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);
156 if (track->instrument) {
157 free (track->instrument);
160 memset(track, 0, sizeof(smf_track_t));
166 * Appends smf_track_t to smf.
169 smf_add_track(smf_t *smf, smf_track_t *track)
175 assert(track->smf == NULL);
178 g_ptr_array_add(smf->tracks_array, track);
180 smf->number_of_tracks++;
181 track->track_number = smf->number_of_tracks;
183 if (smf->number_of_tracks > 1) {
185 cantfail = smf_set_format(smf, 1);
188 smf_set_format(smf, 1);
195 * Detaches track from the smf.
198 smf_track_remove_from_smf(smf_track_t *track)
205 assert(track->smf != NULL);
207 track->smf->number_of_tracks--;
209 assert(track->smf->tracks_array);
210 g_ptr_array_remove(track->smf->tracks_array, track);
212 /* Renumber the rest of the tracks, so they are consecutively numbered. */
213 for (i = track->track_number; i <= track->smf->number_of_tracks; i++) {
214 tmp = smf_get_track_by_number(track->smf, i);
215 tmp->track_number = i;
218 * Events have track numbers too. I guess this wasn't a wise
221 for (j = 1; j <= tmp->number_of_events; j++) {
222 ev = smf_track_get_event_by_number(tmp, j);
223 ev->track_number = i;
227 track->track_number = -1;
232 * Allocates new smf_event_t structure. The caller is responsible for allocating
233 * event->midi_buffer, filling it with MIDI data and setting event->midi_buffer_length properly.
234 * Note that event->midi_buffer will be freed by smf_event_delete.
235 * \return pointer to smf_event_t or NULL.
240 smf_event_t *event = (smf_event_t*)malloc(sizeof(smf_event_t));
242 g_critical("Cannot allocate smf_event_t structure: %s", strerror(errno));
246 memset(event, 0, sizeof(smf_event_t));
248 event->delta_time_pulses = -1;
249 event->time_pulses = -1;
250 event->time_seconds = -1.0;
251 event->track_number = -1;
257 * Allocates an smf_event_t structure and fills it with "len" bytes copied
259 * \param midi_data Pointer to MIDI data. It sill be copied to the newly allocated event->midi_buffer.
260 * \param len Length of the buffer. It must be proper MIDI event length, e.g. 3 for Note On event.
261 * \return Event containing MIDI data or NULL.
264 smf_event_new_from_pointer(const void *midi_data, size_t len)
268 event = smf_event_new();
272 event->midi_buffer_length = len;
273 event->midi_buffer = (uint8_t*)malloc(event->midi_buffer_length);
274 if (event->midi_buffer == NULL) {
275 g_critical("Cannot allocate MIDI buffer structure: %s", strerror(errno));
276 smf_event_delete(event);
281 memcpy(event->midi_buffer, midi_data, len);
287 * Allocates an smf_event_t structure and fills it with at most three bytes of data.
288 * For example, if you need to create Note On event, do something like this:
290 * smf_event_new_from_bytes(0x90, 0x3C, 0x7f);
292 * To create event for MIDI message that is shorter than three bytes, do something
295 * smf_event_new_from_bytes(0xC0, 0x42, -1);
297 * \param first_byte First byte of MIDI message. Must be valid status byte.
298 * \param second_byte Second byte of MIDI message or -1, if message is one byte long.
299 * \param third_byte Third byte of MIDI message or -1, if message is two bytes long.
300 * \return Event containing MIDI data or NULL.
