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 */
137 for (unsigned int i=0; i < track->events_array->len; ++i) {
138 smf_event_t* ev = g_ptr_array_index(track->events_array, i);
139 free (ev->midi_buffer);
143 g_ptr_array_remove_range(track->events_array, 0, track->events_array->len);
144 track->number_of_events = 0;
147 smf_track_remove_from_smf(track);
149 assert(track->events_array->len == 0);
150 g_ptr_array_free(track->events_array, TRUE);
152 memset(track, 0, sizeof(smf_track_t));
158 * Appends smf_track_t to smf.
161 smf_add_track(smf_t *smf, smf_track_t *track)
167 assert(track->smf == NULL);
170 g_ptr_array_add(smf->tracks_array, track);
172 smf->number_of_tracks++;
173 track->track_number = smf->number_of_tracks;
175 if (smf->number_of_tracks > 1) {
177 cantfail = smf_set_format(smf, 1);
180 smf_set_format(smf, 1);
187 * Detaches track from the smf.
190 smf_track_remove_from_smf(smf_track_t *track)
197 assert(track->smf != NULL);
199 track->smf->number_of_tracks--;
201 assert(track->smf->tracks_array);
202 g_ptr_array_remove(track->smf->tracks_array, track);
204 /* Renumber the rest of the tracks, so they are consecutively numbered. */
205 for (i = track->track_number; i <= track->smf->number_of_tracks; i++) {
206 tmp = smf_get_track_by_number(track->smf, i);
207 tmp->track_number = i;
210 * Events have track numbers too. I guess this wasn't a wise
213 for (j = 1; j <= tmp->number_of_events; j++) {
214 ev = smf_track_get_event_by_number(tmp, j);
215 ev->track_number = i;
219 track->track_number = -1;
224 * Allocates new smf_event_t structure. The caller is responsible for allocating
225 * event->midi_buffer, filling it with MIDI data and setting event->midi_buffer_length properly.
226 * Note that event->midi_buffer will be freed by smf_event_delete.
227 * \return pointer to smf_event_t or NULL.
232 smf_event_t *event = (smf_event_t*)malloc(sizeof(smf_event_t));
234 g_critical("Cannot allocate smf_event_t structure: %s", strerror(errno));
238 memset(event, 0, sizeof(smf_event_t));
240 event->delta_time_pulses = -1;
241 event->time_pulses = -1;
242 event->time_seconds = -1.0;
243 event->track_number = -1;
249 * Allocates an smf_event_t structure and fills it with "len" bytes copied
251 * \param midi_data Pointer to MIDI data. It sill be copied to the newly allocated event->midi_buffer.
252 * \param len Length of the buffer. It must be proper MIDI event length, e.g. 3 for Note On event.
253 * \return Event containing MIDI data or NULL.
256 smf_event_new_from_pointer(const void *midi_data, size_t len)
260 event = smf_event_new();
264 event->midi_buffer_length = len;
265 event->midi_buffer = (uint8_t*)malloc(event->midi_buffer_length);
266 if (event->midi_buffer == NULL) {
267 g_critical("Cannot allocate MIDI buffer structure: %s", strerror(errno));
268 smf_event_delete(event);
273 memcpy(event->midi_buffer, midi_data, len);
279 * Allocates an smf_event_t structure and fills it with at most three bytes of data.
280 * For example, if you need to create Note On event, do something like this:
282 * smf_event_new_from_bytes(0x90, 0x3C, 0x7f);
284 * To create event for MIDI message that is shorter than three bytes, do something
287 * smf_event_new_from_bytes(0xC0, 0x42, -1);
289 * \param first_byte First byte of MIDI message. Must be valid status byte.
290 * \param second_byte Second byte of MIDI message or -1, if message is one byte long.
291 * \param third_byte Third byte of MIDI message or -1, if message is two bytes long.
292 * \return Event containing MIDI data or NULL.
