seq.h

   1 /*
   2 Calf Box, an open source musical instrument.
   3 Copyright (C) 2010-2011 Krzysztof Foltman
   4
   5 This program is free software: you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation, either version 3 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 */
  18
  19 #ifndef CBOX_SEQ_H
  20 #define CBOX_SEQ_H
  21
  22 #include <stdint.h>
  23
  24 #include "midi.h"
  25 #include "mididest.h"
  26
  27 struct cbox_engine;
  28 struct cbox_midi_pattern;
  29 struct cbox_track;
  30 struct cbox_song;
  31
  32 /////////////////////////////////////////////////////////////////////////////////////////////////////
  33
  34 struct cbox_midi_playback_active_notes
  35 {
  36     uint16_t channels_active;
  37     uint32_t notes[16][4]; // 0..127
  38 };
  39
  40 extern void cbox_midi_playback_active_notes_init(struct cbox_midi_playback_active_notes *notes);
  41 extern void cbox_midi_playback_active_notes_copy(struct cbox_midi_playback_active_notes *dest, const struct cbox_midi_playback_active_notes *src);
  42 extern void cbox_midi_playback_active_notes_clear(struct cbox_midi_playback_active_notes *notes);
  43 extern int cbox_midi_playback_active_notes_release(struct cbox_midi_playback_active_notes *notes, struct cbox_midi_buffer *buf);
  44
  45 /////////////////////////////////////////////////////////////////////////////////////////////////////
  46
  47 struct cbox_midi_pattern_playback
  48 {
  49     struct cbox_midi_event *events;
  50     int event_count;
  51 };
  52
  53 extern struct cbox_midi_pattern_playback *cbox_midi_pattern_playback_new(struct cbox_midi_pattern *pattern);
  54 extern void cbox_midi_pattern_playback_destroy(struct cbox_midi_pattern_playback *mppb);
  55
  56 /////////////////////////////////////////////////////////////////////////////////////////////////////
  57
  58 struct cbox_midi_clip_playback
  59 {
  60     struct cbox_midi_pattern_playback *pattern;
  61     struct cbox_master *master;
  62
  63     int pos;
  64     int rel_time_samples;
  65     // [start, end) of the pattern slice
  66     int start_time_samples, end_time_samples;
  67     int item_start_ppqn, min_time_ppqn;
  68     int offset_ppqn;
  69     struct cbox_midi_playback_active_notes *active_notes;
  70 };
  71
  72 extern void cbox_midi_clip_playback_init(struct cbox_midi_clip_playback *pb, struct cbox_midi_playback_active_notes *active_notes, struct cbox_master *master);
  73 extern void cbox_midi_clip_playback_render(struct cbox_midi_clip_playback *pb, struct cbox_midi_buffer *buf, int offset, int nsamples);
  74 extern void cbox_midi_clip_playback_seek_ppqn(struct cbox_midi_clip_playback *pb, int time_ppqn, int skip_this_pos);
  75 extern void cbox_midi_clip_playback_seek_samples(struct cbox_midi_clip_playback *pb, int time_samples);
  76 extern void cbox_midi_clip_playback_set_pattern(struct cbox_midi_clip_playback *pb, struct cbox_midi_pattern_playback *pattern, int start_time_samples, int end_time_samples, int item_start_ppqn, int offset_ppqn);
  77
  78 /////////////////////////////////////////////////////////////////////////////////////////////////////
  79
  80 // all times in this structure are in PPQN
  81 struct cbox_track_playback_item
  82 {
  83     uint32_t time;
  84     struct cbox_midi_pattern_playback *pattern;
  85     uint32_t offset;
  86     uint32_t length;
  87     // in future, it should also contain a pre-calculated list of notes to release
  88 };
  89
  90 struct cbox_track_playback
  91 {
  92     struct cbox_track *track; // used as identification only
  93     struct cbox_track_playback_item *items;
  94     struct cbox_master *master;
  95     int items_count;
  96     int pos;
  97     struct cbox_midi_buffer output_buffer;
  98     struct cbox_midi_clip_playback playback;
  99     struct cbox_midi_playback_active_notes active_notes;
 100     struct cbox_midi_merger *external_merger;