303 smf_event_new_from_bytes(int first_byte, int second_byte, int third_byte)
309 event = smf_event_new();
313 if (first_byte < 0) {
314 g_critical("First byte of MIDI message cannot be < 0");
315 smf_event_delete(event);
320 if (first_byte > 255) {
321 g_critical("smf_event_new_from_bytes: first byte is %d, which is larger than 255.", first_byte);
325 if (!is_status_byte(first_byte)) {
326 g_critical("smf_event_new_from_bytes: first byte is not a valid status byte.");
333 else if (third_byte < 0)
339 if (second_byte > 255) {
340 g_critical("smf_event_new_from_bytes: second byte is %d, which is larger than 255.", second_byte);
344 if (is_status_byte(second_byte)) {
345 g_critical("smf_event_new_from_bytes: second byte cannot be a status byte.");
351 if (third_byte > 255) {
352 g_critical("smf_event_new_from_bytes: third byte is %d, which is larger than 255.", third_byte);
356 if (is_status_byte(third_byte)) {
357 g_critical("smf_event_new_from_bytes: third byte cannot be a status byte.");
362 event->midi_buffer_length = len;
363 event->midi_buffer = (uint8_t*)malloc(event->midi_buffer_length);
364 if (event->midi_buffer == NULL) {
365 g_critical("Cannot allocate MIDI buffer structure: %s", strerror(errno));
366 smf_event_delete(event);
371 event->midi_buffer[0] = first_byte;
373 event->midi_buffer[1] = second_byte;
375 event->midi_buffer[2] = third_byte;
381 * Detaches event from its track and frees it.
384 smf_event_delete(smf_event_t *event)
386 if (event->track != NULL)
387 smf_event_remove_from_track(event);
389 if (event->midi_buffer != NULL) {
390 memset(event->midi_buffer, 0, event->midi_buffer_length);
391 free(event->midi_buffer);
394 memset(event, 0, sizeof(smf_event_t));
399 * Used for sorting track->events_array.
402 events_array_compare_function(gconstpointer aa, gconstpointer bb)
404 const smf_event_t *a, *b;
406 /* "The comparison function for g_ptr_array_sort() doesn't take the pointers
407 from the array as arguments, it takes pointers to the pointers in the array." */
408 a = (const smf_event_t *)*(const gpointer *)aa;
409 b = (const smf_event_t *)*(const gpointer *)bb;
411 if (a->time_pulses < b->time_pulses)
414 if (a->time_pulses > b->time_pulses)
418 * We need to preserve original order, otherwise things will break
419 * when there are several events with the same ->time_pulses.
420 * XXX: This is an ugly hack; we should remove sorting altogether.
423 if (a->event_number < b->event_number)
426 if (a->event_number > b->event_number)
433 * An assumption here is that if there is an EOT event, it will be at the end of the track.
436 remove_eot_if_before_pulses(smf_track_t *track, size_t pulses)
440 event = smf_track_get_last_event(track);
445 if (!smf_event_is_eot(event))
448 if (event->time_pulses > pulses)
451 smf_event_remove_from_track(event);
455 * Adds the event to the track and computes ->delta_pulses. Note that it is faster
456 * to append events to the end of the track than to insert them in the middle.
457 * Usually you want to use smf_track_add_event_seconds or smf_track_add_event_pulses
458 * instead of this one. Event needs to have ->time_pulses and ->time_seconds already set.
459 * If you try to add event after an EOT, EOT event will be automatically deleted.
462 smf_track_add_event(smf_track_t *track, smf_event_t *event)
464 size_t i, last_pulses = 0;
466 assert(track->smf != NULL);
467 assert(event->track == NULL);
468 assert(event->delta_time_pulses == -1);
469 assert(event->time_seconds >= 0.0);
471 remove_eot_if_before_pulses(track, event->time_pulses);
473 event->track = track;
474 event->track_number = track->track_number;
476 if (track->number_of_events == 0) {
477 assert(track->next_event_number == 0);
478 track->next_event_number = 1;
481 if (track->number_of_events > 0)
482 last_pulses = smf_track_get_last_event(track)->time_pulses;
484 track->number_of_events++;
486 /* Are we just appending element at the end of the track? */
487 if (last_pulses <= event->time_pulses) {
488 event->delta_time_pulses = event->time_pulses - last_pulses;
489 assert(event->delta_time_pulses >= 0);
490 g_ptr_array_add(track->events_array, event);
491 event->event_number = track->number_of_events;
493 /* We need to insert in the middle of the track. XXX: This is slow. */
495 /* Append, then sort according to ->time_pulses. */
496 g_ptr_array_add(track->events_array, event);
497 g_ptr_array_sort(track->events_array, events_array_compare_function);
499 /* Renumber entries and fix their ->delta_pulses. */
500 for (i = 1; i <= track->number_of_events; i++) {
501 smf_event_t *tmp = smf_track_get_event_by_number(track, i);
502 tmp->event_number = i;
504 if (tmp->delta_time_pulses != -1)
508 tmp->delta_time_pulses = tmp->time_pulses;
510 tmp->delta_time_pulses = tmp->time_pulses -
511 smf_track_get_event_by_number(track, i - 1)->time_pulses;
512 assert(tmp->delta_time_pulses >= 0);
516 /* Adjust ->delta_time_pulses of the next event. */
517 if (event->event_number < track->number_of_events) {
518 smf_event_t *next_event = smf_track_get_event_by_number(track, event->event_number + 1);
520 assert(next_event->time_pulses >= event->time_pulses);
521 next_event->delta_time_pulses -= event->delta_time_pulses;
522 assert(next_event->delta_time_pulses >= 0);
526 if (smf_event_is_tempo_change_or_time_signature(event)) {
527 if (smf_event_is_last(event))
528 maybe_add_to_tempo_map(event);
530 smf_create_tempo_map_and_compute_seconds(event->track->smf);
535 * Add End Of Track metaevent. Using it is optional, libsmf will automatically
536 * add EOT to the tracks during smf_save, with delta_pulses 0. If you try to add EOT
537 * in the middle of the track, it will fail and nonzero value will be returned.