295 smf_event_new_from_bytes(int first_byte, int second_byte, int third_byte)
301 event = smf_event_new();
305 if (first_byte < 0) {
306 g_critical("First byte of MIDI message cannot be < 0");
307 smf_event_delete(event);
312 if (first_byte > 255) {
313 g_critical("smf_event_new_from_bytes: first byte is %d, which is larger than 255.", first_byte);
317 if (!is_status_byte(first_byte)) {
318 g_critical("smf_event_new_from_bytes: first byte is not a valid status byte.");
325 else if (third_byte < 0)
331 if (second_byte > 255) {
332 g_critical("smf_event_new_from_bytes: second byte is %d, which is larger than 255.", second_byte);
336 if (is_status_byte(second_byte)) {
337 g_critical("smf_event_new_from_bytes: second byte cannot be a status byte.");
343 if (third_byte > 255) {
344 g_critical("smf_event_new_from_bytes: third byte is %d, which is larger than 255.", third_byte);
348 if (is_status_byte(third_byte)) {
349 g_critical("smf_event_new_from_bytes: third byte cannot be a status byte.");
354 event->midi_buffer_length = len;
355 event->midi_buffer = (uint8_t*)malloc(event->midi_buffer_length);
356 if (event->midi_buffer == NULL) {
357 g_critical("Cannot allocate MIDI buffer structure: %s", strerror(errno));
358 smf_event_delete(event);
363 event->midi_buffer[0] = first_byte;
365 event->midi_buffer[1] = second_byte;
367 event->midi_buffer[2] = third_byte;
373 * Detaches event from its track and frees it.
376 smf_event_delete(smf_event_t *event)
378 if (event->track != NULL)
379 smf_event_remove_from_track(event);
381 if (event->midi_buffer != NULL) {
382 memset(event->midi_buffer, 0, event->midi_buffer_length);
383 free(event->midi_buffer);
386 memset(event, 0, sizeof(smf_event_t));
391 * Used for sorting track->events_array.
394 events_array_compare_function(gconstpointer aa, gconstpointer bb)
396 const smf_event_t *a, *b;
398 /* "The comparison function for g_ptr_array_sort() doesn't take the pointers
399 from the array as arguments, it takes pointers to the pointers in the array." */
400 a = (const smf_event_t *)*(const gpointer *)aa;
401 b = (const smf_event_t *)*(const gpointer *)bb;
403 if (a->time_pulses < b->time_pulses)
406 if (a->time_pulses > b->time_pulses)
410 * We need to preserve original order, otherwise things will break
411 * when there are several events with the same ->time_pulses.
412 * XXX: This is an ugly hack; we should remove sorting altogether.
415 if (a->event_number < b->event_number)
418 if (a->event_number > b->event_number)
425 * An assumption here is that if there is an EOT event, it will be at the end of the track.
428 remove_eot_if_before_pulses(smf_track_t *track, size_t pulses)
432 event = smf_track_get_last_event(track);
437 if (!smf_event_is_eot(event))
440 if (event->time_pulses > pulses)
443 smf_event_remove_from_track(event);
447 * Adds the event to the track and computes ->delta_pulses. Note that it is faster
448 * to append events to the end of the track than to insert them in the middle.
449 * Usually you want to use smf_track_add_event_seconds or smf_track_add_event_pulses
450 * instead of this one. Event needs to have ->time_pulses and ->time_seconds already set.
451 * If you try to add event after an EOT, EOT event will be automatically deleted.
