number_of_tracks; i++) {
830 track = smf_get_track_by_number(smf, i);
834 /* No more events in this track? */
835 if (track->next_event_number == 0)
838 if (track->time_of_next_event < min_time || min_time_track == NULL) {
839 min_time = track->time_of_next_event;
840 min_time_track = track;
844 return (min_time_track);
848 * \return Next event, in time order, or NULL, if there are none left.
851 smf_get_next_event(smf_t *smf)
854 smf_track_t *track = smf_find_track_with_next_event(smf);
858 g_debug("End of the song.");
864 event = smf_track_get_next_event(track);
866 assert(event != NULL);
868 event->track->smf->last_seek_position = -1.0;
874 * Advance the "next event counter". This is functionally the same as calling
875 * smf_get_next_event and ignoring the return value.
878 smf_skip_next_event(smf_t *smf)
880 smf_event_t *ignored = smf_get_next_event(smf);
885 * \return Next event, in time order, or NULL, if there are none left. Does
886 * not advance position in song.
889 smf_peek_next_event(smf_t *smf)
892 smf_track_t *track = smf_find_track_with_next_event(smf);
896 g_debug("End of the song.");
902 event = smf_peek_next_event_from_track(track);
904 assert(event != NULL);
910 * Rewinds the SMF. What that means is, after calling this routine, smf_get_next_event
911 * will return first event in the song.
914 smf_rewind(smf_t *smf)
917 smf_track_t *track = NULL;
922 smf->last_seek_position = 0.0;
924 for (i = 1; i <= smf->number_of_tracks; i++) {
925 track = smf_get_track_by_number(smf, i);
927 assert(track != NULL);
929 if (track->number_of_events > 0) {
930 track->next_event_number = 1;
931 event = smf_peek_next_event_from_track(track);
933 track->time_of_next_event = event->time_pulses;
935 track->next_event_number = 0;
936 track->time_of_next_event = 0;
938 g_warning("Warning: empty track.");
945 * Seeks the SMF to the given event. After calling this routine, smf_get_next_event
946 * will return the event that was the second argument of this call.
949 smf_seek_to_event(smf_t *smf, const smf_event_t *target)
956 g_debug("Seeking to event %d, track %d.", target->event_number, target->track->track_number);
960 event = smf_peek_next_event(smf);
962 /* There can't be NULL here, unless "target" is not in this smf. */
966 smf_skip_next_event(smf);
971 smf->last_seek_position = event->time_seconds;
977 * Seeks the SMF to the given position. For example, after seeking to 1.0 seconds,
978 * smf_get_next_event will return first event that happens after the first second of song.
981 smf_seek_to_seconds(smf_t *smf, double seconds)
985 assert(seconds >= 0.0);
987 if (seconds == smf->last_seek_position) {
989 g_debug("Avoiding seek to %f seconds.", seconds);
997 g_debug("Seeking to %f seconds.", seconds);
1001 event = smf_peek_next_event(smf);
1003 if (event == NULL) {
1004 g_critical("Trying to seek past the end of song.");
1008 if (event->time_seconds < seconds)
1009 smf_skip_next_event(smf);
1014 smf->last_seek_position = seconds;
1020 * Seeks the SMF to the given position. For example, after seeking to 10 pulses,
1021 * smf_get_next_event will return first event that happens after the first ten pulses.
1024 smf_seek_to_pulses(smf_t *smf, size_t pulses)
1031 g_debug("Seeking to %d pulses.", pulses);
1035 event = smf_peek_next_event(smf);
1037 if (event == NULL) {
1038 g_critical("Trying to seek past the end of song.");
1042 if (event->time_pulses < pulses)
1043 smf_skip_next_event(smf);
1048 smf->last_seek_position = event->time_seconds;
1054 * \return Length of SMF, in pulses.
1057 smf_get_length_pulses(const smf_t *smf)
1062 for (i = 1; i <= smf->number_of_tracks; i++) {
1066 track = smf_get_track_by_number(smf, i);
1069 event = smf_track_get_last_event(track);
1074 if (event->time_pulses > pulses)
1075 pulses = event->time_pulses;
1082 * \return Length of SMF, in seconds.
1085 smf_get_length_seconds(const smf_t *smf)
1088 double seconds = 0.0;
1090 for (i = 1; i <= smf->number_of_tracks; i++) {
1094 track = smf_get_track_by_number(smf, i);
1097 event = smf_track_get_last_event(track);
1102 if (event->time_seconds > seconds)
1103 seconds = event->time_seconds;
1110 * \return Nonzero, if there are no events in the SMF after this one.
1111 * Note that may be more than one "last event", if they occur at the same time.
1114 smf_event_is_last(const smf_event_t *event)
1116 if (smf_get_length_pulses(event->track->smf) <= event->time_pulses)
1123 * \return Version of libsmf.
1126 smf_get_version(void)
1128 return (SMF_VERSION);