538 * If you try to add EOT after another EOT event, it will be added, but the existing
539 * EOT event will be removed.
541 * \return 0 if everything went ok, nonzero otherwise.
544 smf_track_add_eot_delta_pulses(smf_track_t *track, uint32_t delta)
548 event = smf_event_new_from_bytes(0xFF, 0x2F, 0x00);
552 smf_track_add_event_delta_pulses(track, event, delta);
558 smf_track_add_eot_pulses(smf_track_t *track, size_t pulses)
560 smf_event_t *event, *last_event;
562 last_event = smf_track_get_last_event(track);
563 if (last_event != NULL) {
564 if (last_event->time_pulses > pulses)
568 event = smf_event_new_from_bytes(0xFF, 0x2F, 0x00);
572 smf_track_add_event_pulses(track, event, pulses);
578 smf_track_add_eot_seconds(smf_track_t *track, double seconds)
580 smf_event_t *event, *last_event;
582 last_event = smf_track_get_last_event(track);
583 if (last_event != NULL) {
584 if (last_event->time_seconds > seconds)
588 event = smf_event_new_from_bytes(0xFF, 0x2F, 0x00);
592 smf_track_add_event_seconds(track, event, seconds);
598 * Detaches event from its track.
601 smf_event_remove_from_track(smf_event_t *event)
608 assert(event->track != NULL);
609 assert(event->track->smf != NULL);
611 track = event->track;
612 was_last = smf_event_is_last(event);
614 /* Adjust ->delta_time_pulses of the next event. */
615 if (event->event_number < track->number_of_events) {
616 tmp = smf_track_get_event_by_number(track, event->event_number + 1);
618 tmp->delta_time_pulses += event->delta_time_pulses;
621 track->number_of_events--;
622 g_ptr_array_remove(track->events_array, event);
624 if (track->number_of_events == 0)
625 track->next_event_number = 0;
627 /* Renumber the rest of the events, so they are consecutively numbered. */
628 for (i = event->event_number; i <= track->number_of_events; i++) {
629 tmp = smf_track_get_event_by_number(track, i);
630 tmp->event_number = i;
633 if (smf_event_is_tempo_change_or_time_signature(event)) {
634 /* XXX: This will cause problems, when there is more than one Tempo Change event at a given time. */
636 remove_last_tempo_with_pulses(event->track->smf, event->time_pulses);
638 smf_create_tempo_map_and_compute_seconds(track->smf);
642 event->event_number = 0;
643 event->delta_time_pulses = -1;
644 event->time_pulses = 0;
645 event->time_seconds = -1.0;
649 * \return Nonzero if event is Tempo Change or Time Signature metaevent.
652 smf_event_is_tempo_change_or_time_signature(const smf_event_t *event)
654 if (!smf_event_is_metadata(event))
657 assert(event->midi_buffer_length >= 2);
659 if (event->midi_buffer[1] == 0x51 || event->midi_buffer[1] == 0x58)
666 * Sets "Format" field of MThd header to the specified value. Note that you
667 * don't really need to use this, as libsmf will automatically change format
668 * from 0 to 1 when you add the second track.