454 smf_track_add_event(smf_track_t *track, smf_event_t *event)
456 size_t i, last_pulses = 0;
458 assert(track->smf != NULL);
459 assert(event->track == NULL);
460 assert(event->delta_time_pulses == -1);
461 assert(event->time_seconds >= 0.0);
463 remove_eot_if_before_pulses(track, event->time_pulses);
465 event->track = track;
466 event->track_number = track->track_number;
468 if (track->number_of_events == 0) {
469 assert(track->next_event_number == 0);
470 track->next_event_number = 1;
473 if (track->number_of_events > 0)
474 last_pulses = smf_track_get_last_event(track)->time_pulses;
476 track->number_of_events++;
478 /* Are we just appending element at the end of the track? */
479 if (last_pulses <= event->time_pulses) {
480 event->delta_time_pulses = event->time_pulses - last_pulses;
481 assert(event->delta_time_pulses >= 0);
482 g_ptr_array_add(track->events_array, event);
483 event->event_number = track->number_of_events;
485 /* We need to insert in the middle of the track. XXX: This is slow. */
487 /* Append, then sort according to ->time_pulses. */
488 g_ptr_array_add(track->events_array, event);
489 g_ptr_array_sort(track->events_array, events_array_compare_function);
491 /* Renumber entries and fix their ->delta_pulses. */
492 for (i = 1; i <= track->number_of_events; i++) {
493 smf_event_t *tmp = smf_track_get_event_by_number(track, i);
494 tmp->event_number = i;
496 if (tmp->delta_time_pulses != -1)
500 tmp->delta_time_pulses = tmp->time_pulses;
502 tmp->delta_time_pulses = tmp->time_pulses -
503 smf_track_get_event_by_number(track, i - 1)->time_pulses;
504 assert(tmp->delta_time_pulses >= 0);
508 /* Adjust ->delta_time_pulses of the next event. */
509 if (event->event_number < track->number_of_events) {
510 smf_event_t *next_event = smf_track_get_event_by_number(track, event->event_number + 1);
512 assert(next_event->time_pulses >= event->time_pulses);
513 next_event->delta_time_pulses -= event->delta_time_pulses;
514 assert(next_event->delta_time_pulses >= 0);
518 if (smf_event_is_tempo_change_or_time_signature(event)) {
519 if (smf_event_is_last(event))
520 maybe_add_to_tempo_map(event);
522 smf_create_tempo_map_and_compute_seconds(event->track->smf);
527 * Add End Of Track metaevent. Using it is optional, libsmf will automatically
528 * add EOT to the tracks during smf_save, with delta_pulses 0. If you try to add EOT
529 * in the middle of the track, it will fail and nonzero value will be returned.
530 * If you try to add EOT after another EOT event, it will be added, but the existing
531 * EOT event will be removed.
533 * \return 0 if everything went ok, nonzero otherwise.
536 smf_track_add_eot_delta_pulses(smf_track_t *track, uint32_t delta)
540 event = smf_event_new_from_bytes(0xFF, 0x2F, 0x00);
544 smf_track_add_event_delta_pulses(track, event, delta);
550 smf_track_add_eot_pulses(smf_track_t *track, size_t pulses)
552 smf_event_t *event, *last_event;
554 last_event = smf_track_get_last_event(track);
555 if (last_event != NULL) {
556 if (last_event->time_pulses > pulses)
560 event = smf_event_new_from_bytes(0xFF, 0x2F, 0x00);
564 smf_track_add_event_pulses(track, event, pulses);
570 smf_track_add_eot_seconds(smf_track_t *track, double seconds)
572 smf_event_t *event, *last_event;
574 last_event = smf_track_get_last_event(track);
575 if (last_event != NULL) {
576 if (last_event->time_seconds > seconds)
580 event = smf_event_new_from_bytes(0xFF, 0x2F, 0x00);
584 smf_track_add_event_seconds(track, event, seconds);
590 * Detaches event from its track.
593 smf_event_remove_from_track(smf_event_t *event)
600 assert(event->track != NULL);
601 assert(event->track->smf != NULL);
603 track = event->track;
604 was_last = smf_event_is_last(event);
606 /* Adjust ->delta_time_pulses of the next event. */
607 if (event->event_number < track->number_of_events) {
608 tmp = smf_track_get_event_by_number(track, event->event_number + 1);
610 tmp->delta_time_pulses += event->delta_time_pulses;
613 track->number_of_events--;
614 g_ptr_array_remove(track->events_array, event);
616 if (track->number_of_events == 0)
617 track->next_event_number = 0;
619 /* Renumber the rest of the events, so they are consecutively numbered. */
620 for (i = event->event_number; i <= track->number_of_events; i++) {
621 tmp = smf_track_get_event_by_number(track, i);
622 tmp->event_number = i;
625 if (smf_event_is_tempo_change_or_time_signature(event)) {
626 /* XXX: This will cause problems, when there is more than one Tempo Change event at a given time. */
628 remove_last_tempo_with_pulses(event->track->smf, event->time_pulses);
630 smf_create_tempo_map_and_compute_seconds(track->smf);
634 event->event_number = 0;
635 event->delta_time_pulses = -1;
636 event->time_pulses = 0;
637 event->time_seconds = -1.0;
641 * \return Nonzero if event is Tempo Change or Time Signature metaevent.