 101     struct cbox_song_playback *spb;
 102     struct cbox_track_playback *old_state;
 103     gboolean state_copied;
 104 };
 105
 106 extern struct cbox_track_playback *cbox_track_playback_new_from_track(struct cbox_track *track, struct cbox_master *master, struct cbox_song_playback *spb, struct cbox_track_playback *old_state);
 107 extern void cbox_track_playback_render(struct cbox_track_playback *pb, int offset, int nsamples);
 108 extern void cbox_track_playback_seek_ppqn(struct cbox_track_playback *pb, int time_ppqn, int min_time_ppqn);
 109 extern void cbox_track_playback_seek_samples(struct cbox_track_playback *pb, int time_samples);
 110 extern void cbox_track_playback_start_item(struct cbox_track_playback *pb, int time, int is_ppqn, int skip_this_pos);
 111 extern void cbox_track_playback_destroy(struct cbox_track_playback *pb);
 112
 113 /////////////////////////////////////////////////////////////////////////////////////////////////////
 114
 115 struct cbox_tempo_map_item
 116 {
 117     uint32_t time_ppqn;
 118     uint32_t time_samples;
 119     double tempo;
 120     int timesig_nom, timesig_denom;
 121     // should also have a bar/beat position to make things easier
 122 };
 123
 124 /////////////////////////////////////////////////////////////////////////////////////////////////////
 125
 126 struct cbox_adhoc_pattern
 127 {
 128     struct cbox_adhoc_pattern *next;
 129
 130     struct cbox_master *master;
 131     struct cbox_midi_pattern *pattern;
 132     struct cbox_midi_pattern_playback *pattern_playback;
 133
 134     struct cbox_midi_playback_active_notes active_notes;
 135     struct cbox_midi_clip_playback playback;
 136
 137     struct cbox_midi_buffer output_buffer;
 138     int id;
 139     gboolean completed;
 140 };
 141
 142 extern struct cbox_adhoc_pattern *cbox_adhoc_pattern_new(struct cbox_engine *engine, int id, struct cbox_midi_pattern *pattern);
 143 extern void cbox_adhoc_pattern_render(struct cbox_adhoc_pattern *adp, int offset, int nsamples);
 144 extern void cbox_adhoc_pattern_destroy(struct cbox_adhoc_pattern *ap);
 145
 146 /////////////////////////////////////////////////////////////////////////////////////////////////////
 147
 148 struct cbox_song_playback
 149 {
 150     struct cbox_master *master;
 151     struct cbox_song *song; // for identification only
 152     struct cbox_track_playback **tracks;
 153     int track_count;
 154     struct cbox_tempo_map_item *tempo_map_items;
 155     int tempo_map_item_count;
 156     int tempo_map_pos;
 157     uint32_t song_pos_samples, song_pos_ppqn, min_time_ppqn;
 158     uint32_t loop_start_ppqn, loop_end_ppqn;
 159     GHashTable *pattern_map;
 160     struct cbox_midi_merger track_merger;
 161     struct cbox_engine *engine;
 162 };
 163
 164 extern struct cbox_song_playback *cbox_song_playback_new(struct cbox_song *song, struct cbox_master *master, struct cbox_engine *engine, struct cbox_song_playback *old_state);
 165 extern void cbox_song_playback_render(struct cbox_song_playback *spb, struct cbox_midi_buffer *output, int nsamples);
 166 extern int cbox_song_playback_active_notes_release(struct cbox_song_playback *spb, struct cbox_midi_buffer *buf);
 167 extern void cbox_song_playback_seek_ppqn(struct cbox_song_playback *spb, int time_ppqn, int skip_this_pos);
 168 extern void cbox_song_playback_seek_samples(struct cbox_song_playback *spb, int time_samples);
 169 extern int cbox_song_playback_tmi_from_ppqn(struct cbox_song_playback *spb, int time_ppqn);
 170 extern int cbox_song_playback_tmi_from_samples(struct cbox_song_playback *spb, int time_samples);
 171 struct cbox_midi_pattern_playback *cbox_song_playback_get_pattern(struct cbox_song_playback *spb, struct cbox_midi_pattern *pattern);
 172 extern void cbox_song_playback_apply_old_state(struct cbox_song_playback *spb);
 173 extern void cbox_song_playback_destroy(struct cbox_song_playback *spb);
 174
 175 #endif