670 * \param format 0 for one track per file, 1 for several tracks per file.
673 smf_set_format(smf_t *smf, int format)
675 assert(format == 0 || format == 1);
677 if (smf->number_of_tracks > 1 && format == 0) {
678 g_critical("There is more than one track, cannot set format to 0.");
682 smf->format = format;
688 * Sets the PPQN ("Division") field of MThd header. This is mandatory, you
689 * should call it right after smf_new. Note that changing PPQN will change time_seconds
692 * \param ppqn New PPQN.
695 smf_set_ppqn(smf_t *smf, uint16_t ppqn)
703 * Returns next event from the track given and advances next event counter.
704 * Do not depend on End Of Track event being the last event on the track - it
705 * is possible that the track will not end with EOT if you haven't added it
706 * yet. EOTs are added automatically during smf_save().
708 * \return Event or NULL, if there are no more events left in this track.
711 smf_track_get_next_event(smf_track_t *track)
713 smf_event_t *event, *next_event;
715 /* Track is empty? */
716 if (track->number_of_events == 0)
720 if (track->next_event_number == 0)
723 assert(track->next_event_number >= 1);
725 event = smf_track_get_event_by_number(track, track->next_event_number);
727 assert(event != NULL);
729 /* Is this the last event in the track? */
730 if (track->next_event_number < track->number_of_events) {
731 next_event = smf_track_get_event_by_number(track, track->next_event_number + 1);
734 track->time_of_next_event = next_event->time_pulses;
735 track->next_event_number++;
737 track->next_event_number = 0;
744 * Returns next event from the track given. Does not change next event counter,
745 * so repeatedly calling this routine will return the same event.
746 * \return Event or NULL, if there are no more events left in this track.
749 smf_peek_next_event_from_track(smf_track_t *track)
754 if (track->next_event_number == 0)
757 assert(track->next_event_number >= 1);
758 assert(track->events_array->len != 0);
760 event = smf_track_get_event_by_number(track, track->next_event_number);
766 * \return Track with a given number or NULL, if there is no such track.
767 * Tracks are numbered consecutively starting from one.
770 smf_get_track_by_number(const smf_t *smf, int track_number)
774 assert(track_number >= 1);
776 if (track_number > smf->number_of_tracks)
779 track = (smf_track_t *)g_ptr_array_index(smf->tracks_array, track_number - 1);
787 * \return Event with a given number or NULL, if there is no such event.
788 * Events are numbered consecutively starting from one.
791 smf_track_get_event_by_number(const smf_track_t *track, size_t event_number)
795 assert(event_number >= 1);
797 if (event_number > track->number_of_events)
800 event = (smf_event_t*)g_ptr_array_index(track->events_array, event_number - 1);
808 * \return Last event on the track or NULL, if track is empty.
811 smf_track_get_last_event(const smf_track_t *track)
815 if (track->number_of_events == 0)
818 event = smf_track_get_event_by_number(track, track->number_of_events);
824 * Searches for track that contains next event, in time order. In other words,
825 * returns the track that contains event that should be played next.
826 * \return Track with next event or NULL, if there are no events left.
829 smf_find_track_with_next_event(smf_t *smf)
833 smf_track_t *track = NULL, *min_time_track = NULL;
835 /* Find track with event that should be played next. */
836 for (i = 1; i <= smf->number_of_tracks; i++) {
837 track = smf_get_track_by_number(smf, i);
841 /* No more events in this track? */
842 if (track->next_event_number == 0)
845 if (track->time_of_next_event < min_time || min_time_track == NULL) {
846 min_time = track->time_of_next_event;
847 min_time_track = track;
851 return (min_time_track);
855 * \return Next event, in time order, or NULL, if there are none left.
858 smf_get_next_event(smf_t *smf)
861 smf_track_t *track = smf_find_track_with_next_event(smf);
865 g_debug("End of the song.");
871 event = smf_track_get_next_event(track);
873 assert(event != NULL);
875 event->track->smf->last_seek_position = -1.0;
881 * Advance the "next event counter". This is functionally the same as calling
882 * smf_get_next_event and ignoring the return value.