644 smf_event_is_tempo_change_or_time_signature(const smf_event_t *event)
646 if (!smf_event_is_metadata(event))
649 assert(event->midi_buffer_length >= 2);
651 if (event->midi_buffer[1] == 0x51 || event->midi_buffer[1] == 0x58)
658 * Sets "Format" field of MThd header to the specified value. Note that you
659 * don't really need to use this, as libsmf will automatically change format
660 * from 0 to 1 when you add the second track.
662 * \param format 0 for one track per file, 1 for several tracks per file.
665 smf_set_format(smf_t *smf, int format)
667 assert(format == 0 || format == 1);
669 if (smf->number_of_tracks > 1 && format == 0) {
670 g_critical("There is more than one track, cannot set format to 0.");
674 smf->format = format;
680 * Sets the PPQN ("Division") field of MThd header. This is mandatory, you
681 * should call it right after smf_new. Note that changing PPQN will change time_seconds
684 * \param ppqn New PPQN.
687 smf_set_ppqn(smf_t *smf, uint16_t ppqn)
695 * Returns next event from the track given and advances next event counter.
696 * Do not depend on End Of Track event being the last event on the track - it
697 * is possible that the track will not end with EOT if you haven't added it
698 * yet. EOTs are added automatically during smf_save().
700 * \return Event or NULL, if there are no more events left in this track.
703 smf_track_get_next_event(smf_track_t *track)
705 smf_event_t *event, *next_event;
707 /* Track is empty? */
708 if (track->number_of_events == 0)
712 if (track->next_event_number == 0)
715 assert(track->next_event_number >= 1);
717 event = smf_track_get_event_by_number(track, track->next_event_number);
719 assert(event != NULL);
721 /* Is this the last event in the track? */
722 if (track->next_event_number < track->number_of_events) {
723 next_event = smf_track_get_event_by_number(track, track->next_event_number + 1);
726 track->time_of_next_event = next_event->time_pulses;
727 track->next_event_number++;
729 track->next_event_number = 0;
736 * Returns next event from the track given. Does not change next event counter,
737 * so repeatedly calling this routine will return the same event.
738 * \return Event or NULL, if there are no more events left in this track.
741 smf_peek_next_event_from_track(smf_track_t *track)
746 if (track->next_event_number == 0)
749 assert(track->next_event_number >= 1);
750 assert(track->events_array->len != 0);
752 event = smf_track_get_event_by_number(track, track->next_event_number);
758 * \return Track with a given number or NULL, if there is no such track.
759 * Tracks are numbered consecutively starting from one.
762 smf_get_track_by_number(const smf_t *smf, int track_number)
766 assert(track_number >= 1);
768 if (track_number > smf->number_of_tracks)
771 track = (smf_track_t *)g_ptr_array_index(smf->tracks_array, track_number - 1);
779 * \return Event with a given number or NULL, if there is no such event.
780 * Events are numbered consecutively starting from one.
783 smf_track_get_event_by_number(const smf_track_t *track, size_t event_number)
787 assert(event_number >= 1);
789 if (event_number > track->number_of_events)
792 event = (smf_event_t*)g_ptr_array_index(track->events_array, event_number - 1);
800 * \return Last event on the track or NULL, if track is empty.
803 smf_track_get_last_event(const smf_track_t *track)
807 if (track->number_of_events == 0)
810 event = smf_track_get_event_by_number(track, track->number_of_events);
816 * Searches for track that contains next event, in time order. In other words,
817 * returns the track that contains event that should be played next.
818 * \return Track with next event or NULL, if there are no events left.
821 smf_find_track_with_next_event(smf_t *smf)
825 smf_track_t *track = NULL, *min_time_track = NULL;
827 /* Find track with event that should be played next. */
828 for (i = 1; i <= smf->number_of_tracks; i++) {
829 track = smf_get_track_by_number(smf, i);
833 /* No more events in this track? */
834 if (track->next_event_number == 0)
837 if (track->time_of_next_event < min_time || min_time_track == NULL) {
838 min_time = track->time_of_next_event;
839 min_time_track = track;
843 return (min_time_track);
847 * \return Next event, in time order, or NULL, if there are none left.
850 smf_get_next_event(smf_t *smf)
853 smf_track_t *track = smf_find_track_with_next_event(smf);
857 g_debug("End of the song.");
863 event = smf_track_get_next_event(track);
865 assert(event != NULL);
867 event->track->smf->last_seek_position = -1.0;
873 * Advance the "next event counter". This is functionally the same as calling
874 * smf_get_next_event and ignoring the return value.