885 smf_skip_next_event(smf_t *smf)
887 smf_event_t *ignored = smf_get_next_event(smf);
892 * \return Next event, in time order, or NULL, if there are none left. Does
893 * not advance position in song.
896 smf_peek_next_event(smf_t *smf)
899 smf_track_t *track = smf_find_track_with_next_event(smf);
903 g_debug("End of the song.");
909 event = smf_peek_next_event_from_track(track);
911 assert(event != NULL);
917 * Rewinds the SMF. What that means is, after calling this routine, smf_get_next_event
918 * will return first event in the song.
921 smf_rewind(smf_t *smf)
924 smf_track_t *track = NULL;
929 smf->last_seek_position = 0.0;
931 for (i = 1; i <= smf->number_of_tracks; i++) {
932 track = smf_get_track_by_number(smf, i);
934 assert(track != NULL);
936 if (track->number_of_events > 0) {
937 track->next_event_number = 1;
938 event = smf_peek_next_event_from_track(track);
940 track->time_of_next_event = event->time_pulses;
942 track->next_event_number = 0;
943 track->time_of_next_event = 0;
945 g_warning("Warning: empty track.");
952 * Seeks the SMF to the given event. After calling this routine, smf_get_next_event
953 * will return the event that was the second argument of this call.
956 smf_seek_to_event(smf_t *smf, const smf_event_t *target)
963 g_debug("Seeking to event %d, track %d.", target->event_number, target->track->track_number);
967 event = smf_peek_next_event(smf);
969 /* There can't be NULL here, unless "target" is not in this smf. */
973 smf_skip_next_event(smf);
978 smf->last_seek_position = event->time_seconds;
984 * Seeks the SMF to the given position. For example, after seeking to 1.0 seconds,
985 * smf_get_next_event will return first event that happens after the first second of song.
988 smf_seek_to_seconds(smf_t *smf, double seconds)
992 assert(seconds >= 0.0);
994 if (seconds == smf->last_seek_position) {
996 g_debug("Avoiding seek to %f seconds.", seconds);
1004 g_debug("Seeking to %f seconds.", seconds);
1008 event = smf_peek_next_event(smf);
1010 if (event == NULL) {
1011 g_critical("Trying to seek past the end of song.");
1015 if (event->time_seconds < seconds)
1016 smf_skip_next_event(smf);
1021 smf->last_seek_position = seconds;
1027 * Seeks the SMF to the given position. For example, after seeking to 10 pulses,
1028 * smf_get_next_event will return first event that happens after the first ten pulses.
1031 smf_seek_to_pulses(smf_t *smf, size_t pulses)
1038 g_debug("Seeking to %d pulses.", pulses);
1042 event = smf_peek_next_event(smf);
1044 if (event == NULL) {
1045 g_critical("Trying to seek past the end of song.");
1049 if (event->time_pulses < pulses)
1050 smf_skip_next_event(smf);
1055 smf->last_seek_position = event->time_seconds;
1061 * \return Length of SMF, in pulses.
1064 smf_get_length_pulses(const smf_t *smf)
1069 for (i = 1; i <= smf->number_of_tracks; i++) {
1073 track = smf_get_track_by_number(smf, i);
1076 event = smf_track_get_last_event(track);
1081 if (event->time_pulses > pulses)
1082 pulses = event->time_pulses;
1089 * \return Length of SMF, in seconds.
1092 smf_get_length_seconds(const smf_t *smf)
1095 double seconds = 0.0;
1097 for (i = 1; i <= smf->number_of_tracks; i++) {
1101 track = smf_get_track_by_number(smf, i);
1104 event = smf_track_get_last_event(track);
1109 if (event->time_seconds > seconds)
1110 seconds = event->time_seconds;
1117 * \return Nonzero, if there are no events in the SMF after this one.
1118 * Note that may be more than one "last event", if they occur at the same time.
1121 smf_event_is_last(const smf_event_t *event)
1123 if (smf_get_length_pulses(event->track->smf) <= event->time_pulses)
1130 * \return Version of libsmf.
1133 smf_get_version(void)
1135 return (SMF_VERSION);