877 smf_skip_next_event(smf_t *smf)
879 smf_event_t *ignored = smf_get_next_event(smf);
884 * \return Next event, in time order, or NULL, if there are none left. Does
885 * not advance position in song.
888 smf_peek_next_event(smf_t *smf)
891 smf_track_t *track = smf_find_track_with_next_event(smf);
895 g_debug("End of the song.");
901 event = smf_peek_next_event_from_track(track);
903 assert(event != NULL);
909 * Rewinds the SMF. What that means is, after calling this routine, smf_get_next_event
910 * will return first event in the song.
913 smf_rewind(smf_t *smf)
916 smf_track_t *track = NULL;
921 smf->last_seek_position = 0.0;
923 for (i = 1; i <= smf->number_of_tracks; i++) {
924 track = smf_get_track_by_number(smf, i);
926 assert(track != NULL);
928 if (track->number_of_events > 0) {
929 track->next_event_number = 1;
930 event = smf_peek_next_event_from_track(track);
932 track->time_of_next_event = event->time_pulses;
934 track->next_event_number = 0;
935 track->time_of_next_event = 0;
937 g_warning("Warning: empty track.");
944 * Seeks the SMF to the given event. After calling this routine, smf_get_next_event
945 * will return the event that was the second argument of this call.
948 smf_seek_to_event(smf_t *smf, const smf_event_t *target)
955 g_debug("Seeking to event %d, track %d.", target->event_number, target->track->track_number);
959 event = smf_peek_next_event(smf);
961 /* There can't be NULL here, unless "target" is not in this smf. */
965 smf_skip_next_event(smf);
970 smf->last_seek_position = event->time_seconds;
976 * Seeks the SMF to the given position. For example, after seeking to 1.0 seconds,
977 * smf_get_next_event will return first event that happens after the first second of song.
980 smf_seek_to_seconds(smf_t *smf, double seconds)
984 assert(seconds >= 0.0);
986 if (seconds == smf->last_seek_position) {
988 g_debug("Avoiding seek to %f seconds.", seconds);
996 g_debug("Seeking to %f seconds.", seconds);
1000 event = smf_peek_next_event(smf);
1002 if (event == NULL) {
1003 g_critical("Trying to seek past the end of song.");
1007 if (event->time_seconds < seconds)
1008 smf_skip_next_event(smf);
1013 smf->last_seek_position = seconds;
1019 * Seeks the SMF to the given position. For example, after seeking to 10 pulses,
1020 * smf_get_next_event will return first event that happens after the first ten pulses.
1023 smf_seek_to_pulses(smf_t *smf, size_t pulses)
1030 g_debug("Seeking to %d pulses.", pulses);
1034 event = smf_peek_next_event(smf);
1036 if (event == NULL) {
1037 g_critical("Trying to seek past the end of song.");
1041 if (event->time_pulses < pulses)
1042 smf_skip_next_event(smf);
1047 smf->last_seek_position = event->time_seconds;
1053 * \return Length of SMF, in pulses.
1056 smf_get_length_pulses(const smf_t *smf)
1061 for (i = 1; i <= smf->number_of_tracks; i++) {
1065 track = smf_get_track_by_number(smf, i);
1068 event = smf_track_get_last_event(track);
1073 if (event->time_pulses > pulses)
1074 pulses = event->time_pulses;
1081 * \return Length of SMF, in seconds.
1084 smf_get_length_seconds(const smf_t *smf)
1087 double seconds = 0.0;
1089 for (i = 1; i <= smf->number_of_tracks; i++) {
1093 track = smf_get_track_by_number(smf, i);
1096 event = smf_track_get_last_event(track);
1101 if (event->time_seconds > seconds)
1102 seconds = event->time_seconds;
1109 * \return Nonzero, if there are no events in the SMF after this one.
1110 * Note that may be more than one "last event", if they occur at the same time.
1113 smf_event_is_last(const smf_event_t *event)
1115 if (smf_get_length_pulses(event->track->smf) <= event->time_pulses)
1122 * \return Version of libsmf.
1125 smf_get_version(void)
1127 return (SMF_VERSION);